A high heat-resistant rubber release agent and preparation method thereof

Abstract

The present application relates to the technical field of rubber processing release agents, and more specifically, it relates to a high heat-resistant rubber release agent and a preparation method thereof. A high heat-resistant rubber release agent comprises the following raw materials in parts by weight: 20-30 parts of bifunctional polysilsesquioxane-fluorine-containing phenolic resin, 2-4 parts of vinyl polysiloxane, 0.005-0.05 parts of initiator, 0.0001-0.001 parts of inhibitor, 100-300 parts of organic solvent, the fluorine-containing phenolic resin contains tetrafluorophenyl, and the bifunctional polysilsesquioxane contains amino and mercapto. The high heat-resistant rubber release agent of the present application has excellent high temperature resistance, film-forming performance, wear resistance and strong adhesion to the mold.

Description

Technical Field

[0001] The present application relates to the technical field of mold release agents for rubber processing, and more specifically, to a highly heat-resistant rubber mold release agent and a preparation method thereof. Background Art

[0002] A release agent is a functional substance between the mold and the finished product. It has a low surface tension and can form a complete coating to act on the surfaces of two easily sticky objects, such as the interface between a metal mold and a resin-based composite product. It can make the surface of the composite product smooth and easy to demold, thus assisting in completing the entire product molding process.

[0003] At present, the common release agents in China are mainly wax-based, silicone-based and organic fluorine-based. Among them, wax-based release agents have poor performance and are inconvenient to use; organic fluorine-based release agents have extremely good performance, but are relatively expensive, while silicone-based release agents are widely used, have relatively good performance, and are relatively cheap, so they are relatively better.

[0004] However, the heat resistance of silicone-based release agents is insufficient, and they may carbonize and decompose when heated, which in turn affects the service life of the mold. Therefore, there is an urgent need for a highly heat-resistant silicone-based rubber release agent. Summary of the invention

[0005] In order to improve the defect of relatively insufficient heat resistance of conventional silicone rubber release agents, the present application provides a high heat-resistant rubber release agent and a preparation method thereof.

[0006] In the first aspect, the present application provides a high heat-resistant rubber release agent, which adopts the following technical solution:

[0007] A high heat-resistant rubber release agent comprises the following raw materials in parts by weight: 20-30 parts of bifunctional polysilsesquioxane-fluorine-containing phenolic resin, 2-4 parts of vinyl polysiloxane, 0.005-0.05 parts of initiator, 0.0001-0.001 parts of polymerization inhibitor, and 100-300 parts of organic solvent. The fluorine-containing phenolic resin contains tetrafluorophenyl, and the bifunctional polysilsesquioxane contains amino and mercapto groups.

[0008] In addition to insufficient heat resistance, silicone-based release agents also have relatively poor film-forming properties, that is, they cure slowly and are not easy to form films. In addition, silicone-based release agents have relatively weak adhesion to the mold and are easily worn, which will contaminate the surface of the product and affect the subsequent painting or electroplating process of the finished product.

[0009] The fluorine-containing phenolic resin has a strong carbon-fluorine bond strength, which enables the coating to exhibit excellent high temperature resistance at high temperatures. The addition of phenolic resin can effectively increase the adhesion between the coating and the mold, thereby extending the service life of the coating film and improving the demolding ability, thereby enabling the prepared coating to have better high temperature resistance and adhesion.

[0010] The microstructure of bifunctional polysilsesquioxane is a regular cage-like geometric structure, which enables the coating surface to present irregular nanoscale micro-protrusions, thereby producing a lotus leaf effect and further improving the coating's demolding effect.

[0011] At the same time, since the bifunctional polysilsesquioxane contains both amino and mercapto groups, the amino group can react with the phenolic functional group in the phenolic resin, thereby connecting the bifunctional polysilsesquioxane to the phenolic resin matrix; and for the mercapto group, since the molding temperature of rubber is generally between 120-180°C, at this temperature, the mercapto group can react with the vinyl group in the vinyl polysiloxane under the action of an initiator to rapidly undergo a mercapto-double bond addition curing reaction, thereby forming a multi-cross-linked grid coating, thereby improving the wear resistance of the coating, and at the same time, due to the supplementation of polar groups, a strong complexation is formed between the coating and the mold, effectively improving the adsorption performance of the coating and the mold.

