CN108978346A - A kind of preparation method of foam resin glue immersion-type paper friction material - Google Patents
A kind of preparation method of foam resin glue immersion-type paper friction material Download PDFInfo
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- CN108978346A CN108978346A CN201810759239.5A CN201810759239A CN108978346A CN 108978346 A CN108978346 A CN 108978346A CN 201810759239 A CN201810759239 A CN 201810759239A CN 108978346 A CN108978346 A CN 108978346A
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/48—Condensation polymers of aldehydes or ketones with phenols
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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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/56—Polyamines; Polyimines; Polyester-imides
-
- 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
- D21H17/66—Salts, e.g. alums
-
- 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
- D21H21/06—Paper forming aids
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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Abstract
The invention discloses a kind of preparation methods of foam resin glue immersion-type paper friction material, belong to automotive material technical field.After the present invention first mixes pf resin of low molecular weight, polyimide resin, water, dehydrated alcohol, emulsifier, thickener, polyacrylamide, chromic salts and auxiliary agent, constant temperature is stirred to react, and it is continually fed into carbon dioxide gas during the reaction, foam resin glue is made；It after the handsheet of paper friction material body paper is cut again, is immersed in inside foam resin glue, heat preservation dipping obtains dipping handsheet；It is hot-forming that handsheet will then be impregnated, it is cooling to get foam resin glue immersion-type paper friction material.The foam resin glue immersion-type paper friction material of technical solution of the present invention preparation has the characteristics that excellent tensile intensity and porosity are high, has broad prospects in the development of automotive material technology industry.
Description
Technical field
The invention discloses a kind of preparation methods of foam resin glue immersion-type paper friction material, belong to automobile
Field of material technology.
Background technique
Paper friction material is mainly made of fiber, adhesive, filler, regulator with frictional behaviour etc., is usually adopted
It is manufactured with the mode (slurrying and copy paper) of papermaking, therefore is called paper friction material.Adhesive is paper friction material
Important component, resin (such as phenolic resin) is most common adhesive, is rubbed to paper base
The frictional behaviour for wiping material has great influence.
The most significant feature of paper friction material is: 1, having used organic fiber, elasticity is good, and antithesis disk is practical contacts
Ratio (i.e. the ratio of real contact area and apparent contact area) 1~2 order of magnitude bigger than metal base frication material;2, coarse
The cooling of surface and porous structure and material, adsorbent are closely related to boundary lubricant film and the effect of hydrodynamic lubrication film.Cause
And paper friction material is at low cost, dynamic friction factor is stable, sound friction factor ratio is close, coating performance is steady, abrasion
The advantages that rate is low, long service life, noise are small and can protect mating material, oneself is developed into a kind of important friction material,
Start gradually to substitute resin-matrix friction material and metal base frication material, is widely used in automobile, motorcycle, tractor, builds
In the automatic transmission and brake for building the various types of vehicles such as mining machinery, metal forming machinery and engineering machinery.
Tribology is the subject of research a contact interface mechanical behavior and micromechanism of damage, is a complicated subject, it
Cover the subjects such as contact mechanics, thermal conduction study, hydrodynamics, chemistry, physics, materialogy, mechanics.Therefore, paper base friction
The frictional behaviour and complicated mechanism of material, influence factor are numerous.Paper friction material is a kind of material to work in the oil, lubrication
State not only has an important influence on the friction of material and polishing machine, but also related with frictional vibration, friction noise.
And conventionally employed phenolic resin, in paper friction material dipping process, glue is difficult to penetrate sufficiently into write by hand
The shortcomings that inside piece, pickling efficiency is low, and after impregnating, the porosity of product lower problem, brings certain to practical application
Difficulty, therefore this is also the urgent problem in terms of phenolic resin is to paper friction material at present.
