CN116640369A - Nitrile rubber composition and preparation method thereof - Google Patents
Nitrile rubber composition and preparation method thereof Download PDFInfo
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- CN116640369A CN116640369A CN202310742466.8A CN202310742466A CN116640369A CN 116640369 A CN116640369 A CN 116640369A CN 202310742466 A CN202310742466 A CN 202310742466A CN 116640369 A CN116640369 A CN 116640369A
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- 229920000459 Nitrile rubber Polymers 0.000 title claims abstract description 67
- 239000000203 mixture Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000004073 vulcanization Methods 0.000 claims abstract description 63
- 229920001971 elastomer Polymers 0.000 claims abstract description 51
- 239000005060 rubber Substances 0.000 claims abstract description 51
- 150000001875 compounds Chemical class 0.000 claims abstract description 38
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 37
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000002156 mixing Methods 0.000 claims abstract description 35
- 239000005011 phenolic resin Substances 0.000 claims abstract description 33
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 32
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000011593 sulfur Substances 0.000 claims abstract description 28
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 28
- 239000004014 plasticizer Substances 0.000 claims abstract description 24
- 229920006235 chlorinated polyethylene elastomer Polymers 0.000 claims abstract description 18
- 239000000945 filler Substances 0.000 claims abstract description 18
- 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 16
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 4
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 230000003712 anti-aging effect Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 15
- 239000006229 carbon black Substances 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- LZDOYVMSNJBLIM-UHFFFAOYSA-N 4-tert-butylphenol;formaldehyde Chemical compound O=C.CC(C)(C)C1=CC=C(O)C=C1 LZDOYVMSNJBLIM-UHFFFAOYSA-N 0.000 claims description 2
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 claims 1
- 239000000454 talc Substances 0.000 claims 1
- 229910052623 talc Inorganic materials 0.000 claims 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 7
- 239000011575 calcium Substances 0.000 description 7
- 229910052791 calcium Inorganic materials 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004709 Chlorinated polyethylene Substances 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- QZCLKYGREBVARF-UHFFFAOYSA-N Acetyl tributyl citrate Chemical compound CCCCOC(=O)CC(C(=O)OCCCC)(OC(C)=O)CC(=O)OCCCC QZCLKYGREBVARF-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-N hexanedioic acid Natural products OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Abstract
The invention discloses a nitrile rubber composition and a preparation method thereof, comprising the following steps: step S1: adding 70 parts by mass of nitrile rubber, 20-30 parts by mass of chlorinated polyethylene elastomer, 1-3 parts by mass of sulfur, 10-30 parts by mass of phenolic resin, 3-7 parts by mass of zinc oxide, 0.5-2 parts by mass of stearic acid, 30-80 parts by mass of filler, 3-10 parts by mass of antioxidant, 0-15 parts by mass of plasticizer and 0-4 parts by mass of vulcanization accelerator into an open mill for fully mixing to obtain first mixed rubber; step S2: standing the first rubber compound obtained in the step S1 for 10-20 hours, and then mixing again by using an open mill to obtain a second rubber compound; step S3: after the second rubber compound obtained in the step S2 is parked for 10 to 20 hours, the first vulcanization is carried out for 20 to 60 minutes by utilizing sulfur at the temperature of 150 to 160 ℃; step S4: and (3) carrying out secondary vulcanization on the rubber compound obtained in the step (S3) after primary vulcanization at 165-190 ℃ for 10-30 minutes by using phenolic resin, thereby obtaining the nitrile rubber composition.
Description
Technical Field
The invention relates to a nitrile rubber composition and a preparation method thereof.
Background
Nitrile rubber (NBR) is excellent in oil resistance, but has poor heat aging resistance, weather resistance and chemical stability due to the double bonds contained in the main chain of NBR. Chlorinated polyethylene (CM) is a random product of polyethylene produced by a chlorine substitution reaction, has aging resistance similar to PVC, and has excellent aging resistance. Therefore, many techniques for modifying nitrile rubber by using chlorinated polyethylene have appeared in the prior art, and by using both the techniques together, a modified nitrile rubber with good aging resistance can be obtained. However, most of the prior art adopts a single vulcanizing agent (such as sulfur) to vulcanize the blending rubber of chlorinated polyethylene and nitrile rubber, and the vulcanizing effect is still to be improved.
