CN107142085A - A kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre - Google Patents
A kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre Download PDFInfo
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- CN107142085A CN107142085A CN201710506690.1A CN201710506690A CN107142085A CN 107142085 A CN107142085 A CN 107142085A CN 201710506690 A CN201710506690 A CN 201710506690A CN 107142085 A CN107142085 A CN 107142085A
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- friction material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1436—Composite particles, e.g. coated particles
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Abstract
The invention discloses a kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre, polyurethane/aramid fiber composite fibre pulp is applied in non-asbestos friction material production in the present invention, cashew nut oil modified phenolic resin is added in formula, friction material toughness can be improved, reduce the hardness of product, in addition polyurethane spinning solution is added in aramid fiber spinning solution, spinning is carried out to blend spinning liquid, assign modified Fanglun slurry cake enough obdurabilities, so as to improve the toughness of friction material, stable frictional behaviour can be played to a certain extent, reach the anti-ageing purpose moved back, the reduction product degree of wear is also functioned to simultaneously, reduce the effect of noise.
Description
Technical field
The present invention relates to a kind of preparation of friction material, and in particular to a kind of the anti-ageing of non-asbestos fibre moves back friction material
The preparation method of material.
Background technology
With developing rapidly for auto industry, the security and comfortableness travelled to vehicle requires more and more higher.Friction material
Material is one of vehicle key accessory, has very big influence to the security and comfortableness of vehicle.Current friction both domestic and external
The material overwhelming majority all uses resin rubber piece friction material, under the working environment of HTHP, the resinous wood of friction material
Material, which can decompose, causes the significantly decline of coefficient of friction, causes the heat fading of material, directly affects insensitivity and row
Car safety.
Aramid fiber is a kind of new tec fiber, with very high intensity and modulus, excellent high temperature resistant and resistance to acids and bases,
And the premium properties such as light weight, its intensity is 5-6 times of steel wire, and modulus is 2-3 times of steel wire or glass fibre, and toughness is steel
2 times of silk, and density is only 1/5 of steel wire or so, at a temperature of 500 DEG C, is not decomposed, and is not melted.
But in aramid fiber strand, amide group is located between 2 phenyl ring, and big pi bond conjugated structure is formed with phenyl ring,
Inward turning steric hindrance is high, and aramid fiber surface is smooth, and chemism is low, and the adsorption capacity to resin, elastomeric material is poor, therefore its
It is not strong with resin and the interfacial adhesion of other fibers in friction material formulation, rubbed under the hot conditions that friction catch is produced
Organic component in wiping material easily occurs thermal decomposition and come off from host material, produces heat fading phenomenon.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of anti-ageing preparation for moving back friction material of non-asbestos fibre
Method, reduces the character of heat-fading and wear rate of friction material.
The present invention is achieved by the following technical solutions：
A kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre, its preparation technology comprises the following steps：
（1）The processing of the LiCl aqueous solution：
The LiCl aqueous solution that mass fraction is 20wt% is prepared, 60-75 parts by weight aramid fiber/polyurethane nano chopped fiber is put into molten
In liquid, the heating response in water-bath, it is 78-83 DEG C to control temperature, and reaction is taken out after 4-6 hours, uses distilled water flushing 4-7
It is secondary, it is transferred in surface plate, is put into air dry oven the dry for standby at 95-100 DEG C；
（2）By the aramid fiber after above-mentioned processing/polyurethane nano chopped fiber after washing, it is 2-3%'s to be configured to stock quality concentration
Fibrous suspension, is beaten using trough-style pulp beater through two-section joint pulping process, and modified virtue is obtained after suction filtration, washing, drying
Synthetic fibre pulp；
（3）20-30 parts of cashew nut oil-phenolic resins, 8-14 parts of bentonites, 10-18 parts of aluminum oxide and above-mentioned modifying aramid fiber pulp are pressed
Order is added portionwise in high speed mixer, and batch mixing of starting shooting, mixing time is 15-30 minutes, after material is well mixed, and discharging is obtained
To compound；
（4）It is preforming：
Above-mentioned compound is weighed by the inventory of compressed tablets requirement, in input preforming mould, in 40-70MPa unit pressures
It is preforming at room temperature that cold base is made in the presence of power；
（5）It is then placed in 155-170 DEG C of die cavity, progress is hot-forming, and briquetting pressure is 15-20MPa, and hot pressing time is
Hot-forming product, is finally put into heat treatment oven by 10min, under 175-185 DEG C of temperature conditionss, and heat treatment 5-7 is small
When, produce.
