A high temperature resistant silicone release agent and preparation method thereof

Abstract

The present invention relates to the technical field of silicone release agents, specifically to a high temperature resistant silicone release agent and a preparation method thereof. The high temperature resistant silicone release agent comprises the following weight components: 80-100 parts of vinyl silicone oil, 20-30 parts of modified silicone, 6-12 parts of hydrogenated silicone oil, 1-3 parts of anchoring agent, 2-10 parts of platinum catalyst, and 1-5 parts of inhibitor. The present invention is obtained by mixing vinyl silicone oil, modified silicone, hydrogenated silicone oil, inhibitor and anchoring agent, stirring for 15-30 minutes; then adding platinum catalyst, and continuing to stir for 3-5 minutes to obtain a high temperature resistant silicone release agent, which not only has excellent heat resistance, but also makes the silicone release layer not easy to deform under high temperature conditions, and also has good release performance.

Description

Technical Field

[0001] The invention relates to the technical field of organosilicon release agents, in particular to a high temperature resistant organosilicon release agent and a preparation method thereof. Background Art

[0002] In order to facilitate the separation of aluminum foil tape, a release layer is usually coated on the back to achieve the separation function from the pressure-sensitive adhesive. However, the existing release agents are mainly made of polyvinyl chloride or polycarbonate, which have poor high temperature resistance, so silicone release agents are gradually gaining attention.

[0003] Silicone release agents are generally made of a mixture of active silicone polymer main agent, cross-linking agent, cross-linking catalyst and other additives. Under high temperature conditions, the silicone release layer formed by the silicone release agent on the aluminum foil tape is prone to deformation, which can easily affect the adhesion of the aluminum foil tape and the release effect. At the same time, the silicon transfer phenomenon may cause the viscosity of the isolated viscous material to decrease less, thereby affecting the release performance. The industry usually uses the residual rate to indicate the severity of the silicon brick transfer phenomenon. A high residual rate indicates that the viscosity of the isolated viscous material decreases less, indicating that the release agent silicon brick transfer phenomenon is weaker and the release agent performance is better.

[0004] Therefore, we propose a high temperature resistant silicone release agent and a preparation method thereof. Summary of the invention

[0005] The purpose of the present invention is to provide a high temperature resistant silicone release agent and a preparation method thereof, so as to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for preparing a high temperature resistant silicone release agent comprises the following steps:

[0008] Step S1: vinyl silicone oil, modified silicone, hydrogen silicone oil, inhibitor and anchoring agent are mixed and stirred for 15-30 minutes;

[0009] Step S2: Add platinum catalyst and continue stirring for 3-5 minutes to obtain a high temperature resistant silicone release agent.

[0010] Furthermore, the high temperature resistant silicone release agent comprises the following components by weight: 80-100 parts of vinyl silicone oil, 20-30 parts of modified silicone, 6-12 parts of hydrogen-containing silicone oil, 1-3 parts of anchoring agent, 2-10 parts of platinum catalyst, and 1-5 parts of inhibitor.

[0011] Furthermore, the preparation method of the modified silicone is as follows:

[0012] Step (1): evenly mix methyl acrylate and methanol, dropwise add a mixed solution of 1,3-bis(3-aminopropyl)tetramethyldisiloxane and methanol, and complete the dropwise addition over 30-50 minutes, react at 60-70° C. for 44-48 hours, and obtain an intermediate by rotary evaporation;

[0013] Step (2): the intermediate and methanol are mixed evenly, and o-carborane diamine monomer and sodium ethoxide are added and mixed evenly, reacted at 60-70° C. for 44-48 hours, and subjected to rotary evaporation to obtain an amino-containing compound;

[0014] Step (3): Mix toluene and chloroform in an ice-water bath, add paraformaldehyde, amino compounds and magnolol, transfer to an oil bath under nitrogen protection, reflux at 85-95° C. for 8-10 h, cool to room temperature, and obtain modified silicone by rotary evaporation.