Summary of the invention
The present invention solves the technical problem of: for conventionally employed phenolic resin to paper friction material dipping process
In, glue is difficult to penetrate sufficiently into inside handsheet, and pickling efficiency is low, and after dipping, the porosity of product is lower to be asked
Topic, provides a kind of preparation method of foam resin glue immersion-type paper friction material.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
A kind of preparation method of foam resin glue immersion-type paper friction material, specific preparation step are as follows:
(1) according to parts by weight, 80~100 parts of pf resin of low molecular weight are successively taken, 20~30 parts of polyimide resins, 100
~120 parts of water, 20 ~ 30 parts of dehydrated alcohols, 20~30 parts of emulsifiers, 8~10 parts of thickeners, 6~8 parts of polyacrylamides, 2~4
Part chromic salts, 10~15 parts of auxiliary agents, constant temperature are stirred to react, and are continually fed into carbon dioxide gas during the reaction, to the end of reacting,
Obtain foam resin glue；
(2) it after cutting the handsheet of paper friction material body paper, is immersed in inside foam resin glue, heat preservation dipping,
Handsheet must be impregnated；
(3) it is hot-forming that handsheet will be impregnated, it is cooling to get foam resin glue immersion-type paper friction material.
It is 1800~2000 that step (1) described pf resin of low molecular weight, which is average molecular weight, and solid content is 20~30%,
Viscosity be 20~30s(25 DEG C) phenolic resin.
Step (1) emulsifier is neopelex, dodecyldimethylammonium hydroxide inner salt, isooctanol sulfuric acid
Any one in sodium, emulsifier op-10, Tween-60 or Si Pan -80.
Step (1) thickener is any one in polyvinyl alcohol, carboxymethyl cellulose, chitosan or gelatin.
Step (1) described polyacrylamide is the anionic polyacrylamide that molecular weight is 600~12,000,000.
Step (1) chromic salts is any one in chromium chloride, chromic nitrate or chromium sulfate.
Step (1) described auxiliary agent is hexamethylenetetramine and N-N dimethyl acetamide is 3:1~8:1 compounding in mass ratio
It forms.
The beneficial effects of the present invention are:
(1) technical solution of the present invention impregnates paper friction material with the phenolic resin glue of foam type, in phenolic resin
In glue process for preparation, using emulsifier as foaming agent, under stirring, it is dispersed in air and partial CO 2 gas
In liquid medium, and it is converted into the foam with good stability and particle diameter distribution, in subsequent dipping process, with air and two
The medium that carbonoxide applies as remaining effective component makes it by being distributed in handsheet surface or penetrate into handsheet hole knot
It inside structure, is ruptured after part foam contacting to handsheet substrate in dipping process, with the liquid-sheet disintegration of foam, makes it
It is changed into liquid medium and is absorbed by capillary effect by handsheet, and foam can produce biggish impact in rupture process
Power facilitates liquid medium and further penetrates into inside handsheet, so that dipping effect be made effectively to be promoted；
(2) present invention is by being aided with polyimide resin, first in resin adhesive liquid process for preparation, by being passed through carbon dioxide gas
Body makes primary amino group and carbon dioxide reaction in polyimide resin, and multiple primary amino groups in its molecular structure is made to pass through salt bridge
Connection, to form cross-linked network, the formation of cross-linked network is conducive to improve the foam stability in resin adhesive liquid, in addition, also
Be conducive to polyimide resin and form cross-linked network on handsheet surface, so that it is not easily accessed handsheet internal void, rear
Continue it is hot-forming during, be conducive to the holding of system interior porosity, and the cross-linked network that carbon dioxide and polyimides are formed
Network is unstable, and in hot pressing, carbon dioxide can volatilize again, play the role of pore in volatilization process, is conducive in system
The further promotion in portion and surface porosity factor；
(3) by the way that using chromium ion as crosslinking agent, anionic polyacrylamide is foam stabilizer, emulsifier is technical solution of the present invention
Infusion forms foam-like gel, is stable in the presence of bubble in system, to improve foam phenolic aldehyde in glue process for preparation
The foam stability of resin adhesive liquid is conducive to the promotion of dipping effect in dipping process.
