Preparation method of high modulus polyethylene fiber

Abstract

The invention provides a preparation method of a high modulus polyethylene fiber. The preparation method is characterized by mixing and swelling 5-10 parts by mass of ultra-high molecular weight polyethylene, 0.5-5 parts by mass of low density polyethylene, 0.01-0.04 part by mass of spinning aid and 100 parts by mass of organic solvent; after a formed polyethylene organic solution is fully dissolved by a double-screw extruder, enabling a gel fiber extruded by a spinneret plate to enter a flash evaporation heating zone heated by water vapor, and carrying out quick flash evaporation on the organic solvent in the gel fiber to form a solid protofilament; after shock cooling of the solid protofilament in a water bath, carrying out hot stretching by heating with water vapor more than 60 times, thus preparing the high modulus polyethylene fiber in a fibrillated net structure. The preparation method has the beneficial effects that a proper amount of low density polyethylene is added, the solid protofilament is subjected to shock cooling in the water bath, and meanwhile, the water vapor is used as a heating and protecting medium to shorten the preparation cycle, thus reducing the production cost and improving the fiber quality.

Description

technical field

[0001] The invention relates to a preparation method of high modulus polyethylene fiber. Background technique

[0002] High modulus polyethylene fiber has excellent properties such as light weight, high strength, non-water absorption, excellent wear resistance, outstanding impact resistance, good low temperature creep resistance, and excellent chemical corrosion resistance. One of the three high-performance fiber materials. It has extremely broad application prospects in the field of low temperature and normal temperature, and has strong market development potential in national defense and industrial and agricultural production.

[0003] At present, the preparation methods of high modulus polyethylene fibers are mainly wet spinning method and dry spinning method.

[0004] The wet spinning method is to use a low-volatile solvent to prepare polyethylene spinning stock solution. The spinning stock solution is extruded from the spinneret hole and enters a water...