Preparation method for aramid fiber composite rubber pipeline

Abstract

The invention provides a preparation method of an aramid fiber composite rubber pipeline. The method includes the following steps of 1, modification of aramid fiber, 2, processing of blended rubber, 3, molding and 4, vulcanization. The modification of aramid fiber specifically includes the following steps of A, first bath treatment, B, primary drying, C, secondary bath treatment and D, secondary drying, wherein in the step A, water-soluble high-activity reactive isocyanate is adopted for pre-impregnation, and in the step C, RFL impregnation liquid is used for impregnation. The two-bath impregnation treatment technology with activating first and RFL tackifying second is adopted, and not only has improvement in the fiber surface activation pretreatment technology during primary bath, but also has creative improvement in RFL tackifying treatment formula and process during secondary bath. After repeated experiments, the matching ratio of primary-bath impregnation liquid, secondary-bath RFresin and RFL impregnation liquid and the technological parameters of impregnation treatment are obtained, the specific parameters are determined, and the optimal effect is achieved.

Description

technical field [0001] The invention relates to the technical field of aramid fiber preparation, in particular to a method for preparing an aramid fiber composite rubber pipeline. Background technique [0002] Rubber hose refers to the pipe used for gas transportation, which is often used in gas welding, gas cutting, various gas shielded welding, plasma arc welding and cutting, etc. Rubber tubes are widely used. After more than 50 years of development, my country's rubber tube industry has played an indispensable supporting role in the national economy. The rubber tube industry has continuously penetrated into related fields, opening up the application range and fields of rubber tubes. Products are widely used in ports, petroleum, automobiles, light industry, engineering machinery, agriculture, aviation, aerospace and other fields. [0003] The rubber tube has good sealing performance, firm and flexible structure, and has incomparable advantages compared with metal tubes or ...

AI Technical Summary

Problems solved by technology

However, because aramid fiber has a high degree of orientation and cleanliness, and has no amorphous region, and there are a large number of benzene rings in the molecular chain segment, the steric hindrance is relatively large, so it is difficult for the amide group to interact with other atoms or groups. Chemical reaction occurs, so it is difficult to bond and impregnate the surface of aramid fibers, and the dispersion of fibers is another technical problem in the industry. Excessive mixing for uniform fiber dispersion will lead to excessive reduction in fiber length and rubber The molecular weight decreases, which deteriorates the performance; if the fiber length is long but the dispersion is uneven, the composite rubber hose material with excellent performance cannot be obtained.

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