CN112694767A - Friction material and preparation method thereof - Google Patents
Friction material and preparation method thereof Download PDFInfo
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- CN112694767A CN112694767A CN202011576209.4A CN202011576209A CN112694767A CN 112694767 A CN112694767 A CN 112694767A CN 202011576209 A CN202011576209 A CN 202011576209A CN 112694767 A CN112694767 A CN 112694767A
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- recycled waste
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- 239000002783 friction material Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 56
- 239000007822 coupling agent Substances 0.000 claims abstract description 52
- 239000000843 powder Substances 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 25
- 239000000853 adhesive Substances 0.000 claims abstract description 21
- 230000001070 adhesive effect Effects 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 21
- 229920000126 latex Polymers 0.000 claims abstract description 19
- 239000004816 latex Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 17
- KVNRLNFWIYMESJ-UHFFFAOYSA-N butyronitrile Chemical compound CCCC#N KVNRLNFWIYMESJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 10
- 230000004048 modification Effects 0.000 claims abstract description 6
- 238000012986 modification Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 78
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 12
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 12
- 238000004898 kneading Methods 0.000 claims description 12
- 239000011268 mixed slurry Substances 0.000 claims description 12
- 239000005011 phenolic resin Substances 0.000 claims description 12
- 229920001568 phenolic resin Polymers 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- -1 boron modified phenolic resin Chemical class 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 8
- 238000003801 milling Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 7
- 239000012783 reinforcing fiber Substances 0.000 claims description 7
- 229920002748 Basalt fiber Polymers 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229920000459 Nitrile rubber Polymers 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- 239000006229 carbon black Substances 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 6
- 230000003179 granulation Effects 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 6
- 238000004073 vulcanization Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 5
- 239000005060 rubber Substances 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical group C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 239000003607 modifier Substances 0.000 claims description 3
- 244000226021 Anacardium occidentale Species 0.000 claims description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 239000004593 Epoxy Substances 0.000 claims description 2
- 229920000271 Kevlar® Polymers 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 229910002113 barium titanate Inorganic materials 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 235000020226 cashew nut Nutrition 0.000 claims description 2
- 239000004519 grease Substances 0.000 claims description 2
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 2
- 239000004312 hexamethylene tetramine Substances 0.000 claims description 2
- 239000004761 kevlar Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 239000010466 nut oil Substances 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 239000011651 chromium Substances 0.000 claims 1
- 239000000047 product Substances 0.000 description 16
- 239000000428 dust Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 4
- 150000002825 nitriles Chemical class 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000000003 hoof Anatomy 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
-
- 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
- C09K3/149—Antislip compositions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/30—Polymeric waste or recycled polymer
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2409/02—Copolymers with acrylonitrile
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2409/02—Copolymers with acrylonitrile
- C08J2409/04—Latex
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2409/06—Copolymers with styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/08—Oxygen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/10—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
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- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Braking Arrangements (AREA)
Abstract
The invention relates to a friction material and a preparation method thereof. Aims to provide a friction material and a preparation method thereof; the method effectively utilizes a large amount of waste materials generated in the industry, achieves the aims of protecting the environment and protecting the health of people, ensures the product quality, and improves the production efficiency and the automation rate. The technical scheme is as follows: a friction material comprises the following components in parts by weight: 1) 5-25 parts of reinforced fiber, 10-40 parts of adhesive, 0.5-8 parts of curing auxiliary agent, 15-30 parts of surface-modified friction performance regulator and 20-60 parts of surface-modified recycled waste; the surface-modified recycled waste is obtained by modifying the surfaces of recycled waste particles by adopting a powder coupling agent; wherein the weight proportion of the powder coupling agent is 0.5-2% of the recycled waste particles; the preparation method of the surface-modified friction performance regulator comprises the following steps: firstly, a liquid coupling agent is adopted to carry out surface modification on the friction performance regulator, and then the mixture is blended with the butyronitrile latex.
Description
Technical Field
The invention relates to a friction material and a preparation method thereof.