Specific embodiment
According to parts by weight, 80~100 parts of pf resin of low molecular weight are successively taken, 20~30 parts of polyimide resins, 100
~120 parts of water, 20 ~ 30 parts of dehydrated alcohols, 20~30 parts of emulsifiers, 8~10 parts of thickeners, 6~8 parts of polyacrylamides, 2~4
Thickener and water are first added in reaction kettle, are stirred 10 with 300~500r/min revolving speed by part chromic salts, 10~15 parts of auxiliary agents
After~15min, under room temperature, standing 8~12h of swelling, after being swollen, then low molecule is sequentially added into reaction kettle
Measure phenolic resin, polyimide resin, dehydrated alcohol, emulsifier, thickener, polyacrylamide and chromic salts, then with 600~
800mL/min rate is continually fed into carbon dioxide gas into reaction kettle, in temperature be 40~45 DEG C, revolving speed be 1200~
Under the conditions of 1600r/min, after constant temperature is stirred to react 3~5h, discharging obtains foam resin glue；By paper friction material original
After the handsheet of paper is cut, it is immersed in inside foam resin glue, under the conditions of temperature is 40~45 DEG C, heat preservation dipping 6
After~8h, handsheet is taken out, obtains dipping handsheet；Again by gained dipping handsheet be transferred in hot press, in temperature be 140~
160 DEG C, hot-forming under the conditions of pressure is 15~20MPa, discharging, cooled to room temperature is to get foam resin glue
Immersion-type paper friction material.The pf resin of low molecular weight is that average molecular weight is 1800~2000, solid content be 20~
30%, viscosity be 20~30s(25 DEG C) phenolic resin.The emulsifier is neopelex, dodecyl dimethyl
Any one in glycine betaine, isooctanol sodium sulphate, emulsifier op-10, Tween-60 or Si Pan -80.The thickener is poly- second
Any one in enol, carboxymethyl cellulose, chitosan or gelatin.The polyacrylamide is that molecular weight is 600~1200
Ten thousand anionic polyacrylamide.The chromic salts is any one in chromium chloride, chromic nitrate or chromium sulfate.The auxiliary agent is six
Methine tetramine and N-N dimethyl acetamide are that 3:1~8:1 is compounded in mass ratio.
According to parts by weight, 100 parts of pf resin of low molecular weight are successively taken, 30 parts of polyimide resins, 120 parts of water, 20 ~
30 parts of dehydrated alcohols, 30 parts of emulsifiers, 10 parts of thickeners, 8 parts of polyacrylamides, 4 parts of chromic salts, 15 parts of auxiliary agents, first by thickener
It is added in reaction kettle with water, after being stirred 15min with 500r/min revolving speed, under room temperature, standing swelling 12h, to molten
After swollen, then pf resin of low molecular weight, polyimide resin, dehydrated alcohol, emulsifier, increasing are sequentially added into reaction kettle
Thick dose, polyacrylamide and chromic salts are then continually fed into carbon dioxide gas, Yu Wen into reaction kettle with 800mL/min rate
Degree is 45 DEG C, and under the conditions of revolving speed is 1600r/min, after constant temperature is stirred to react 5h, discharging obtains foam resin glue；By paper
It after the handsheet of base frication material body paper is cut, is immersed in inside foam resin glue, under the conditions of temperature is 45 DEG C, protects
After temperature dipping 8h, handsheet is taken out, dipping handsheet is obtained；Gained dipping handsheet is transferred in hot press again, is in temperature
160 DEG C, hot-forming under the conditions of pressure is 20MPa, discharging, cooled to room temperature is to get foam resin glue dipping
Type paper friction material.The pf resin of low molecular weight is that average molecular weight is 2000, solid content 30%, viscosity 30s
The phenolic resin of (25 DEG C).The emulsifier is neopelex.The thickener is polyvinyl alcohol.The polypropylene
Amide is the anionic polyacrylamide that molecular weight is 12,000,000.The chromic salts is chromium chloride.The auxiliary agent is six methines four
Amine and N-N dimethyl acetamide are that 8:1 is compounded in mass ratio.
