Classification by production methods can be divided into:
1. Emulsion polymerization is the polymerization of monomer, initiator and distilled water together. Generally, the resin produced is an emulsion with a solid content of 50% and a latex solution containing about 50% water. The synthesized emulsions are generally milky white blue (Tindal phenomenon), and the glass transition temperature is designed according to the FOX formula. Therefore, the molecular weight of this type of emulsion is large, but the solid content is generally 40% -50%. The production industry requires precise control. Due to the use of water as a solvent, environmentally friendly emulsions.
2. Suspension polymerization is a relatively complicated production process, and it is a method used to produce solid resin. The solid acrylic resin was reacted and polymerized by using methacrylate. Acrylic esters with methyl are generally with certain functional groups. The polymerization reaction in the reaction kettle is not easy to control, and it is easy to stick to the pot. The process is to put monomers, initiators and auxiliaries into the reaction kettle and then put in distilled water to react. After a certain time and temperature reaction, wash with water, then dry, filter, etc. The production control of its products is relatively strict. If any of the links in the middle is not done properly, the products produced will have a certain impact. It is mainly reflected in the difference in color and molecular weight.
3. Bulk polymerization is a more efficient production process. The process is to put the raw materials into a special plastic film, then react into agglomerates, take out and crush, and then filter. The solid acrylic resin produced by this method has the highest purity among all production methods and the product is stable. Sex is also the best, and its shortcomings are also full. Acrylic resins polymerized by bulk are not very soluble in solvents. Sometimes the same monomers and the same ratio are more difficult to dissolve several times in suspension polymerization, and the dispersibility of pigments is not as good as suspension polymerization acrylic resins.
4. Other polymerization methods Solvent reaction. The solvent is used as an intermediary substance during the reaction. After the reaction kettle is ready, the solvent is removed.