[0012] In summary, when the high heat-resistant rubber release agent adopts the above components, the coating formed by curing will have better high temperature resistance, film-forming performance, wear resistance and stronger adhesion to the mold.

[0013] Preferably, the bifunctional polysilsesquioxane-fluorine-containing phenolic resin comprises the following raw materials in parts by mass: 5-7 parts of fluorine-containing phenolic resin, 10-14 parts of 3-aminopropyltrimethoxysilane and 6-8 parts of 3-mercaptopropyltrimethoxysilane.

[0014] Preferably, the preparation method of the bifunctional polysilsesquioxane-fluorine-containing phenolic resin comprises the following steps:

[0015] A1, adding 6 kg of fluorine-containing phenolic resin to 100 L of tetrahydrofuran and dispersing evenly, then adding 0.6 kg of dicyclohexylcarbodiimide, and then adding a portion of 3-aminopropyltrimethoxysilane, reacting at 25 ° C for 4 hours, then filtering and washing twice with tetrahydrofuran and then washing completely with anhydrous ethanol, and finally drying at a temperature of 60 ° C to obtain a pretreated bifunctional polysilsesquioxane-fluorine-containing phenolic resin;

[0016] A2. Add the pretreated bifunctional polysilsesquioxane-fluorine-containing phenolic resin to 100 L of dimethyl sulfoxide and fully disperse it, then add the remaining 3-aminopropyltrimethoxysilane and 7 kg 3-mercaptopropyltrimethoxysilane, heat and stir at 60 ° C for 12 h, then cool to room temperature and add 0.3 kg ammonium fluoride while stirring, continue stirring at room temperature for 24 h, and finally age at 80 ° C for 7 days, finally cool, filter, wash and dry to obtain a bifunctional polysilsesquioxane-fluorine-containing phenolic resin.

[0017] In A1, a portion of 3-aminopropyltrimethoxysilane is first reacted with the fluorine-containing phenolic resin, thereby promoting the complete reaction of the phenolic group in the fluorine-containing phenolic resin with the amino group in 3-aminopropyltrimethoxysilane. Then, in A2, the fluorine-containing phenolic resin, 3-aminopropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane obtained after treatment can stably, quickly and completely undergo condensation reaction, thereby promoting the formation of bifunctional polysilsesquioxane-fluorine-containing phenolic resin.

[0018] Preferably, in A1, the amount of 3-aminopropyltrimethoxysilane added is 5 kg, and in A2, the amount of 3-aminopropyltrimethoxysilane added is 7 kg.

[0019] When 3-aminopropyltrimethoxysilane is added in the above amount in the operation steps A1 and A2, the prepared rubber release agent will have better adhesion and wear resistance.

[0020] Preferably, the fluorine-containing phenolic resin comprises the following raw materials in parts by mass: 0.5-1.5 parts of formaldehyde and 8-12 parts of 2,3,5,6-tetrafluorohydroquinone.

[0021] Preferably, the preparation method of the fluorine-containing phenolic resin is: 10kg of 2,3,5,6-tetrafluorohydroquinone and 1kg of formaldehyde are heated and melted by hot water, and then 10kg of tetrahydrofuran is added, and 20wt% zinc chloride solution is added while stirring, and heated to reflux for 6h, and the mixture is allowed to stand for stratification to remove water, and the solvent is distilled off under reduced pressure at 80°C. When the viscosity of the system reaches 70cp / 80°C, the reaction is stopped to obtain the fluorine-containing phenolic resin.

[0022] Preferably, the initiator is azobisisobutyronitrile, the inhibitor is hydroquinone, and the organic solvent is octane.

