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Electric properties of polystyrene
by：CSSSLD
2021-02-03
Relative molecular mass of the heat-resistant resin type GPS is higher, low residual styrene monomer content, softening point about 7 ℃ higher than the general GPS and suitable for extrusion molding and injection molding of high quality plastic injection products processing;
Secondary flow and high flow GPS with low relative molecular mass, with a certain amount of lubricant,
Butyl stearate, liquid paraffin wax, stearic acid, zinc, etc. )
Type, flow, and reduces heat resistance, and is especially suitable for forming thin-walled products and shape of complex products.
PS the refractive index of 1. 59 - 1. 60, light transmittance up to 88% 92%, with excellent optical performance and transparency, transparency in the plastic index after acrylic polymers. But after PS subjected to sunlight, dust, can appear the phenomenon such as turbidity, yellow, and using optical components can be added to 1% unsaturated fatty acid ammonium, ring amine or amino alcohols compound, to improve the weatherability of the PS, made the products of the high transparency.
PS coloring extremely easily, can be mixed with organic or inorganic colorant, made into all kinds of bright color of the products. PS resin has both homopolymer and modified varieties, sort is more, the domestic production of PS mainly has three categories: general PS, PS, high impact grade PS and expandable. GPS is mainly refers to bulk polymerization and suspension polymerization of PS homopolymer. According to the content of volatile matter, additives, relative molecular mass, the industry often divides into the GPS heat resistance, secondary flow and high flow three categories.
PS is more easily in thermoplastic processing of one of the varieties. PS of melting temperature and decomposition temperature difference is bigger, forming wide temperature range and low melt viscosity, easy to processing. Apparent viscosity is more sensitive to shear rate and temperature, the shear plastic. PS was lower than those of PE and PP, the specific heat of the plasticizing rate and solidification rate faster, which can shorten the production cycle in the injection molding.
PS is amorphous polymers, molding shrinkage of small, dimension stability is good. PS bibulous rate is low, the general products can directly instead of dry processing. But for the appearance of the products of the high quality requirements, needs in the 60 - before molding Under the 80 ℃ drying time appropriately, remove the free moisture of raw materials. Because of the PS molecular chain rigidity, very brittle, thermal expansion coefficient is larger than the metal, so products should not be with a metal insert, lest produce stress and cracking around the insert. If you must with a metal insert, QuanJian had better use copper or aluminum, and preheated. In addition, in the product design, if no special needs, should avoid a right Angle, acute Angle, gap, etc.
PS = = volume resistivity and surface resistivity is high. Dielectric loss tangent value is extremely low, and is not influenced by frequency and temperature, are excellent electrical insulating materials. In addition, because of the PS depolymerization, start of the 300 ℃ or more volatile monomers can prevent the surface carbonization, therefore also has the good arc resistance. But because of the PS heat resistance is poor, limit its some applications in electrical. At different polymerization methods of PS, bulk polymerization of PS minimum content of impurities, thus better performance.
in shaping, PS melt into the cavity by a higher shear, macromolecule is easy to produce orientation in the direction of the material flow, if the orientation of macromolecule in internal stress relaxation elder freezing can make the products. With the internal stress of products is easy to produce silver lines or cracking, especially under certain environmental media is more serious. To eliminate internal stress of products, in addition to adjust the mold temperature, melt temperature and the process parameters such as the holding time, still can heat treatment was carried out on the products, the products in the 60 - 80 ℃ hot water, or let stand 1 - drum wind drying oven 4 h, and then slowly cooled to room temperature. Orientation in the process of the macromolecular chain relax, so as to reduce or eliminate the internal stress of injection molding processing products.
more excellent articles: styrene monomer polymerization, click directly.
http://www。 csssld。 cn//html/2017/Info_1001/688。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
PS the refractive index of 1. 59 - 1. 60, light transmittance up to 88% 92%, with excellent optical performance and transparency, transparency in the plastic index after acrylic polymers. But after PS subjected to sunlight, dust, can appear the phenomenon such as turbidity, yellow, and using optical components can be added to 1% unsaturated fatty acid ammonium, ring amine or amino alcohols compound, to improve the weatherability of the PS, made the products of the high transparency.
PS coloring extremely easily, can be mixed with organic or inorganic colorant, made into all kinds of bright color of the products. PS resin has both homopolymer and modified varieties, sort is more, the domestic production of PS mainly has three categories: general PS, PS, high impact grade PS and expandable. GPS is mainly refers to bulk polymerization and suspension polymerization of PS homopolymer. According to the content of volatile matter, additives, relative molecular mass, the industry often divides into the GPS heat resistance, secondary flow and high flow three categories.
PS is more easily in thermoplastic processing of one of the varieties. PS of melting temperature and decomposition temperature difference is bigger, forming wide temperature range and low melt viscosity, easy to processing. Apparent viscosity is more sensitive to shear rate and temperature, the shear plastic. PS was lower than those of PE and PP, the specific heat of the plasticizing rate and solidification rate faster, which can shorten the production cycle in the injection molding.
PS is amorphous polymers, molding shrinkage of small, dimension stability is good. PS bibulous rate is low, the general products can directly instead of dry processing. But for the appearance of the products of the high quality requirements, needs in the 60 - before molding Under the 80 ℃ drying time appropriately, remove the free moisture of raw materials. Because of the PS molecular chain rigidity, very brittle, thermal expansion coefficient is larger than the metal, so products should not be with a metal insert, lest produce stress and cracking around the insert. If you must with a metal insert, QuanJian had better use copper or aluminum, and preheated. In addition, in the product design, if no special needs, should avoid a right Angle, acute Angle, gap, etc.
PS = = volume resistivity and surface resistivity is high. Dielectric loss tangent value is extremely low, and is not influenced by frequency and temperature, are excellent electrical insulating materials. In addition, because of the PS depolymerization, start of the 300 ℃ or more volatile monomers can prevent the surface carbonization, therefore also has the good arc resistance. But because of the PS heat resistance is poor, limit its some applications in electrical. At different polymerization methods of PS, bulk polymerization of PS minimum content of impurities, thus better performance.
in shaping, PS melt into the cavity by a higher shear, macromolecule is easy to produce orientation in the direction of the material flow, if the orientation of macromolecule in internal stress relaxation elder freezing can make the products. With the internal stress of products is easy to produce silver lines or cracking, especially under certain environmental media is more serious. To eliminate internal stress of products, in addition to adjust the mold temperature, melt temperature and the process parameters such as the holding time, still can heat treatment was carried out on the products, the products in the 60 - 80 ℃ hot water, or let stand 1 - drum wind drying oven 4 h, and then slowly cooled to room temperature. Orientation in the process of the macromolecular chain relax, so as to reduce or eliminate the internal stress of injection molding processing products.
more excellent articles: styrene monomer polymerization, click directly.
http://www。 csssld。 cn//html/2017/Info_1001/688。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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