Waterborne acrylic paints

The appropriate amount of biocide carrier composition needed to yield a specified dry film concentration of biocide was added to a fixed quantity of waterborne acrylic paint and premixed using a high-speed disperser. This dispersion was then transferred to a Silverson-type mixer to obtain a finer dispersion. At this stage the influence of addition of silica or zeolite on the physical/mechanical properties of the paint film was assessed, though only minor changes in properties were noted, which could be eliminated by appropriate adjustments to the paint formulation. 

Table 9.8 shows the composition (FP 2019/1) of waterborne acrylic paints to which varying amounts of glycerolpropylsilyl-modified silica dispersion (Bindzil CC301) have been added to the binder formulation, i.e., the letdown. Positions 9-13 in Table 9.8 constitute the letdown in the paint formulation, whereas positions 1-8 constitute the mill base of the paint formulation. The reference formulation in table 9.8 does not contain any glycerolpropylsilyl-modified silica dispersion in the letdown [68]. 

Acrylic emulsions, or better referred to as waterborne dispersion acrylic paints, were introduced in the 1950s and soon became the most used artists media because of their... 

Acrylate-methacrylate copolymers (pure acrylates) are used in particular for house paints and other emulsion paints with high weather resistance and for waterborne industrial paints. 

Field trials have shown that the expected durability of the new waterborne coating systems is equal to that of conventional solventborne paints. As a further advantage, the number of single coats can be reduced from three to two. Standard freight cars are painted with a three-coat alkyd system consisting of an anticorrosive primer, an intermediate coat, and a topcoat, total DFT is ca. 150 pm. Such systems are being replaced by single-coat systems of waterborne acrylic resins and acrylic copolymers to reduce solvent emission. 

Pigmented, two-pack, waterborne epoxy resin coatings (garages) or one-pack waterborne acrylic resin emulsion paints are used for areas that receive less wear (e.g., cellars). Wooden parquet floors are coated with one- or two-pack polyurethane varnishes that can be applied by spraying or brushing. Acrylate-based waterborne parquet varnishes are also used because they are environmentally friendly. 

Heating oil storage premises must be equipped with a collection trap so that any heating oil leaking from the tank cannot contaminate the soil. The interior of these premises must be painted with an officially approved coating material that is not dissolved or penetrated by heating oil. The coating must also cover cracks in the substrate. Multilayer systems based on waterborne acrylic resin dispersions are suitable for this purpose. 

Uses Dispersant for org./inorg. pigments/extenders in waterborne all d-and acrylic paints, e.g., gloss and silk finish emulsion paints Features Permits prod, of emission-free paints Properties Lt. brn. clear liq. dens. = 1.05 g/cm (20 C) dynamic vise. 

Uses Detoamer tor waterborne architectural paints and industrial coatings, coatings based on acrylics, styrenated-actylics, and PUs... 

Chem. Descrip. Bis (1-2,2,6,6-pentamethyl4-piperidinyl) sebacate and methyl (1,2,2,6,6-pentamethyl-4-piperidir ) sebacate Uses Lt. stabilizer for exterior paints/coatings, automotive coatings, industrial coatings, wood stains, thermoplastics, acrylics, alkyds, polyes-ter/melamine, thermosetting acrylics, waterborne acrylics, phenolics, vinylics, radiation-curable acrylics, PU, PP, PE, styrenics, unsat. polyester... 

Chem. Descrip. Proprietary organic mineral oil-based blend Uses Defoamer for use with latex emulsions, waterborne architectural paints, plasters, adhesives (SBR, PVAc, acrylic, water-sol. resins), coating and latex printing defoamer in atmospheric dyeing, printing and textile finishing processes defoamer in food-contact paper coatings food pkg. adhesives... 

Fig. 5.7 Florida gloss retention for waterborne masstone paints based on copolymer PVDF-acrylic (70 30 by weight) hybrids. Initial pigment volume concentrations in these coatings were about 20 %. The lack of chaUdng after 10 years exposure and the pattern of initial gloss loss, followed by a gloss plateau region, are consistent with what would be predicted by a 2-resin contraction model...

It was also shown that stable latexes of high solid content, and small particle size could be practically obtained by this emulsion polymerization technique. Such microlatexes based on acrylic polymers modified by polyesters are an interesting approach to waterborne coatings leading to high gloss paint films (9). 

Polymer Dispersions (Emulsion Polymers). Waterborne paints based on polymer dispersions (usually referred to as emulsion paints) are not water soluble. They are water-thinnable systems composed of dispersions of polymer particles in water (see Section 3.5). The particles consist of high molecular mass polymers (e.g., of styrene, butadiene, acrylate, or vinyl monomers) and are produced by emulsion polymerization. These waterborne paints also contain small amounts of organic solvents (< 5 wt %) that serve as film-forming (coalescing) agents that partially evaporate on drying. 

Although two-pack epoxy primers and polyurethane intermediate coats have high solids contents, they still contain significant amounts (20-30 wt%) of organic solvents. In polyurethane topcoats, the VOC is even higher. Anticorrosive, waterborne primers based on aqueous dispersions of two-pack epoxy resins and one-pack acrylic resins have been developed to decrease solvent emission. Waterborne, one-pack acrylic topcoats are also used. All of these waterborne paints contain 2 - 5 % organic cosolvents that are required for film formation. 

For many years, paints used to coat cans contained considerable amounts of volatile organic solvents. Waterborne can coatings were developed to reduce solvent emissions and are used worldwide. Binders used in waterborne can coatings are modified epoxy resins (see Section 2.10). Acidic acrylate chains are grafted onto an epoxy molecule. After partially neutralizing with amines, the resins can be dispersed in water. 

Uses Acrylic film-former in protective metal coatings, latex paints, ceramics, adhesives, textiles, cosmetics, paper, leather, floor polishes, chemir spedalties exc. dispersant, leveling, and binding chars. plasticizer for solv. or waterborne systems provides exc. pigment wetting Features Thermoplastic... 

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