CN116751414B - High-temperature-resistant rubber sealing ring and preparation method thereof - Google Patents
High-temperature-resistant rubber sealing ring and preparation method thereof Download PDFInfo
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 111
- 238000007789 sealing Methods 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 33
- 239000000194 fatty acid Substances 0.000 claims abstract description 33
- 229930195729 fatty acid Natural products 0.000 claims abstract description 33
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 32
- 239000000539 dimer Substances 0.000 claims abstract description 32
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 24
- 239000004014 plasticizer Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 17
- AGBQKNBQESQNJD-UHFFFAOYSA-M lipoate Chemical compound [O-]C(=O)CCCCC1CCSS1 AGBQKNBQESQNJD-UHFFFAOYSA-M 0.000 claims abstract description 14
- 235000019136 lipoic acid Nutrition 0.000 claims abstract description 14
- 229960002663 thioctic acid Drugs 0.000 claims abstract description 14
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 13
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 13
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 13
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 230000003213 activating effect Effects 0.000 claims abstract description 5
- 239000006229 carbon black Substances 0.000 claims description 32
- 229920000459 Nitrile rubber Polymers 0.000 claims description 27
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- XENVCRGQTABGKY-ZHACJKMWSA-N chlorohydrin Chemical compound CC#CC#CC#CC#C\C=C\C(Cl)CO XENVCRGQTABGKY-ZHACJKMWSA-N 0.000 claims description 17
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 17
- 239000000395 magnesium oxide Substances 0.000 claims description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 11
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 11
- 239000011787 zinc oxide Substances 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 8
- 235000021355 Stearic acid Nutrition 0.000 claims description 8
- 239000004200 microcrystalline wax Substances 0.000 claims description 8
- 235000019808 microcrystalline wax Nutrition 0.000 claims description 8
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 8
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 8
- 239000008117 stearic acid Substances 0.000 claims description 8
- 239000005662 Paraffin oil Substances 0.000 claims description 7
- 239000012190 activator Substances 0.000 claims description 7
- 239000003963 antioxidant agent Substances 0.000 claims description 7
- 235000006708 antioxidants Nutrition 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 229920006027 ternary co-polymer Polymers 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 5
- 239000013543 active substance Substances 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical class C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims description 4
- 239000010705 motor oil Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000002530 phenolic antioxidant Substances 0.000 claims description 3
- 239000001993 wax Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 9
- 229910052725 zinc Inorganic materials 0.000 description 9
- 239000011701 zinc Substances 0.000 description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 7
- 229910052749 magnesium Inorganic materials 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 5
- 239000003566 sealing material Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- -1 alkyl disulfide Chemical compound 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C08L9/02—Copolymers with acrylonitrile
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the field of rubber, in particular to a high-temperature-resistant rubber sealing ring and a preparation method thereof, wherein the high-temperature-resistant rubber sealing ring comprises the following raw materials in parts by weight: 100 parts of rubber, 4-9 parts of an activating agent, 1-2 parts of a co-activating agent, 1-4 parts of a chemical anti-aging agent, 0.5-1.5 parts of a physical anti-aging agent, 70-90 parts of a reinforcing agent, 3-8 parts of a plasticizer, 10-15 parts of hydrogenated dimer fatty acid, 4-10 parts of ferric chloride, 2-5 parts of lipoic acid, 3-5 parts of a cross-linking agent DCP and 1-2 parts of an accelerator DM.
Description
Technical Field
The invention relates to the technical field of sealing rings, in particular to a high-temperature-resistant rubber sealing ring and a preparation method thereof.
