CN113652017A - Heat-resistant and high-strength rubber product and preparation method thereof - Google Patents
Heat-resistant and high-strength rubber product and preparation method thereof Download PDFInfo
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- CN113652017A CN113652017A CN202010397880.6A CN202010397880A CN113652017A CN 113652017 A CN113652017 A CN 113652017A CN 202010397880 A CN202010397880 A CN 202010397880A CN 113652017 A CN113652017 A CN 113652017A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 108
- 239000005060 rubber Substances 0.000 title claims abstract description 108
- 238000002360 preparation method Methods 0.000 title description 14
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 63
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 38
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- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000008117 stearic acid Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000004073 vulcanization Methods 0.000 claims description 17
- 238000003801 milling Methods 0.000 claims description 15
- 230000035484 reaction time Effects 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 9
- 239000004593 Epoxy Substances 0.000 claims description 8
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- 239000002600 sunflower oil Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- ZVFDTKUVRCTHQE-UHFFFAOYSA-N Diisodecyl phthalate Chemical compound CC(C)CCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC(C)C ZVFDTKUVRCTHQE-UHFFFAOYSA-N 0.000 claims description 6
- 230000002687 intercalation Effects 0.000 claims description 6
- 238000009830 intercalation Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000006082 mold release agent Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 3
- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical group [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 claims description 3
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- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical group CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 claims description 3
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
- C08L15/005—Hydrogenated nitrile rubber
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- 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
-
- 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
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a heat-resistant and high-strength rubber product which comprises the following raw materials in parts by mass: 100-120 parts of nitrile rubber, 40-60 parts of PVC resin, 1-3 parts of stabilizer, 1-2 parts of stearic acid, 30-40 parts of reinforcing agent, 5-8 parts of plasticizer, 1-3 parts of vulcanizing agent, 3-6 parts of rubber accelerator and 2-8 parts of anti-aging agent; wherein the reinforcing agent is prepared from (8-12) by mass: (10-15): (2-5) a mixture of carbon black, nano white carbon black and hydrophobic silica, wherein the particle size of the hydrophobic silica is 10-20 nm. The rubber product has the advantages of wide service temperature range, high temperature resistance, high strength, good wear resistance, high compression deformation resistance and long service life, and can be used for preparing rubber sealing rings and rubber damping parts.
Description
Technical Field
The invention relates to the technical field of rubber materials, in particular to a heat-resistant high-strength rubber product and a preparation method thereof.
Background
The rubber is a high-elasticity polymer material with reversible deformation, is rich in elasticity at room temperature, can generate large deformation under the action of small external force, and can recover the original shape after the external force is removed. The rubber can be divided into natural rubber and synthetic rubber, the natural rubber is prepared by extracting colloid from plants such as rubber trees, rubber grasses and the like and then processing, the synthetic rubber is obtained by polymerizing various monomers, and the natural rubber and the synthetic rubber have a plurality of applications and products, such as sealing rings, shock absorbing parts, tires and the like, and become important economic products.
Synthetic rubber is also called synthetic elastomer, is a high-elasticity polymer synthesized artificially, has a long development history and has wide application prospect. However, the existing synthetic rubber product has low strength, poor compression deformation resistance, large deformation under high load and easy fatigue damage, in the prior art, the strength and wear resistance of the synthetic rubber product are usually enhanced by filling carbon black, but the combination between the carbon black and a rubber system is weak, so that the powder falling phenomenon can occur in use, the function of the synthetic rubber product fails in advance, and the service life is short; in addition, the heat resistance of the existing synthetic rubber product is poor, and when the synthetic rubber product is applied to an environment with higher temperature, the aging of rubber parts is easily caused, the mechanical property of the aged rubber parts is reduced, the rubber parts lose efficacy, and the normal use is influenced.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a heat-resistant high-strength rubber product which has a wider use temperature range, high temperature resistance, high strength, good wear resistance, high compression deformation resistance and longer service life, and can be used for preparing rubber sealing rings and rubber shock absorbing parts. In addition, the invention also provides a preparation method of the heat-resistant and high-strength rubber product.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a heat-resistant and high-strength rubber product, which comprises the following raw materials in parts by mass: 100-120 parts of nitrile rubber, 40-60 parts of PVC resin, 1-3 parts of stabilizer, 1-2 parts of stearic acid, 30-40 parts of reinforcing agent, 5-8 parts of plasticizer, 1-3 parts of vulcanizing agent, 3-6 parts of rubber accelerator and 2-8 parts of anti-aging agent;
wherein the reinforcing agent is prepared from (8-12) by mass: (10-15): (2-5) a mixture of carbon black, nano white carbon black and hydrophobic silica, wherein the particle size of the hydrophobic silica is 10-20 nm.
