Shanghai Daoqin Plastics Co., Ltd.

一） plastics viscosity and degree viscous for parts strip/profile effect/influence melt plastics 流之子 separation large 时动间 versus scratch property is plastics viscous property.而 this type of viscous property 称数系 small large is viscosity, therefore viscosity is melt plastics flow property high low 反映. viscosity large, melt viscous property strong/high, flow property 越差, processing difficult. industrial application upper, comparison types property material 塑并不 is its viscosity value,而 is its melt flow large small (称MFI): 谓MFI,就 is temperature 化熔定一 in degree lower, melt to pressure function lower, mono time inner (generally is 10 separation 钟) through standards melt weight.以g/10min table/sheet 示,如 injection molding parts grade PP material, grade different,MFI value can from 2.5~30间变化,并 degree viscous material non formed 不变, plastics features 变化, outer temperature degree, pressure parts strip/profile and other force 响,都 can formed viscosity 变化. 1.1 molecular weight effect/influence molecular weight large,越布 separation amount separation narrow,反映出 viscosity large. 1.2 low separation add effect/influence low separation drop can add low large separation between function force.因而 make viscosity decrease small, has type formed material add solvent or increase agent is is reduce viscosity, make easy molding. 1.3 temperature degree viscosity effect/influence temperature degree for large more material melt viscosity effect/influence is very large, generally temperature degree rise high,反映出 viscosity low,但 various degree viscous material reduce degree large small has 出入: PE/PP type plastics, rise high for degree temperature high flow property, reduce melt viscosity function very small, temperature degree high,消 consumption add large,反而 不偿失 PMMA/PC/PA type and other plastics, temperature degree rise 著显就 degree viscous high decline,PS ABS rise high temperature degree for/regarding formed degree viscous low drop type has relatively large benefits 1.4剪切 speed degree effect/influence has 效 剪 material add increase speed degree can make plastics viscosity decline ．