Preparation method for high-strength polyethylene fibers with net structures

Abstract

The invention relates to a preparation method for high-strength polyethylene fibers with net structures by the aid of high-density polyethylene. The method includes following steps of a, efficiently shearing and uniformly mixing the high-density polyethylene and paraffin wax in a mixing kettle, adding a radiation sensitive agent, injecting mixture into a double-screw melt extruder and preparing uniformly diced particles after extrusion forming; b, feeding the diced particles into a melt spinning machine, performing defoaming extrusion, spinning via a spinning jet, leading the diced particles into a shock chilling environment to be condensed and shaped, then leading the diced particles into dimethylbenzene solvent bath with a drafting assembly to extract, leading fibers to draft and orientate, and preparing semi-finished polyethylene fiber yarns; and c, placing the semi-finished yarns in a radiation environment with the radiation dosage of 80-150kGy to be treated, then leading the semi-finished yarns to pass through a temperature gradient heat treatment channel and draft, and finally obtaining the high-strength polyethylene fibers with the net structures. The high-strength polyethylene fibers have ultra-high strength and good strain, and are more suitable for textile processing as compared with special fibers such as aramid fibers, carbon fibers, ultrahigh modulus polyethylene fibers and the like.

Description

technical field [0001] The invention belongs to the field of textile materials, in particular to a method for preparing high-strength polyethylene fibers with a network structure by using high-density polyethylene. Background technique [0002] In recent years, the main reason why spider silk has become the focus of attention is its unique mechanical properties and environmental protection advantages. In terms of mechanical properties, it has outstanding advantages that silk and general synthetic fibers cannot match. At present, spider silk fibers and carbon fibers with the highest strength on the market The strength is close, but it has obvious advantages in toughness, and a rope composed of spider silk is stronger than a stainless steel bar of the same thickness, and can bear 5 times more weight than a steel bar without being broken. It has excellent elasticity and strength, its strength is obviously higher than that of silk, rubber, and synthetic fibers, similar to that o...

AI Technical Summary

Problems solved by technology

[0003] With the help of advanced structural characterization methods and biotechnology, the research on spider silk mainly focuses on transgenic technology and the use of appropriate bionic spinning technology for spinning. At present, the results are not ideal. With the development of biological science and polymer science, Through transgenic technology and simulating the spinning behavior of spiders, it is still in the research stage to obtain a large amount of spider silk protein and artificially spin spider silk with excellent performance

[0004] In addition, the high performance, high function and high sensitivity of fibers have always been the focus of researchers' research on new chemical fiber materials. High performance polyethylene fiber is a new type of fiber material with extremely important strategic significance after carbon fiber and aramid fiber. High performance fiber material Due to its excellent mechanical properties, it is often used as a reinforcement material for composite materials, including: glass fiber, which has high strength and good heat resistance and chemical corrosion resistance, but glass fiber is brittle and has poor compression resistance. The denaturation ability of the fabric is poor; carbon fiber has good high temperature resistance and chemical corrosion resistance, but carbon fiber is brittle and difficult to weave; aromatic polyamide fiber aramid has good mechanical properties and stability, but it is a fibrillation structure. During the weaving process, the warp and weft yarns are subject to repeated stretching, bending, friction, etc., and fibril splitting will occur, which brings great trouble to weaving and forming, and the cost of materials is relatively high; high-strength and high-modulus polyethylene The fiber density is small, it has high strength and modulus, and the softness of the fiber is good, and it has good fatigue resistance and friction resistance. However, due to the small elongation at break of the high-strength high-modulus polyethylene fiber, it is easy to appear in the weaving process. The phenomenon of warp and weft breaking makes it difficult to weave into shapes. Therefore, it is particularly important to prepare a high-performance special polyethylene fiber