CN113004581A - Rubber composition for preventing discoloration and tire prepared from rubber composition - Google Patents
Rubber composition for preventing discoloration and tire prepared from rubber composition Download PDFInfo
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- CN113004581A CN113004581A CN202110121473.7A CN202110121473A CN113004581A CN 113004581 A CN113004581 A CN 113004581A CN 202110121473 A CN202110121473 A CN 202110121473A CN 113004581 A CN113004581 A CN 113004581A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 61
- 239000000203 mixture Substances 0.000 title claims abstract description 61
- 239000005060 rubber Substances 0.000 title claims abstract description 61
- 238000002845 discoloration Methods 0.000 title claims abstract description 17
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 239000004359 castor oil Substances 0.000 claims abstract description 20
- 235000019438 castor oil Nutrition 0.000 claims abstract description 20
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims abstract description 20
- 239000013078 crystal Substances 0.000 claims abstract description 18
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 17
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 16
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 16
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000008117 stearic acid Substances 0.000 claims abstract description 16
- 239000011787 zinc oxide Substances 0.000 claims abstract description 15
- 229920003244 diene elastomer Polymers 0.000 claims abstract description 11
- 239000004014 plasticizer Substances 0.000 claims abstract description 11
- 238000004073 vulcanization Methods 0.000 claims abstract description 11
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 8
- 239000006229 carbon black Substances 0.000 claims description 24
- 235000019241 carbon black Nutrition 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000010692 aromatic oil Substances 0.000 claims description 10
- 239000003607 modifier Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000003921 oil Substances 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 5
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 5
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 5
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 abstract description 13
- 230000032683 aging Effects 0.000 abstract description 10
- 150000001412 amines Chemical class 0.000 abstract description 10
- 239000001993 wax Substances 0.000 description 35
- 239000003963 antioxidant agent Substances 0.000 description 13
- 244000043261 Hevea brasiliensis Species 0.000 description 11
- 229920003052 natural elastomer Polymers 0.000 description 11
- 229920001194 natural rubber Polymers 0.000 description 11
- 239000005062 Polybutadiene Substances 0.000 description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 10
- 230000003078 antioxidant effect Effects 0.000 description 10
- 229920002857 polybutadiene Polymers 0.000 description 10
- 229910052717 sulfur Inorganic materials 0.000 description 10
- 239000011593 sulfur Substances 0.000 description 10
- CBXRMKZFYQISIV-UHFFFAOYSA-N 1-n,1-n,1-n',1-n',2-n,2-n,2-n',2-n'-octamethylethene-1,1,2,2-tetramine Chemical compound CN(C)C(N(C)C)=C(N(C)C)N(C)C CBXRMKZFYQISIV-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- ZZMVLMVFYMGSMY-UHFFFAOYSA-N 4-n-(4-methylpentan-2-yl)-1-n-phenylbenzene-1,4-diamine Chemical compound C1=CC(NC(C)CC(C)C)=CC=C1NC1=CC=CC=C1 ZZMVLMVFYMGSMY-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229920003051 synthetic elastomer Polymers 0.000 description 3
- 239000005061 synthetic rubber Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229920003211 cis-1,4-polyisoprene Polymers 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000004649 discoloration prevention Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- -1 polyoxyethylene Polymers 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- WBHHMMIMDMUBKC-XLNAKTSKSA-N ricinelaidic acid Chemical compound CCCCCC[C@@H](O)C\C=C\CCCCCCCC(O)=O WBHHMMIMDMUBKC-XLNAKTSKSA-N 0.000 description 1
- 229960003656 ricinoleic acid Drugs 0.000 description 1
- FEUQNCSVHBHROZ-UHFFFAOYSA-N ricinoleic acid Natural products CCCCCCC(O[Si](C)(C)C)CC=CCCCCCCCC(=O)OC FEUQNCSVHBHROZ-UHFFFAOYSA-N 0.000 description 1
- 238000010074 rubber mixing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 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
- C08L7/00—Compositions of natural rubber
-
- 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
-
- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application provides a rubber composition for preventing discoloration and a tire prepared from the rubber composition, wherein the rubber composition comprises the following components in parts by mass: 100 parts of diene rubber, 25-150 parts of filling reinforcing agent, 1-50 parts of plasticizer, 0-15 parts of silane coupling agent and 2-8 parts of zinc oxide; 1-5 parts of stearic acid; 1.5-8 parts of chemical anti-aging agent, 1-8 parts of protective wax, 0.1-20 parts of castor oil, 0.1-15 parts of wax crystal improver, 2-9 parts of vulcanizing agent and vulcanization accelerator. Compared with the prior art, the castor oil and the wax crystal improver are introduced into the rubber composition, so that the ozone aging resistance can be effectively prevented from being lost due to discoloration caused by the amine anti-aging agent and the protective wax, and the good appearance of the tire can be maintained.
