CN112064401B - Preparation method of high-porosity paper-based friction material - Google Patents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
- D21H13/40—Inorganic fibres or flakes siliceous vitreous, e.g. mineral wool, glass fibres
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/46—Non-siliceous fibres, e.g. from metal oxides
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
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Abstract
The invention relates to a preparation method of a high-porosity paper-based friction material, which is characterized in that a chemical foaming technology is introduced in the traditional preparation process of the paper-based friction material to effectively regulate and control the pore structure of the paper-based friction material, and the average pore diameter and porosity of the material can be obviously improved after the hot-press molding process is finished. The beneficial effects are that: the defect that the existing regulation and control technology for the pore structure of the paper-based friction material is single and the friction and wear performance cannot be improved simultaneously can be overcome. The paper-based friction material with different pore structures can be obtained by changing the adding amounts of the organic chemical foaming agent and the foaming auxiliary agent, and the regulation and control of the pore structure of the paper-based friction material are realized. The nucleation and growth of bubbles in the hot-pressing foaming process can generate extrusion force on the matrix, thereby providing driving force for the solidification of the matrix, improving the solidification degree of resin and the vulcanization degree of rubber, further increasing the strength of materials and reducing the wear rate.
Description
Technical Field
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
The paper-based friction material is a porous material working in lubricating oil and is widely applied to clutch/brake devices of automobiles and engineering machinery. The friction material is generally composed of reinforced fibers, a friction performance regulator and a resin binder and is prepared by papermaking, hot pressing and curing. In order to be able to transmit torque efficiently and to obtain a longer service life, it is generally required that such materials have a higher coefficient of friction and a lower wear rate
The pore structure greatly influences the performances of the paper-based friction material such as friction, abrasion, compression and shear strength, applicable temperature and the like. Firstly, the higher porosity and average pore size can improve the surface roughness of the material, increase the degree of engagement between the friction material and the friction pair, and increase the friction torque, thereby significantly improving the friction coefficient of the material. In addition, the mobility of the lubricating oil on the surface and inside of the material can be improved due to the increase of the porosity and the average pore diameter, and on one hand, the lubricating oil film is easy to thin in the process of torque transmission/braking, so that the meshing degree of the microprotrusions on the surface of the material and a friction pair is increased, and the dynamic friction coefficient is improved; on the other hand, a large amount of friction heat can be carried away, and the reduction of the material strength is prevented, so that the fixation degree of the material to the surface roughness peak is improved.
Document 1 "influence of porosity on frictional wear performance of carbon fiber reinforced paper-based friction material [ J ] inorganic material science, 2007,22(6): 1159-. The results show that the samples with greater thickness have higher porosity. However, this method increases the porosity and also decreases the strength of the material, resulting in an increased wear rate.
Document 2, "chinese patent with patent publication No. CN 108978346A" discloses a method for preparing a foamed phenolic resin glue solution impregnated paper-based friction material. Mixing low-molecular-weight phenolic resin, polyimide resin, water, absolute ethyl alcohol, an emulsifier, a thickening agent, polyacrylamide, chromium salt and an auxiliary agent, stirring at a constant temperature for reaction, and continuously introducing carbon dioxide gas in the reaction process to prepare foamed phenolic resin glue solution; cutting the hand-made sheet of the paper-based friction material body paper, immersing the hand-made sheet in the foamed phenolic resin glue solution, and preserving heat for impregnation to obtain an impregnated hand-made sheet; and then hot-pressing and molding the impregnated handsheet, and cooling to obtain the foamed phenolic resin glue solution impregnated paper-based friction material. The foamed phenolic resin glue solution impregnated paper-based friction material prepared by the method has the characteristics of excellent tensile strength and high porosity, but the method has more complex raw material components and higher requirements on equipment, and the friction and wear properties of the material prepared by the method are not evaluated.
The prior art for regulating and controlling the pore structure of the paper-based friction material has two defects, on one hand, the method and the way for regulating and controlling the pore structure of the material are single, and mainly change the thickness of the material or the hot-pressing curing parameters; on the other hand, in the prior art, the friction coefficient is improved by increasing the porosity, and meanwhile, the wear rate of the material is increased, which cannot realize the synchronous improvement of the friction and wear performance. Therefore, it is urgently needed to invent a method for effectively regulating and controlling a paper-based friction material, so that the material has a higher friction coefficient and a lower wear rate.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a preparation method of a paper-based friction material with high porosity, which is characterized in that a chemical foaming technology is introduced in the preparation process of the traditional paper-based friction material to effectively regulate and control the pore structure of the paper-based friction material, and the average pore size and the porosity of the material can be obviously improved after the hot press molding process is finished. The paper-based friction material prepared by the preparation method has the characteristics of high porosity, high friction coefficient, low wear rate and the like.
