Synthesis method of methyl phenyl silicone rubber vulcanizate

Abstract

The present invention relates to a synthesis method of sulfurated methylphenyl silicone rubber, belonging to the field of preparation of polymer materials. In the present invention, α,ω-dihydroxypolydimethyldiphenylsiloxane with a high phenyl content and low polymerization degree, dimethylcyclosiloxane, and a basic resin catalyst are added to a reaction kettle, and stirred and heated for reaction; after the reaction is completed, low-boiling substances are removed under vacuum to obtain sulfurated methylphenyl silicone rubber; in the present invention, guanidine-doped D201 ion exchange resin is obtained through D201 ion exchange resin (quaternary ammonium salt type), 1-allylcyclopropanesulfonyl chloride, zinc chloride, bis(1-vinylimidazol-2-yl) ketone, mercaptoethylguanidine dihydrobromide, triethylamine, and dichloromethane; the guanidine-doped D201 ion exchange resin is loaded into an ion exchange column for transformation to obtain a basic resin catalyst; the sulfurated methylphenyl silicone rubber prepared by the present invention has excellent mechanical properties.

Description

Technical Field

[0001] The present invention relates to the field of polymer material preparation, and particularly to a synthesis method of vulcanized methylphenyl silicone rubber. Background Art

[0002] Silicone rubber is one of the most important products of polysiloxane. Vulcanized methylphenyl silicone rubber has excellent weather resistance, high and low temperature resistance, damping property, chemical resistance, etc., and thus has wide applications in the fields of aerospace, electronics and electrical engineering, automobiles, etc.

[0003] Chinese Patent CN101851334A: It relates to the fields of new materials and fine chemicals (special polymer materials), and specifically to a high-temperature-resistant dimethyldiphenyl room-temperature vulcanized silicone rubber, its production process and uses. It is characterized in that the following four raw materials are used for synthesis, and the content ratio by weight of the formula % is: (1) liquid dimethyldiphenyl mixed cyclic siloxane 20.0 - 34.0%, (2) dimethyl cyclic siloxane 65.58 - 79.89%, (3) water 0.10 - 0.40%, (4) tetramethylammonium hydroxide 0.008 - 0.015%.

[0004] Chinese Patent CN111518132A: It provides a preparation method of methylphenyl mixed ring bodies and a preparation method of methylphenyl silicone rubber. The preparation method of the methylphenyl mixed ring bodies includes: catalytic cracking and rearrangement of polymethylphenylsiloxane, and then stepwise reduced-pressure fractionation. The preparation method of the methylphenyl silicone rubber includes: 1) obtaining methylphenyl mixed ring bodies by using the preparation method of methylphenyl mixed ring bodies; 2) water-capped polymerization of one or more methylphenyl mixed ring bodies obtained in step 1) and octamethylcyclotetrasiloxane under the action of a catalyst.

[0005] Chinese Patent CN111454453A: It relates to a production process for preparing room-temperature vulcanized phenyl silicone rubber raw rubber, including: a step of polymerizing reaction raw materials to polymerize raw materials including diphenyldialkoxysilane and dimethyldialkoxysilane; a first vacuum treatment step to vacuum-remove low-boiling components from the polymerized product; a second vacuum treatment step to further remove low-boiling components from the product of the first vacuum treatment, wherein the purity of the diphenyldialkoxysilane and dimethyldialkoxysilane is above 99.99%, the temperature of the first vacuum treatment is 170 - 190°C, the pressure is below 200 Pa, the temperature of the second vacuum treatment is below 200°C, and the pressure is below 100 Pa.

