CN114479133A - Application and preparation method of powder styrene butadiene rubber friction material - Google Patents
Application and preparation method of powder styrene butadiene rubber friction material Download PDFInfo
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- CN114479133A CN114479133A CN202210215001.2A CN202210215001A CN114479133A CN 114479133 A CN114479133 A CN 114479133A CN 202210215001 A CN202210215001 A CN 202210215001A CN 114479133 A CN114479133 A CN 114479133A
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- 229920003048 styrene butadiene rubber Polymers 0.000 title claims abstract description 110
- 239000000843 powder Substances 0.000 title claims abstract description 68
- 239000002783 friction material Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000002174 Styrene-butadiene Substances 0.000 claims abstract description 59
- 238000003756 stirring Methods 0.000 claims abstract description 35
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 34
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000004816 latex Substances 0.000 claims abstract description 28
- 229920000126 latex Polymers 0.000 claims abstract description 28
- 239000011115 styrene butadiene Substances 0.000 claims abstract description 28
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 21
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 239000008394 flocculating agent Substances 0.000 claims abstract description 13
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000007800 oxidant agent Substances 0.000 claims abstract description 11
- 230000001590 oxidative effect Effects 0.000 claims abstract description 11
- 239000003607 modifier Substances 0.000 claims abstract description 9
- 238000000975 co-precipitation Methods 0.000 claims abstract description 7
- 238000005345 coagulation Methods 0.000 claims abstract description 7
- 230000015271 coagulation Effects 0.000 claims abstract description 7
- 238000004132 cross linking Methods 0.000 claims abstract description 6
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 15
- 239000001110 calcium chloride Substances 0.000 claims description 15
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 150000001451 organic peroxides Chemical class 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- 238000007873 sieving Methods 0.000 claims description 7
- 238000007334 copolymerization reaction Methods 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 150000003254 radicals Chemical class 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000008399 tap water Substances 0.000 claims description 5
- 235000020679 tap water Nutrition 0.000 claims description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 5
- 229920002554 vinyl polymer Polymers 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 235000021355 Stearic acid Nutrition 0.000 claims description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 4
- 239000002952 polymeric resin Substances 0.000 claims description 4
- 239000008117 stearic acid Substances 0.000 claims description 4
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 claims description 4
- SPTHWAJJMLCAQF-UHFFFAOYSA-N 1,2-di(propan-2-yl)benzene;hydrogen peroxide Chemical compound OO.CC(C)C1=CC=CC=C1C(C)C SPTHWAJJMLCAQF-UHFFFAOYSA-N 0.000 claims 1
- 229920001971 elastomer Polymers 0.000 abstract description 13
- 239000005060 rubber Substances 0.000 abstract description 13
- 239000006185 dispersion Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 239000010954 inorganic particle Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 101150033167 PSBR gene Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- SPTHWAJJMLCAQF-UHFFFAOYSA-M ctk4f8481 Chemical compound [O-]O.CC(C)C1=CC=CC=C1C(C)C SPTHWAJJMLCAQF-UHFFFAOYSA-M 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000013101 initial test Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/16—Powdering or granulating by coagulating dispersions
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/126—Polymer particles coated by polymer, e.g. core shell structures
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
- C08J3/21—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase
- C08J3/215—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase at least one additive being also premixed with a liquid phase
-
- 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
-
- 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
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/06—Copolymers with styrene
-
- 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
- C08J2457/00—Characterised by the use of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
-
- 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
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0056—Elastomers
-
- 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
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
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- Chemical & Material Sciences (AREA)
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
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Abstract
The invention discloses an application and preparation method of a powdered styrene-butadiene rubber friction material, which comprises the steps of sequentially adding water and styrene-butadiene latex into a polymerization kettle, stirring and heating, adding an oxidant for crosslinking reaction to obtain surface crosslinked styrene-butadiene latex, dispersing kaolin into ammonia water, adding a surface modifier, heating in a water bath during stirring, adding the crosslinked styrene-butadiene latex into a stirring product, premixing in a high-speed stirrer, adding a coating agent after uniformly mixing to form a powdered system, placing in a common stirrer for constant-temperature stirring, adding a flocculating agent, strongly stirring in the high-speed stirrer, and carrying out powdered coagulation coprecipitation in the powdered system. The application and the preparation method of the powder butadiene styrene rubber friction material have the advantages that the powder rubber obtains ideal dispersion in the friction material, is not easy to generate partial damage phenomenon when bearing high-speed friction, is easy to be powdered, has high powder forming rate and better mechanical property, obviously reduces long-time deformation and improves the tensile strength.