Background
The existing sealing ring often faces a series of technical problems in a high-temperature environment, for example, the conventional rubber sealing ring is easy to age, deform, harden and the like due to temperature change and pressure change in the high-temperature environment, so that the sealing performance is reduced and even fails. Under some special working conditions, such as high-speed rotation, high pressure and the like, the sealing ring can also face the problem of insufficient wear resistance. The nitrile rubber sealing ring has good oil resistance, wear resistance, weather resistance and ageing resistance. However, nitrile rubber also has some disadvantages in a high temperature environment, the heat resistance of the nitrile rubber is relatively low, the temperature resistance is generally in the range of-40 ℃ to 120 ℃, and the nitrile rubber can have problems of hardening, losing elasticity, reducing sealing performance and the like in the high temperature environment; nitrile rubber is relatively poor in resistance to oxidizing agents and is susceptible to aging due to the influence of the oxidizing agents, nitrile rubber is relatively low in resistance to some organic solvents and chemicals, for example, cannot be used for polar solvents such as ketone, ozone, nitrohydrocarbon, MEK and chloroform, and under high-temperature environment, some solvents and chemicals can react with nitrile rubber to cause swelling, softening, loss of elasticity and the like of materials, and the nitrile rubber itself is poor in corrosion resistance.
The neoprene has good corrosion resistance and certain high temperature resistance. However, neoprene also has some disadvantages in a high temperature environment, such as low heat resistance, relatively low heat resistance compared to some special high temperature rubber materials, such as Fluororubber (FKM) or silicone rubber (VMQ), and in a high temperature environment, the neoprene may have problems of hardening, losing elasticity, reducing sealing performance, etc.; the neoprene is easily affected by oxidation in a high-temperature environment, so that the ageing and performance of the material are reduced, and the neoprene can be hardened, cracked and other problems; neoprene is relatively low in resistance to some organic solvents and chemicals. Under high temperature conditions, some solvents and chemicals may react with neoprene, resulting in swelling, softening, loss of elasticity, etc. of the material.
The service lives of the two sealing rings are limited, inconvenience is brought to practical application, the reliability, the economy and the like of the sealing rings are affected, and the performances such as high temperature resistance, durability and wear resistance of the existing sealing rings can not meet the use requirements.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-temperature-resistant rubber sealing ring and a preparation method thereof. The sealing ring with excellent high-temperature mechanical property, durability and wear resistance is obtained by screening and formulation design of the sealing ring material, the service life and performance stability of the sealing ring in a high-temperature environment are obviously improved, and the sealing ring can be used in an environment of 130 ℃ for a long time. The preparation method of the invention is simple, convenient to operate and has the characteristic of environmental protection.
The invention is realized by the following technical scheme: the high temperature resistant rubber sealing ring comprises the following raw materials in parts by weight:
100 parts of rubber, namely a rubber-based adhesive,
4-9 parts of an activating agent,
1-2 parts of auxiliary activator,
1-4 parts of chemical anti-aging agent,
0.5 to 1.5 portions of physical anti-aging agent,
70-90 parts of reinforcing agent,
3-8 parts of plasticizer, namely,
10-15 parts of hydrogenated dimer fatty acid,
4-10 parts of ferric chloride,
2-5 parts of lipoic acid,
3-5 parts of a cross-linking agent DCP,
1-2 parts of accelerator DM.