Background
In the friction material industry, a lot of waste materials such as leftover materials or recycled dust after polishing (grinding dust for short) are generated in the production process, and most enterprises burn or bury the waste materials at present. Because the friction material belongs to a composite material, in particular to a high-molecular composite material, such as a rubber-based friction material or a resin-based friction material, leftover materials or grinding ash of the friction material can generate a large amount of harmful substances to the environment and human bodies during burning, the friction material is difficult to degrade in a short time after being buried, and partial degradation products are harmful to the environment and the human bodies. Under the condition that people have higher and higher requirements on environment and health nowadays, the better management of waste materials in the production process becomes an urgent problem to be solved.
There are two basic production processes for brake shoes in the friction material industry. One is that the dry method powder material is mixed and heated to mold and form the blank, the blank is cut, polished, coated with glue, and then is bonded with the metal hoof block coated with glue and then is cured and formed; one is to put the dry powder into a heating mould, then put the metal shoe block coated with glue on the powder, and hot press the metal shoe block into shape. The two methods both relate to the process of adding dry powder into a mold in a heating state in an open environment and carrying out reheat press molding, although the process is a mature process method in the industry, a lot of dust is generated in the production process, in a mold with multiple cavities, the dry powder belongs to a fluffy state, automatic feeding is difficult to realize, manual addition is needed in sequence, products with different curing degrees in one mold can be produced in the heating state, the conventional process cannot form full-process continuous automatic or partial automatic production, the production efficiency is seriously influenced, the process is not only harmful to the environment and the health of a human body, but also influences the product quality.
Disclosure of Invention
The invention aims to overcome the defects in the background technology and provides a friction material and a preparation method thereof; the method effectively utilizes a large amount of waste materials generated in the industry, achieves the aims of protecting the environment and protecting the health of people, ensures the product quality, and improves the production efficiency and the automation rate.
The technical scheme provided by the invention is as follows:
a friction material comprises the following components in parts by weight:
1) 5-25 parts of reinforced fiber, 10-40 parts of adhesive, 0.5-8 parts of curing auxiliary agent, 15-30 parts of surface-modified friction performance regulator and 20-60 parts of surface-modified recycled waste;
the surface-modified recycled waste is obtained by modifying the surfaces of recycled waste particles by adopting a powder coupling agent; wherein the weight proportion of the powder coupling agent is 0.5-2% of the recycled waste particles;
the preparation method of the surface-modified friction performance regulator comprises the following steps: firstly, a liquid coupling agent is adopted to carry out surface modification on the friction performance regulator, and then the mixture is blended with the butyronitrile latex.
The reinforced fiber is one or a mixture of carbon fiber, glass fiber, basalt fiber and Kevlar fiber; the reinforcing fiber is chopped fiber, and the fiber length is 3-6 mm.
The adhesive is one or a mixture of more of styrene butadiene rubber, nitrile butadiene rubber, ethylene propylene diene monomer, common phenolic resin, boron modified phenolic resin, organic silicon modified phenolic resin, epoxy modified phenolic resin, cashew nut oil modified phenolic resin, nitrile modified phenolic resin, PVB modified phenolic resin and natural grease substitute powder in any proportion.
The adhesive is a composition of rubber, phenolic resin and natural fat powder; wherein the phenolic resin is thermoplastic phenolic resin, accounts for 0-5% of the adhesive, and the ratio of the rubber to the natural fat powder is 1: 1.
The curing auxiliary agent is a vulcanization auxiliary agent or a phenolic resin curing auxiliary agent;
the vulcanizing assistant is a vulcanizing agent or a vulcanizing accelerator, and the phenolic resin curing agent is hexamethylenetetramine.
In the friction performance regulator with the surface modified, the weight proportion of the liquid coupling agent is 0.5-2% of that of the friction performance regulator, and the weight proportion of the butyronitrile latex is 5-15% of that of the friction performance regulator.
The friction performance regulator is one or a mixture of more of graphite, carbon black, barium sulfate, titanate and calcium carbonate in any proportion.
The liquid coupling agent and the powder coupling agent are one or a mixture of a plurality of silane coupling agents, phthalate coupling agents, borate coupling agents, bimetallic coupling agents, phosphate coupling agents and chromium complexes in any proportion.
