Jelly spinning polyethylene/epoxy resin composite fiber and its preparing method

Abstract

The present invention discloses a kind of freezing spun composite polyethylene / epoxy resin fiber and its preparation process. The freezing spun composite polyethylene / epoxy resin fiber is prepared with powdered ultrahigh molecular weight polyethylene in average molecular weight greater than 1 MDa in 100 weight portions, epoxy resin in 1-10 weight portions, curing agent in 0.01-1 weight portions, antioxidant in 0.1-5 weight portions and antioxidant assistant in 0.01-2 weight portions. The present invention is superior in that the epoxy resin as modifier has excellent performance and few damage on ultrahigh molecular weight polyethylene and the freezing spun composite polyethylene / epoxy resin fiber may be produced in available ultrahigh molecular weight polyethylene fiber producing apparatus after slightly improvement.

Description

technical field [0001] The invention relates to a gel-spun polyethylene / epoxy resin composite fiber and a preparation method thereof, in particular to a gel-spun ultrahigh molecular weight polyethylene / epoxy resin composite fiber. Background technique [0002] As we all know, ultra-high molecular weight polyethylene (abbreviated as UHMWPE, the same below) fiber is made of ultra-high molecular weight polyethylene, which is dissolved in a solvent, quenched, spun jelly yarn, extracted, dried, and thermally super-stretched in sections. A novel special fiber made by such process. This fiber has excellent properties such as light weight, high strength, high modulus, UV resistance, impact resistance, seawater corrosion resistance, and electrical insulation. It has broad application prospects in military, aviation, aerospace, marine engineering, and sports equipment. However, due to the large molecular weight of UHMWPE, as high as 1 million or more; the molecular chain is very long...

AI Technical Summary

Problems solved by technology

For chemical cross-linking, after UHMWPE is added with an appropriate cross-linking agent, cross-linking occurs during the melting process. Since UHMWPE has a large molecular weight, it is not easy to melt, and there are no polar groups on the molecular chain, so chemical cross-linking is not easy. The effect of modification is not very obvious, and degradation reaction will occur during the crosslinking process, which will reduce the performance of UHMWPE

Therefore, the method of radiation cross-linking is mainly used now, and high-energy radiation is used to generate transverse cross-links between molecular chains. This can improve the heat resistance and creep resistance of UHMWPE fibers to a certain extent, but it cannot be used during the cross-linking process. To avoid chain scission degradation, as the radiation dose increases, the degree of degradation also increases, and the tensile strength and elongation at break of the fiber are reduced after crosslinking. In addition, the process is more complicated

[0006] UHMWPE is filled and modified with fillers such as glass beads, mica, talc, silica, alumina, molybdenum disulfide, carbon black, etc. Since UHMWPE is a high-toughness material, the added fillers form physical crosslinking points , which restricts the thermal movement of molecules, can improve its heat resistance and creep resistance, but after adding these inorganic fillers, the fluidity of UHMWPE becomes worse and it is more difficult to process

[0007] Mixing UHMWPE fiber with carbon fiber, glass fiber and Kevlar fiber can also improve its heat resistance and creep resistance, but because there is no polar group on the UHMWPE molecular chain and the surface is smooth, it cannot form a compatible interface with the mixed fiber , a good force cannot be formed between the two components, and the addition of these fibers will also make the fluidity of UHMWPE poor and difficult to process

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