Preferably, the rubber is selected from one or more of nitrile rubber, neoprene rubber and chlorohydrin rubber;
preferably, the acrylonitrile content of the nitrile rubber is controlled to be 25-40%;
preferably, the chlorohydrin rubber is one of ternary copolymer rubber or binary copolymer rubber;
preferably, the activator is one or more of zinc oxide and magnesium oxide;
preferably, the hydrogenated dimer fatty acid has a CAS number of 61788-89-4;
preferably, the hydrogenated dimer fatty acid has a CAS number of 68783-41-5;
preferably, the co-activator is stearic acid;
preferably, the reinforcing agent is a combination of carbon black and white carbon black;
preferably, the carbon black is one or more of N220, N234, N330, N326, N339, N550, N660 and N774;
preferably, the specific surface area of the white carbon black is 350-720 m 2 The specific surface area of the white carbon black is tested by adopting a nitrogen adsorption method;
preferably, the plasticizer is one of paraffin oil, DOP and engine oil;
preferably, the chemical antioxidant is a combination of diphenylamines and phenolic antioxidants;
preferably, the chemical antioxidants are RD and 4010NA;
preferably, the physical anti-aging agent is waxes;
preferably, the physical anti-aging agent is microcrystalline wax;
preferably, the high-temperature-resistant rubber sealing ring comprises the following raw materials in parts by weight: 70-85 parts of nitrile rubber, 5-25 parts of neoprene rubber, 5-10 parts of chlorohydrin rubber, 1-4 parts of an anti-aging agent, 0.5-1.5 parts of microcrystalline wax, 2-5 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of magnesium oxide, 10-15 parts of hydrogenated dimer fatty acid (CAS number 61788-89-4), 60-70 parts of carbon black, 20-10 parts of white carbon black, 3-8 parts of a plasticizer, 3-5 parts of a cross-linking agent DCP, 1-2 parts of an accelerator DM, 4-10 parts of ferric chloride and 2-5 parts of lipoic acid;
preferably, the high-temperature-resistant rubber sealing ring comprises the following raw materials in parts by weight: 85 parts of nitrile rubber, 5 parts of neoprene rubber, 10 parts of chlorohydrin rubber, 2.5 parts of RD, 1.5 parts of 4010NA, 0.8 part of microcrystalline wax, 4 parts of zinc oxide, 1 part of stearic acid, 2 parts of magnesium oxide, 13 parts of hydrogenated dimer fatty acid, 660 parts of carbon black N, 12 parts of white carbon black, 6 parts of paraffin oil, 4.5 parts of a cross-linking agent DCP, 1 part of an accelerator DM, 9 parts of ferric chloride and 4 parts of lipoic acid.
The preparation method of the high-temperature-resistant rubber sealing ring comprises the following steps of:
s1, heating an open mill to 30-35 ℃, setting the roll spacing to 0.2-0.8mm, adding rubber into the open mill, plasticating for 10-15min, discharging rubber, tabletting, discharging tablets, cooling to room temperature and standing for 4-5h to obtain primary plasticated rubber;
s2, heating an open mill to 25-30 ℃, setting the roll spacing to 0.4-0.6mm, adding the primary plasticated rubber obtained in the S1 into the open mill for plasticating for 10-20min, and then obtaining secondary plasticated rubber by discharging rubber, tabletting, discharging tablets, cooling to room temperature and standing for 3-5 h;
s3, heating an internal mixer to 80-90 ℃, adding the secondary plasticated rubber in the S2, mixing for 2-5min, sequentially adding an active agent, a chemical anti-aging agent, a physical anti-aging agent and hydrogenated dimer fatty acid, mixing for 1-2min, adding a reinforcing agent and a plasticizer, mixing for 3-5min, and then discharging rubber, tabletting, discharging, cooling to room temperature and standing for 3-5h to obtain primary mixed rubber;
s4, putting the primary rubber compound obtained in the step S3 into an internal mixer, mixing for 2-3min, sequentially adding a cross-linking agent DCP, an accelerator DM, ferric chloride and lipoic acid, mixing for 1.5-3min, discharging rubber, and putting into an open mill for thin-passing for 5-8 times to obtain secondary rubber compound;
s5, putting the secondary rubber compound in the S4 into a die, vulcanizing for 5-20min under the pressure of 15-20MPa and the temperature of 150-170 ℃, and opening the die to obtain the high-temperature-resistant rubber sealing ring.
