Letteratura scientifica selezionata sul tema "PVC PLASTISOL"
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "PVC PLASTISOL".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Articoli di riviste sul tema "PVC PLASTISOL"
1
Ji, Yubi, Heng Luo, Min Shi, Zhao Yang, Wei Gong e Hong Tan. "Study of the rheology and foaming processes of poly(vinyl chloride) plastisols with different foaming agents". Journal of Polymer Engineering 39, n. 2 (25 febbraio 2019): 117–23. http://dx.doi.org/10.1515/polyeng-2017-0447.
Testo completoAbstract (sommario):
AbstractPoly(vinyl chloride) (PVC) plastisols are widely used in the production of flexible PVC foams. In this study, we investigated the evolution of the complex viscosity of PVC plastisol by dynamic oscillatory tests, the storage modulus of the PVC compound by dynamic mechanical analysis, and the thermal behavior including the decomposition of three chemical blowing agents (CBAs), namely, azodicarbonamide, 4,4′-oxybis(benzenesulfonyl hydrazide), and sodium bicarbonate, by differential scanning calorimetry. Furthermore, the morphology and quality of the foams obtained from the corresponding plastisols were characterized by scanning electron microscopy. The results indicated that the onset decomposition temperature T2(5%) of a CBA in plastisol is the most critical indicator of the foam quality. The temperature difference corresponding to [T2(5%) – Tηmax] was also proved to be another important parameter. When T2(5%) is within the optimum temperature range of a PVC plastisol, the bigger the [T2(5%) – Tηmax] difference, the better the quality of the foams.
2
Makarewicz, Edwin, e Krzysztof Jan´czak. "The influence of organic diluents and solvents on the stability of PVC plastisol water dispersions". Polish Journal of Chemical Technology 9, n. 1 (1 gennaio 2007): 43–50. http://dx.doi.org/10.2478/v10026-007-0011-1.
Testo completoAbstract (sommario):
The influence of organic diluents and solvents on the stability of PVC plastisol water dispersions The work presents the research, the aim of which is to specify the influence of organic diluents and solvents such as xylene, toluene, n-butyl acetate and butanol as well as cyclohexanone on the stability of water dispersions of the PVC plastisol containing various surface-active agents (SAA). The applied surfactants were characterised by a specific ethoxylation number, molecular mass, the Hildebrand parameter, hydrophilic-hydrophobic balance, surface activity, the limiting viscosity number, the Haller interaction constant, the limiting equivalent conductivity and the Kohlrausch-Onsager equation "b" constant. Basing on the molar refraction and the Hildebrand parameter, the interactions between the plastisol constituents and the constituents of water dispersions of the PVC plastisol were established. The sedimentation tests on the PVC plastisol water dispersions stabilized by various surface-active agents with an organic diluent or solvent added indicated that the addition resulted in the dispergation yield, a reduction in the PVC plastisol molecular size in water dispersion and the increased Huggins interaction constant, showing both surface lyophilisation and higher adsorption of surface-active agents.
3
Nakajima, N., e E. R. Harrell. "Rheology of PVC Plastisol". Journal of Colloid and Interface Science 241, n. 2 (settembre 2001): 492–96. http://dx.doi.org/10.1006/jcis.2001.7733.
Testo completo
4
Nakajima, N., e E. R. Harrell. "Rheology of PVC Plastisol". Journal of Colloid and Interface Science 241, n. 2 (settembre 2001): 497–501. http://dx.doi.org/10.1006/jcis.2001.7734.
Testo completo
5
Marcilla, A., J. C. García, R. Ruiz, S. Sánchez, C. Vargas, L. Pita e M. I. Beltrán. "Rotational Moulding of PVC Plastisol". International Polymer Processing 20, n. 1 (marzo 2005): 47–54. http://dx.doi.org/10.3139/217.1869.
Testo completo
6
Plotnikova, G. V., K. L. Kuznetsov, V. A. Kuimov, N. A. Belogorlova, S. F. Malysheva, A. V. Rychkov e N. K. Gusarova. "NEW FLAME RETARDANT FOR PVC PLASTISOL". Proceedings of universities. Applied chemistry and biotechnology 6, n. 3 (2016): 100–106. http://dx.doi.org/10.21285/2227-2925-2016-6-3-100-106.