In the invention, a part of carbon black is replaced by nano white carbon black and hydrophobic silicon dioxide, the nano white carbon black has smaller particle size, is mixed with other materials for chemical crosslinking, is uniformly distributed in a network structure of rubber molecules, has stronger acting force with a rubber matrix, and does not have the powder falling phenomenon when in use; the hydrophobic silicon dioxide has larger surface energy, has polarity with the rubber matrix, better compatibility and better reinforcing and wear-resisting properties; the two are matched with carbon black for use, so that the rubber product has higher reinforcing wear resistance, the tensile strength and the elongation at break of the rubber product can be improved, and the service life of the product is prolonged.
Preferably, the nitrile rubber is modified hydrogenated nitrile rubber, and the modified hydrogenated nitrile rubber is hydrogenated nitrile rubber modified by organic rectorite.
Preferably, the preparation process of the modified hydrogenated nitrile rubber is as follows:
(1) adding 80-100 parts by mass of hydrogenated nitrile rubber and 10-15 parts by mass of organic rectorite into a reaction vessel for carrying out melting intercalation treatment, wherein the temperature is 120-;
(2) and (2) adding the mixture obtained in the step (1) into an open mill for open milling and forming, wherein the open milling and forming temperature is 50-60 ℃, and the reaction time is 30-60min, so as to obtain the modified hydrogenated nitrile rubber.
Hydrogenated nitrile rubber is a saturated oil-resistant rubber, can still maintain physical and mechanical properties equivalent to normal temperature at high temperature, and has good oil resistance and wear resistance, but the production process of the hydrogenated nitrile rubber is complex and the price is expensive. According to the invention, the hydrogenated nitrile rubber is modified by adopting the organic rectorite, the organic rectorite is a phyllosilicate, has a larger length-diameter ratio, can be uniformly dispersed in a rubber matrix in a nano lamellar structure, the nano dispersed organic rectorite can reduce the using amount of the hydrogenated nitrile rubber, reduces the cost, has an obvious reinforcing effect on the rubber matrix, has a synergistic effect with a reinforcing agent, can further improve the mechanical property and the wear resistance of a rubber product, and has a certain barrier effect, so that the flame retardance, the oil resistance and the thermal stability of the rubber product are improved.
Preferably, the mould release agent also comprises 1-2 parts of alkyl phosphate. And by adding the release agent, the processing and forming performances of the rubber product are improved.
Preferably, the plasticizer is prepared from the following components in a mass ratio of (10-20): (4-8) a mixture of diisodecyl phthalate and epoxy sunflower oil. According to the invention, the epoxy sunflower oil is added into the plasticizer, so that the flexibility of the rubber product is effectively improved, and meanwhile, in the use process of the rubber product, the epoxy sunflower oil can continuously seep out, so that a layer of oil film is generated on the surface of the rubber product, and when the rubber product is applied to the sealing field such as a sealing ring, the generated oil film can improve the sealing performance of a sealing element and reduce the surface abrasion of the rubber product.
Preferably, the vulcanizing agent is sulfur, the rubber accelerator is tetramethylthiuram disulfide, the stabilizer is a calcium-zinc stabilizer, and the anti-aging agent is anti-aging agent RD, anti-aging agent 4020, anti-aging agent HS-911 or antioxidant 1010.
