Preparation method of polydopamine modified carbon fiber/mullite whisker reinforced resin-based friction material

A technology of mullite whisker and reinforced resin base, applied in the field of dry friction materials, can solve the problems of fiber surface damage, reduce the bonding strength of ceramic/fiber and resin interface, etc. The effect of thermal performance improvement

Inactive Publication Date: 2019-12-06
SHAANXI UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, the defect of this method is that the high temperature heat treatment of carbon fiber will cause damage to the fiber surface, and secondly, the surface of ceramic porcelain particles is not easy to graft silane coupling agent, which reduces the interface bonding strength of ceramic / fiber and resin

Method used

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  • Preparation method of polydopamine modified carbon fiber/mullite whisker reinforced resin-based friction material
  • Preparation method of polydopamine modified carbon fiber/mullite whisker reinforced resin-based friction material
  • Preparation method of polydopamine modified carbon fiber/mullite whisker reinforced resin-based friction material

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preparation example Construction

[0027] A method for preparing a polydopamine-modified carbon fiber / mullite whisker-reinforced resin-based friction material, comprising the following steps:

[0028] 1) The carbon fiber and mullite whiskers are degummed and cleaned respectively by using a mixed solution of acetone and ethanol, and the volume ratio of acetone and ethanol in the mixed solution of acetone and ethanol is 1:1;

[0029] 2) Dissolving Tris in ultrapure water and adjusting the pH of the solution to 8.5 to obtain a buffer solution with a concentration of 10-40 mM, adding dopamine to the buffer solution and stirring to obtain a concentration of 1-2.5 g / L Dopamine modification solution, the carbon fibers and mullite whiskers obtained in step 1) are added to the dopamine modification solution respectively for modification, the modification time is 24h, the temperature is room temperature, stir with a magnetic stirrer, and the stirring speed is 600r / min, the modified carbon fiber and the modified mullite ...

Embodiment 1

[0033] A method for preparing a polydopamine-modified carbon fiber / mullite whisker reinforced resin-based friction material, comprising the following steps:

[0034] 1) adopting acetone: a mixed solution with a volume ratio of ethanol of 1:1 to degumming carbon fiber and mullite whisker respectively and drying after cleaning with ultrapure water;

[0035] 2) Tris was dissolved in ultrapure water to prepare a 10 mM buffer solution, and the pH of the solution was adjusted to 8.5. Dopamine is added to the buffer solution and stirred to obtain a 1g / L dopamine modified solution, the carbon fibers and mullite whiskers obtained in step 1) are added to the dopamine modified solution respectively, and a magnetic stirrer is used at room temperature to Stir at a speed of 600r / min, wash and filter the modified carbon fibers and mullite whiskers, and dry at 60°C to obtain modified carbon fibers and modified mullite whiskers;

[0036] 3) Mix the modified carbon fiber and the modified mulli...

Embodiment 2

[0038] A method for preparing a polydopamine-modified carbon fiber / mullite whisker reinforced resin-based friction material, comprising the following steps:

[0039] 1) adopting acetone: a mixed solution with a volume ratio of ethanol of 1:1 to degumming carbon fiber and mullite whisker respectively and drying after cleaning with ultrapure water;

[0040] 2) Dissolving Tris in ultrapure water to prepare a 20 mM buffer solution, and adjusting the pH of the solution to 8.5. Dopamine is added to the buffer solution and stirred to obtain a 1g / L dopamine modified solution, the carbon fibers and mullite whiskers obtained in step 1) are added to the dopamine modified solution respectively, and a magnetic stirrer is used at room temperature to Stir at a speed of 600r / min, wash and filter the modified carbon fibers and mullite whiskers, and dry at 60°C to obtain modified carbon fibers and modified mullite whiskers;

[0041] 3) Mix the modified carbon fiber and the modified mullite whi...

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Abstract

The invention discloses a preparation method of a polydopamine modified carbon fiber/mullite whisker reinforced resin-based friction material. The carbon fibers and the mullite whiskers are subjectedto degumming treatment by acetone/ethanol solution separately, and then are added into a prepared dopamine solution, wherein nano-scale polydopamine particles are deposited on the surface through self-oxidation polymerization of dopamine; and the modified mullite whiskers and carbon fibers and modified phenolic resin are mixed, and then are subjected to hot pressing to prepare the resin-based friction material. The friction coefficient of the prepared resin-based friction material is obviously improved, the wear amount is reduced by 53%, the bending strength is improved by 81.2%, and the heatresistance can be improved by 25%. According to the data, the polydopamine surface deposition modification method can effectively enhance the interface bonding strength of resin and the carbon fiber/mullite whisker, so that the resin coating the surface of carbon fiber/mullite whisker does not fall off easily, the friction abrasion performance, the mechanical property and the heat resistance of the friction material are further improved.

Description

technical field [0001] The invention belongs to dry friction materials, in particular to a preparation method of a polydopamine modified carbon fiber / mullite whisker reinforced resin-based friction material. Background technique [0002] Resin-based friction plates, as non-metallic friction plates, have been widely used due to a series of advantages such as wear resistance, no noise, simple preparation process, low production cost, and strong designability of performance. However, the resin-based friction material with single-phase reinforcement has disadvantages such as poor stability of friction coefficient and high-temperature thermal recession during the braking process. At the same time, the weak interface bonding strength between the resin and the reinforcement also directly affects the performance of the friction material. performance, which limits its application in harsh working conditions such as heavy loads and high speeds. [0003] The Chinese patent "A Low Resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/06C08L61/06C08K9/08C08K7/06C08K7/10
CPCC08J5/06C08J2361/06
Inventor 费杰屈蒙张立洁谷岳峰李盟郑欣慧王娜
Owner SHAANXI UNIV OF SCI & TECH
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