Release agent with self-healing performance and preparation method and application thereof

Abstract

The invention relates to the technical field of organic polymer composite material auxiliaries, and particularly discloses a release agent with self-healing performance and a preparation method and application thereof. The release agent is prepared from the following components in parts by weight: 1.0 to 10.0 parts of self-healing organic silicon resin, 0.1 to 2.5 parts of simethicone, 0.001 to 0.05 part of stabilizer and 86.0 to 99.0 parts of organic solvent, the self-healing organic silicon resin is prepared from hydroxyl-terminated polydimethylsiloxane dihydric alcohol, diisocyanate and amino silicone oil. Amino silicone oil molecules with an ABA triblock structure are utilized to react with organic silicone oil with an end isocyanate group, and a large number of acyl semicarbazide bonds are generated. A large number of multiple hydrogen bonds are formed between acyl semicarbazide bonds and urethane bonds, and the hydrogen bonds have reversibility, so that the release agent is endowed with good self-healing performance. The invention further provides a mold with the surface coated with the mold release agent, and the mold is low in abrasion in use and can be used for many times.

Description

Technical Field

[0001] The invention belongs to the technical field of organic polymer composite material additives, and particularly relates to a release agent with self-healing properties, a preparation method and application thereof. Background Art

[0002] Release agents are important polymer additives in the composite molding process. During composite molding, the release agent is first evenly applied to the mold surface. As the dispersing medium in the release agent evaporates, a complete, low-surface-tension coating layer forms on the mold surface. This coating layer prevents direct physical contact between the composite material and the mold surface, allowing the composite product to be easily released from the mold surface, completing the composite molding process. However, during the molding process, the low-surface-tension coating layer formed by the evaporation of the dispersing medium in the release agent inevitably scrapes against the composite product, causing damage to the coating layer. If the damage penetrates the entire coating layer and fails to heal spontaneously, the composite substrate will come into direct contact with the mold at the damaged location of the release agent coating, forming a strong bonding site between the two. This significantly increases the release force, making demolding difficult and even damaging the composite product. Furthermore, if the coating layer is mechanically damaged, it must be promptly reapplied with release agent for repair. Using traditional release agents has the disadvantages of increased labor and material costs, cumbersome processes, and low production efficiency.

[0003] Therefore, in order to solve the problems existing in the prior art, it is necessary to provide a semi-permanent release agent that has self-healing properties and can be used multiple times. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and provide a release agent with self-healing properties, a preparation method thereof, and an application thereof. The release agent utilizes the acyl semicarbazide bonds and urethane bonds formed by amino silicone oil (-NH2) and isocyanate (-NCO) silicone oil to form a large number of multiple hydrogen bonds, thereby giving the release agent good self-healing and multiple use properties.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The first aspect of the present invention is to provide a release agent with self-healing properties, the components of which include, by weight: 1.0 to 10.0 parts of a self-healing silicone resin, 0.1 to 2.5 parts of dimethyl silicone oil, 0.001 to 0.05 parts of a stabilizer, and 86.0 to 99.0 parts of an organic solvent;

[0007] The preparation method of the self-healing silicone resin comprises the following steps:

[0008] S1. Add hydroxy-terminated polydimethylsiloxane diol and diisocyanate in a molar ratio of 1:2 to 2.1, add 0.001% to 0.02% of the catalyst by weight, and react at 60° C. to 85° C. for 2.5 to 6 hours to obtain an intermediate product A;

[0009] S2. Add organic solvent and intermediate product A at room temperature and under stirring conditions, stir evenly, and then add the organic solvent and intermediate product A according to the molar number of functional groups n. -NCO :n -NH2 =1:1~3 and add amino silicone oil, stir, and react at room temperature for 0.5h~3h to obtain the product.

[0010] Furthermore, the structural formula of the hydroxy-terminated polydimethylsiloxane diol is Among them, 45≤a≤200.

[0011] Furthermore, the structural formula of the diisocyanate is

[0012] At least one of .

[0013] Furthermore, the structural formula of amino silicone oil is Among them, 1000≤m≤5×10 5 And m≥200(n+p), n and p are integers and p≥0.

[0014] Furthermore, the organic solvent is at least one of heptane, isoheptane, octane, isooctane, nonane, isononane, decane, isodecane, undecane, dodecane, tridecane, tetradecane, solvent oil D28, solvent oil D30, and petroleum ether (60-90).

