Polypropylene/extra high molecular weight polyethylene in-situ fibre-formed cocrystallized composite material

Abstract

The polypropylene (PP) / ultrahigh molecular weight polyethylene (UHMWPE) in-situ fiber-forming cocrystallized composite material is amde up by uisng PP and UHMWPE through the processes of comixing, in-situ fiber-forming and cocrystillzation. The mass ratio of PP and UHMWPE Is 100 / 5-100 / 20. When the relative molecualr weight of UHMWPE is 100-300X10 to the minus fourth, its effect is better, when PP is one of PPB (block copolymer polypropylene) or PPR (radom copolymer polyropylene, its effect is better, and when PP is PPB, its effect is best, and when the mass ratio of PP and UHMWPE is 100 / 10, its effect is best. The strength and toughness of said invented product are greatly raised, and its bending strength, heat resistance and weatherability can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of macromolecular synthetic materials, and more specifically relates to a polypropylene / ultrahigh molecular weight polyethylene in-situ fiber-forming co-crystal composite material modified by blending ultrahigh molecular weight polyethylene and polypropylene. Background technique [0002] PP (polypropylene) is a general-purpose resin of large varieties, and its output and consumption rank among the top three of general-purpose resins of large varieties, and its uses are very extensive. At present, the transformation of various domestic pipes from metal materials to plastic materials has become the general trend. The application of pipes involves various fields of national economy and national defense construction such as urban construction, enterprises, mines, communications, and energy. PP is one of the most widely used varieties of plastic pipes, and its proportion is increasing. H...

AI Technical Summary

Problems solved by technology

However, the strength, toughness, low temperature resistance and other comprehensive physical and mechanical properties and extrusion process performance of domestically produced PP materials still need to be improved, and there is still a certain gap compared with foreign countries.

Although PP materials imported from abroad have better technical performance, they are very expensive.

In addition, the current PP materials (especially domestic ones) are mainly used in cold and hot water pipes, bottles, cans, films, belts, ropes, etc. , and other extrusion parts, blow molding parts, medical and sanitary appliances, etc. It is not ideal for injection of important parts such as automobiles and household appliances

This is because a single technology is currently used at home and abroad, such as co-crystallization research on different types of polyethylene, and there is no research on co-crystallization behavior and in-situ fiber formation between PP / UHMWPE