CN114854205A - High-tear-strength silicone rubber and preparation method thereof - Google Patents
High-tear-strength silicone rubber and preparation method thereof Download PDFInfo
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- CN114854205A CN114854205A CN202110151436.0A CN202110151436A CN114854205A CN 114854205 A CN114854205 A CN 114854205A CN 202110151436 A CN202110151436 A CN 202110151436A CN 114854205 A CN114854205 A CN 114854205A
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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
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses high-tear-strength silicone rubber which comprises 100 parts of methyl vinyl silicone rubber crude rubber, 30-60 parts of white carbon black, 0.3-0.5 part of gamma-aminopropyltriethoxysilane, 0.3-1 part of tetramethyl tetravinylcyclotetrasiloxane, 3-10 parts of hydroxyl silicone oil and 1-2.5 parts of 2, 4-dichloroperoxybenzoyl vulcanizing agent; the preparation method comprises the following steps: putting the raw materials into a kneading machine for mixing to prepare mixing base rubber; cooling the mixed base rubber, and adding tetramethyl tetravinylcyclotetrasiloxane and a vulcanizing agent to obtain a vulcanizing agent-containing mixed rubber; and (3) carrying out compression molding on the mixed rubber containing the vulcanizing agent and carrying out secondary vulcanization to obtain the product. The high-tear-strength silicone rubber provided by the invention not only has higher mechanical properties, but also has better elongation at break, wherein the tensile strength is more than 8.5MPa, the elongation at break is more than 550%, and the tear strength is more than 50KN/m, so that the requirements of the application field of silicone rubber are further expanded and met.
Description
Technical Field
The invention relates to the technical field of silicone rubber production, in particular to high-tear-strength silicone rubber for an extrusion process and a preparation method thereof.
Background
The silicon rubber is a polymer consisting of organic groups such as-Si-O-chain of a main chain and methyl, vinyl and the like of a side chain, has excellent high and low temperature performance, weather resistance and electric insulation, and has wide application in the fields of automobiles, electric power, aerospace and the like. With the development of the technology, the research on the silicon rubber is further deepened, the silicon rubber is applied in more and more fields, and the new application field also puts higher requirements on the performance of the silicon rubber. For example, in the fields of aerospace, 5G communication and military industry, high-tear strength silicone rubber is required to replace the existing non-silicone rubber products so as to meet the use requirements. If the tearing strength of the silicone rubber can be further improved, the excellent high and low temperature performance, weather resistance and electric insulation of the silicone rubber are utilized, and the product can be applied in more fields.
Most of the existing high-tear silicone rubber plays a role in regulating and controlling a vinyl crosslinking structure of the silicone rubber by using a vinyl-containing auxiliary agent, and the method is suitable for a platinum vulcanization system and a 2, 5-dimethyl-2, 5-di-tert-butyl-hexane peroxide vulcanizing agent. However, the platinum vulcanizing agent is high in price and easy to be poisoned, so that the application of the platinum vulcanizing agent is influenced. 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide vulcanizing agent, the vulcanization needs high temperature and high pressure, and the vulcanization is more limited. When general-purpose vulcanizing agent 2, 4-dichloro benzoyl peroxide is used, the prior patent document CN106589964A "a high-tear strength type high-temperature vulcanized silicone rubber, a preparation method and an application thereof" discloses a method for improving tear strength by adding a polyvinyl auxiliary agent, which can improve the tear strength of silicone rubber, but can also cause the elongation at break of silicone rubber to be lower, and the application of the silicone rubber in more fields is greatly limited due to the excessively low elongation. Therefore, how to maintain the better elongation at break of the rubber compound while improving the tear strength is the key for further expanding the application range of the rubber compound.
Disclosure of Invention
The invention aims to provide high-tear-strength silicone rubber and a preparation method thereof. Under a general vulcanization system, the invention provides concentrated crosslinking points through tetramethyl tetravinylcyclotetrasiloxane, and gamma-aminopropyltriethoxysilane is added, so that the dispersion of white carbon black can be promoted, and an acidic byproduct generated by a general vulcanizing agent 2, 4-dichloroperoxybenzoyl can be neutralized during vulcanization, so that the mechanical property of a rubber material is improved, and the rubber material has good elongation at break. The high-tear-strength silicone rubber prepared by the invention has the tensile strength of more than 8.5MPa, the elongation at break of more than 550 percent and the tear strength of more than 50KN/m, and further expands and meets the requirements of the application field of silicone rubber.