[0015] Furthermore, in the step (1), the mass ratio of methyl acrylate to methanol is 1:(4-6), and the mass ratio of 1,3-bis(3-aminopropyl)tetramethyldisiloxane to methanol is 1:(2.5-3.0).

[0016] Furthermore, in step (1), the mass of 1,3-bis(3-aminopropyl)tetramethyldisiloxane is 30-35% of the mass of methyl acrylate.

[0017] Furthermore, in the step (2), the mass ratio of the intermediate, methanol, o-carborane diamine monomer and sodium ethoxide is 1:(8-10):(3.5-4.0):(0.03-0.05).

[0018] Furthermore, in step (3), the volume ratio of toluene to chloroform is 2:1, and the ratio of the amino compound to toluene is 1:(20-25) g / mL.

[0019] Furthermore, in the step (3), the mass ratio of paraformaldehyde, the amino compound and magnolol is 1:(5-6):(2-3).

[0020] In the above technical scheme, the amino group of 1,3-bis(3-aminopropyl)tetramethyldisiloxane and the double bond of methyl acrylate undergo Michael addition reaction to obtain an intermediate; the intermediate then undergoes amidation reaction with an amino group in an ortho-carborane diamine monomer to obtain an amino-terminated organosilicon dendrimer, i.e., an amino-containing compound; finally, magnolol is used as a phenol source, polyformaldehyde is used as an aldehyde source, and an amino-containing compound is used as an ammonia source to prepare a modified organosilicon containing a benzoxazine structure through a Mannich reaction, and at the same time, a carborane structure is contained, thereby significantly improving the heat resistance of the material. Carborane is a cage-type structure compound with high symmetry composed of 10 boron atoms and 2 carbon atoms, and its molecule has certain conjugation and aromaticity. The structural characteristics of carborane make its molecule itself have very good thermal stability and chemical stability.

[0021] Furthermore, the preparation method of the o-carborane diamine monomer is as follows:

[0022] Step A: in an ice bath, diphenyl o-carborane, a mixed acid and dichloromethane are mixed evenly, stirred for reaction at room temperature for 3-5 hours, poured into ice water to quench the reaction, and after extraction, washing and drying, 1,2-di(nitrobenzene) o-carborane is obtained;

[0023] Step B: Under nitrogen protection, 1,2-di(nitrobenzene)-o-carborane, tin dichloride dihydrate, anhydrous ethanol, ethyl acetate and hydrochloric acid are mixed evenly, refluxed at 75-85° C. for 6-8 hours, cooled to room temperature, neutralized, extracted, washed and dried to obtain an o-carborane diamine monomer.

[0024] In the above technical scheme, carborane is a cage-type compound with high symmetry composed of 10 boron atoms and 2 carbon atoms. Its molecule has certain conjugation and aromaticity. The structural characteristics of carborane make the molecule itself have very good thermal stability and chemical stability. Diphenyl o-carborane is reacted with a mixed acid. The nitric acid in the mixed acid will introduce a nitro group into the benzene ring of o-carborane to generate 1,2-di(nitrobenzene) o-carborane. Subsequently, the nitro group (-NO2) is reduced to an amino group (-NH2) to finally obtain an o-carborane diamine monomer.

[0025] Furthermore, in step A, the ratio of diphenyl-o-carborane, mixed acid and dichloromethane is 1 g:20 mL:(15-20) mL, and the mixed acid is prepared by mixing nitric acid and sulfuric acid in a volume ratio of 1:3.

[0026] Furthermore, in step B, the mass ratio of 1,2-di(nitrobenzene)o-carborane, tin dichloride dihydrate, anhydrous ethanol, ethyl acetate and hydrochloric acid is 1:(6.0-6.2):(20-22):(20-22):(2.4-2.6).

[0027] Furthermore, in step B, the concentration of hydrochloric acid is 36-38wt%.

[0028] Furthermore, the vinyl silicone oil is vinyl-terminated polysiloxane with a viscosity of 100-10000 mPa·s and a vinyl content of 0.2-1.0%.

[0029] Furthermore, the viscosity of the hydrogen-containing silicone oil is 10-100 mPa·s, and the hydrogen content is 0.5-1.6%.