Technical scheme
A preparation method of a high-porosity paper-based friction material is characterized by comprising the following steps:
step 1: weighing 20-25% of chopped reinforced fiber, 10-15% of paper fiber, 30-40% of binder, 15-30% of friction performance regulator, 2-9% of organic chemical foaming agent and 2-7% of foaming auxiliary agent according to mass percentage; the sum of the mass of the components is 100%;
and 2, step: mixing the chopped reinforced fibers, the paper fibers, the friction performance regulator, the organic chemical foaming agent and water, and fully stirring to form uniformly dispersed slurry; pouring the uniformly dispersed slurry into a vacuum filter to manufacture a paper-based friction material wet preform, and then placing the paper-based friction material wet preform in a drying oven for drying;
and step 3: dissolving a foaming auxiliary agent in a liquid medium, electromagnetically stirring to completely dissolve the foaming auxiliary agent, immersing the dried wet prefabricated body of the paper-based friction material into the foaming auxiliary agent solution, taking out the wet prefabricated body after full immersion is finished, and drying the wet prefabricated body at room temperature; the mass ratio of the organic chemical foaming agent to the foaming auxiliary agent is 1-5: 1-4;
and 4, step 4: soaking the prefabricated body dried in the step (3) in a binder solution to enable the binder to uniformly permeate into the prefabricated body, taking out the prefabricated body after the soaking is finished, and drying the prefabricated body at room temperature;
and 5: preheating a vulcanizing machine to a foaming temperature, and then placing the dried prefabricated body into the vulcanizing machine for hot-pressing foaming, wherein the foaming time is 5-15min, the hot-pressing foaming temperature is 190 ℃ plus 150 ℃, and the hot-pressing pressure is 5-15 Mpa; and after the hot-pressing foaming process is finished, blanking to obtain the paper-based friction material with high porosity.
The reinforced fiber is one or more of carbon fiber, glass fiber, boron fiber, aramid fiber, acrylic fiber or polyimide fiber.
The binder is one or more of modified phenolic resin, modified epoxy resin, nitrile rubber, silicon rubber or thermoplastic engineering plastics.
The friction performance regulator is one or more of aluminum oxide, barium sulfate, chromite, mineral powder, zinc oxide, graphite, carbon black, talcum powder or silicon carbide.
The organic chemical foaming agent is one or more of N, N ' -dinitrosopentamethylenetetramine, N ' -dimethyl-N, N ' -dinitrosoterephthalamide, diazoaminobenzene, azodicarbonamide, azodiisobutyronitrile, azodicarboxylate, barium azodicarboxylate, benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, 4 ' -oxybis-benzenesulfonyl hydrazide, 1, 3-benzenesulfonyl hydrazide or 3,3 ' -disulfonyl hydrazide diphenyl sulfone.
The foaming auxiliary agent is one or more of urea, diethylene glycol, stearic acid, lauric acid, salicylic acid, zinc stearate, glycerol or sorbitol.
Advantageous effects
According to the preparation method of the high-porosity paper-based friction material, provided by the invention, the pore structure of the paper-based friction material is effectively regulated and controlled by introducing a chemical foaming technology in the traditional preparation process of the paper-based friction material, and the average pore size and porosity of the material can be obviously improved after the hot press molding process is finished.
The chemical foaming method is generally a process of foaming and molding a material by using a chemical foaming agent that is decomposed by heat during a processing process to release gas. Chemical blowing agents are characterized by the ability to decompose upon heating within a specified temperature range, releasing one or more gases, which make them suitable for polymers having melt viscosities within the specified temperature range. The chemical foaming method is mainly applied to the foaming of concrete, sponge and most thermoplastic plastics. According to the invention, a chemical foaming technology is introduced in the preparation process of the traditional paper-based friction material to effectively regulate and control the pore structure of the paper-based friction material, and the average pore size and porosity of the material can be obviously improved after the hot-press molding process is finished.