The purpose of the invention is realized by the following technical scheme:
the high-tear-strength silicone rubber comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 30-60 parts of white carbon black, 0.3-0.5 part of gamma-aminopropyltriethoxysilane, 0.3-1 part of tetramethyl tetravinylcyclotetrasiloxane, 3-10 parts of hydroxyl silicone oil and 1-2.5 parts of vulcanizing agent.
In the invention, the raw methyl vinyl silicone rubber is prepared by mixing raw methyl vinyl silicone rubber A, raw methyl vinyl silicone rubber B and raw methyl vinyl silicone rubber C in parts by weight;
wherein, the raw methyl vinyl silicone rubber A accounts for 60-90 parts, the raw methyl vinyl silicone rubber B accounts for 9-40 parts, and the raw methyl vinyl silicone rubber C accounts for 0-1 part.
Further, the molecular weight of the raw methyl vinyl silicone rubber A is 60-90 ten thousand, wherein the molar content of vinyl is 0.03-0.08%;
the molecular weight of the raw methyl vinyl silicone rubber B is 60-90 ten thousand, wherein the molar content of vinyl is 0.16-0.22%;
the molecular weight of the raw methyl vinyl silicone rubber C is 60-90 ten thousand, wherein the molar content of vinyl is 1-5%.
In the present invention, the ratio of white carbon blackThe surface area is 180-400 m 2 (ii) in terms of/g. The function of increasing the mechanical strength of the silicon rubber is achieved.
In the invention, the viscosity of the hydroxyl silicone oil is 50-1000 cs.
In the invention, the vulcanizing agent is selected from 2, 4-dichloro benzoyl peroxide and is a general vulcanizing agent.
The preparation method of the high-tear-strength silicone rubber comprises the following steps:
A. putting raw methyl vinyl silicone rubber and hydroxyl silicone oil into a kneading machine;
B. adding white carbon black and gamma-aminopropyltriethoxysilane into the kneading machine in the step A in batches, controlling the mixing temperature to be 130-180 ℃, mixing into a mass, continuing stirring for 1-4 hours, and vacuumizing to obtain a mixing base rubber;
C. b, taking the mixed base rubber in the step B out of the pot, cooling, and adding tetramethyl tetravinylcyclotetrasiloxane and a vulcanizing agent on a double roller to obtain a vulcanizing agent-containing mixed rubber;
D. c, molding the mixed rubber containing the vulcanizing agent in the step C for 10-15 minutes at the temperature of 160-180 ℃ to obtain primary vulcanized silicone rubber, and performing secondary vulcanization on the primary vulcanized silicone rubber at the temperature of 180-220 ℃ for 1-5 hours to obtain the high-tear-strength silicone rubber; the tensile strength is more than 8.5MPa, the elongation at break is more than 550 percent, and the tearing strength is more than 50 KN/m.
Further, in the step B, adding the white carbon black and the gamma-aminopropyltriethoxysilane into the kneader in the step A in 2-4 batches, wherein the feeding time interval is 20-45 minutes.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the invention, raw methyl vinyl silicone rubber is used as a main raw material, a centralized crosslinking point is provided by tetramethyl tetravinylcyclotetrasiloxane under a general vulcanization system, gamma-aminopropyltriethoxysilane is added to promote the dispersion of white carbon black, and an acidic byproduct generated by general vulcanizing agent 2, 4-dichloroperoxybenzoyl can be neutralized during vulcanization, so that the prepared high-tear-strength silicone rubber has high mechanical properties and good elongation at break.
