CN116874896B - Low-temperature-resistant rubber sealing gasket and preparation method thereof - Google Patents
Low-temperature-resistant rubber sealing gasket and preparation method thereof Download PDFInfo
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 69
- 239000005060 rubber Substances 0.000 title claims abstract description 69
- 238000007789 sealing Methods 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 52
- 239000000835 fiber Substances 0.000 claims abstract description 37
- 229920000728 polyester Polymers 0.000 claims abstract description 37
- 229910052582 BN Inorganic materials 0.000 claims abstract description 23
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000005062 Polybutadiene Substances 0.000 claims abstract description 23
- 229920005560 fluorosilicone rubber Polymers 0.000 claims abstract description 23
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 23
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 23
- 239000003822 epoxy resin Substances 0.000 claims abstract description 20
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 20
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 claims abstract description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 239000011593 sulfur Substances 0.000 claims abstract description 10
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims description 30
- 239000011812 mixed powder Substances 0.000 claims description 19
- 238000004073 vulcanization Methods 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- OWRCNXZUPFZXOS-UHFFFAOYSA-N 1,3-diphenylguanidine Chemical compound C=1C=CC=CC=1NC(=N)NC1=CC=CC=C1 OWRCNXZUPFZXOS-UHFFFAOYSA-N 0.000 claims description 6
- AUZONCFQVSMFAP-UHFFFAOYSA-N disulfiram Chemical compound CCN(CC)C(=S)SSC(=S)N(CC)CC AUZONCFQVSMFAP-UHFFFAOYSA-N 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 3
- KEQFTVQCIQJIQW-UHFFFAOYSA-N N-Phenyl-2-naphthylamine Chemical compound C=1C=C2C=CC=CC2=CC=1NC1=CC=CC=C1 KEQFTVQCIQJIQW-UHFFFAOYSA-N 0.000 claims description 2
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 3
- 230000000052 comparative effect Effects 0.000 description 13
- 238000012986 modification Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 238000003825 pressing Methods 0.000 description 5
- 238000000498 ball milling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/80—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with boron or compounds thereof, e.g. borides
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/55—Epoxy resins
-
- 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
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
-
- 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
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/32—Polyesters
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Gasket Seals (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of rubber gaskets, and provides a low-temperature-resistant rubber gasket and a preparation method thereof, wherein the low-temperature-resistant rubber gasket comprises the following components in parts by weight: 35-80 parts of butadiene rubber, 30-45 parts of styrene-butadiene rubber, 20-30 parts of fluorosilicone rubber, 14-18 parts of epoxy resin powder, 2-4 parts of boron nitride powder, 6-8 parts of polyester fiber, 0.2-1 part of anti-aging agent, 0.5-1.5 parts of accelerator, 0.6-0.8 part of sulfur and 0.6-0.8 part of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane. Through the technical scheme, the problem that the low temperature resistance of the rubber sealing gasket in the prior art is poor is solved.
Description
Technical Field
The invention relates to the technical field of rubber sealing gaskets, in particular to a low-temperature-resistant rubber sealing gasket and a preparation method thereof.
Background
The rubber gasket is a self-expansion gasket, has the performances of oil resistance, acid and alkali resistance, low temperature resistance, aging resistance and the like, and is widely applied to the fields of automobiles, electronics, chemical industry, static resistance, flame retardance, food and the like. The low temperature environment can reduce the elasticity of the rubber material and deteriorate the mechanical properties, so that the compression resistance of the sealing gasket is reduced, and the sealing gasket is possibly embrittled and damaged to influence the sealing property. With the development of scientific technology, the industrial production has put higher demands on the low temperature resistance of rubber gaskets. The existing rubber sealing gasket has poor low temperature resistance and limits the application range. Therefore, research and development of a novel low temperature resistant rubber gasket is needed.
Disclosure of Invention
The invention provides a low temperature resistant rubber sealing gasket and a preparation method thereof, which solve the problem of poor low temperature resistance of the rubber sealing gasket in the related art.
The technical scheme of the invention is as follows:
the invention provides a low-temperature-resistant rubber sealing gasket which comprises the following components in parts by weight: 35-80 parts of butadiene rubber, 30-45 parts of styrene-butadiene rubber, 20-30 parts of fluorosilicone rubber, 14-18 parts of epoxy resin powder, 2-4 parts of boron nitride powder, 6-8 parts of polyester fiber, 0.2-1 part of anti-aging agent, 0.5-1.5 parts of accelerator, 0.6-0.8 part of sulfur and 0.6-0.8 part of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane.