Description
Technical Field
The invention belongs to the field of tire rubber products, and particularly relates to a rubber composition for preventing discoloration and a tire prepared from the rubber composition.
Background
Rubber compositions for tire sidewalls, which are generally made of natural rubber or diene-based synthetic rubber, undergo deterioration in the presence of hot oxygen and/or ozone, resulting in surface cracking and destruction thereof. In order to prevent the generation and expansion of cracks in such rubber compositions caused by oxidation, an amine-based antioxidant such as N- (1, 3-dimethylbutyl) -N' -phenyl-p-phenylenediamine (6PPD) or the like is added as a chemical antioxidant; in order to prevent static ozone aging, a physical protective wax is added to form a protective film on the surface of the rubber product.
Although the above-mentioned amine-based antioxidants and protective waxes are effective in preventing the generation and propagation of cracks in the presence of hot oxygen and/or ozone, these components migrate to the surface of rubber products, particularly the surface of tires, and discolor the rubber products during storage thereof or upon use to deteriorate the appearance of these rubber products. Wherein the protective wax migrates to the surface of the rubber product, and the surface becomes white; the amine anti-aging agent migrates to the surface of the rubber product, and the surface can become brown. The tire should be initially black due to carbon black filling, while the sidewall turns reddish brown resulting in severe color differences in appearance.
In view of these circumstances, some technical means have been adopted in the prior art, for example, a bluing agent is added to rubber to neutralize discoloration caused by an antioxidant; or a polyoxyethylene alcohol type nonionic surfactant is introduced into the rubber composition for a tire sidewall to prevent discoloration caused by an amine type antioxidant and a protective wax. However, according to these techniques, discoloration of the rubber composition for a sidewall cannot be sufficiently prevented, or the ozone aging resistance of the rubber composition is impaired.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to prevent discoloration of rubber compositions due to amine antioxidants and protective waxes without losing ozone aging resistance.
Disclosure of Invention
In view of the technical problems in the prior art, the present application provides a discoloration-preventing rubber composition to prevent discoloration caused by amine-based antioxidants and protective waxes without losing ozone aging resistance of the rubber composition. The rubber composition comprises the following components in parts by mass: 100 parts of diene rubber, 25-150 parts of filling reinforcing agent, 1-50 parts of plasticizer, 0-15 parts of silane coupling agent, 2-8 parts of zinc oxide, 1-5 parts of stearic acid, 1.5-8 parts of chemical anti-aging agent, 1-8 parts of protective wax, 0.1-20 parts of castor oil, 0.1-15 parts of wax crystal improver, 2-9 parts of vulcanizing agent and vulcanization accelerator.
Preferably, the rubber composition comprises the following components in parts by mass: 100 parts of diene rubber, 35-120 parts of filling reinforcing agent, 5-45 parts of plasticizer, 0-12 parts of silane coupling agent, 2.5-6 parts of zinc oxide, 1.5-4 parts of stearic acid, 2-8 parts of chemical anti-aging agent, 1-6 parts of protective wax, 0.1-10 parts of castor oil, 0.1-8 parts of wax crystal modifier, 2-7 parts of vulcanizing agent and vulcanization accelerator.
Preferably, the filling reinforcing agent comprises carbon black or white carbon black.
Preferably, the carbon black is one or a mixture of several of N100, N200, N300, N500 and N600 series carbon blacks.
Preferably, the white carbon black is precipitated white carbon black, and the nitrogen adsorption specific surface area NSA of the precipitated white carbon black is 85-200 m2/g。
Preferably, the plasticizer is one or a mixture of more of environment-friendly aromatic oil, environment-friendly alkane oil and environment-friendly naphthenic oil;
preferably, the wax crystal modifier is one or a mixture of more of maleic anhydride copolymer, polybetaine and polymethyl methacrylate.
Accordingly, the present application also provides a pneumatic tire prepared using the rubber composition described above.