Compared with the prior art, the invention has the following beneficial effects: in the invention, the nitrile rubber is selected as raw rubber, and has good water resistance, air tightness and good adhesive property, but the heat resistance, crack resistance and ozone resistance of the nitrile rubber are not ideal, so that the neoprene rubber and the chlorohydrin rubber are added, and the performances of the rubber are complemented to obtain the high-performance composite rubber;
the mixture of RD and 4010NA is used as an anti-aging agent, the anti-aging agent RD has excellent protection effect on thermo-oxidative aging, and the anti-aging agent RD is used together with 4010NA and microcrystalline wax to have better heat resistance and aging resistance, so that the aging resistance of the sealing material is improved;
zinc oxide, magnesium oxide and hydrogenated dimer fatty acid are added, so that the stretching stress, tearing strength and tensile property of the sealing material are obviously enhanced. The zinc oxide and the magnesium oxide have two functions, namely, the active agent accelerates the vulcanization speed, improves the vulcanization degree and reduces the consumption of the vulcanizing agent; secondly, the zinc or magnesium hydrogenated dimer fatty acid is reacted with zinc oxide or magnesium oxide to generate zinc or magnesium hydrogenated dimer fatty acid under the combined action of heated pressure and heat in the vulcanization process of the sizing material, and under the action of a cross-linking agent DCP and an accelerator DM, peroxide decomposed peroxy free radicals trigger the zinc or magnesium hydrogenated dimer fatty acid to carry out polymerization reaction to generate zinc or magnesium hydrogenated dimer fatty acid dispersed in nano size, and when the zinc or magnesium hydrogenated dimer fatty acid is polymerized, a part of zinc or magnesium hydrogenated dimer fatty acid and rubber molecules are crosslinked to form a covalent bond cross-linking network; the other part is connected with each other through zinc ions or magnesium ions to form an ionic crosslinking network, ionic bonds are formed between molecular chains, finally, ionic covalent bonds are formed by the ionic bonds and covalent bonds to form a complex reinforcing form, and two structures exist in a rubber system according to different dosages of hydrogenated dimer fatty acid, namely a nano-disperse structure (generated by in-situ polymerization of zinc hydrogenated dimer fatty acid or zinc hydrogenated dimer fatty acid) and a micro-disperse structure (particles of residual zinc hydrogenated dimer fatty acid or magnesium hydrogenated dimer fatty acid), so that the stretching stress, tearing strength and stretching performance of the sealing material are improved.
The lipoic acid and the ferric chloride are added, so that the compression set and the durability of the sealing material in a high-temperature environment and the wear resistance of the material in the high-temperature environment are obviously improved. The lipoic acid not only contains a disulfide five-membered ring structure, but also contains carboxyl functional groups, alkyl disulfide on the five-membered ring has higher ring tension, sulfur free radicals are generated by opening the disulfide five-membered ring when the sizing material is vulcanized, long-chain molecules formed by ring opening polymerization are taken as molecular main chains, and double bonds in nitrile rubber and chloroprene rubber can react to form a reaction product with FeCl 3 The white carbon black and the like have synergistic effect and constructThe supermolecular network structure with dynamic disulfide bonds, hydrogen bonds and metal ion coordination bonds is characterized in that functional groups capable of forming supermolecular interactions with silica in white carbon black and active silicon hydroxyl existing on the outer surface are introduced into a rubber matrix in a high-temperature environment, the functional groups can be used as physical crosslinking points in the material, when the rubber material is subjected to large tensile and compression deformation, the physical crosslinking points can be used as sacrificial bonds to break to provide energy dissipation, and in the high-temperature environment, after original molecular bonds break or when the rubber material receives friction force, stable networks can be formed again through the dynamic disulfide bonds, the hydrogen bonds and the metal ion coordination bonds, so that compression permanent deformation and durability of the sealing material in the high-temperature environment and wear resistance of the material in the high-temperature environment are remarkably improved.
Description of the embodiments
The invention is realized by the following technical scheme:
100 parts of rubber, namely a rubber-based adhesive,
4-9 parts of an activating agent,
1-2 parts of auxiliary activator,
1-4 parts of chemical anti-aging agent,
0.5 to 1.5 portions of physical anti-aging agent,
70-90 parts of reinforcing agent,
3-8 parts of plasticizer, namely,
10-15 parts of hydrogenated dimer fatty acid,
4-10 parts of ferric chloride,
2-5 parts of lipoic acid,
3-5 parts of a cross-linking agent DCP,
1-2 parts of accelerator DM.