As a further technical scheme, the mass ratio of the butadiene rubber to the styrene-butadiene rubber to the fluorosilicone rubber is 4-5:3:2.
As a further technical scheme, the particle size of the epoxy resin powder is 3-5 mu m.
As a further technical scheme, the particle size of the boron nitride powder is 40-60nm.
As a further technical scheme, the diameter of the polyester fiber is 10-25 mu m.
As a further technical scheme, the anti-aging agent is one or more of N-phenyl-beta-naphthylamine, N-N' -diphenyl-p-phenylenediamine and N-phenyl-alpha-aniline.
As a further technical scheme, the accelerator is one or more of symmetrical diphenyl guanidine, tetraethylthiuram disulfide and dibenzothiazyl disulfide.
The invention also provides a preparation method of the low-temperature-resistant rubber sealing gasket, which comprises the following steps:
s1, uniformly mixing epoxy resin powder and boron nitride powder to obtain mixed powder, adsorbing the mixed powder on the surface of polyester fiber, and heating and sintering to obtain modified polyester fiber;
s2, mixing butadiene rubber, styrene-butadiene rubber and fluorosilicone rubber for 5-7min, adding the modified polyester fiber, mixing for 2-4min, adding an anti-aging agent and an accelerator after uniform dispersion, cutting and turning after powder feeding is finished, adding sulfur and 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, mixing uniformly, thinning, and vulcanizing to obtain a rubber composite material;
and S3, after the rubber composite material is pressed and formed, the low-temperature-resistant rubber sealing gasket is obtained.
As a further technical scheme, in the step S1, the temperature is 120-130 ℃ and the pressure is 3-5MPa during heating and sintering.
As a further technical scheme, in the step S2, the temperature during the vulcanization treatment is 90-110 ℃, the pre-pressing pressure is 5-7MPa, the vulcanization pressure is 9-11MPa, and the vulcanization time is 10-15min.
The working principle and the beneficial effects of the invention are as follows:
1. according to the invention, the low temperature resistance of the rubber sealing gasket is improved through blending modification of butadiene rubber, styrene butadiene rubber and fluorosilicone rubber. When the mass ratio of butadiene rubber to styrene-butadiene rubber to fluorosilicone rubber is 4-5:3:2, the mechanical property of the rubber sealing gasket in a low-temperature environment is further enhanced, wherein the compression set value of the rubber sealing gasket tested under the conditions of minus 30 ℃ multiplied by 72h multiplied by 25% can reach 18%.
2. According to the invention, the surface modification is carried out on the polyester fiber by adopting the epoxy resin powder and the nano-grade boron nitride powder, so that not only are the strength and the elasticity of the polyester fiber enhanced, but also the compatibility of the polyester fiber and rubber is greatly improved, and further the polyester fiber is uniformly dispersed in the rubber sealing gasket, so that the low temperature resistance of the rubber sealing gasket is enhanced.
3. According to the invention, the epoxy resin powder and the boron nitride powder are uniformly mixed to obtain the mixed powder, and the mixed powder is used for carrying out surface modification on the polyester fibers, so that the fluidity of the epoxy resin powder is improved, the mixed powder can be uniformly coated on the surfaces of the polyester fibers, and the adsorption force between the mixed powder and the polyester fibers is increased by utilizing the characteristic that the nano-scale boron nitride powder is easy to adsorb, so that the mixed powder is prevented from falling off in the subsequent process steps, and the low temperature resistance of the rubber sealing gasket is further enhanced.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following examples and comparative examples, butadiene rubber was BR-9000, styrene-butadiene rubber was SBR-1502, fluorosilicone rubber was DM-1050, and epoxy resin powder was SH-SE55.
Example 1
The preparation method of the low-temperature-resistant rubber sealing gasket comprises the following steps:
s1, uniformly ball-milling and mixing 14 parts of epoxy resin powder and 2 parts of boron nitride powder to obtain mixed powder, adsorbing the mixed powder on the surface of 6 parts of polyester fiber, and heating and sintering at 120 ℃ under 3MPa to obtain modified polyester fiber;
wherein the average particle diameter of the epoxy resin powder is 4 mu m, the average particle diameter of the boron nitride powder is 50nm, and the average diameter of the polyester fiber is 17 mu m.