Wherein, described aramid fiber/polyurethane nano chopped fiber is using the poly- ammonia that aramid fiber spinning solution and mass fraction are 20%
Ester spinning solution is mixed, and obtains uniform blend spinning liquid, carries out spinning, is wound, and it is the short of 4-8mm to be cut into length into cutting machine
Fiber.
Wherein, described aramid fiber spinning solution is through the following steps that be prepared from：Under nitrogen protection, add into reactor
Enter 160-210 parts by weight DMA, 6-11 parts of anhydrous calcium chlorides, rise temperature is to 55-64 DEG C, and calcium to be chlorinated is complete
After fully dissolved, room temperature is cooled to, is added after 24-38 parts of p-phenylenediamine, 21-32 parts 3,4 '-diaminodiphenyl ether, stirring and dissolving,
Solution is cooled to -10 DEG C to -5 DEG C, 6-11 parts of paraphthaloyl chlorides is then added and is stirred vigorously, after rod climbing phenomenon to appear,
76-83 DEG C is warming up to, continues stirring reaction 20-30 minutes, calcium hydroxide is added and neutralizes, obtain polymer dope, use appropriate N,
N- dimethylacetamide solvents dilute, and are configured to the aramid fiber spinning solution that mass fraction is 10-15%.
Wherein, spinning process condition is：Set voltage 26KV, spinning apart from 15cm, fltting speed 0.0001mm/s, receive
Device rotating speed 50r/min, 40-50 DEG C of spinning temperature, humidity 40%RH, 1.5 hours spinning time.
Wherein, first paragraph beating pressure is 10-20kg in described joint pulping process, and second segment beating pressure is 2-
6kg。
Wherein, first paragraph beating time is 30-50 minutes in described joint pulping process, and second segment beating time is
15-20 hours.
Compared with prior art, the present invention has advantages below：
（1）Spinning fibre is pre-processed using the LiCl aqueous solution in the present invention, LiCl can with aramid fiber strand
Carbonyl is complexed, and the hydrogen bond of aramid fiber molecule interchain is destroyed, so that the regularity of aramid fiber strand is destroyed, to aramid fiber
Fiber surface is performed etching, and makes aramid fiber surface formation groove, surface roughness increase, the modification obtained after being handled through mashing
The specific surface area increase of Fanglun slurry cake, improves the adsorption capacity to resin, elastomeric material.
（2）Polyurethane spinning solution is added in aramid fiber spinning solution in the present invention, spinning is carried out to blend spinning liquid, because
Polyurethane has higher elasticity, intensity, so as to assign modified Fanglun slurry cake enough obdurabilities, uses it as enhancing
Automobile brake lining plate prepared by material has excellent braking ability, braking stationarity enhancing, brakeless low frequency noise.
（3）Polyurethane/aramid fiber composite fibre pulp is applied in non-asbestos friction material production in the present invention, in formula
It is middle to add cashew nut oil modified phenolic resin, friction material toughness can be improved, the hardness of product is reduced, this is mainly due to cashew nut
There is longer meta straight chain in oil molecule, internal plasticization is played to phenolic resin, so that the toughness of friction material is improved, one
Determine that stable frictional behaviour can be played in degree, reach the anti-ageing purpose moved back, while also functioning to the reduction product degree of wear, reducing and make an uproar
The effect of sound.
Embodiment
A kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre, its preparation technology comprises the following steps：
（1）The processing of the LiCl aqueous solution：
The LiCl aqueous solution that mass fraction is 20wt% is prepared, 75 parts by weight aramid fibers/polyurethane nano chopped fiber is put into solution
In, the heating response in water-bath, it is 80 DEG C to control temperature, and reaction is taken out after 6 hours, with distilled water flushing 7 times, is transferred to table
In the ware of face, the dry for standby at 100 DEG C is put into air dry oven；
（2）By the aramid fiber after above-mentioned processing/polyurethane nano chopped fiber after washing, it is 2.5% to be configured to stock quality concentration
Fibrous suspension, is beaten using trough-style pulp beater through two-section joint pulping process, and modified virtue is obtained after suction filtration, washing, drying
Synthetic fibre pulp；
（3）By 30 parts of cashew nut oil-phenolic resins, 12 parts of bentonites, 13 parts of aluminum oxide and above-mentioned modifying aramid fiber pulp in order in batches
Add in high speed mixer, batch mixing of starting shooting, mixing time is 30 minutes, after material is well mixed, discharging obtains compound；
（4）It is preforming：
Above-mentioned compound is weighed by the inventory of compressed tablets requirement, in input preforming mould, in 70MPa unit pressures
It is preforming at room temperature that cold base is made under effect；
（5）In the die cavity for being then placed in 160 DEG C, progress is hot-forming, and briquetting pressure is 20MPa, and hot pressing time is 10min, most
Hot-forming product is put into heat treatment oven afterwards, under 180 DEG C of temperature conditionss, is heat-treated 7 hours, produces.
