CN111534105A - Anti-aging silicone rubber sealing material for high-speed rail sealing element and preparation method thereof - Google Patents
Anti-aging silicone rubber sealing material for high-speed rail sealing element and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an anti-aging silicone rubber sealing material for a high-speed rail sealing element, which comprises the following raw materials in parts by weight: 60-70 parts of methyl vinyl silicone rubber, 25-30 parts of fluorosilicone rubber, 6-8 parts of hydroxyl-terminated polydimethylsiloxane, 0.7-0.9 part of silane coupling agent, 0.12-0.15 part of toluene diisocyanate, 3-5 parts of white carbon black, 2-3 parts of fumed silica, 1.5-1.8 parts of zinc oxide, 2.5-4.5 parts of anti-aging agent, 2-4 parts of heat stabilizer and 2-4 parts of cross-linking agent. The aging-resistant silicone rubber sealing material for the high-speed rail sealing element has good sealing performance, excellent aging resistance, long service life, good oil resistance and solvent resistance, and good high-temperature aging resistance; in addition, the material also has good elasticity, low compression set rate, high temperature resistance, good mechanical property and the like.
Description
Technical Field
The invention relates to the technical field of high-speed rail sealing element materials, in particular to an anti-aging silicone rubber sealing material for a high-speed rail sealing element and a preparation method thereof.
Background
The rubber is elastic, insulating, waterproof and air-proof material prepared from latex of plants such as rubber tree and rubber grass. A high-elasticity polymer compound. It is divided into two types of natural rubber and synthetic rubber. The natural rubber is prepared by extracting colloid from plants such as rubber tree and rubber grass and processing; synthetic rubbers are obtained by polymerization of various monomers. The rubber product has unique performance, so that the rubber is a better raw material for manufacturing the sealing ring.
The rubber sealing element is a general basic element in a sealing device, is a rubber product widely applied in the sealing technology, and is widely suitable for being installed on various mechanical equipment due to the advantages of small elastic modulus, high elongation, air permeability resistance and the like. In the working environment, the lubricating system of mechanical equipment contains acid and alkali components, which easily permeate into the sealing element to cause the expansion of the sealing element, thus affecting the service life of the sealing element, moreover, the long-term severe working environment, such as high temperature and high pressure, accelerates the damage rate of the sealing element, the replacement cycle of the sealing element is short, and troubles are brought to the continuous production of enterprises.
However, the rubber sealing materials used at present have the following problems:
1. the sealing performance is poor, the aging resistance is poor, good sealing performance and aging resistance are difficult to achieve, poor sealing performance is easily caused by corrosion and aging, further, the problems of material waste, mechanical equipment corrosion and the like are caused, great potential safety hazards and even accidents are caused, and the performance requirements in the fields of high-speed rail sealing elements and the like cannot be met;
2. poor elasticity, high compression set, poor high temperature resistance, poor mechanical properties and the like, and poor comprehensive properties.
Based on the situation, the invention provides an anti-aging silicone rubber sealing material for a high-speed rail sealing element and a preparation method thereof, and the problems can be effectively solved.
Disclosure of Invention
The invention aims to provide an anti-aging silicone rubber sealing material for a high-speed rail sealing element and a preparation method thereof. The anti-aging silicone rubber sealing material for the high-speed rail sealing element disclosed by the invention has the advantages that the methyl vinyl silicone rubber, the fluorosilicone rubber, the hydroxyl-terminated polydimethylsiloxane, the silane coupling agent, the toluene diisocyanate, the white carbon black, the fumed silica, the zinc oxide, the anti-aging agent, the heat stabilizer and the cross-linking agent are selected in a proper ratio, and the raw materials are matched with one another to achieve a good synergistic effect, so that the anti-aging silicone rubber sealing material for the high-speed rail sealing element disclosed by the invention not only has good sealing performance, but also has excellent anti-aging performance, long service life, good oil resistance and solvent resistance and good high-temperature anti-aging performance; in addition, the material also has good elasticity, low compression set rate, high temperature resistance, good mechanical property and the like.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an anti-aging silicone rubber sealing material for a high-speed rail sealing element comprises the following raw materials in parts by weight:
60-70 parts of methyl vinyl silicone rubber,
25-30 parts of fluorosilicone rubber,
6-8 parts of hydroxyl-terminated polydimethylsiloxane,
0.7 to 0.9 part of silane coupling agent,
0.12 to 0.15 part of toluene diisocyanate,
3-5 parts of white carbon black,
2-3 parts of fumed silica,
1.5 to 1.8 parts of zinc oxide,
2.5 to 4.5 parts of anti-aging agent,
2-4 parts of heat stabilizer,
2-4 parts of a cross-linking agent.