The beneficial effects of the invention are: the optimized preparation process of the paper-based friction material is invented by combining a chemical foaming technology with a preparation process of the paper-based friction material, and can overcome the defects that the existing regulation and control technology for the pore structure of the paper-based friction material is single and the friction and wear performance cannot be improved simultaneously. The chemical foaming technology is introduced into the preparation process of the paper-based friction material, so that the average pore diameter and porosity of the paper-based friction material can be obviously improved, the material can obtain higher dynamic friction coefficient and lower wear rate, the paper-based friction material with different pore structures can be obtained by changing the adding amount of the organic chemical foaming agent and the foaming auxiliary agent, and the regulation and control of the pore structure of the paper-based friction material are realized. The organic chemical foaming agent has small particle size, constant decomposition temperature, large gas forming amount and good dispersibility in the polymer, and the gas generated by heating decomposition is mainly nitrogen, the nitrogen has the minimum transmittance on the polymer and is not easy to escape from the foaming body, so that the nitrogen serving as the most effective foaming gas can obviously improve the foaming efficiency. The addition of the foaming auxiliary agent can effectively reduce the decomposition temperature of the organic foaming agent so as to be better matched with the melting temperature and the curing temperature of the binder, and can eliminate peculiar smell generated by decomposing residues while improving the foaming efficiency. The nucleation and growth of bubbles in the hot-pressing foaming process can generate extrusion force on the matrix, so that driving force is provided for the solidification of the matrix, the solidification degree of resin and the vulcanization degree of rubber can be improved, the strength of the material is further increased, and the wear rate is reduced. Paper-based friction material prepared by the invention, and average pore diameter and porosity of the paper-based friction materialRespectively reach 26.8-29.1 μm and 66.9-68.2%, and have dynamic friction coefficient of 0.164-0.176 and wear rate reduced to 1.98 × 10 -8 -1.48×10 -8 cm 3 and/J, a good open pore structure and excellent frictional wear performance are shown, and a solid foundation is laid for regulation and control of the pore structure of the paper-based friction material and optimization of the frictional wear performance.
Detailed Description
The invention will now be further described with reference to the following examples:
example 1:
the method comprises the following steps: weighing 2.1g of cashew nut shell oil modified phenolic resin powder, and dissolving the cashew nut shell oil modified phenolic resin powder in alcohol to prepare a phenolic resin solution with the mass fraction of 20%. Weighing 11.64ml of nitrile rubber solution with the mass fraction of 20 percent, pouring the nitrile rubber solution into the prepared phenolic solution, electromagnetically stirring the mixture for 10min under the condition of 1000r/min, and sealing and standing the mixture for 24h to fully mix the two solutions.
Step two: weighing 2.7g of reinforced fibers, namely 1.4g of carbon fibers and 1.3g of aramid fibers; 1.5g of paper fibers; 3.0g of friction performance regulator, namely 0.60g of alumina, 0.60g of chromite, 0.45g of mineral powder, 0.45g of zinc oxide, 0.39g of barium sulfate, 0.22g of talcum powder, 0.17g of graphite and 0.12g of carbon black; organic chemical foaming agent: 0.32g of N, N' -dinitrosopentamethylenetetramine.
Step three: the weighed reinforcing fibers, paper fibers, friction performance modifier and organic chemical foaming agent were mixed with 1500ml of water and stirred thoroughly in a stirrer at 2000r/min for 15min to form a uniformly dispersed slurry.
Step four: pouring the uniformly dispersed slurry into a vacuum filter, and carrying out vacuum filtration to manufacture a paper-based friction material wet preform.
Step five: and (4) drying the wet prefabricated body obtained in the fourth step in an oven at the temperature of 70 ℃.
Step six: 0.28g of foaming auxiliary agent urea is weighed and dissolved in 25ml of deionized water, and the mixture is fully stirred to be completely dissolved. And (3) soaking the dried paper-based friction material preform into a urea solution, taking out after full soaking is completed, and drying at room temperature.
Step seven: and (5) soaking the dried preform obtained in the sixth step into the binder prepared in the first step, taking out the preform after full soaking is completed, and drying the preform at room temperature to obtain a preformed sheet.
Step eight: and (3) placing the preformed sheet into a vulcanizing machine, carrying out hot-pressing foaming for 10min under the conditions that the pressure is 5MPa and the temperature is 160 ℃, and obtaining the paper-based friction material with the thickness of 0.75mm after foaming is finished.
The paper-based friction material prepared in this example had an average pore size of 26.81 μm, a porosity of 66.89%, a coefficient of dynamic friction of 0.1643, and a wear rate of 1.98x10 -8 cm 3 /J。
Example 2:
the method comprises the following steps: weighing 2.1g of cashew nut shell oil modified phenolic resin powder, and dissolving the cashew nut shell oil modified phenolic resin powder in alcohol to prepare a phenolic resin solution with the mass fraction of 20%. Weighing 11.64ml of nitrile rubber solution with the mass fraction of 20 percent, pouring the nitrile rubber solution into the prepared phenolic solution, electromagnetically stirring the mixture for 10min under the condition of 1000r/min, and sealing and standing the mixture for 24h to fully mix the two solutions.