[0023] In a second aspect, the present application provides a method for preparing a highly heat-resistant rubber release agent, using the following technical solution:

[0024] A method for preparing a high heat-resistant rubber release agent comprises the following steps: mixing a bifunctional polysilsesquioxane-fluorine-containing phenolic resin, vinyl polysiloxane, an initiator, an inhibitor and an organic solvent, and then stirring the mixture evenly to obtain the high heat-resistant rubber release agent.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. Fluorine-containing phenolic resin has a strong carbon-fluorine bond strength, which makes the coating show excellent high temperature resistance at high temperature; the addition of phenolic resin can effectively increase the adhesion between the coating and the mold, thereby extending the service life of the coating film and improving the demolding ability, so that the prepared coating will have better high temperature resistance and adhesion.

[0027] 2. The microstructure of bifunctional polysilsesquioxane is a regular cage-like geometric structure, which enables the coating surface to present irregular nanoscale micro-protrusions, thereby producing a lotus leaf effect and further improving the coating's demolding effect.

[0028] 3. The bifunctional polysilsesquioxane contains both amino and mercapto groups, wherein the amino group can react with the phenolic functional group in the phenolic resin, thereby connecting the bifunctional polysilsesquioxane to the phenolic resin matrix; and for the mercapto group, since the molding temperature of rubber is generally between 120-180°C, at this temperature, the mercapto group can react with the vinyl group in the vinyl polysiloxane under the action of an initiator to rapidly undergo a mercapto-double bond addition curing reaction, thereby forming a multi-cross-linked grid coating, thereby improving the wear resistance of the coating, and at the same time, due to the supplementation of multipolar groups, a strong complexation is formed between the coating and the mold, effectively improving the adsorption performance of the coating and the mold. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with Examples 1-9 and Comparative Examples 1-4.

[0030] Raw materials Vinyl polysiloxane CAS: 53529-60-5; 3-aminopropyltrimethoxysilane CAS: 54761-04-5; 3-mercaptopropyltrimethoxysilane CAS: 31001-77-1; Tetrahydrofuran CAS: 109-99-9; Dicyclohexylcarbodiimide CAS: 538-75-0; Ethanol CAS: 64-17-5; Dimethyl sulfoxide CAS: 67-68-5; Formaldehyde CAS: 50-00-0; 2,3,5,6-tetrafluorohydroquinone CAS: 771-63-1; Zinc chloride CAS: 7646-85-7; Azobisisobutyronitrile CAS: 78-67-1; Hydroquinone CAS: 123-31-9; Octane CAS: 111-65-9; Phenolic resin CAS: 9003-35-4.

[0031] Example

[0032] Example 1

[0033] A high heat-resistant rubber release agent, comprising the following raw materials: 25 kg of bifunctional polysilsesquioxane-fluorine-containing phenolic resin, 3 kg of vinyl polysiloxane, 0.003 kg of azobisisobutyronitrile, 0.0007 kg of hydroquinone and 200 kg of octane;

[0034] The preparation method of the high heat-resistant rubber release agent comprises the following steps: mixing bifunctional polysilsesquioxane-fluorine-containing phenolic resin, vinyl polysiloxane, an initiator, an inhibitor and an organic solvent, and then stirring the mixture evenly to obtain the high heat-resistant rubber release agent.

[0035] The bifunctional polysilsesquioxane-fluorinated phenolic resin comprises the following raw materials: 6 kg fluorinated phenolic resin, 12 kg 3-aminopropyltrimethoxysilane and 7 kg 3-mercaptopropyltrimethoxysilane;

[0036] The preparation method of bifunctional polysilsesquioxane-fluorine-containing phenolic resin comprises the following steps:

[0037] A1, adding 6 kg of fluorine-containing phenolic resin to 100 L of tetrahydrofuran and dispersing evenly, then adding 0.6 kg of dicyclohexylcarbodiimide, and then adding 5 kg of 3-aminopropyltrimethoxysilane, reacting at 25 ° C for 4 hours, then filtering and washing twice with tetrahydrofuran and then washing completely with anhydrous ethanol, and finally drying at a temperature of 60 ° C to obtain a pretreated bifunctional polysilsesquioxane-fluorine-containing phenolic resin;