[0015] Furthermore, the catalyst is at least one of dibutyltin dilaurate, stannous octoate, organic bismuth, pentamethyldiethylenetriamine, and dimethylcyclohexylamine.

[0016] Furthermore, the viscosity of the dimethyl silicone oil is 50 to 10,000 cps.

[0017] The second aspect of the present invention is to provide a method for preparing the above-mentioned release agent, wherein the preparation method comprises preparing the following components in parts by weight: 1.0 to 10.0 parts of a self-healing silicone resin, 0.1 to 2.5 parts of dimethyl silicone oil, 0.001 to 0.05 parts of a stabilizer, and 86.0 to 99.0 parts of an organic solvent;

[0018] The above components are mixed evenly at room temperature to obtain the semi-permanent release agent with self-healing properties.

[0019] The third aspect of the present invention is to provide the use of the above-mentioned release agent in preventing the material from adhering to the mold surface during the molding process.

[0020] A fourth aspect of the present invention is to provide a mold, the surface of which is coated with the above-mentioned release agent for use in demoulding molded products.

[0021] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0022] (1) The present invention provides a release agent with self-healing properties. The amino group of amino silicone oil reacts with an isocyanate-terminated (-NCO) silicone oil to generate a large number of acyl semicarbazide bonds. A large number of multiple hydrogen bonds can be formed between the acyl semicarbazide bonds and the urethane bonds. These numerous hydrogen bonds are reversible, giving the release agent good self-healing properties.

[0023] (2) The release agent provided by the present invention has a high self-healing rate, which is due to the chemical incompatibility between acylaminourea bonds and urethane bonds (both polar bonds) and dimethylsiloxane (non-polar bonds), resulting in microscopic phase separation. According to the mass percentage of the chemical components, the polar parts such as urethane bonds and acylaminourea bonds are relatively low in content (about 5-20%) and are dispersed phases; the non-polar parts such as dimethylsilane are high in content (about 80-95%) and are continuous phases. Thermodynamically, due to the occurrence of phase separation (the ABA triblock structure of amino silicone oil molecules at the microscopic level is more conducive to phase separation), the urethane bonds and urethane bonds are accelerated to enrich, which is conducive to the formation of reversible hydrogen bonds and improves the self-healing efficiency. Secondly, dimethylsilane / oil has a low melting point (glass transition temperature of about -126°C), good molecular chain flexibility, high movement performance, and fast phase separation. These factors all contribute to the rapid healing of the damaged release layer;

[0024] (3) The present invention adds a phosphate stabilizer to the release agent formula to prevent the active -NH2 from being oxidized to a nitrogen-oxygen (-N=O) bond during use, reducing the number of acyl semicarbazide bonds generated, which leads to the gradual loss of the self-healing properties of the release agent. Therefore, the addition of a phosphate stabilizer can enable the release agent to maintain its self-healing properties for a longer period of time, increasing the number of times the release agent can be used;

[0025] (4) The present invention also provides a mold with the above-mentioned release agent coated on its surface, which has less wear during use and can be used more times. The nitrogen, oxygen and other heteroatoms in the urethane bonds and acylaminourea bonds enriched in the separated phase contain excess electron pairs that undergo complexation and coordination with the empty orbitals of the metal atoms of the mold (iron, steel, aluminum, etc.), so that the release agent coating layer can be firmly bonded to the mold surface, reducing the wear loss caused by scratching between the composite material product and the release agent coating layer during construction. In addition, the excess or remaining amino groups (-NH2) in the amino silicone oil can react and further cross-link, thereby increasing the number of times the release agent can be used and reducing wear resistance losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the infrared spectrum of the isocyanate-terminated dimethylsiloxane obtained in Example 1;

[0027] Figure 2 Thermogravimetric curve of the self-healing semi-permanent release agent obtained in Example 1;

[0028] Figure 3 This is the infrared spectrum of the isocyanate-terminated dimethylsiloxane obtained in Example 2;

[0029] Figure 4 The thermogravimetric curve of the self-healing semi-permanent release agent obtained in Example 2. DETAILED DESCRIPTION

[0030] To make the objects, technical solutions, and advantages of the present invention more apparent, the following describes the specific embodiments of the present invention in further detail with reference to the specific examples and accompanying drawings. Where specific test methods, instruments, or conditions are not specified in the examples, the methods or conditions described in the literature in the art or the product specifications were used. Where the manufacturer of the reagents or instruments is not specified, all are commercially available conventional products.

