Acrylic Plastic Casting
Polymethyl methacrylate has effective and non Newtonian fluid characteristics in the temperature range of the forming process. The melt viscosity will decrease obviously with the increase of shear rate, and the viscosity of the melt is also sensitive to the change of temperature. Therefore, for the molding process of poly (methyl methacrylate), increasing the molding pressure and temperature can obviously reduce the viscosity of the melt and obtain better flowability.
acrylic plastic casting
Polymethyl methacrylate can be used in casting, injection molding, extrusion, thermoforming and other processes.
Casting molding is used to form organic glass plates, bars and other profiles, that is, to form profiles with bulk polymerization method. After casting, the product needs to be processed, and the post-treatment condition is 2H insulation at 60 DEG C and heat preservation at 120 2h.
The injection molding adopts suspension polymerization to prepare the granule material, which is formed in the ordinary
Plunger or screw type injection molding machine. Table 1 is typical process conditions for injection molding of polymethyl methacrylate.
Injection molding products also need post-processing to eliminate internal stress. The treatment is carried out in the hot air circulation drying box at 70-80 DEG C, and the processing time depends on the thickness of the product. Generally, it needs about 4h.
PMMA can also be used in extrusion molding, by suspension polymerization production of granular materials for preparation of organic glass plate, bar, pipe, sheet, but the preparation of profiles, especially since the polymer sheet, small molecular weight, mechanical properties, heat resistance and solvent resistance are not casting molding profiles, the utility model has the advantages of production high efficiency, especially for pipes and other casting mould. Difficult to make profiles. Extrusion can use single or double exhaust extruder, screw diameter ratio is generally 20-25. Table 2 is the typical extrusion process conditions.
Thermoforming is an organic glass plate or sheet made of various size and shape of products, will be cut into blank clamping required size in the mold frame, heating to soften, making it close to the mould surface pressure, with the same surface shape, shaped through cooling after finishing edge products. Pressurization can be drawn by vacuum drawing or by direct compression of punch with profile. The thermoforming temperature can be referenced to the temperature range recommended in table 3. When using the rapid vacuum low draft molding products, it is better to adopt near lower limit temperature, and the deep drawing products with complex forming shape should adopt near upper limit temperature and normally use normal temperature.
Acrylic arts and crafts (4 pieces)
Mainly for the molding acrylic or colored acrylic material for hollow and sculpture. Ordinary laser engraving cutting machine can meet most acrylic products carving and hollowing required.
Evowe acrylic texture board
PMMA is a polymer obtained from the polymerization of acrylic acid and its esters, collectively referred to as acrylic ester. The corresponding plastics are collectively referred to as polyacrylic plastics, among which poly (methyl methacrylate) is most widely used. The acronym for polymethyl methacrylate (PMMA), commonly known as organic glass, is the best quality of synthetic transparent materials so far.
PMMA has the advantages of light weight, low cost and easy molding. Its forming methods are casting, injection molding, machining, thermoforming and so on. Especially the injection molding can be produced in large quantities with simple process and low cost. Therefore, it is widely used, it is widely used in instrumentation parts, automotive lights, optical lenses, transparent pipes and so on.
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