Testo completo
7
Nakajima, N. "Preparation of Foam from PVC Plastisol". International Polymer Processing 22, n. 4 (settembre 2007): 352–58. http://dx.doi.org/10.3139/217.1010.
Testo completo
8
Hemmrich, H. J. "Whither Now in PVC Plastisol Coatings?" Journal of Coated Fabrics 22, n. 3 (gennaio 1993): 178–87. http://dx.doi.org/10.1177/152808379302200302.
Testo completo
9
Marshall, Richard A. "Moisture absorption by PVC plastisol components". Journal of Vinyl and Additive Technology 12, n. 4 (dicembre 1990): 195–97. http://dx.doi.org/10.1002/vnl.730120403.
Testo completo
10
Савченко, Б. М., Н. В. Сова, Б. С. Дебелий, Р. Ш. Іскандаров, О. О. Слепцов e Т. А. Поліщук. "АДИТИВНЕ ФОРМУВАННЯ ЕЛАСТИЧНИХ ВИРОБІВ З ПВХ ПЛАСТИЗОЛЮ". Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 142, n. 1 (3 giugno 2020): 86–93. http://dx.doi.org/10.30857/1813-6796.2020.1.8.
Testo completoAbstract (sommario):
Development and testing of the technology of additive formation of elastic and soft products. The tensile strength and elongation at break for all the studied samples were determined according to ISO 527, the density of the samples according to PN-EN ISO 1183-1, the melt flow rate according to ISO 1133: 2005, the Shore A hardness according to ISO 868. The technology of additive manufacturing of soft and elastic products from liquid consumables has been created. The initial raw material for the formation of objects is the liquid composition of PVC, which can be transformed from the liquid state of plastisol to elastic plastic part or article. The created technology allows to create products of complex geometric shape with a hardness on the Shore scale of 5 to 90 units. The developed technology allows to create products from composite materials and foam based on PVC and can be implemented on equipment for FFF technology. The composition of the plastisol allows to adjust the hardness and elasticity of the products obtained over a wide range, the addition of pigments and dyes allows reach different colors. The developed technology has a higher forming speed rate than the FFF technology. A possible field of application is the manufacture of seals, soundproof materials, shock and vibration absorbers, design elements of clothing and shoes. The possibility of additive manufacturing of PVC plastisol on a fabric has been experimentally confirmed. The new features of the addition manufacturing of liquid PVC plastisol and properties of products obtained by the method are investigated. Product formation takes place through the process of simultaneously converting plastisol to molten plastic compound in an extruder. The method of additive manufacturing of products from liquid plastisol is developed, which allows to obtain products with low hardness and high elasticity. The developed technology allows the formation of products from composite materials and foams with the modernization of widely available equipment.
Tesi sul tema "PVC PLASTISOL"
1
Martin, Glyn. "The stabilisation of PVC plastisol using hydrotalcite (HT)". Thesis, Swansea University, 2007. https://cronfa.swan.ac.uk/Record/cronfa42522.
Testo completoAbstract (sommario):
The main focus of this EngD Thesis is an investigation into the use of Hydrotalcite (HT) as a photodegradation stabiliser for polyvinyl chloride (PVC) used as a coating for pre-finished steel. The work builds on the use of model systems, both unplasticised and plasticised, in comparing HT with other commercial stabilisers and culminates with the full formulation and testing of paint systems containing all the relevant commercial pigments and stabilisers. In the first section of work, a flat panel reactor was used to accurately measure the rates of photogenerated carbon dioxide (CO2) as an in-situ measurement of degradation. In unplasticised PVC pigmented with 30% photoactive titanium dioxide, there was a transition to a higher rate of CO2 evolution after a set amount of degradation which is attributed to the formation of hydrochloric acid. In this instance, the addition of up to 10% HT in model system removes this catalytic effect as the HT exchanges chloride ions for carbonate. This initial result suggested that HT could be a useful stabiliser