Through the action of the stabilizer, the synthetic rubber product has good corrosion resistance, tear resistance and elasticity, and cracks are prevented from occurring in the synthetic rubber product in use; the rubber accelerator promotes the reaction of rubber, and the anti-aging agent can prevent the rubber product from aging and wearing in use, thereby prolonging the service life of the rubber product.
In a second aspect of the present invention, there is provided a method for preparing the heat-resistant high-strength rubber product, comprising the following steps:
s1, adding the nitrile rubber and the PVC resin into an internal mixer, internally mixing for 10-15min at 70-80 ℃, then adding the reinforcing agent and the plasticizer, heating to 85-90 ℃, and continuously internally mixing for 20-30min to obtain rubber compound;
s2, adding the rubber compound into an open mill, adding a stabilizer, stearic acid, a vulcanizing agent, a rubber accelerator and an anti-aging agent into the rubber compound, and carrying out open milling molding at the temperature of 60-70 ℃ to obtain a molded part;
and S3, sequentially carrying out primary vulcanization treatment and secondary vulcanization treatment on the obtained formed piece, and discharging to obtain the heat-resistant and high-strength rubber product.
In the preparation process of the rubber product, the dynamic crosslinking is carried out in the internal mixer, and the two-stage temperature rise is adopted in the internal mixer, so that the auxiliary materials can be more uniformly dispersed in a continuous rubber phase and a more uniformly dispersed mixed material can be obtained compared with the constant-temperature mixing process directly in the internal mixer in the prior art, and the comprehensive performance of the finally obtained rubber product is improved.
Preferably, the primary vulcanization is carried out in a press vulcanizer, and the specific conditions of the primary vulcanization treatment are as follows: vulcanizing at 170 deg.C and 190MPa for 30-40 min; the secondary vulcanization is carried out in an oven, and the specific conditions of the secondary vulcanization treatment are as follows: vulcanizing at 180 deg.C and 200MPa for 4-6 h.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the nitrile rubber and the PVC resin are used as matrix materials, and other raw material components of the reinforcing agent are matched, so that the prepared rubber product has high strength, wide use temperature range and high temperature resistance and compression deformation resistance; the carbon black, the nano white carbon black and the hydrophobic silica in the reinforcing agent are mutually matched to provide a high-efficiency reinforcing and wear-resisting effect for the rubber product, the acting force between the reinforcing agent and the rubber substrate is stronger, the powder falling phenomenon cannot occur in use, and the service life of the rubber product is prolonged; by selecting the hydrogenated nitrile rubber modified by organic rectorite, the nano-dispersed organic rectorite can reduce the using amount of the hydrogenated nitrile rubber, reduce the cost, simultaneously have obvious reinforcing effect on a rubber matrix, and can further improve the mechanical property and the wear resistance of a rubber product by the synergistic effect of the reinforcing agent and the reinforcing agent. Through test tests, the hardness of the prepared rubber product reaches 74.8-76.5, the tensile strength reaches 38-42MPa, the elongation at break is 240-280%, and the anti-aging performance is excellent.
Drawings
The invention is described in further detail below with reference to specific embodiments and with reference to the following drawings.
FIG. 1 is a flow chart of a process for preparing modified hydrogenated nitrile rubber in accordance with the present invention;
FIG. 2 is a flow chart of a process for preparing a rubber article according to the present invention;
FIG. 3 is a graph showing the change in tensile strength of rubber articles obtained in examples 1 to 4 and comparative examples 1 to 3 according to the present invention;
FIG. 4 is a graph showing the change in elongation at break of rubber articles obtained in examples 1 to 4 and comparative examples 1 to 3 according to the present invention;
FIG. 5 is a graph showing changes in hardness of rubber articles obtained in examples 1 to 4 and comparative examples 1 to 3 according to the present invention;
FIG. 6 is a graph showing the variation of the anti-aging property parameters of the rubber articles obtained in examples 1 to 4 and comparative examples 1 to 3 according to the present invention.
