Paint acrylic latices

Table 1. Exterior Acrylic Latex Flat Water-Based House Paint...

This molecule is a copolymer with polymethyl methacrylate (PMMA) in acrylic latex paints, where the hydrophobic PMMA is surrounded by hydrophilic polyvinyl acetate molecules. Such a suspension of a hydrophobic polymer wrapped in a hydrophilic polymer is called a latex. 

The Bingham plastic model can describe acrylic latex paint, with a yield stress of 112 dyn/cm2, a limiting viscosity of 80 cP, and a density of 0.95 g/cm3. What is the maximum thickness of this paint that can be applied to a vertical wall without running ... 

House paint—titanium extender in acrylic latex with 100% rutile titanium dioxide. 

Although acidic paint formulations based on the chlorine-containing vinyl acrylic latex copolymer give excellent anti-corrosive performance, they do exhibit two unusual features not present in the corresponding alkaline formulations ... 

Substrates, Paints and Coatings. Both flash rusting and underfilm darkening studies exployed a white, pH 4.5, primer formulation (see Appendix), designated as Standard, based upon Haloflex 202, a chlorine-containing vinyl acrylic latex. A zinc phosphate free formulation, designated as Non-Standard, of pH6 was prepared by substitution of zinc phosphate for barytes. The comparison paints were a commercial butyl acrylate-methyl methacrylate water borne primer, formulated at pH 9, and a solvent based chlorinated rubber primer. 

Acrylic latex coatings are ideal for house paint and architectural coatings because of their two big advantages to the consumer low odor and an easy cleanup with water. Acrylic latex coatings can be formulated to meet the extremely low VOC requirements being mandated by the EPA. 

The coating durability of organolead-treated southern pine in exterior exposure was reported (144), Significant improvement in the durability of a vinyl-acrylic latex and an alkyd paint on treated wood was demonstrated. Improved durability appeared to be independent of the type or concentration of the organolead-treated compounds. 

Acrylic latex paint (flat and semi-gloss)... 

Dalpad [Dow]. TM for a coalescing agent, a stable, low-odor, low-temperature film-forming aid for polyvinyl acetate and acrylic latex paints. 

A recipe to synthesize a vinyl acrylic latex for paint formulation is shown in Table 8. 

Latex describes the type of resin or binder used. Exterior paint usually contains 100% acrylic latex emulsions, which usually are copolymers of methylmethacrylate with butyiacrylate or 2-ethylhexylacrylate. This combination stands up well against uv radiation. Interior paint has no uv requirement, and the best combination for cost is a copolymer of vinylacetate and acrylates. Many other formulations are availabledepending on the use and quality desired. 

Today, the latex paint industry produces primarily acrylic and vinyl-acrylic (vinyl acetate-acrylic copolymer) paints. The vinyl-acrylic latexes are used most commonly in interior flat paints, while the acrylic latexes are used most frequently with exterior paints and interior gloss or semigloss paints. In 1981, approximately 30-40 million worth of cellulose ethers was sold to the paint industry to produce over 1 billion gallons of paint in the United States (36). 

Colloid. [Rhone-Poulenc/Perf. Resins Coatings] Polycarboxylate salts, acrylics dispersant, vise, stabilizer for paints defoamer latex processing aid. 

Hycar . [BFGoodrich BFGoodrichUK] Nitrile, ABS, acrylic latexes used for adhesives, carpet badxoatings, papa coatings and saturation, ingment binding, textile coatings, leather finishes, paints, resin modification. 

PVAc, styrene-acrylic, vir l/acrylic latexes for caulks, sealants, mastics, paints, industrial finishes. 

MAJOR USES Used in the manufacture of styrene-butadiene rubbers, plastics, acrylics, latex paints and resins organic intermediate in adiponitrile production. 

Surface chemical changes occur very rapidly when wood is exposed to the natural weathering process. Studies on the effect of short periods of weathering before finishing (9, 10) showed that adhesion of both an acrylic latex and an alkyd-oil primer to wood was significantly reduced after the wood substrate had weathered for 4 or more weeks before painting. Reduced paint adhesion and increased failure of the wood-paint interface will inevitably result in poor long-term paint and finish performance. These studies conclude that wood should be protected with a finish that will prevent... 

Table I compares typical test results for low-, mid-, and high-effective molecular weight thickeners in a vinyl-acrylic latex paint. Many of the same trends are present with cellulosic and HE UR thickeners when the effective molecular weight designation for HEUR thickeners is used. As the effective molecular weight of an HEUR increases, Stormer thickening efficiency, roller spatter, and water resistance increase, whereas ICI viscosity decreases. The major difference between these two thickener types is in their low-shear behavior. As effective molecular weight increases, cellulosic paints improve in leveling and decrease in sag resistance. HEUR paints decrease in leveling and improve in sag resistance. Other property differences between these two thickener types are highlighted in Table II.

Uses of Methyl Methacrylate. Methyl methacrylate polymerizes to form a clear plastic that has excellent transparency, strength, and outdoor durability. The automotive and building markets constitute the largest demand for acrylic sheet. Methyl methacrylate is also used in manufacturing acrylic paints including latex paints, enamels, and lacquers. 

PMMA has exceptional optical clarity and durability for outdoor exposure, with optimum resistance to alkalis, detergents, oils and dilute acids (but not to most solvents), and it is used mostly for glazing as a shatterproof replacement for glass, for lighting, for curtain-wall panels as a sealant and for decorative features, and in acrylic latex paints (containing PMMA suspended in water). There are also PMMA compounds specially developed for production of complex medical components. 

Some of the multifunctional crosslinking monomers used in emulsion polymerization include pentaerythritol tetraacrylate and trimethylolpropane triacrylate (high boiling, low viscosity, fast cure system for vinyl acrylic latex paints) [34]. 

In practical latex formulations, the latex particle size can play a major role in determining the rheology obtained with a given associative thickener. A thickener which provides nearly Newtonian flow with a large particle size, relatively hydrophilic latex (such as an interior paint grade vinyl-aciylic latex) may produce veiy high low-shear viscosity, and shear thinning when a smaller particle size, more hydrophobic acrylic latex is used in the same formulation. 

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