and the results on model systems showed it to be far more consistent in its performance over a wide range of concentrations compared to commercial barium/zinc and tin based stabilisers. In model films containing plasticiser molecules based on phthalates the effect of HCl catalysis was not found to occur. An increase in initial rate of CO2 evolution and an absence of HCl production indicates preferential attack on the plasticiser rather than the PVC matrix. When more sulphonic acid ester (phthalate free) systems are used, acidic fragments and HCl are produced and these lead to a similar acceleration in degradation with UV exposure time observed with PVC alone. This indicated that in such systems the addition of a stabiliser that could remove hydrochloric acid would be beneficial. In near commercial PVC plastisol systems prepared on steel substrates, HT has been compared to historic (tin), existing (barium zinc) and future (calcium zinc) stabilisers. In all cases, regardless of titanium dioxide grade, the HT performed very well in terms of colour retention and gloss following QUVA weathering cycles with the HT preventing dehydrochlorination within the coating which leads to darkening on exposure. In the final section of work completely stabilised and fully formulated paint systems were prepared using the HT and commercial stabilisation systems and exposed to extended QUVA and QUVB cycles. Even in these systems the HT is demonstrated to perform consistently and is in almost all respects superior to existing stabilisation chemistries. The positive effects are shown for both white and coloured systems. In a summary, it seems that HT is able to stabilise PVC coatings applied to steel substrates and exposed to arduous weathering cycles. This stabilisation reflects the ability of HT to remove hydrochloric acid within the film which reduces dehydrochlorination, coating darkening and degradation. HT is a cheap mineral material and is extremely easy to blend into paint and as such is a potentially promising pigment addition to make to painted product to reduce acid catalysed degradation.
2
Buono, Michele. "Studio dell' omogeneizzazione e stabilità colore dei plastisol PVC". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25518/.
Testo completoAbstract (sommario):
L’esperienza di tirocinio svolta presso il laboratorio di Ricerca e Sviluppo dell’azienda Vulcaflex S.p.A. è stata finalizzata allo studio della dispersione di pigmenti organici e inorganici nel plastisol PVC. Il motivo di tale studio è dovuto principalmente al fatto che i clienti richiedono standard sempre più elevati e limitazioni sempre più stringenti per quanto riguarda il colore e la luminosità del materiale, spesso vicini ai limiti di rilevabilità strumentale. Per questo, in azienda si è deciso di approfondire lo studio della dispersione e omogeneizzazione del plastisol in ottica di ottimizzare e valorizzare ancor di più la produzione per ridurre gli scarti. Tale studio, perciò, è stato focalizzato sull'utilizzo di diversi tipi di additivi bagnanti e disperdenti, in modo da migliorare il più possibile le rese colore nel materiale finale. Si è deciso di elaborare delle prove di dispersione su scala di laboratorio il più possibile riproducibili e attendibili rispetto al processo industriale, in modo da valutare l’efficacia della dispersione dei pigmenti. Lo studio è centrato sull’utilizzo di due differenti tipologie di additivi bagnanti e disperdenti, e in particolare su due pigmenti rossi, uno inorganico e l’altro organico. Si è scelto di studiare solo questi due pigmenti in quanto il colore rosso risulta essere quello che causa maggiori problematiche in termini di tinta e luminosità del prodotto finale. Per quanto riguarda gli additivi bagnanti e disperdenti, si è studiato il loro effetto sulla resa colore andando a variare le percentuali aggiunte di questi ultimi.
Infine, per quanto riguarda i principali pigmenti studiati, si è valutato la stabilità dei pigmenti alla luce e al calore effettuando test di invecchiamento mediante lo Xeno test.
3
Abdesselam, Yamina. "Rhéologie des plastisols et leurs procédés d'enduction". Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM039/document.