Detailed Description
Example 1
A heat-resistant high-strength rubber product comprises the following raw materials: 108Kg of nitrile rubber, 42Kg of PVC resin, 1Kg of stabilizer, 1.8Kg of stearic acid, 36Kg of reinforcing agent, 6Kg of plasticizer, 1.8Kg of vulcanizing agent, 5Kg of rubber accelerator and 4Kg of anti-aging agent;
in the formula, the reinforcing agent is prepared from the following components in a mass ratio of 9: 12: 5, the particle size of the hydrophobic silicon dioxide is 10-20 nm; the mass ratio of the plasticizer is 7: 2 a mixture of diisodecyl phthalate and epoxy sunflower oil; the vulcanizing agent is sulfur, the rubber accelerator is tetramethyl thiuram disulfide, the stabilizer is a calcium-zinc stabilizer, and the anti-aging agent is an anti-aging agent RD.
The nitrile rubber is modified hydrogenated nitrile rubber, and the modified hydrogenated nitrile rubber is hydrogenated nitrile rubber modified by organic rectorite, and as shown in figure 1, the preparation process is as follows:
(1) adding 184Kg of hydrogenated nitrile rubber and 20Kg of organic rectorite into a reaction vessel for melt intercalation treatment, wherein the temperature is 120 ℃, the rotating speed is 40r/min, and the reaction time is 20min, so as to obtain a mixture;
(2) and (2) adding the mixture obtained in the step (1) into an open mill for open milling forming, wherein the open milling forming temperature is 50 ℃, and the reaction time is 40min, so as to obtain the modified hydrogenated nitrile rubber.
The preparation method of the heat-resistant and high-strength rubber product, as shown in figure 2, comprises the following steps:
s1, adding the nitrile rubber and the PVC resin into an internal mixer, internally mixing for 10-15min at 70-80 ℃, then adding the reinforcing agent and the plasticizer, heating to 85-90 ℃, and continuously internally mixing for 20-30min to obtain rubber compound;
s2, adding the rubber compound into an open mill, adding a stabilizer, stearic acid, a vulcanizing agent, a rubber accelerator and an anti-aging agent into the rubber compound, and carrying out open milling molding at the temperature of 60-70 ℃ to obtain a molded part;
s3, sequentially carrying out primary vulcanization treatment and secondary vulcanization treatment on the obtained formed piece, and then discharging to obtain a heat-resistant and high-strength rubber product;
wherein, the primary vulcanization is carried out in a plate vulcanizing machine, and the specific conditions of the primary vulcanization treatment are as follows: vulcanizing at 170 deg.C and 190MPa for 30-40 min; the secondary vulcanization is carried out in an oven, and the specific conditions of the secondary vulcanization treatment are as follows: vulcanizing at 180 deg.C and 200MPa for 4-6 h.
Example 2
A heat-resistant high-strength rubber product comprises the following raw materials: 100Kg of nitrile rubber, 54Kg of PVC resin, 1.8Kg of stabilizer, 1.4Kg of stearic acid, 30Kg of reinforcing agent, 8Kg of plasticizer, 1Kg of vulcanizing agent, 3Kg of rubber accelerator, 2Kg of anti-aging agent and 1Kg of mold release agent;
in the formula, the reinforcing agent is prepared from the following components in a mass ratio of 8: 10: 2, the particle size of the hydrophobic silicon dioxide is 10-20 nm; the release agent is alkyl phosphate; the mass ratio of the plasticizer is 5: 3 a mixture of diisodecyl phthalate and epoxy sunflower oil; the anti-aging agent is antioxidant 1010, and the other components are the same as in example 1.
