Surface modification method of aramid fibers

A technology of aramid fiber and surface modification, which is applied in fiber type, fiber treatment, textile and papermaking, etc., and can solve problems such as performance degradation, rubber molecular weight decrease, and excessive fiber length reduction.

Inactive Publication Date: 2019-07-02
青岛中维新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersion of fibers is another technical problem in the industry. Excessive kneading in order to make the fibers dispersed uniformly will lead to excessive reduction in fiber length, decrease in rubber molecular weight, and deterioration of performance; if the fiber length is long but the dispersion is uneven Composite materials with less than excellent performance

Method used

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  • Surface modification method of aramid fibers
  • Surface modification method of aramid fibers
  • Surface modification method of aramid fibers

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0026] Cut the aramid filament (brand: AF-1000, 1500 denier, Korea ALKEX company) into 20mm sections, clean the aramid fiber with acetone ultrasonically for 1 hour, and then dry it to remove the organic coating attached to its surface;

[0027] S1: Unwind the aramid raw yarn smoothly with a pay-off rack, keeping it from loosening and twisting;

[0028] S2: Reach the first group of drafting rollers through the splitting comb, and enter the first glue tank through the guide roller for a bath; the first bath uses phenol-blocked polyisocyanate, which specifically includes step 1: impregnating with isocyanate at a temperature of 50-15 °C Wash and dry the aramid fiber for 1-3 hours; step 2: impregnate the aramid fiber with an acetone solution of epoxy resin with a mass percentage concentration of 6-18% at room temperature for 2.5-4 hours, and complete after drying Surface modification of aramid fibers.

[0029] S3: enter the first layer of oven for drying, the drying temperature is...

experiment example 2

[0035] Under the same experimental conditions, steps S1-S8 of comparative experimental example 1 were not subjected to any treatment.

[0036] Comparative Experiment:

[0037] Take by weighing 40 grams of aramid staple fibers obtained in Experimental Examples 1, 2, and 3 respectively, and mix with 1000 grams of natural rubber, 17 grams of sulfur vulcanizing agent and 10 grams of compounding agent; compounding agent includes 30 grams of zinc oxide, 20 grams of stearin Acid, 17.1 grams of accelerator M, 14.7 grams of accelerator DM, 5 grams of accelerator D, 3.2 grams of accelerator TMTD and 10 grams of anti-aging agent SP-C.

[0038] Mix them in an internal mixer at 120°C for 10 minutes at a speed of 80r / min, then mix them on a double-roll mill at 60°C, add 17g of sulfur vulcanizing agent and 100g of compounding agent, and pass it 4 times. The mixed rubber is obtained; the mixed rubber is vulcanized at 145° C. according to the positive curing time tc90 measured by a vulcanizer...

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Abstract

The invention provides a surface modification method of aramid fibers. The method comprises the following steps: S1: impregnating the aramid fibers with isocyanate at the temperature of 50-15 DEG C for 1-3h, washing and drying; S2: using an acetone solution, having a mass percentage concentration of 6-18%, of epoxy resin to impregnate the aramid fibers at the room temperature for 2.5-4h, and drying to complete the surface modification of the aramid fibers. The fiber surface activation pretreatment technology is improved on the basis of polyester fiber surface pretreatment production and development for years, and RFL thickening treatment formula and process of a second bath are innovated and modified, so that the bonding reinforcement requirements of different substrates are met. The ratioof a first bath to impregnation liquid as well as the process parameters of impregnation treatment are repeatedly tested, and the specific parameters are determined, so that a best effect is achieved.

Description

technical field [0001] The invention relates to the technical field of modification of aramid fibers, in particular to a method for modifying the surface of aramid fibers. Background technique [0002] Aramid fiber is one of the ideal skeleton materials. Because it 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 the amide group is difficult. It reacts chemically with other atoms or groups, so it is difficult to bond and impregnate the surface of aramid fiber. Based on this, experts and scholars at home and abroad have conducted a lot of research and experiments on the surface adhesion modification of aramid fiber. At present, the surface treatment of aramid fiber of aramid fiber / rubber composite materials that has entered industrial applications often uses latex, plasma, and phosphoric acid to corrode the fiber surface. Fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/395D06M15/55D06M101/36
CPCD06M13/395D06M15/55D06M2101/36
Inventor 马常杰
Owner 青岛中维新材料有限公司
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