Description
Technical Field
The invention relates to the technical field of rubber materials, in particular to an application and a preparation method of a powder styrene-butadiene rubber friction material.
Background
Styrene butadiene rubber is a short for styrene-butadiene rubber, is a high molecular elastomer material synthesized by copolymerization reaction of butadiene and styrene serving as main monomers, has a molecular weight of 20-30 ten thousand, and is a long-chain linear structure. The styrene with the annular structure is a hard segment and plays a role in resisting flow; the PSBR powdered styrene-butadiene rubber is a brand new styrene-butadiene rubber which is researched and developed based on that the blocky styrene-butadiene rubber cannot be applied or is very inconvenient to apply in some fields.
The mixing process is that the raw materials of powder rubber, resin, fiber and filler are mixed directly in a mixer to produce the plastic. Is also the method mainly used by friction material manufacturers at home and abroad at present. In the direct mixing process, the powdered rubber component cannot be well dispersed in the friction material product, so that the powder forming rate of the styrene butadiene rubber is low, the tensile strength is poor, and the friction material is easy to be partially damaged when bearing high-speed friction.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the application and the preparation method of the powder styrene butadiene rubber friction material, which have the advantages of high powder yield, good tensile strength and the like, and solve the problem that part of the friction material is easy to damage when bearing high-speed friction.
(II) technical scheme
The invention aims to solve another technical problem of providing an application and a preparation method of a powder styrene butadiene rubber friction material, which comprises the following raw materials: styrene butadiene latex (SBR), kaolin (MO), high molecular resin, calcium chloride aqueous solution and ammonia water (NH)4OH）；
S1: sequentially adding water and styrene butadiene latex (SBR) into a polymerization kettle, stirring and heating, and adding an oxidant for crosslinking reaction to obtain the surface crosslinked styrene butadiene latex.
S2: mixing Kaolin (MO)1) Dispersed in ammonia water (NH)4OH), adding a surface modifier, heating in water bath to 80-85 ℃ in the stirring process, stirring at constant temperature, and reacting for the time of1h。
S3: adding cross-linked styrene-butadiene latex into the stirring product in the S2, premixing in a high-speed stirrer, adding a coating agent after uniformly mixing to form a powder system, placing in a common stirrer again, stirring at constant temperature for 1h, adding a flocculating agent, strongly stirring in the high-speed stirrer again, and performing powder coagulation and coprecipitation on the powder system.
S4: filtering to remove water, washing with tap water for 3-4 times, dewatering in a dryer, sieving, and drying in an oven to constant weight to obtain SBR/MO powder styrene butadiene rubber.
Preferably, the styrene-butadiene latex (SBR) has a solid content of 21%, and the kaolin (MO) has a particle size of MO1The polymer resin is a free radical copolymerization product of vinyl monomer, the concentration of the calcium chloride aqueous solution is 5 percent, and the ammonia water (NH)4OH) in a concentration of 25% to 27%.
Preferably, the kaolin (MO)1) As a reaction filler, the polymer resin is used as a coating agent, and the calcium chloride aqueous solution is used as a flocculating agent.
Preferably, the oxidant in S1 is an organic peroxide, the organic peroxide is one of cumene hydroperoxide, tert-butyl hydroperoxide or diisopropylbenzene hydroperoxide, the surface modifier in S2 is stearic acid, and the drying temperature in S4 is 80-95 ℃.
The invention aims to solve the other technical problem of providing the application of the powdered styrene-butadiene rubber friction material, wherein the SBR/MO powdered styrene-butadiene rubber is mainly applied to industrial manufacturing, and particularly can be applied to manufacturing a disc brake pad and a drum brake pad.