[0030] Furthermore, the anchoring agent is one of vinyltrimethoxysilane and γ-(methacryloyloxy)propyltrimethoxysilane.

[0031] Furthermore, the platinum catalyst is a Custer catalyst.

[0032] Furthermore, the inhibitor is one of methylbutynol, methylpentynol, and 2-phenyl-3-butyn-2-ol.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. A high temperature resistant silicone release agent and a preparation method thereof of the present invention comprises the following steps: the amino group in 1,3-bis(3-aminopropyl)tetramethyldisiloxane undergoes a Michael addition reaction with the double bond of methyl acrylate to obtain an intermediate; the intermediate undergoes an amidation reaction with an amino group in an ortho-carboranediamine monomer to obtain an amino-terminated silicone dendritic macromolecule, i.e., an amino-containing compound. The dendritic macromolecule has a large surface area and low surface energy, which is beneficial for reducing the adhesion between the silicone release layer and the adhesive surface of the aluminum foil tape, so that the adhesive surface of the aluminum foil tape is more easily separated from the silicone release layer when in use, thereby facilitating the use of the aluminum foil tape;

[0035] Finally, using magnolia officinalis as the phenol source, polyformaldehyde as the aldehyde source, and amino compounds as the ammonia source, a modified silicone containing a benzoxazine structure was prepared through the Mannich reaction. Not only was the carborane cage unit successfully introduced, significantly improving the heat resistance of the material and enabling it to maintain good performance in a high temperature environment, but double bonds were also introduced, allowing it to participate in the hydrosilylation reaction, providing more reaction sites for subsequent cross-linking reactions.

[0036] 2. A high temperature resistant silicone release agent and a preparation method thereof of the present invention comprises the following steps: uniformly mixing vinyl silicone oil, modified silicone, hydrogen-containing silicone oil, an inhibitor and an anchoring agent, and then adding a platinum catalyst to obtain a high temperature resistant silicone release agent, so that the silicone release layer is not easily deformed under high temperature conditions, thereby facilitating the aluminum foil tape to maintain good adhesion under high temperature conditions; wherein, the introduction of modified silicone enhances the lubricity and stability of the release agent, improves the fluidity during processing, and improves the high temperature resistance of the material, making it suitable for various high temperature application fields. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In this embodiment, the vinyl silicone oil: the viscosity is 1000mPa·s, the vinyl content is 0.45%, and it is sourced from Ningbo Runhe High-tech Materials Technology Co., Ltd.; the hydrogen-containing silicone oil: the viscosity is 50mPa·s, the hydrogen content is 1.0%, and it is sourced from Ningbo Runhe High-tech Materials Technology Co., Ltd.; the anchoring agent: vinyltrimethoxysilane, CAS No. 2768-02-7; the platinum catalyst: Custer catalyst, the platinum content is 5000ppm, and it is sourced from Heraeus Precious Metals Technology Co., Ltd.; the inhibitor: 2-phenyl-3-butyn-2-ol, CAS No. 127-66-2.

[0039] In the following examples and comparative examples, 1 part is equal to 1 g.

[0040] Embodiment 1: A method for preparing a high temperature resistant silicone release agent, comprising the following process:

[0041] Step S1: 80 parts of vinyl silicone oil, 20 parts of modified silicone, 6 parts of hydrogenated silicone oil, 1 part of inhibitor and 1 part of anchoring agent were mixed and stirred for 15 minutes;

[0042] Step S2: Add 2 parts of platinum catalyst and continue stirring for 3 minutes to obtain a high temperature resistant silicone release agent;

[0043] The preparation method of modified silicone is as follows:

[0044] Step (1): 20 parts of methyl acrylate and 80 parts of methanol are mixed evenly, and a mixed solution of 6 parts of 1,3-bis(3-aminopropyl)tetramethyldisiloxane and 15 parts of methanol is added dropwise for 30 minutes, and the mixture is reacted at 60° C. for 44 hours, and subjected to rotary evaporation to obtain an intermediate;