Testo completoAbstract (sommario):
L’enduction à la racle est l’un des procédés utilisés pour la fabrication des revêtements de sol. Ce procédé consiste à enduire un substrat de plastisol - une suspension de particules de PVC et de charges minérales dans une phase liquide composée de plastifiant - à l’aide d’une racle fixée au-dessus d’un cylindre entraineur. Les sols type vinyle sont fabriqués par étapes successives d’enduction. Lors de l’enduction à la racle de certains plastisols, un défaut de goutte apparait.L’apparition de ces défauts et fortement dépendante de la nature du plastisol, de la géométrie de la racle et des paramètres procédés tels que la vitesse de ligne, l’entrefer entre la racle et le cylindre etc.Cette étude a tout d’abord pour but de déterminer la rhéologie de différentes formulations de plastisol, modèles et industrielles. L’influence de la taille et la distribution des particules de PVC ainsi que l’adjonction et la taille de charges minérales sur le comportement rhéologique est étudiée.Dans un second temps, une modélisation de l’écoulement est développée afin de calculer les taux de cisaillement rencontrés sous la racle, ainsi que le champ de vitesse et les forces exercées. Ce modèle rend possible l’étude de l’influence des paramètres procédés sur les conditions d’enduction.Une étude de l’influence de ces paramètres procédés sur l’apparition du défaut est alors entreprise, en utilisant une racle pilote, pour des formulations modèles et industrielles.Enfin, des corrélations sont établies, pour ces différentes formulations, entre les conditions d’apparition du défaut, la rhéologie du plastisol et les paramètres thermomécaniques de l’écoulement sous la racle. Différents mécanismes d’apparition des défauts sont proposésSpread coating is one of the processes used for the manufacturing of resilient floor coverings. It consists in shearing a plastisol, a suspension of PVC particles and mineral fillers in a liquid phase composed of plasticizer and adjuvants, between a fixed knife and a rotating roll supporting a substrate. Cushion floors are made through successive coating steps. Sometimes defects in the form of droplets appear on some of the successive layers.Defect appearance is strongly dependent on the plastisol nature, on the knife geometry and on the processing parameters such as roll velocity, gap between knife and roll, etc.The study first aims at determining the rheology of several plastisol formulations, model or industrial. The influence of PVC particle size and distribution and the addition and particle size of calcium carbonate filler on the rheological behaviour is studied.In a second step, a model of the flow behaviour is developed to highlight the range of shear rates encountered between the knife and the roll, as well as the velocity field and the coating force. This model then allows the investigation of the coater process parameters influence.Then, in a third step, an investigation of the processing parameters influence on the defect appearance is done using a pilot knife-over-roll coater, with both model and industrial pastes.Finally, correlations are established between defect appearance conditions, plastisol rheology and thermomechanical parameters of the flow between knife and roll for these different plastisol formulations. Different mechanisms of this defect development are proposed
4
Cook, John A. "Relationships between PVC plastisol rheology and partical size distribution for filled and unfilled systems". Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/6930.
Testo completoAbstract (sommario):
To control the rheological properties of PVC plastisols commercial manufacturers take great care to control the particle size (PS) and particle size distribution (PSD) of a polymer latex, as these exert a strong influence over the flow characteristics of an uncompounded plastisol. However, the fundamental mechanisms controlling viscosity are not clearly understood. Several techniques have been developed to measure the PSD (sedimentation analysis and laser diffraction) and viscosity over an extended shear rate range for plastisols prepared from carefully selected paste polymers. Care has been taken to establish the reliability of these techniques, as previous workers have experienced problems in obtaining reliable correlations from plastisol systems. Xany have failed to measure the PSD within the plastisols, incorrectly basing their observations on latex PSD. By careful selection of emulsion, seeded emulsion and microsuspension paste polymers the combined effects of polymerisation technique, emulsifier type, spray drying, milling and paste preparation on plastisol rheology have been established. For many applications plastisals contain mineral fillers, which have a similar PS to the paste polymers. Addition of these materials can drastically change plastisol rheology. Until now, it has been assumed that plastisol viscosity rises with filler content and depends on plasticiser absorbtion characteristics. To elucIdate the actual mechanism controlling the response of plastisols to fillers, calcium carbonate (coated and uncoated), titanium dioxide and Spheriglass filled systems have been studied. To establish a model which will allow paste polymer systems to be designed more accurately, the paste polymers used in the initial part of this study have been spray dried under widely differing conditions. Careful measurement of the rheology and PSD of filled and unfilled plastisols prepared from these materials has highlighted the effect of PS, PSD, paste polymer porosity and filler interaction on plastisol rheology. It has been clearly demonstrated that the plasticiser absorbtion characteristics of a filler are not the only factors controlling filled plastisol rheology, as previously thought. I have shown that the response of a plastisal to filler addition also depends on the interaction between filler PS and the paste polymer PSD.
5
Jaoua, Hend. "Enductions textiles barrières aux rayons IR : élaboration de nouvelles formulations de plastisols PVC". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1070.