[0006] For the vulcanized methylphenyl silicone rubber prepared by the above patents and the prior art, the mechanical properties need to be further improved. Summary of the Invention

[0007] To solve the above problems, the present invention provides a method for synthesizing methylphenyl silicone rubber by vulcanization, and its operation steps are as follows:

[0008] S1: According to parts by weight, add 80 - 100 parts of α,ω-dihydroxypolydimethyldiphenylsiloxane with high phenyl content and low polymerization degree, 30 - 400 parts of dimethylcyclosiloxane, and 0.2 - 1 part of basic resin catalyst into the reaction kettle, and stir and heat up for reaction;

[0009] S2: After the reaction is completed, vacuum out the low-boiling substances to obtain room-temperature vulcanized methylphenyl silicone rubber.

[0010] The dimethylcyclosiloxane is a mixture of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and the content of octamethylcyclotetrasiloxane is not less than 75%.

[0011] The reaction temperature of S1 is 105 - 115 °C, and the time is 4 - 6 h.

[0012] The vacuum degree of S2 is -0.09 to -0.095 MPa, and the temperature is 180 - 190 °C.

[0013] The preparation method of the α,ω-dihydroxypolydimethyldiphenylsiloxane with high phenyl content and low polymerization degree is as follows:

[0014] A1: Add 120 - 148 parts of dimethyldimethoxysilane, 180 - 216 parts of diphenyldihydroxysilane, and 0.01 - 0.02 parts of hydrochloric acid into the reaction kettle, and react at 60 - 80 °C for 3 - 5 h;

[0015] A2: After the reaction is completed, add 20 - 30 parts of water and carry out hydrolysis reaction for 2 - 4 h;

[0016] A3: After hydrolysis, add sodium hydroxide, adjust the pH value to neutral, and then distill off the by-product alcohol and excessive water to obtain α,ω-dihydroxypolydimethyldiphenylsiloxane with high phenyl content and low polymerization degree.

[0017] The preparation method of the basic resin catalyst includes the following steps, all calculated according to parts by mass:

[0018] K1: Add 100 - 140 parts of D201 ion exchange resin (quaternary ammonium salt type), 1000 - 1200 parts of 1-allylcyclopropanesulfonyl chloride CAS No.: 923032-59-1, and 2 - 5 parts of zinc chloride into the stirring kettle 1, and stir and react at 30 - 50 °C for 3 - 6 hours; filter, wash with water, and dry to obtain D201 ion exchange resin containing allyl;

[0019] K2: Add 0.03 - 0.3 parts of bis(1 - vinylimidazol - 2 -) ketone (CAS No.: 168322 - 10 - 9), 10 - 15 parts of 2 - mercaptoethylguanidine dihydrobromide (CAS No.: 32665 - 11 - 5), 2 - 5 parts of triethylamine, and 1000 - 1200 parts of dichloromethane into the stirring kettle 2, and stir and react at 60 - 70 °C for 50 - 100 minutes; then add 100 - 200 parts of allyl - containing D201 ion - exchange resin, and stir and react at 60 - 70 °C for 100 - 150 minutes; filter and dry to obtain guanidine - doped D201 ion - exchange resin (quaternary ammonium salt type);

[0020] K3: Load the guanidine - doped D201 ion - exchange resin and sodium hydroxide into the ion - exchange column for transformation to obtain hydroxide - type guanidine - doped D201 ion - exchange resin (quaternary ammonium salt type), that is, the basic resin catalyst.

[0021] In K3, the resin volume accounts for 25 - 32% of the ion - exchange column volume; the addition amount of sodium hydroxide is 2 - 4 times the resin volume, the mass concentration of sodium hydroxide is 5 - 10%; the contact time is 50 - 100 minutes; the positive flushing flow rate is 10 - 20 m / h.

[0022] Reaction mechanism

[0023] Bis(1 - vinylimidazol - 2 -) ketone and 2 - mercaptoethylguanidine dihydrobromide undergo a thiol - vinyl addition reaction, and then continue to undergo a thiol or amino - allyl addition reaction with allyl - containing D201 ion - exchange resin to obtain D201 ion - exchange resin loaded with guanidyl and imidazolyl groups, and then obtain the hydroxide - type resin through transformation.