[0038] A2. Add the pretreated bifunctional polysilsesquioxane-fluorine-containing phenolic resin to 100 L of dimethyl sulfoxide and fully disperse it, then add 7 kg of 3-aminopropyltrimethoxysilane and 7 kg of 3-mercaptopropyltrimethoxysilane, heat and stir at 60 ° C for 12 h, then cool to room temperature and add 0.3 kg of ammonium fluoride while stirring, continue stirring at room temperature for 24 h, and finally age at 80 ° C for 7 days, finally cool, filter, wash and dry to obtain a bifunctional polysilsesquioxane-fluorine-containing phenolic resin.

[0039] The fluorinated phenolic resin includes the following raw materials: 1 kg formaldehyde and 10 kg 2,3,5,6-tetrafluorohydroquinone;

[0040] The preparation method of the fluorine-containing phenolic resin is as follows: 10 kg of 2,3,5,6-tetrafluorohydroquinone and 1 g of formaldehyde are heated and melted by hot water, and then 10 kg of tetrahydrofuran is added, and a 20 wt % zinc chloride solution is added while stirring, and heated under reflux for 6 hours, and the mixture is allowed to stand for stratification to remove water, and the solvent is distilled off under reduced pressure at 80°C. When the viscosity of the system reaches 70cp / 80°C, the reaction is stopped to obtain the fluorine-containing phenolic resin.

[0041] Example 2-3

[0042] The difference from Example 1 is that the addition amounts of the components of the high heat-resistant rubber release agent are different, as shown in Table 1.

[0043] Table 1 Addition amount of each component of the high heat-resistant rubber release agent of Examples 1-3 / kg

[0044]

[0045]

[0046] Embodiment 4-5

[0047] The difference from Example 1 is that the addition amounts of the components of the bifunctional polysilsesquioxane-fluorine-containing phenolic resin are different, as shown in Table 2.

[0048] Table 2 Components of bifunctional polysilsesquioxane-fluorinated phenolic resin in Examples 1, 4-5 / kg

[0049]

[0050] Embodiment 6-7

[0051] The difference from Example 1 is that in the preparation of the bifunctional polysilsesquioxane-fluorine-containing phenolic resin, the added amounts of 3-aminopropyltrimethoxysilane A1 and A2 are different, as shown in Table 3.

[0052] Table 3 Addition amount of 3-aminopropyltrimethoxysilane A1 and A2 in Examples 1, 6-7 / kg

[0053] Example 1 Example 6 Example 7 A1 5 6 4 A2 7 6 8

[0054] Embodiment 8-9

[0055] The difference from Example 1 is that the added amounts of the various components of the fluorine-containing phenolic resin are different, as shown in Table 4.

[0056] Table 4 Addition amount of each component of fluorine-containing phenolic resin in Example 1 and Example 8-9 / kg

[0057]

[0058] Comparative Example

[0059] Comparative Example 1

[0060] A silicone rubber release agent is selected from Longlidian Chemical LLT-R-305.

[0061] Comparative Example 2

[0062] The difference from Example 1 is that in the bifunctional polysilsesquioxane-fluorine-containing phenolic resin, the fluorine-containing phenolic resin is replaced by the phenolic resin with the same added amount.

[0063] Comparative Example 3

[0064] The difference from Example 1 is that the bifunctional polysilsesquioxane-fluorine-containing phenolic resin is replaced with the same amount of mercapto polysilsesquioxane;

[0065] Mercaptopolysilsesquioxane is prepared by hydrolysis and condensation of mercaptopropyltrimethoxysilane as a raw material in the presence of methanol as a solvent and concentrated hydrochloric acid as a catalyst. For the preparation method of mercaptopolysilsesquioxane, please refer to the literature Factors Affecting the Synthesis of Mercaptopolysilsesquioxane, Yuan Gang.

