CN106868902B - A kind of preparation method of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material - Google Patents
A kind of preparation method of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material Download PDFInfo
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- CN106868902B CN106868902B CN201710042285.9A CN201710042285A CN106868902B CN 106868902 B CN106868902 B CN 106868902B CN 201710042285 A CN201710042285 A CN 201710042285A CN 106868902 B CN106868902 B CN 106868902B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/023—Cleaning wood chips or other raw materials
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
- D21C3/16—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides nitrogen oxides; nitric acid nitrates, nitrites
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Abstract
The invention discloses a kind of preparation methods of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material, carbon fiber is pre-processed using acid solution oxidizing process, then utilize redox reaction in carbon fiber surface growth in situ sheet self assembly manganese dioxide using potassium permanganate and the concentrated sulfuric acid, and it is with large specific surface area, easily and many advantages, such as resin-bonded, as friction material reinforcement, applied to wet type resin-matrix friction material, can effectively increased fiber and resin-bonded specific surface area, and then improve the interfacial combined function of carbon fiber and matrix, make friction material that there is more excellent friction and wear behavior.
Description
Technical field
The invention belongs to Wet-type friction material fields, and in particular to a kind of sheet self assembly manganese dioxide modified carbon fiber increasing
The preparation method of strong resin-matrix friction material.
Background technique
Resin-matrix friction material is a kind of sufficiently mixed by the warp such as adhesive (resin), reinforcing fiber and frictional property regulator
Hot-forming a kind of multi-element composite material after closing uniformly, has that friction and wear behavior is excellent, preparation process is simple, performance can be set
The advantages that meter property is strong and at low cost, application is more and more wider.
It is " a kind of to utilize potassium persulfate/silver nitrate system to carbon fiber surface that application No. is the Chinese patents of CN103450501A
Carbon fiber is put into Soxhlet extractor extraction tube by the modified method in face ", carries out Soxhlet extraction removal of impurities by extractant of acetone, i.e.,
It is condensed back reaction 4h~8h at being 75~85 DEG C in temperature, the carbon fiber after obtaining removal surface impurity, after acetone is cleaned
Carbon fiber be placed in overcritical acetone-aqueous systems that temperature is 350~380 DEG C and pressure is 7~15MPa impregnate 15~
30min, to remove the epoxy coating of carbon fiber, although this method can be very good removal epoxy coating, but to experiment item
Part is more demanding, is unfavorable for engineer application.
Application No. is the Chinese patent of CN104195824A " a kind of carbon fiber surface modification method " using acetone 60~
Under conditions of 100 DEG C, the sizing agent and impurity of carbon fiber surface are purged, carbon fiber is placed in round bottom after cleaning, drying and is burnt
It in bottle, being added in concentrated acid, aoxidizes 2~5h at 60~80 DEG C, the carbon fiber after obtained oxidation impregnates 5 in distilled water~
10min, then takes out the carbon fiber after impregnating in distilled water, and reject distilled water repeats the above steps 5~10 times and just obtains
Pretreated carbon fiber.This method repeats that step is more, cumbersome time-consuming during the experiment.
Summary of the invention
The purpose of the present invention is to provide a kind of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base friction materials
The preparation method of material, to overcome the problems of the above-mentioned prior art, the present invention using sheet self assembly manganese dioxide by being changed
Property after carbon fiber the resin-matrix friction material of the features such as coefficient of friction is high, abrasion loss is low is prepared as fibre reinforcement.