[0024] The D201 ion - exchange resin loaded with guanidyl and imidazolyl groups is used as a basic catalyst, and its catalytic mechanism involves the following aspects:

[0025] Guanidyl and imidazolyl groups have strong basicity and can accept protons to form stable intermediates. In the hydrolysis reaction, these basic sites can attract and stabilize the protons in water molecules, making it easier for water molecules to undergo nucleophilic attack, thus promoting the hydrolysis of the silicon - oxygen bond.

[0026] The D201 ion - exchange resin has a large specific surface area and pore structure, which helps the reactant molecules to fully contact on the catalyst surface and improve the reaction efficiency. At the same time, the loaded guanidyl and imidazolyl groups may be located at specific positions of the resin, forming a spatial configuration favorable for the reaction.

[0027] Synergistic effect: Guanidyl and imidazolyl groups may enhance the activity of the catalyst through synergistic effects. For example, one basic site may first stabilize a proton in a water molecule, and the other site may assist in completing the subsequent proton transfer or electron transfer process.

[0028] Technical effects

[0029] A synthesis method of vulcanized methylphenyl silicone rubber. Compared with the prior art, the present invention has the following remarkable effects:

[0030] Using D201 ion exchange resin loaded with guanidine group and imidazole group as a catalyst can achieve efficient hydrolysis of α,ω-dihydroxypolydimethyl diphenyl siloxane and dimethyl cyclosiloxane. This catalyst not only has high catalytic activity, but also has good stability and reusability. In addition, since the catalyst is in solid form, it is convenient to separate and recycle from the reaction system, reducing production costs and environmental burden.

[0031] In summary, D201 ion exchange resin loaded with guanidine group and imidazole group as a basic catalyst for the hydrolysis of α,ω-dihydroxypolydimethyl diphenyl siloxane and dimethyl cyclosiloxane has the advantages of high efficiency, stability and reusability in technology. Specific embodiments

[0032] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description in combination with examples and comparative examples:

[0033] Tensile strength and elongation at break: Tested with reference to GB / T528—2009, and the test results are shown in Table 1.

[0034] Example 1

[0035] A synthesis method of vulcanized methylphenyl silicone rubber, and its operation steps are as follows:

[0036] S1: Add 80 g of α,ω-dihydroxypolydimethyl diphenyl siloxane with high phenyl content and low polymerization degree, 30 g of dimethyl cyclosiloxane, and 0.2 g of basic resin catalyst into the reaction kettle, stir and heat up for reaction;

[0037] S2: After the reaction is completed, vacuum out the low-boiling substances to obtain room-temperature vulcanized methylphenyl silicone rubber.

[0038] The dimethyl cyclosiloxane is a mixture of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and the content of octamethylcyclotetrasiloxane is not less than 75%.

[0039] The reaction temperature of S1 is 105 °C and the time is 4 h.

[0040] The vacuum degree of S2 is -0.09 MPa and the temperature is 180 °C.

[0041] The preparation method of the α,ω-dihydroxypolydimethyldiphenylsiloxane with high phenyl content and low degree of polymerization is as follows:

[0042] A1: Add 120 g of dimethyldimethoxysilane, 180 g of diphenyldihydroxysilane, and 0.01 g of hydrochloric acid into a reaction kettle, and react at 60 °C for 3 h;

[0043] A2: After the reaction is completed, add 20 g of water and carry out hydrolysis reaction for 2 h;

[0044] A3: After hydrolysis, add sodium hydroxide, adjust the pH value to neutral, and then distill off the by-product alcohol and excessive water to obtain the α,ω-dihydroxypolydimethyldiphenylsiloxane with high phenyl content and low degree of polymerization.

