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Introduction to plexiglass processing plexiglass is not very useful

by:UNQ     2021-03-29

   The processing limit oxygen index of plexiglass is only 17.3. Polymethyl methacrylate is easy to burn. Easy to shape and other advantages. The molding method is casting, and the organic glass is light in weight and low in price. Injection molding, machining, thermoforming, etc. Especially for injection molding, mass production is possible, the manufacturing process is simple, and the interest is low. Therefore, the application is becoming more and more extensive. At present, it is widely used in instrument and meter parts, automobile lights, optical lenses, transparent pipes, etc. In addition to its unparalleled high brightness, acrylic is the best new material for sanitary ware after ceramics. Compared with traditional ceramic materials. There are also the following advantages: good toughness and not easy to break; strong repairability, as long as you use a soft foam to dip the toothpaste, you can wipe the sanitary ware; the texture is soft, there is no icy feeling in winter; the color is bright, which can meet the individual pursuit of different tastes . Basins, bathtubs, and toilets made of acrylic are not only exquisite in style, durable, but also environmentally friendly. The radiation level is almost the same as the radiation level of the human body's own bones. Acrylic sanitary ware first appeared in the United States and currently accounts for more than 70% of the entire international market.

   plexiglass processing, so there are many low-quality and cheap substitutes on the market. These substitutes, also called 'acrylicLow surface hardness, easy to fade, poor polishing effect after sanding with fine sand. The composite board has only a very thin layer of acrylic on the outside and ABS plastic in the middle. It is easy to delamination due to thermal expansion and contraction during use. True and false acrylic can be identified from the slight color difference and polishing effect of the board section, chemical resistance and solvent resistance, but the strong inorganic acid can make it corrode, and the polymethyl methacrylate can withstand relatively dilute inorganic acid. It is resistant to alkalis, but warm sodium hydroxide and potassium hydroxide can make it etched, resistant to salts and oils, aliphatic hydrocarbons, insoluble in water, methanol, glycerin, etc., but can absorb alcohol and swell , And stress cracking occurs, and it is not resistant to ketones, chlorinated hydrocarbons and aromatics.

   The processing solubility parameter of plexiglass is about 18.8J/CM31/2. Many chlorinated hydrocarbons and aromatic hydrocarbons can be dissolved, such as dichloroethane, trichloroethylene, chloroform, toluene, etc., vinyl acetate and acetone are also It can be dissolved. Polymethyl methacrylate has good resistance to gases such as ozone and sulfur dioxide. Weatherability The samples have been subjected to a 4-year natural aging test, and polymethyl methacrylate has excellent weathering resistance. The weight changes, the tensile strength and light transmittance decrease slightly, the color is slightly yellowed, the crazing resistance decreases significantly, the impact strength is slightly improved, and other physical properties are almost unchanged. Flammability

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