Preparation method of ultra-high molecular weight polyethylene fiber

Abstract

The invention discloses a preparation method with low energy consumption and low cost for high-strength and high-extension ultrahigh molecular weight polyethylene fiber. The method comprises two steps: firstly, preparing modified polyethylene master batch; and secondly, adding the prepared modified polyethylene master batch to a selected ultrahigh molecular weight polyethylene resin, uniformly mixing to prepare ultrahigh molecular weight polyethylene, and further performing melt spinning. The prepared ultrahigh molecular weight polyethylene fiber has fiber strength of 15CN / dtex-25CN / dtex and elongation at break of 5%-8%. The method disclosed by the invention has the advantages of short production flow, low energy consumption, environmentally friendly, low manufacturing cost, high standalone capacity and the like. The produced product can be widely used in the fields such as twist-knitting various ropes, braiding fishnets and weaving various industrial cloth, industrial belts and the like, and it can effectively retain high fiber strength while being used.

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.