[0045] The preparation method of the basic resin catalyst includes the following steps, all calculated by mass: K1: Add 100 g of D201 ion exchange resin (quaternary ammonium salt type), 1000 g of 1-allylcyclopropanesulfonyl chloride CAS No.: 923032-59-1, and 2 g of zinc chloride into a stirring kettle 1, and stir and react at 30 °C for 3 hours; filter, wash with water, and dry to obtain the allyl-containing D201 ion exchange resin;

[0046] K2: Add 0.03 g of bis(1-vinylimidazol-2-yl)ketone CAS No.: 168322-10-9, 10 g of 2-mercaptoethylguanidine dihydrobromide CAS No.: 32665-11-5, 2 g of triethylamine, and 1000 g of dichloromethane into a stirring kettle 2, and stir and react at 60 °C for 50 minutes; then add 100 g of the allyl-containing D201 ion exchange resin, and stir and react at 60 °C for 100 minutes; filter and dry to obtain the guanidine-doped D201 ion exchange resin (quaternary ammonium salt type);

[0047] K3: Load the guanidine-doped D201 ion exchange resin and sodium hydroxide into an ion exchange column for transformation to obtain the hydroxide-type guanidine-doped D201 ion exchange resin (quaternary ammonium salt type), that is, the basic resin catalyst.

[0048] The resin volume in K3 accounts for 25% of the ion exchange column volume; the addition amount of sodium hydroxide is 2 times the resin volume, the mass concentration of sodium hydroxide is 5%; the contact time is 50 minutes; the positive washing flow rate is 10 m / h.

[0049] Example 2

[0050] A synthesis method of vulcanized methyl phenyl silicone rubber, and its operation steps are as follows:

[0051] S1: Add 85 g of α,ω-dihydroxypolydimethyldiphenylsiloxane with a high phenyl content and low degree of polymerization, 100 g of dimethylcyclosiloxane, and 0.4 g of basic resin catalyst into a reaction kettle, and stir and heat up for reaction;

[0052] S2: After the reaction is completed, remove the low boilers under vacuum to obtain room temperature vulcanized methyl phenyl silicone rubber.

[0053] The dimethylcyclosiloxane is a mixture of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and the content of octamethylcyclotetrasiloxane is not less than 75%.

[0054] The reaction temperature of S1 is 110 °C and the time is 5 h.

[0055] The vacuum degree of S2 is -0.09 MPa and the temperature is 185 °C.

[0056] The preparation method of the α,ω-dihydroxypolydimethyldiphenylsiloxane with a high phenyl content and low degree of polymerization is as follows:

[0057] A1: Add 130 g of dimethyldimethoxysilane, 190 g of diphenyldihydroxysilane, and 0.015 g of hydrochloric acid into a reaction kettle, and react at 65 °C for 4 h;

[0058] A2: After the reaction is completed, add 24 g of water and carry out hydrolysis reaction for 3 h;

[0059] A3: After hydrolysis, add sodium hydroxide, adjust the pH value to neutral, and then distill off the by-product alcohol and excessive water to obtain α,ω-dihydroxypolydimethyldiphenylsiloxane with a high phenyl content and low degree of polymerization.

[0060] The preparation method of the basic resin catalyst includes the following steps, all calculated by mass: K1: Add 110 g of D201 ion exchange resin (quaternary ammonium salt type), 1050 g of 1-allylcyclopropanesulfonyl chloride CAS No.: 923032-59-1, and 3 g of zinc chloride into stirring kettle 1, and stir and react at 35 °C for 4 hours; filter, wash with water, and dry to obtain allyl-containing D201 ion exchange resin;

[0061] K2: Add 0.1 g of bis(1-vinylimidazol-2-yl) ketone CAS No.: 168322-10-9, 12 g of 2-mercaptoethylguanidine dihydrobromide CAS No.: 32665-11-5, 3 g of triethylamine, and 1050 g of dichloromethane into stirring kettle 2, and stir and react at 65 °C for 60 minutes; then add 140 g of allyl-containing D201 ion exchange resin, and stir and react at 65 °C for 110 minutes; filter and dry to obtain guanidine-doped D201 ion exchange resin (quaternary ammonium salt type);

[0062] K3: Load the guanidine-doped D201 ion exchange resin and sodium hydroxide into an ion exchange column for transformation to obtain a hydroxide-form guanidine-doped D201 ion exchange resin (quaternary ammonium salt type), i.e., an alkaline resin catalyst.