[0066] Comparative Example 4

[0067] The difference from Example 1 is that the bifunctional polysilsesquioxane-fluorine-containing phenolic resin is replaced by a mixture of mercapto polysilsesquioxane and fluorine-containing phenolic resin in the same amount. The mercapto polysilsesquioxane is prepared by hydrolysis and condensation using mercaptopropyltrimethoxysilane as a raw material in the presence of methanol as a solvent and concentrated hydrochloric acid as a catalyst. For the preparation method of mercapto polysilsesquioxane, please refer to the literature Factors Affecting the Synthesis of Mercapto Polysilsesquioxane, Yuan Gang.

[0068] Performance testing

[0069] Detection Methods

[0070] 1. High temperature resistance test

[0071] Three samples were taken from each of Examples 1-9 and Comparative Examples 1-4, and then the samples were tested by a thermogravimetric analyzer-Zhonglu TGA, and the thermal weight loss at 456° C. was recorded and the average value was taken.

[0072] 2. Adhesion performance test

[0073] Three samples were taken from Examples 1-9 and Comparative Examples 1-4 respectively, and then a surface-polished Q235 steel was used to simulate a mold. The Q235 steel was immersed in the sample for one minute and slowly pulled out. After a film was formed on the surface of the Q235 steel, it was placed in an oven at 80°C and dried for 2 hours. This was repeated three times, and the amount of sample adhesion on the Q235 steel was calculated and the average value was taken.

[0074] 3. Wear resistance test

[0075] Three samples were taken from Examples 1-9 and Comparative Examples 1-4, respectively, and the friction coefficients of the samples were then measured according to GB10006, with an experimental speed of 100 mm / min, a stroke of 70 mm, a slider mass of 200 g, and the test data were averaged.

[0076] The test data are shown in Table 5.

[0077] Table 5 Test data table of Examples 1-9 and Comparative Examples 1-4

[0078] Thermal weight loss / % <![CDATA[Adhesion amount (g / cm 2 )]]> Friction coefficient Example 1 4.81 13.98 0.0971 Example 2 5.54 13.34 0.1001 Example 3 4.85 13.10 0.0967 Example 4 4.79 13.70 0.1013 Example 5 4.87 13.61 0.1020 Example 6 4.79 13.57 0.1019 Example 7 4.80 13.51 0.1024 Example 8 4.83 13.97 0.0974 Example 9 4.92 13.96 0.1010 Comparative Example 1 7.34 3.88 0.1612 Comparative Example 2 6.63 13.83 0.0997 Comparative Example 3 6.97 8.11 0.1113 Comparative Example 4 5.91 12.68 0.1029

[0079] Referring to Example 1 and Comparative Examples 1-4 and in combination with Table 5, it can be seen that, relative to Comparative Example 1, the thermal weight loss of Example 1 is significantly reduced, the adhesion amount of Example 1 is significantly increased, and the friction coefficient of Example 1 is significantly reduced. This shows that, relative to conventional silicone rubber release agents, the high heat-resistant rubber release agent of Example 1 has better heat resistance, adhesion ability and wear resistance.

[0080] Compared with Example 1, the thermal weight loss of Example 2 is significantly improved, which shows that, compared with phenolic resin, the use of fluorine-containing phenolic resin can make the high heat-resistant rubber release agent have better heat resistance. The reason is that the fluorine-containing phenolic resin contains a strong carbon-fluorine bond strength, which makes the high heat-resistant rubber release agent show excellent thermal stability, that is, excellent heat resistance.

[0081] Compared with Example 1, the thermal weight loss of Comparative Example 3 is significantly improved, even greater than the thermal weight loss of Comparative Example 2. At the same time, the adhesion amount of Comparative Example 3 is significantly reduced, and the friction coefficient of Comparative Example 3 is significantly improved. This shows that replacing the bifunctional polysilsesquioxane-fluorinated phenolic resin with the same added amount of mercapto polysilsesquioxane will affect the heat resistance, adhesion ability and wear resistance of the high heat-resistant rubber release agent.

[0082] The reason is that phenolic resin has excellent wear resistance and heat resistance. At the same time, it can also increase the adhesion between the coating and the mold, thereby extending the service life of the coating film and improving the demolding ability, so that the prepared coating will have better high temperature resistance and adhesion.