Although gamma-aminopropyltriethoxysilane can neutralize acidic byproducts generated in the rubber material vulcanization process, tetramethyltetravinylcyclotetrasiloxane is a ring body, the chain segment is short, and the vinyl content is high, when the two components are used independently, the rubber material is not obviously improved in tearing, and the elongation rate is easily reduced, the tearing is reduced, and the rubber material becomes brittle. According to the invention, gamma-aminopropyltriethoxysilane is used in combination with tetramethyltetravinylcyclotetrasiloxane, and the addition amount is controlled, so that the crosslinking structure of the sizing material can be adjusted, the concentrated crosslinking points are increased, acidic byproducts generated in the vulcanization process can be neutralized, the damage of acidic byproducts to the molecular chain and the crosslinking structure of the sizing material is prevented, and the purposes of increasing the tearing strength and the elongation at break are achieved.
(2) According to the invention, two or three methyl vinyl silicone rubber raw rubbers with the same molecular weight and different vinyl molar contents are mixed, and the mechanical property of the rubber material can be adjusted by adjusting the cross-linking structure of the rubber material, so that the effect of improving the mechanical property of the rubber material is achieved.
(3) The invention uses general 2, 4-dichloro benzoyl peroxide as vulcanizing agent, which can crosslink with methyl and vinyl, and has low vulcanizing temperature, can adopt hot air for vulcanization, does not need pressurization, and is suitable for extrusion molding.
(4) In the preparation process of the silicone rubber, because the primary vulcanization time is short, and part of residual vinyl and methyl are not finished with the rubber, the rubber is more complete through the extrusion and secondary vulcanization processes, so that the rubber with more stable mechanical property is obtained, the production process is simple and easy to implement, and the prepared silicone rubber with high tear strength can be applied to the fields of aerospace, 5G communication, military industry and the like.
Detailed Description
The present invention will be described in further detail below with reference to examples for better explaining the present invention, but the embodiments of the present invention are not limited thereto.
Example 1
The high-tear strength silicone rubber comprises the following components in parts by weightConsists of the following components: 100 parts of raw methyl vinyl silicone rubber (wherein, 60 parts of raw methyl vinyl rubber with the vinyl molar content of 0.05 percent, 39 parts of raw methyl vinyl rubber with the vinyl molar content of 0.16 percent, 1 part of raw methyl vinyl rubber with the vinyl molar content of 3 percent, the molecular weight of the three raw rubbers is 60-70 ten thousand), and the specific surface area is 200m 2 35 parts of white carbon black per gram, 0.3 part of gamma-aminopropyl triethoxysilane, 0.6 part of tetramethyl tetravinylcyclotetrasiloxane, 4.5 parts of hydroxyl silicone oil with the viscosity of 50cs and 1.5 parts of 2, 4-dichloro benzoyl peroxide vulcanizing agent;
the preparation method comprises the following steps:
A. putting the raw methyl vinyl silicone rubber and the hydroxyl silicone oil in parts by weight into a kneading machine;
B. b, dividing the white carbon black and the gamma-aminopropyltriethoxysilane by the weight parts into 2 batches, adding the batches into the kneading machine in the step A at intervals of 45 minutes every time, controlling the mixing temperature to be 130 ℃, continuously stirring for 2 hours after mixing and agglomerating, and vacuumizing to obtain mixing base rubber;
C. b, taking the mixed base rubber in the step B out of the pot, cooling, and adding the tetramethyl tetravinylcyclotetrasiloxane and the vulcanizing agent in parts by weight on a double roller to obtain a vulcanizing agent-containing mixed rubber;
D. and C, molding the mixed rubber containing the vulcanizing agent in the step C for 12 minutes at the temperature of 160 ℃ to obtain primary vulcanized silicone rubber, and performing secondary vulcanization on the primary vulcanized silicone rubber at the temperature of 200 ℃ for 3 hours to obtain the high-tear-strength silicone rubber I.
Example 2
100 parts of raw methyl vinyl silicone rubber (wherein, 60 parts of raw methyl vinyl rubber with the vinyl molar content of 0.08 percent, 39 parts of raw methyl vinyl rubber with the vinyl molar content of 0.20 percent, 1 part of raw methyl vinyl rubber with the vinyl molar content of 1 percent, and the molecular weight of all three raw rubbers is 60-70 ten thousand); except that the molar vinyl content of the raw rubber of the three methyl vinyl silicone rubbers is different from that of the raw rubber of the example 1, the weight parts of other components and the preparation method are the same as those of the raw rubber of the example 1, so that the silicone rubber II with high tear strength is obtained.