[0063] In K3, the resin volume accounts for 27% of the ion exchange column volume; the addition amount of sodium hydroxide is 3 times the resin volume, the mass concentration of sodium hydroxide is 6%; the contact time is 70 minutes; the normal washing flow rate is 14 m / h.

[0064] Example 3

[0065] A method for synthesizing methyl phenyl silicone rubber by vulcanization, the operation steps of which are as follows:

[0066] S1: Add 95 g of α,ω-dihydroxypolydimethyldiphenylsiloxane with a high phenyl content and low degree of polymerization, 300 g of dimethylcyclosiloxane, and 0.8 g of alkaline resin catalyst to a reaction kettle, stir and heat up for reaction;

[0067] S2: After the reaction is completed, vacuum out the low-boiling substances to obtain room-temperature vulcanized methyl phenyl silicone rubber.

[0068] The dimethylcyclosiloxane is a mixture of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and the content of octamethylcyclotetrasiloxane is not less than 75%.

[0069] The reaction temperature in S1 is 110 °C and the time is 5 h.

[0070] The vacuum degree in S2 is -0.095 MPa and the temperature is 185 °C.

[0071] The preparation method of the α,ω-dihydroxypolydimethyldiphenylsiloxane with a high phenyl content and low degree of polymerization is as follows:

[0072] A1: Add 140 g of dimethyldimethoxysilane, 200 g of diphenyldihydroxysilane, and 0.015 g of hydrochloric acid to a reaction kettle, and react at 75 °C for 4 h;

[0073] A2: After the reaction is completed, add 28 g of water and carry out hydrolysis reaction for 3 h;

[0074] A3: After hydrolysis, add sodium hydroxide, adjust the pH value to neutral, and then distill off the by-product alcohol and excessive water to obtain the α,ω-dihydroxypolydimethyldiphenylsiloxane with a high phenyl content and low degree of polymerization.

[0075] The preparation method of the described basic resin catalyst comprises the following steps, all calculated by mass parts: K1: Add 130 g of D201 ion exchange resin (quaternary ammonium salt type), 1150 g of 1-allylcyclopropanesulfonyl chloride (CAS No.: 923032-59-1), and 4 g of zinc chloride into the stirring kettle 1, and stir and react at 45 °C for 5 hours; filter, wash with water, and dry to obtain the allyl-containing D201 ion exchange resin;

[0076] K2: Add 0.2 g of bis(1-vinylimidazol-2-yl)ketone (CAS No.: 168322-10-9), 14 g of 2-mercaptoethylguanidine dihydrobromide (CAS No.: 32665-11-5), 4 g of triethylamine, and 1150 g of dichloromethane into the stirring kettle 2, and stir and react at 65 °C for 90 minutes; then add 180 g of the allyl-containing D201 ion exchange resin, and stir and react at 65 °C for 140 minutes; filter and dry to obtain the guanidine-doped D201 ion exchange resin (quaternary ammonium salt type);

[0077] K3: Load the guanidine-doped D201 ion exchange resin and sodium hydroxide into the ion exchange column for transformation to obtain the hydroxide-type guanidine-doped D201 ion exchange resin (quaternary ammonium salt type), namely the basic resin catalyst.

[0078] The resin volume in K3 accounts for 30% of the ion exchange column volume; the addition amount of sodium hydroxide is 3 times the resin volume, the mass concentration of sodium hydroxide is 8%; the contact time is 90 minutes; the normal washing flow rate is 18 m / h.

[0079] Example 4

[0080] A synthesis method of sulfurized methylphenyl silicone rubber, and its operation steps are as follows:

[0081] S1: Add 100 g of α,ω-dihydroxypolydimethyl diphenylsiloxane with high phenyl content and low polymerization degree, 400 g of dimethylcyclosiloxane, and 1 g of basic resin catalyst into the reaction kettle, and stir and heat up for reaction;

[0082] S2: After the reaction ends, vacuum out the low-boiling substances to obtain room temperature vulcanized methylphenyl silicone rubber.