Step two: weighing 2.7g of reinforcing fiber, namely 1.4g of carbon fiber and 1.3g of aramid fiber; 1.5g of paper fiber; 2.4g of friction performance regulator, namely 0.48g of alumina, 0.48g of chromite, 0.36g of mineral powder, 0.36g of zinc oxide, 0.31g of barium sulfate, 0.17g of talcum powder, 0.14g of graphite and 0.10g of carbon black; organic chemical foaming agent: 0.65g of N, N' -dinitroso pentamethylene tetramine.
Step three: the weighed reinforcing fiber, paper fiber, friction performance regulator and organic chemical foaming agent are mixed with 1500ml of water, and the mixture is fully stirred in a stirrer at the rotating speed of 2000r/min for 15min to form uniformly dispersed slurry.
Step four: pouring the uniformly dispersed slurry into a vacuum filter, and carrying out vacuum filtration to manufacture a paper-based friction material wet preform.
Step five: and (4) drying the wet prefabricated body obtained in the fourth step in an oven at the temperature of 70 ℃.
Step six: 0.55g of foaming auxiliary agent urea is weighed and dissolved in 25ml of deionized water, and the mixture is fully stirred to be completely dissolved. And (3) immersing the dried paper-based friction material preform into a urea solution, taking out after full immersion is finished, and drying at room temperature.
Step seven: and (5) soaking the dried preform obtained in the sixth step into the binder prepared in the first step, taking out the preform after full soaking is completed, and drying the preform at room temperature to obtain a preformed sheet.
Step eight: and (3) placing the preformed sheet into a vulcanizing machine, carrying out hot-pressing foaming for 10min under the conditions that the pressure is 5MPa and the temperature is 160 ℃, and obtaining the paper-based friction material with the thickness of 0.75mm after foaming is finished.
The paper-based friction material prepared in the example has an average pore size of 28.29 μm, a porosity of 68.08%, a dynamic friction coefficient of 0.1696, and a wear rate of 1.60x10 -8 cm 3 /J。
Example 3:
the method comprises the following steps: 2.1g of cashew nut shell oil modified phenolic resin powder is weighed and dissolved in alcohol to prepare phenolic resin solution with the mass fraction of 20%. Weighing 11.64ml of nitrile rubber solution with the mass fraction of 20 percent, pouring the nitrile rubber solution into the prepared phenolic solution, electromagnetically stirring the mixture for 10min under the condition of 1000r/min, and then sealing and standing the mixture for 24h to fully mix the two solutions.
Step two: weighing 2.7g of reinforced fibers, namely 1.4g of carbon fibers and 1.3g of aramid fibers; 1.5g of paper fibers; 1.8g of friction performance regulator, namely 0.36g of alumina, 0.36g of chromite, 0.27g of mineral powder, 0.27g of zinc oxide, 0.23g of barium sulfate, 0.12g of talcum powder, 0.11g of graphite and 0.08g of carbon black; organic chemical foaming agent: 0.97g of N, N' -dinitrosopentamethylenetetramine.
Step three: the weighed reinforcing fibers, paper fibers, friction performance modifier and organic chemical foaming agent were mixed with 1500ml of water and stirred thoroughly in a stirrer at 2000r/min for 15min to form a uniformly dispersed slurry.
Step four: pouring the uniformly dispersed slurry into a vacuum filter, and carrying out vacuum filtration to manufacture a paper-based friction material wet preform.
Step five: and (4) drying the wet prefabricated body obtained in the fourth step in an oven at the temperature of 70 ℃.
Step six: 0.83g of foaming auxiliary agent urea is weighed and dissolved in 25ml of deionized water, and the mixture is fully stirred to be completely dissolved. And (3) immersing the dried paper-based friction material preform into a urea solution, taking out after full immersion is finished, and drying at room temperature.
Step seven: and D, immersing the dried preform obtained in the step six into the binder prepared in the step one, taking out the preform after full immersion is finished, and drying the preform at room temperature to obtain a preformed sheet.
Step eight: and (3) placing the preformed sheet into a vulcanizing machine, carrying out hot-pressing foaming for 10min under the conditions that the pressure is 5MPa and the temperature is 160 ℃, and obtaining the paper-based friction material with the thickness of 0.75mm after foaming is finished.