Example 3
The high-tear-strength silicone rubber comprises the following components in parts by weight: 100 parts of raw methyl vinyl silicone rubber (wherein 80 parts of raw methyl vinyl rubber with the vinyl molar content of 0.05 percent, 20 parts of raw methyl vinyl rubber with the vinyl molar content of 0.16 percent, the molecular weight of the two raw rubbers is 70-80 ten thousand), and the specific surface area is 180m 2 40 parts of white carbon black per gram, 0.4 part of gamma-aminopropyl triethoxysilane, 1 part of tetramethyl tetravinylcyclotetrasiloxane, 6 parts of hydroxyl silicone oil with the viscosity of 500cs and 1 part of 2, 4-dichloro benzoyl peroxide vulcanizing agent;
the preparation method comprises the following steps:
A. putting the raw methyl vinyl silicone rubber and the hydroxyl silicone oil in parts by weight into a kneading machine;
B. adding the white carbon black and the gamma-aminopropyltriethoxysilane in parts by weight into the kneading machine in the step A in 3 batches at intervals of 30 minutes every time, controlling the mixing temperature to be 180 ℃, continuously stirring for 1 hour after mixing and agglomerating, and vacuumizing to obtain mixing base rubber;
C. b, taking the mixed base rubber in the step B out of the pot, cooling, and adding the tetramethyl tetravinylcyclotetrasiloxane and the vulcanizing agent in parts by weight on a double roller to obtain a vulcanizing agent-containing mixed rubber;
D. and C, molding the mixed rubber containing the vulcanizing agent in the step C for 10 minutes at the temperature of 180 ℃ to obtain primary vulcanized silicone rubber, and performing secondary vulcanization on the primary vulcanized silicone rubber at the temperature of 220 ℃ for 1 hour to obtain the high-tear-strength silicone rubber III.
Example 4
100 parts of raw methyl vinyl silicone rubber (wherein 80 parts of raw methyl vinyl rubber with the vinyl molar content of 0.03 percent, 20 parts of raw methyl vinyl rubber with the vinyl molar content of 0.18 percent, and the molecular weights of the two raw rubbers are 70-80 ten thousand); except that the vinyl molar contents of the two raw methyl vinyl silicone rubbers are different from those of the raw methyl vinyl silicone rubber in example 3, the weight parts of other components and the preparation method are the same as those of the raw methyl vinyl silicone rubber in example 3, so that the high-tear-strength silicone rubber IV is obtained.
Example 5
The high-tear-strength silicone rubber comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber (wherein 90 parts of methyl vinyl raw rubber with the vinyl molar content of 0.05 percent, 9.5 parts of methyl vinyl raw rubber with the vinyl molar content of 0.16 percent, 0.5 part of methyl vinyl raw rubber with the vinyl molar content of 5 percent, the molecular weight of the three raw rubbers is 80-90 ten thousand), and the specific surface area is 400m 2 60 parts of white carbon black per gram, 0.5 part of gamma-aminopropyl triethoxysilane, 0.5 part of tetramethyl tetravinylcyclotetrasiloxane, 10 parts of hydroxyl silicone oil with the viscosity of 1000cs and 2.5 parts of 2, 4-dichloro benzoyl peroxide vulcanizing agent;
the preparation method comprises the following steps:
A. putting the raw methyl vinyl silicone rubber and the hydroxyl silicone oil in parts by weight into a kneading machine;
B. adding the white carbon black and the gamma-aminopropyltriethoxysilane in parts by weight into the kneading machine in the step A in 4 batches at intervals of 20 minutes every time, controlling the mixing temperature to be 150 ℃, continuously stirring for 4 hours after mixing and agglomerating, and vacuumizing to obtain mixing base rubber;
C. b, taking the mixed base rubber in the step B out of the pot, cooling, and adding the tetramethyl tetravinylcyclotetrasiloxane and the vulcanizing agent in parts by weight on a double roller to obtain a vulcanizing agent-containing mixed rubber;
D. and C, carrying out die pressing on the mixed rubber containing the vulcanizing agent in the step C for 15 minutes at the temperature of 170 ℃ for forming to obtain primary vulcanized silicone rubber, and carrying out secondary vulcanization on the primary vulcanized silicone rubber at the temperature of 180 ℃ for 5 hours to obtain the high-tear-strength silicone rubber V.