Testo completoAbstract (sommario):
L'objectif de ce projet de recherche est la mise au point et l'utilisation de charges inorganiques barrière aux rayonnements infrarouge pour la préparation de matériaux d'enduction à base de plastisols PVC. Dans un premier temps, cette étude a été consacrée à la caractérisation rhéologique, morphologique et optique de la matrice PVC et à l'élaboration de nouvelles formulations, en incorporant dans le plastisol des charges commerciales de natures chimiques différentes (nacre, billes de verre, alumine, oxyde de Zinc, TiO2 …). Ensuite, des mesures radiatives sur des films de plastisols chargés à différents taux massiques ont été réalisées dans le but de sélectionner les charges présentant les meilleures performances optiques. Enfin, les formulations optimales ont été enduites sur un textile polyester et la stabilité des revêtements soumis à des rayonnements UV a été suivie par plusieurs techniques analytiques. Diverses caractérisations mécaniques, esthétiques et morphologiques sont venues compléter cette étude. Dans un second temps, un modèle de transfert radiatif permettant de simuler la propagation du rayonnement dans les systèmes de protection développés a été testéThis project aims to develop new filled PVC plastisol composite offering enhanced optical properties. Different types of inorganic fillers were tested and added to the PVC matrix. Rheological, morphological and optical characterization of the PVC matrix and development of new formulations by incorporation of different fillers (nacre, glass beads, alumina, zinc oxide, TiO2 ...) were the subject of the first phase of the project. Then, radiative measurements on plastisol films loaded at different mass ratios were performed in order to select the fillers having the best optical performance. The second phase was dedicated to the validation and the testing of the optimal formulations coated on polyester textile substrate. Different analytic technics were used in order to rank the UV stabilization as a function of the tested formulations. In addition, mechanical, aesthetic and morphological characterizations were used to complete this study. Finally, radiative transfer model was developed to simulate the radiative behavior of the different formulations
6
Bettio, Paola Pedroza Serpa de Biasi. "Obtenção e caracterização de nanocompósitos de poli(cloreto de vinila): plastisol com argila". Universidade Federal de São Carlos, 2011. https://repositorio.ufscar.br/handle/ufscar/880.
Testo completoAbstract (sommario):
Made available in DSpace on 2016-06-02T19:12:24Z (GMT). No. of bitstreams: 1
4607.pdf: 7698065 bytes, checksum: 3d54887483264be17c6178d965e9e897 (MD5)
Previous issue date: 2011-03-03This project aims to study the effect of adding nanoparticles in the plastisol of poly(vinyl chloride) microsuspension. The influence of two different types of nanoclay, sodium montmorillonite and organophilic montmorillonite modified with quaternary ammonium salt was evaluated, considering both the method of exfoliation of the clay and the influence of concentration. The nanoclay at a concentration of 2.5, 5 or 10 phr, was previously exfoliated in plasticizer, under the action of shear and temperature in kaule mixer. Three plasticizers were used, Diisobutyl phthalate, Diisononyl phthalate and ester polyglycolic. Experiments without the prior exfoliating clay, were also performed for validation of its influence. The plastisol was obtained by mixing the nanoclay with PVC, diisononyl phthalate plasticizer and other additives in planetary mixer. The focus of the study will be not only to investigate the influence of nanoparticles on the improvement of rheological properties, but the influence on the mechanical properties, expanding the application of this resin. As the resin obtained will be attending the main application market, the analysis will focus on characterization for this particular application. Data analysis was performed with the aid of statistical method. It was possible to affirm that type of clay and also its concentration have influence on the viscosity. The prior exfoliation of the clay was not proved to be effective. It was possible to affirm that type and concentration also have significant influence on the opacity of the spread coating. In relation to thermal stability, it was possible to observe reduction in the nanocomposites containing organophilic modified nanoclay. In relation to the mechanical proprieties, it was possible to affirm that only the concentration of the clay was significant to the result, as its increase resulted in a decrease of these properties, with the exception of the Young modulus.
