KR20150138460A - Brake friction material and manufacturing method of the same - Google Patents
Brake friction material and manufacturing method of the same Download PDFInfo
- Publication number
- KR20150138460A KR20150138460A KR1020140064916A KR20140064916A KR20150138460A KR 20150138460 A KR20150138460 A KR 20150138460A KR 1020140064916 A KR1020140064916 A KR 1020140064916A KR 20140064916 A KR20140064916 A KR 20140064916A KR 20150138460 A KR20150138460 A KR 20150138460A
- Authority
- KR
- South Korea
- Prior art keywords
- liquid rubber
- friction material
- friction
- brake friction
- aramid
- Prior art date
Links
- 239000002783 friction material Substances 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000012779 reinforcing material Substances 0.000 claims abstract description 15
- 239000004760 aramid Substances 0.000 claims description 18
- 238000000465 moulding Methods 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 4
- 239000011256 inorganic filler Substances 0.000 claims description 4
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 4
- 239000002557 mineral fiber Substances 0.000 claims description 4
- 244000226021 Anacardium occidentale Species 0.000 claims description 3
- 235000020226 cashew nut Nutrition 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 239000003607 modifier Substances 0.000 claims 1
- 238000013016 damping Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 7
- 239000000047 product Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 108010010803 Gelatin Proteins 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002996 emotional effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 201000005202 lung cancer Diseases 0.000 description 1
- 208000020816 lung neoplasm Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/025—Compositions based on an organic binder
- F16D69/026—Compositions based on an organic binder containing fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0023—Shaping by pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0038—Surface treatment
- F16D2250/0046—Coating
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake friction material and a manufacturing method thereof, and more particularly, to a brake friction material and a manufacturing method thereof capable of improving noise characteristics generated during braking.
Generally, friction materials used for automobile brakes are composites containing 10 to 20 raw materials, which convert kinetic energy of a car into heat energy and release it to the atmosphere to slow down or stop the car. Such friction materials for automobile brakes can be classified into three components: a binder for combining friction materials, a reinforcing material for imparting strength and formability of the friction material, and a friction adjusting material for imparting frictional performance.
The main characteristics required for friction materials for automobile brakes include braking performance, braking noise and vibration suppression technology, and environmentally friendly technology. In recent years, due to the weight reduction and the high performance of the vehicle, not only the braking performance but also the noise and vibration suppression technology have been developed. Also, in order to protect the environment, many countries such as California, USA have legal regulations on harmful substances. In the case of aramid, it is an expensive raw material that is used as an eco-friendly material as a substitute for determining the strength of friction material and replacing it as the use of asbestos to cause lung cancer in the past is stopped.
In order to improve noise during braking, not only the friction pad lining assy, but also the vibration frequency of the disk and the vehicle chassis itself, that is, the vibration of the object There is a method of avoiding the natural frequencies generated when the vibrator vibrates.
One of the least expensive ways to improve the noise is to improve the friction material. However, when the noise characteristics of the friction material are to be improved, other characteristics such as friction coefficient and life span required for braking may be lowered. A new noise improvement method is needed to improve these side effects.
Patent Registration No. 10-0878945 (Date of Notification: 2009.01.19)
Japanese Patent Application Laid-Open No. 10-2011-0123465 (published on November 15, 2011)
SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and it is an object of the present invention to provide a brake friction material capable of reducing noise, which is an emotional characteristic generated when the vehicle is braking, and a manufacturing method thereof.
In order to accomplish the above object, the brake friction material according to the present invention is characterized in that in the brake friction material, the aramid fiber as the reinforcing material is coated with the liquid rubber.
Further, the brake friction material according to the present invention is characterized in that it comprises, as a reinforcing material, 2 to 5 wt% of aramid fibers coated with liquid rubber, 3 to 7 wt% of mineral fibers and 5 to 15 wt% of potassium titanate; 4 to 8% by weight of a thermosetting resin, 1 to 5% by weight of cashew dust, 20 to 40% by weight of an inorganic filler, and 10 to 20% by weight of a metal; 10 to 20% by weight of zirconia oxide, and 5 to 15% by weight of an inorganic lubricant.
Preferably, in the present invention, the liquid rubber is contained in an amount of 1 to 30 wt% based on the aramid fiber.
Next, a method for manufacturing a brake friction material according to the present invention comprises coating liquid rubber with aramid fibers as a reinforcing material, which is one of friction materials.
A method of manufacturing a brake friction material according to the present invention includes a first step of uniformly mixing a reinforcing material including aramid fibers coated with liquid rubber, a binder and a friction adjusting material to prepare a mixture; A second step of molding the mixture at a pressure of 200 to 400 kgf / cm < 2 >, followed by drying or preheating at 50 to 100 DEG C to prepare a preform; A third step of press-molding the preliminarily molded product at a molding temperature of 100 to 200 ° C and a molding pressure of 300 to 500 kgf / cm 2 for a time of 200 to 500 seconds to prepare a press-molded product; And a fourth step of subjecting the press-molded product to a heat treatment process at 200 to 300 ° C.
Preferably, in the present invention, the liquid rubber is sprayed on the aramid fibers in a spray manner to coat the aramid fibers.
The brake friction material and the manufacturing method according to the present invention have the effect of improving the water repellency and damping characteristics by coating the aramid fiber, which is a reinforcing material, with liquid rubber among the raw materials used in the friction material, thereby improving the noise characteristics generated during braking.
Hereinafter, embodiments of the present invention will be described in detail.