Disclosure of Invention
The invention aims to provide a nitrile rubber composition and a preparation method thereof, and the preparation method can lead the mixed rubber of chlorinated polyethylene and nitrile rubber to be vulcanized more fully, thereby obtaining the nitrile rubber composition with better performance.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a process for preparing a nitrile rubber composition comprising the steps of:
a first mixing step S1: adding 70 parts by mass of nitrile rubber, 20-30 parts by mass of chlorinated polyethylene elastomer, 1-3 parts by mass of sulfur, 10-30 parts by mass of phenolic resin, 3-7 parts by mass of zinc oxide, 0.5-2 parts by mass of stearic acid, 30-80 parts by mass of filler, 3-10 parts by mass of antioxidant, 0-15 parts by mass of plasticizer and 0-4 parts by mass of vulcanization accelerator into an open mill for fully mixing to obtain first mixed rubber;
and a second mixing step S2: standing the first rubber compound obtained in the step S1 for 10-20 hours, and then mixing again by using an open mill to obtain a second rubber compound;
a first vulcanization step S3: after the second rubber compound obtained in the step S2 is parked for 10 to 20 hours, sulfur is utilized to carry out primary vulcanization at the temperature of 150 to 160 ℃, and the primary vulcanization time is 20 to 60 minutes;
and a second vulcanization step S4: and (3) performing secondary vulcanization on the rubber compound obtained in the step (S3) after primary vulcanization at 165-190 ℃ by using phenolic resin, wherein the secondary vulcanization time is 10-30 minutes, so as to obtain the nitrile rubber composition.
Preferably, the phenolic resin is a thermoplastic phenolic resin or a thermosetting phenolic resin.
Preferably, the thermoplastic phenolic resin is 2123 phenolic resin (phenol formaldehyde resin); the thermosetting phenolic resin is 2402 phenolic resin (p-tertiary butyl phenol formaldehyde resin).
Preferably, the phenolic resin has a hydroxymethyl content of 8% or more.
Preferably, the filler is at least one of carbon black, white carbon black, light calcium carbonate or talcum powder, and the content of the filler is 50-80 parts by mass.
Preferably, the anti-aging agent is one or more of anti-aging agent 4020, anti-aging agent RD and anti-aging agent MBZ.
Preferably, the plasticizer is selected from one or more of polyether plasticizers, polyester plasticizers or adipic acid ether ester plasticizers.
Preferably, the vulcanization accelerator is one or more of accelerator TT, accelerator CBS, accelerator BZ, accelerator PZ and accelerator DPTT.
In addition, the invention also provides a nitrile rubber composition, which is prepared by the preparation method of any one of the above.
The beneficial effects of the invention are as follows:
according to the invention, two vulcanizing agents, namely sulfur and phenolic resin, are adopted to carry out twice temperature control vulcanization, each vulcanization can obtain a good vulcanization effect, and in a first vulcanization section with lower temperature, the sulfur plays a role in vulcanization, so that the nitrile rubber with even distribution of vulcanization bonds and high crosslinking density can be obtained; in the second vulcanization stage with higher temperature, the phenolic resin plays a role in vulcanization, so that the chlorinated polyethylene is fully vulcanized, and the finally modified nitrile rubber composition has higher mechanical properties such as strength, elongation and the like.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to specific embodiments.
Example 1:
a nitrile rubber composition consisting of the following components: the modified PVC material comprises, by mass, 70 parts of nitrile rubber, 20 parts of chlorinated polyethylene elastomer, 1 part of sulfur, 10 parts of phenolic resin, 3 parts of zinc oxide, 0.5 part of stearic acid, 30 parts of filler, 3 parts of anti-aging agent, 1 part of plasticizer, 1 part of vulcanization accelerator and 1 part of flow aid.