The preparation method of the friction material comprises the following steps:
1) preparation of surface-modified Friction Performance modifiers
(1) Adding the liquid coupling agent, the butyronitrile latex and the friction performance regulator into a high-speed stirrer with zirconia balls according to a formula ratio, and stirring at a high speed for 30-60min to prepare mixed slurry;
(2) adding the mixed slurry into a granulator for spray granulation to prepare a surface-modified friction performance regulator;
2) preparation of surface-modified recycled waste
Adding the crushed recycled waste particles and the powder coupling agent into a mixer according to a formula ratio, and rolling and stirring for 30-60min to prepare the recycled waste with a modified surface;
3) preparation of Friction Material
(1) Weighing the reinforced fiber, the adhesive, the curing agent, the surface-modified friction performance regulator and the surface-modified recycled waste according to the formula, and then mixing;
(2) adding the material mixed in the step (1) into a kneading machine for kneading for 10-50min, and discharging uniformly mixed granules;
(3) adding the kneaded granular material in the step (2) into an open mill, milling for 30-60min, and then discharging;
(4) cutting the sheet material obtained in the step (3) into strip-shaped materials in a cutting machine;
(5) pressing the belt-shaped material obtained in the step (4) by a calender to obtain a belt-shaped material, and rolling;
(6) placing the rolled material in an oven for baking at the temperature of 130-;
(7) placing the pre-cured package material in the step (6) on an assembly device to realize the bonding and automatic continuous assembly of the friction material and the metal shoe block;
(8) after the assembly is finished, baking and curing are carried out through a baking channel, wherein the baking channel temperature is 150-;
(9) and (5) grinding the material solidified in the step (8) to finally finish product molding.
10. The method of producing a friction material according to claim 9, characterized in that: the recycled waste particles crushed in the step 2) are obtained by crushing leftover materials through a crusher, and the particle size is controlled to be less than or equal to 25 um.
The invention has the beneficial effects that:
1. one of the raw materials used in the invention is waste material generated in the friction material industry, the source is sufficient and wide, a large amount of waste material generated in the industry is solved, and the harm to the environment and human body is reduced. Although waste materials are used in the production process, the performance of the finally produced friction material can completely meet the design requirement;
2. the preparation process of the invention adopts continuous automation, greatly improves the production efficiency and saves the production cost. The material mixing process is totally closed, the discharged material is granular material, no dust can be generated during open milling, and the environment-friendly problem of dust can not be generated due to the adoption of the processes of strip opening, baking and the like for forming; and moreover, the automation rate can be improved, and the labor intensity of workers can be reduced.
3. In the preparation process, the surface of the friction performance regulator adopts butyronitrile latex and a coupling agent for modification, so that the interface compatibility of the friction performance regulator and other components in the formula is greatly improved.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
A friction material comprises the following components in parts by weight:
1) recycling waste particles: the grain diameter is 15-25um, and the weight portion is 60;
2) powder coupling agent: phthalate ester coupling agent accounting for 1.5 percent of the weight of the recycled waste particles;
3) reinforcing fibers: the fiber length is 3-6mm, the weight part of basalt fiber is 4, and the weight part of glass fiber is 3;
4) adhesive: 5 parts of styrene butadiene rubber and 13 parts of nitrile butadiene rubber;
5) friction property adjuster: 2.5 parts of graphite, 7 parts of carbon black, 3 parts of barium sulfate and 2 parts of potassium titanate whisker;
6) liquid coupling agent: a silane coupling agent accounting for 1.5% of the weight of the friction performance regulator;
7) nitrile latex: 8% of the weight of the friction performance regulator;
8) curing agent: 0.3 part of vulcanizing agent and 0.2 part of vulcanization accelerator.