In order to achieve the above objectives, the present invention adopts the following technical scheme that：
A kind of preparation method of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material, including it is following
Step：
Step 1：Carbon fiber Wesy acetone soln is impregnated, after the sizing agent of carbon fiber to be removed, carbon fiber is washed repeatedly
To neutrality and dry；
Step 2：The carbon fiber of step 1 drying and concentrated nitric acid are mixed to get carbon fiber mixed system, carbon fiber is mixed
Zoarium system is heated to 80~90 DEG C of 2~4h of reaction, is cooled to room temperature after the reaction was completed carbon fiber deionized water and ethyl alcohol is anti-
Complex Alternating, which is washed, to be neutral to solution and dries；
Step 3：The carbon fiber and solid potassium permanganate mixed grinding for taking step 2 to obtain, are put into distilled water for mixture
Middle stirring is stirred after the concentrated sulfuric acid then is added, and is then heated obtained mixed solution, is obtained sheet self assembly manganese dioxide and change
Property carbon fiber crude product, modified carbon fiber crude product is washed repeatedly to neutral and obtained by drying to modified carbon fiber；
Step 4：Modified carbon fiber, aramid fiber, paper fiber are dispersed in water using wet process pulping process, it is then sharp
Fibre reinforced materials is made with copy paper moulding process；
Step 5：Hot-press solidifying is carried out after fibre reinforced materials is impregnated using phenol-formaldehyde resin modified to obtain resin base and rub
Wipe material.
Further, carbon fiber Wesy acetone soln is impregnated into 36~48h in step 1.
Further, in step 2 by carbon fiber and concentrated nitric acid with 1：50 mass ratio mixes to obtain carbon fiber mixture
System.
Further, the mass ratio of carbon fiber and potassium permanganate is 1 in step 3:10；By carbon fiber and height in step 3
Potassium manganate is blended in 8~15min of grinding in mortar.
Further, ground mixture is put into distilled water in step 3 and stirs 10h, dense sulphur is then added dropwise
1h is stirred after acid, wherein 2.2g mixture is added in every 200mL distilled water, it is dense that 0.5~1.5mL is added in every 200mL distilled water
Sulfuric acid.
Further, in step 3 by mixed solution 80~160 DEG C at a temperature of heat 2~6h, obtain sheet from group
Fill the modified carbon fiber crude product of manganese dioxide.
Further, in step 4 by modified carbon fiber, aramid fiber, paper fiber according to (9~13) ﹕ (2~3) ﹕ (2~
3) mass ratio is dispersed in water, and fibre reinforced materials then is made using copy paper moulding process.
Further, the mass ratio of phenol-formaldehyde resin modified and modified carbon fiber is (6~8) ﹕ (3~5) in step 5.
Further, in step 5 hot-press solidifying temperature be 150~180 DEG C, the time be 8~15min, pressure be 5~
10MPa。
Further, carbon fiber is polyacrylonitrile-based carbon fibre or asphalt base carbon fiber in step 1；Paper in step 4
Fiber is wood-fibred or bamboo fibre；Aramid fiber is be chopped aramid fiber, precipitating aramid fiber or Fanglun slurry cake.
Compared with prior art, the invention has the following beneficial technical effects：
Carbon fiber is pre-processed using acid solution oxidizing process in the present invention, is then utilized using potassium permanganate and the concentrated sulfuric acid
Redox reaction is in carbon fiber surface growth in situ sheet self assembly manganese dioxide, and it is with large specific surface area, Yi Yushu
Many advantages, such as rouge combines is applied to wet type resin-matrix friction material, can effectively increase as friction material reinforcement
The specific surface area of fiber and resin-bonded, and then the interfacial combined function of carbon fiber and matrix is improved, there is friction material more
For excellent friction and wear behavior.
Further, by control condition, the method for the present invention makes the modified carbon fiber preparation of sheet self assembly manganese dioxide
Resin-matrix friction material wear rate be reduced to original carbon fiber preparation resin-matrix friction material 1/9 or so, side of the present invention
The resin-matrix friction material of method preparation has excellent friction and wear behavior, detects according to GB/T 13826-2008 technical standard,
Its dynamic friction coefficient reaches 0.09~0.16, and friction material wear rate is 1.88 × 10-9cm3/ J~1.62 × 10-8cm3/ J, exhibition
Excellent friction and wear behavior and wear-resisting property are revealed.
Detailed description of the invention
Fig. 1 is the SEM figure that carbon fiber surface grows sheet self assembly manganese dioxide, and wherein a is the SEM figure for amplifying 5k times；b
For 50k times of amplification of SEM figure；
Fig. 2 is the resin-matrix friction material prepared with sheet self assembly manganese dioxide modified carbon fiber and original carbon fiber system
Standby resin-matrix friction material wear rate comparison diagram, wherein CF0：Original carbon fiber reinforced resin base frication material；CF1：Sheet
Self assembly manganese dioxide modified carbon fiber reinforced resin base frication material.