The nitrile rubber composition is prepared by the following method:
a first mixing step S1: adding 70 parts by mass of nitrile rubber, 20 parts by mass of chlorinated polyethylene elastomer, 1 part by mass of sulfur, 10 parts by mass of phenolic resin, 3 parts by mass of zinc oxide, 0.5 part by mass of stearic acid, 30 parts by mass of filler (comprising 20 parts by mass of carbon black and 10 parts by mass of light calcium), 3 parts by mass of anti-aging agent, 1 part by mass of plasticizer, 1 part by mass of vulcanization accelerator and 1 part by mass of flow aid into an open mill for fully mixing to obtain first mixed rubber;
and a second mixing step S2: standing the first rubber compound obtained in the step S1 for 10 hours, and then mixing again by using an open mill to obtain a second rubber compound;
a first vulcanization step S3: after the second rubber compound obtained in the step S2 is parked for 10 hours, sulfur is utilized to carry out first vulcanization at 150 ℃, and the first vulcanization time is 20 minutes;
and a second vulcanization step S4: and (3) performing secondary vulcanization on the rubber compound obtained in the step (S3) after primary vulcanization by using phenolic resin at 165 ℃ for 10 minutes, thereby obtaining the nitrile rubber composition.
Example 2:
a nitrile rubber composition consisting of the following components: the adhesive comprises, by mass, 70 parts of nitrile rubber, 30 parts of chlorinated polyethylene elastomer, 3 parts of sulfur, 30 parts of phenolic resin, 7 parts of zinc oxide, 2 parts of stearic acid, 80 parts of filler, 10 parts of an anti-aging agent, 15 parts of a plasticizer, 4 parts of a vulcanization accelerator and 1 part of a flow aid.
The nitrile rubber composition is prepared by the following method:
a first mixing step S1: adding 70 parts by mass of nitrile rubber, 30 parts by mass of chlorinated polyethylene elastomer, 3 parts by mass of sulfur, 30 parts by mass of phenolic resin, 7 parts by mass of zinc oxide, 2 parts by mass of stearic acid, 80 parts by mass of filler (comprising 50 parts by mass of carbon black and 30 parts by mass of light calcium), 10 parts by mass of antioxidant, 15 parts by mass of plasticizer, 4 parts by mass of vulcanization accelerator and 1 part by mass of flow aid into an open mill for fully mixing to obtain first mixed rubber;
and a second mixing step S2: after the first rubber compound obtained in the step S1 is parked for 20 hours, the second rubber compound is obtained by mixing the first rubber compound with an open mill;
a first vulcanization step S3: after the second rubber compound obtained in the step S2 is parked for 20 hours, the first vulcanization is carried out by utilizing sulfur at 160 ℃, and the first vulcanization time is 60 minutes;
and a second vulcanization step S4: and (3) performing secondary vulcanization on the rubber compound obtained in the step (S3) after the primary vulcanization by using phenolic resin at the temperature of 190 ℃ for 30 minutes, thereby obtaining the nitrile rubber composition.
Example 3:
a nitrile rubber composition consisting of the following components: the adhesive comprises, by mass, 70 parts of nitrile rubber, 25 parts of chlorinated polyethylene elastomer, 2 parts of sulfur, 20 parts of phenolic resin, 5 parts of zinc oxide, 1 part of stearic acid, 55 parts of filler, 6.5 parts of an anti-aging agent, 7.5 parts of a plasticizer, 2 parts of a vulcanization accelerator and 1 part of a flow aid.
The nitrile rubber composition is prepared by the following method:
a first mixing step S1: adding 70 parts by mass of nitrile rubber, 25 parts by mass of chlorinated polyethylene elastomer, 2 parts by mass of sulfur, 20 parts by mass of phenolic resin, 5 parts by mass of zinc oxide, 1 part by mass of stearic acid, 55 parts by mass of filler (comprising 30 parts by mass of carbon black and 25 parts by mass of light calcium), 6.5 parts by mass of anti-aging agent, 7.5 parts by mass of plasticizer, 2 parts by mass of vulcanization accelerator and 1 part by mass of flow aid into an open mill for fully mixing to obtain first mixed rubber;
and a second mixing step S2: after the first rubber compound obtained in the step S1 is parked for 15 hours, the second rubber compound is obtained by mixing the first rubber compound with an open mill;
a first vulcanization step S3: after the second rubber compound obtained in the step S2 is parked for 15 hours, sulfur is utilized to carry out first vulcanization at 155 ℃, and the first vulcanization time is 40 minutes;
and a second vulcanization step S4: and (3) performing secondary vulcanization on the rubber compound obtained in the step (S3) after primary vulcanization by using phenolic resin at 180 ℃ for 20 minutes, thereby obtaining the nitrile rubber composition.