The rubber is one or more of nitrile rubber, chloroprene rubber and chlorohydrin rubber;
the acrylonitrile content of the nitrile rubber is controlled to be 25-40%;
the chlorohydrin rubber is one of ternary copolymer rubber or binary copolymer rubber;
the CAS number of the hydrogenated dimer fatty acid is 61788-89-4 or 68783-41-5;
the activator is one or more of zinc oxide and magnesium oxide;
the auxiliary activator is stearic acid;
the reinforcing agent is a composition of carbon black and white carbon black;
the carbon black is one or more of N220, N234, N330, N326, N339, N550, N660 and N774.
The specific surface area of the white carbon black is 350-720 m 2 The specific surface area of the white carbon black is tested by adopting a nitrogen adsorption method;
the plasticizer is one of paraffin oil, DOP and engine oil;
the chemical antioxidant is a composition of diphenylamine and phenolic antioxidants;
the physical anti-aging agent is wax;
the preparation method of the high-temperature-resistant rubber sealing ring comprises the following steps of:
s1, heating an open mill to 30-35 ℃, setting the roll spacing to 0.2-0.8mm, adding rubber into the open mill, plasticating for 10-15min, discharging rubber, tabletting, discharging tablets, cooling to room temperature and standing for 4-5h to obtain primary plasticated rubber;
s2, heating an open mill to 25-30 ℃, setting the roll spacing to 0.4-0.6mm, adding the primary plasticated rubber obtained in the S1 into the open mill for plasticating for 10-20min, and then obtaining secondary plasticated rubber by discharging rubber, tabletting, discharging tablets, cooling to room temperature and standing for 3-5 h;
s3, heating an internal mixer to 80-90 ℃, adding the secondary plasticated rubber in the S2, mixing for 2-5min, sequentially adding an active agent, a chemical anti-aging agent, a physical anti-aging agent and hydrogenated dimer fatty acid, mixing for 1-2min, adding a reinforcing agent and a plasticizer, mixing for 3-5min, and then discharging rubber, tabletting, discharging, cooling to room temperature and standing for 3-5h to obtain primary mixed rubber;
s4, putting the primary rubber compound obtained in the step S3 into an internal mixer, mixing for 2-3min, sequentially adding a cross-linking agent DCP, an accelerator DM, ferric chloride and lipoic acid, mixing for 1.5-3min, discharging rubber, and putting into an open mill for thin-passing for 5-8 times to obtain secondary rubber compound;
s5, putting the secondary rubber compound in the S4 into a die, vulcanizing for 5-20min under the pressure of 15-20MPa and the temperature of 150-170 ℃, and opening the die to obtain the high-temperature-resistant rubber sealing ring.
Five examples and comparative examples of the high temperature resistant rubber seal ring in the amounts according to the above formulations are given below in Table 1.
TABLE 1
| Name of the name | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Nitrile rubber | 70 | 80 | 82 | 85 | 85 | 70 | 70 | 70 |
| Neoprene rubber | 25 | 15 | 10 | 5 | 5 | 30 | 30 | 30 |
| Chlorohydrin rubber | 5 | 5 | 8 | 10 | 10 | / | / | / |
| Anti-aging agent RD | 2 | 3 | 1 | 2.5 | 1.5 | 2 | 2 | 2 |
| Anti-aging agent 4010NA | 2 | 1 | 3 | 1.5 | 2.5 | 2 | 2 | 2 |
| Microcrystalline wax | 1.5 | 1 | 1.2 | 0.8 | 0.5 | 1.5 | 1.5 | 1.5 |
| Zinc oxide | 2 | 5 | 3 | 4 | 5 | 2 | 2 | 2 |
| Magnesium oxide | 1 | 2 | 1 | 2 | 2 | 1 | 1 | 1 |
| Stearic acid | 2 | 2 | 1 | 1 | 1 | 2 | 2 | 2 |
| Hydrogenated dimerized fatty acids | 10 | 15 | 12 | 13 | 14 | 0 | 10 | 0 |
| Carbon black | 70 | 60 | 65 | 68 | 62 | 70 | 70 | 70 |
| White carbon black | 10 | 20 | 15 | 12 | 18 | 10 | 10 | 10 |
| Plasticizer(s) | 3 | 8 | 5 | 6 | 7 | 3 | 3 | 3 |
| Cross-linking agent DCP | 3 | 4 | 3.5 | 4.5 | 5 | 3 | 3 | 3 |
| Accelerator DM | 2 | 1 | 1.5 | 1 | 1 | 2 | 2 | 2 |
| Ferric chloride | 10 | 4 | 7 | 9 | 9 | 10 | 0 | 0 |
| Lipoic acid | 5 | 2 | 3 | 4 | 5 | 5 | 0 | 0 |
The nitrile rubber selected in example 1 had an acrylonitrile content of 25%, a carbon black of N220 and a specific surface area of 350m 2 The chlorohydrin rubber is a ternary copolymer rubber, the plasticizer is paraffin oil, and the CAS number of the hydrogenated dimer fatty acid is 61788-89-4.
