Shanghai Daoqin Plastics Co., Ltd.

 

MFI full is “ melt flow index ”, is plastics processing field/area commonly used indicators 之一, mono PP一 type resin has upper types different Model/Grade, MFI formed large 家挑选 grade important based on. that 么, its for products types types effect/influence, below/following 五点, belt/tape comprehensive understanding “ MFI ” to is what!

 

what is “ melt flow index ”

melt flow index （ＭI）: thermoplastic property plastics in temperature degree and pressure lower, melt in separation inner through standards fine tube/pipe weight value, 以（g/10min） table/sheet 示. MI value large, raw materials viscosity and molecular weight low, processing properties good, flow property good; versus 反, MI value small, raw materials viscosity and molecular weight large, processing properties 越差, flow property 越差, material mechanical properties relatively high.

 

同 types grade raw materials in more processing use rear 都会导致 its molecular weight reduce, from increase large melt flow rate, products material mechanical properties 变差, this is is what recycled plastics melt flow rate large main/primary causes.

 

adjustment MFI methods

and type different MFI grade blending, can in 一定程 degree upper raw materials MFI;

 

添 add crosslinked agent, ratio has machine oxidation material, add amount in per mille left right, this type of methods for force property can effect/influence comparison large;

 

add a small amount of filler, ratio micron grade carbon acid 钙, can reduce MFI, this type of methods can improve/increase force property can;

 

has types MFI adjustment agent additives, also is polymer/macromolecule adhesion agent. is for polyolefin product separation structure mechanism development made type polyolefin product processing modifier, through multiple bonding technology will polyolefin polymer/macromolecule has poly 集起, from increase polymer/macromolecule 链段间 吸引 force （即范德华 force ）, through this modified process make already separation degradation polyolefin product property can to front property can, according to add amount different mono property can also can large degree improves.

 

MFI for products effect/influence

 

melt flow index is table/sheet raw materials in screw inner flow speed rate parameters, in to 定剪切 force lower polymer flow degree, and force and temperature degree has 关.

 

MFI high material in extrusion machine and screw friction coefficient versus for relatively small, 因而产出 amount versus for relatively less.

high MFI material generally lower relatively more, for machine pressure large, easy formed 网堵塞.