The anti-aging silicone rubber sealing material for the high-speed rail sealing element disclosed by the invention has the advantages that the methyl vinyl silicone rubber, the fluorosilicone rubber, the hydroxyl-terminated polydimethylsiloxane, the silane coupling agent, the toluene diisocyanate, the white carbon black, the fumed silica, the zinc oxide, the anti-aging agent, the heat stabilizer and the cross-linking agent are selected in a proper ratio, and the raw materials are matched with one another to achieve a good synergistic effect, so that the anti-aging silicone rubber sealing material for the high-speed rail sealing element disclosed by the invention not only has good sealing performance, but also has excellent anti-aging performance, long service life, good oil resistance and solvent resistance and good high-temperature anti-aging performance; in addition, the material also has good elasticity, low compression set rate, high temperature resistance, good mechanical property and the like.
Preferably, the anti-aging silicone rubber sealing material for the high-speed rail sealing element comprises the following raw materials in parts by weight:
65 parts of methyl vinyl silicone rubber,
28 parts of fluorosilicone rubber,
7 parts of hydroxyl-terminated polydimethylsiloxane,
0.8 part of silane coupling agent,
0.135 part of toluene diisocyanate,
4 portions of white carbon black,
2.5 parts of fumed silica,
1.7 parts of zinc oxide,
3.5 parts of anti-aging agent,
3 parts of heat stabilizer,
And 2.8 parts of a crosslinking agent.
Preferably, the fluorosilicone rubber is FVMQ fluorosilicone rubber.
Preferably, the silane coupling agent is KH 570.
Preferably, the cross-linking agent is a mixture of sulfur and zinc methacrylate.
Preferably, the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of the cross-linking agent to the sulfur to the zinc methacrylate is 1: 0.3 to 0.37.
Preferably, the anti-aging agent is an anti-aging agent 4010.
Preferably, the heat stabilizer is stearic acid.
Preferably, the zinc oxide is nano zinc oxide.
The invention also provides a preparation method of the anti-aging silicone rubber sealing material for the high-speed rail sealing member, which comprises the following steps:
1) carrying out open mixing on methyl vinyl silicone rubber and fluorosilicone rubber in an open mill, and uniformly mixing to obtain mixed silicone rubber;
2) feeding the mixed silicon rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 10-15 min at the temperature of 100-105 ℃; then continuously mixing for 8-12 min at the temperature of 115-120 ℃; then, cooling to the temperature of 105-108 ℃, adding toluene diisocyanate and a cross-linking agent, and continuously mixing for 7-10 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
3) carrying out calendering molding on the cooled rubber material in the step 2) by a calender;
4) feeding the semi-finished product subjected to calendaring molding into an oven at 80-85 ℃ for preheating;
5) and putting the preheated rubber material into the mold cavity, uniformly and radially arranging according to the rolling direction of the rubber material, and feeding the rubber material into a flat vulcanizing machine for vulcanization to obtain the anti-aging silicone rubber sealing material for the high-speed rail sealing member.
The aging-resistant silicone rubber sealing material for the high-speed rail sealing element is mainly used as a sealing material, such as a sealing ring and the like, and the application field of the aging-resistant silicone rubber sealing material is not limited to the field of sealing materials, and can also be used in other fields.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the anti-aging silicone rubber sealing material for the high-speed rail sealing element disclosed by the invention has the advantages that the methyl vinyl silicone rubber, the fluorosilicone rubber, the hydroxyl-terminated polydimethylsiloxane, the silane coupling agent, the toluene diisocyanate, the white carbon black, the fumed silica, the zinc oxide, the anti-aging agent, the heat stabilizer and the cross-linking agent are selected in a proper ratio, and the raw materials are matched with one another to achieve a good synergistic effect, so that the anti-aging silicone rubber sealing material for the high-speed rail sealing element disclosed by the invention not only has good sealing performance, but also has excellent anti-aging performance, long service life, good oil resistance and solvent resistance and good high-temperature anti-aging performance; in addition, the material also has good elasticity, low compression set rate, high temperature resistance, good mechanical property and the like.