[0083] The described dimethylcyclosiloxane is a mixture of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and the content of octamethylcyclotetrasiloxane is not less than 75%.

[0084] The reaction temperature in S1 is 115 °C and the time is 6 h.

[0085] The vacuum degree in S2 is -0.095 MPa and the temperature is 190 °C.

[0086] The preparation method of the α,ω-dihydroxypolydimethyldiphenylsiloxane with a high phenyl content and a low degree of polymerization is as follows:

[0087] A1: Add 148 g of dimethyldimethoxysilane, 216 g of diphenyldihydroxysilane, and 0.02 g of hydrochloric acid into a reaction kettle, and react at 80 °C for 5 h;

[0088] A2: After the reaction is completed, add 30 g of water and carry out a hydrolysis reaction for 4 h;

[0089] A3: After hydrolysis, add sodium hydroxide, adjust the pH value to neutral, and then distill off the by-product alcohol and excessive water to obtain the α,ω-dihydroxypolydimethyldiphenylsiloxane with a high phenyl content and a low degree of polymerization.

[0090] The preparation method of the basic resin catalyst includes the following steps, all calculated by mass: K1: Add 140 g of D201 ion exchange resin (quaternary ammonium salt type), 1200 g of 1-allylcyclopropanesulfonyl chloride CAS No.: 923032-59-1, and 5 g of zinc chloride into stirring kettle 1, and stir and react at 50 °C for 6 hours; filter, wash with water, and dry to obtain the allyl-containing D201 ion exchange resin;

[0091] K2: Add 0.3 g of bis(1-vinylimidazol-2-yl)ketone CAS No.: 168322-10-9, 15 g of 2-mercaptoethylguanidine dihydrobromide CAS No.: 32665-11-5, 5 g of triethylamine, and 1200 g of dichloromethane into stirring kettle 2, and stir and react at 70 °C for 100 minutes; then add 200 g of the allyl-containing D201 ion exchange resin, and stir and react at 70 °C for 150 minutes; filter and dry to obtain the guanidine-doped D201 ion exchange resin (quaternary ammonium salt type);

[0092] K3: Load the guanidine-doped D201 ion exchange resin and sodium hydroxide into an ion exchange column for transformation to obtain the hydroxide-type guanidine-doped D201 ion exchange resin (quaternary ammonium salt type), that is, the basic resin catalyst.

[0093] In K3, the resin volume accounts for 32% of the ion exchange column volume; the addition amount of sodium hydroxide is 4 times the resin volume, the mass concentration of sodium hydroxide is 10%; the contact time is 100 minutes; the normal washing flow rate is 20 m / h.

[0094] Comparative Example 1

[0095] Do not add the basic resin catalyst, add D201 ion exchange resin (quaternary ammonium salt type), and the others are the same as in Example 1.

[0096] Comparative Example 2

[0097] Without adding bis(1-vinylimidazol-2-yl)ketone, and the other conditions are the same as in Example 1.

[0098] Comparative Example 3

[0099] Without adding allyl cyclopropylsulfonyl chloride, and the other conditions are the same as in Example 1.

[0100] Table 1

[0101] Tensile strength / Mpa Elongation at break / % Example 1 4.69 663 Example 2 4.73 671 Example 3 4.78 679 Example 4 4.85 687 Comparative Example 1 3.04 412 Comparative Example 2 4.09 584 Comparative Example 3 4.23 596

[0102] Through the data analysis of the above examples and comparative examples, the sulfurized methyl phenyl silicone rubber prepared by the present invention has excellent mechanical properties.

