CN103836098A - Car brake block mixed with piemarker fiber and preparing method of car brake block - Google Patents
Car brake block mixed with piemarker fiber and preparing method of car brake block Download PDFInfo
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Abstract
The invention discloses a car brake block with a piemarker fiber and a preparing method of the car brake block. The car brake block comprises the natural piemarker fiber, aramid fiber pulp, rare-earth modified phenolic resin, a friction performance modifier, padding and the like, and comprises, by weight, 30-35 parts of reinforced fiber, 13-16 parts of binding agent, 9-12 parts of friction performance modifier and 40-45 parts of padding. The piemarker fiber on which the alkali treatment and ultrasonic treatment are carried out is low in price, light, high in specific strength, specific modulus and tensile strength and good in abrasion resistance and has other superior properties, and belongs to renewable resources. The car brake block prepared under the optimal technological condition and mixed with the piemarker fiber has a stable friction coefficient, a good brake effect and brake smoothness, is low in noise, good in comfort and friendly to the environment and is an ideal environment-friendly friction material.
Description
Technical field
The present invention relates to car brake friction material technical field, be specifically related to a kind of brake pad of car that is mixed with abutilon fibre and preparation method thereof.
Background technique
Friction material be for automobile and machinery play transmission, braking, slow down, turn to, the functional accessory of the effect such as parking.Mainly be divided into brake facing and clutch surface by the position of function and installation.In more than 20 year, there is significant change by composition and the manufacturing process of friction material in the running mechanism take automobile as representative in the past, and new-type friction material has better heat resistanceheat resistant decline performance, longer life-span and is more conducive to environmental protection and human health.Friction material belongs to crucial safety member in automotive industry, and startup, braking and the parking of automobile all be unable to do without friction material, and quality, the good and bad direct relation of friction material the people's lives and property safety.
From using cotton thread to be born as the first brake strip of reinforcing fiber, to asbestos brake strip, semimetal friction material, then to NAO friction material, high performance carbon fiber friction material.The important breakthrough each time of friction material industry is all research and development and the application that is accompanied by new material.Particularly reinforcing fiber, the property relationship of the main components such as Bond and friction material is the closest.Reinforcing fiber is friction material " skeleton ", and Main Function is to make friction material have certain intensity and toughness, makes material under the mechanisms such as impact, shearing, stretching, be unlikely to occur crackle, rupture, collapse the mechanical deteriorations such as scarce.
In addition, friction material is composite material, and its performance is affected by the factors such as the performance, content, proportioning, physical dimension of its component directly.In addition, friction material is to coordinate by polynary components such as body material, reinforcement, fillers the composite material forming.Its performance is not only subject to the impact of component material performance, is also limited by the proportioning of component simultaneously.Therefore, formula Design is the main path that improves composite property always.
In China, the nineties starts, and cellulose fiber is just applied to friction material.Natural plant fibre has the advantages such as the inexpensive and environmentally safe of light weight, makes both at home and abroad its composite material development especially to be paid close attention to, and some of them goods have started engineering application.
Piemarker is a kind of annual crudefiber crop, extensively plants in China, and bast can be made into long and tough fiber after treatment, the rope or weave simple apparatus of can making a rope by twisting the strands together, but the reasonable development of piemarker bast is applied in and still belongs to blank both at home and abroad.Abutilon fibre is except the same with other bast-fibre, the good characteristic such as have inexpensive light weight, specific strength, specific modulus is high, tensile strength is high, rub resistance is good.In addition, piemarker belongs to the native cellulose fibre of regeneration, does not produce harmful gas when thermolysis, can natural degradation, can not bear environment structure.The development of domestic automobile brake block at present also rests on the stage of focusing on braking effect and Security, does not develop into the stage of focusing on travelling comfort, the feature of environmental protection.But Hyundai Motor is just towards future developments such as high-performance, high-speed, safety and comfort, this just requires must be safe and reliable as the braking system of automobile important component part, must continually develop new braking material to meet stricter requirement, natural fibre strengthens brake block must become a development trend from now on simultaneously.
