Method of improving surface cohesion performance of relative molecular weight polyethylene

Abstract

The invention discloses a method for improving surface bonding performance of ultrahigh molecular polyethylene filter (UHMWPE), including the steps as follows: (1) dissolving polar polymer in a routine extractant of ultrahigh weight-average relative molecular weight polyethylene jelly glue filter with a relative molecular weight of 1,000,000-5,000,000 to make a composite extractant, where the polar polymer accounts for 0.1wt%-10wt% (weight percent); (2) extracting the said jelly glue fiber at 0.4-5 atmospheres at 0-80 deg.C in the composite extractant for 0.1-20 min, and then by the postprocessing procedures, such as stretching, making an ultrahigh relative molecular weight polyethylene fiber with the surface bonding performance has been improved to a higher extent. The advantages of the invention are that it maximumly holds original fiber strength and the surface bonding performance of UHMWPE has a relatively outstanding improved effect.

Description

technical field [0001] The invention relates to a method for modifying ultra-high relative molecular weight polyethylene (UHMWPE) fibers, in particular to a method for improving the surface bonding performance of ultra-high relative molecular weight polyethylene fibers. Background technique [0002] UHMWPE fiber is the third-generation high-performance fiber after carbon fiber and aramid fiber, and has mechanical properties unmatched by other high-performance fibers. Its specific strength and specific modulus are the highest among all chemical fibers. In addition, it also has excellent chemical resistance, weather resistance, high energy absorption, impact resistance, low temperature resistance, electrical insulation, and x-ray transparency. And certain water resistance and other excellent properties, so it is widely used in military, aerospace and navigation engineering, leisure sporting goods and high-performance, lightweight composite materials and other fields, such as p...

AI Technical Summary

Problems solved by technology

[0005] CN1035308A discloses a method for improving the surface bonding performance of UHMWPE fibers. It is to carry out plasma treatment on the surface of UHMWPE fibers. This method can effectively improve the wettability and surface bonding strength of fibers to the resin matrix, but this method is difficult to achieve Continuous production, industrialization is more difficult, and improper treatment will significantly reduce the mechanical properties of fibers

However, the process of this method is cumbersome, and the best process conditions are difficult to grasp, and the prospects for industrialization are slim.

[0009] In addition to the above-mentioned post-processing methods, Jia Guangxia and others also explored the method of blending modification in "Research on the Adhesiveness of Ultra-high Molecular Weight Polyethylene Fibers" (Synthetic Fiber Industry, 1995, (6): 24-28) , that is, a certain proportion of ethylene-vinyl acetate copolymer (EVA) is blended into the spinning dope, and then the UHMWPE fiber with improved surface bonding properties can be obtained through spinning and stretching, but this method makes the fiber less The decrease in strength is more obvious