S2, mixing 40 parts of butadiene rubber, 30 parts of styrene-butadiene rubber and 20 parts of fluorosilicone rubber for 5min, adding the modified polyester fiber, mixing for 2min, adding 0.2 part of N-phenyl-alpha-aniline and 0.5 part of symmetrical diphenyl guanidine after the modified polyester fiber is uniformly dispersed, cutting and turning after powder feeding is finished, adding 0.6 part of sulfur and 0.6 part of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, uniformly mixing, thinning, and vulcanizing to obtain a rubber composite material;
wherein the temperature during vulcanization is 90 ℃, the pre-pressing pressure is 5MPa, the vulcanization pressure is 9MPa, and the vulcanization time is 10min;
and S3, after the rubber composite material is pressed and formed, the low-temperature-resistant rubber sealing gasket is obtained.
Example 2
The preparation method of the low-temperature-resistant rubber sealing gasket comprises the following steps:
s1, uniformly ball-milling and mixing 16 parts of epoxy resin powder and 3 parts of boron nitride powder to obtain mixed powder, adsorbing the mixed powder on the surface of 7 parts of polyester fiber, and heating and sintering at 125 ℃ under 4MPa to obtain modified polyester fiber;
wherein the average particle diameter of the epoxy resin powder is 4 mu m, the average particle diameter of the boron nitride powder is 50nm, and the average diameter of the polyester fiber is 17 mu m.
S2, mixing 56 parts of butadiene rubber, 38 parts of styrene-butadiene rubber and 25 parts of fluorosilicone rubber for 6min, adding the modified polyester fiber, mixing for 3min, adding 0.6 part of N-phenyl-alpha-aniline and 1 part of symmetrical diphenyl guanidine after the mixture is uniformly dispersed, cutting and turning after powder feeding is finished, adding 0.7 part of sulfur and 0.7 part of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, uniformly mixing, thinning, and vulcanizing to obtain a rubber composite material;
wherein the temperature during vulcanization is 100 ℃, the pre-pressing pressure is 6MPa, the vulcanization pressure is 10MPa, and the vulcanization time is 13min;
and S3, after the rubber composite material is pressed and formed, the low-temperature-resistant rubber sealing gasket is obtained.
Example 3
The preparation method of the low-temperature-resistant rubber sealing gasket comprises the following steps:
s1, uniformly ball-milling and mixing 18 parts of epoxy resin powder and 4 parts of boron nitride powder to obtain mixed powder, adsorbing the mixed powder on the surface of 8 parts of polyester fiber, and heating and sintering at 130 ℃ under 5MPa to obtain modified polyester fiber;
wherein the average particle diameter of the epoxy resin powder is 4 mu m, the average particle diameter of the boron nitride powder is 50nm, and the average diameter of the polyester fiber is 17 mu m.
S2, mixing 75 parts of butadiene rubber, 45 parts of styrene-butadiene rubber and 30 parts of fluorosilicone rubber for 7min, adding the modified polyester fiber, mixing for 4min, adding 1 part of N-phenyl-alpha-aniline and 1.5 parts of symmetrical diphenyl guanidine after the mixture is uniformly dispersed, cutting and turning after powder feeding is finished, adding 0.8 part of sulfur and 0.8 part of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, uniformly mixing, thinning, and vulcanizing to obtain a rubber composite material;
wherein the temperature during vulcanization is 110 ℃, the pre-pressing pressure is 7MPa, the vulcanization pressure is 11MPa, and the vulcanization time is 15min;
and S3, after the rubber composite material is pressed and formed, the low-temperature-resistant rubber sealing gasket is obtained.
Example 4
The present example differs from example 1 only in that in step S2, the weight part of butadiene rubber is 35 parts, the weight part of styrene-butadiene rubber is 33 parts, and the weight part of fluorosilicone rubber is 22 parts.
Example 5
The present example differs from example 3 only in that in step S2, the weight part of butadiene rubber is 80 parts, the weight part of styrene-butadiene rubber is 42 parts, and the weight part of fluorosilicone rubber is 28 parts.
Example 6
The present example differs from example 1 only in that in step S1, the average particle diameter of the boron nitride powder is 4 μm.
Example 7
The present embodiment differs from embodiment 1 only in that in step S1, the epoxy resin powder and the boron nitride powder are not uniformly mixed, but both powders are directly adsorbed on the surface of the polyester fiber.