The preparation method of the friction material comprises the following steps:
1) adding the liquid coupling agent, the butyronitrile latex and the friction performance regulator into a high-speed stirrer with zirconia balls according to a formula ratio, and stirring at a high speed for 50min to prepare mixed slurry;
2) adding the mixed slurry into a granulator through a diaphragm pump for spray granulation to prepare a surface-modified friction performance regulator;
3) adding the recycled waste particles and the powder coupling agent into a double-motion mixer according to a formula, and rolling and stirring for 60min to prepare recycled waste with a modified surface;
4) weighing the reinforced fiber, the adhesive, the curing agent, the surface-modified friction performance regulator and the surface-modified recycled waste according to the formula;
5) adding the mixed materials in the step 4) into a kneading machine for kneading for 40min, and discharging uniformly mixed granular materials;
6) adding the kneaded mixture obtained in the step 5) into an open mill for open milling for 50min, and discharging tablets according to the product requirements;
7) cutting the sheet material obtained in the step 6) into strip-shaped materials with certain width in a cutting machine according to requirements;
8) pressing the belt-shaped material obtained in the step 7) into a belt-shaped material through a calender with width limitation and thickness limitation according to the requirements of the thickness and the width of the product, and rolling the belt-shaped material;
9) placing the rolled material in an oven to bake for 1h, wherein the temperature of the oven is 140 ℃, and pre-curing the material is realized (the material can keep certain toughness and can be rolled on the premise of pre-curing);
10) placing the pre-cured roll material in the step 9) on continuous slicing and metal shoe block assembly equipment to realize the bonding and automatic continuous assembly of the friction material and the metal shoe block, and finally baking the roll material through a baking channel at the temperature of 160 ℃ for 40min after the assembly is finished, and finally baking and curing;
11) grinding the cured material obtained in the step 10) to finally finish product molding.
Example 2
A friction material comprises the following components in parts by weight:
1) recycling waste particles: the grain diameter is 15-25um, and the weight portion is 50;
2) powder coupling agent: phthalate ester coupling agent accounting for 1.5 percent of the weight of the recycled waste particles;
3) reinforcing fibers: the length of the fiber is 3-6mm, the weight of the basalt fiber is 7, and the weight of the glass fiber is 5;
4) adhesive: 8 parts of styrene butadiene rubber and 15 parts of nitrile butadiene rubber;
5) friction property adjuster: 2.5 parts of graphite, 7 parts of carbon black, 3 parts of barium sulfate and 2 parts of potassium titanate whisker;
6) liquid coupling agent: a silane coupling agent accounting for 1.5% of the weight of the friction performance regulator;
7) nitrile latex: 12% by weight of the friction performance modifier;
8) curing agent: 0.3 part by weight of vulcanizing agent and 0.2 part by weight of vulcanization accelerator;
a method for preparing a friction material comprising the steps of:
1) adding the liquid coupling agent, the butyronitrile latex and the friction performance regulator into a high-speed stirrer with zirconia balls according to a formula ratio, and stirring at a high speed for 50min to prepare mixed slurry;
2) adding the mixed slurry into a granulator through a diaphragm pump for spray granulation to prepare a surface-modified friction performance regulator;
3) adding the recycled waste particles and the powder coupling agent into a double-motion mixer according to a formula, and rolling and stirring for 60min to prepare recycled waste with a modified surface;
4) weighing the reinforced fiber, the adhesive, the curing system, the surface-modified friction performance regulator and the surface-modified recycled waste according to the formula;
5) adding the mixed materials in the step 4) into a kneading machine for kneading for 40min, and discharging uniformly mixed granular materials;
6) adding the kneaded mixture obtained in the step 5) into an open mill for open milling for 50min, and discharging tablets according to the product requirements;
7) cutting the sheet material obtained in the step 6) into strip-shaped materials with certain width in a cutting machine according to requirements;
8) pressing the belt-shaped material obtained in the step 7) into a belt-shaped material through a calender with width limitation and thickness limitation according to the requirements of the thickness and the width of the product, and rolling the belt-shaped material;
9) placing the rolled material in an oven to bake for 1h, wherein the temperature of the oven is 140 ℃, and pre-curing the material is realized (the material can keep certain toughness and can be rolled on the premise of pre-curing);
10) placing the pre-cured roll material in the step 9) on continuous slicing and metal shoe block assembly equipment to realize the bonding and automatic continuous assembly of the friction material and the metal shoe block, and finally baking the roll material through a baking channel at the temperature of 160 ℃ for 40min after the assembly is finished, and finally baking and curing;
11) grinding the cured material obtained in the step 10) to finally finish product molding.
