Poly plastisols

A type of physical stabili2ation process, unique for poly(vinyl chloride) resias, is the fusion of a dispersion of plastisol resia ia a plastici2er. The viscosity of a resia—plastici2er dispersioa shows a sharp iacrease at the fusioa temperature. Ia such a system expansioa can take place at a temperature corresponding to the low viscosity the temperature can then be raised to iacrease viscosity and stabili2e the expanded state. 

Poly(vinyl chloride) is used as a plastisol (dispersion with plasticizers), solution, or water dispersion. It is a good cement for pipes and is used extensively as an adhesive in automobiles. 

The first successful static firing of plastisol propellant took place late in 1950 as part of a broad program conducted by Atlantic Research Corp. to investigate and evaluate plastisol propellants and methods for their manufacture (16). Major attention was directed to poly (vinyl chloride), cellulose acetate, and nitrocellulose, although other polymers were tested for their suitability (17). Patent applications were filed for plastisol propellant compositions and manufacturing processes, based on poly(vinyl chloride) (PVC) (19) and on nitrocellulose (18). The commercial availability of dispersion grade PVC enabled work with this resin to advance rapidly. The balance of this paper is devoted to a discussion of PVC plastisol propellants and their manufacture. 

Krishnan T.K. Bose, Theoretical Performance of Poly (Vinyl Chloride) Plastisol Propellants, Comparative Study , JSpacecrRockets 1975, 12 (3), 187-89 CA 84, 33343 (1976)... 

The presence of a plasticizer in addition to the carboxylated polyester adversely affected the adhesion of some of the polymers—e.g., cellulose acetate butyrate and poly (vinyl chloride) plastisols. 

THERMAL DEGRADATION OF POLY(VINYL CHLORIDE) PLASTISOLS BASED ON LOW-MIGRATION POLYMERIC PLASTICIZERS... 

Polymer Engineering and Science 41, No.6, June 2001, p.998-1006 STRUCTURE AND PROPERTIES OF POLY (VINYL CHLORIDEj-TRIALLYL CYANURATE PLASTISOLS Homg-Jer Tai Taiwan,I-Shou University... 

The latexes upon which this industry developed were natural rubber and polychloroprene for solvent resistance. However, technology is advancing to permit penetration of carboxylated nitrile latex for optimized solvent resistance and tougher abrasion resistance. Among the competition to latexes in this field are poly(vinyl chloride) plastisols. As technology develops in producing small particle size latexes from polymers whose synthesis is loo water-sensitive for emulsion polymerization, the dipped goods industry will quickly convert to their utilization from the solvent-based cements of these polymers now employed Prime candidates include butyl rubber, EPDM, hypalon, and vlton. 

More recently (171) a two-component 100% solids prepolymer system, based on TDI and poly(oxypropylene) glycols, has been disclosed by Alva-Tech, Inc. This system can be run on a conventional urethane or vinyl plastisol casting line and has been suggested as a replacement for vinyl coatings for fabrics. 

Plastisols and organosols are a special case of physically drying coatings systems in which the binders consist of finely dispersed poly( vinyl chloride) or thermoplastic poly(meth)acrylates suspended in plasticizers. Organosols also contain some solvent. On drying at elevated temperatures, the polymer particles are swollen by the plasticizer, a process known as gelation. 

PVC plastisols, i.e., poly(vinyl chloride) dispersed in plasticizers, are used in special applications such as underseals for automobiles or as sealing compositions. 

Butyl diglycol acetate [124-17-4] [2-(2-butoxyethoxy)ethyl acetate] is a high boiler that is used as a temporary plasticizer, as a leveling agent in stoving enamels and in printing inks, as a film-forming auxiliary in acrylate copolymer dispersions, and to reduce the viscosity of poly(vinyl chloride) plastisols. 

Poly(vinyl chloride) is used in industry on a very large scale in many applications, such as rigid plastics, plastisols, and surface coatings. The monomer, vinyl chloride, can be prepared from acetylene ... 

Figure 10.43 shows that the temperatures to 50% loss of plasticizer tested alone and mixed with polymer are related to boiling temperature of plasticizer. The temperature of 50% plasticizer loss from the pure plasticizer is always slightly lower (e g., 9°C for DBF and 2°C for DIDP) than temperature to 50% weight loss of plastisol. It is difficult to understand reasons for the differences between various plasticizers but it is quite possible that the presence of poly-... 

Daraseal Poly(vinyl chloride) plastisols, PVC W R Grace... 

Vinyl chloride/vinylidene chloride monomers can be polymerized by emulsion pol3rmerization. Poly(vinyl chloride) (E-PVC) product is mostly applied as the dried form. It is spray-dried and milled to form fine powders ("crumbs") which is mixed with plasticizer to form a plastisol, i.e., dispersion of pol) vinyl chloride) particles in liquid organic media. The plastisol is poured into molds to make rubber doUs, shower curtains, embossed wall coverings and many of other common objects. In packing materials, especially for food packaging, the films of poly(vinylidene chloride) latexes are used, which are highly impermeable for both, oxygen and water vapor. 

According to Eq. (2.8) or (2.10) the concentration dependence of has two parameters, [rj and 0m- Both are measures of a specific physical quantity (respectively, shape and packing) and may be independently determined, for example, [rj] from viscosity of diluted suspensions and 0m from dry packing of solid particles. For anisometric particles, the magnitude of these parameters may also be theoretically predicted see the rheological summary in a quite recent monograph [64]. Once [rj] and 0m are known, Eq. (2.8) will correctly describe the rjr versus 0 dependence for complex industrial systems, for example, PVC (poly(vinyl chloride)) emulsions and plastisols, mica-reinforced polyolefins, and sealant formulations [44,65]. However, in some suspensions and blends, r] and 0m may vary with composition [66]. 

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