Example 6
100 parts of methyl vinyl silicone rubber raw rubber (wherein 90 parts of methyl vinyl raw rubber with the vinyl molar content of 0.06 percent, 9.5 parts of methyl vinyl raw rubber with the vinyl molar content of 0.22 percent, 0.5 part of methyl vinyl raw rubber with the vinyl molar content of 4 percent, and the molecular weight of the three raw rubbers is 80-90 ten thousand); except that the vinyl molar contents of the two raw methyl vinyl silicone rubbers are different from those of the raw methyl vinyl silicone rubber in example 5, the weight parts of other components and the preparation method are the same as those of the raw methyl vinyl silicone rubber in example 5, so that the high-tear-strength silicone rubber VI is obtained.
Comparative example 1
The composition of the comparative example does not contain gamma-aminopropyltriethoxysilane and tetramethyltetravinylcyclotetrasiloxane, and the parts by weight of the other components, the preparation method and the compression molding method are the same as those in example 1, thereby obtaining silicone rubber a.
Comparative example 2
The composition of the comparative example did not contain γ -aminopropyltriethoxysilane, and the parts by weight of the other components, the preparation method, and the compression molding method were the same as those of example 1, thereby obtaining silicone rubber B.
Comparative example 3
The composition of the comparative example did not contain tetramethyltetravinylcyclotetrasiloxane, and the parts by weight of the other ingredients, the preparation methods, and the compression molding methods were the same as those in example 1, thereby obtaining silicone rubber C.
Experimental examples for Performance test
Testing the Shore A hardness of the high-tear-strength silicon rubbers I-VI prepared in the examples 1-6 and the silicon rubbers A-C obtained in the comparative examples 1-3 according to GB/T531.1-2008; testing the tensile strength, the elongation at break and the right-angle tearing strength according to GB/T528-; the test results are shown in Table 1.
Table 1 results of performance testing
| Test item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Shore A hardness (degree) | 53 | 55 | 48 | 45 | 62 | 63 | 51 | 53 | 51 |
| Tensile Strength (MPa) | 9.3 | 9.4 | 10.3 | 10.5 | 8.9 | 9.2 | 9.93 | 8.25 | 9.5 |
| Elongation at Break (%) | 643.1 | 658 | 698 | 703 | 583 | 621 | 421.2 | 432 | 512 |
| Tear Strength (KN/m) | 50.42 | 53.5 | 51 | 52.5 | 52 | 53.3 | 24.46 | 31.2 | 26.8 |
As can be seen from the performance test data in table 1:
1) compared with the high-tear-strength silicone rubber in patent CN106589964A, the high-tear-strength silicone rubbers I to VI prepared in examples 1 to 6 not only have remarkably improved tear strength which is more than 50KN/m, but also have higher tensile strength of more than 8.5MPa and elongation at break of more than 550%.
2) The differences between comparative example 1 and example 1 are that no gamma-aminopropyltriethoxysilane or tetramethyltetravinylcyclotetrasiloxane is added, between comparative example 2 and example 1, only gamma-aminopropyltriethoxysilane is added, and between comparative example 3 and example 1, only tetramethyltetravinylcyclotetrasiloxane is added, so that the silicone rubbers A-C obtained by comparative examples 1-3 have not only much lower tear strength than example 1, but also significantly lower elongation at break.
In conclusion, the invention provides a concentrated crosslinking point by adding the tetramethyltetravinylcyclotetrasiloxane, can promote the dispersion of the white carbon black by adding the gamma-aminopropyltriethoxysilane, and can neutralize an acidic byproduct generated by the general vulcanizing agent 2, 4-dichloroperoxybenzoyl during vulcanization, thereby obviously improving the tearing strength of the silicon rubber, having better elongation at break and further expanding and meeting the requirements of the silicon rubber application field.
The above-described embodiments are merely intended to better illustrate the present invention and should not be construed as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. based on the above-described embodiments of the present invention are intended to fall within the scope of the present invention.