The nitrile rubber selected in example 2 had an acrylonitrile content of 40%, a carbon black of N774 and a specific surface area of 720 m 2 The chlorohydrin rubber is binary copolymer rubber, the plasticizer is DOP, and the CAS number of the hydrogenated dimer fatty acid is 68783-41-5.
Example 3 the nitrile rubber selected was 30% acrylonitrile, N550 carbon black and 450m white carbon black specific surface area 2 The chlorohydrin rubber is ternary copolymer rubber, the plasticizer is engine oil, and the CAS number of the hydrogenated dimer fatty acid is 61788-89-4.
The nitrile rubber selected in example 4 had an acrylonitrile content of 35%, a carbon black of N660 and a specific surface area of 500 m 2 The chlorohydrin rubber is binary copolymer rubber, the plasticizer is paraffin oil, and the CAS number of the hydrogenated dimer fatty acid is 61788-89.
The nitrile rubber selected in example 5 had an acrylonitrile content of 35%, a carbon black of N330 and a specific surface area of 600 m 2 The chlorohydrin rubber is ternary copolymer rubber, the plasticizer is DOP, and the CAS number of the hydrogenated dimer fatty acid is 61788-89.
Comparative examples 1-3 the raw materials were the same as in example 1 except that the amounts of the raw materials used were different.
Shore A hardness was tested according to GB/T531.1-2008; tensile properties and tear strength were tested according to GB/T528-2009 and GB/T529-2008 respectively, with tensile rates of 500 mm/min; compression set was measured according to GB/T7759.1-2015 at 100℃X 24 h.
The amount of acle abrasion was measured in accordance with GB/T1689-2014.
The test results of examples 1-5 and comparative examples 1-3 are shown in Table 2.
TABLE 2
The test data show that the high-temperature-resistant rubber sealing ring improves the mechanical property, small compression set, durability and wear resistance under high temperature conditions of the sealing ring through screening sealing ring materials.
Claims (8)
1. The high-temperature-resistant rubber sealing ring is characterized by comprising the following raw materials in parts by weight: 100 parts of rubber, 4-9 parts of an activating agent, 1-2 parts of a co-activating agent, 1-4 parts of a chemical anti-aging agent, 0.5-1.5 parts of a physical anti-aging agent, 70-90 parts of a reinforcing agent, 3-8 parts of a plasticizer, 10-15 parts of hydrogenated dimer fatty acid, 4-10 parts of ferric chloride, 2-5 parts of lipoic acid, 3-5 parts of a cross-linking agent DCP and 1-2 parts of an accelerator DM, wherein the rubber is a mixture of nitrile rubber, chloroprene rubber and chlorohydrin rubber, the acrylonitrile content of the nitrile rubber is controlled to be 25-40%, the chlorohydrin rubber is one of ternary copolymer rubber or binary copolymer rubber, the CAS number of the hydrogenated dimer fatty acid is 68783-41-5, and the activating agent is one or more of zinc oxide and magnesium oxide.