[0103] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A synthesis method of sulfurized methylphenyl silicone rubber, and its operation steps are as follows: S1: According to parts by weight, add 80 - 100 parts of α,ω-dihydroxypolydimethyldiphenylsiloxane with high phenyl content and low polymerization degree, 30 - 400 parts of dimethylcyclosiloxane, and 0.2 - 1 part of basic resin catalyst into a reaction kettle, stir and heat up for reaction; S2: After the reaction ends, vacuum out the low-boiling substances to obtain sulfurized methylphenyl silicone rubber; The basic resin is obtained by reacting allyl-containing D201 ion exchange resin, bis(1-vinylimidazol-2-yl) ketone, and mercaptoethylguanidine dihydrobromide to obtain guanidine-doped D201 ion exchange resin, and then loading it into an ion exchange column with sodium hydroxide for transformation to obtain hydroxide-type guanidine-doped D201 ion exchange resin, that is, the basic resin catalyst.

2. The synthesis method of a sulfurized methylphenyl silicone rubber according to claim 1, characterized in that: The dimethylcyclosiloxane is a mixture of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and the content of octamethylcyclotetrasiloxane is not less than 75%.

3. The synthesis method of a sulfurized methylphenyl silicone rubber according to claim 1, characterized in that: The reaction temperature of S1 is 105 - 115 °C, and the time is 4 - 6 h.

4. The synthesis method of a sulfurized methylphenyl silicone rubber according to claim 1, characterized in that: The vacuum degree of S2 is -0.09 to -0.095 MPa, and the temperature is 180 - 190 °C.

5. The synthesis method of a sulfurized methyl phenyl silicone rubber according to claim 1, characterized in that: The preparation method of the α,ω-dihydroxypolydimethyldiphenylsiloxane with high phenyl content and low polymerization degree is as follows: A1: Add 120 - 148 parts of dimethyldimethoxysilane, 180 - 216 parts of diphenyldihydroxysilane, and 0.01 - 0.02 parts of hydrochloric acid into a reaction kettle, and react at 60 - 80 °C for 3 - 5 h; A2: After the reaction ends, add 20 - 30 parts of water and carry out hydrolysis reaction for 2 - 4 h; A3: After hydrolysis, add sodium hydroxide, adjust the pH value to neutral, and then distill off the by-product alcohol and excessive water to obtain α,ω-dihydroxypolydimethyldiphenylsiloxane with high phenyl content and low polymerization degree.

6. The synthesis method of a sulfurized methylphenyl silicone rubber according to claim 1, wherein: The preparation method of the basic resin catalyst includes the following steps: all according to parts by mass: K1: Add 100 - 140 parts of D201 ion exchange resin, 1000 - 1200 parts of 1-allylcyclopropanesulfonyl chloride, and 2 - 5 parts of zinc chloride into stirring kettle 1, stir and react at 30 - 50 °C for 3 - 6 hours; filter, wash with water, and dry to obtain allyl-containing D201 ion exchange resin; K2: Add 0.03 - 0.3 parts of bis(1-vinylimidazol-2-yl) ketone, 10 - 15 parts of mercaptoethylguanidine dihydrobromide, 2 - 5 parts of triethylamine, and 1000 - 1200 parts of dichloromethane into stirring kettle 2, stir and react at 60 - 70 °C for 50 - 100 minutes; then add 100 - 200 parts of allyl-containing D201 ion exchange resin, stir and react at 60 - 70 °C for 100 - 150 minutes; filter and dry to obtain guanidine-doped D201 ion exchange resin; K3: Load the guanidine-doped D201 ion exchange resin and sodium hydroxide into an ion exchange column for transformation to obtain hydroxide-type guanidine-doped D201 ion exchange resin, that is, the basic resin catalyst.

7. The synthesis method of a sulfurized methylphenyl silicone rubber according to claim 6, characterized in that: The resin volume of K3 accounts for 25-32% of the volume of the ion exchange column; the addition amount of sodium hydroxide is 2-4 times the resin volume, and the mass concentration of sodium hydroxide is 5-10%; the contact time is 50-100 minutes; the forward washing flow rate is 10-20 m / h.