According to parts by weight, 100 parts of pf resin of low molecular weight are successively taken, 120 parts of water, 20 ~ 30 parts of dehydrated alcohols, 30 parts
First thickener and water are added in reaction kettle for emulsifier, 10 parts of thickeners, 8 parts of polyacrylamides, 4 parts of chromic salts, 15 parts of auxiliary agents,
After being stirred 15min with 500r/min revolving speed, under room temperature, swelling 12h is stood, after being swollen, then to reaction
Pf resin of low molecular weight, dehydrated alcohol, emulsifier, thickener, polyacrylamide and chromic salts are sequentially added in kettle, then with
800mL/min rate is continually fed into carbon dioxide gas into reaction kettle, is 45 DEG C in temperature, revolving speed is 1600r/min condition
Under, after constant temperature is stirred to react 5h, discharging obtains foam resin glue；After the handsheet of paper friction material body paper is cut,
It is immersed in inside foam resin glue, under the conditions of temperature is 45 DEG C, after heat preservation dipping 8h, handsheet is taken out, must be soaked
Stain handsheet；Again by gained dipping handsheet be transferred in hot press, in temperature be 160 DEG C, pressure be 20MPa under the conditions of, hot pressing
Molding, discharging, cooled to room temperature is to get foam resin glue immersion-type paper friction material.The low molecular weight
Phenolic resin is that average molecular weight is 2000, solid content 30%, viscosity be 30s(25 DEG C) phenolic resin.The emulsifier is
Neopelex.The thickener is polyvinyl alcohol.The polyacrylamide is the anion that molecular weight is 12,000,000
Polyacrylamide.The chromic salts is chromium chloride.The auxiliary agent is hexamethylenetetramine and N-N dimethyl acetamide is in mass ratio
8:1 is compounded.
According to parts by weight, 100 parts of pf resin of low molecular weight are successively taken, 30 parts of polyimide resins, 120 parts of water, 20 ~
30 parts of dehydrated alcohols, 30 parts of emulsifiers, 10 parts of thickeners, 8 parts of polyacrylamides, 4 parts of chromic salts, 15 parts of auxiliary agents, first by thickener
It is added in reaction kettle with water, after being stirred 15min with 500r/min revolving speed, under room temperature, standing swelling 12h, to molten
After swollen, then pf resin of low molecular weight, polyimide resin, dehydrated alcohol, emulsifier, increasing are sequentially added into reaction kettle
Thick dose, polyacrylamide and chromic salts, in temperature be 45 DEG C, revolving speed be 1600r/min under the conditions of, after constant temperature is stirred to react 5h, out
Material, obtains foam resin glue；After the handsheet of paper friction material body paper is cut, it is immersed in foam resin glue
Under the conditions of temperature is 45 DEG C after heat preservation dipping 8h, handsheet is taken out, dipping handsheet is obtained in inside；Gained is impregnated into hand again
Handsheet is transferred in hot press, is 160 DEG C in temperature, hot-forming under the conditions of pressure is 20MPa, discharging naturally cools to room
Temperature is to get foam resin glue immersion-type paper friction material.The pf resin of low molecular weight is that average molecular weight is
2000, solid content 30%, viscosity be 30s(25 DEG C) phenolic resin.The emulsifier is neopelex.It is described
Thickener is polyvinyl alcohol.The polyacrylamide is the anionic polyacrylamide that molecular weight is 12,000,000.The chromic salts is
Chromium chloride.The auxiliary agent is hexamethylenetetramine and N-N dimethyl acetamide is that 8:1 is compounded in mass ratio.
