Pigments coating properties

The exceUent adhesion to primed films of polyester combined with good dielectric properties and good surface properties makes the vinyhdene chloride copolymers very suitable as binders for iron oxide pigmented coatings for magnetic tapes (168—170). They perform very weU in audio, video, and computer tapes. 

Table 5. Coating Properties of Pigmented Poly(HAMCL) Alkyd Paints...

The investigations comprised zino pigmented coatings with the aim of testing the mechanism of their action and looking for ways of improving protective properties. With the use of impedance technique the meohanism for two periods of activity has been proven with these coatings. 

Another question is the proper technique for the evaluation of protective properties of zinc pigmented coatings. IMtll now, the most popular one is the test in a salt chamber (12.141. This technique does not allow a complete understanding of the complex phenomena oo-ouring in the coating. It seems that the impedance technique selected in this work provides more adequate and useful data. 

The Impedsuice technique permits observation of the effect of modifying dltlves on protective properties of highly zlno pigmented coatings. 

It has been found that protective properties of zinc pigmented coatings can be enhanced b using zinc phosphate as an additive Influencing the performance of the coatings In the second stags of their protective action. 

Negative results have been obtained with oarbon black as an additive Intended to Improve protection properties of zinc pigmented coatings b Influencing the first stage of their protective action. 

Barium metaborate [13701-59-2], BaO B203 H20, [5.78] and zinc borophos-phate [84012-98-6], ZnO x B2Oa-y P205-2H20, are colorless pigments. Their properties are listed in Table 44 their uses in various binders are listed in Table 39. They both have a relatively high water solubility. Barium metaborate is coated with silica to reduce this. 

Acrylated oil epoxy acrylates These epoxy acrylates are essentially epoxidized soybean oil acrylate. These resins have low viscosity, low cost, and good pigment wetting properties. They produce relatively flexible coatings. Acrylated oil epoxy acrylates are used mainly in pigmented coatings or to reduce cost. 

Vinyl lacquers are used mainly where a high degree of chemical resistance is required these lacquers are based on vinyl chlorides and vinyl acetates. Acrylic lacquers are based on methyl methacrylate and methyl acrylate polymers and copolymers. Other esters of acrylic and methacrylic acid also may be used to make nonconvertible film formers. Judicious selection of these acrylic acid or methacrylic acid esters allows one to produce film formers with specifically designed properties such as hardness, flexibility, gloss, durability, heat, and chemical resistance. Acrylic lacquers, however, are not noted for their water resistance. The principal uses of acrylic-type lacquers are fluorescent and metallic paints, car refinish applications, clear lacquers and sealers for metals, and protective coatings for aircraft components and for vacuum-deposited metals, as well as uses in pigmented coatings for cabinets and appliances. 

Among the most important uses of cadmium in the United States is in the production of nicad (nickel-cadmium), or rechargeable, batteries. It is also used in pigments, coatings and plating, manufacture of plastic products, and alloys. An alloy is made by melting and mixing two or more metals. The mixture has properties different from those of the individual metals. 

SPI continues to be used in paper manufacturing. Under selective conditions of pH and chemical reactants, the protein is modified to improve its influence as a coating modifier and dispersant (Coco et al., 1990). Only modified proteins are used in the industry today, and these modifications have continually improved the functionality of the protein (e.g., viscosity, water-retention, and pigment-stabilizing properties) and kept them competitive in the industry (Coco et al., 1990 Krinski Hou, 2000). 

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