Specific embodiment
The invention will be described in further detail below：
A kind of preparation method of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material, including it is following
Step：
Step 1：By carbon fiber (polyacrylonitrile-based carbon fibre or asphalt base carbon fiber) that length is 0.1~10mm with third
Ketone solution impregnates 36~48h, after the sizing agent of carbon fiber to be removed, carbon fiber is washed repeatedly to neutrality and at 60~80 DEG C
Drying 12~for 24 hours；
Step 2：By the carbon fiber of step 1 drying and concentrated nitric acid with 1：50 mass ratio is mixed to get carbon fiber mixture
System, carbon fiber mixed system is heated to 80~90 DEG C of 2~4h of reaction, be cooled to room temperature after the reaction was completed by carbon fiber spend from
Sub- water and ethyl alcohol alternately and repeatedly wash 3~5 times to solution be the neutral and drying 12~for 24 hours at 60~80 DEG C；
Step 3：Take the carbon fiber and solid potassium permanganate that step 2 obtains by 1:10 quality than mixed grinding 8~
Mixture is put into distilled water and stirs 10h by 15min, stirs 1h after the concentrated sulfuric acid then is added, wherein in every 200mL distilled water
2.2g mixture is added, 0.5~1.5mL concentrated sulfuric acid is added in every 200mL distilled water, by obtained mixed solution 80~160
2~6h is heated at a temperature of DEG C, obtains the modified carbon fiber crude product of sheet self assembly manganese dioxide, modified carbon fiber is slightly produced
Product washed repeatedly to neutrality and at 60~80 DEG C drying 12~obtain modified carbon fiber for 24 hours；
Step 4：Using wet process pulping process, by modified carbon fiber, aramid fiber, (aramid fiber that is chopped, precipitating aramid fiber are fine
Dimension or Fanglun slurry cake), paper fiber (wood-fibred or bamboo fibre) is according to ((mass ratio of 2~3) ﹕ (2~3) is scattered in water to 9~13) ﹕
In, fibre reinforced materials then is made using copy paper moulding process；
Step 5：By fibre reinforced materials using phenol-formaldehyde resin modified dipping after temperature be 150~180 DEG C, pressure 5
8~15min of hot-press solidifying is carried out under conditions of~10MPa, wherein the mass ratio of phenol-formaldehyde resin modified and modified carbon fiber is (6
~8) ﹕ (3~5) to get arrive resin-matrix friction material.
Below with reference to embodiment, the invention will be described in further detail：
Embodiment 1
Step 1：Length is soaked into 48h with acetone for 0.1~10mm polyacrylonitrile-based carbon fibre at room temperature, to remove carbon
Carbon fiber is washed repeatedly and is 7 to pH and dries by fiber surface sizing agent and impurity；
Step 2：The carbon fiber 2g for weighing step 1 drying is put into round-bottomed flask and is added 100g concentrated nitric acid, in 90 DEG C
Lower reaction 2h, be cooled to room temperature after the reaction was completed by carbon fiber repeatedly deionized water and each washing of ethyl alcohol alternating 3 times to it is neutral simultaneously
Drying；
Step 3：Carbon fiber in step 2 is weighed into 0.2g, potassium permanganate 2g is separately weighed, the two is put into mortar and is ground
10min is ground, ground mixture is put into the beaker equipped with 200mL distilled water and stirs 10h, then the dense of 1mL is added dropwise
Sulfuric acid simultaneously stirs 1h, and completely reacted solution is transferred in the volumetric flask of 1000mL, is heated under conditions of 120 DEG C, instead
It is 4h between seasonable, obtains the modified carbon fiber crude product of sheet self assembly manganese dioxide, modified carbon fiber crude product is washed repeatedly
It washs to neutral and obtained by drying to modified carbon fiber；
Step 4：Modified carbon fiber, the aramid fiber that is chopped, wood-fibred are pressed to the quality of 3 ﹕, 1 ﹕ 1 using wet process pulping process
Than being dispersed in water, the fibre reinforced materials that diameter is 30mm then is made using copy paper moulding process；
Step 5：By fibre reinforced materials using phenol-formaldehyde resin modified dipping after with vulcanizer 170 DEG C at a temperature of,
Hot-press solidifying 10min obtains sheet self assembly manganese dioxide reinforced resin base frication material under the pressure of 5MPa, wherein being modified
The mass ratio of phenolic resin and modified carbon fiber is 8 ﹕ 5, obtains sheet self assembly manganese dioxide reinforced resin base frication material.