Third, example 3
A friction material comprises the following components in parts by weight:
1) recycling waste particles: the grain diameter is between 15 and 25um, and the weight portion is 40;
2) powder coupling agent: phthalate ester coupling agent accounting for 1.5 percent of the weight of the recycled waste particles;
3) reinforcing fibers: the length of the fiber is 3-6mm, the weight of the basalt fiber is 14, and the weight of the glass fiber is 10;
4) adhesive: 8 parts of styrene butadiene rubber and 15 parts of nitrile butadiene rubber;
5) friction property adjuster: 2.5 parts of graphite, 7 parts of carbon black, 3 parts of barium sulfate and 2 parts of potassium titanate whisker;
6) liquid coupling agent: a silane coupling agent accounting for 1.5% of the weight of the friction performance regulator;
7) nitrile latex: 10% of the weight of the friction performance regulator;
8) curing agent: 0.3 part by weight of vulcanizing agent and 0.2 part by weight of vulcanization accelerator;
a method for preparing a friction material comprising the steps of:
1) adding the liquid coupling agent, the butyronitrile latex and the friction performance regulator into a high-speed stirrer with zirconia balls according to a formula ratio, and stirring at a high speed for 50min to prepare mixed slurry;
2) adding the mixed slurry into a granulator through a diaphragm pump for spray granulation to prepare a surface-modified friction performance regulator;
3) adding the recycled waste particles and the powder coupling agent into a double-motion mixer according to a formula, and rolling and stirring for 60min to prepare recycled waste with a modified surface;
4) weighing the reinforced fiber, the adhesive, the curing system, the surface-modified friction performance regulator and the surface-modified recycled waste according to the formula;
5) adding the mixed materials in the step 4) into a kneading machine for kneading for 40min, and discharging uniformly mixed granular materials;
6) adding the kneaded mixture obtained in the step 5) into an open mill for open milling for 50min, and discharging tablets according to the product requirements;
7) cutting the sheet material obtained in the step 6) into strip-shaped materials with certain width in a cutting machine according to requirements;
8) pressing the belt-shaped material obtained in the step 7) into a belt-shaped material through a calender with width limitation and thickness limitation according to the requirements of the thickness and the width of the product, and rolling the belt-shaped material;
9) placing the rolled material in an oven to bake for 1h, wherein the temperature of the oven is 140 ℃, and pre-curing the material is realized (the material can keep certain toughness and can be rolled on the premise of pre-curing);
10) placing the pre-cured roll material in the step 9) on continuous slicing and metal shoe block assembly equipment to realize the bonding and automatic continuous assembly of the friction material and the metal shoe block, and finally baking the roll material through a baking channel at the temperature of 160 ℃ for 40min after the assembly is finished, and finally baking and curing;
11) grinding the cured material obtained in the step 10) to finally finish product molding.
Fourth, example 4
A friction material comprises the following components in parts by weight:
1) recycling waste particles: the grain diameter is between 15 and 25um, and the weight portion is 70;
2) powder coupling agent: phthalate ester coupling agent accounting for 1.5 percent of the weight of the recycled waste particles;
3) reinforcing fibers: the length of the fiber is 3-6mm, the weight of the basalt fiber is 2, and the weight of the glass fiber is 3;
4) adhesive: 3 parts of styrene butadiene rubber and 7 parts of nitrile butadiene rubber;
5) friction property adjuster: 2.5 parts of graphite, 7 parts of carbon black, 3 parts of barium sulfate and 2 parts of potassium titanate whisker;
6) liquid coupling agent: a silane coupling agent accounting for 1.5% of the weight of the friction performance regulator;
7) nitrile latex: 8% of the weight of the friction performance regulator;
8) curing agent: 0.3 part of vulcanizing agent and 0.2 part of vulcanization accelerator.