Summary of the invention
First object of the present invention be good, good, the easy break-in of pliability in a kind of working life providing for the shortcoming of domestic existing brake pad of car, brake steadily, little, the travelling comfort of noise and the good brake pad of car that is mixed with abutilon fibre of the feature of environmental protection.
It is high that second object of the present invention is to provide a kind of manufacturing efficiency, the preparation process of the brake pad of car that is mixed with abutilon fibre of constant product quality.The inner each composition performance complement of this preparation process and friction material, can give full play to the effect of each component.
Implementation method of the present invention is as follows:
For realizing first object of the present invention, the key component of brake block that is mixed with abutilon fibre is as follows: abutilon fibre, aramid fibre pulp, Lai Peinasi fiber, ceramic fiber suede, rare earth modified phenolic resin, non-ionic polyacrylamide, silane coupler, titanate coupling agent, fluorographite, flexible coke, molybdenum disulfide, scale aluminium powder, ultra-fine Cab-O-sil, titanate lamella.
For realizing second object of the present invention, the preparation process of the brake pad of car that is mixed with abutilon fibre provided by the invention, concrete technology flow process is: batching → batch mixing → cold moudling → hot-press solidifying → heat treatment → surface treatment → packing.
1. batching, batch mixing, the formula of the various components that draw according to orthogonal experiment research is prepared burden material in automatic batching system, and blending process adopts computer control, automatically realizes and feeding in raw material, metering, discharge, batch mixing;
2. cold moudling, adopts cold-press method technique, the raw material mixing is poured in mould into preliminary pre-molding on homemade preformer;
3. hot-press solidifying, by the transferred product of first one-step forming to hotpress, employing be one-shot forming technique, pressure set points is 50～60MPa, hot pressing temperature is 180～200 ℃, hot pressing time is 15～20min;
4. heat treatment, delivers to the good brake block of hot pressing in holding furnace and heat-treats, and furnace temperature remains on 220 ℃, holding time 10～15h;
5. surface treatment, the brake block after heat treatment, its surface still needs crinosity limit, adopts equipment for grinding to carry out grinding processing to brake block, and the rotating speed of equipment for grinding is 30～40r/min, makes its surfacing;
6. packing, carries out coding by the brake block processing, and after coding completes, is packaged into storehouse.
The natural reinforcing fiber that the present invention adopts is abutilon fibre.
Here be noted that; Be distributed in Jiangsu and Zhejiang Provinces, China Anhui one with automobile brake medium-sized and small enterprises, have tens, ferocious hope can fully be applied to self enterprise the tankage of miscellaneous crudefiber crop of locality, reason is; The one, national correlation department is repeated injunctions, the inaccurate poisonous lamination coating of asbestos one class that uses.Two, become the crudefiber crop tankage of the ten million ton application of urgently regenerating, application cost is extremely low.
But the character of different crudefiber crops is different, can not just bring for use, must configure no auxiliary material according to different crudefiber crops, form a kind of formula.The research topic deriving from thus, being to discard crudefiber crop is the research contents of adding the automobile brake sheet of principal fiber.Nearly ten years, lot of experiments was done to natural fibre by this seminar, had analyzed the characteristic of different fibers, and by the experiment of setting out on a journey of hundreds of thousands kilometer, had accumulated a large amount of laboratory datas, had formed thus the technical recipe of novel natural fibre enhancing brake block.
Abutilon fibre is the vegetable fiber of environmental protection, its content of cellulose 52%, and degree of lignification is higher, and lignin accounts for 16.4%.Abutilon fibre has following effect for friction material: without any toxicity, neither affect health, and also free from environmental pollution; Disperse easily, in high-speed stirred, to produce static, conglomeration unlike organic synthetic fibre or inorganic artificial fiber, the uniformity that impact mixes and the strength and stability of brake block.In addition, cellulose fiber, can not be destroyed the internal structure of friction material, and increase the porosity of brake block by directly charing at about 300 ℃, has maintained the stable of frictional behaviour.
Owing to also containing 3096 cellulose commensal in piemarker raw ramie, piemarker will pass through following treatment process before using: piemarker raw ramie → alkali treatment → washing → ultrasound processing → washing → coupling agent treatment → abutilon fibre.