Fig. 1 is sheet self assembly manganese dioxide modified carbon fiber sample surfaces SEM photograph prepared by the present embodiment, from figure
It can be seen that there are a large amount of sheet self assembly manganese dioxide particles in fiber surface, to make carbon fiber surface area increase, surface is lived
Property improved, Fig. 2 be original carbon fiber preparation resin-matrix friction material and the modified carbon fiber of sheet self assembly manganese dioxide
The resin-matrix friction material wear rate comparison of dimension preparation, as can be seen from the figure modified fibre reinforced sample wear rate is
1.88×10-9cm3/ J is significantly reduced to the 1/9 of original carbon fiber, presents fiber and the good combination of matrix and its wear-resistant
Performance.
Embodiment 2
Step 1：Length is soaked into 36h with acetone for 0.1~10mm asphalt base carbon fiber at room temperature, to remove carbon fiber
Carbon fiber is washed repeatedly and is 7 to pH and dries by surface size agent and impurity；
Step 2：The carbon fiber 2g for weighing step 1 drying is put into round-bottomed flask and is added 100g concentrated nitric acid, in 80 DEG C
Lower reaction 4h, be cooled to room temperature after the reaction was completed by carbon fiber repeatedly deionized water and each washing of ethyl alcohol alternating 4 times to it is neutral simultaneously
Drying；
Step 3：Carbon fiber in step 2 is weighed into 0.2g, potassium permanganate 2g is separately weighed, the two is put into mortar and is ground
8min is ground, ground mixture is put into the beaker equipped with 200mL distilled water and stirs 10h, then the dense of 0.5mL is added dropwise
Sulfuric acid simultaneously stirs 1h, and completely reacted solution is transferred in the volumetric flask of 1000mL, is heated under conditions of 80 DEG C, reaction
Time is 2h, obtains the modified carbon fiber crude product of sheet self assembly manganese dioxide, modified carbon fiber crude product is washed repeatedly
To neutral and obtained by drying arrive modified carbon fiber；
Step 4：Modified carbon fiber, precipitating aramid fiber, bamboo fibre are pressed to the quality of 13 ﹕, 2 ﹕ 2 using wet process pulping process
Than being dispersed in water, the fibre reinforced materials that diameter is 30mm then is made using copy paper moulding process；
Step 5：By fibre reinforced materials using phenol-formaldehyde resin modified dipping after with vulcanizer 180 DEG C at a temperature of,
Hot-press solidifying 15min obtains sheet self assembly manganese dioxide reinforced resin base frication material under the pressure of 8MPa, wherein being modified
The mass ratio of phenolic resin and modified carbon fiber is 6 ﹕ 3, obtains sheet self assembly manganese dioxide reinforced resin base frication material
Dynamic friction coefficient is 0.12, and wear rate is 1.88 × 10-9cm3/J。
Embodiment 3
Step 1：Length is soaked into 48h with acetone for 0.1~10mm asphalt base carbon fiber at room temperature, to remove carbon fiber
Carbon fiber is washed repeatedly and is 7 to pH and dries by surface size agent and impurity；
Step 2：The carbon fiber 2g for weighing step 1 drying is put into round-bottomed flask and is added 100g concentrated nitric acid, in 90 DEG C
Lower reaction 2h, be cooled to room temperature after the reaction was completed by carbon fiber repeatedly deionized water and each washing of ethyl alcohol alternating 3 times to it is neutral simultaneously
Drying；
Step 3：Carbon fiber in step 2 is weighed into 0.2g, potassium permanganate 2g is separately weighed, the two is put into mortar and is ground
10min is ground, ground mixture is put into the beaker equipped with 200mL distilled water and stirs 10h, then the dense of 1mL is added dropwise
Sulfuric acid simultaneously stirs 1h, and completely reacted solution is transferred in the volumetric flask of 1000mL, is heated under conditions of 120 DEG C, instead