[0083] At the same time, since the bifunctional polysilsesquioxane contains both amino and mercapto groups, the amino group can react with the phenolic functional group in the phenolic resin, thereby connecting the bifunctional polysilsesquioxane to the phenolic resin matrix; and for the mercapto group, since the molding temperature of rubber is generally between 120-180°C, at this temperature, the mercapto group can react with the vinyl group in the vinyl polysiloxane under the action of an initiator to rapidly undergo a mercapto-double bond addition curing reaction, thereby forming a multi-cross-linked grid coating, thereby improving the wear resistance of the coating, and at the same time, due to the supplementation of polar groups, a strong complexation is formed between the coating and the mold, effectively improving the adsorption performance of the coating and the mold.

[0084] With reference to Example 1 and Comparative Example 4 and in combination with Table 5, it can be seen that, relative to Example 1, the thermal weight loss of Comparative Example 4 is significantly improved, the adhesion amount of Comparative Example 4 is slightly decreased, and the friction coefficient of Comparative Example 4 is slightly improved. This shows that replacing the bifunctional polysilsesquioxane-fluorine-containing phenolic resin with a mixture of the same added amount of mercapto polysilsesquioxane and fluorine-containing phenolic resin will also affect the heat resistance, adhesion ability and wear resistance of the high heat-resistant rubber release agent to a certain extent.

[0085] The reason is that the amino group can react with the phenolic functional group in the phenolic resin, thereby connecting the bifunctional polysilsesquioxane to the phenolic resin matrix, thereby forming a complete multiple network structure, thereby further improving the heat resistance, adhesion ability and wear resistance of the high heat-resistant rubber release agent.

[0086] With reference to Examples 1-3 and in combination with Table 5, it can be seen that, relative to Example 1, the thermal weight loss of Examples 2-3 is slightly improved, the adhesion amount of Examples 2-3 is slightly decreased, and the friction coefficient of Example 2 is slightly improved. This shows that when the components of the high heat-resistant rubber release agent are added in the amounts of Example 1, the prepared high heat-resistant rubber release agent will have better high temperature resistance, wear resistance and adhesion ability.

[0087] With reference to Example 1, Examples 4-5 and in combination with Table 5, it can be seen that, relative to Example 1, the thermal weight loss of Example 5 is slightly improved, the adhesion amounts of Examples 4-5 are significantly reduced, and the friction coefficients of Examples 4-5 are significantly improved. This shows that when the components of the bifunctional polysilsesquioxane-fluorine-containing phenolic resin are added in the amounts of Example 1, the prepared high heat-resistant rubber release agent will have better high temperature resistance, wear resistance and adhesion ability.

[0088] With reference to Example 1, Examples 6-7 and in combination with Table 5, it can be seen that, relative to Example 1, the thermal weight loss of Examples 6-7 is basically unchanged, but the adhesion amount of Examples 6-7 is significantly reduced, and the friction coefficient of Examples 6-7 is significantly improved. This shows that in the preparation of the bifunctional polysilsesquioxane-fluorine-containing phenolic resin, when 3-aminopropyltrimethoxysilane A1 and A2 are added in the amount of Example 1, the prepared high heat-resistant rubber release agent will have better wear resistance and adhesion ability.

[0089] The reason is that when 3-aminopropyltrimethoxysilane A1 and A2 are added in the amounts of Example 1, the phenol group in the fluorine-containing phenolic resin in A1 can react more quickly, simply and completely with the amino group in 3-aminopropyltrimethoxysilane, while in A2, 3-aminopropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane can undergo condensation reaction with the treated fluorine-containing phenolic resin, thereby promoting the rapid generation of bifunctional polysilsesquioxane containing amino groups and mercapto groups, thereby effectively improving the wear resistance and adhesion ability of the high heat-resistant rubber release agent.

[0090] With reference to Example 1, Examples 8-9 and in combination with Table 5, it can be seen that, relative to Example 1, the adhesion amount of Examples 8-9 is basically unchanged, but the thermal weight loss of Examples 8-9 is significantly improved, and the friction coefficients of Examples 8-9 are significantly improved. This shows that when the components of the fluorine-containing phenolic resin are added in the amounts of Example 1, the prepared high heat-resistant rubber release agent will have better wear resistance and adhesion ability.