Este projeto teve como objetivo estudar a influência de nanopartículas de argila no plastisol de poli(cloreto de vinila) microsuspensão. Foram utilizados dois tipos diferentes de nanoargila, montmorilonita sódica e montmorilonita organicamente modificada com sal quaternário de amônio, contemplando a avaliação tanto do método de esfoliação da argila, quanto da influência da concentração utilizada. A nanoargila, nas concentrações de 2, 4, ou 6 pcr, foi previamente inchada em plastificante, sob ação de cisalhamento e temperatura em misturador tipo kaule. Três tipos de plastificantes foram utilizados, Diisobutil Ftalato, Diisononil Ftalato e éster poliglicólico. Experimentos sem o esfoliamento prévio da argila, também foram realizados, para verificação de sua influência. O plastisol foi obtido com a mistura da nanoargila com o PVC, plastificante DINP e demais aditivos, em misturador planetário. O foco do estudo foi verificar além da influência da nanocarga nas melhorias das propriedades reológicas, a influência na melhoria das propriedades mecânicas, ampliando assim, o potencial de aplicação desta resina. Como a resina obtida tem como principal aplicação o atendimento do mercado de espalmados, as análises de caracterização escolhidas foram voltadas para esta aplicação específica. A análise dos dados foi feita com auxilio de método estatístico, tendo sido possível afirmar que tanto o tipo de argila, quanto sua concentração foram determinantes para elevação da viscosidade da pasta, não tendo sido comprovada eficácia no inchamento prévio da argila. Também foi possível afirmar que o tipo e a concentração de argila afetaram significantemente a opacidade do espalmado. Em relação a estabilidade térmica estática, confirmou-se sua redução nos nanocompósitos contendo argila organicamente modificada. Já em relação as resultados das propriedades mecânicas, foi possível constatar que o aumento do teor de argila resultou em redução das propriedades estudadas com exceção do módulo de Young.
7
Fajardie, Pauline. "Recycling of plasticized PVC by incorporation into plastisols : modeling of rheological behavior and study of compatibility". Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10238.
Testo completoAbstract (sommario):
Les problématiques environnementales actuelles concernant l’élimination des déchets plastiques encouragent les acteurs du marché du PVC à sortir du système linéaire en vigueur afin d’entrer dans un processus d’économie circulaire. Bien que les techniques de recyclage mécanique et chimique du PVC continuent de se développer, la valorisation des déchets de PVC plastifié par incorporation dans des plastisols reste peu considérée. Leur mise en œuvre repose en effet sur deux aspects rhéologiques fondamentaux, très sensibles à la présence de PVC recyclé plastifié. L’introduction de ce dernier dans les plastisols augmente en effet l’ampleur du phénomène de maturation, en entraînant une augmentation significative de la viscosité, et accélère le processus de gélification. Ces mécanismes sont gouvernés par la diffusion du plastifiant qui induit un gonflement des particules de PVC. Les coefficients de diffusion ont été déterminés au moyen d’une étude cinétique réalisée sur des systèmes modèles. Par ailleurs, le rôle de la température de transition vitreuse du PVC a été élucidé. Un modèle rhéologique a ensuite été développé afin de prédire les comportements de maturation et de gélification pour des plastisols contenant une fraction de PVC recyclé. Ce modèle est basé sur le comportement rhéologique de suspensions concentrées. Les effets de certains paramètres clés ont été analysés, notamment la quantité de PVC recyclé ainsi que sa granulométrie et sa concentration en plastifiant. D’autres expérimentations ont été réalisées en vue d’étudier la compatibilité entre le PVC recyclé et la matrice constituée de résine vierge plastifiée, particulièrement en ce qui concerne les performances mécaniques du matériau enduit. Les résultats montrent finalement qu’une telle procédure de recyclage requiert un compromis entre une augmentation tolérable de la viscosité du plastisol durant le stockage, liée à des contraintes industrielles, et la préservation des performances mécaniques du matériau gélifié. Une dernière série d’expériences a été effectuée sur des systèmes semi-industriels afin d’évaluer la faisabilité à plus grande échelle tout en proposant des recommandationsCurrent environmental issues regarding disposal of polymer wastes encourage PVC industry stakeholders to replace the linear economic system in force by a circular process. Mechanical and chemical techniques employed to recycle PVC materials are well-known but only little attention has been given to the reuse of plasticized PVC wastes by incorporation into plastisols, despite their industrial importance. Processing of the latter is indeed strongly dependent on rheology, widely affected by the addition of plasticized recycled PVC which tends to increase the extent of viscosity aging and to speed up the gelation process. These mechanisms being governed by diffusion of plasticizer which penetrates and swells PVC particles, a kinetic study conducted in the frame of model systems has been performed to determine diffusion coefficients. The glass transition temperature of PVC was proven to be of utmost importance. A model based on the rheology of concentrated suspensions was subsequently developed to predict the aging and gelation behavior of plastisols containing a recycled fraction. The effects of several key parameters, such as the quantity of recycled PVC as well as its particle size and plasticization level, have been examined. Further investigations have been conducted regarding the compatibility of recycled PVC with the matrix composed of plasticized virgin resin, with particular emphasis on the mechanical performance of the coated material. Results actually demonstrate that such a recycling procedure requires compromise between a bearable increase of plastisol viscosity during storage, to meet industrial constraints, and the preservation of mechanical performance after processing. A final series of experiments has been performed on semi-industrial systems to assess the feasibility at a larger scale and some recommendations are suggested
8
Chaty, Marc. "Procédé de surmoulage des vitrages par gélification haute-fréquence des PVC plastisols". Nancy 1, 1998. http://www.theses.fr/1998NAN10318.