It is 6h between seasonable, obtains the modified carbon fiber crude product of sheet self assembly manganese dioxide, modified carbon fiber crude product is washed repeatedly
It washs to neutral and obtained by drying to modified carbon fiber；
Step 4：Modified carbon fiber, Fanglun slurry cake, wood-fibred are pressed to the quality score of 9 ﹕, 2 ﹕ 2 using wet process pulping process
It dissipates in water, the fibre reinforced materials that diameter is 30mm then is made using copy paper moulding process；
Step 5：By fibre reinforced materials using phenol-formaldehyde resin modified dipping after with vulcanizer 150 DEG C at a temperature of,
Hot-press solidifying 10min obtains sheet self assembly manganese dioxide reinforced resin base frication material under the pressure of 10MPa, wherein being modified
The mass ratio of phenolic resin and modified carbon fiber is 8 ﹕ 5, obtains sheet self assembly manganese dioxide reinforced resin base frication material
Dynamic friction coefficient is 0.13, and wear rate is 5.73 × 10-9cm3/J。
Embodiment 4
Step 1：Length is soaked into 42h with acetone for 0.1~10mm polyacrylonitrile-based carbon fibre at room temperature, to remove carbon
Carbon fiber is washed repeatedly and is 7 to pH and dries by fiber surface sizing agent and impurity；
Step 2：The carbon fiber 2g for weighing step 1 drying is put into round-bottomed flask and is added 100g concentrated nitric acid, in 85 DEG C
Lower reaction 3h, be cooled to room temperature after the reaction was completed by carbon fiber repeatedly deionized water and each washing of ethyl alcohol alternating 5 times to it is neutral simultaneously
Drying；
Step 3：Carbon fiber in step 2 is weighed into 0.2g, potassium permanganate 2g is separately weighed, the two is put into mortar and is ground
15min is ground, ground mixture is put into the beaker equipped with 200mL distilled water and stirs 10h, then is added dropwise 1.5mL's
The concentrated sulfuric acid simultaneously stirs 1h, and completely reacted solution is transferred in the volumetric flask of 1000mL, is heated under conditions of 160 DEG C,
Reaction time is 4h, obtains the modified carbon fiber crude product of sheet self assembly manganese dioxide, repeatedly by modified carbon fiber crude product
It washs to neutral and obtained by drying to modified carbon fiber；
Step 4：Modified carbon fiber, the aramid fiber that is chopped, bamboo fibre are pressed to the quality of 13 ﹕, 3 ﹕ 3 using wet process pulping process
Than being dispersed in water, the fibre reinforced materials that diameter is 30mm then is made using copy paper moulding process；
Step 5：By fibre reinforced materials using phenol-formaldehyde resin modified dipping after with vulcanizer 160 DEG C at a temperature of,
Hot-press solidifying 8min obtains sheet self assembly manganese dioxide reinforced resin base frication material under the pressure of 10MPa, wherein being modified
The mass ratio of phenolic resin and modified carbon fiber is 7 ﹕ 4, obtains sheet self assembly manganese dioxide reinforced resin base frication material
Dynamic friction coefficient is 0.11, and wear rate is 4.10 × 10-9cm3/J。
Claims (6)
1. a kind of preparation method of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material, feature exist
In including the following steps：
Step 1：Carbon fiber Wesy acetone soln is impregnated, after the sizing agent of carbon fiber to be removed, carbon fiber is washed into repeatedly
Property is simultaneously dried；
Step 2：By the carbon fiber of step 1 drying and concentrated nitric acid with 1：50 mass ratio is mixed to get carbon fiber mixed system,
Carbon fiber mixed system is heated to 80~90 DEG C of 2~4h of reaction, is cooled to room temperature after the reaction was completed by carbon fiber deionization
Water and ethyl alcohol, which are alternately and repeatedly washed, to be neutral to solution and dries；