[0031] The present invention provides a method for preparing a release agent with self-healing properties. The method comprises preparing the following components, in parts by weight: 1.0 to 10.0 parts of a self-healing silicone resin, 0.1 to 2.5 parts of dimethyl silicone oil, 0.001 to 0.05 parts of a stabilizer, and 86.0 to 99.0 parts of an organic solvent; and uniformly mixing the above components at room temperature to obtain the release agent.

[0032] The preparation method of the self-healing silicone resin comprises the following steps:

[0033] S1. Add hydroxy-terminated polydimethylsiloxane diol and diisocyanate in a molar ratio of 1:2 to 2.1, add 0.001% to 0.02% of the catalyst by weight, and react at 60° C. to 85° C. for 2.5 to 6 hours to obtain an intermediate product A;

[0034] S2. Add organic solvent and intermediate product A at room temperature and under stirring conditions, stir evenly, and then add the organic solvent and intermediate product A according to the molar number of functional groups n. -NCO :n -NH2 =1:1~3 and add amino silicone oil, stir, and react at room temperature for 0.5h~3h to obtain the product.

[0035] Among them, the structural formula of hydroxy-terminated polydimethylsiloxane diol is Where 45≤a≤200; the structural formula of diisocyanate is

[0036] At least one of; the structural formula of amino silicone oil is Among them, 1000≤m≤5×10 5 and m≥200(n+p), n and p are integers and p≥0; the organic solvent is at least one of heptane, isoheptane, octane, isooctane, nonane, isononane, decane, isodecane, undecane, dodecane, tridecane, tetradecane, solvent oil D28, solvent oil D30, and petroleum ether (60-90); the catalyst is at least one of dibutyltin dilaurate, stannous octoate, organic bismuth, pentamethyldiethylenetriamine, and dimethylcyclohexylamine; the stabilizer is at least one of triisopropylphenyl phosphate, tributylphenyl phosphate, and triphenyl phosphate; and the viscosity of the dimethyl silicone oil is 50 to 10,000 cps.

[0037] The release agent provided by the present invention can be prepared according to the above methods, which will be described below with reference to specific examples.

[0038] Example 1

[0039] This embodiment provides a method for preparing a release agent with self-healing properties, which is as follows:

[0040] S1. Add 0.0033 g (0.02%) of dibutyltin dilaurate to hydroxy-terminated polydimethylsiloxane diol (14.98 g, 1.0 mmol) and isophorone diisocyanate (0.47 g, 2.1 mmol) and react at 85°C for 6.0 h. Cool and filter to obtain dimethylsiloxane with isocyanate groups at both ends.

[0041] S2. Add 99.0g solvent oil D28 and 0.46g isocyanate-terminated dimethylsiloxane at room temperature and mechanical stirring. After stirring evenly, add 99.0g solvent oil D28 and 0.46g isocyanate-terminated dimethylsiloxane at room temperature and mechanical stirring. -NCO :n -NH2 =1:3 and add 9.54 g of amino silicone oil. Stir mechanically and react at room temperature for 3 h to obtain a self-healing silicone resin solution.

[0042] 2.5 g of dimethyl silicone oil and 0.05 g of triisopropylphenyl phosphate were added to 109.0 g of the obtained self-healing organic silicone resin solution, and the mixture was mixed uniformly under stirring to obtain a semi-permanent release agent with self-healing properties.

[0043] The chemical structure of the isocyanate-terminated dimethylsiloxane obtained in Example 1 was determined by infrared spectrometry. Figure 1 The product is at 2966cm -1 The absorption peak at 2269 cm is the absorption peak of dimethylsiloxane methyl, -1 The absorption peaks at 1089 and 1013 cm are the absorption peaks of -NCO. -1 The absorption peak at 3300-3400 cm -1 The absorption peak of no hydroxyl group is at 3061cm -1 The absorption peak of -NH in the urethane bond appeared at , indicating that isocyanate-terminated dimethylsiloxane has been successfully synthesized.