According to the invention, methyl vinyl silicone rubber and fluorosilicone rubber in a proper proportion are added as composite base materials in the raw materials of the anti-aging silicone rubber sealing material for the high-speed rail sealing element, wherein the methyl vinyl silicone rubber has excellent sealing performance, better thermal aging resistance and high temperature resistance, the fluorosilicone rubber (preferably, the fluorosilicone rubber is FVMQ fluorosilicone rubber.) has excellent oil resistance and solvent resistance, good heat resistance and better sealing performance, and the methyl vinyl silicone rubber and the fluorosilicone rubber are matched with each other to play a good synergistic cooperation role, so that the product (the anti-aging silicone rubber sealing material for the high-speed rail sealing element) has good sealing performance, good aging resistance, high temperature resistance, good mechanical properties and the like;
in the raw material system of the anti-aging silicone rubber sealing material for the high-speed rail sealing member, hydroxyl-terminated polydimethylsiloxane, a silane coupling agent (preferably, the silane coupling agent is KH 570.) and toluene diisocyanate in a proper proportion are added, wherein in the raw material system, isocyanate groups in the toluene diisocyanate can react with active groups such as hydroxyl groups in other components (mainly the hydroxyl-terminated polydimethylsiloxane and the silane coupling agent) to generate crosslinking, so that a network crosslinked elastomer with good elasticity is obtained, the resilience of the product can be improved, the compression permanent deformation rate is greatly reduced, and the anti-aging performance of the product is further improved; meanwhile, the sealing performance of the product is greatly improved.
According to the anti-aging silicone rubber sealing material for the high-speed rail sealing element, the white carbon black and the fumed silica are added into the raw materials in a proper proportion and are matched with other components, so that the anti-aging silicone rubber sealing material can be well and uniformly dispersed in the raw material system, the raw material system mainly plays a good role in enhancing the product, the mechanical properties such as tensile strength of the product are greatly improved, the hardness of the product can be improved to a certain extent, and the anti-aging performance of the product is further improved.
The raw materials of the anti-aging silicone rubber sealing material for the high-speed rail sealing element are added with an anti-aging agent, a heat stabilizer and a cross-linking agent in proper proportion; preferably, the cross-linking agent is a mixture of sulfur and zinc methacrylate. Preferably, the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of the cross-linking agent to the sulfur to the zinc methacrylate is 1: 0.3 to 0.37. Preferably, the anti-aging agent is an anti-aging agent 4010. Preferably, the heat stabilizer is stearic acid. The addition of the age resister (age resister 4010) can further prolong the service life of the product obtained by the raw material system; the stearic acid plays a good role in thermal stability in the processing process of the product, so that molecular chains in the processing process of the methyl vinyl silicone rubber, the fluorosilicone rubber and the like are well protected, and a good (processing) lubricating effect can be achieved; the cross-linking agent is a mixture of sulfur and zinc methacrylate, so that the product of the invention can be better cross-linked, a network cross-linked elastomer with good elasticity is obtained, the resilience of the product can be improved, the compression set rate is reduced, and the aging resistance of the product is further improved.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in connection with specific examples, which should not be construed as limiting the present patent.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
Example 1:
an anti-aging silicone rubber sealing material for a high-speed rail sealing element comprises the following raw materials in parts by weight:
60-70 parts of methyl vinyl silicone rubber,
25-30 parts of fluorosilicone rubber,
6-8 parts of hydroxyl-terminated polydimethylsiloxane,
0.7 to 0.9 part of silane coupling agent,
0.12 to 0.15 part of toluene diisocyanate,
3-5 parts of white carbon black,
2-3 parts of fumed silica,
1.5 to 1.8 parts of zinc oxide,
2.5 to 4.5 parts of anti-aging agent,
2-4 parts of heat stabilizer,
2-4 parts of a cross-linking agent.
Preferably, the anti-aging silicone rubber sealing material for the high-speed rail sealing element comprises the following raw materials in parts by weight:
65 parts of methyl vinyl silicone rubber,
28 parts of fluorosilicone rubber,
7 parts of hydroxyl-terminated polydimethylsiloxane,
0.8 part of silane coupling agent,
0.135 part of toluene diisocyanate,
4 portions of white carbon black,
2.5 parts of fumed silica,
1.7 parts of zinc oxide,
3.5 parts of anti-aging agent,
3 parts of heat stabilizer,
And 2.8 parts of a crosslinking agent.