Comparative example 1:
a nitrile rubber composition consisting of the following components: the rubber comprises, by mass, 70 parts of nitrile rubber, 20 parts of chlorinated polyethylene elastomer, 1 part of sulfur, 3 parts of zinc oxide, 0.5 part of stearic acid, 30 parts of filler, 3 parts of anti-aging agent, 1 part of plasticizer, 1 part of vulcanization accelerator and 1 part of flow aid.
The nitrile rubber composition is prepared by the following method:
a first mixing step S1: adding 70 parts by mass of nitrile rubber, 20 parts by mass of chlorinated polyethylene elastomer, 1 part by mass of sulfur, 3 parts by mass of zinc oxide, 0.5 part by mass of stearic acid, 30 parts by mass of filler (comprising 20 parts by mass of carbon black and 10 parts by mass of light calcium), 3 parts by mass of anti-aging agent, 1 part by mass of plasticizer, 1 part by mass of vulcanization accelerator and 1 part by mass of flow aid into an open mill for fully mixing to obtain first mixed rubber;
and a second mixing step S2: standing the first rubber compound obtained in the step S1 for 10 hours, and then mixing again by using an open mill to obtain a second rubber compound;
and (3) vulcanization: after the second rubber compound obtained in the step S2 is parked for 12 hours, it is vulcanized with sulfur at 150℃for 20 minutes, thereby obtaining the nitrile rubber composition.
Comparative example 2:
a nitrile rubber composition consisting of the following components: the rubber comprises, by mass, 70 parts of nitrile rubber, 30 parts of chlorinated polyethylene elastomer, 3 parts of sulfur, 7 parts of zinc oxide, 2 parts of stearic acid, 80 parts of filler, 10 parts of anti-aging agent, 15 parts of plasticizer, 4 parts of vulcanization accelerator and 1 part of flow aid.
The nitrile rubber composition is prepared by the following method:
a first mixing step S1: adding 70 parts by mass of nitrile rubber, 30 parts by mass of chlorinated polyethylene elastomer, 3 parts by mass of sulfur, 7 parts by mass of zinc oxide, 2 parts by mass of stearic acid, 80 parts by mass of filler (comprising 50 parts by mass of carbon black and 30 parts by mass of light calcium), 10 parts by mass of anti-aging agent, 15 parts by mass of plasticizer, 4 parts by mass of vulcanization accelerator and 1 part by mass of flow aid into an open mill for fully mixing to obtain first mixed rubber;
and a second mixing step S2: after the first rubber compound obtained in the step S1 is parked for 20 hours, the second rubber compound is obtained by mixing the first rubber compound with an open mill;
and (3) vulcanization: after the second rubber compound obtained in the step S2 is parked for 20 hours, it is vulcanized with sulfur at 160℃for 60 minutes, thereby obtaining the nitrile rubber composition.
Comparative example 3:
a nitrile rubber composition consisting of the following components: the rubber comprises, by mass, 70 parts of nitrile rubber, 25 parts of chlorinated polyethylene elastomer, 2 parts of sulfur, 5 parts of zinc oxide, 1 part of stearic acid, 55 parts of filler, 6.5 parts of anti-aging agent, 7.5 parts of plasticizer, 2 parts of vulcanization accelerator and 1 part of flow aid.
The nitrile rubber composition is prepared by the following method:
a first mixing step S1: adding 70 parts by mass of nitrile rubber, 25 parts by mass of chlorinated polyethylene elastomer, 2 parts by mass of sulfur, 5 parts by mass of zinc oxide, 1 part by mass of stearic acid, 55 parts by mass of filler (comprising 30 parts by mass of carbon black and 25 parts by mass of light calcium), 6.5 parts by mass of anti-aging agent, 7.5 parts by mass of plasticizer, 2 parts by mass of vulcanization accelerator and 1 part by mass of flow aid into an open mill for fully mixing to obtain first mixed rubber;
and a second mixing step S2: after the first rubber compound obtained in the step S1 is parked for 15 hours, the second rubber compound is obtained by mixing the first rubber compound with an open mill;
and (3) vulcanization: after the second rubber compound obtained in the step S2 was parked for 15 hours, it was vulcanized with sulfur at 155℃for 40 minutes, thereby obtaining the nitrile rubber composition.
