Preparation method of ultra-high molecular weight polyethylene fiber

Abstract

The invention relates to a novel production method for preparing a high-strength and high-elongation polyethylene fiber at low energy consumption and low cost. The method comprises the following two steps: 1, preparing a polyethylene modified master batch; and 2, uniformly mixing ultra-high molecular weight polyethylene resin with the prepared polyethylene modified master batch to prepare an ultra-high molecular weight polyethylene melt spinning yarn, wherein the fiber strength of the prepared ultra-high molecular weight polyethylene fiber is 15-25 CN / dtex, and the breaking elongation is 5-8%. The invention has the advantages of short production flow, low energy consumption, environment friendliness, low manufacturing cost and high single-machine productive capacity. Besides, the product can be widely used in various fields such as the cable twisting and weaving field, the fishnet knitting field, the industrial cloth and belt weaving field and the like and the effective use of the fiber strength can be maintained.

Description

technical field [0001] The invention is an innovative production method for preparing high-strength and high-extension polyethylene fibers with low energy consumption and low cost by adopting melt spinning technology for ultra-high molecular weight polyethylene resin. Background technique [0002] Ultra-high molecular weight polyethylene fiber has excellent properties such as high strength, low density, high modulus, strong impact toughness, light resistance, and good corrosion resistance. It is known as the world's three major high-tech fibers (carbon fiber, aramid fiber, super fiber) High-strength polyethylene fiber) is a high-performance new material, and its products are widely used in national defense military equipment, aerospace, special composite materials, marine engineering ropes and fishing nets and other application fields. Its production method public technical indications have the following two categories: [0003] The first category: Dutch patent NL7900990, U...

AI Technical Summary

Problems solved by technology

This kind of technology obtains fiber strength > 30CN / dtex and modulus > 1000CN / dtex. This technology has a high degree of industrialization at home and abroad and mature technology, but it has long production process, high energy consumption and material consumption, high manufacturing cost, and low sales price. High disadvantages, market demand is already at the bottleneck

[0008] The second category, China's published patent CN101230501A shows that the technology of preparing high-strength polyethylene fibers by blending and melting ultra-high molecular weight polyethylene and low-density polyethylene, which uses ultra-high molecular weight polyethylene with a molecular weight of 1.2 to 1.8 million The molecular weight is 2.5-40,000, and it is spun by twin-screw melt extrusion at a mixing ratio of 10:1. The fiber strength is 15-30g / D, the modulus is 400-1000g / D, and the elongation at break is 2.5%-3.5%. This technology uses two kinds of raw materials to mix and mix, and there is a huge difference in molecular weight distribution, resulting in extremely small fiber elongation (2.5% to 3.5%). For example, multiple twisting in the production of ropes, fishing net weaving, industrial cloth weaving and other fields will lead to Defects such as high strength and loss (the strength loss will reach 30% to 60%), it is not suitable for wide application in the fields of ropes, fishing nets, etc.