Wherein, described aramid fiber/polyurethane nano chopped fiber is using the poly- ammonia that aramid fiber spinning solution and mass fraction are 20%
Ester spinning solution is mixed, and obtains uniform blend spinning liquid, carries out spinning, is wound, and it is the short of 4-8mm to be cut into length into cutting machine
Fiber.
Wherein, described aramid fiber spinning solution is through the following steps that be prepared from：Under nitrogen protection, add into reactor
Enter 210 parts by weight DMAs, 9 parts of anhydrous calcium chlorides, rise temperature is to 60 DEG C, after calcium to be chlorinated is completely dissolved,
Be cooled to room temperature, add 31 parts of p-phenylenediamine, 32 part 3, solution after stirring and dissolving, is cooled to -10 by 4 '-diaminodiphenyl ether
DEG C to -5 DEG C, then add 11 parts of paraphthaloyl chlorides and be stirred vigorously, after rod climbing phenomenon to appear, be warming up to 80 DEG C, persistently stir
Reaction 30 minutes is mixed, calcium hydroxide is added and neutralizes, obtain polymer dope, diluted with appropriate DMA solvent,
It is configured to the aramid fiber spinning solution that mass fraction is 15%.
Wherein, spinning process condition is：Set voltage 26KV, spinning apart from 15cm, fltting speed 0.0001mm/s, receive
Device rotating speed 50r/min, 45 DEG C of spinning temperature, humidity 40%RH, 1.5 hours spinning time.
Wherein, first paragraph beating pressure is 20kg in described joint pulping process, and second segment beating pressure is 6kg.
Wherein, first paragraph beating time is 50 minutes in described joint pulping process, and second segment beating time is 20 small
When.
Claims (6)
1. the anti-ageing preparation method for moving back friction material of a kind of non-asbestos fibre, it is characterised in that its preparation technology includes
Following steps：
（1）The processing of the LiCl aqueous solution：
The LiCl aqueous solution that mass fraction is 20wt% is prepared, 60-75 parts by weight aramid fiber/polyurethane nano chopped fiber is put into molten
In liquid, the heating response in water-bath, it is 78-83 DEG C to control temperature, and reaction is taken out after 4-6 hours, uses distilled water flushing 4-7
It is secondary, it is transferred in surface plate, is put into air dry oven the dry for standby at 95-100 DEG C；
（2）By the aramid fiber after above-mentioned processing/polyurethane nano chopped fiber after washing, it is 2-3%'s to be configured to stock quality concentration
Fibrous suspension, is beaten using trough-style pulp beater through two-section joint pulping process, and modified virtue is obtained after suction filtration, washing, drying
Synthetic fibre pulp；
（3）20-30 parts of cashew nut oil-phenolic resins, 8-14 parts of bentonites, 10-18 parts of aluminum oxide and above-mentioned modifying aramid fiber pulp are pressed
Order is added portionwise in high speed mixer, and batch mixing of starting shooting, mixing time is 15-30 minutes, after material is well mixed, and discharging is obtained
To compound；
（4）It is preforming：
Above-mentioned compound is weighed by the inventory of compressed tablets requirement, in input preforming mould, in 40-70MPa unit pressures
It is preforming at room temperature that cold base is made in the presence of power；
（5）It is then placed in 155-170 DEG C of die cavity, progress is hot-forming, and briquetting pressure is 15-20MPa, and hot pressing time is
Hot-forming product, is finally put into heat treatment oven by 10min, under 175-185 DEG C of temperature conditionss, and heat treatment 5-7 is small
When, produce.