(III) advantageous effects
Compared with the prior art, the invention provides the application and the preparation method of the powder styrene butadiene rubber friction material, and the powder styrene butadiene rubber friction material has the following beneficial effects:
1. the application and preparation method of the powder styrene-butadiene rubber friction material comprises the steps of premixing the powder styrene-butadiene rubber in a high-speed stirrer during the preparation of the powder styrene-butadiene rubber, adding a coating agent after uniform mixing to form a powder system, placing the powder system in a common stirrer again for constant-temperature stirring, adding a flocculating agent, performing intensive stirring again in the high-speed stirrer, performing powder coagulation and coprecipitation on the powder system, and uniformly mixing rubber powder and an inorganic filler by means of high-speed shearing force and collision of inorganic particles and elastic rubber particles, so that ideal dispersion of the powder rubber in the friction material can be ensured, and partial breakage phenomenon is not easy to occur when the powder styrene-butadiene rubber is subjected to high-speed friction.
2. The application and preparation method of the powder butadiene styrene rubber friction material have the advantages that kaolin is added during the preparation of the powder rubber, and the powder rubber has an isolation effect on butadiene styrene rubber particles, so that the system is easy to be powdered, the powder forming rate is high, and the surface modified MO1The prepared SBR/MO powder styrene butadiene rubber has better mechanical property, obviously reduces long-term deformation and improves tensile strength.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a preparation method of a powder styrene-butadiene rubber friction material comprises the following raw materials: styrene butadiene latex (SBR), kaolin (MO), high molecular resin, calcium chloride aqueous solution and ammonia water (NH)4OH), styrene butadiene latex (SBR) with a solid content of 21%, kaolin (MO) with a particle size of MO1The high-molecular resin is prepared from the free radical copolymerization product of vinyl monomer, calcium chloride aqueous solution (5%), and ammonia (NH)4OH) concentration of 25%, Kaolin (MO)1) As a reaction filler, high molecular resin is used as a coating agent, and calcium chloride aqueous solution is used as a flocculating agent.
The preparation method of the powder styrene-butadiene rubber friction material comprises the following steps:
s1: sequentially adding water and styrene butadiene latex (SBR) into a polymerization kettle, stirring and heating, adding an oxidant, and performing crosslinking reaction to obtain the surface crosslinked styrene butadiene latex, wherein the oxidant is organic peroxide, and the organic peroxide is cumene hydroperoxide.
S2: mixing Kaolin (MO)1) Dispersed in ammonia water (NH)4OH), adding a surface modifier, heating in a water bath to 85 ℃ in the stirring process, stirring at constant temperature, and reacting for 1h, wherein the surface modifier is stearic acid.
S3: adding cross-linked styrene-butadiene latex into the stirring product in the S2, premixing in a high-speed stirrer, adding a coating agent after uniformly mixing to form a powder system, placing in a common stirrer again, stirring at constant temperature for 1h, adding a flocculating agent, strongly stirring in the high-speed stirrer again, and performing powder coagulation and coprecipitation on the powder system.
S4: filtering to remove water, washing with tap water for 3 times, dewatering in a dryer, sieving, and drying in an oven to constant weight at 95 deg.C to obtain SBR/MO powder styrene butadiene rubber.
SBR/MO powdered styrene-butadiene rubber is applied to industrial manufacturing, in particular to manufacturing a disc brake block and a drum brake block.
Comparative example one:
a preparation method of a powder styrene-butadiene rubber friction material comprises the following raw materials: styrene butadiene latex (SBR), kaolin (MO), high molecular resin, calcium chloride aqueous solution and ammonia water (NH)4OH), styrene butadiene latex (SBR) with a solid content of 21%, kaolin (MO) with a particle size of MO1The high-molecular resin is prepared from the free radical copolymerization product of vinyl monomer, calcium chloride aqueous solution (5%), and ammonia (NH)4OH) concentration of 25%, Kaolin (MO)1) As a reaction filler, high molecular resin is used as a coating agent, and calcium chloride aqueous solution is used as a flocculating agent.
The preparation method of the powder styrene-butadiene rubber friction material comprises the following steps:
s1: sequentially adding water and styrene butadiene latex (SBR) into a polymerization kettle, stirring and heating, adding an oxidant, and performing crosslinking reaction to obtain the surface crosslinked styrene butadiene latex, wherein the oxidant is organic peroxide, and the organic peroxide is cumene hydroperoxide.
