The most important properties of acrylate resin are its transparency, good optical properties, surface hardness, chemical resistance and good weather resistance. Its transparency is close to crystal and its density is only half of crystal. It can be processed into fibers, sheets, films, profiles, pipes, etc. The material is supplied in pellet form and can be extruded, calendered or injection molded. Acrylic resin refers to a large family of resins that are tough and transparent. Acrylic resins can be used alone or in combination, or contain some other monomers, so that the performance of the polymer from soft and flexible to hard or strong. This polymer is polymerized from methacrylic monomer (MMA) and ester or amine, acrylic or methacrylic acid derivatives. Acrylic resins are free radically polymerized and catalyzed by peroxides or nitrogen compounds. The polymer can also be obtained by redox polymerization. Polymethyl methacrylate (PMMA) is the most important homopolymer in the acrylate family and can be produced by bulk polymerization, suspension polymerization, emulsion polymerization or solution polymerization. Adding pigments or dyes can produce transparent or translucent resins of various colors. Blending with vinyl resin, butadiene resin, acrylic rubber or polyester can improve the physical properties of the material. The various PMMA resins used in injection molding have different molecular weights, resulting in different flow rates, heat resistance and toughness. The PMMA resins rated by the ASTM standards as grades 5, 6, and 8 have a medium molecular weight. The change in formulation changes the flow rate and heat resistance, and at the same time exhibits certain toughness. In addition to similar fluidity and heat resistance, high molecular weight PMMA resins are also tougher. Because of their excellent fracture resistance during assembly and transportation, these grades of resins have also become the first choice for extrusion molding. In injection molding, these grades of materials not only show good fracture resistance, but also tend to fill complex molds. The transmittance of visible light reaches 92%, and the turbidity is less than 2%. Ordinary grade acrylic resin products are somewhat sensitive to notches, very low conductivity, good arc resistance, and excellent dielectric strength. Sheet products are usually formed by casting (injecting MMA and other substances between two smooth glass plates and clamping them with gaskets or clips to obtain plates of different thicknesses). This is a batch processing method. Since this reaction is exothermic, the reaction rate needs to be controlled to avoid the formation of bubbles. Another method of producing sheets is to use continuous casting, which places the polymer between two moving smooth stainless steel strips. In addition, sheets can also be produced by extrusion or calendering methods. Each of these methods has advantages and disadvantages, and it cannot be said that one of the processing methods must be better than the other. Generally, cast acrylate resin products have better optical properties and smoother surfaces; sheets produced by the continuous method can obtain longer sheets, and the thickness variation is also smaller than casting molding; and extrusion or calendering methods are usually The casting cost is low. For fracture-resistant applications, people usually use impact-modified pellets and use extrusion molding to produce sheets. This method generally requires a longer length-to-diameter ratio (L / D) of the extruder screw, which can better control the melt in the die. In order to improve the melt quality, a static mixer should be installed between the screw and the die. To ensure a high yield downstream after the die, the roll needs to be better polished. Engraving and engraving patterns on the roll can bring different surface polishing effects or other special effects to the sheet. Acrylic resin can be co-extruded with vinyl resin or ABS resin as the core layer of the sandwich structure board, so that the board has the functions of ultraviolet resistance, heat insulation or protection of smooth surfaces. PMMA can be processed using a conventional injection molding machine. Since this resin is a hygroscopic material like nylon and polyester, the material must be dried before injection, otherwise an exhaust pipe must be installed on the injection machine. The viscosity of PMMA is higher. In order to produce high-quality products, the injection pressure of this material is generally higher than that of other thermoplastics. In the processing of some special products, such as automobile taillights, the mold usually also needs to be chrome plated to obtain a smooth surface, and the exhaust function of the mold is also very important. The elastic memory is very good, and its sheets can be produced using general-purpose thermoforming equipment. Because of the low hot melt strength, PMMA is limited in blow molding, which means that it is very difficult to extrude blow molded unmodified acrylate resin. However, it can be processed by injection molding, and then heated to complete blow molding. Plexiglass is an important application of PMMA, especially for aircraft glare windows. Although it may be less in absolute usage than other applications, it plays a very important role in aircraft. 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