2. a kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre according to claims 1, it is special
Levy and be, described aramid fiber/polyurethane nano chopped fiber is using the polyurethane spinning that aramid fiber spinning solution and mass fraction are 20%
Liquid is mixed, and obtains uniform blend spinning liquid, carries out spinning, and winding is cut into the chopped fiber that length is 4-8mm into cutting machine.
3. a kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre according to claims 1,2, its
It is characterised by, described aramid fiber spinning solution is through the following steps that be prepared from：Under nitrogen protection, added into reactor
160-210 parts by weight DMA, 6-11 parts of anhydrous calcium chlorides, rise temperature is to 55-64 DEG C, and calcium to be chlorinated is complete
After dissolving, room temperature is cooled to, is added after 24-38 parts of p-phenylenediamine, 21-32 parts 3,4 '-diaminodiphenyl ether, stirring and dissolving, will
Solution is cooled to -10 DEG C to -5 DEG C, then adds 6-11 parts of paraphthaloyl chlorides and is stirred vigorously, and after rod climbing phenomenon to appear, rises
Temperature continues stirring reaction 20-30 minutes to 76-83 DEG C, adds calcium hydroxide and neutralizes, obtains polymer dope, use appropriate N, N-
Dimethylacetamide solvent dilutes, and is configured to the aramid fiber spinning solution that mass fraction is 10-15%.
4. a kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre according to claims 1,2, its
It is characterised by, spinning process condition is：Voltage 26KV, spinning is set to turn apart from 15cm, fltting speed 0.0001mm/s, receiver
Fast 50r/min, 40-50 DEG C of spinning temperature, humidity 40%RH, 1.5 hours spinning time.
5. a kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre according to claims 1, it is special
Levy and be, first paragraph beating pressure is 10-20kg in described joint pulping process, second segment beating pressure is 2-6kg.
6. a kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre according to claims 1,5, its
It is characterised by, first paragraph beating time is 30-50 minutes in described joint pulping process, second segment beating time is 15-20
Hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710506690.1A CN107142085A (en) | 2017-06-28 | 2017-06-28 | A kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710506690.1A CN107142085A (en) | 2017-06-28 | 2017-06-28 | A kind of anti-ageing preparation method for moving back friction material of non-asbestos fibre |
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| CN104479128A (en) * | 2014-12-17 | 2015-04-01 | 清华大学 | Method for preparing p-aramid fiber by condensation polymerization of p-phenylenediamine and paraphthaloyl chloride through emulsion process |
| CN106592008A (en) * | 2016-12-14 | 2017-04-26 | 烟台泰和新材料股份有限公司 | Heat-resistant spandex fiber and preparation method thereof |
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2017
- 2017-06-28 CN CN201710506690.1A patent/CN107142085A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1814657A (en) * | 2005-02-02 | 2006-08-09 | 中南大学 | Environment-protection type high-performance automobile braking piece and making method |
| CN101456950A (en) * | 2008-10-28 | 2009-06-17 | 烟台氨纶股份有限公司 | Preparation method and product of high molecular weight poly (p-phenylene terephthalamide) |
| CN102094353A (en) * | 2009-12-14 | 2011-06-15 | 盐城市兰邦工业纤维有限公司 | Para-aramid-acrylic compound pulp |
| CN101928395A (en) * | 2010-08-16 | 2010-12-29 | 深圳市中晟创新科技股份有限公司 | Preparation method of polyphenylene terephthalamide resin |
| CN102002883A (en) * | 2010-09-20 | 2011-04-06 | 华南理工大学 | Wet type paper-based friction material as well as preparation method and application thereof |
| CN103088627A (en) * | 2013-02-07 | 2013-05-08 | 贵州大学 | Treatment method for surface of aramid fiber |
| CN104033518A (en) * | 2014-05-24 | 2014-09-10 | 衡水昕龙制动绝缘材料有限公司 | Preparation method of explosion-proof brake pad |
| CN104479128A (en) * | 2014-12-17 | 2015-04-01 | 清华大学 | Method for preparing p-aramid fiber by condensation polymerization of p-phenylenediamine and paraphthaloyl chloride through emulsion process |
| CN106750265A (en) * | 2016-11-18 | 2017-05-31 | 清华大学 | A kind of the continuous of p-aramid fiber nanofiber dispersion liquid is prepared on a large scale method |
| CN106592008A (en) * | 2016-12-14 | 2017-04-26 | 烟台泰和新材料股份有限公司 | Heat-resistant spandex fiber and preparation method thereof |
Non-Patent Citations (1)
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Application publication date: 20170908 |