S2: mixing Kaolin (MO)1) Dispersed in ammonia water (NH)4OH), adding a surface modifier, heating in a water bath to 85 ℃ in the stirring process, stirring at constant temperature, and reacting for 1h, wherein the surface modifier is stearic acid.
S3: adding cross-linked styrene-butadiene latex into the stirring product in the S2, uniformly mixing, adding a coating agent to form a powder system, placing the powder system in a common stirrer again, stirring for 1 hour at constant temperature, adding a flocculating agent, and performing powder coagulation coprecipitation on the powder system.
S4: filtering to remove water, washing with tap water for 3 times, dewatering in a dryer, sieving, and drying in an oven to constant weight at 95 deg.C to obtain SBR/MO powder styrene butadiene rubber.
SBR/MO powdered styrene-butadiene rubber is applied to industrial manufacturing, in particular to manufacturing a disc brake block and a drum brake block.
Comparative example two:
a preparation method of a powder styrene-butadiene rubber friction material comprises the following raw materials: styrene butadiene latex (SBR), high molecular resin, calcium chloride aqueous solution, the solid content of styrene butadiene latex (SBR) is 21%, the high molecular resin is the free radical copolymerization product of vinyl monomer, the concentration of calcium chloride aqueous solution is 5%, ammonia water (NH)4OH) concentration of 25%, Kaolin (MO)1) As a reaction filler, high molecular resin is used as a coating agent, and calcium chloride aqueous solution is used as a flocculating agent.
The preparation method of the powder styrene-butadiene rubber friction material comprises the following steps:
s1: sequentially adding water and styrene butadiene latex (SBR) into a polymerization kettle, stirring and heating, adding an oxidant, and performing crosslinking reaction to obtain the surface crosslinked styrene butadiene latex, wherein the oxidant is organic peroxide, and the organic peroxide is cumene hydroperoxide.
S2: adding cross-linked styrene-butadiene latex into the stirring product in the S1, premixing in a high-speed stirrer, adding a coating agent after uniformly mixing to form a powder system, placing in a common stirrer again, stirring at constant temperature for 1h, adding a flocculating agent, strongly stirring in the high-speed stirrer again, and performing powder coagulation and coprecipitation on the powder system.
S3: filtering to remove water, washing with tap water for 3 times, dewatering in a dryer, sieving, and drying in an oven to constant weight at 95 deg.C to obtain SBR/MO powder styrene butadiene rubber.
SBR/MO powdered styrene-butadiene rubber is applied to industrial manufacturing, in particular to manufacturing a disc brake block and a drum brake block.
The surface hardness of the disc brake pad and the drum brake pad prepared in the first example and the first comparative example are respectively tested, a diamond conical pressure head is pressed into the surface of a sample in two steps, after the specified holding time, the main test force is removed, the residual indentation depth h under the initial test force is measured, the Rockwell hardness is calculated according to the h value and constants N and S, and the Rockwell hardness is calculated by contrasting GB 1818:
in the first embodiment, the surface hardness of the disc brake pad and the drum brake pad is 70HRC, and in the first embodiment, the surface hardness of the disc brake pad and the drum brake pad is 62HRC, so that when the powdered styrene butadiene rubber is manufactured, the disc brake pad and the drum brake pad are premixed in a high-speed stirrer, the mixture is uniformly mixed, then a coating agent is added to form a powdered system, the powdered system is placed in a common stirrer again for constant-temperature stirring, a flocculating agent is added, the high-speed stirrer is intensively stirred again, the powdered system is powdered, coagulated and coprecipitated, and the rubber powder and the inorganic filler are uniformly mixed by means of high-speed shearing force and collision between the inorganic particles and elastic rubber particles, so that the powdered rubber can be ensured to be perfectly dispersed in the friction material.
