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UV protection: It can prevent super strong ultraviolet rays, and only some single-layer board surface turns yellow or smashed under long-term sunlight. Also suitable as a low temperature resistant material. The PC board has excellent thermal insulation performance. Under the same thickness condition, the thermal insulation performance of the PC board is about 16% higher than that of the glass, which can effectively block the heat transmission. Whether it's warm in winter or prevent hot air intrusion in the summer, PC boards can effectively reduce building energy consumption and save energy.
Anti-combustion performance: PC board has good flame retardancy. It does not produce toxic gas when burned. Its smoke concentration is lower than that of wood and paper. It is determined to be a first-grade flame retardant material and meets environmental protection standards. After 30s of burning samples, the burning length does not exceed 25mm, and the flammable gas is decomposed when the hot air is as high as 467 °C. Therefore, after relevant measurements, it is considered that its fire performance is qualified.
Anti-chemical substances: no reaction to acid, alcohol, juice, beverages; gasoline, kerosene also has a certain resistance, no cracks or loss of light transmission within 48h of contact. However, it is poor in chemical resistance to certain chemicals such as amines, esters, halogenated hydrocarbons, and paint thinners.
Light weight: The density of polycarbonate is about 1.29/cm3, which is half lighter than glass. For example, it is made into hollow PC board, and its mass is 1/3 of plexiglass, which is about 1/15~1/12 of glass. The hollow PC board has excellent stiffness and can be used as a skeleton member. The lightweight of the PC board makes construction safer and more convenient, which can greatly save shipping and construction time and cost.
The production process of the PC board is extrusion molding, and the main equipment required is an extruder. Because the processing of PC resin is difficult, the requirements for production equipment are high. Most of the domestic equipment for the production of PC boards is imported, most of which are from Italy, Germany and Japan. Most of the resins used were imported from GE in the United States and Baver in Germany. Prior to extrusion, the material should be thoroughly dried to a moisture content below 0.02% (mass fraction). Extrusion equipment should be equipped with a vacuum drying hopper, sometimes several in series. The fuselage temperature of the extruder should be controlled at 230-350 ° C, gradually increasing from the back to the front. The handpiece used was a flat-slit slit head. After extrusion, it is cooled by calendering. In recent years, in order to meet the UV resistance requirements of PC boards, a thin layer containing UV-resistant additives is often applied to the surface of PC boards. This requires a two-layer co-extrusion process, that is, the surface layer contains UV additives. The bottom layer does not contain UV additives. The two layers are compounded in the nose and integrated into one after extrusion. This type of machine head design is more complicated. Some companies have adopted new technologies, such as Bayer's technology with specially designed melt pumps and combiners in co-extrusion systems. In some cases, there is no requirement for dew drops on the PC board, so there should be an anti-dew coating on the other side. There are also PC boards that require UV-resistant layers on both sides. This PC board production process is more complicated.
Generally, there are two kinds of resins purchased by the sheet production factory, one is a common PC resin, and the other is a PC resin containing an anti-UV additive. The selected UV-resistant additives are as large as the following:
(1) Salicylates such as p-tert-butylphenyl salicylate (TBS).
(2) benzophenones such as 2-hydroxy-4-methoxybenzophenone (UV-9); 2-hydroxy-4-methoxy-2'-carboxybenzophenone (UV- 207); 2-hydroxy-4-n-octyloxybenzophenone (UV-531).
(3) benzotriazoles such as 2-(2'-hydroxy)-3,7,5'-di-tert-butylphenylbenzotriazole (UV-320); 2-(2'-hydroxy-5 '-tert-octylphenyl)benzotriazole (uV-5411) and the like. The PC board is prone to internal stresses, and the presence or absence of internal stress on the sheet can be checked by carbon tetrachloride immersion and polarized light. The internal stresses present in the sheet can be eliminated by annealing.
The stadium roof lighting panel LEXAN solar control products are made of single-layer and multi-layer polycarbonate sheets. The single-layer product is LEXAN TMEXELLV solar control IR plate, and the multi-layer product is LEXAN force display THER-MOCLEAR solar control plate. This new type of sheeting greatly reduces the transmission of light energy while providing a high degree of light transmission and saving energy costs in cooling and brightening effects. Widely used in domes, skylights, walkways, greenhouses, and other buildings where high light is required and waste heat must be kept to a minimum.