Shanghai Daoqin Plastics Co., Ltd.

        摘 need: polyamide (PA) (PA) is already inner amine, 脂肪羧 acid, amine or aromatic binary acid, aromatic binary amine is raw materials combined formed, upper has amine 基团(—NHCO—) crystallization property polymer/macromolecule combined material, as is engineering plastics PA molecular weight in (1.5~3)×104 left right. PA tool has excellent force property can, wear resistance and high temperature resistance property, therefore is applications most is engineering plastics 之一. 但 is, due to separation structure in has property hydrophilic water 基团, therefore for nylon products dimensional stability and force property can has very large effect/influence. currently, can use fiber reinforcement, reduce resin water absorption, make its can in high temperature, high wet conditions lower as.

nylon 阀门

        一, water property for nylon property can effect/influence mechanism

         due to nylon separation structure 规整, is type crystallization property polymer/macromolecule combined material, 晶格 存 in separation 子链 运动, therefore strong/high degree relatively high. in addition, separation in has property amine 基团, can in separation between formed hydrogen 键, make separation 子链之 front function force increase large, 进一步限 made separation 子链受 outer force slip 移, therefore tool has relatively high force strong/high degree and modulus.

         and, polyamide (PA) separation in amine density increase, separation for property reinforcement and crystallization degree improve/increase, its force strong/high degree 也进一步 improve/increase.

        1, separation 子链间 function force reduce

        但 is, positive is nylon separation in has property amine 基团, therefore can and ring in water separation formed hydrogen 键, this make separation 子链 规整 degree reduce, separation between hydrogen decrease/reduce, separation between function force reduce.

         therefore, in to outer force 时, separation between can through 运动 消 consumption outer can amount, therefore material tensile strength, flexural strength and modulus has 一定程 degree reduce , products dimensional stability large reduce. is elongation and impact strong/high degree has improve/increase .

        2, separation 子链部 separation hydrolysis

         in melt lower, if has water separation in, 会引起 polyamide (PA) large separation hydrolysis, from 而导致 versus for separation quality reduce. is polymer/macromolecule combined material mechanical properties and separation material 子一定 scope/range inner is positive ratio 关系, therefore separation degradation, products force property can 会出现 decline.

         in addition, molding process in, water separation in also 会导致 products surface bubbles, silver streaks and and other defect. therefore, molding front must separation drying.

        二, water absorption for nylon force property can effect/influence

table/sheet nylon dry force property can testing

注: standards using/adopting ASTM standards methods

table/sheet water property for nylon force property can effect/influence

注: standards using/adopting ASTM standards methods

         upper table/sheet is types nylon in dry and water absorption lower force property can testing data comparison. types nylon tensile, flexural strength, and modulus has 一定程 degree reduce, elongation and impact strong/high degree has improve/increase.

         comparison various types nylon in types lower fracture rise strong/high degree, aliphatic nylon water rear tensile strength reduce degree relatively, its in PA46 drop in 40% left right, aromatic nylon PAMXD-6 drop in 10% left right.

         therefore, for/regarding nylon products 说, not only in molding process in need 进行考虑吸 wet property issues, use process in, especially is high temperature, high wet ring in 也 考虑 water absorption issues. currently, glass fiber reinforced nylon can obvious modified products wet property, can make nylon products used for high temperature, high wet ring in.