[0045] Step (2): 6 parts of the intermediate and 48 parts of methanol are mixed evenly, 21 parts of o-carborane diamine monomer and 0.18 parts of sodium ethoxide are added and mixed evenly, reacted at 60° C. for 44 hours, and subjected to rotary evaporation to obtain an amino-containing compound;

[0046] Step (3): 400 mL of toluene and 200 mL of chloroform are mixed evenly in an ice water bath, 4 parts of paraformaldehyde, 20 parts of an amino compound and 8 parts of magnolol are added, and the mixture is transferred to an oil bath under nitrogen protection, refluxed at 85° C. for 8 h, cooled to room temperature, and subjected to reduced pressure distillation, washing and drying to obtain modified organosilicon;

[0047] The preparation method of the ortho-carborane diamine monomer is as follows:

[0048] Step A: Under ice bath conditions, 21 parts of diphenyl o-carborane, 420 mL of mixed acid (mixed by nitric acid and sulfuric acid in a volume ratio of 1:3) and 315 mL of dichloromethane were mixed evenly, stirred at room temperature for 3 hours, poured into ice water to quench the reaction, and after extraction, washing and drying, 1,2-di(nitrobenzene) o-carborane was obtained;

[0049] Step B: Under nitrogen protection, 21 parts of 1,2-di(nitrobenzene)-o-carborane, 126 parts of tin dichloride dihydrate, 420 parts of anhydrous ethanol, 420 parts of ethyl acetate and 50.4 parts of 36wt% hydrochloric acid are mixed uniformly, refluxed at 75°C for 6h, cooled to room temperature, neutralized, extracted, washed and dried to obtain an o-carborane diamine monomer.

[0050] Embodiment 2: A method for preparing a high temperature resistant silicone release agent, comprising the following process:

[0051] Step S1: 90 parts of vinyl silicone oil, 25 parts of modified silicone, 8 parts of hydrogenated silicone oil, 3 parts of inhibitor and 2 parts of anchoring agent were mixed and stirred for 20 minutes;

[0052] Step S2: adding 6 parts of platinum catalyst and continuing stirring for 4 minutes to obtain a high temperature resistant silicone release agent;

[0053] The preparation method of modified silicone is as follows:

[0054] Step (1): 25 parts of methyl acrylate and 125 parts of methanol are mixed evenly, and a mixed solution of 8.5 parts of 1,3-bis(3-aminopropyl)tetramethyldisiloxane and 23 parts of methanol is added dropwise for 40 minutes, and the mixture is reacted at 65° C. for 46 hours, and subjected to rotary evaporation to obtain an intermediate;

[0055] Step (2): 6.5 parts of the intermediate and 58.5 parts of methanol are mixed evenly, 25 parts of o-carborane diamine monomer and 0.26 parts of sodium ethoxide are added and mixed evenly, reacted at 65° C. for 46 hours, and subjected to rotary evaporation to obtain an amino-containing compound;

[0056] Step (3): 550 mL of toluene and 275 mL of chloroform were mixed uniformly in an ice-water bath, 4.5 parts of paraformaldehyde, 25 parts of an amino compound and 11 parts of magnolol were added, and the mixture was transferred to an oil bath under nitrogen protection, and refluxed at 90° C. for 9 h, cooled to room temperature, and subjected to reduced pressure distillation, washing and drying to obtain modified organosilicon;

[0057] The preparation method of the ortho-carborane diamine monomer is as follows:

[0058] Step A: Under ice bath conditions, 25 parts of diphenyl o-carborane, 500 mL of mixed acid (mixed by nitric acid and sulfuric acid in a volume ratio of 1:3) and 450 mL of dichloromethane were mixed evenly, stirred at room temperature for 4 hours, poured into ice water to quench the reaction, and after extraction, washing and drying, 1,2-di(nitrobenzene) o-carborane was obtained;

[0059] Step B: Under nitrogen protection, 25 parts of 1,2-di(nitrobenzene)-o-carborane, 152.5 parts of tin dichloride dihydrate, 525 parts of anhydrous ethanol, 525 parts of ethyl acetate and 62.5 parts of 37wt% hydrochloric acid are mixed uniformly, refluxed at 80°C for 7h, cooled to room temperature, neutralized, extracted, washed and dried to obtain an o-carborane diamine monomer.