Comparative example 1
The present comparative example differs from example 3 only in that in step S2, the weight part of styrene-butadiene rubber was 72 parts, the weight part of fluorosilicone rubber was 47 parts, and butadiene rubber was not added.
Comparative example 2
The present comparative example differs from example 3 only in that in step S2, 82 parts by weight of butadiene rubber, 37 parts by weight of fluorosilicone rubber were added, and styrene-butadiene rubber was not added.
Comparative example 3
The comparative example differs from example 3 only in that in step S2, 71 parts by weight of butadiene rubber and 48 parts by weight of styrene-butadiene rubber were used, and no fluorosilicone rubber was added.
Comparative example 4
The present comparative example differs from example 3 only in that no boron nitride powder was added in step S1.
Comparative example 5
The preparation method of the low-temperature-resistant rubber sealing gasket comprises the following steps:
s1, mixing 75 parts of butadiene rubber, 45 parts of styrene-butadiene rubber and 30 parts of fluorosilicone rubber for 7min, adding 8 parts of polyester fiber, mixing for 4min, adding 1 part of N-phenyl-alpha-aniline and 1.5 parts of symmetrical diphenyl guanidine after the mixture is uniformly dispersed, cutting and turning after powder feeding is finished, adding 0.8 part of sulfur and 0.8 part of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, uniformly mixing, thinning, and vulcanizing to obtain a rubber composite material;
wherein the temperature during vulcanization is 110 ℃, the pre-pressing pressure is 7MPa, the vulcanization pressure is 11MPa, and the vulcanization time is 15min;
and S2, after the rubber composite material is pressed and formed, the low-temperature-resistant rubber sealing gasket is obtained.
The following performance tests were conducted on the rubber gaskets prepared in examples 1 to 7 and comparative examples 1 to 5:
(1) Brittle temperature: according to the standard of GB/T15256-2014 (determination of low temperature brittleness of vulcanized rubber or thermoplastic rubber (Multi-sample method)), the brittleness temperature of the rubber gasket during the use procedure A is measured;
(2) Compression performance: determination of compression set of vulcanizates or thermoplastic rubbers according to GB/T7759.2-2014 part 2: measuring the compression set value of the rubber sealing gasket under the standard of low temperature condition at-30 ℃ for 72 hours and the compression ratio of 25%;
the test results are shown in table 1 below.
TABLE 1 Low temperature resistance test results of rubber gasket
The test results of examples 1-7 show that the rubber sealing gasket prepared by the invention has good low temperature resistance, wherein the brittleness temperature can reach minus 118 ℃ at the minimum and the compression set value at minus 30 ℃ multiplied by 72h multiplied by 25% can reach 18% at the minimum. As is evident from the comparison of examples 1, 4 and 3 and 5, the low temperature resistance of the rubber gasket can be further enhanced when the mass ratio of butadiene rubber, styrene butadiene rubber and fluorosilicone rubber is 4-5:3:2. Comparison of the embodiment 1 and the embodiments 6-7 shows that the epoxy resin powder and the nano-grade boron nitride powder are uniformly mixed to obtain mixed powder, and the mixed powder is used for carrying out surface modification on the polyester fiber, so that the low temperature resistance of the rubber sealing gasket is improved.
Example 3 and comparative examples 1-3 show that the blending modification of the butadiene rubber, the styrene-butadiene rubber and the fluorosilicone rubber can improve the low temperature resistance of the rubber sealing gasket and make the rubber sealing gasket have more excellent low temperature mechanical properties than the blending modification of any two of the butadiene rubber, the styrene-butadiene rubber and the fluorosilicone rubber. Comparison of example 3 with comparative examples 4-5 shows that the addition of epoxy powder and boron nitride powder is beneficial for rubber gaskets to achieve lower brittleness temperatures and lower compression set values.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. The low temperature resistant rubber sealing gasket is characterized by comprising the following components in parts by weight: 35-80 parts of butadiene rubber, 30-45 parts of styrene-butadiene rubber, 20-30 parts of fluorosilicone rubber, 14-18 parts of epoxy resin powder, 2-4 parts of boron nitride powder, 6-8 parts of polyester fiber, 0.2-1 part of anti-aging agent, 0.5-1.5 parts of accelerator, 0.6-0.8 part of sulfur and 0.6-0.8 part of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane;
the preparation method of the low-temperature-resistant rubber sealing gasket comprises the following steps:
s1, uniformly mixing epoxy resin powder and boron nitride powder to obtain mixed powder, adsorbing the mixed powder on the surface of polyester fiber, and heating and sintering to obtain modified polyester fiber;
s2, mixing butadiene rubber, styrene-butadiene rubber and fluorosilicone rubber for 5-7min, adding the modified polyester fiber, mixing for 2-4min, adding an anti-aging agent and an accelerator after uniform dispersion, cutting and turning after powder feeding is finished, adding sulfur and 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, mixing uniformly, thinning, and vulcanizing to obtain a rubber composite material;
s3, after the rubber composite material is pressed and formed, the low-temperature-resistant rubber sealing gasket is obtained;
the particle size of the boron nitride powder is 40-60nm.