The application provides a rubber composition for preventing discoloration and a tire prepared from the rubber composition, wherein the rubber composition comprises the following components in parts by mass: 100 parts of diene rubber, 25-150 parts of filling reinforcing agent, 1-50 parts of plasticizer, 0-15 parts of silane coupling agent and 2-8 parts of zinc oxide; 1-5 parts of stearic acid; 1.5-8 parts of chemical anti-aging agent, 1-8 parts of protective wax, 0.1-20 parts of castor oil, 0.1-15 parts of wax crystal improver, 2-9 parts of vulcanizing agent and vulcanization accelerator. Compared with the prior art, the castor oil and the wax crystal improver are introduced into the rubber composition, so that the ozone aging resistance can be effectively prevented from being lost due to discoloration caused by the amine anti-aging agent and the protective wax, and the good appearance of the tire can be maintained.
Detailed Description
In view of the technical problems in the prior art, the present application provides a discoloration prevention rubber composition comprising, in parts by mass: 100 parts of diene rubber, 25-150 parts of filling reinforcing agent, 1-50 parts of plasticizer, 0-15 parts of silane coupling agent, 2-8 parts of zinc oxide, 1-5 parts of stearic acid, 1.5-8 parts of chemical anti-aging agent, 1-8 parts of protective wax, 0.1-20 parts of castor oil, 0.1-15 parts of wax crystal improver, 2-9 parts of vulcanizing agent and vulcanization accelerator.
Wherein the diene rubber comprises natural rubber, butadiene rubber and other synthetic rubbers; the natural rubber is a natural high molecular compound taking cis-1, 4-polyisoprene as a main component, and 91-94 percent of the natural rubber is rubber hydrocarbon (cis-1, 4-polyisoprene), and the rest is non-rubber substances such as protein, fatty acid, ash, saccharides and the like; butadiene rubber is a synthetic rubber obtained by polymerizing butadiene, and is also called butadiene rubber. The castor oil is a composite triglyceride, and comprises the following components: 80% to 85% ricinoleic acid, 7% oleic acid, 3% linoleic acid, 2% palmitic acid, 1% stearic acid, flammable but not flammable, soluble in ethanol, slightly soluble in aliphatic hydrocarbons, practically insoluble in water and slightly volatile.
According to the application, the castor oil and the wax crystal improver are introduced into the rubber composition, so that the discoloration caused by the amine anti-aging agent and the protective wax can be effectively prevented, the ozone aging resistance can not be lost, and the good appearance of the tire can be maintained.
In order to ensure good performance of the rubber composition, in a preferred embodiment of the present application, the rubber composition comprises, in parts by mass: 100 parts of diene rubber, 35-120 parts of filling reinforcing agent, 5-45 parts of plasticizer, 0-12 parts of silane coupling agent, 2.5-6 parts of zinc oxide, 1.5-4 parts of stearic acid, 2-8 parts of chemical anti-aging agent, 1-6 parts of protective wax, 0.1-10 parts of castor oil, 0.1-8 parts of wax crystal modifier, 2-7 parts of vulcanizing agent and vulcanization accelerator.
In a preferred embodiment of the present application, the filler reinforcement includes carbon black or white carbon. The carbon black is preferably one or a mixture of several of N100, N200, N300, N500 and N600 series carbon blacks.
The white carbon black is preferably precipitated white carbon black, and the nitrogen adsorption specific surface area NSA of the precipitated white carbon black is 85-200 m2/g。
In a preferred embodiment of the application, the plasticizer is one or a mixture of more of environment-friendly aromatic oil, environment-friendly alkane oil and environment-friendly naphthenic oil.
In a preferred embodiment of the application, the wax crystal modifier is one or a mixture of more of maleic anhydride copolymer, polybetaine and polymethyl methacrylate.
The rubber compositions provided herein are cured using a sulfur cure system and the compounding of the rubber compositions is typically carried out in at least two stages, at least one non-productive compounding stage and one productive compounding stage, of the components. The filler material is mixed with the rubber in one or more non-productive mixing stages, which may be accomplished using methods known to those skilled in the art of rubber mixing and will not be described further herein.
In the following, the technical solutions in the present application will be further described clearly and completely with reference to specific embodiments, and it is obvious that the described embodiments are some, but not all embodiments of the present application. 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 application.