[0060] Embodiment 3: A method for preparing a high temperature resistant silicone release agent, comprising the following process:

[0061] Step S1: 100 parts of vinyl silicone oil, 30 parts of modified silicone, 12 parts of hydrogenated silicone oil, 5 parts of inhibitor and 3 parts of anchoring agent were mixed and stirred for 30 minutes;

[0062] Step S2: adding 10 parts of platinum catalyst and stirring for 5 minutes to obtain a high temperature resistant silicone release agent;

[0063] The preparation method of modified silicone is as follows:

[0064] Step (1): 30 parts of methyl acrylate and 180 parts of methanol were mixed evenly, and a mixed solution of 10.5 parts of 1,3-bis(3-aminopropyl)tetramethyldisiloxane and 31.5 parts of methanol was added dropwise for 50 minutes, and the mixture was reacted at 70° C. for 48 hours, and subjected to rotary evaporation to obtain an intermediate;

[0065] Step (2): 7.5 parts of the intermediate and 75 parts of methanol are mixed evenly, 30 parts of o-carborane diamine monomer and 0.375 parts of sodium ethoxide are added and mixed evenly, reacted at 70° C. for 48 hours, and subjected to rotary evaporation to obtain an amino-containing compound;

[0066] Step (3): 750 mL of toluene and 375 mL of chloroform were mixed evenly in an ice-water bath, 5 parts of paraformaldehyde, 30 parts of an amino compound and 15 parts of magnolol were added, and the mixture was transferred to an oil bath under nitrogen protection, and refluxed at 95° C. for 10 h, cooled to room temperature, and subjected to reduced pressure distillation, washing and drying to obtain modified organosilicon;

[0067] The preparation method of the ortho-carborane diamine monomer is as follows:

[0068] Step A: Under ice bath conditions, 30 parts of diphenyl o-carborane, 600 mL of mixed acid (nitric acid and sulfuric acid mixed in a volume ratio of 1:3) and 600 mL of dichloromethane were mixed evenly, stirred at room temperature for 5 hours, poured into ice water to quench the reaction, and after extraction, washing and drying, 1,2-di(nitrobenzene) o-carborane was obtained;

[0069] Step B: Under nitrogen protection, 30 parts of 1,2-di(nitrobenzene)-o-carborane, 186 parts of tin dichloride dihydrate, 660 parts of anhydrous ethanol, 660 parts of ethyl acetate and 78 parts of 38wt% hydrochloric acid are mixed uniformly, refluxed at 85°C for 8h, cooled to room temperature, neutralized, extracted, washed and dried to obtain an o-carborane diamine monomer.

[0070] Comparative Example 1: A method for preparing a high temperature resistant silicone release agent, comprising the following process:

[0071] Compared with Example 2, Comparative Example 1 adds 5 parts of modified silicone, and the other steps are the same as Example 2.

[0072] Comparative Example 2: A method for preparing a high temperature resistant silicone release agent, comprising the following process:

[0073] The preparation method of modified silicone is as follows:

[0074] 550 mL of toluene and 275 mL of chloroform were mixed evenly in an ice water bath, 4.5 parts of paraformaldehyde, 25 parts of 1,3-bis(3-aminopropyl)tetramethyldisiloxane and 11 parts of magnolol were added, and the mixture was transferred to an oil bath under nitrogen protection, refluxed at 90° C. for 9 h, cooled to room temperature, and subjected to reduced pressure distillation, washing and drying to obtain modified organosilicon;

[0075] Compared with Example 2, in Comparative Example 2, the amino compound is replaced with 1,3-bis(3-aminopropyl)tetramethyldisiloxane of the same mass, and the other steps are the same as those of Example 2.