1) alkali treatment: abutilon fibre is cut into length 0.5cm, is soaked in mass fraction and is in 5% NaOH solution, dipping treatment 12h under normal temperature, then be neutral with deionized water rinsing, dry to constant weight.
2) ultrasound processing: the abutilon fibre after alkali treatment is placed in ultrasonic generator, and frequency is 28kHz, and power 5kw processes piemarker 2.5kg at every turn, processing time 6h, 50～60 ℃ of temperature controlling range, then rinse and are neutral with clear water.Thereby the cellulose commensal compositions such as hemicellulose are removed, and content of cellulose improves.By for subsequent use fiber collecting after treatment ultrasound.
3) coupling agent treatment: by the alcohol solution through alkali treatment and ultrasound abutilon fibre even spraying after treatment KH-550, then dry for standby at 80 ℃.Meet the requirement as brake block fibre reinforced materials by above abutilon fibre after treatment.
The polyester fibre that the present invention selects is aramid fibre pulp.
This aramid fibre pulp is become fibrillation, is rolled into a ball cotton-shaped feather structure by the fiber process of unique technology, and its mean fiber length is 1.5～2.5mm, elongation percentage 4～6%, and specific surface area is 5.0～12.5m
2/ g.Aramid fiber adds the heat-resisting quantity that can improve material, and friction stability reduces wear extent, gives the good mechanical property of brake block, resistance to heat.In the present invention, add 3.5% aramid fibre as reinforcing material.
The inorganic reinforcing fiber adopting in invention is Lai Peinasi fiber and ceramic fiber suede.
Lai Peinasi fiber be by basalt through pulverizing, calcining fusing, centrifugal force spinning etc. process, and wherein comprise 40% non-fiber microballon and 60% fiber, the diameter 5 μ m～15 μ m of fiber, Mean length 150 μ m～650 μ m, specific surface area 0.2m
2/ g.The enhancing of Lai Peinasi fibers in composites is effective, can resistance to 1100 ℃ of high temperature, improve the thermostability of brake block.
Ceramic fiber suede main component is silica, calcium oxide and magnesium oxide, be by electric furnace of resistance type by raw material high-temperature fusion, produce and make through thread fiber-forming process of jetting/get rid of.Ceramic fiber suede has good pliability and elasticity, and little to brake disc wearing and tearing, noise is low.
The tackiness agent using in patent of the present invention is selected rare earth modified phenolic resin.
Rare earth modified phenolic resin, take rare earth chloride and nbr modified phenolic resins as raw material, adopts the method preparation of physical blending, and rare earth adding quantity is nbr modified phenolic resins 4%.Because the chemism of rare earth is high, it can form uniform network structure with phenolic resin, is conducive to the interaction of each constituent element in interface, makes whole material system in the most steady state of thermomechanics, the high temperature wear rate of friction material reduces greatly, and the heat fade of friction factor reduces.
In patent of the present invention, use surface active agent for non-ionic polyacrylamide.
Non-ionic polyacrylamide molecular chain contains amide groups or ionic group, can improve mineral fibre and organic affinity, improves the compatibility of mineral fibre and resinoid bond.
In patent of the present invention, use coupling agent for silane coupler, titanate coupling agent.
Silane coupler is coupling agent at a low price, can be well and the filler coupling such as wollastonite.
Titanate coupling agent adds in the process of batch mixing, and titanate coupling agent is sprayed on titanate lamella, improves the combination interface of itself and resin.
The frictional property regulator using in patent of the present invention is fluorographite, flexible coke, molybdenum disulfide, scale aluminium powder.
Fluorographite thermostability and chemical stability are very good, can resistance to 400 ℃～500 ℃ high temperature, and in friction material, can play anti-attrition and regulate the effects such as high temperature friction coefficient.
Flexible coke is through proper temperature roasting and with the coke powder of special process manufacturing, can in friction material, play lubricated, damping, the effect such as wear-resisting, is used in conjunction with fluorographite, and effect is better.