[0044] The self-healing semi-permanent release agent solution obtained in Example 1 was baked in a 60°C forced air drying oven to constant weight. 5.2 mg of the release agent baked to constant weight was added to a crucible and then placed in a thermogravimetric analyzer (TG) to measure its thermal properties. The test conditions were: heating from 30°C to 650°C at a heating rate of 20°C / min. The test results are shown in Figure 1. Figure 2 As shown in the figure, the 5% weight loss temperature (T d5 ) is 265.8℃; at 650℃, the weight fraction of SiO2 after constant weight is 11.3%.

[0045] Example 2

[0046] This embodiment provides a method for preparing a release agent with self-healing properties, which is as follows:

[0047] S1. Add 0.0016 g (0.01%) of stannous octoate to hydroxy-terminated polydimethylsiloxane diol (14.03 g, 4.0 mmol) and toluene diisocyanate (1.40 g, 8.0 mmol) and react at 75°C for 2.5 h. Cool and filter to obtain dimethylsiloxane with isocyanate groups at both ends.

[0048] S2. Add 36.0g solvent oil D30, 50.0g heptane and 0.39g isocyanate-terminated dimethylsiloxane at room temperature and mechanical stirring. After stirring evenly, add 0.39g isocyanate-terminated dimethylsiloxane according to the molar number of functional groups n. -NCO :n -NH2=1:1 and add 0.47 g of amino silicone oil. Stir mechanically and react at room temperature for 3.0 h to obtain a self-healing silicone resin solution.

[0049] 0.1 g of dimethyl silicone oil and 0.001 g of tributylphenyl phosphate were added to 87.0 g of the obtained self-healing silicone resin solution, and the mixture was mixed evenly under stirring to obtain a semi-permanent release agent with self-healing properties.

[0050] The chemical structure of the isocyanate-terminated dimethylsiloxane obtained in Example 2 was determined by infrared spectrometry. Figure 3 The product is at 2965cm -1 The absorption peak at 2269 cm is the absorption peak of dimethylsiloxane methyl, -1 The absorption peaks at 1093 and 1020 cm are the absorption peaks of -NCO. -1 The absorption peak at 3300-3400 cm -1 The absorption peak of no hydroxyl group is at 3071cm -1 The absorption peak of -NH in the urethane bond appeared at , indicating that isocyanate-terminated dimethylsiloxane has been successfully synthesized.

[0051] The self-healing semi-permanent release agent solution obtained in Example 2 was baked in a 60°C forced air drying oven to constant weight. 3.9 mg of the release agent baked to constant weight was added to a crucible and then placed in a thermogravimetric analyzer (TG) to measure its thermal properties. The test conditions were: heating from 30°C to 650°C at a heating rate of 20°C / min. The test results are shown in Figure 1. Figure 4 As shown in the figure, the 5% weight loss temperature (T d5 ) is 258.5℃; at 650℃, the weight fraction of SiO2 after constant weight is 4.65%.

[0052] Example 3

[0053] This embodiment provides a method for preparing a release agent with self-healing properties, which is as follows:

[0054] S1. Add 0.0003 g (0.001%) of pentamethyldiethylenetriamine to hydroxy-terminated polydimethylsiloxane diol (25.12 g, 2.5 mmol) and diphenylmethane diisocyanate (1.07 g, 5.15 mmol) and react at 60°C for 5.0 h. Cool and filter to obtain dimethylsiloxane with isocyanate groups at both ends.

[0055] S2. Add 50.0g solvent oil D28, 40.0g petroleum ether and 1.32g isocyanate-terminated dimethylsiloxane at room temperature and mechanical stirring. After stirring evenly, add 50.0g solvent oil D28, 40.0g petroleum ether and 1.32g isocyanate-terminated dimethylsiloxane at room temperature and mechanical stirring. -NCO :n -NH2 =1:2.5 and add 6.67 g of amino silicone oil. Stir mechanically and react at room temperature for 3 h to obtain a self-healing silicone resin solution.

[0056] 1.51 g of dimethyl silicone oil and 0.03 g of triphenyl phosphate were added to 97.99 g of the obtained self-healing silicone resin solution, and the mixture was mixed evenly under stirring to obtain a semi-permanent release agent with self-healing properties.