[0091] The reason is that when the components of the fluorine-containing phenolic resin are added in the amounts of Example 1, the fluorine-containing phenolic resin can be generated effectively, quickly and stably.

[0092] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A highly heat-resistant rubber release agent, characterized in that: The invention comprises the following raw materials in parts by weight: 20-30 parts of bifunctional polysilsesquioxane-fluorine-containing phenolic resin, 2-4 parts of vinyl polysiloxane, 0.005-0.05 parts of initiator, 0.0001-0.001 parts of polymerization inhibitor, and 100-300 parts of organic solvent, wherein the bifunctional polysilsesquioxane contains amino group and mercapto group; The bifunctional polysilsesquioxane-fluorine-containing phenolic resin comprises the following raw materials in parts by weight: 5-7 parts of fluorine-containing phenolic resin, 10-14 parts of 3-aminopropyltrimethoxysilane and 6-8 parts of 3-mercaptopropyltrimethoxysilane; The preparation method of bifunctional polysilsesquioxane-fluorine-containing phenolic resin comprises the following steps: A1, adding 6 kg of fluorine-containing phenolic resin to 100 L of tetrahydrofuran and dispersing evenly, then adding 0.6 kg of dicyclohexylcarbodiimide, and then adding a portion of 3-aminopropyltrimethoxysilane, reacting at 25 ° C for 4 hours, then filtering and washing twice with tetrahydrofuran and then washing completely with anhydrous ethanol, and finally drying at a temperature of 60 ° C to obtain a pretreated bifunctional polysilsesquioxane-fluorine-containing phenolic resin; A2. Add the pretreated bifunctional polysilsesquioxane-fluorine-containing phenolic resin to 100 L of dimethyl sulfoxide and fully disperse it, then add the remaining 3-aminopropyltrimethoxysilane and 7 g of 3-mercaptopropyltrimethoxysilane, heat and stir at 60 ° C for 12 h, then cool to room temperature and add 0.3 kg of ammonium fluoride while stirring, continue stirring at room temperature for 24 h, and finally age at 80 ° C for 7 days, finally cool, filter, wash and dry to obtain a bifunctional polysilsesquioxane-fluorine-containing phenolic resin.

2. The highly heat-resistant rubber release agent according to claim 1, characterized in that: In A1, the amount of 3-aminopropyltrimethoxysilane added was 5 kg, and in A2, the amount of 3-aminopropyltrimethoxysilane added was 7 kg.

3. The highly heat-resistant rubber release agent according to claim 1, characterized in that: The fluorine-containing phenolic resin comprises the following raw materials in parts by weight: 0.5-1.5 parts of formaldehyde and 8-12 parts of 2,3,5,6-tetrafluorohydroquinone.

4. The highly heat-resistant rubber release agent according to claim 2, characterized in that: The preparation method of the fluorine-containing phenolic resin is as follows: 10 kg of 2,3,5,6-tetrafluorohydroquinone and 1 g of formaldehyde are heated and melted by hot water, and then 10 kg of tetrahydrofuran is added, and a 20 wt % zinc chloride solution is added while stirring, and heated under reflux for 6 hours, and the mixture is allowed to stand for stratification to remove water, and the solvent is removed by reduced pressure distillation at 80° C., and the reaction is stopped when the system viscosity reaches 70 cp / 80° C., so as to obtain the fluorine-containing phenolic resin.

5. The highly heat-resistant rubber release agent according to claim 1, characterized in that: The initiator is azobisisobutyronitrile, the inhibitor is hydroquinone, and the organic solvent is octane.

6. A method for preparing a highly heat-resistant rubber release agent according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: mixing bifunctional polysilsesquioxane-fluorine-containing phenolic resin, vinyl polysiloxane, an initiator, an inhibitor and an organic solvent, and then stirring the mixture evenly to obtain a high heat-resistant rubber release agent.

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