A method for preparing a friction material comprising the steps of:
1) adding the liquid coupling agent, the butyronitrile latex and the friction performance regulator into a high-speed stirrer with zirconia balls according to a formula ratio, and stirring at a high speed for 50min to prepare mixed slurry;
2) adding the mixed slurry into a granulator through a diaphragm pump for spray granulation to prepare a surface-modified friction performance regulator;
3) adding the recycled waste particles and the powder coupling agent into a double-motion mixer according to a formula, and rolling and stirring for 60min to prepare recycled waste with a modified surface;
4) weighing the reinforced fiber, the adhesive, the curing system, the surface-modified friction performance regulator and the surface-modified recycled waste according to the formula;
5) adding the mixed materials in the step 4) into a kneading machine for kneading for 40min, and discharging uniformly mixed granular materials;
6) adding the kneaded mixture obtained in the step 5) into an open mill for open milling for 50min, and discharging tablets according to the product requirements;
7) cutting the sheet material obtained in the step 6) into strip-shaped materials with certain width in a cutting machine according to requirements;
8) pressing the belt-shaped material obtained in the step 7) into a belt-shaped material through a calender with width limitation and thickness limitation according to the requirements of the thickness and the width of the product, and rolling the belt-shaped material;
9) placing the rolled material in an oven to bake for 1h, wherein the temperature of the oven is 140 ℃, and pre-curing the material is realized (the material can keep certain toughness and can be rolled on the premise of pre-curing);
10) placing the pre-cured roll material in the step 9) on continuous slicing and metal shoe block assembly equipment to realize the bonding and automatic continuous assembly of the friction material and the metal shoe block, and finally baking the roll material through a baking channel at the temperature of 160 ℃ for 40min after the assembly is finished, and finally baking and curing;
11) grinding the cured material obtained in the step 10) to finally finish product molding.
Test results of the above examples:
as a control, the raw material contained no recycled waste.
1. Examples 1-3 compared to the control, the friction properties of the materials were not affected after a certain amount of recycled scrap was added, and the friction properties of the materials were not affected as the recycled scrap increased;
2. example 4 compared with other examples, the friction coefficient of the material of example 4 is reduced, and the abrasion is increased greatly, mainly because the recycled waste is added too much, the proportion of the adhesive is too little, and the components of the material are difficult to adhere together, so that the complete material is difficult to form, and a phenomenon that the components of the material fall off greatly occurs in the testing process;
3. the friction performance regulators in examples 1, 2 and 3 are subjected to surface modification, the addition ratio of the butyronitrile latex is respectively example 2 > example 3 > example 1, the influence is small in comparison of friction coefficients, but the abrasion of example 2 is minimum in abrasion loss, mainly because the abrasion resistance of the material is more excellent with the increase of the butyronitrile latex, but the influence of the friction coefficients is small.
The components and the parts by weight adopted in the embodiments 1 to 3 are as follows:
7-24 parts of reinforcing fiber, 18-23 parts of adhesive, 0.5 part of curing auxiliary agent, 15.88-16.46 parts of surface-modified friction performance regulator and 40-60 parts of surface-modified recycled waste;
the recovered waste material with the modified surface is prepared by the steps of (1) modifying the surface of the recovered waste material with a powder coupling agent in a weight ratio of 1.5% of the recovered waste material particles;
the friction performance regulator with the surface modified comprises 1.5% of the liquid coupling agent by weight and 12% of the butyronitrile latex by weight.
Claims (10)
1. A friction material comprises the following components in parts by weight:
1) 5-25 parts of reinforced fiber, 10-40 parts of adhesive, 0.5-8 parts of curing auxiliary agent, 15-30 parts of surface-modified friction performance regulator and 20-60 parts of surface-modified recycled waste;
the surface-modified recycled waste is obtained by performing surface modification on recycled waste particles by adopting a powder coupling agent; wherein the weight proportion of the powder coupling agent is 0.5-2% of the recycled waste particles;
the preparation method of the surface-modified friction performance regulator comprises the following steps: firstly, a liquid coupling agent is adopted to carry out surface modification on the friction performance regulator, and then the mixture is blended with the butyronitrile latex.
