New developped PVC extrusion profile for power socket rail
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polycarbonate
by：CSSSLD
2021-02-03
PC is a kind of non-toxic, tasteless, odourless, transparent amorphous thermoplastic polymer, the density of 1.
2g/cm³
, bibulous rate is less than 0.
2%.
Slowly and from self-extinguishing fire, burning when molten, foaming, accompanied by rotting fruit smell taste.
PC can be in the injection molding processing factory made of transparent, translucent, and opaque products.
PC is a typical hard and toughening of the polymer, excellent mechanical properties, notably his impact strength, PA3 times higher, belongs to the impact strength excellent varieties of engineering plastics.
industrial production of bisphenol A type PC mainly adopts phosgene method and ester exchange method, is given priority to with phosgene method. According to the different polymerization methods, also used two kinds of monomer: phosgene and diphenyl carbonate. Phosgene method is divided into two kinds of interfacial polycondensation and solution polycondensation. Interfacial polycondensation is to A certain proportion of bisphenol A (bpa), sodium hydroxide solution, catalyst, molecular weight regulator and solution in reaction kettle, interesting pressure phosgene wide vaporization and condensation reaction.
it is amorphous structure, each PC has good transparency, can be used as a transparent material. But if the crystallization condition at the right moment, PC can also crystallization, after heat treatment was carried out on the PC products in the production of transparency and toughness drops it is for this reason. The relative molecular mass of the PC larger influence on its performance and forming. The relative molecular mass increase the mechanical properties. The relative molecular mass of the ester exchange method usually PC in 2. 50000 - Between 30000, relative molecular mass of the phosgene method PC range wide, general control within 100000. High relative molecular mass, has not significant on the improvement of the mechanical properties, can bring difficulties to processing.
ester exchange method is in the presence of alkaline catalyst, called bisphenol A and diphenyl carbonate in under conditions of high temperature and high vacuum melting polycondensation. The technological process is simple, don't use solvent polymerization, products do not need post-processing, can get products direct extrusion granulation. Because the reactant material viscosity is higher, material mixing and heat dissipation difficulties, difficult to produce high relative molecular mass of PC resin. At the same time, the reaction should be carried out under high temperature, high vacuum, thus higher requirements to the equipment.
because there are a soft carbonate in the main chain and the benzene ring of rigidity, the characteristics of macromolecular structure make the PC shows sofe. Phenylene constitutes the rigid part of the main chain, PC brings out the high mechanical strength, high heat resistance and dimensional stability. But the existence of phenylene hindered the macromolecular orientation and crystallization, when from external force orientation and not easy to loose, cause it is difficult to eliminate residual stress, easy cause products produce stress cracking phenomenon. Rigid groups also hindered the relative sliding motion between molecules, making it melt temperature, melt viscosity.
polycarbonate is developed in the late 1950 s important thermoplastic engineering plastic, production is second only to PA. Excellent balance and mechanics, heat and electric properties, especially the impact strength is a regular thermoplastics. Easy processing, can be made a variety of methods such as injection molding, extrusion products. Containing carbonate (PC) is a kind of main chain link base polymer, usually according to the structure unit of the group are divided into aromatic, aliphatic and fat - Aromatic three categories. As A variety of engineering plastics mainly bisphenol A type of aromatic PC.
oxygen radicals makes chain segment is easy to revolve around the single bond occurred within the given macromolecular chain must be flexible, which is one of the reasons for the injection molding processing PC with high impact strength. Ester base is polar group thus weakened the stability of PC in organic solvent, make it is soluble in polar organic solvents, and electrical insulating properties of PC as non-polar PE and the basic cause of hydrolysis more easily. PC macromolecular chain have symmetry and regularity, theoretically has crystallization ability. But, because of the large PC rigid macromolecular chain forming die temperature of glass transition temperature is higher than products, forming the reduced to below the glass transition temperature, melt temperature quickly become amorphous to crystalline products completely.
more excellent articles: thermal and chemical properties of the polyamide - click directly.
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changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
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industrial production of bisphenol A type PC mainly adopts phosgene method and ester exchange method, is given priority to with phosgene method. According to the different polymerization methods, also used two kinds of monomer: phosgene and diphenyl carbonate. Phosgene method is divided into two kinds of interfacial polycondensation and solution polycondensation. Interfacial polycondensation is to A certain proportion of bisphenol A (bpa), sodium hydroxide solution, catalyst, molecular weight regulator and solution in reaction kettle, interesting pressure phosgene wide vaporization and condensation reaction.
it is amorphous structure, each PC has good transparency, can be used as a transparent material. But if the crystallization condition at the right moment, PC can also crystallization, after heat treatment was carried out on the PC products in the production of transparency and toughness drops it is for this reason. The relative molecular mass of the PC larger influence on its performance and forming. The relative molecular mass increase the mechanical properties. The relative molecular mass of the ester exchange method usually PC in 2. 50000 - Between 30000, relative molecular mass of the phosgene method PC range wide, general control within 100000. High relative molecular mass, has not significant on the improvement of the mechanical properties, can bring difficulties to processing.
ester exchange method is in the presence of alkaline catalyst, called bisphenol A and diphenyl carbonate in under conditions of high temperature and high vacuum melting polycondensation. The technological process is simple, don't use solvent polymerization, products do not need post-processing, can get products direct extrusion granulation. Because the reactant material viscosity is higher, material mixing and heat dissipation difficulties, difficult to produce high relative molecular mass of PC resin. At the same time, the reaction should be carried out under high temperature, high vacuum, thus higher requirements to the equipment.
because there are a soft carbonate in the main chain and the benzene ring of rigidity, the characteristics of macromolecular structure make the PC shows sofe. Phenylene constitutes the rigid part of the main chain, PC brings out the high mechanical strength, high heat resistance and dimensional stability. But the existence of phenylene hindered the macromolecular orientation and crystallization, when from external force orientation and not easy to loose, cause it is difficult to eliminate residual stress, easy cause products produce stress cracking phenomenon. Rigid groups also hindered the relative sliding motion between molecules, making it melt temperature, melt viscosity.
polycarbonate is developed in the late 1950 s important thermoplastic engineering plastic, production is second only to PA. Excellent balance and mechanics, heat and electric properties, especially the impact strength is a regular thermoplastics. Easy processing, can be made a variety of methods such as injection molding, extrusion products. Containing carbonate (PC) is a kind of main chain link base polymer, usually according to the structure unit of the group are divided into aromatic, aliphatic and fat - Aromatic three categories. As A variety of engineering plastics mainly bisphenol A type of aromatic PC.
oxygen radicals makes chain segment is easy to revolve around the single bond occurred within the given macromolecular chain must be flexible, which is one of the reasons for the injection molding processing PC with high impact strength. Ester base is polar group thus weakened the stability of PC in organic solvent, make it is soluble in polar organic solvents, and electrical insulating properties of PC as non-polar PE and the basic cause of hydrolysis more easily. PC macromolecular chain have symmetry and regularity, theoretically has crystallization ability. But, because of the large PC rigid macromolecular chain forming die temperature of glass transition temperature is higher than products, forming the reduced to below the glass transition temperature, melt temperature quickly become amorphous to crystalline products completely.
more excellent articles: thermal and chemical properties of the polyamide - click directly.
http://www。 csssld。 cn//html/2017/Info_1017/701。 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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