[0057] Example 4

[0058] This embodiment provides a method for preparing a release agent with self-healing properties, which is as follows:

[0059] S1. Add 0.0026 g (0.015%) of dimethylcyclohexylamine to hydroxy-terminated polydimethylsiloxane diol (15.09 g, 3.0 mmol), dicyclohexylmethane diisocyanate (0.80 g, 3.00 mmol), and 1,6-hexamethylene diisocyanate (0.52 g, 3.05 mmol). React at 70°C for 4 h. Cool and filter to obtain a dimethylsiloxane with isocyanate groups at both ends.

[0060] S2. Under room temperature and mechanical stirring, add 37.0g of undecane, 40.0g of isooctane, 13.0g of tetradecane, and 1.32g of isocyanate-terminated dimethylsiloxane. After stirring evenly, the mixture is stirred according to the molar number of functional groups n. -NCO :n -NH2 =1:1.5 and add 5.38 g of amino silicone oil. Stir mechanically and react at room temperature for 1.5 hours to obtain a self-healing silicone resin solution.

[0061] 1.5 g of dimethyl silicone oil, 0.005 g of triisopropylphenyl phosphate, and 0.003 g of triphenyl phosphate were added to 96.7 g of the obtained self-healing silicone resin solution, and the mixture was mixed evenly under stirring to obtain a semi-permanent release agent with self-healing properties.

[0062] Example 5

[0063] This embodiment provides a method for preparing a release agent with self-healing properties, which is as follows:

[0064] S1. Hydroxyl-terminated polydimethylsiloxane diol (8.01 g, 1.0 mmol), hydroxyl-terminated polydimethylsiloxane diol (7.03 g, 2.0 mmol), isophorone diisocyanate (0.47 g, 2.1 mmol), and dicyclohexylmethane diisocyanate (1.06 g, 4.00 mmol) were added with 0.0017 g (0.01%) of organic bismuth and reacted at 75°C for 3.5 h. The mixture was cooled and filtered to obtain a dimethylsiloxane with isocyanate groups at both ends.

[0065] S2. Add 70.0 g of isononane, 15.0 g of dodecane, 10.0 g of tridecane and 0.37 g of isocyanate-terminated dimethylsiloxane at room temperature and mechanical stirring. After stirring evenly, add 70.0 g of isononane, 15.0 g of dodecane, 10.0 g of tridecane and 0.37 g of isocyanate-terminated dimethylsiloxane at room temperature and mechanical stirring. -NCO :n -NH2 =1:1.5 and add 7.63 g of amino silicone oil. Stir mechanically and react at room temperature for 3 h to obtain a self-healing silicone resin solution.

[0066] 1.2 g of dimethyl silicone oil, 0.005 g of triisopropylphenyl phosphate, and 0.005 g of tributylphenyl phosphate were added to 119.6 g of the obtained self-healing silicone resin solution, and the mixture was mixed uniformly under stirring to obtain a semi-permanent release agent with self-healing properties.

[0067] Example 6

[0068] This embodiment provides a method for preparing a release agent with self-healing properties, which is as follows:

[0069] S1. Add 0.0011 g (0.003%) of dibutyltin dilaurate to hydroxyl-terminated polydimethylsiloxane diol (15.10 g, 1.0 mmol), hydroxyl-terminated polydimethylsiloxane diol (7.96 g, 1.0 mmol), hydroxyl-terminated polydimethylsiloxane diol (7.66 g, 2.2 mmol), toluene diisocyanate (0.70 g, 4.0 mmol), diphenylmethane diisocyanate (0.41 g, 1.60 mmol), and dicyclohexylmethane diisocyanate (0.80 g, 3.00 mmol), and react at 65°C for 5.0 h. Cool and filter to obtain a dimethylsiloxane with isocyanate groups at both ends.

[0070] S2. Add 30.0g decane, 56.0g dodecane and 1.03g dimethylsiloxane with terminal isocyanate group under mechanical stirring at room temperature. After stirring evenly, add 30.0g decane, 56.0g dodecane and 1.03g dimethylsiloxane with terminal isocyanate group under mechanical stirring at room temperature. -NCO :n -NH2 =1:1.7 and add 5.97 g of amino silicone oil. Stir mechanically and react at room temperature for 1.5 hours to obtain a self-healing silicone resin solution.