2. The friction material of claim 1, wherein: the reinforced fiber is one or a mixture of carbon fiber, glass fiber, basalt fiber and Kevlar fiber; the reinforcing fiber is chopped fiber, and the fiber length is 3-6 mm.
3. The friction material of claim 2, wherein: the adhesive is one or a mixture of more of styrene butadiene rubber, nitrile butadiene rubber, ethylene propylene diene monomer, common phenolic resin, boron modified phenolic resin, organic silicon modified phenolic resin, epoxy modified phenolic resin, cashew nut oil modified phenolic resin, nitrile modified phenolic resin, PVB modified phenolic resin and natural grease substitute powder in any proportion.
4. The friction material of claim 3, wherein: the adhesive is a composition of rubber, phenolic resin and natural fat powder; wherein the phenolic resin is thermoplastic phenolic resin, accounts for 0-5% of the adhesive, and the ratio of the rubber to the natural fat powder is 1: 1.
5. The friction material of claim 4, wherein: the curing auxiliary agent is a vulcanization auxiliary agent or a phenolic resin curing auxiliary agent;
the vulcanizing assistant is a vulcanizing agent or a vulcanizing accelerator, and the phenolic resin curing agent is hexamethylenetetramine.
6. The friction material of claim 5, wherein: in the friction performance regulator with the surface modified, the weight proportion of the liquid coupling agent is 0.5-2% of that of the friction performance regulator, and the weight proportion of the butyronitrile latex is 5-15% of that of the friction performance regulator.
7. The friction material of claim 6, wherein: the friction performance regulator is one or a mixture of more of graphite, carbon black, barium sulfate, titanate and calcium carbonate in any proportion.
8. The friction material of claim 7, wherein: the liquid coupling agent and the powder coupling agent are one of a silane coupling agent, a phthalate coupling agent, a borate coupling agent, a bimetallic coupling agent, a phosphate coupling agent and a chromium complex or a mixture of a plurality of the liquid coupling agent and the powder coupling agent in any proportion.
9. A method of making the friction material of claim 1, comprising the steps of:
1) preparation of surface-modified Friction Performance modifiers
(1) Adding the liquid coupling agent, the butyronitrile latex and the friction performance regulator into a high-speed stirrer with zirconia balls according to a formula ratio, and stirring at a high speed for 30-60min to prepare mixed slurry;
(2) adding the mixed slurry into a granulator for spray granulation to prepare a surface-modified friction performance regulator;
2) preparation of surface-modified recycled waste
Adding the crushed recycled waste particles and the powder coupling agent into a mixer according to a formula ratio, and rolling and stirring for 30-60min to prepare the recycled waste with a modified surface;
3) preparation of Friction Material
(1) Weighing the reinforced fiber, the adhesive, the curing agent, the surface-modified friction performance regulator and the surface-modified recycled waste according to the formula, and then mixing;
(2) adding the material mixed in the step (1) into a kneading machine for kneading for 10-50min, and discharging uniformly mixed granules;
(3) adding the kneaded granular material in the step (2) into an open mill, milling for 30-60min, and then discharging;
(4) cutting the sheet material obtained in the step (3) into strip-shaped materials in a cutting machine;
(5) pressing the belt-shaped material obtained in the step (4) by a calender to obtain a belt-shaped material, and rolling;
(6) placing the rolled material in an oven for baking at the temperature of 130-;
(7) placing the pre-cured package material in the step (6) on an assembly device to realize the bonding and automatic continuous assembly of the friction material and the metal shoe block;
(8) after the assembly is finished, baking and curing are carried out through a baking channel, wherein the baking channel temperature is 150-;
(9) and (5) grinding the material solidified in the step (8) to finally finish product molding.
10. The method of producing a friction material according to claim 9, characterized in that: the recycled waste particles crushed in the step 2) are obtained by crushing leftover materials through a crusher, and the particle size is controlled to be less than or equal to 25 um.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113201309A (en) * | 2021-04-28 | 2021-08-03 | 湖北富工摩擦材料有限公司 | Method for recycling dust of friction material |
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