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Method for preparing MWNT (Multi-Walled Carbon Nanotube) modified paper-based friction material

A multi-walled carbon nanotube, paper-based friction material technology, applied in chemical instruments and methods, synthetic cellulose/non-cellulose material pulp/paper, paper, etc., can solve the material failure, the performance degradation of multi-layer carbon nanotubes , easy delamination and other problems, to achieve the effect of low wear rate, stable friction performance, and improved friction performance

Active Publication Date: 2014-12-03
杨洁如
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this method is to coat the multilayer carbon nanotubes on the surface of the formed paper base, under the long-term friction and shear force, the performance of the material will decrease significantly after the multilayer carbon nanotubes fall off, and Easy to delaminate and lead to material failure and other problems

Method used

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  • Method for preparing MWNT (Multi-Walled Carbon Nanotube) modified paper-based friction material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Take 0.7g of cashew nut shell modified phenolic resin, dissolve it in 150ml of absolute ethanol to obtain a phenolic resin solution, wait for the phenolic resin to fully dissolve and let it stand for 20 hours, seal it and store it to obtain A solution;

[0019] Step 2: Disperse 0.5g of multi-walled carbon nanotubes with a diameter of 30-50nm in 100ml of 0.1% sodium dodecylsulfonate (SDS) aqueous solution, and magnetically stir for 4 hours to configure uniformly dispersed carbon nanotubes Suspension B;

[0020] Step 3: Take 6g of chopped carbon fibers with a diameter of 8-15 μm, 5g of bamboo fibers with a beating degree of 75°SR, 1g of diatomaceous earth, and water that can completely disperse the above raw materials, disperse them in water to obtain a mixed solution, and then Get 80g of suspoemulsion B and pour into the mixed solution to obtain C solution;

[0021] Step 4: Pour the C solution into the decomposer and disperse it for 800r, take out the decomposed...

Embodiment 2

[0024] Step 1: Take 1.2g of cashew nut shell modified phenolic resin, dissolve it in 150ml of absolute ethanol to obtain a phenolic resin solution, wait until the phenolic resin is fully dissolved, let it stand for 24 hours, seal it and save it, and obtain A solution;

[0025] Step 2: Disperse 1 g of multi-walled carbon nanotubes with a diameter of 30-50 nm in 170 ml of 0.2% sodium dodecylsulfonate (SDS) aqueous solution, and stir magnetically for 5 hours to prepare a uniformly dispersed carbon nanotube suspension Liquid B;

[0026] Step 3: Take 8g of chopped carbon fiber with a diameter of 8-15 μm, 7g of bamboo fiber with a beating degree of 78°SR, 1.5g of diatomaceous earth and water that can completely disperse the above raw materials, disperse it in water to obtain a mixed solution, and then Take 100g of suspoemulsion B and pour it into the mixed solution to obtain C solution;

[0027] Step 4: Pour the C solution into the decomposer and disperse for 1000r, take out the de...

Embodiment 3

[0030] Step 1: Take 2.25g of cashew nut shell modified phenolic resin, dissolve it in 150ml of absolute ethanol to obtain a phenolic resin solution, wait until the phenolic resin is fully dissolved, let it stand for 26 hours, seal it and save it, and obtain A solution;

[0031] Step 2: Disperse 2.5g of multi-walled carbon nanotubes with a diameter of 30-50nm in 250ml of 0.3% sodium dodecylsulfonate (SDS) aqueous solution, and magnetically stir for 5.5 hours to prepare uniformly dispersed carbon nanotubes Suspension B;

[0032] Step 3: Take 10g of chopped carbon fiber with a diameter of 8-15 μm, 9g of bamboo fiber with a beating degree of 80°SR, 2.5g of diatomaceous earth and water that can completely disperse the above raw materials, disperse it in water to obtain a mixed solution, and then Then get 200g suspoemulsion B and pour into the mixed solution to obtain C solution;

[0033] Step 4: Pour the C solution into the deconcentrator and disperse for 1500r, take out the C sol...

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Abstract

The invention relates to a method for preparing an MWNT (Multi-Walled Carbon Nanotube) modified paper-based friction material, which comprises the following steps of: dissolving cashew nut shell modified phenolic resin into absolute ethyl alcohol to obtain solution A; dispersing MWNTs into aqueous solution of sodium dodecyl sulfate to obtain suspension B; dispersing chopped carbon fibers, bamboo fibers and kieselguhr into water and then adding the suspension B to obtain solution C; after pouring the solution C into a fluffer to disperse, carrying out sheet making on a sheet making machine and drying to obtain a sample wafer D; and after impregnating the sample wafer D in the solution A, taking out the sample wafer D, naturally air-drying the sample wafer D and carrying out hot-press forming on a vulcanizing machine so as to obtain the MWNT modified paper-based friction material with a stable friction performance. According to the invention, the carbon nanotubes are used as the raw materials to be added into a carbon fiber reinforced reins-based wet friction material so as to prepare the single-layer paper-based friction material. The problems of delamination and unstable friction performance in the long-term application process, which are caused by the case that the carbon nanotubes are used as an enhancement layer to be added into the friction material in a conventional process, are solved; the friction performance of the paper-based friction material is greatly improved; and the wear rate is effectively reduced.

Description

technical field [0001] The invention relates to a preparation method of a modified paper-based friction material, in particular to a preparation method of a multi-walled carbon nanotube modified paper-based friction material. Background technique [0002] Wet friction materials refer to friction materials that work in lubricating media (mainly lubricating oil), and are mainly used in wet transmission systems such as automatic transmissions, differentials, torque managers and synchronizers [P.Marklund, R.Larsson.Tribology International, 2008, 41:824–830.]. Due to different conditions of use, the speed, pressure and load of the transmission system are very different. It is difficult for a single material to meet the requirements of all working conditions, so a variety of wet friction materials have been developed, mainly including cork rubber-based friction materials and powder metallurgy friction materials. , paper-based friction materials and carbon / carbon composite materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/50D21H17/48D21H17/68D21H17/00C09K3/14
Inventor 黄剑锋王文静费杰曹丽云吴养育王洪坤
Owner 杨洁如
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