Cut-resistant ultra-high molecular weight polyethylene fibers and preparation technology thereof

Abstract

The invention discloses cut-resistant ultra-high molecular weight polyethylene fibers. The cut-resistant ultra-high molecular weight polyethylene fibers consist of ultra-high molecular weight polyethylene, expandable organosilicate clay, modified graphene and an antioxidant, wherein the expandable organosilicate clay accounts for 0.1%-10% of the total mass of the composite fibers; and the modified graphene accounts for 0.1%-5% of the total mass of the composite fibers. The invention provides the technical scheme of preparing cut-resistant fibers by using UHMWPE fibers as bodies (cut-resistant level of fiber bodies only can reach 2 levels or so generally at present), the technological process is simple, the cut resistance of the fibers which are not combined to other hard fibers can be good, and therefore, the comfort level of fiber products is improved.

Description

technical field [0001] The invention relates to a technology for preparing ultra-high molecular weight polyethylene composite fibers by adopting a solution spinning method, and belongs to the field of high-performance fibers. Background technique [0002] Ultra-high molecular weight polyethylene fiber is one of the three high-tech fibers. It is the fiber with the highest specific strength that has been commercially produced. It is mainly used in safety protection, aviation, weapons, sports and other fields. Ultra-high Molecular Polyethylene (UHMWPE for short) refers to linear polyethylene with an average molecular weight greater than 1.5 million. Its chain structure is a typical linear structure with very few branched chains, which is far lower than that of ordinary polyethylene. The branch point is less than 1 / 1000, and the macromolecular chain is super long, reaching tens of thousands of nanometers. Therefore, it is the best choice for preparing flexible chain high-strengt...

AI Technical Summary

Problems solved by technology

The patents considered to improve the cutting resistance of raw material fibers include CN102828312A, JP2004-19050, WO2008 / 046476, CN102037169A, CN102227524A, etc., among which high-strength fibers such as high-molecular-weight polyethylene, high-symmetric structure polyamide, and polybenzoxazole are used together with inorganic Metal or glass fiber forms a composite fiber with a core / skin, or wraps it with high-elastic fiber, or coats it with hard mineral powder to achieve the goal of improving cutting resistance, but the addition of inorganic metals and glass fibers will cause body sensation Hardening makes people feel uncomfortable; patent CN 102037169A (Toyobo) discloses a low molecular weight (50,000-300,000) polyethylene plus a cross-linking agent to achieve the goal by free radicals causing cross-linking to form a network structure, but This method is melt spinning, and the controllability of forming cross-linked chain gel at high temperature is not easy in the operation of the process, and the follow-up still needs to be covered with short fibers. The patent CN18092292A (DuPont) discloses a two-sided composite knitted fabric. , the cut-resistant fiber component provided is mainly the known high-strength aromatic polymer and branched polyethylene blend fiber, but the mixed spinning implementation is more complicated and complicated, and it is difficult to achieve uniformity during spinning; patents CN101528998A and 102277669A (DSM) discloses a composite yarn comprising long filaments and so-called fixed-length fibers, wherein the main fixed-length fibers are chopped hard fibers with a certain length-to-diameter ratio, including: glass fiber, ore (stone) fiber or metal fiber, the chemical properties of the hard fiber are not specified in this patent technology, only that it is spun by known rotary technology or jet spinning, its diameter is less than 25 μm, and its aspect ratio is greater than 10, and then it is Grinding into chopped hard fibers, this method focuses on the improvement of the aspect ratio and diameter of the chopped hard fibers in macroscopic dimension processing, and then mixed with ultra-high molecular weight polyethylene (UHMWPE) solution for spinning, It has a significant effect on improving the cutting resistance of UHMWPE fibers, but the preparation process and cost of fixed-length hard fibers in this method, especially the control of size distribution, is difficult, especially when some longer hard fibers exceed UHMWPE fibers. diameter, it is unfavorable to the stability of the solution spinning process, and has an impact on the strength (including modulus, breaking strength, etc.) The spinning method further forms a sheath-core structure by coating it with polar polyarylene amide and other fiber filaments, wherein the cut-resistant filaments made as before are used as the core. This improvement has a certain effect, but this method It is still limited to the improvement of weaving structure, and glass fiber has a certain impact on human health

At present, the above-mentioned patents usually use the basic mechanical properties of high-strength and high-modulus UHMWPE, aromatic polyamide fibers, etc., which are composited with other hard fibers or organic elastic fibers, and the prepared composite yarns are used for weaving when processing finished products. Made into glove-like woven fabrics, used in cut-resistant fields, the process is complex

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