The tensile strengths of the disc brake pad and the drum brake pad manufactured in the first example and the first comparative example were measured, respectively, by preparing the disc brake pad and the drum brake pad into a certain specification of test pieces, stretching the test pieces until the test pieces were broken by distributing the tensile strength using 100% tensile strength and 300% tensile strength on a tensile test instrument, and recording the tensile strengths of the respective disc brake pad and drum brake pad according to the strength values on the tensile test instrument in comparison with GB/T228-2002:
example one Central discThe brake pad of the brake pad and the brake pad of the drum type do not break at a constant tensile force of 100%, and have a breaking time of 47s at a constant tensile force of 300%, the brake pad of the brake pad and the brake pad of the comparative example have a breaking time of 35s at a constant tensile force of 100%, and have a breaking time of 22s at a constant tensile force of 300%, so that the surface-modified MO has a barrier effect on styrene butadiene rubber particles by adding kaolin when preparing the powdered rubber1The prepared SBR/MO powder styrene butadiene rubber has better mechanical property, obviously reduces long-term deformation and improves tensile strength.
Then, the powder forming rate of the SBR/MO powder styrene-butadiene rubber in the first embodiment and the second embodiment is respectively detected, standard sieves with the size of 2.0mm.0.9mm and 0.45mm are respectively used for sieving, the mass of each stage of SBR/MO powder styrene-butadiene rubber is weighed and recorded, and the sieving rate is calculated as the powder forming rate:
the powder yield of the SBR/MO powdered styrene-butadiene rubber in the first example is 100%, and the powder yield of the SBR/MO powdered styrene-butadiene rubber in the second example is 90%, so that kaolin is added in the preparation of the powdered styrene-butadiene rubber to have an isolation effect on styrene-butadiene rubber particles, so that the system is easy to pulverize, and the powder yield is high.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The preparation method of the powder styrene-butadiene rubber friction material is characterized by comprising the following raw materials: styrene butadiene latex (SBR), kaolin (MO), high molecular resin, calcium chloride aqueous solution and ammonia water (NH)4OH）；
The preparation method of the powder styrene-butadiene rubber friction material comprises the following steps:
s1: sequentially adding water and styrene butadiene latex (SBR) into a polymerization kettle, stirring and heating, and adding an oxidant for crosslinking reaction to obtain surface crosslinked styrene butadiene latex;
s2: mixing Kaolin (MO)1) Dispersed in ammonia water (NH)4OH), adding a surface modifier, heating in a water bath to 80-85 ℃ in the stirring process, stirring at constant temperature, and reacting for 1 h;
s3: adding cross-linked styrene-butadiene latex into the stirring product in the S2, premixing in a high-speed stirrer, adding a coating agent after uniformly mixing to form a powder system, placing the powder system in a common stirrer again, stirring at constant temperature for 1h, adding a flocculating agent, strongly stirring in the high-speed stirrer again, and performing powder coagulation and coprecipitation on the powder system;
s4: filtering to remove water, washing with tap water for 3-4 times, dewatering in a dryer, sieving, and drying in an oven to constant weight to obtain SBR/MO powder styrene butadiene rubber.
2. The method for preparing a powdered styrene-butadiene rubber friction material as claimed in claim 1, wherein the method comprises the following steps: the solid content of the styrene-butadiene latex (SBR) is 21 percent, and the kaolin (MO) is selected from MO with the particle size1The polymer resin is a free radical copolymerization product of vinyl monomer, the concentration of the calcium chloride aqueous solution is 5 percent, and the ammonia water (NH)4OH) in a concentration of 25% to 27%.
3. The method for preparing a powdered styrene-butadiene rubber friction material as claimed in claim 1, wherein the method comprises the following steps: the kaolin (MO)1) As a reaction filler, the polymer resin is used as a coating agent, and the calcium chloride aqueous solution is used as a flocculating agent.
4. The method for preparing a powdered styrene-butadiene rubber friction material as claimed in claim 1, wherein the method comprises the following steps: the oxidant in S1 is organic peroxide, the organic peroxide is one of cumene hydroperoxide, tert-butyl hydroperoxide or hydrogen peroxide diisopropylbenzene, the surface modifier in S2 is stearic acid, and the drying temperature in S4 is 80-95 ℃.
5. The application of the powder styrene-butadiene rubber friction material is characterized in that: the SBR/MO powdered styrene-butadiene rubber is mainly applied to industrial manufacturing, and particularly can be applied to manufacturing disc brake pads and drum brake pads.
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