Antifriction when molybdenum disulfide is low temperature for friction material major function, increases and rubs when high temperature.Meanwhile, it covers the surface of friction material, can protect other materials, prevents that they are oxidized.
Scale aluminium powder adds a small amount of oiling agent with pure aluminum foil, crushes as squamous powder through pounding.For friction material, the effect that play stable friction factor, reduces wearing and tearing and dispel the heat.
In patent of the present invention, using filler is ultra-fine Cab-O-sil, titanate lamella.
Ultra-fine Cab-O-sil is a kind of In Natural Silicate calcium mineral, for friction material have that thermostability and dimensional stability are good, mechanical property and there is the advantages such as reinforcement is good.The ultra-fine Cab-O-sil particle diameter using in patent of the present invention is 2500～6000 orders, density: 2.65g/cm
3.
Titanate lamella is compared with potassium titanate crystal whisker, and its fusing point is higher, and high-temperature zone wearing and tearing are less, can guarantee the frictional behaviour in high-temperature zone; Its packing density is larger, can reduce the environmental pollution that dust from flying causes.Titanate lamella hardness is moderate, does not damage brake disc when brake; Good heat resistance can keep stable friction factor from room temperature to high temperature, has guaranteed the steady of brake; Without friction noise, " shriek " producing can avoid braking time.Titanate lamella is as the friction filler of environment protection type, at home, be widely used outward.In the present invention, the addition of titanate lamella in friction material is 16%.
Embodiment:
A kind of brake pad of car that is mixed with abutilon fibre provides for the shortcoming of domestic existing brake pad of car a kind ofly brakes steadily, noise is little, travelling comfort and the good brake pad of car of the feature of environmental protection.This brake block adopts rare earth modified phenolic resin as Bond, using abutilon fibre, aramid fibre pulp etc. as reinforcing material, and adds multiple frictional property regulator and filler, adopts hot-pressing method method to make.
Embodiment 1
The ratio of the each component in formula 1 is:
| Title | Ratio |
| Abutilon fibre | 10％ |
| Aramid fibre pulp | 3.5％ |
| Lai Peinasi fiber | 15％ |
| Ceramic fiber suede | 6％ |
| Rare earth modified phenolic resin | 16％ |
| Non-ionic polyacrylamide | 2％ |
| Silane coupler | 2％ |
| Titanate coupling agent | 2％ |
| Fluorographite | 3.5％ |
| Flexible coke | 5％ |
| Molybdenum disulfide | 1.5％ |
| Scale aluminium powder | 2.5％ |
| Ultra-fine Cab-O-sil | 15％ |
| Titanate lamella | 16％ |
Use the technological process of formula 1:
1. batching, batch mixing according to the ratio of formula 1, is prepared burden in automatic batching system, and
In stirrer, stir 5～8min, rotating speed is 400～600r/min.
2. cold pressing, the raw material mixing is poured in mould, preliminary pre-molding on preformer;
3. hot pressing, by the transferred product of first one-step forming, to hotpress, pressure set points is 50MPa, and hot pressing temperature is 180 ℃, and hot pressing time is 20min;
4. heat treatment, delivers to the good brake block of hot pressing in holding furnace and heat-treats, and furnace temperature remains on 220 ℃, holding time 10～15h;
5. surface treatment, the brake block after heat treatment, its surface still needs crinosity limit, adopts equipment for grinding to carry out grinding processing to brake block, and the rotating speed of equipment for grinding is 30～40r/min, makes its surfacing;
6. packing, carries out coding by the brake block processing, and after coding completes, is packaged into storehouse.
Embodiment 2
The ratio of the each component in formula 2 is:
| Title | Ratio |
| Abutilon fibre | 12％ |
| Aramid fibre pulp | 3.5％ |
| Lai Peinasi fiber | 15％ |
| Ceramic fiber suede | 6％ |
| Rare earth modified phenolic resin | 13％ |
| Non-ionic polyacrylamide | 2％ |
| Silane coupler | 2％ |
| Titanate coupling agent | 2％ |
| Fluorographite | 3.5％ |
| Flexible coke | 5％ |
| Molybdenum disulfide | 1.5％ |
| Scale aluminium powder | 2.5％ |
| Ultra-fine Cab-O-sil | 16％ |
| Titanate lamella | 16％ |
Use the technological process of formula 2:
1. batching, batch mixing according to the ratio of formula 2, is prepared burden, and stir 5～8min in stirrer in automatic batching system, and rotating speed is 400～600r/min.