The nitrile rubber is modified hydrogenated nitrile rubber, and the modified hydrogenated nitrile rubber is hydrogenated nitrile rubber modified by organic rectorite, and as shown in figure 1, the preparation process is as follows:
(1) adding 160Kg of hydrogenated nitrile rubber and 24Kg of organic rectorite into a reaction vessel for melt intercalation treatment, wherein the temperature is 140 ℃, the rotating speed is 30r/min, and the reaction time is 10min, so as to obtain a mixture;
(2) and (2) adding the mixture obtained in the step (1) into an open mill for open milling and forming, wherein the open milling and forming temperature is 60 ℃, and the reaction time is 30min, so as to obtain the modified hydrogenated nitrile rubber.
The preparation method of the heat-resistant and high-strength rubber product can refer to example 1.
Example 3
A heat-resistant high-strength rubber product comprises the following raw materials: 112Kg of nitrile rubber, 60Kg of PVC resin, 2.6Kg of stabilizer, 2Kg of stearic acid, 40Kg of reinforcing agent, 5Kg of plasticizer, 2Kg of vulcanizing agent, 6Kg of rubber accelerator, 8Kg of anti-aging agent and 2Kg of mold release agent;
in the formula, the reinforcing agent is prepared from the following components in a mass ratio of 10: 12: 4, the particle size of the hydrophobic silicon dioxide is 10-20 nm; the mass ratio of the plasticizer is 5: 2 a mixture of diisodecyl phthalate and epoxy sunflower oil; the anti-aging agent is anti-aging agent 4020, and the rest components are the same as those in example 1.
The nitrile rubber is modified hydrogenated nitrile rubber, and the modified hydrogenated nitrile rubber is hydrogenated nitrile rubber modified by organic rectorite, and as shown in figure 1, the preparation process is as follows:
(1) adding 200Kg of hydrogenated nitrile rubber and 30Kg of organic rectorite into a reaction vessel for melt intercalation treatment, wherein the temperature is 150 ℃, the rotating speed is 30r/min, and the reaction time is 10min, so as to obtain a mixture;
(2) and (2) adding the mixture obtained in the step (1) into an open mill for open milling and forming, wherein the open milling and forming temperature is 50 ℃, and the reaction time is 60min, so as to obtain the modified hydrogenated nitrile rubber.
The preparation method of the heat-resistant and high-strength rubber product can refer to example 1.
Example 4
A heat-resistant high-strength rubber product comprises the following raw materials: 120Kg of nitrile rubber, 40Kg of PVC resin, 3Kg of stabilizer, 1Kg of stearic acid, 32Kg of reinforcing agent, 6Kg of plasticizer, 3Kg of vulcanizing agent, 5Kg of rubber accelerator, 6Kg of anti-aging agent and 1.6Kg of mold release agent;
in the formula, the reinforcing agent is prepared from the following components in a mass ratio of 12: 15: 3, the particle size of the hydrophobic silicon dioxide is 10-20 nm; the mass ratio of the plasticizer is 12: 5 a mixture of diisodecyl phthalate and epoxy sunflower oil; the anti-aging agent is anti-aging agent HS-911.
The nitrile rubber is modified hydrogenated nitrile rubber, and the modified hydrogenated nitrile rubber is hydrogenated nitrile rubber modified by organic rectorite, and as shown in figure 1, the preparation process is as follows:
(1) adding 176Kg of hydrogenated nitrile rubber and 20Kg of organic rectorite into a reaction vessel for melt intercalation treatment, wherein the temperature is 120 ℃, the rotating speed is 40r/min, and the reaction time is 20min, so as to obtain a mixture;
(2) and (2) adding the mixture obtained in the step (1) into an open mill for open milling and forming, wherein the open milling and forming temperature is 50 ℃, and the reaction time is 30min, so as to obtain the modified hydrogenated nitrile rubber.
The preparation method of the heat-resistant and high-strength rubber product can refer to example 1.
Comparative example 1
Comparative example 1 is a comparative example to example 2, and the two are distinguished in that: in comparative example 1, 32Kg of carbon black was used as a reinforcing agent, and the rest was the same as in example 2.