Testo completoAbstract (sommario):
Ce travail concerne la réalisation des joints d'encapsulage des vitrages automobiles en PVC-plastisol que l'on gélifie dans une presse haute fréquence. On décrit une installation de laboratoire permettant de simuler la transformation des produits lorsqu'ils sont irradies par HF. Son utilisation, pour l'étude de la transformation, montre que la permittivité complexe du PVC-plastisol au cours de la gélification HF suit la même évolution que celle qui est observée au cours d'une gélification classique. Il est montre également que l'on peut construire un schéma électrique équivalent de la presse industrielle. La relation liant son impédance complexe et l'avancement de la transformation du matériau est donnée. La modélisation du procédé industriel est complétée par le calcul de la distribution du champ dans le moule ce qui offre la possibilité d'optimiser la forme des électrodes et d'étudier le cycle en vue d'une cuisson optimale.
9
Jaoua, Hend. "Enductions textiles barrières aux rayons IR : élaboration de nouvelles formulations de plastisols PVC". Electronic Thesis or Diss., Lyon, 2018. http://www.theses.fr/2018LYSE1070.
Testo completoAbstract (sommario):
L'objectif de ce projet de recherche est la mise au point et l'utilisation de charges inorganiques barrière aux rayonnements infrarouge pour la préparation de matériaux d'enduction à base de plastisols PVC. Dans un premier temps, cette étude a été consacrée à la caractérisation rhéologique, morphologique et optique de la matrice PVC et à l'élaboration de nouvelles formulations, en incorporant dans le plastisol des charges commerciales de natures chimiques différentes (nacre, billes de verre, alumine, oxyde de Zinc, TiO2 …). Ensuite, des mesures radiatives sur des films de plastisols chargés à différents taux massiques ont été réalisées dans le but de sélectionner les charges présentant les meilleures performances optiques. Enfin, les formulations optimales ont été enduites sur un textile polyester et la stabilité des revêtements soumis à des rayonnements UV a été suivie par plusieurs techniques analytiques. Diverses caractérisations mécaniques, esthétiques et morphologiques sont venues compléter cette étude. Dans un second temps, un modèle de transfert radiatif permettant de simuler la propagation du rayonnement dans les systèmes de protection développés a été testéThis project aims to develop new filled PVC plastisol composite offering enhanced optical properties. Different types of inorganic fillers were tested and added to the PVC matrix. Rheological, morphological and optical characterization of the PVC matrix and development of new formulations by incorporation of different fillers (nacre, glass beads, alumina, zinc oxide, TiO2 ...) were the subject of the first phase of the project. Then, radiative measurements on plastisol films loaded at different mass ratios were performed in order to select the fillers having the best optical performance. The second phase was dedicated to the validation and the testing of the optimal formulations coated on polyester textile substrate. Different analytic technics were used in order to rank the UV stabilization as a function of the tested formulations. In addition, mechanical, aesthetic and morphological characterizations were used to complete this study. Finally, radiative transfer model was developed to simulate the radiative behavior of the different formulations
10
Fenollar, Gimeno Octavio Ángel. "Utilización de plastificantes naturales para la obtención de PVC flexible de bajo impacto medioambiental". Doctoral thesis, Universitat Politècnica de València, 2011. http://hdl.handle.net/10251/11097.