2. cold pressing, the raw material mixing is poured in mould, preliminary pre-molding on preformer;
3. hot pressing, by the transferred product of first one-step forming, to hotpress, pressure set points is 60MPa, and hot pressing temperature is 200 ℃, and hot pressing time is 15min;
4. heat treatment, delivers to the good brake block of hot pressing in holding furnace and heat-treats, and furnace temperature remains on 220 ℃, holding time 10～15h;
5. surface treatment, adopts equipment for grinding to carry out grinding processing to brake block, and the rotating speed of equipment for grinding is 30～40r/min, makes its surfacing;
6. packing, carries out coding by the brake block processing, and after coding completes, is packaged into storehouse.
The present invention obtains optimum formula system and processing technology through orthogonal test repeatedly, the prepared brake pad of car that is mixed with abutilon fibre under optimum process condition, there is stable friction factor, comfortable skidding effect and brake smoothness, noise is little, travelling comfort is good, environmentally friendly, is desirable environment protection type friction material.
Claims (3)
1. one kind is mixed with brake pad of car of abutilon fibre and preparation method thereof, it is characterized in that: its component comprises as abutilon fibre, aramid fibre pulp, Lai Peinasi fiber, ceramic fiber suede, rare earth modified phenolic resin, non-ionic polyacrylamide, silane coupler, titanate coupling agent, fluorographite, flexible coke, molybdenum disulfide, scale aluminium powder, ultra-fine Cab-O-sil, titanate lamella; The weight fraction of described each component: 30～35 parts of reinforcing fibers, 13～16 parts, tackiness agent, 9～12 parts of frictional property regulators, 40～45 parts of fillers.
2. a kind of brake pad of car that is mixed with abutilon fibre according to claim 1, its feature is being used natural abutilon fibre as reinforcing material, after alkali treatment and ultrasound processing, isolate single fiber, after coupling agent treatment, abutilon fibre can form good bonding by phenol-formaldehyde resin modified and filler again.
3. a kind of brake pad of car that is mixed with abutilon fibre according to claim 1, its preparation process is hot pressing pressure 50～60MPa, and hot pressing temperature is 180～200 ℃, and hot pressing time is 15～20min.The brake block of producing under these process conditions has stable friction factor, and comfortable skidding effect and brake smoothness produce noise little, good braking performance and good in the time of friction work.
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| CN104946201A (en) * | 2014-03-31 | 2015-09-30 | 比亚迪股份有限公司 | Friction material, brake pad made of friction material, preparation method of brake pad, and vehicle |
| CN106015400A (en) * | 2016-06-11 | 2016-10-12 | 姜宜宽 | Hibiscus manihot fiber reinforced environment-friendly brake pad and preparation method thereof |
| CN106050990A (en) * | 2016-06-12 | 2016-10-26 | 姜宜宽 | Brake pad taking coir fibers as framework and preparation method thereof |
| CN106051002A (en) * | 2016-06-12 | 2016-10-26 | 姜宜宽 | Aupoz fibre reinforced environment friendly type brake pad and preparation method thereof |
| CN108386466A (en) * | 2018-04-25 | 2018-08-10 | 广东省材料与加工研究所 | A kind of assorted fibre enhancing ceramic-based friction material and its preparation method and application |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Jiang Yikuan Inventor before: Jiang Zhuchuan |
|
| COR | Change of bibliographic data | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160627 Address after: 266061 Hongkong East Road, Laoshan District, Shandong, China, No. 7, No. Applicant after: Qingdao University Address before: Shinan District 266071 Shandong city of Qingdao province Ningxia road 306, building 10, 102 Applicant before: Jiang Zhuchuan |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140604 |