Preferably, the fluorosilicone rubber is FVMQ fluorosilicone rubber.
Preferably, the silane coupling agent is KH 570.
Preferably, the cross-linking agent is a mixture of sulfur and zinc methacrylate.
Preferably, the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of the cross-linking agent to the sulfur to the zinc methacrylate is 1: 0.3 to 0.37.
Preferably, the anti-aging agent is an anti-aging agent 4010.
Preferably, the heat stabilizer is stearic acid.
Preferably, the zinc oxide is nano zinc oxide.
The invention also provides a preparation method of the anti-aging silicone rubber sealing material for the high-speed rail sealing member, which comprises the following steps:
1) carrying out open mixing on methyl vinyl silicone rubber and fluorosilicone rubber in an open mill, and uniformly mixing to obtain mixed silicone rubber;
2) feeding the mixed silicon rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 10-15 min at the temperature of 100-105 ℃; then continuously mixing for 8-12 min at the temperature of 115-120 ℃; then, cooling to the temperature of 105-108 ℃, adding toluene diisocyanate and a cross-linking agent, and continuously mixing for 7-10 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
3) carrying out calendering molding on the cooled rubber material in the step 2) by a calender;
4) feeding the semi-finished product subjected to calendaring molding into an oven at 80-85 ℃ for preheating;
5) and putting the preheated rubber material into the mold cavity, uniformly and radially arranging according to the rolling direction of the rubber material, and feeding the rubber material into a flat vulcanizing machine for vulcanization to obtain the anti-aging silicone rubber sealing material for the high-speed rail sealing member.
Example 2:
an anti-aging silicone rubber sealing material for a high-speed rail sealing element comprises the following raw materials in parts by weight:
60 parts of methyl vinyl silicone rubber,
25 parts of fluorosilicone rubber,
6 parts of hydroxyl-terminated polydimethylsiloxane,
0.7 part of silane coupling agent,
0.12 part of toluene diisocyanate,
3 portions of white carbon black,
2 parts of fumed silica,
1.5 parts of zinc oxide,
2.5 parts of anti-aging agent,
2 portions of heat stabilizer,
And 2 parts of a crosslinking agent.
In this embodiment, the fluorosilicone rubber is FVMQ fluorosilicone rubber.
In this example, the silane coupling agent is KH 570.
In this example, the crosslinker is a mixture of sulfur and zinc methacrylate.
In this embodiment, the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of the cross-linking agent to the sulfur to the zinc methacrylate is 1: 0.3.
in this embodiment, the anti-aging agent is an anti-aging agent 4010.
In this example, the thermal stabilizer is stearic acid.
In this embodiment, the zinc oxide is nano zinc oxide.
In this embodiment, the preparation method of the aging-resistant silicone rubber sealing material for a high-speed rail sealing member includes the following steps:
1) carrying out open mixing on methyl vinyl silicone rubber and fluorosilicone rubber in an open mill, and uniformly mixing to obtain mixed silicone rubber;
2) feeding the mixed silicon rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 15min at the temperature of 100 ℃; then continuously mixing for 12min at the temperature of 115 ℃; then, cooling to 105 ℃, adding toluene diisocyanate and a cross-linking agent, and continuously mixing for 10 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
3) carrying out calendering molding on the cooled rubber material in the step 2) by a calender;
4) sending the semi-finished product subjected to calendaring molding into an oven at 80 ℃ for preheating;
5) and putting the preheated rubber material into the mold cavity, uniformly and radially arranging according to the rolling direction of the rubber material, and feeding the rubber material into a flat vulcanizing machine for vulcanization to obtain the anti-aging silicone rubber sealing material for the high-speed rail sealing member.
Example 3:
an anti-aging silicone rubber sealing material for a high-speed rail sealing element comprises the following raw materials in parts by weight:
70 parts of methyl vinyl silicone rubber,
30 parts of fluorosilicone rubber,
8 parts of hydroxyl-terminated polydimethylsiloxane,
0.9 part of silane coupling agent,
0.15 part of toluene diisocyanate,
5 portions of white carbon black,
3 parts of fumed silica,
1.8 parts of zinc oxide,
4.5 portions of anti-aging agent,
4 portions of heat stabilizer,
4 parts of a crosslinking agent.