[0076] Comparative Example 3: A method for preparing a high temperature resistant silicone release agent, comprising the following process:

[0077] The preparation method of modified silicone is as follows:

[0078] Step (1): 25 parts of methyl acrylate and 125 parts of methanol are mixed evenly, and a mixed solution of 8.5 parts of 1,3-bis(3-aminopropyl)tetramethyldisiloxane and 23 parts of methanol is added dropwise for 40 minutes, and the mixture is reacted at 65° C. for 46 hours, and subjected to rotary evaporation to obtain an intermediate;

[0079] Step (2): 6.5 parts of the intermediate and 58.5 parts of methanol are mixed evenly, 25 parts of o-carborane diamine monomer and 0.26 parts of sodium ethoxide are added and mixed evenly, reacted at 65° C. for 46 hours, and subjected to rotary evaporation to obtain an amino-containing compound;

[0080] Step (3): 550 mL of toluene and 275 mL of chloroform were mixed uniformly in an ice-water bath, 4.5 parts of paraformaldehyde, 18 parts of an amino compound and 11 parts of magnolol were added, and the mixture was transferred to an oil bath under nitrogen protection, and refluxed at 90° C. for 9 h, cooled to room temperature, and subjected to reduced pressure distillation, washing and drying to obtain modified organosilicon;

[0081] Compared with Example 2, in step (3) of Comparative Example 4, the mass ratio of paraformaldehyde to the amino-containing compound is 1:4, and the other steps are the same as those of Example 2.

[0082] Experiment: Take the high temperature resistant silicone release agent obtained in Examples 1-3 and Comparative Examples 1-3, and apply it on the polyester film with a coating machine, with a coating amount of 0.25g / m 2 , curing reaction at 150℃ for 30s to obtain release film, and its performance was tested and the test results were recorded:

[0083] The release force test was carried out according to the FTM10 standard established by the World Self-adhesive Label Association (FINAT). The experimental steps were as follows: affix Tesa7475 standard tape to the release film and cut into standard specimens of 25mm×130mm. The release force was tested at room temperature using a standard stainless steel bar for 20 hours, which was the normal temperature release force; the release force was tested at 70℃ using a standard stainless steel bar for 20 hours and then cooled, which was the aging release force; the release force was tested at 180℃ using a standard stainless steel bar for 10 hours and then cooled, which was the high temperature release force. When testing the specimens, the stretching speed was 300mm / min and the stretching angle was 180°.

[0084] Residual rate test: First, stick the Nitto 31B tape on the release film to be tested according to the standard method, press it in a 70℃ oven with a standard stainless steel bar (2kg) for 20h, take it out and place it at room temperature for 1h, then tear the tape off the release paper and stick it on the steel plate, and test it with a release force tester after 1.5h. The tensile force at a tensile speed of 300mm / min and a tensile angle of 180° is recorded as the force of peeling the test tape (L1). At the same time, directly stick the Nitto 31B tape on the steel plate, and test it with a release force tester after 1.5h. The tensile force at a tensile speed of 300mm / min and a tensile angle of 180° is recorded as the tensile force of the blank standard sample (L2), and the residual rate is calculated as: L1 / L2×100%.

[0085] The test results are as follows:

[0086]

[0087] According to the data in the above table, we can clearly draw the following conclusions:

[0088] 1. Compared with Examples 1-3, the release force of the product obtained in Comparative Example 1 is increased and the residual rate is decreased. This is because the modified silicone prepared by the present invention contains vinyl, which increases the vinyl content in the system, improves the crosslinking density, and reduces the mobility of the molecular chain, thereby resulting in a decrease in the release force and an increase in the residual rate; at the same time, the modified silicone has excellent heat resistance, which increases the resistance to chain migration and leads to an increase in the residual rate. Therefore, reducing the amount of modified silicone added will reduce the release effect.

[0089] 2. Compared with Examples 1-3, the release force of the product obtained in Comparative Example 2 is increased and the residual rate is decreased. It can be seen that compared with 1,3-bis(3-aminopropyl)tetramethyldisiloxane, the amino-containing compound prepared by the present invention has an organosilicon dendritic macromolecular structure and contains a carborane structure, which can improve the release effect and heat resistance of the material.

