Vinyl plastisols

There are two principal PVC resins for producing vinyl foams suspension resin and dispersion resin. The suspension resin is prepared by suspension polymerization with a relatively large particle size in the 30—250 p.m range and the dispersion resin is prepared by emulsion polymerization with a fine particle size in the 0.2—2 p.m range (245). The latter is used in the manufacture of vinyl plastisols which can be fused without the appHcation of pressure. In addition, plastisol blending resins, which are fine particle size suspension resins, can be used as a partial replacement for the dispersion resin in a plastisol system to reduce the resin costs. 

The Kleber-Colombes rigid PVC foam (253,254) is produced by compression mol ding vinyl plastisol to react and gel the compound, followed by steam expansion. The process involves mixing, mol ding, and expansion. The formulation consists of PVC, isocyanate, vinyl monomers such as styrene, anhydrides such as maleic anhydride, polymerization initiators, FC-11, and nucleators. The ingredients are mixed in a Wemer-Pfleiderer or a Baker Perkins... 

For vinyl plastisol, organosol products and calendering, Day-Glo Color Corp. offers T, D, VC, and AX-Series pigments, Lawter Chemical offers the B-3500 and G-3000 Series, and Radiant Color offers P-1600 and R-203-G Series. In addition, Day-Glo offers VC Series for vinyl calendering where nonformaldehyde products are needed. 

Thermoplastic coatings based on vinyl plastisols and acryUc latexes resist severe deformation duting fabrication and exhibit good exterior durabdity. 

Crespo JE, Balart R, Sanchez L, Lopez J (2007) Substitution of di(2-ethylhexyl) phthalate by di(isononyl) cyclohexane-1,2-dicarboxylate as a plasticizer for industrial vinyl plastisol formulations. J Appl Polym Sci 104 1215-1220... 

Microsol Vinyl plastisol Michigan Chrome Chemical... 

Thermasol Vinyl plastisols and organosols Lakeside Plastics... 

Figure 7.11. Color changes of various white coatings after Florida exposure (-) PVDF (- ) silicone polyester (- -) acryUc ( ) polyurethane (—) vinyl plastisol.

The entire installation is finished with a carpet of synthetic grass, which comprises usually a woven polypropylene lattice in which tufts of green polypropylene fibre or filament are fixed. The lattice is sealed on the under-side with a bonded film—which keeps the tufts in place and may be made from polyethylene, polyurethane, rubber latex, or vinyl plastisol. 

Many different adhesives have been tested and used in weldbonding. These include both high-strength structural adhesives, such as modified epoxies, and relatively low-strength adhesives, such as vinyl plastisols or epoxy-polysulfides that are commonly used for sealing and vibration damping. Table 14.10 shows that a variety of adhesives and substrates are compatible with the weldbonding process. 

Weldbonded aluminum joints (1-mm aluminum alloy 2036-T4) where compared with spot welded aluminum (1-mm aluminum alloy 2036-T4) and spot welded steel (1-mm steel 1010) joints.45,46 Weldbonded 2036-T4 joints made with a vinyl plastisol adhesive and with a one-part modified epoxy had a fatigue strength about twice that of the spot welded aluminum alloy and approximately the same as that of the spot welded steel. The fatigue strength of the weldbonded aluminum joints with polysufide-epoxy adhesive or with high-peel-strength epoxy adhesive is higher than that of steel spot welds alone. 

Polyethylene is by far the most popular material. Others used occasionally include vinyl plastisol (liquid rather than powder), nylon, polypropylene, and polycarbonate. The powder is usually ground to 35 mesh. 

Some high-flow plastics, such as nylon, have been used in small pellet form. Ethylene vinyl acetate and PEs are also used in specialized applications as are PVC, PC, TP polyester, nylon, and PP. RM vinyl plastisols produce different products such as beach balls, floating animals, and toys as well as industrial products. The liquid or powdered plastic used in this method flows freely into comers or other deep draws upon the mold s being rotated and is then fused by heat passing through the mold s wall. 

Rotational molding of vinyl plastisols is similar to the rotational molding of powder or liquid plastics (Chapter 13). Plastisol is placed in the mold and heated while the mold is being rotated. Molded products can include tanks, volleyballs, basketballs, doll heads and bodies, and various automobile parts. 

Std. strength Z K-600 Injection Molding Polyolefins, Vinyl Plastisol... 

Can be used as a nonionic emulsifier or coupling agent. It is used as a defoaraer in water base coatings, a viscosity depressant in vinyl plastisols, a viscosity control additive in hair rinse formulations, and as a paper softener. 

Heating the target material and immersing it in a thick suspension of the coating material, a partially cured fluid resin, or even a thick solution of the resin, so the resin would migrate to the heated object and gel on the hot surface, then be further baked or ambient cured in place. This is still a favored method of applying vinyl plastisols. (Plas-tisols are, however, more frequently applied by airless spray.)... 

Solidification. Solidification of the foamed liquid may be a physical or a chemical process. In thermoplastics solidification is generally accomplished by cooling the melt back to the solid state in vinyl plastisols and rubber latex solidification is accomplished... 

Typical Vinyl Plastisol Foam Formulations Ingredients... 

For washers and dishwasher tubs, porcelain is required that has an entirely different specification. Some manufacturers use vinyl plastisols for dishwasher liners with good success. 

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. 

An important feature of general concern to the vinyl plastisol compounder is the oil absorptivity of the inert and its effect on the rheology of the dispersion. A parallel property known as water absorptivity or water demand is of prime importance to the latex compounder. 

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