In this embodiment, the fluorosilicone rubber is FVMQ fluorosilicone rubber.
In this example, the silane coupling agent is KH 570.
In this example, the crosslinker is a mixture of sulfur and zinc methacrylate.
In this embodiment, the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of the cross-linking agent to the sulfur to the zinc methacrylate is 1: 0.37.
in this embodiment, the anti-aging agent is an anti-aging agent 4010.
In this example, the thermal stabilizer is stearic acid.
In this embodiment, the zinc oxide is nano zinc oxide.
In this embodiment, the preparation method of the aging-resistant silicone rubber sealing material for a high-speed rail sealing member includes the following steps:
1) carrying out open mixing on methyl vinyl silicone rubber and fluorosilicone rubber in an open mill, and uniformly mixing to obtain mixed silicone rubber;
2) feeding the mixed silicon rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 10min at the temperature of 105 ℃; then continuously mixing for 8min at the temperature of 120 ℃; then, cooling to 108 ℃, adding toluene diisocyanate and a cross-linking agent, and continuously mixing for 7 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
3) carrying out calendering molding on the cooled rubber material in the step 2) by a calender;
4) sending the semi-finished product subjected to calendaring molding into an oven at 85 ℃ for preheating;
5) and putting the preheated rubber material into the mold cavity, uniformly and radially arranging according to the rolling direction of the rubber material, and feeding the rubber material into a flat vulcanizing machine for vulcanization to obtain the anti-aging silicone rubber sealing material for the high-speed rail sealing member.
Example 4:
an anti-aging silicone rubber sealing material for a high-speed rail sealing element comprises the following raw materials in parts by weight:
65 parts of methyl vinyl silicone rubber,
28 parts of fluorosilicone rubber,
7 parts of hydroxyl-terminated polydimethylsiloxane,
0.8 part of silane coupling agent,
0.135 part of toluene diisocyanate,
4 portions of white carbon black,
2.5 parts of fumed silica,
1.7 parts of zinc oxide,
3.5 parts of anti-aging agent,
3 parts of heat stabilizer,
And 2.8 parts of a crosslinking agent.
In this embodiment, the fluorosilicone rubber is FVMQ fluorosilicone rubber.
In this example, the silane coupling agent is KH 570.
In this example, the crosslinker is a mixture of sulfur and zinc methacrylate.
In this embodiment, the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of the cross-linking agent to the sulfur to the zinc methacrylate is 1: 0.335.
in this embodiment, the anti-aging agent is an anti-aging agent 4010.
In this example, the thermal stabilizer is stearic acid.
In this embodiment, the zinc oxide is nano zinc oxide.
In this embodiment, the preparation method of the aging-resistant silicone rubber sealing material for a high-speed rail sealing member includes the following steps:
1) carrying out open mixing on methyl vinyl silicone rubber and fluorosilicone rubber in an open mill, and uniformly mixing to obtain mixed silicone rubber;
2) feeding the mixed silicon rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 13min at the temperature of 103 ℃; then continuously mixing for 10min at the temperature of 118 ℃; then, cooling to 107 ℃, adding toluene diisocyanate and a cross-linking agent, and continuously mixing for 8 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
3) carrying out calendering molding on the cooled rubber material in the step 2) by a calender;
4) sending the semi-finished product subjected to calendaring molding into an oven at 83 ℃ for preheating;
5) and putting the preheated rubber material into the mold cavity, uniformly and radially arranging according to the rolling direction of the rubber material, and feeding the rubber material into a flat vulcanizing machine for vulcanization to obtain the anti-aging silicone rubber sealing material for the high-speed rail sealing member.
Comparative example 1:
the difference from example 4 is that the fluorosilicone rubber was replaced with a methyl vinyl silicone rubber, and the other examples were the same as example 4.
Comparative example 2:
the difference from example 4 is that the hydroxyl-terminated polydimethylsiloxane, silane coupling agent and toluene diisocyanate were not included, and the other examples were the same as example 4.
Comparative example 3:
the difference from example 4 is that the crosslinking agent is sulfur, and the other is the same as example 4.