Testo completoAbstract (sommario):
Durante los últimos años en el sector del PVC plastificado existe cierta controversia con la utilización de plastificantes tradicionales basados en ftalatos, y usados de manera generalizada en la industria. Pese a que no ha sido del todo demostrado, este tipo de plastificantes presentan un riesgo tóxico potencial en el caso de que puedan migrar hacia el medio con el que están en contacto. Ello ha provocado que se haya limitado la utilización de este tipo de plastificantes en sectores como el envasado para la alimentación o el sector del juguete, en el que el producto está en contacto directo con alimentos o con niños. Sin embargo, en estos sectores, la utilización de PVC plastificado resulta en la práctica imprescindible debido al balance de propiedades que presenta el material y a la especificidad de sus procesos de fabricación. Por este motivo se están llevando a cabo investigaciones con plastificantes alternativos libres de ftalatos.
Una de las líneas de investigación abiertas es la utilización de plastificantes de origen natural y de baja toxicidad. En esta tesis doctoral se han elegido tres plastificantes para PVC de origen natural y baja toxicidad: dos epoxiésteres de ácidos grasos y aceite de linaza epoxidado. El objetivo global de esta tesis doctoral es determinar si los plastificantes de origen natural son una alternativa real a los plastificantes tradicionales basados en ftalatos. Por ello, se han llevado a cabo una serie de análisis y ensayos para determinar la viabilidad de la utilización de este tipo de plastificante en la industria.
En primer lugar, se ha llevado a cabo una optimización de los parámetros de curado con el fin de determinar si dichas condiciones son compatibles con los procesos de fabricación actuales utilizados en la industria. Se ha escogido una cantidad de los distintos plastificantes de origen natural de 70 phr, siendo ésta una formulación utilizada habitualmente en la industria.Fenollar Gimeno, OÁ. (2011). Utilización de plastificantes naturales para la obtención de PVC flexible de bajo impacto medioambiental [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/11097
Palancia
Libri sul tema "PVC PLASTISOL"
1
Cook, John Alan. Relationships between PVC plastisol rheology and particle size distribution for filled and unfilled systems. 1987.
Cerca il testo completo
2
University, Loughborough, a cura di. Relationships between PVC plastisol rheology and partical size distribution for filled and unfilled systems. 1986.
Cerca il testo completo
4
Morton, Jones. Procesamiento de plasticos/ Polymer Processing: Inyeccion, moldero, hule y pvc. Limusa, 2006.
Cerca il testo completoCapitoli di libri sul tema "PVC PLASTISOL"
1
Mezroua, Abderrahmane, Michel H. Lefebvre, Djalal Trache e Kamel Khimeche. "Burning Rate of PVC—Plastisol Composite Propellants and Correlation Between Closed Vessel and Strand Burner Tests Data". In Innovative Energetic Materials: Properties, Combustion Performance and Application, 351–72. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4831-4_12.
Testo completo
2
Morton-Jones, D. H. "PVC and plastisols". In Polymer Processing, 242–53. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0815-4_14.
Testo completo
3
Flick, Ernest W. "Degussa: AEROSIL for PVC Plastisols". In Plastics Additives, 98. Elsevier, 2002. http://dx.doi.org/10.1016/b978-0-8155-1470-1.50025-0.
Testo completo
4
Flick, Ernest W. "BYK-Chemie USA: Air Release Additives for PVC Plastisols". In Plastics Additives, 113–15. Elsevier, 2002. http://dx.doi.org/10.1016/b978-0-8155-1470-1.50032-8.
Testo completoAtti di convegni sul tema "PVC PLASTISOL"
1
Macaluso, John. "PVC Micropellets Replace Drysols and Plastisols in Rotocasting Interior Automotive Applications". In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1996. http://dx.doi.org/10.4271/960709.
Testo completo
2
Hochstein, B., N. Willenbacher, Albert Co, Gary L. Leal, Ralph H. Colby e A. Jeffrey Giacomin. "Influence of Water Content on the Flow Behaviour of PVC-Plastisols". In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964838.
Testo completo
3
Ryder, David. "Processing of Double Base Propellants Using Plastisol Grade Nitrocellulose (PNC) Suspended in Heptane". In 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-4947.
Testo completo