Acrylic resin

Characteristics of acrylic resin

Thermoplastic acrylic resin in the process of film formation does not occur further crosslinking, so its relative molecular weight is large, has good light and color retention, water resistance and chemical resistance, drying fast, convenient construction, easy construction recoating and rework, aluminum powder preparation of aluminum powder paint whiteness, good positioning.Thermoplastic acrylic resin is widely used in automotive, electrical, machinery, construction and other fields.

Thermosetting acrylic resin refers to the structure with a certain number of functional groups, in the production of paint through and join the amino resin, epoxy resin, polyurethane and other functional groups reaction to form a network structure, thermosetting resin is generally relatively low molecular weight.Thermosetting acrylic coating has excellent fullness, gloss, hardness, solvent resistance, weather resistance, no color, no yellowing when baking at high temperature.The most important application is made with amino resin amino - acrylic acid baking paint, at present in cars, motorcycles, bicycles, steel and other products are widely used.

classification

According to the mode of production, it can be divided into:

1, emulsion polymerization is through the monomer, initiator and distilled water reaction polymerization, the general resin is solid content of 50% of the emulsion, is containing about 50% water emulsion solution.The synthesized emulsion is generally milky white and blue (Tundall phenomenon), and the glass transition temperature is designed according to Fox formula.Therefore, the molecular weight of this type of emulsion is high, but the solid content is generally 40%-50%.Production industry requires precise control, due to the use of water as a solvent, environmentally friendly emulsion.

2. Suspension polymerization is a more complex production process, which is used as a method for the production of solid resin.Solid acrylic resin, using acrylic ester with methyl down reaction polymerization.Acrylate with methyl is generally with a certain functional group, its polymerization reaction in the reactor is not easy to control, easy to stick and burst the pot.The process is to put monomer, initiator, assistant into the reactor and then into distilled water reaction.After a certain time and temperature reaction, then wash, then dry, filter, etc.The production control of its products is relatively strict.If in the middle of which link do not get a bit, its products will have a certain impact.Mainly reflected in the color and molecular weight of the difference.

3, bulk polymerization is a kind of high efficiency production process.The process is to put the raw material into a special plastic film, and then react into lumps, take out crushing, and then filter, this method of production of solid acrylic resin its purity is all the production method can be the highest, product stability is the best, at the same time, its shortcomings are full.With the body polymerization of acrylic resin for solvent solubility is not strong, sometimes the same monomer the same ratio of suspension polymerization to dissolve several times, and the dispersion of pigment is not as good as suspension polymerization of acrylic resin.

4, other polymerization method of solvent reaction, reaction by the solvent together go down to do the intermediary material, after the reaction kettle is good and then desolvent.