Organic-borne acrylic copolymers
Organic-soluble acrylic paintwork materials are:
1. Cold setting materials based on thermoplastic polymers;
2. Thermoset polymer-base materials which cure during hot drying or by isocyanates.
The first group paintwork materials form coatings at ambient temperature within 1-3 hours as organic solvents volatilize during setting process. To produce these materials various copolymers of butylmethacrylate, methylmethacrylate, styrene, acrylic and methyl-acrylic acids are used as film formers. Their strong points are: high light-resistance of coatings, colorlessness and transparency of clear films and also good weather resistance and resistance to low (-50°C) and high (up to 160-180°C) temperatures. They form hard and elastic coatings with good adhesion to metals and with superior drying rate, hardness, thermal-, weather-, and tropical resistance compared to alkyd coatings. However, these coatings are easily soiled especially in hot climate, are not sufficiently resistant to gasoline and other solvents.
The second group paintwork materials form coatings at 125-180°C during 15-30 minutes or if isocynates are introduced. Thermosetting acrylic oligomers are copolymers of three or more monomers which contain reactive groups – hydroxyl, methylol, carboxyl, and others capable to interact with each other at elevated temperatures or with hardener groups. These polyarylates-based coatings are characterized by high hardness, good physical and mechanical properties, high finish, corrosion- and weather resistance. Coating life is up to 7-10 years; they have superior hardness, wet strength, detergent resistance, decorative properties, etc. compared to coatings based on alkyd-melamine enamels (ML-12, ML-1100).
Currently our technical experts are working on development of hydroxyl group containing acrylic copolymers to obtain coatings hardened with isocyanates, melamine-formaldehyde – and epoxy resins.
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"AcroChim” line acrylic copolymers
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