The aging-resistant silicone rubber sealing materials for high-speed railway seals obtained in examples 2 to 4 of the present invention and the ordinary rubber sealing materials were subjected to performance tests (tests were carried out with reference to the standard HG/T2579-94), and the test results are shown in table 1:
TABLE 1
The analysis on the table shows that the aging-resistant silicone rubber sealing material for the high-speed rail sealing element has good high-temperature aging resistance; also has good elasticity, low compression set, high temperature resistance, good mechanical property and the like.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. The aging-resistant silicone rubber sealing material for the high-speed rail sealing element is characterized by comprising the following raw materials in parts by weight:
60-70 parts of methyl vinyl silicone rubber, 25-30 parts of fluorosilicone rubber, 6-8 parts of hydroxyl-terminated polydimethylsiloxane, 0.7-0.9 part of silane coupling agent, 0.12-0.15 part of toluene diisocyanate, 3-5 parts of white carbon black, 2-3 parts of fumed silica, 1.5-1.8 parts of zinc oxide, 2.5-4.5 parts of anti-aging agent, 2-4 parts of heat stabilizer and 2-4 parts of cross-linking agent.
2. The aging-resistant silicone rubber sealing material for a high-speed rail seal according to claim 1, characterized by comprising the following raw materials in parts by weight:
65 parts of methyl vinyl silicone rubber, 28 parts of fluorosilicone rubber, 7 parts of hydroxyl-terminated polydimethylsiloxane, 0.8 part of silane coupling agent, 0.135 part of toluene diisocyanate, 4 parts of white carbon black, 2.5 parts of fumed silica, 1.7 parts of zinc oxide, 3.5 parts of anti-aging agent, 3 parts of heat stabilizer and 2.8 parts of crosslinking agent.
3. The aging-resistant silicone rubber sealing material for a high-speed rail seal according to claim 1, wherein the fluorosilicone rubber is FVMQ fluorosilicone rubber.
4. The aging-resistant silicone rubber sealing material for a high-speed railway seal according to claim 1, wherein the silane coupling agent is KH 570.
5. The aging-resistant silicone rubber seal material for high-speed rail seals according to claim 1, wherein the crosslinking agent is a mixture of sulfur and zinc methacrylate.
6. The aging-resistant silicone rubber sealing material for high-speed rail seals according to claim 5, wherein the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of the cross-linking agent to the sulfur to the zinc methacrylate is 1: 0.3 to 0.37.
7. The aging-resistant silicone rubber sealing material for a high-speed railway seal according to claim 1, wherein the aging inhibitor is an aging inhibitor 4010.
8. The aging-resistant silicone rubber sealing material for high-speed rail seals according to claim 1, wherein the heat stabilizer is stearic acid.
9. The aging-resistant silicone rubber sealing material for a high-speed rail seal according to claim 1, wherein the zinc oxide is nano zinc oxide.
10. The preparation method of the aging-resistant silicone rubber sealing material for the high-speed rail sealing member as claimed in any one of claims 1 to 9, characterized by comprising the following steps:
1) carrying out open mixing on methyl vinyl silicone rubber and fluorosilicone rubber in an open mill, and uniformly mixing to obtain mixed silicone rubber;
2) feeding the mixed silicon rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 10-15 min at the temperature of 100-105 ℃; then continuously mixing for 8-12 min at the temperature of 115-120 ℃; then, cooling to the temperature of 105-108 ℃, adding toluene diisocyanate and a cross-linking agent, and continuously mixing for 7-10 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
3) carrying out calendering molding on the cooled rubber material in the step 2) by a calender;
4) feeding the semi-finished product subjected to calendaring molding into an oven at 80-85 ℃ for preheating;
5) and putting the preheated rubber material into the mold cavity, uniformly and radially arranging according to the rolling direction of the rubber material, and feeding the rubber material into a flat vulcanizing machine for vulcanization to obtain the anti-aging silicone rubber sealing material for the high-speed rail sealing member.
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| CN112109352A (en) * | 2020-09-03 | 2020-12-22 | 平湖市新庙医疗器械股份有限公司 | Production process of medical high-performance caster |
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| CN113717531A (en) * | 2021-10-21 | 2021-11-30 | 惠州市兴华源家居用品有限公司 | High-sealing silicon rubber material |
| CN114773855A (en) * | 2022-05-19 | 2022-07-22 | 南京利德东方橡塑科技有限公司 | Flame-retardant silica gel hose for high-speed rail traction converter and preparation method thereof |
| CN114773855B (en) * | 2022-05-19 | 2023-08-04 | 南京利德东方橡塑科技有限公司 | Flame-retardant silica gel hose for high-speed rail traction converter and preparation method thereof |
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