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| Acrylic Introduction |
| Time：2011/7/16 10:53:12 Clicks：616 |
Material Acrylic is also known as PMMA or acrylic. Acrylic are in English, the Chinese name for translated is actually plexiglass. The chemical name for polymethyl methacrylate. Hong Kong people more than called acrylic, is a development of earlier important thermoplastics, with good transparency, chemical stability and weather resistance, easy to stain, easy processing, beautiful appearance, in the construction industry has a broad application .Plexiglass products generally can be divided into panels casting, extrusion and molding plastics. Application of PMMA is a lightweight, inexpensive, easy to shape and so on. Forming method, casting, injection molding, machining, acrylic thermoforming. Injection molding, can be mass-produced, the process is simple, low cost. Therefore, it is more widely applied, it is widely used in instrumentation parts, car lights, optical lenses, transparent pipeline. Acrylic is the best new materials capable of producing sanitary ware following the ceramic after. Compared with the traditional ceramic materials, acrylic addition to the unparalleled high-light-givers, as well as the following advantages: is of such good toughness, not damaged; reparative, as long as the soft foam dipped in toothpaste can be ware cleaned; soft texture, winter no cold biting sense; colorful, can meet the different tastes of the individual pursuit. Made with acrylic basin, bathtub, toilet, not only the exquisite style and durability, but also has environmental effects, the radiation levels of radiation and the body's own bone is almost the same. Acrylic sanitary ware first appeared in the United States, has been occupied for more than 70% of the entire international market. Acrylic is difficult to produce, high cost, so the market there are many inexpensive quality cheap substitutes. These substitutes is also known as "acrylic", in fact, is a common organic boards or composite panels (also known as sandwich board). Common organic board with ordinary plexiglass cracking raw material lighter casting, surface hardness is low, fade, polished with fine sand and polishing effect. The composite panels only very thin surface layer of acrylic, ABS plastic in the middle, by thermal expansion and contraction easy delamination. True and false acrylic, from the subtle color of the plate section and polished effect to identify building applications: windows, soundproof windows and doors, the dome, telephone booths and other advertising applications: light boxes, signs, signage, exhibition and other transportation applications : trains, cars and other vehicle doors and windows. medical applications: infant incubators, a variety of surgical medical devices civilian goods: sanitary facilities, arts and crafts, cosmetics, stand, aquarium and other industrial applications: surface of the instrument panel and cover, etc.lighting applications: fluorescent lamps, chandeliers, street lampshades.Characteristics of a polymethyl methacrylate containing polar methyl side, with the obvious moisture absorption, water absorption rate is generally 0.3% -0.4%, prior to molding must acrylic sheet shall be dry, dry conditions is 80 ℃ -85 ℃ dry 4-5h. (2) poly (methyl methacrylate) molding temperature range with the effective and apparent non-Newtonian fluid properties, melt viscosity with the shear rate increases will be significantly decreased, the change of melt viscosity on temperature is also very sensitive. Therefore, poly (methyl methacrylate) molding process to improve the molding pressure and temperature can significantly reduce the melt viscosity, good fluidity. 3 poly (methyl methacrylate) began to flow temperature of about 160 ℃, the decomposition temperature higher than 270 ° C, has a wide processing temperature range. 4 high melt viscosity of poly (methyl methacrylate), the cooling rate is faster, the products are prone to internal stress, therefore forming strict control of process conditions, products after molding the need for post-processing. 5 poly (methyl methacrylate) amorphous polymers, shrinkage and its range are small, generally about 0.5% -0.8%, forming a high dimensional accuracy of plastic parts. Polymethyl methacrylate cutting performance was very good, its profile can be easily machined requirements for a variety of sizes. |
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