Production method of ultrahigh molecular weight polyethylene fiber

Abstract

The invention discloses a production method of an excellent solvent of ultrahigh molecular weight polyethylene and a fiber thereof. The production method is characterized in that the ultrahigh molecular weight polyethylene can be dissolved in the solvent at a temperature being lower than a decomposition temperature of the ultrahigh molecular weight polyethylene to form a homogeneous solution, thereby reducing a macromolecule degradation degree in a dissolving and untwisting process of the ultrahigh molecular weight polyethylene and meanwhile increasing homogeneity of a formed jelly solution to ensure homogeneity and spinnability of primary precursor fibers during a production process of an ultrahigh molecular weight polyethylene fiber. Compared with other spinning solvents and spinning methods, the production method and the solvent in the invention can enable a solvent mass content in the primary precursor fibers to be not more than 2%, breaking strength of the ultrahigh molecular weight polyethylene fiber to be increased by 7-11% and a breaking modulus to be increased by 17-42%.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to an excellent solvent for ultra-high molecular weight polyethylene and a production method for fibers thereof. Background technique [0002] Ultra-high molecular weight polyethylene fiber is a synthetic fiber with high strength and high modulus produced by ultra-high molecular weight polyethylene with a molecular weight of more than 1 million. At present, ultra-high molecular weight polyethylene, carbon fiber and aramid fiber are collectively referred to as three high-performance fiber materials in the world. Among them, ultra-high molecular weight polyethylene fiber has high strength, high modulus, light weight, light resistance, and high wear resistance. It plays an extremely important role in national defense, military industry, and aerospace, and it has also been more and more widely used in civilian fields. [0003] In 1979, the Netherlands DSM company first applied ...

AI Technical Summary

Problems solved by technology

Because the dissolution and unwrapping process is carried out under high temperature and high shear conditions, its macromolecular chains are prone to breakage during the dissolution process, resulting in the degradation of ultra-high molecular weight polyethylene molecules, resulting in the performance of ultra-high molecular weight polyethylene fibers. In addition, the dissolution process of UHMWPE in a solvent is extremely slow: UHMWPE macromolecular chains are very long and difficult to move, the force between macromolecules is large, and there are many entanglement points between molecules, and the large After the molecule is in contact with the small molecule of the solvent, only one of the structural units is solvated, but it is still a part of the macromolecular chain, restraining the movement of the entire macromolecule, only when all the units of the entire macromolecule are solvated After that, it is possible to fall off the surface of the solid phase as a whole and enter the solvent to form a uniform solution.

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