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A kind of preparation method of high porosity paper-based friction material

A paper-based friction material, high porosity technology, applied in pulp raw material addition process, synthetic cellulose/non-cellulose material pulp/paper, papermaking, etc., can solve the problem of increased material wear rate, high equipment requirements, synchronization To improve the average pore size and porosity, optimize the preparation process, and achieve the effect of high dynamic friction coefficient

Active Publication Date: 2022-07-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foamed phenolic resin glue impregnated paper-based friction material prepared by this method has the characteristics of excellent tensile strength and high porosity, but the raw material components of this method are relatively complex, and the requirements for equipment are high, and there is no evaluation of this method. The friction and wear properties of the materials
[0006] At present, there are two deficiencies in the existing technology for regulating the pore structure of paper-based friction materials. On the one hand, the method and approach for regulating the pore structure of the material are relatively simple, mainly by changing the thickness of the material or the parameters of hot-press curing; Some technical solutions often increase the wear rate of the material while increasing the friction coefficient by increasing the porosity, which cannot achieve simultaneous improvement of friction and wear performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Weigh 2.1 g of cashew nut shell oil modified phenolic resin powder and dissolve it in alcohol to prepare a phenolic resin solution with a mass fraction of 20%. Measure 11.64ml of nitrile rubber solution with a mass fraction of 20%, pour it into the prepared phenolic solution, stir electromagnetically for 10min under the condition of 1000r / min, then seal and stand for 24h to fully mix the two solutions.

[0028] Step 2: Weigh out a total of 2.7g of reinforcing fibers, which are respectively 1.4g of carbon fiber, 1.3g of aramid fiber; 1.5g of paper fiber; and 3.0g of friction performance modifier, respectively 0.60g of alumina, 0.60g of chromite, and 0.60g of ore Powder 0.45g, zinc oxide 0.45g, barium sulfate 0.39g, talc 0.22g, graphite 0.17g, carbon black 0.12g; organic chemical foaming agent: N,N'-dinitrosopentamethylenetetramine 0.32 g.

[0029] Step 3: Mix the weighed reinforcing fiber, paper fiber, friction performance modifier and organic chemical foaming a...

Embodiment 2

[0037] Step 1: Weigh 2.1 g of cashew nut shell oil modified phenolic resin powder and dissolve it in alcohol to prepare a phenolic resin solution with a mass fraction of 20%. Measure 11.64ml of nitrile rubber solution with a mass fraction of 20%, pour it into the prepared phenolic solution, stir electromagnetically for 10min under the condition of 1000r / min, then seal and stand for 24h to fully mix the two solutions.

[0038] Step 2: Weigh out a total of 2.7g of reinforcing fibers, which are respectively 1.4g of carbon fiber, 1.3g of aramid fiber, 1.5g of paper fiber, and 2.4g of friction performance modifier, which are respectively 0.48g of alumina, 0.48g of chromite, and 0.48g of ore. Powder 0.36g, zinc oxide 0.36g, barium sulfate 0.31g, talc 0.17g, graphite 0.14g, carbon black 0.10g; organic chemical foaming agent: N,N'-dinitrosopentamethylenetetramine 0.65 g.

[0039] Step 3: Mix the weighed reinforcing fiber, paper fiber, friction performance modifier and organic chemica...

Embodiment 3

[0047] Step 1: Weigh 2.1 g of cashew nut shell oil modified phenolic resin powder and dissolve it in alcohol to prepare a phenolic resin solution with a mass fraction of 20%. Measure 11.64ml of nitrile rubber solution with a mass fraction of 20%, pour it into the prepared phenolic solution, stir electromagnetically for 10min under the condition of 1000r / min, then seal and stand for 24h to fully mix the two solutions.

[0048] Step 2: Weigh a total of 2.7g of reinforcing fibers, respectively 1.4g of carbon fiber, 1.3g of aramid fiber, 1.5g of paper fiber, and 1.8g of friction performance modifier, respectively 0.36g of alumina, 0.36g of chromite, and 0.36g of ore. Powder 0.27g, zinc oxide 0.27g, barium sulfate 0.23g, talc 0.12g, graphite 0.11g, carbon black 0.08g; organic chemical foaming agent: N,N'-dinitrosopentamethylenetetramine 0.97 g.

[0049] Step 3: Mix the weighed reinforcing fiber, paper fiber, friction performance modifier and organic chemical foaming agent with 150...

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Abstract

The invention relates to a preparation method of a high-porosity paper-based friction material. The pore structure of the paper-based friction material can be effectively regulated by introducing chemical foaming technology in the preparation process of the traditional paper-based friction material. Significantly increase the average pore size and porosity of the material. The beneficial effects are as follows: it can overcome the defects that the existing control technology for the pore structure of the paper-based friction material is relatively simple, and the friction and wear properties cannot be improved at the same time. Paper-based friction materials with different pore structures can be obtained by changing the added amounts of organic chemical foaming agents and foaming aids, and the pore structure of paper-based friction materials can be controlled. The nucleation and growth of bubbles in the process of hot-pressing foaming will generate extrusion force on the matrix to provide a driving force for the curing of the matrix, improve the curing degree of the resin and the vulcanization degree of the rubber, thereby increasing the strength of the material and reducing the wear rate.

Description

technical field [0001] The invention belongs to the technical field of friction materials, and relates to a preparation method of a high-porosity paper-based friction material. Background technique [0002] Paper-based friction material is a porous material that works in lubricating oil, and is widely used in clutch / brake devices of automobiles and construction machinery. It is generally composed of reinforcing fibers, friction performance modifiers and resin binders, which are cured by papermaking and hot pressing. In order to effectively transmit torque and obtain longer service life, such materials are generally required to have a high coefficient of friction and a low wear rate [0003] Pore ​​structure affects the friction, wear, compressive shear strength and applicable temperature of paper-based friction materials to a great extent. First, higher porosity and average pore diameter can improve the surface roughness of the material, increase the degree of meshing betw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/20D21H13/26D21H13/40D21H13/46D21H17/67D21H21/14D21H23/32
CPCD21H13/40D21H13/46D21H13/26D21H13/20D21H17/67D21H21/14D21H23/32
Inventor 费杰李畅傅业伟李贺军齐乐华
Owner NORTHWESTERN POLYTECHNICAL UNIV
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