The paper-based friction material prepared in the embodiment has the average pore diameter of 29.09 mu m, the porosity of 68.20%, the dynamic friction coefficient of 0.1756 and the wear rate of 1.48x10 -8 cm 3 /J。
Claims (3)
1. A preparation method of a high-porosity paper-based friction material is characterized by comprising the following steps:
step 1: weighing 20-25% of chopped reinforced fibers, 10-15% of paper fibers, 30-40% of binding agent, 15-30% of friction performance regulator, 2-9% of organic chemical foaming agent and 2-7% of foaming auxiliary agent according to the mass percentage; the sum of the mass of the components is 100 percent; the binder is a mixture of modified phenolic resin and nitrile rubber; the organic chemical foaming agent is N, N' -dinitrosopentamethylenetetramine; the foaming auxiliary agent is urea;
step 2: mixing the chopped reinforced fibers, the paper fibers, the friction performance regulator, the organic chemical foaming agent and water, and fully stirring to form uniformly dispersed slurry; pouring the uniformly dispersed slurry into a vacuum filter to manufacture a paper-based friction material wet prefabricated body, and then placing the paper-based friction material wet prefabricated body in a drying oven for drying;
and 3, step 3: dissolving a foaming aid in a liquid medium, performing electromagnetic stirring to completely dissolve the foaming aid, immersing the dried wet prefabricated body of the paper-based friction material into the foaming aid solution, taking out the wet prefabricated body after full immersion is completed, and drying the wet prefabricated body at room temperature; the mass ratio of the organic chemical foaming agent to the foaming auxiliary agent is 1-5: 1-4;
and 4, step 4: soaking the prefabricated body dried in the step 3 into a binder solution to enable the binder to uniformly permeate into the prefabricated body, taking out the prefabricated body after the soaking is finished, and drying the prefabricated body at room temperature;
and 5: preheating a vulcanizing machine to a foaming temperature, and then placing the dried prefabricated body into the vulcanizing machine for hot-pressing foaming, wherein the foaming time is 5-15min, the hot-pressing foaming temperature is 150-190 ℃, and the hot-pressing pressure is 5-15 Mpa; after the hot-pressing foaming process is finished, the paper-based friction material with high porosity is obtained through blanking; the average pore diameter and porosity of the high-porosity paper-based friction material are respectively 26.8-29.1 mu m and 66.9-68.2%, the dynamic friction coefficient is 0.164-0.176, and the wear rate is 1.98 multiplied by 10 -8 -1.48×10 -8 cm 3 /J。
2. The method for preparing the high-porosity paper-based friction material according to claim 1, characterized in that: the reinforced fiber is one or more of carbon fiber, glass fiber, boron fiber, aramid fiber, acrylic fiber or polyimide fiber.
3. The method for preparing the high-porosity paper-based friction material according to claim 1, characterized in that: the friction performance regulator is one or more of aluminum oxide, barium sulfate, mineral powder, zinc oxide, graphite, carbon black, talcum powder or silicon carbide.
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| CN112795133B (en) * | 2020-12-31 | 2023-01-17 | 湖北飞龙摩擦密封材料股份有限公司 | Sheet molding compound for preparing friction material and preparation method thereof |
| CN113123162A (en) * | 2021-04-09 | 2021-07-16 | 西北工业大学 | Preparation method of double-substrate paper-based friction material with excellent performance |
| CN114197250B (en) * | 2021-11-29 | 2023-02-10 | 华南理工大学 | Wet paper-based friction material based on foam molding and preparation method thereof |
| CN114437707B (en) * | 2022-02-10 | 2023-01-31 | 北京昆仑隆源石油开采技术有限公司 | Self-suspending proppant and preparation method thereof |
| CN116925495B (en) * | 2023-09-15 | 2023-11-28 | 成都超德创科技有限公司 | Resin-based electromagnetic brake friction material and preparation method thereof |
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| JPH0618897B2 (en) * | 1986-09-08 | 1994-03-16 | アイシン化工株式会社 | Dry friction material and manufacturing method thereof |
| JP2915444B2 (en) * | 1989-10-26 | 1999-07-05 | 昭和高分子株式会社 | Wet friction material |
| JP2006249244A (en) * | 2005-03-10 | 2006-09-21 | Tanaka Seimitsu Kogyo Kk | Friction material |
| CN106948210B (en) * | 2017-02-23 | 2018-06-19 | 华南理工大学 | A kind of method that foaming process prepares fibre reinforced composites |
| CN108978346A (en) * | 2018-07-11 | 2018-12-11 | 薛向东 | A kind of preparation method of foam resin glue immersion-type paper friction material |
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