[0090] 3. Compared with Examples 1-3, the release performance of the product obtained in Comparative Example 3 is reduced. It can be seen that when the amount of amino compound added is reduced, the heat resistance of the release agent will decrease. It can be seen that the performance of the modified silicone prepared by the present invention is affected by the ratio of each reagent in its preparation process. By selecting a mass ratio within the range, the prepared modified silicone has excellent heat resistance, thereby improving the release effect.

[0091] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A method for preparing a high temperature resistant silicone release agent, characterized in that: The steps include: Step S1: vinyl silicone oil, modified silicone, hydrogen silicone oil, inhibitor and anchoring agent are mixed and stirred for 15-30 minutes; Step S2: Add platinum catalyst and continue stirring for 3-5 minutes to obtain a high temperature resistant silicone release agent; The high temperature resistant silicone release agent comprises the following components by weight: 80-100 parts of vinyl silicone oil, 20-30 parts of modified silicone, 6-12 parts of hydrogen-containing silicone oil, 1-3 parts of anchoring agent, 2-10 parts of platinum catalyst, and 1-5 parts of inhibitor; The preparation method of the modified silicone is as follows: Step (1): evenly mix methyl acrylate and methanol, dropwise add a mixed solution of 1,3-bis(3-aminopropyl)tetramethyldisiloxane and methanol, and complete the dropwise addition over 30-50 minutes. The mixture is reacted at 60-70° C. for 44-48 hours, and subjected to rotary evaporation to obtain an intermediate. Step (2): uniformly mix the intermediate and methanol, add o-carborane diamine monomer and sodium ethoxide, mix uniformly, react at 60-70° C. for 44-48 hours, and obtain an amino compound by rotary evaporation; Step (3): Mix toluene and chloroform in an ice-water bath, add paraformaldehyde, an amino compound and magnolol, transfer to an oil bath under nitrogen protection, reflux at 85-95° C. for 8-10 hours, cool to room temperature, and obtain modified organosilicon by rotary evaporation; In the step (3), the mass ratio of paraformaldehyde, the amino compound and magnolol is 1:(5-6):(2-3).

2. The method for preparing a high temperature resistant silicone release agent according to claim 1, characterized in that: In the step (1), the mass of 1,3-bis(3-aminopropyl)tetramethyldisiloxane is 30-35% of the mass of methyl acrylate.

3. The method for preparing a high temperature resistant silicone release agent according to claim 1, characterized in that: In the step (2), the mass ratio of the intermediate, methanol, o-carborane diamine monomer and sodium ethoxide is 1:(8-10):(3.5-4.0):(0.03-0.05).

4. The method for preparing a high temperature resistant silicone release agent according to claim 3, characterized in that: The preparation method of the ortho-carborane diamine monomer is as follows: Step A: in an ice bath, diphenyl o-carborane, a mixed acid and dichloromethane are mixed evenly, stirred for reaction at room temperature for 3-5 hours, poured into ice water to quench the reaction, and after extraction, washing and drying, 1,2-di(nitrobenzene) o-carborane is obtained; Step B: Under nitrogen protection, 1,2-di(nitrobenzene)-o-carborane, tin dichloride dihydrate, anhydrous ethanol, ethyl acetate and hydrochloric acid are mixed evenly, refluxed at 75-85° C. for 6-8 hours, cooled to room temperature, neutralized, extracted, washed and dried to obtain an o-carborane diamine monomer.

5. The method for preparing a high temperature resistant silicone release agent according to claim 1, characterized in that: The anchoring agent is one of vinyl trimethoxy silane and γ-(methacryloyloxy)propyl trimethoxy silane.

6. The method for preparing a high temperature resistant silicone release agent according to claim 1, characterized in that: The platinum catalyst is a Custer catalyst.

7. The method for preparing a high temperature resistant silicone release agent according to claim 1, characterized in that: The inhibitor is one of methylbutynol, methylpentynol and 2-phenyl-3-butyn-2-ol.

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