Claims (7)
1. The high-tear-strength silicone rubber is characterized in that: the composition comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber crude rubber, 30-60 parts of white carbon black, 0.3-0.5 part of gamma-aminopropyltriethoxysilane, 0.3-1 part of tetramethyl tetravinylcyclotetrasiloxane, 3-10 parts of hydroxyl silicone oil and 1-2.5 parts of 2, 4-dichloro benzoyl peroxide vulcanizing agent.
2. The high tear strength silicone rubber according to claim 1, wherein: the raw methyl vinyl silicone rubber is prepared by mixing raw methyl vinyl silicone rubber A, raw methyl vinyl silicone rubber B and raw methyl vinyl silicone rubber C in parts by weight;
wherein, the raw methyl vinyl silicone rubber A accounts for 60-90 parts, the raw methyl vinyl silicone rubber B accounts for 9-40 parts, and the raw methyl vinyl silicone rubber C accounts for 0-1 part.
3. The high tear strength silicone rubber according to claim 2, wherein: the molecular weight of the raw methyl vinyl silicone rubber A is 60-90 ten thousand, wherein the molar content of vinyl is 0.03-0.08%; the molecular weight of the raw methyl vinyl silicone rubber B is 60-90 ten thousand, wherein the molar content of vinyl is 0.16-0.22%; the molecular weight of the raw methyl vinyl silicone rubber C is 60-90 ten thousand, wherein the molar content of vinyl is 1-5%.
4. According to the claimsThe high-tear-strength silicone rubber obtained in claim 1 is characterized in that: the specific surface area of the white carbon black is 180-400 m 2 /g。
5. The high tear strength silicone rubber according to claim 1, wherein: the viscosity of the hydroxyl silicone oil is 50-1000 cs.
6. A method for preparing the high tear strength silicone rubber of claim 1, wherein: the method comprises the following steps:
A. putting raw methyl vinyl silicone rubber and hydroxyl silicone oil into a kneading machine;
B. adding white carbon black and gamma-aminopropyltriethoxysilane into the kneading machine in the step A in batches, controlling the mixing temperature to be 130-180 ℃, mixing into a mass, continuing stirring for 1-4 hours, and vacuumizing to obtain a mixing base rubber;
C. b, taking the mixed base rubber in the step B out of the pot, cooling, and adding tetramethyl tetravinylcyclotetrasiloxane and a vulcanizing agent on a double roller to obtain a vulcanizing agent-containing mixed rubber;
D. and C, molding the mixed rubber containing the vulcanizing agent in the step C for 10-15 minutes at the temperature of 160-180 ℃ to obtain primary vulcanized silicone rubber, and performing secondary vulcanization on the primary vulcanized silicone rubber at the temperature of 180-220 ℃ for 1-5 hours to obtain the high-tear-strength silicone rubber.
7. The method for preparing a high tear strength silicone rubber according to claim 6, characterized in that: in the step B, adding the white carbon black and the gamma-aminopropyltriethoxysilane into the kneader in the step A in 2-4 batches, wherein the feeding time interval is 20-45 minutes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116041961A (en) * | 2023-02-06 | 2023-05-02 | 上海润平电子材料有限公司 | Silica gel composite material and preparation method and application thereof |
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| CN101157801A (en) * | 2007-09-19 | 2008-04-09 | 上海回天化工新材料有限公司 | Highly ripping-resistant high temperature sulfidation silicon rubber and method for making same |
| CN108059833A (en) * | 2017-12-07 | 2018-05-22 | 常州市沃兰特电子有限公司 | A kind of preparation method of high tear type cable sheath insulation material |
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| JP2006070207A (en) * | 2004-09-03 | 2006-03-16 | Fukoku Co Ltd | Manufacturing method of silicone rubber and silicone rubber composition |
| CN101157801A (en) * | 2007-09-19 | 2008-04-09 | 上海回天化工新材料有限公司 | Highly ripping-resistant high temperature sulfidation silicon rubber and method for making same |
| CN108059833A (en) * | 2017-12-07 | 2018-05-22 | 常州市沃兰特电子有限公司 | A kind of preparation method of high tear type cable sheath insulation material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116041961A (en) * | 2023-02-06 | 2023-05-02 | 上海润平电子材料有限公司 | Silica gel composite material and preparation method and application thereof |
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