Cross-linked modified ultra-high molecular weight polyethylene fiber and its preparation method

Abstract

The invention relates to a crosslinked and modified ultrahigh molecular weight polyethylene fiber and a preparation method thereof. The preparation method comprises the following steps: performing multi-stage hot stretching on an ultrahigh molecular weight polyethylene fiber precursor and inducing the ultrahigh molecular weight polyethylene fiber precursor to be crosslinked when in last-stage hotstretching, so as to obtain the crosslinked and modified ultrahigh molecular weight polyethylene fiber. According to the prepared crosslinked and modified ultrahigh molecular weight polyethylene fiber, under the conditions that the temperature is 70 DEG C, the load is 300MPa, and the loading time in the primary stage is 10 days, the creep elongation is 5.04%-5.85%; under the condition that the loading time in the balance stage is 130 days, the creep elongation is 0.56%-0.62%; under the conditions that the load is 15MPa, and the heating rate is 2 DEG C / min, the breakage temperature is 196-206 DEG C. the method is simple in process; the prepared fiber is good in mechanical property, creep resistance and heat resistance, therefore, the fiber has excellent promotional value.

Description

technical field [0001] The invention belongs to the field of fiber modification, and relates to a modified ultra-high molecular weight polyethylene fiber, in particular to a cross-linked modified ultra-high molecular weight polyethylene fiber and a preparation method thereof. Background technique [0002] Due to its excellent mechanical properties, chemical resistance, impact resistance, bending resistance, low temperature resistance and weather resistance, ultra-high molecular weight polyethylene (UHMWPE) fibers and their fiber composites are used in aerospace, personal protection, marine engineering, New energy and sports equipment and other fields have received extensive attention. However, due to the large molecular weight of UHMWPE and the high degree of chain entanglement of its molecular structure, its viscosity is relatively large and processing is difficult. In the current industrialized gel spinning or dry spinning method, the concentration of the spinning solution...

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Problems solved by technology

However, this method involves the field of raw material synthesis, and the process is relatively complicated, and the simple transformation of the existing spinning technology cannot meet its requirements.

In addition, researchers have also studied to improve the creep resistance and heat resistance of UHWMPE by adding materials such as carbon nanotubes, graphene and nano-silicon dioxide, but the above methods will increase the viscosity of the spinning solution, which is not conducive to spinning normal progress

[0004] To sum up, when preparing UHWMPE fibers in the prior art, it is impossible to improve the creep resistance and heat resistance of the spinning solution without increasing the viscosity of the spinning solution, and there will be organic solvents that are difficult to handle or the coupling that enters the fiber. Difficult to control the amount of dose