Comparative example 2
Comparative example 2 is a comparative example to example 2, and the two are distinguished in that: in comparative example 2, the nitrile rubber was a commercial product without modification, and the rest was the same as in example 2.
Comparative example 3
Comparative example 3 is a comparative example to example 2, and the two are distinguished in that: in comparative example 3, the nitrile rubber was a commercially available product without modification, and the reinforcing agent was 32Kg of carbon black, and the rest was the same as in example 2.
Examples of the experiments
The rubber products prepared in examples 1 to 4 and comparative examples 1 to 3 were respectively tested for tensile property, hardness and aging resistance, and the specific test procedures were as follows:
and (3) testing tensile property: cutting the prepared rubber product into a standard dumbbell-shaped test piece, printing two parallel marked lines on the middle parallel part of the test piece, wherein the two marked lines are equidistant from the center of the test piece and are vertical to the long axis direction of the test piece, the initial distance between the two parallel marked lines is 20 +/-0.5 mm, performing a tensile property test on a universal material testing machine according to the national standard GB/T528-92, testing the tensile strength and the elongation at break of the test piece at a tensile speed of 500mm/min, testing five groups of each test piece, and calculating the average value.
And (3) hardness testing: according to the national standard GB/T531-1999, the hardness of the test piece is tested by a Shore hardness tester, each point on the test piece is only measured once, the distance between the measured points is not less than 5mm, the distance between the measured points and the edge of the test piece is not less than 12mm, the measured point of each test piece is not less than 5 points, and the hardness value is obtained by averaging.
And (3) aging resistance test: and testing the hot air aging performance according to the standard GB3512-98, aging for 72 hours at 150 ℃, and testing the volume change rate and 300% stress at definite elongation of the test piece.
The test results are shown in table 1.
From the test results in table 1, it can be seen that the rubber products obtained in examples 1 to 4 of the present invention have high strength, high temperature resistance, and high compression set resistance. As can be seen from the tensile strength change curve in fig. 3 and the breaking elongation change curve in fig. 4, the tensile properties of example 2 are improved by more than one time compared with those of comparative example 1, comparative example 2 and comparative example 3, which shows that the carbon black, the nano white carbon black and the hydrophobic silica are used as the reinforcing agent, and the hydrogenated nitrile rubber modified by the organic rectorite is selected, so that the reinforcing agent has an effective reinforcing effect, and the tensile property of comparative example 3 is the lowest, so that the reinforcing agent and the modified hydrogenated nitrile rubber have a synergistic effect.
As can be seen from the hardness change curve in FIG. 5 and the property parameter change curve after the anti-aging treatment in FIG. 6, the rubber product of the present invention has high hardness and excellent anti-aging property.
In conclusion, the nitrile rubber and the PVC resin are used as base materials, and the reinforcing agent is matched with other raw material components, so that the prepared rubber product has high strength, a wide use temperature range and high temperature resistance and compression deformation resistance; the carbon black, the nano white carbon black and the hydrophobic silica in the reinforcing agent are mutually matched to provide a high-efficiency reinforcing and wear-resisting effect for the rubber product, the acting force between the reinforcing agent and the rubber substrate is stronger, the powder falling phenomenon cannot occur in use, and the service life of the rubber product is prolonged; by selecting the hydrogenated nitrile rubber modified by organic rectorite, the nano-dispersed organic rectorite can reduce the using amount of the hydrogenated nitrile rubber, reduce the cost, simultaneously have obvious reinforcing effect on a rubber matrix, and can further improve the mechanical property and the wear resistance of a rubber product by the synergistic effect of the reinforcing agent and the reinforcing agent. Through test tests, the hardness of the prepared rubber product reaches 74.8-76.5, the tensile strength reaches 18-22MPa, the elongation at break is 240-280%, and the anti-aging performance is excellent.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (8)
1. A heat-resistant high-strength rubber product is characterized by comprising the following raw materials in parts by mass: 100-120 parts of nitrile rubber, 40-60 parts of PVC resin, 1-3 parts of stabilizer, 1-2 parts of stearic acid, 30-40 parts of reinforcing agent, 5-8 parts of plasticizer, 1-3 parts of vulcanizing agent, 3-6 parts of rubber accelerator and 2-8 parts of anti-aging agent;
wherein the reinforcing agent is prepared from (8-12) by mass: (10-15): (2-5) a mixture of carbon black, nano white carbon black and hydrophobic silica, wherein the particle size of the hydrophobic silica is 10-20 nm.