According to parts by weight, 100 parts of pf resin of low molecular weight are successively taken, 30 parts of polyimide resins, 120 parts of water, 20 ~
30 parts of dehydrated alcohols, 30 parts of emulsifiers, 8 parts of polyacrylamides, 4 parts of chromic salts, 15 parts of auxiliary agents sequentially add low point into reaction kettle
Son amount phenolic resin, polyimide resin, dehydrated alcohol, emulsifier, polyacrylamide and chromic salts, then with 800mL/min speed
Rate is continually fed into carbon dioxide gas into reaction kettle, is 45 DEG C in temperature, under the conditions of revolving speed is 1600r/min, constant temperature is stirred
After reacting 5h, discharging obtains foam resin glue；After the handsheet of paper friction material body paper is cut, it is immersed in foam
Inside phenolic resin glue, under the conditions of temperature is 45 DEG C, after heat preservation dipping 8h, handsheet is taken out, dipping handsheet is obtained；Again
By gained dipping handsheet be transferred in hot press, in temperature be 160 DEG C, pressure be 20MPa under the conditions of, it is hot-forming, discharging, from
So it is cooled to room temperature to get foam resin glue immersion-type paper friction material.The pf resin of low molecular weight is flat
Average molecular weight is 2000, solid content 30%, viscosity be 30s(25 DEG C) phenolic resin.The emulsifier is detergent alkylate sulphur
Sour sodium.The polyacrylamide is the anionic polyacrylamide that molecular weight is 12,000,000.The chromic salts is chromium chloride.It is described to help
Agent is hexamethylenetetramine and N-N dimethyl acetamide is that 8:1 is compounded in mass ratio.
According to parts by weight, 100 parts of pf resin of low molecular weight are successively taken, 30 parts of polyimide resins, 120 parts of water, 20 ~
First thickener and water are added in reaction kettle for 30 parts of dehydrated alcohols, 30 parts of emulsifiers, 10 parts of thickeners, 15 parts of auxiliary agents, with
After 500r/min revolving speed is stirred 15min, under room temperature, swelling 12h is stood, after being swollen, then to reaction kettle
In sequentially add pf resin of low molecular weight, polyimide resin, dehydrated alcohol, emulsifier, thickener, then with 800mL/
Min rate is continually fed into carbon dioxide gas into reaction kettle, in temperature be 45 DEG C, revolving speed be 1600r/min under the conditions of, constant temperature
After being stirred to react 5h, discharging obtains foam resin glue；After the handsheet of paper friction material body paper is cut, it is immersed in
Inside foam resin glue, under the conditions of temperature is 45 DEG C, after heat preservation dipping 8h, handsheet is taken out, dipping write by hand is obtained
Piece；Again by gained dipping handsheet be transferred in hot press, in temperature be 160 DEG C, pressure be 20MPa under the conditions of, it is hot-forming, out
Material, cooled to room temperature is to get foam resin glue immersion-type paper friction material.The pf resin of low molecular weight
Be 2000 for average molecular weight, solid content 30%, viscosity be 30s(25 DEG C) phenolic resin.The emulsifier is dodecyl
Benzene sulfonic acid sodium salt.The thickener is polyvinyl alcohol.The auxiliary agent be hexamethylenetetramine and N-N dimethyl acetamide in mass ratio
It is compounded for 8:1.
According to parts by weight, 100 parts of pf resin of low molecular weight are successively taken, 30 parts of polyimide resins, 120 parts of water, 20 ~
30 parts of dehydrated alcohols, 15 parts of auxiliary agents sequentially add pf resin of low molecular weight, polyimide resin, anhydrous second into reaction kettle
Alcohol, under the conditions of revolving speed is 1600r/min, after constant temperature is stirred to react 5h, discharging obtains foam resin glue；Paper base is rubbed
After the handsheet of material body paper is cut, it is immersed in inside foam resin glue, under the conditions of temperature is 45 DEG C, heat preservation dipping
After 8h, handsheet is taken out, obtains dipping handsheet；Again by gained dipping handsheet be transferred in hot press, in temperature be 160 DEG C,
Hot-forming under the conditions of pressure is 20MPa, discharging, cooled to room temperature is to get foam resin glue immersion-type paper base
Friction material.The pf resin of low molecular weight is that average molecular weight is 2000, solid content 30%, and viscosity is 30s(25 DEG C)
Phenolic resin.The auxiliary agent is hexamethylenetetramine and N-N dimethyl acetamide is that 8:1 is compounded in mass ratio.
Comparative example: the immersion-type paper friction material of Guangdong Chemical Co., Ltd. production.
