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Chemical modification
by：CSSSLD
2021-02-03
Three kinds of additives after the curves of the tensile strength of the PP and PE is similar to the curves of the tensile strength of the overall trend.
Modification of the impact strength of PP greatly improve the injection molding processing, adding glass fiber effect is very good, adding ultrafine glass bead is very poor, add needle silica fume Shi Jie in between, in addition, PE add three kinds of additives, impact strength, constantly.
Due to the strength of the glass fiber is higher than needle-like wollastonite, after the modification of PP, PE tensile strength, impact strength is higher also.
after oxide crosslinked ultra-high molecular weight polyethylene in structure and thermoplastics, thermosets and vulcanized rubber is different, he has a body shape is not completely crosslinking structure, therefore, both in the performance of the three characteristics, that is to say at the same time has a thermoplastic, high hardness, good toughness and resistance to stress cracking resistance. After adding dicumyl peroxide crosslinking, increase the impact strength of ultra-high molecular weight polyethylene, thermal deformation temperature is increased slightly, abrasion resistance decreased but not as much.
when adding ultrafine glass bead PP elongation and the tensile yield strength are slightly smaller than add needle-like wollastonite, glass fiber. When adding needle-like wollastonite PP elongation and the tensile yield strength between adding ultrafine glass bead and glass fiber. PP when adding glass fiber elongation and the tensile yield strength were slightly better results than the other two kinds of additives. Three kinds of additives after the tensile strength of PE are higher than that of PP. Three kinds of additives of PE after elongation are higher than that of PP.
if you need to increase the friction coefficient, lower elastic modulus increase elasticity, can add rubber, polyurethane to satisfy this requirement. Ultra-high molecular weight polyethylene is mainly using two kinds of silane coupling agent: one is the vinyl siloxane, another kind is allyl siloxane. Coupling agent typically triggered by peroxide, commonly used is DCP, organic tin derivatives commonly used catalysts. Forming process of silane crosslinked ultra-high molecular weight polyethylene is first and foremost make peroxide thermal decomposition for the high chemical activity of free radicals, these free radicals take polymer molecules of hydrogen atoms to make owner chain polymerization active free radicals, and then with silane grafting reaction, after grafting of ultra-high molecular weight polyethylene under the action of water and silanol condensation catalyst hydrolytic condensation, forming crosslink bond for a quick silane crosslinked ultra-high molecular weight polyethylene.
in the electronic radiation dose or Y rays, under the action of ultra-high molecular weight polyethylene molecules a part of the main chain or side chain may be ray cut off, a certain number of free radicals, these free radicals, each other to form crosslinking chain made of ultra-high molecular weight polyethylene linear structure into a mesh of macromolecular structure. After a certain dose irradiation, ultra-high molecular weight polyethylene creep resistance, wear resistance and hardness are improved and improvement.
chemical modification is commonly said chemical crosslinking, chemical crosslinking is divided into peroxide crosslinking, coupling agent, crosslinking and radiation crosslinking, this is the main way that chemical modification. Chemical crosslinking modification methods to improve liquidity injection molding processing of ultra-high molecular weight polyethylene, increase the heat distortion temperature, improve the wear resistance and strength etc. Peroxide crosslinking with peroxide as cross-linking agent to modification of ultra-high molecular weight polyethylene, ultra-high molecular weight polyethylene under the effect of peroxide produce free radicals, free radical crosslinking coupling.
physical modification generally refers to the filler modification, also called blending modification. In order to improve the performance of the plastic material, he is commonly used in scientific research, production and processing of a modified method. This method can be simple and convenient to meet and improve plastic different performance requirements, most physical modification to improve the performance of the material at the same time also can reduce the cost, is now widely used. Adding glass beads can improve the wear resistance, thermal deformation temperature of 40 ℃ can be improved. The above four kinds of fillers are made of ultra-high molecular weight polyethylene has decreased the impact strength.
more excellent articles: twin screw extruder and the second out, click directly.
http://www。 csssld。 cn//html/2016/Info_1214/432。 HTML
nantong on suye's official website: http://www. csssld。 cn//
after oxide crosslinked ultra-high molecular weight polyethylene in structure and thermoplastics, thermosets and vulcanized rubber is different, he has a body shape is not completely crosslinking structure, therefore, both in the performance of the three characteristics, that is to say at the same time has a thermoplastic, high hardness, good toughness and resistance to stress cracking resistance. After adding dicumyl peroxide crosslinking, increase the impact strength of ultra-high molecular weight polyethylene, thermal deformation temperature is increased slightly, abrasion resistance decreased but not as much.
when adding ultrafine glass bead PP elongation and the tensile yield strength are slightly smaller than add needle-like wollastonite, glass fiber. When adding needle-like wollastonite PP elongation and the tensile yield strength between adding ultrafine glass bead and glass fiber. PP when adding glass fiber elongation and the tensile yield strength were slightly better results than the other two kinds of additives. Three kinds of additives after the tensile strength of PE are higher than that of PP. Three kinds of additives of PE after elongation are higher than that of PP.
if you need to increase the friction coefficient, lower elastic modulus increase elasticity, can add rubber, polyurethane to satisfy this requirement. Ultra-high molecular weight polyethylene is mainly using two kinds of silane coupling agent: one is the vinyl siloxane, another kind is allyl siloxane. Coupling agent typically triggered by peroxide, commonly used is DCP, organic tin derivatives commonly used catalysts. Forming process of silane crosslinked ultra-high molecular weight polyethylene is first and foremost make peroxide thermal decomposition for the high chemical activity of free radicals, these free radicals take polymer molecules of hydrogen atoms to make owner chain polymerization active free radicals, and then with silane grafting reaction, after grafting of ultra-high molecular weight polyethylene under the action of water and silanol condensation catalyst hydrolytic condensation, forming crosslink bond for a quick silane crosslinked ultra-high molecular weight polyethylene.
in the electronic radiation dose or Y rays, under the action of ultra-high molecular weight polyethylene molecules a part of the main chain or side chain may be ray cut off, a certain number of free radicals, these free radicals, each other to form crosslinking chain made of ultra-high molecular weight polyethylene linear structure into a mesh of macromolecular structure. After a certain dose irradiation, ultra-high molecular weight polyethylene creep resistance, wear resistance and hardness are improved and improvement.
chemical modification is commonly said chemical crosslinking, chemical crosslinking is divided into peroxide crosslinking, coupling agent, crosslinking and radiation crosslinking, this is the main way that chemical modification. Chemical crosslinking modification methods to improve liquidity injection molding processing of ultra-high molecular weight polyethylene, increase the heat distortion temperature, improve the wear resistance and strength etc. Peroxide crosslinking with peroxide as cross-linking agent to modification of ultra-high molecular weight polyethylene, ultra-high molecular weight polyethylene under the effect of peroxide produce free radicals, free radical crosslinking coupling.
physical modification generally refers to the filler modification, also called blending modification. In order to improve the performance of the plastic material, he is commonly used in scientific research, production and processing of a modified method. This method can be simple and convenient to meet and improve plastic different performance requirements, most physical modification to improve the performance of the material at the same time also can reduce the cost, is now widely used. Adding glass beads can improve the wear resistance, thermal deformation temperature of 40 ℃ can be improved. The above four kinds of fillers are made of ultra-high molecular weight polyethylene has decreased the impact strength.
more excellent articles: twin screw extruder and the second out, click directly.
http://www。 csssld。 cn//html/2016/Info_1214/432。 HTML
nantong on suye's official website: http://www. csssld。 cn//
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