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material material injection molding front drying, 行不行?
凡事 in plastics industry mixed year 人都知道, if product need has good appearance, drying, mold temperature, material temperature is important indicators.
我们接触 朋友 large more is electronics electrical appliances and 3C product, and material 以ABS, PC, PC/ABS, nylon, PBT and other more. large in injection molding front requirements injection molding according to Data Sheet or requirements will material separation drying.
不, very more 朋友就像我们 in training upper 发现, for/regarding which material drying, which can drying, is understanding. large 家平时 use certain material is this material, has use large 清楚.
我们身 in plastics industry, inner toward is 渴望知道 more more 一, for 事情应该知 its 然, also need its therefore 然, this can in that performance more good degree, is this 样 吧?
is this issues, need from it combined formed methods 讲起.
lower is nylon 66:
nylon 66 combined formed is through this types polycondensation reaction to. polycondensation generally is above different separation 子手拉手经 more shrink combined large separation reaction.
this category of reaction features is:
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reaction can 逆
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has low separation 子副产 material （ ratio water, alcohol and other ）
-
polycondensation material molecular weight is mono 体 整数倍
large 家想一想: if material has water separation
一方面, water formed water gas, in product surface formed gas marks, material 花
2
另一方面, according to basic chemical principle, this reaction toward and other left 边移动, nylon separation understanding molecular weight small. injection molding 时, 炮筒里面 also is high temperature, also is high pressure, more add nylon separation understanding process.
3
polymer/macromolecule material property can and molecular weight 关系密切. lower can to, molecular weight reduce 时, material strong/high degree decline. this is 我们看 to material property can bad.
我们 usually use material PC, PA, PET, PBT and other is through polycondensation reaction combined formed. therefore, it in injection molding front is need drying.
不, if has 做家居 product can can 会提出“做 plastics sheet/plate 凳, plastics generally PE, PP use more, it in injection molding good can use drying ”.
is, PP, PE in injection molding front can drying.
lower is polyethylene (PE), polypropylene (PP):
this type of combined formed polymer/macromolecule methods and nylon different, it add formed polymerization （简称 addition polymerization reaction ）.
addition polymerization mono 体（ mono is can and types or types separation polymerization small separation 子 统称） is has di or 三键, 键打开 rear, versus 互连接起, formed polymer/macromolecule.
this category of reaction features is:
-
structure mono and mono same
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due to has material
-
polymer molecular weight is mono 体 整数倍.
PE, PP, PS, PMMA, POM and other is through addition polymerization reaction combined formed.
明白 this material is how, in use 时候就 can more add 心应手.
