Method for preparing spinning solution of ultra-high molecular weight polyethylene fiber

摘要

Provided is a method for preparing a spinning solution of ultra-high molecular weight polyethylene fiber, which comprises mixing a dissolved solution of ultra-high molecular weight polyethylene with a swollen solution of ultra-high molecular weight polyethylene at a weight ratio of 0.42˜2.85, to obtain a spinning solution with a content of the ultra-high molecular weight polyethylene being 10%˜15% by weight; the content of the ultra-high molecular weight polyethylene in the swollen solution of ultra-high molecular weight polyethylene is 10%˜50% by weight; and the weight ratio of the ultra-high molecular weight polyethylene in the swollen solution of ultra-high molecular weight polyethylene to the ultra-high molecular weight polyethylene in the dissolved solution of ultra-high molecular weight polyethylene is 2.5˜70. Since the dissolved solution functions to plasticize the swollen solution, the problem of high viscosity of the spinning solution is well addressed, thus ensuring that the spinning solution has a good fluidity and spinning continuity, and avoiding broken filament and filament breakage from occurring in the subsequent spinning process, so as to prepare ultra-high molecular weight polyethylene fiber with good performance.

主权项

1. A method for preparing a spinning solution of ultra-high molecular weight polyethylene fiber, comprising:
mixing a dissolved solution of ultra-high molecular weight polyethylene with a swollen solution of ultra-high molecular weight polyethylene at a weight ratio of 0.42 to 2.85, to obtain a spinning solution in which the content of the ultra-high molecular weight polyethylene is 10% to 15% by weight; wherein the swollen solution of ultra-high molecular weight polyethylene has a degree of swelling of 1 to 2; wherein the content of the ultra-high molecular weight polyethylene in the swollen solution of ultra-high molecular weight polyethylene is 10 to 50% by weight; and wherein the weight ratio of the ultra-high molecular weight polyethylene in the swollen solution of ultra-high molecular weight polyethylene to the ultra-high molecular weight polyethylene in the dissolved solution of ultra-high molecular weight polyethylene is 2.5 to 70; wherein the swollen solution of ultra-high molecular weight polyethylene is prepared by: adding a powder of ultra-high molecular weight polyethylene to a first portion of a solvent under stirring; adding a second portion of the solvent and a first emulsified solvent to the first portion of the solvent to obtain a first mixture; and heating the first mixture to 90° C. to 130° C. and holding at a temperature for swelling to obtain the swollen solution of ultra-high molecular weight polyethylene; wherein the first emulsified solvent is formed from a third portion of the solvent, an antioxidant and a surfactant through emulsification; and wherein the weight ratio of the first portion of the solvent:the second portion of the solvent:the third portion of the solvent:the antioxidant:the surfactant is 45 to 55:45 to 55:1 to 20:0.5 to 5:0.05 to 0.1; and wherein the dissolved solution of ultra-high molecular weight polyethylene is prepared by: adding a second emulsified solvent, a fourth emulsified solvent and a fifth portion of solvent to a fourth portion of the solvent under well stirring to obtain a second mixture, and then heating the second mixture to 100° C. to 190° C. under stirring to obtain the dissolved solution of ultra-high molecular weight polyethylene; wherein the second emulsified solvent is formed from a sixth portion of the solvent and the ultra-high molecular weight polyethylene in a proportion of 1 to 5:0.4 to 0.6 through emulsification; wherein the fourth emulsified solvent is formed from a seventh portion of the solvent and an antioxidant through emulsification; and wherein the weight ratio of the fourth portion of the solvent:the fifth portion of the solvent:the sixth portion of the solvent:the seventh portion of the solvent is 67 to 75:15 to 25:2 to 10:2 to 4.