Example 1 to the resulting foam resin glue immersion-type paper friction material of example 6 and comparative example product are carried out
Performance detection, the specific detection method is as follows:
Test specimen dipping is carried out to the handsheet of paper friction material body paper respectively, hot pressing then is carried out to the handsheet after dipping,
Measure after hot pressing handsheet porosity after different handsheet tensile strength and hot pressing.
Specific testing result is as shown in table 1:
The 1 specific testing result of foam resin glue immersion-type paper friction material of table
By 1 testing result of table it is found that the foam resin glue immersion-type paper friction material of technical solution of the present invention preparation
Have the characteristics that excellent tensile intensity and porosity are high, has broad prospects in the development of automotive material technology industry.
Claims (7)
1. a kind of preparation method of foam resin glue immersion-type paper friction material, it is characterised in that specific preparation step
Are as follows:
(1) according to parts by weight, 80~100 parts of pf resin of low molecular weight are successively taken, 20~30 parts of polyimide resins, 100
~120 parts of water, 20 ~ 30 parts of dehydrated alcohols, 20~30 parts of emulsifiers, 8~10 parts of thickeners, 6~8 parts of polyacrylamides, 2~4
Part chromic salts, 10~15 parts of auxiliary agents, constant temperature are stirred to react, and are continually fed into carbon dioxide gas during the reaction, to the end of reacting,
Obtain foam resin glue；
(2) it after cutting the handsheet of paper friction material body paper, is immersed in inside foam resin glue, heat preservation dipping,
Handsheet must be impregnated；
(3) it is hot-forming that handsheet will be impregnated, it is cooling to get foam resin glue immersion-type paper friction material.
2. a kind of preparation method of foam resin glue immersion-type paper friction material according to claim 1,
It is characterized in that step (1) described pf resin of low molecular weight be average molecular weight is 1800~2000, solid content is 20~30%,
Viscosity be 20~30s(25 DEG C) phenolic resin.
3. a kind of preparation method of foam resin glue immersion-type paper friction material according to claim 1,
It is characterized in that step (1) emulsifier is neopelex, dodecyldimethylammonium hydroxide inner salt, isooctanol sulfuric acid
Any one in sodium, emulsifier op-10, Tween-60 or Si Pan -80.
4. a kind of preparation method of foam resin glue immersion-type paper friction material according to claim 1,
It is characterized in that step (1) thickener is any one in polyvinyl alcohol, carboxymethyl cellulose, chitosan or gelatin.
5. a kind of preparation method of foam resin glue immersion-type paper friction material according to claim 1,
It is characterized in that step (1) described polyacrylamide is the anionic polyacrylamide that molecular weight is 600~12,000,000.
6. a kind of preparation method of foam resin glue immersion-type paper friction material according to claim 1,
It is characterized in that step (1) chromic salts is any one in chromium chloride, chromic nitrate or chromium sulfate.
7. a kind of preparation method of foam resin glue immersion-type paper friction material according to claim 1,
It is characterized in that step (1) described auxiliary agent is hexamethylenetetramine and N-N dimethyl acetamide is 3:1~8:1 compounding in mass ratio
It forms.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN110965385A (en) * | 2019-12-24 | 2020-04-07 | 西北工业大学 | Preparation method of pore structure optimized paper-based friction material |
| CN112064401A (en) * | 2020-09-02 | 2020-12-11 | 西北工业大学 | Preparation method of high-porosity paper-based friction material |
| CN112795133A (en) * | 2020-12-31 | 2021-05-14 | 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 |
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| CN110344281A (en) * | 2019-03-11 | 2019-10-18 | 湖北文理学院 | A kind of paper grade (stock) mixed emulsifying stabilizer and preparation method thereof |
| CN110965385A (en) * | 2019-12-24 | 2020-04-07 | 西北工业大学 | Preparation method of pore structure optimized paper-based friction material |
| CN112064401A (en) * | 2020-09-02 | 2020-12-11 | 西北工业大学 | Preparation method of high-porosity paper-based friction material |
| CN112795133A (en) * | 2020-12-31 | 2021-05-14 | 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 |
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Application publication date: 20181211 |