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Method for modifying carbon fibers for paper-based friction material

A paper-based friction material and carbon fiber technology, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., to achieve high surface activity, good dispersibility, and the effect of improving material strength

Active Publication Date: 2021-11-19
杭州萧山红旗摩擦材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Suitable for modifying carbon fiber in the process of large-scale production of paper-based friction materials

Method used

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  • Method for modifying carbon fibers for paper-based friction material

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Embodiment 1

[0025] Embodiment 1: A method for modifying carbon fibers for paper-based friction materials, comprising the following steps:

[0026] (1) Preparation of carbon fiber pretreatment system

[0027] Sodium dodecylbenzenesulfonate is dispersed at a concentration of 0.01 wt% to obtain a carbon fiber pretreatment liquid.

[0028] (2) Pretreatment process of carbon fiber

[0029] The carbon fiber pretreatment concentration is 2wt%, the stirring speed is 60 rpm, and the pretreatment time is 30 minutes.

[0030] (3) Preparation of carbon fiber layer assembly deposition modification system

[0031] Cationic polyacrylamide and cationic starch are selected, and anionic polymers include anionic polyacrylamide.

[0032] (4) Carbon fiber layer assembly deposition modification process

[0033] The concentration of the cationic deposition modifier system is 0.2 wt%, the stirring speed is 30 rpm, and the deposition modification time is 10 min. The concentration of the anion deposition modi...

Embodiment 2

[0036] Embodiment 2: A method for modifying carbon fibers for paper-based friction materials, comprising the following steps:

[0037] (1) Preparation of carbon fiber pretreatment system

[0038] The stearic acid is dispersed according to the concentration of 0.02wt% to obtain the carbon fiber pretreatment liquid.

[0039] (2) Pretreatment process of carbon fiber

[0040] The carbon fiber pretreatment concentration is 3wt%, the stirring speed is 70 rpm, and the pretreatment time is 40min.

[0041] (3) Preparation of carbon fiber layer assembly deposition modification system

[0042] Cationic starch is selected as the cationic modified polymer; anionic water-based polyurethane is selected as the anionic modifier.

[0043] (4) Carbon fiber layer assembly deposition modification process

[0044] The concentration of the cationic deposition modifier system is 0.3 wt%, the stirring speed is 40 rpm, and the deposition modification time is 12 min. The concentration of the anion ...

Embodiment 3

[0047] Embodiment 3: A method for modifying carbon fibers for paper-based friction materials, comprising the following steps:

[0048] (1) Preparation of carbon fiber pretreatment system

[0049] The stearic acid is dispersed according to the concentration of 0.03wt% to obtain the carbon fiber pretreatment liquid.

[0050] (2) Pretreatment process of carbon fiber

[0051] The carbon fiber pretreatment concentration is 4wt%, the stirring speed is 80 rpm, and the pretreatment time is 50min.

[0052] (3) Preparation of carbon fiber layer assembly deposition modification system

[0053] Cationic guar gum is selected as the cationic modified polymer; styrene-acrylic emulsion is selected as the anionic modifier.

[0054] (4) Carbon fiber layer assembly deposition modification process

[0055] The concentration of the cationic deposition modifier system is 0.4 wt%, the stirring speed is 50 rpm, and the deposition modification time is 13 min. The concentration of the anion depositi...

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Abstract

The invention relates to a method for modifying carbon fibers for a paper-based friction material, and belongs to the technical field of preparation of paper-based friction materials. The method comprises the following operation steps of 1, adopting a carbon fiber pretreatment system; 2, implementing a carbon fiber pretreatment process; and 3, adopting a layer assembly deposition modification system of the carbon fibers, wherein the suspension liquid of the carbon fibers is used as a matrix for layer deposition modification, a multi-layer alternate deposition mode is adopted for layer deposition adsorption modification, and a modifier is divided into polymers with different anion and cation strengths; and 4, carrying out a layer assembly deposition modification process on the carbon fibers, and repeating the steps, modifying for 3-4 times, filtering and drying to obtain the modified carbon fiber. The obtained carbon fiber can be added as a component for the paper-based friction material. The method has the advantages of simple process and low energy consumption. The technical problems of dispersion, combination and the like of reinforced fibers in the preparation process of the paper-based friction material are solved. The method is suitable for modifying the carbon fibers in the large-scale production process of the paper-based friction material.

Description

technical field [0001] The invention relates to the technical field of preparation of paper-based friction materials, in particular to a method for modifying carbon fibers used in paper-based friction materials. Background technique [0002] Paper-based friction material is a kind of porous wet friction material, which is widely used in wet clutches and brakes of vehicles and construction machinery because of its good friction characteristics. Paper-based friction materials are mainly composed of plant fibers (cotton fibers), reinforcing materials (carbon fibers, aramid fibers), crystal oxide minerals, anti-friction materials (graphite), binders, friction performance modifiers, etc. way of production. [0003] As the modern vehicle industry has higher and higher requirements on the performance of paper-based friction materials, high-performance fibers such as carbon fibers are used more and more in them. However, due to the preparation process of carbon fiber, its surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/256D06M15/285D06M15/11D06M13/188D06M15/564D06M15/03D06M15/233D06M101/40
CPCD06M13/256D06M15/285D06M15/11D06M13/188D06M15/564D06M15/03D06M15/233D06M2101/40
Inventor 程合丽张银华秦亮李国平计德林
Owner 杭州萧山红旗摩擦材料有限公司
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