2. The low temperature resistant rubber gasket of claim 1, wherein the mass ratio of butadiene rubber, styrene butadiene rubber, and fluorosilicone rubber is 4-5:3:2.
3. The low temperature resistant rubber gasket of claim 1 wherein said epoxy resin powder has a particle size of 3-5 μm.
4. The low temperature resistant rubber gasket of claim 1 wherein said polyester fiber has a diameter of 10 to 25 μm.
5. The low temperature resistant rubber gasket of claim 1 wherein said anti-aging agent is one or more of N-phenyl- β -naphthylamine, N-N' -diphenyl-p-phenylenediamine, N-phenyl- α -aniline.
6. The low temperature resistant rubber gasket of claim 1 wherein said accelerator is one or more of symmetrical diphenyl guanidine, tetraethylthiuram disulfide, dibenzothiazyl disulfide.
7. The method for producing a low temperature resistant rubber gasket according to any one of claims 1 to 6, comprising the steps of:
s1, uniformly mixing epoxy resin powder and boron nitride powder to obtain mixed powder, adsorbing the mixed powder on the surface of polyester fiber, and heating and sintering to obtain modified polyester fiber;
s2, mixing butadiene rubber, styrene-butadiene rubber and fluorosilicone rubber for 5-7min, adding the modified polyester fiber, mixing for 2-4min, adding an anti-aging agent and an accelerator after uniform dispersion, cutting and turning after powder feeding is finished, adding sulfur and 2, 5-dimethyl-2, 5-bis (tert-butyl peroxy) hexane, mixing uniformly, thinning, and vulcanizing to obtain a rubber composite material;
s3, after the rubber composite material is pressed and formed, the low-temperature-resistant rubber sealing gasket is obtained;
the particle size of the boron nitride powder is 40-60nm.
8. The method for producing a low temperature resistant rubber gasket according to claim 7, wherein in step S1, the temperature at the time of the heat sintering is 120 to 130 ℃ and the pressure is 3 to 5MPa.
9. The method for producing a low temperature resistant rubber gasket according to claim 7, wherein in step S2, the temperature at the time of the vulcanization treatment is 90 to 110 ℃, the pre-compression pressure is 5 to 7MPa, the vulcanization pressure is 9 to 11MPa, and the vulcanization time is 10 to 15min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105778174A (en) * | 2016-04-26 | 2016-07-20 | 安徽润康橡塑科技有限公司 | Cold resistant rubber for vehicles |
| CN111423698A (en) * | 2020-05-12 | 2020-07-17 | 河北工业大学 | High-filling-amount hexagonal boron nitride nanosheet/fiber/polymer blocky composite material and preparation method thereof |
| CN111560689A (en) * | 2020-05-11 | 2020-08-21 | 江苏华信亚麻纺织有限公司 | High-elasticity flax-coated XLA fiber mercerized elastic fabric and preparation method thereof |
| CN116693955A (en) * | 2023-08-09 | 2023-09-05 | 河北华密新材科技股份有限公司 | Corrosion-resistant bushing rubber composite material and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105778174A (en) * | 2016-04-26 | 2016-07-20 | 安徽润康橡塑科技有限公司 | Cold resistant rubber for vehicles |
| CN111560689A (en) * | 2020-05-11 | 2020-08-21 | 江苏华信亚麻纺织有限公司 | High-elasticity flax-coated XLA fiber mercerized elastic fabric and preparation method thereof |
| CN111423698A (en) * | 2020-05-12 | 2020-07-17 | 河北工业大学 | High-filling-amount hexagonal boron nitride nanosheet/fiber/polymer blocky composite material and preparation method thereof |
| CN116693955A (en) * | 2023-08-09 | 2023-09-05 | 河北华密新材科技股份有限公司 | Corrosion-resistant bushing rubber composite material and preparation method thereof |
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