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Method for preparing friction-resistant composite material by modifying solvent type lignin

A composite material and lignin technology, which is applied in the field of solvent-based lignin modification to prepare friction-resistant composite materials, can solve problems such as high cost, high resource consumption, and environmental pollution, and achieve low manufacturing cost, high purity, and excellent performance. Effect

Active Publication Date: 2010-11-24
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide solvent-based lignin modification to prepare friction-resistant composite materials for the problems of high resource consumption, high cost, and environmental pollution in the process of preparing modified phenolic resins from phenols. The method of materials, so as to realize the requirements of reducing costs and protecting the environment in the preparation of friction-resistant composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 15g of enzymatic lignin extracted from corncobs and 60g of phenol into a three-necked flask with a heating and stirring device at 60-65°C, stir for 25min, dissolve evenly, add 5g of 1,4 butanediol, 10g of cashew nut shell oil As a resin modification additive, add 22ml of formaldehyde dropwise within 30min. When the temperature rises to 90°C, add 2g of oxalic acid catalyst to it, and start timing. Discharge at 160° C. to obtain 91 g of solvent-based lignin-modified phenolic resin.

[0053] Mix 28g of solvent-based lignin-modified phenolic resin, 32g of steel fiber, 33g of copper particle filler, and 6g of hexamethylenetetramine curing agent through a high-speed rotary mixer for 10 minutes to achieve the purpose of uniform mixing. Medium-pressed samples, according to GB5763-2008 standard, test sample size 25.0 ×25.0 ×5.0~7.0±0.1 mm, pressing temperature 150°C±5°C, forming pressure 20-25Mpa, holding time 5-10min, post-treatment 160-180°C for 15h. The test results ...

Embodiment 2

[0055] Add 20g of high-boiling alcohol lignin extracted from pine and 55g of phenol into a three-necked flask with a heating and stirring device at 60-70°C, stir for 30min, and after dissolving evenly, add 6g of tung oil as a resin additive in sequence, and then add 6g of tung oil as a resin additive in 30min Add 25ml of formaldehyde dropwise, when the temperature rises to 90°C, add 1.5g of phosphoric acid catalyst to it, and start timing, the reaction ends after 1.5h, and then starts dehydration under reduced pressure to remove small molecular substances, and discharges at 160-165°C , to obtain 90g of solvent-based lignin-modified phenolic resin.

[0056] 25g solvent-based lignin modified phenolic resin, 35g steel fiber, 15g alumina powder, 13g graphite, 10g copper particles, 2g zinc stearate, 5g hexamethylenetetramine curing agent, stirred by a high-speed rotary mixer for 5 -15min, in order to achieve the purpose of uniform mixing, and then press the sample in the hydraulic ...

Embodiment 3

[0058] Add 20g of enzymatic lignin and 65g of phenol into a three-necked flask with a heating and stirring device at 70°C, stir for 25min, and after dissolving evenly, add 4g of 1,4 butanediol and 3g of tung oil as resin modification additives. Then add 18ml of acetaldehyde dropwise within 30 minutes. When the temperature rises to 90°C, add 2.g of oxalic acid catalyst to it, and start timing. After 3.0 hours of reaction, start dehydration under reduced pressure to remove small molecular substances. The material was discharged to obtain 92g of solvent-based lignin-modified phenolic resin.

[0059] Mix 28g of solvent-based lignin-modified phenolic resin, 32g of steel fiber, 10g of alumina powder, 15g of graphite, 10g of copper particle filler, and 5g of melamine curing agent through a high-speed rotary mixer for 5-15 minutes to achieve uniform mixing , and then press the sample in the hydraulic press, according to the GB5763-2008 standard, the test sample size is 25.0 ×25.0 ...

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Abstract

The invention provides a new method for preparing a friction-resistant material by taking lignin as a modifying raw material. The new method is used for preparing the friction-resistant material by taking the solvent type lignin as the modifying raw material. The method can utilize the renewable lignin and has the advantages of strong chemical activity, high purity and the like, the solvent type lignin is taken for replacing phenols for preparing lignin-modified phenolic resin, and the resin has more polar groups in comparison with the traditional phenolic resin and stronger affinity in comparison with other components for preparing the friction-resistant material, thereby not only improving the performances of the friction-resistant material, but also fully utilizing the renewable resource and reducing the consumption of petroleum chemicals; simultaneously, the method can reduce the cost of preparing the friction-resistant material, save energy, reduce emission and produce great social benefits; furthermore, the process for preparing the friction-resistant material is simple and easy to implement and can produce good effects.

Description

technical field [0001] The invention belongs to the field of new material development and preparation, and more specifically relates to a method for preparing a friction-resistant composite material by solvent-type lignin modification. Background technique [0002] As fossil resources such as petroleum and coal in the world are decreasing day by day, it is imperative to vigorously develop new green materials. Because phenolic resin has good acid resistance, mechanical properties, and heat resistance, the matrix of brake composite materials used in automobiles, motorcycles and other vehicles is mainly phenolic resin (PF). However, at high temperatures, the phenolic hydroxyl groups in PF are very It is easy to be oxidized, which will lead to the decomposition or destruction of friction materials. The limit heat resistance temperature of pure PF is 250°C, so ordinary PF can only be used normally under 250°C. When it exceeds 300°C, thermal decomposition will be very serious. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/14C08K13/04C08K7/04C08K3/22C08K3/04C08K3/30C08K3/08C08K5/3477C08K5/3492C09K3/14B29C43/58
Inventor 程贤甦
Owner FUZHOU UNIV
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