The brake friction material of the present invention is characterized in that the rubber rubber is coated on the aramid fiber contained as a reinforcing material, which is one of the friction materials, and is preferably contained in an amount of 1 to 30 wt% with respect to the aramid fiber.
The coating of the liquid rubber can be sprayed by spraying method. Specifically, the aramid fiber is sprayed in the mixing blender with the aramid. The aramid is coated with the aramid in an amount of 1 to 30 wt% based on 100 wt% of the aramid charged for about 1 to 10 minutes. Liquid rubber is sprayed by spraying.
As described above, the spray-type coating method using a spray gun can reduce the coating liquid, reduce the coating time, and accelerate the coating hardening by applying pressure to the coating liquid and injecting it using gelatin (GEL) Uniformity of thickness can be obtained.
The brake friction material according to the present invention may be composed of a mixture compounded as shown in Table 1 below.
[Table 1]
If the weight of the aramid coated with the liquid rubber is too small, it is difficult to maintain the shape in the preliminary molding, and the thermal wear characteristics may deteriorate. If too much, the aramid opening surface is not smoothly performed in the process of evenly mixing the mixture, 2 to 5 wt% is most suitable because the dispersibility is deteriorated and the friction characteristics can be changed.
If the binder is too small, the bonding between the raw materials is not performed well, and if it is too much, the product becomes hard and deteriorates the noise characteristic, so it is most preferable about 4 ~ 8 wt%.
The inorganic filler generally has the smallest effect on the friction characteristics, and can be adjusted to a range of 20 ~ 40wt% after composition of other raw materials.
Mineral fibers and potassium titanate are most stable in use at 3 ~ 7wt% and 5 ~ 15wt%, respectively, in order to ensure high temperature friction wear characteristics, especially high temperature friction coefficient stability.
The metal increases the heat capacity of the friction material and prevents the abrasion from occurring rapidly during braking at high temperatures. On the other hand, when the metal is contained in an excess amount, the abrasion characteristics may be drastically lower than when the metal is not used, and it is relatively expensive, so it is effective to use the metal in a limited amount of 10 to 20 wt%. The use of 10 to 20 wt% and 5 to 15 wt% of zirconia as the abrasive material and the lubricant, respectively, can most effectively control the braking force and lifetime, and the lubricant improves the abrasion characteristics of the friction material and the disk and the drum .
The respective steps of the method for manufacturing the brake friction material having the above structure are as follows.
In the first step, the reinforcing material including the aramid fibers coated with the liquid rubber, the binder and the friction adjusting material are uniformly mixed to prepare a mixture.
Next, in the second step, the mixture is molded at a pressure of 200 to 400 kgf / cm 2 and then dried or preheated at 50 to 100 ° C to prepare a preform.
In the third step, the preform is press-molded at a molding temperature of 100 to 200 DEG C and a molding pressure of 300 to 500 kgf / cm < 2 > for 200 to 500 seconds to prepare a press-molded article.
In the fourth step, the press-molded article is subjected to a heat treatment process at 200 to 300 ° C to produce a brake friction material final product.
The noise friction test of the product including the brake friction material of the present invention and the plain aramid fiber not coated with the liquid rubber was carried out, and the results are shown in Table 2 below.
[Table 2]
As can be seen from Table 2, it can be seen that the present invention is effective in improving the noise characteristics without improving the mixing of the other friction materials by coating the rubber of the aramid fiber used as the reinforcing material with the excellent vibration absorption rate.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.
Claims (10)
Wherein the aramid fiber is coated with a liquid rubber as a reinforcing material.
4 to 8% by weight of a thermosetting resin, 1 to 5% by weight of cashew dust, 20 to 40% by weight of an inorganic filler, and 10 to 20% by weight of a metal;
A friction material comprising 10 to 20 wt% of zirconia oxide and 5 to 15 wt% of an inorganic lubricant, as a friction modifier.
And coating the aramid fiber with the liquid rubber as a reinforcing material that is one of the friction materials.
A first step of uniformly mixing a reinforcing material, a binder and a friction modifying material including aramid fibers coated with a liquid rubber to prepare a mixture;
A second step of molding the mixture at a pressure of 200 to 400 kgf / cm < 2 >, followed by drying or preheating at 50 to 100 DEG C to prepare a preform;
A third step of press-molding the preliminarily molded product at a molding temperature of 100 to 200 ° C and a molding pressure of 300 to 500 kgf / cm 2 for a time of 200 to 500 seconds to prepare a press-molded product;
And a fourth step of subjecting the press-molded article to a heat treatment at 200 to 300 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140064916A KR20150138460A (en) | 2014-05-29 | 2014-05-29 | Brake friction material and manufacturing method of the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140064916A KR20150138460A (en) | 2014-05-29 | 2014-05-29 | Brake friction material and manufacturing method of the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20150138460A true KR20150138460A (en) | 2015-12-10 |
Family
ID=54978876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020140064916A KR20150138460A (en) | 2014-05-29 | 2014-05-29 | Brake friction material and manufacturing method of the same |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20150138460A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11002329B2 (en) | 2017-05-22 | 2021-05-11 | Lg Chem, Ltd | Resin composition for brake pad friction materials and brake pad friction materials made of the resin composition |
-
2014
- 2014-05-29 KR KR1020140064916A patent/KR20150138460A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11002329B2 (en) | 2017-05-22 | 2021-05-11 | Lg Chem, Ltd | Resin composition for brake pad friction materials and brake pad friction materials made of the resin composition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E601 | Decision to refuse application |