Example 1
A rubber composition comprises the following components in parts by mass: 50 parts of natural rubber, 50 parts of butadiene rubber, 55 parts of carbon black N330, 5 parts of environment-friendly aromatic oil TDAE, 0.5 part of castor oil, 3.5 parts of anti-aging agent 4020, 1.5 parts of anti-aging agent RD, 2 parts of protective wax 3241H, 2 parts of stearic acid, 3 parts of zinc oxide, 0.6 part of accelerator NS and 1.6 parts of sulfur.
Example 2
A rubber composition comprises the following components in parts by mass: 50 parts of natural rubber, 50 parts of butadiene rubber, 55 parts of carbon black N330, 5 parts of environment-friendly aromatic oil TDAE, 2 parts of castor oil, 3.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 2 parts of protective wax 3241H, 2 parts of stearic acid, 3 parts of zinc oxide, 0.6 part of accelerator NS and 1.6 parts of sulfur.
Example 3
A rubber composition comprises the following components in parts by mass: 50 parts of natural rubber, 50 parts of butadiene rubber, 55 parts of carbon black N330, 5 parts of environment-friendly aromatic oil TDAE, 2 parts of castor oil, 3.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 3 parts of maleic anhydride copolymer, 2 parts of protective wax 3241H, 2 parts of stearic acid, 3 parts of zinc oxide, 0.6 part of accelerator NS and 1.6 parts of sulfur.
Example 4
A rubber composition comprises the following components in parts by mass: 50 parts of natural rubber, 50 parts of butadiene rubber, 55 parts of carbon black N330, 5 parts of environment-friendly aromatic oil TDAE, 2 parts of castor oil, 3.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 3 parts of polybetaine, 2 parts of protective wax 3241H, 2 parts of stearic acid, 3 parts of zinc oxide, 0.6 part of accelerator NS and 1.6 parts of sulfur.
Example 5
A rubber composition comprises the following components in parts by mass: 50 parts of natural rubber, 50 parts of butadiene rubber, 55 parts of carbon black N330, 5 parts of environment-friendly aromatic oil TDAE, 2 parts of castor oil, 3.5 parts of antioxidant 4020, 1.5 parts of antioxidant RD, 3 parts of polymethyl methacrylate, 2 parts of protective wax 3241H, 2 parts of stearic acid, 3 parts of zinc oxide, 0.6 part of accelerator NS and 1.6 parts of sulfur.
Comparative example 1
A rubber composition comprises the following components in parts by mass: 50 parts of natural rubber, 50 parts of butadiene rubber, 55 parts of carbon black N330, 5 parts of environment-friendly aromatic oil TDAE, 3.5 parts of anti-aging agent 4020, 1.5 parts of anti-aging agent RD, 2 parts of protective wax 3241H, 2 parts of stearic acid, 3 parts of zinc oxide, 0.6 part of accelerator NS and 1.6 parts of sulfur.
Comparative example 2
A rubber composition comprises the following components in parts by mass: 50 parts of natural rubber, 50 parts of butadiene rubber, 55 parts of carbon black N330, 5 parts of environment-friendly aromatic oil TDAE, 2 parts of stearic acid, 3 parts of zinc oxide, 0.6 part of accelerator NS and 1.6 parts of sulfur.
The rubber compositions of examples 1 to 5 and comparative examples 1 to 2 were kneaded. Specifically, the raw materials other than sulfur and the vulcanization accelerator were mixed for 5 minutes in a 1.7-liter internal mixer, and then the sulfur and the vulcanization accelerator were added and mixed in an open mill. The vulcanization was carried out at 151 ℃ for 30 minutes in a plate vulcanizer to obtain a vulcanized rubber sheet having a thickness of 2 mm. The resulting vulcanized rubber sheet was used in the following experiments.
(tensile test)
The tensile strength at break (MPa) and elongation at break EB (%) were measured using a dumbbell type 1 cutter following the GB528 test method.
(ozone resistance test)
Following ISO1431 test method, test conditions: 20% stretching, ozone concentration of 50+5pphm, temperature of 40 ℃ and time of 72 hours, and adopting dynamic aging conditions. After exposure, the samples were removed from the test cell and the cracking status was recorded based on the observations in table 1.
TABLE 1
(color change experiment)
The degree of discoloration of the ozone-aged sample was visually observed and evaluated in 5-point scale. The color change was more severe when the value was smaller, with 5 being in a black state (no change) and 1 being in a brown state (high degree of color change).