2. The heat-resistant, high-strength rubber article of claim 1 wherein said nitrile rubber is a modified hydrogenated nitrile rubber, said modified hydrogenated nitrile rubber being a hydrogenated nitrile rubber modified with an organic rectorite.
3. The heat-resistant, high-strength rubber article of claim 2 wherein said modified hydrogenated nitrile rubber is prepared by the process of:
(1) adding 80-100 parts by mass of hydrogenated nitrile rubber and 10-15 parts by mass of organic rectorite into a reaction vessel for carrying out melting intercalation treatment, wherein the temperature is 120-;
(2) and (2) adding the mixture obtained in the step (1) into an open mill for open milling and forming, wherein the open milling and forming temperature is 50-60 ℃, and the reaction time is 30-60min, so as to obtain the modified hydrogenated nitrile rubber.
4. The heat-resistant, high-strength rubber article of claim 1 further comprising 1-2 parts of a mold release agent, wherein the mold release agent is an alkyl phosphate.
5. The heat-resistant, high-strength rubber article of claim 1, wherein the plasticizer is present in a mass ratio of (10-20): (4-8) a mixture of diisodecyl phthalate and epoxy sunflower oil.
6. The heat-resistant, high-strength rubber article of claim 1 wherein the vulcanizing agent is sulfur, the rubber accelerator is tetramethylthiuram disulfide, the stabilizer is a calcium zinc stabilizer, and the antioxidant is antioxidant RD, antioxidant 4020, antioxidant HS-911, or antioxidant 1010.
7. A method of making a heat-resistant, high-strength rubber article according to claim 1, comprising the steps of:
s1, adding the nitrile rubber and the PVC resin into an internal mixer, internally mixing for 10-15min at 70-80 ℃, then adding the reinforcing agent and the plasticizer, heating to 85-90 ℃, and continuously internally mixing for 20-30min to obtain rubber compound;
s2, adding the rubber compound into an open mill, adding a stabilizer, stearic acid, a vulcanizing agent, a rubber accelerator and an anti-aging agent into the rubber compound, and carrying out open milling molding at the temperature of 60-70 ℃ to obtain a molded part;
and S3, sequentially carrying out primary vulcanization treatment and secondary vulcanization treatment on the obtained formed piece, and discharging to obtain the heat-resistant and high-strength rubber product.
8. The method for producing a heat-resistant, high-strength rubber article according to claim 7, wherein the primary vulcanization is carried out in a press vulcanizer under the following conditions: vulcanizing at 170 deg.C and 190MPa for 30-40 min; the secondary vulcanization is carried out in an oven, and the specific conditions of the secondary vulcanization treatment are as follows: vulcanizing at 180 deg.C and 200MPa for 4-6 h.
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| JP2019199549A (en) * | 2018-05-16 | 2019-11-21 | Nok株式会社 | Rubber composition and seal material |
| CN110628151A (en) * | 2019-10-29 | 2019-12-31 | 重庆长安汽车股份有限公司 | Heat-resistant nitrile butadiene rubber and polyvinyl chloride blended rubber and preparation method thereof |
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| GB9500439D0 (en) * | 1995-01-10 | 1995-03-01 | Pileci Antonio F | Low compression set thermoplastic elastomers |
| CN101649078A (en) * | 2009-09-15 | 2010-02-17 | 哈尔滨工业大学 | Hydrogenated nitrile-butadiene rubber modified by rectorite and preparation method thereof |
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