2. The high temperature resistant rubber seal ring of claim 1 wherein said co-activator is stearic acid, said reinforcing agent is a combination of carbon black and white carbon black, said plasticizer is one of paraffin oil, DOP, engine oil, said chemical antioxidant is a combination of diphenylamines and phenolic antioxidants, and said physical antioxidant is a wax.
3. The high temperature resistant rubber seal ring of claim 2, wherein the carbon black is one or more of N220, N234, N330, N326, N339, N550, N660, N774.
4. The high temperature resistant rubber seal ring according to claim 2, wherein the specific surface area of the white carbon black is 350-720 m 2 /g。
5. The high temperature resistant rubber seal ring of claim 1 wherein said chemical antioxidants are RD and 4010NA and said physical antioxidants are microcrystalline wax.
6. The high-temperature-resistant rubber sealing ring as claimed in claim 1, wherein the raw materials comprise, by weight: 70-85 parts of nitrile rubber, 5-25 parts of neoprene rubber, 5-10 parts of chlorohydrin rubber, 1-4 parts of chemical anti-aging agent, 0.5-1.5 parts of microcrystalline wax, 2-5 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of magnesium oxide, 10-15 parts of hydrogenated dimer fatty acid, 60-70 parts of carbon black, 20-10 parts of white carbon black, 3-8 parts of plasticizer, 3-5 parts of cross-linking agent DCP, 1-2 parts of accelerator DM, 4-10 parts of ferric chloride and 2-5 parts of lipoic acid.
7. The high-temperature-resistant rubber sealing ring as claimed in claim 6, wherein the raw materials comprise, by weight: 85 parts of nitrile rubber, 5 parts of neoprene rubber, 10 parts of chlorohydrin rubber, 2.5 parts of RD, 1.5 parts of 4010NA, 0.8 part of microcrystalline wax, 4 parts of zinc oxide, 1 part of stearic acid, 2 parts of magnesium oxide, 13 parts of hydrogenated dimer fatty acid, 660 parts of carbon black N, 12 parts of white carbon black, 6 parts of paraffin oil, 4.5 parts of a cross-linking agent DCP, 1 part of an accelerator DM, 9 parts of ferric chloride and 4 parts of lipoic acid.
8. A method for preparing the high temperature resistant rubber seal ring as claimed in any one of claims 1 to 7, characterized in that:
s1, heating an open mill to 30-35 ℃, setting the roll spacing to 0.2-0.8mm, adding rubber into the open mill, plasticating for 10-15min, discharging rubber, tabletting, discharging tablets, cooling to room temperature and standing for 4-5h to obtain primary plasticated rubber;
s2, heating an open mill to 25-30 ℃, setting the roll spacing to 0.4-0.6mm, adding the primary plasticated rubber obtained in the S1 into the open mill for plasticating for 10-20min, and then obtaining secondary plasticated rubber by discharging rubber, tabletting, discharging tablets, cooling to room temperature and standing for 3-5 h;
s3, heating an internal mixer to 80-90 ℃, adding the secondary plasticated rubber in the S2, mixing for 2-5min, sequentially adding an active agent, a chemical anti-aging agent, a physical anti-aging agent and hydrogenated dimer fatty acid, mixing for 1-2min, adding a reinforcing agent and a plasticizer, mixing for 3-5min, and then discharging rubber, tabletting, discharging, cooling to room temperature and standing for 3-5h to obtain primary mixed rubber;
s4, putting the primary rubber compound obtained in the step S3 into an internal mixer, mixing for 2-3min, sequentially adding a cross-linking agent DCP, an accelerator DM, ferric chloride and lipoic acid, mixing for 1.5-3min, discharging rubber, and putting into an open mill for thin-passing for 5-8 times to obtain secondary rubber compound;
s5, putting the secondary rubber compound in the S4 into a die, vulcanizing for 5-20min under the pressure of 15-20MPa and the temperature of 150-170 ℃, and opening the die to obtain the high-temperature-resistant rubber sealing ring.
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