The component brands of the above examples and comparative examples are respectively: nitrile butadiene rubber NBR, trade name 3352 (acrylonitrile mass fraction 0.33, mooney viscosity 52), product of Arrheniaceae, inc.; chlorinated polyethylene elastomer CM, trade mark 352MF, product of Hangzhou Kohly chemical Co., ltd; carbon black N774, a product of cabot corporation, usa; light calcium, a product of Fujian Sannong Co., ltd; plasticizer ATBC, a product of Qingdao blue sail chemical industry Co., ltd; zinc oxide, stearic acid, sulfur, an anti-aging agent, an accelerator TT, an accelerator CBS and a flow aid UF440 are all commercial products.
The nitrile rubber compositions obtained in the above examples and comparative examples were subjected to performance tests, the test results are shown in Table 1, in which the hardness was tested according to GB/T531.1-2008; tensile strength and elongation at break were tested according to GB/T528; compression set testing was performed in accordance with GB/T7759.
As can be seen from the above table, the nitrile rubber compositions of examples 1-3 perform better than the nitrile rubber compositions of comparative examples 1-3, indicating that the compounds of the present invention have good physical and mechanical properties.
Finally, it is necessary to point out that: the above embodiments are merely further illustrative of the present invention and should not be construed as limiting the scope of the present invention, and some insubstantial modifications and improvements made by those skilled in the art in light of the above disclosure are intended to fall within the scope of the present invention.
Claims (9)
1. A process for the preparation of a nitrile rubber composition comprising the steps of:
a first mixing step S1: adding 70 parts by mass of nitrile rubber, 20-30 parts by mass of chlorinated polyethylene elastomer, 1-3 parts by mass of sulfur, 10-30 parts by mass of phenolic resin, 3-7 parts by mass of zinc oxide, 0.5-2 parts by mass of stearic acid, 30-80 parts by mass of filler, 3-10 parts by mass of antioxidant, 0-15 parts by mass of plasticizer and 0-4 parts by mass of vulcanization accelerator into an open mill for fully mixing to obtain first mixed rubber;
and a second mixing step S2: standing the first rubber compound obtained in the step S1 for 10-20 hours, and then mixing again by using an open mill to obtain a second rubber compound;
a first vulcanization step S3: after the second rubber compound obtained in the step S2 is parked for 10 to 20 hours, sulfur is utilized to carry out primary vulcanization at the temperature of 150 to 160 ℃, and the primary vulcanization time is 20 to 60 minutes;
and a second vulcanization step S4: and (3) performing secondary vulcanization on the rubber compound obtained in the step (S3) after primary vulcanization at 165-190 ℃ by using phenolic resin, wherein the secondary vulcanization time is 10-30 minutes, so as to obtain the nitrile rubber composition.
2. The method for preparing nitrile rubber composition according to claim 1, wherein the phenolic resin is a thermoplastic phenolic resin or a thermosetting phenolic resin.
3. The method of preparing nitrile rubber composition according to claim 1, wherein the thermoplastic phenolic resin is 2123 phenolic resin (phenol formaldehyde resin); the thermosetting phenolic resin is 2402 phenolic resin (p-tertiary butyl phenol formaldehyde resin).
4. The method for preparing a nitrile rubber composition according to claim 1, wherein the phenolic resin has a hydroxymethyl content of 8% or more.
5. The method for producing a nitrile rubber composition according to claim 1, wherein the filler is at least one of carbon black, white carbon black, light calcium carbonate and talc in an amount of 50 to 80 parts by mass.
6. The method for preparing the nitrile rubber composition according to claim 1, wherein the anti-aging agent is one or more of anti-aging agent 4020, anti-aging agent RD and anti-aging agent MBZ.
7. The method of preparing a nitrile rubber composition according to claim 1, wherein the plasticizer is one or more selected from the group consisting of polyether plasticizers, polyester plasticizers and adipate plasticizers.
8. The method for preparing the nitrile rubber composition according to claim 1, wherein the vulcanization accelerator is one or more of accelerator TT, accelerator CBS, accelerator BZ, accelerator PZ and accelerator DPTT.
9. A nitrile rubber composition, characterized in that it is prepared by the preparation method according to any one of claims 1 to 8.
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| CN202310742466.8A CN116640369A (en) | 2023-06-21 | 2023-06-21 | Nitrile rubber composition and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310742466.8A CN116640369A (en) | 2023-06-21 | 2023-06-21 | Nitrile rubber composition and preparation method thereof |
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| CN116640369A true CN116640369A (en) | 2023-08-25 |
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