The results of the performance tests of the rubber compositions of examples 1 to 5 and comparative examples 1 to 2 are shown in Table 2.
TABLE 2
Comparative example 1 is a conventional diene rubber composition using an antioxidant and a protective wax.
Comparative example 2 is a diene rubber composition without using an antioxidant and a protective wax.
Example 1 castor oil was added on the basis of comparative example 1.
Example 2 the content of castor oil was increased over example 1.
Example 3 a wax crystal modifier-maleic anhydride copolymer was added in addition to example 2.
Example 4 a wax crystal modifier, polybetaine, was added to example 2.
Example 5 a wax crystal modifier, polymethyl methacrylate, was added to example 2.
The result shows that the castor oil and the wax crystal modifier can effectively solve the problem of brown discoloration of the rubber composition and can maintain higher physical property and ozone aging resistance of the rubber composition. Therefore, the technical scheme of the invention can effectively prevent the discoloration caused by the amine anti-aging agent and the protective wax without losing the ozone aging resistance and can keep the good appearance of the tire.
The above disclosure is only illustrative of the embodiments of the present invention, and is not intended to limit the present invention in any way, and any methods and materials similar or equivalent to those described herein can be used in the method of the present invention. The preferred embodiments and materials described herein are exemplary only, and the embodiments of the present application are not intended to be limited thereto, since modifications and variations of the disclosed embodiments may occur to those skilled in the art and are intended to be included within the scope of the appended claims. The above sequence numbers are for illustrative purposes only and do not represent the relative merits of the implementation scenario. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention, without departing from the technical solution of the present invention, still belong to the protection scope of the technical solution of the present invention.
Claims (8)
1. A rubber composition for preventing discoloration, characterized by comprising, in parts by mass: 100 parts of diene rubber, 25-150 parts of filling reinforcing agent, 1-50 parts of plasticizer, 0-15 parts of silane coupling agent, 2-8 parts of zinc oxide, 1-5 parts of stearic acid, 1.5-8 parts of chemical anti-aging agent, 1-8 parts of protective wax, 0.1-20 parts of castor oil, 0.1-15 parts of wax crystal improver, 2-9 parts of vulcanizing agent and vulcanization accelerator.
2. The rubber composition according to claim 1, comprising, in parts by mass: 100 parts of diene rubber, 35-120 parts of filling reinforcing agent, 5-45 parts of plasticizer, 0-12 parts of silane coupling agent, 2.5-6 parts of zinc oxide, 1.5-4 parts of stearic acid, 2-8 parts of chemical anti-aging agent, 1-6 parts of protective wax, 0.1-10 parts of castor oil, 0.1-8 parts of wax crystal modifier, 2-7 parts of vulcanizing agent and vulcanization accelerator.
3. The rubber composition of claim 1, wherein the filler reinforcing agent comprises carbon black or white carbon.
4. The rubber composition according to claim 3, wherein the carbon black is one or a mixture of several of N100, N200, N300, N500 and N600 series carbon blacks.
5. The rubber composition according to claim 3, wherein the silica is precipitated silica, and the precipitated silica has a nitrogen adsorption specific surface area NSA of 85 to 200m2/g。
6. The rubber composition according to claim 1, wherein the plasticizer is one or a mixture of more of environment-friendly aromatic oil, environment-friendly alkane oil and environment-friendly naphthenic oil.
7. The rubber composition as claimed in claim 1, wherein the wax crystal modifier is one or a mixture of maleic anhydride copolymer, polybetaine and polymethyl methacrylate.
8. A pneumatic tire produced using the rubber composition according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110121473.7A CN113004581A (en) | 2021-01-28 | 2021-01-28 | Rubber composition for preventing discoloration and tire prepared from rubber composition |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110121473.7A CN113004581A (en) | 2021-01-28 | 2021-01-28 | Rubber composition for preventing discoloration and tire prepared from rubber composition |
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| CN113004581A true CN113004581A (en) | 2021-06-22 |
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| CN202110121473.7A Pending CN113004581A (en) | 2021-01-28 | 2021-01-28 | Rubber composition for preventing discoloration and tire prepared from rubber composition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115584065A (en) * | 2022-09-21 | 2023-01-10 | 山东玲珑轮胎股份有限公司 | Sidewall rubber composition and tire prepared from same |
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