Acrylic latex formulations

A series of conductive electroactive paints were prepared by blending polypyrrole colloids (20-80 wt %) with an acrylic latex formulation in water [136]. Dip coating of lead, stainless steel, and Zincalume substrates resulted in strongly adherent electroactive coatings having electrical conductivities. similar to carbon-filled paints. The addition of the CP colloids to the latex paint increased adhesion. 

Table 6. One-Part Clear Acrylic Latex Sealant Formulation ...

One-part clear acrylic latex sealant formulation, 22 42t One-part manganese dioxide-cured polysulfide formulation, 22 4 It One-part pigmented siliconized acrylic latex sealant, 22 42t One-part RTV silicones, 22 596 One-part silicone cross-linkers, 22 33t One-part silicone sealant formulation, 22 34t... 

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. 

Primer Formulation Based on Chlorine Containing Vinyl Acrylic Latex... 

Acrylic latex sealants. Basic acrylic latex sealant formulations were compounded in a sigma blade mixer, as shown in Table 3. The water-borne silanes were then incorporated into a base. Standard wet and dry peel adhesion determinations from various substrates were performed periodically in accordance with ASTM C794-8. 

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. 

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. 

A second generation of phenolic dispersions, patented by J. S. Fry (33). involved the post dispersion of phenolic resins in a mixture of water and water-miscible solvents. To conform with air pollution regulations, the solvent was held to 20 volume %, or less, of the volatiles. A heat-reactive phenolic resin dispersion (34) and a phenolic-epoxy codispersion have become commercially available based on the above technology. Supplied at 40-45% solids, these products, which have a small particle size (0.75-1.0 ym), are better film formers than the earlier dispersions. Used alone or in blends with other waterborne materials, corrosion-resistant baking coatings may be formulated for coil coating primers, dip primers, spray primer-surfacers, and chemically resistant one-coat systems. Products of this type are also tackifiers for acrylic latexes, and such systems have been employed as contact, heat seal, and laminating adhesives for diverse substrates. 

Starch utilization in plastic and rubber compositions began in the 60s and 70s, with oxidised starch in rubber and other polymers, such as urethane foams, poly(vinyl alcohol) and copolymers of poly(ethylene-co-acrylic acid) formulations, and as a filler in plasticized polyvinyl chloride (PVC) [37,39]. In another technique, gelatinized starch was mixed with PVC latex and the water was removed to give a PVC-starch composition, which was mixed with a PVC plasticizer such as dioctyl phthalate (DOP). 

Acrylics are formulated as water-emulsion latex, thermoplastic, or thermosetting resin. 

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. 

The control and reproducibility of particle size and particle size distribution is important to the quality of acrylic and styrene-acrylic latex products. Particle size has large effects on latex viscosity and the rheology of formulated products and may also exert subtle effects on the end-use peiformaiKe properties. The particle size is controlled primarily by the choice and amount of surfactant, or by the use of seed latexes. A recoit article [32] addresses the use of surfactants to control particle size in semi-continuous acrylic polymmzations. Many surfactants are reconunended by surfactant manuhicturras for the preparation of acrylic and styrene-acrylic latexes [33]. Sodium lauryl sulfate, sodium dodecylbenzene sulfonate, sulfosuccinates and the aUtylphonl ethoxylates ate typical. The patent literature contmns many discussions of the use of single [34] or multiple [3S] polymer seed latexes to control particle size. 

TVpically, acrylic acid (AA) or methacrylic acid (MAA) (1 carboxyl group per monomer molecule) are used in latex formulations. Glacial AA and glacial MAA are liquids with boiling points of 141 and 161°C (at 1 atm), respectively [9]. The homopolymer Tg for AA is 106 C, while that for MAA is 185°C. Both functional monomers are soluble in water and tend to form water-soluble polymer. 

Particle and colloidal stability, that is, lack of sedimoitation, stratification or phase separation, coagulation or flocculation, or changes in viscosity when the latex is stored, shipped, pumped, sprayed, formulated, etc. is required for most end-uses of acrylic and styrene-acrylic latexes. Such stability is primarily determined by the type and level of surfactants or other stabilizers and specialty or auxiliary monomers used. The trade-off is that functional materials contributing to particle and colloidal stability generally also increase water or moisture sensitivity, and there is an optimum balance for each end-use application. 

Alkyds are used for finishing metal and wood products but not to the degree previously used. Their durability to interior exposure is good, but their durability to exterior exposure is only fair. Because of their formulating flexibility, they are used in fillers, sealers, and caulks for wood finishing. They are still used for finishing by the machine tool and other industries. Alkyd-modified acrylic latex paints are excellent architectural finishes. 

Chem. Descrip. Branched sodium dodecylbenzene sulfonate CAS 25155-30-0 EINECS/ELINCS 246-680-4 Uses Emulsifier for emulsion polymerization (SBR, vinyl acetate, vinyl chloride, styrene, and acrylic latexes), paints/coatings emulsifier, dispersant for agric. formulations surfactant for washing fruits and vegetables food pkg. adhesives, paper defoamer in food-contact paper/ paperboard emulsifier in mfg. of food-contact articles Regulatory FDA 21 CFR 175.105,175.300,175.320,176.170,176.180, 176.200,176.210,178.3400 exempt from tolerance under EPA40CFR 180.1001 (c) (e) BGA XIV compliance Properties Flakes pH 6.0-9.5 (10%) surf. tens. 32 dynes/cm ( CMC) anionic 98% act. 

Uses Monomer for creation of new polymer backbones and in formulating high performance acrylic latexes, plastic and rubber modifiers, coatings, adhesives, polyol modifiers, oil field demulsifiers, textile finishes, vise, modifiers, reactive chems. 

Nalco 2305 antifoam, acrylic latex Advantage 357 Defoamer Antibubble DF-134 Antibubble DF-135 Geo FM DF-122 Geo FM DF-122-NS antifoam, acrylic polymers Geo FM VF Geo FM VFS antifoam, acrylic semigloss formulations Foamacure 142 Foamacure 170 Foamacure 190 Foamacure 281 Foamacure 301 Foamacure 305 antifoam, acrylics Bubreak 454C Bubreak 4400 ... 

Storage Sensitive to moisture store in cool, dry place store under nitrogen keep tightly closed Uses Monomer for creation of new polymer backbones and in formulating high performance acrylic latexes, plastic and rubber modifiers, coatings, adhesives, polyol modifiers, oil field demulsifiers, textile finishes vise, modifiers, reactive chems. Manuf./Distrib. ABCR http //www.abcr.de, Aldrich http //www.sigma-aldrich.com, TCI Am. http //www.tciamerica. com... 

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