Acrylic resin paintis made from acrylate or methacrylate polymers Coatings, the raw materials of this kind of products are produced by petrochemical industry, which are cheap and rich in resources. In order to improve performance and reduce costs, a certain proportion of olefinmonomer is often used Copolymerized with it, such as propylenenitrile, acrylamide, vinyl acetate, styrene wait. Different copolymers have their own characteristics, so can produce various types of coatings according to product requirements.
They have many common features:
(1) It has excellent color and can be made into water-white varnish and pure white enamel with excellent transparency.
(2) Good light and weather resistance, resistant to ultraviolet irradiation without decomposition or yellowing;
(3) Maintain gloss and color, and can maintain the original color for a long time;
(4) Good heat resistance;
(5) Resistant to general acids, alkalis, alcohols and greases, etc. ;
(6) It can be made into a neutral paint, and mixed with copper powder and aluminum pine, it will be as dazzling as gold and silver. The color will not darken;
(7) It will not deteriorate after long-term storage.
Acrylic CoatingsDue to their excellent performance, they have been widely used in automobile decoration and repair, household appliances, steel furniture, aluminum products, coils, machinery, instrumentation appliances, and construction. , wood, papermaking, adhesives and leather and other production fields, it is widely used and is a relatively new high-quality coating.
Thermoplastic acrylic resin paint
Thermoplastic acrylic paint relies on solvent evaporation and drying to form a film. In addition to acrylates, the paint components also include solvents and other additives. They are sometimes combined with other mutually miscible resins for modification. Therefore, as a film-forming material, the glass transition temperature Tg of thermoplastic resin should be as low as possible, but not so low that the resin will agglomerate or gel. Its properties depend on the monomers used, monomer ratio, molecular weight and distribution. Since the resin itself is no longer cross-linked, if the paint made from it does not use graft copolymerization or interpenetrating network polymerization, its properties such as adhesion, Tg, flexibility, impact resistance, corrosion resistance, and heat resistance The electrical properties and electrical properties are not as good as those of thermosetting resins.
Generally, resins with large molecular weights have good physical, mechanical and chemical properties, but high molecular weight resins have poor solubility in solvents and high viscosity , drawing phenomenon is prone to occur during spray painting construction. Therefore, the molecular weight of acrylic resin for general paint is not too high. The main advantages of this type of resin are:
Water white and transparent, with excellent water resistance and UV resistance. Therefore, it was originally used as a topcoat and repair paint for cars, and recently it is also used as a light-fast decorative paint for exterior wall coatings. Another main use is as a sealing material for cement concrete roofs and floors and as a coating for plastics, plastic films and metal foils.
(1) Acrylic resin varnish uses acrylic resin as the main film-forming substance, and adds appropriate other resins and additives. Can be formulated according to user needs. For example, the acrylic resin paint used in the aviation industry requires high light resistance and weather resistance; leather products require good flexibility. Adding plasticizer can improve the flexibility and adhesion of the paint film, and adding a small amount of nitrocellulose can improve the oil resistance and hardness of the paint film.
Thermoplastic acrylic resin varnish has the characteristics of fast drying (drying in 1 hour), colorless and transparent paint film, and stronger water resistance than alkyd varnish . When used indoorsoutdoor use, the light resistance and weather resistance are also better thanonePentaerythritol alkyd varnish is better,However, is a thermoplastic resin, which has poor heat resistance and is easily affected by heat. Tacky. At the same time, it is not easy to make coatings with high solid content.Dissolve during sprayingAgent Large consumption
(2) Acrylic resin enamel can be made by grinding acrylic resin with solvents, additives and pigments. Acrylic enamel paint is used in high-speed electric trains. Compared with alkyd paint, the maintenance intervals are longer, less polluted, better in alkali resistance, and dries quickly.
Formula: acrylic enamel (mass ratio)
|
Acrylic |
1 |
tricresyl phosphate |
0.016 |
|
Trimeric amine formaldehyde resin |
0.125 |
Titanium dioxide |
0.44 |
|
Dibutyl tricarboxylic acid tide |
0.015 |
solvent |
4.70 |
(3) Primer acrylic primer oftenWarm and dry, good adhesion, will Not suitablefor VariousVolatile paints(Such as nitrocellulose paint)matching primer . The internal acrylic primer has good adhesion to the metal substrate, especially after being immersed in water. , this is itsoutstanding advantage ,,一GenerallyWarm drydry, but after 100~ 120℃DryingAfter, its performance can be improvedaStep forward.