Step 3：The carbon fiber and solid potassium permanganate mixed grinding for taking step 2 to obtain, and the matter of carbon fiber and potassium permanganate
Amount is than being 1:10, ground mixture is put into distilled water and stirs 10h, stirs 1h after the concentrated sulfuric acid is then added dropwise,
In, 2.2g mixture is added in every 200mL distilled water, 0.5~1.5mL concentrated sulfuric acid is added in every 200mL distilled water, then incites somebody to action
It is thick to obtain the modified carbon fiber of sheet self assembly manganese dioxide in 80~160 DEG C of at a temperature of 2~6h of heating for the mixed solution arrived
Product washs modified carbon fiber crude product repeatedly to neutral and obtained by drying to modified carbon fiber；
Step 4：Using wet process pulping process by modified carbon fiber, aramid fiber, paper fiber according to (9~13) ﹕ (2~3) ﹕ (2
~3) mass ratio is dispersed in water, and fibre reinforced materials then is made using copy paper moulding process；
Step 5：Hot-press solidifying is carried out after fibre reinforced materials is impregnated using phenol-formaldehyde resin modified obtains resin base friction material
Material.
2. a kind of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material according to claim 1
Preparation method, which is characterized in that carbon fiber Wesy acetone soln is impregnated into 36~48h in step 1.
3. a kind of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material according to claim 1
Preparation method, which is characterized in that carbon fiber and potassium permanganate are blended in 8~15min of grinding in mortar in step 3.
4. a kind of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material according to claim 1
Preparation method, which is characterized in that the mass ratio of phenol-formaldehyde resin modified and modified carbon fiber is (6~8) ﹕ (3~5) in step 5.
5. a kind of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material according to claim 1
Preparation method, which is characterized in that in step 5 hot-press solidifying temperature be 150~180 DEG C, the time be 8~15min, pressure be 5~
10MPa。
6. a kind of sheet self assembly manganese dioxide modified carbon fiber reinforced resin base frication material according to claim 1
Preparation method, which is characterized in that carbon fiber is polyacrylonitrile-based carbon fibre or asphalt base carbon fiber in step 1；In step 4
Paper fiber is wood-fibred or bamboo fibre；Aramid fiber is be chopped aramid fiber, precipitating aramid fiber or Fanglun slurry cake.
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| CN108532291A (en) * | 2018-03-30 | 2018-09-14 | 陕西科技大学 | A kind of preparation method of carbon cloth surfaces growth in situ manganese dioxide nano-plates reinforced resin base frication material |
| CN109115581B (en) * | 2018-10-30 | 2019-11-05 | 北京航空航天大学 | A kind of preparation method of the sample for high-q cavity method test fiber dielectric properties |
| CN117304648B (en) * | 2023-08-25 | 2024-06-04 | 长春盛达化工制品有限公司 | Preparation method of main insulating plate of super-hydrophobic circuit breaker |
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| CN103450501B (en) * | 2013-09-18 | 2014-11-26 | 哈尔滨工业大学 | Method for modifying surface of carbon fiber by using potassium persulfate/silver nitrate system |
| CN104195824B (en) * | 2014-09-15 | 2016-04-27 | 哈尔滨工业大学 | A kind of carbon fiber surface modification method |
| CN104328709A (en) * | 2014-09-25 | 2015-02-04 | 陕西科技大学 | Maleic anhydride modified carbon fiber reinforced wet-type friction material |
| CN104818648B (en) * | 2015-04-09 | 2017-03-15 | 陕西科技大学 | The method that a kind of modified carbon fiber of utilization manganese dioxide prepares paper friction material |
| CN105951505A (en) * | 2016-06-22 | 2016-09-21 | 陕西科技大学 | Preparation method of methacrylic acid non-destructively modified carbon fiber reinforced wet-type friction material |
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