[0071] 1.5 g of dimethyl silicone oil and 0.03 g of triisopropylphenyl phosphate were added to 93.0 g of the obtained self-healing silicone resin solution, and the mixture was mixed uniformly under stirring to obtain a semi-permanent release agent with self-healing properties.

[0072] Performance testing and comparative experiments.

[0073] (1) Self-healing performance

[0074] Examples 1-6 and comparative sample DW977 were poured into a polytetrafluoroethylene mold and dried in a forced-air drying oven at 60°C to constant weight. The release agent coating was carefully cut through with a knife (without damaging the mold surface). The time required for the damaged area to completely heal was observed at room temperature and 60°C. The results are shown in Table 1.

[0075] Table 1. Self-healing time of damaged release agent at room temperature and 60°C

[0076] Test samples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 DW977 Room temperature healing time 6min 11min 9min 7min 9min 8min ＞2h 60℃ healing time 2min 4min 4min 2min 3min 3min ＞2h

[0077] As shown in Table 1, compared to the comparative sample DW977, the release agents of Examples 1-6 exhibit superior self-healing properties at both room temperature and 60°C. At room temperature, penetrating scratches can be completely healed in 6-11 minutes. At 60°C, the self-healing speed is significantly increased, with the damage healing within 2-4 minutes.

[0078] (2) Average demoulding times

[0079] For Examples 1-6 and Comparative Sample DW977, three mold sets were selected. Release agents were cured on steel molds according to standard construction techniques, and then epoxy carbon fiber composite materials were molded. After one release agent cure, the average number of demolding cycles for each Example and Comparative Sample is shown in Table 2.

[0080] Table 2. Average demolding times of release agents

[0081] Test samples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 DW977 Demolding times 5.33 6.33 5.67 7.33 6.67 5.67 3.33

[0082] It can be seen from the results in Table 2 that, compared with the comparative sample DW977, the average demoulding times of the release agents of Examples 1 to 6 are significantly greater than that of the comparative sample DW977.

[0083] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A release agent with self-healing properties, characterized in that: The components thereof include, by weight: 1.0 to 10.0 parts of self-healing organic silicone resin, 0.1 to 2.5 parts of dimethyl silicone oil, 0.001 to 0.05 parts of stabilizer, and 86.0 to 99.0 parts of organic solvent; The preparation method of the self-healing silicone resin comprises the following steps: S1. Add hydroxy-terminated polydimethylsiloxane diol and diisocyanate in a molar ratio of 1:2 to 2.1, add 0.001% to 0.02% of the catalyst by weight, and react at 60° C. to 85° C. for 2.5 to 6 hours to obtain an intermediate product A; S2. Add organic solvent and intermediate product A at room temperature and under stirring conditions, stir evenly, and then add the organic solvent and intermediate product A according to the molar number of functional groups n. -NCO :n -NH2 =1:1~3 and add amino silicone oil, stir, and react at room temperature for 0.5h~3h to obtain the product.

2. The release agent according to claim 1, wherein The structural formula of the hydroxy-terminated polydimethylsiloxane diol is Among them, 45≤a≤200.

3. The release agent according to claim 1, wherein The structural formula of the diisocyanate is At least one of .

4. The release agent according to claim 1, wherein The structural formula of amino silicone oil is Among them, 1000≤m≤5×10 5 And m≥200(n+p), n and p are integers and p≥0.

5. The release agent according to claim 1, wherein The organic solvent is at least one of heptane, isoheptane, octane, isooctane, nonane, isononane, decane, isodecane, undecane, dodecane, tridecane, tetradecane, solvent oil D28, solvent oil D30, and petroleum ether (60-90).

6. The release agent according to claim 1, wherein The catalyst is at least one of dibutyltin dilaurate, stannous octoate, organic bismuth, pentamethyldiethylenetriamine, and dimethylcyclohexylamine; and the stabilizer is at least one of triisopropylphenyl phosphate, tributylphenyl phosphate, and triphenyl phosphate.

7. The release agent according to claim 3, wherein The viscosity of the dimethyl silicone oil is 50 to 10,000 cps.

8. The method for preparing a release agent according to any one of claims 1 to 7, wherein: The preparation method comprises the following components, calculated by weight: 1.0 to 10.0 parts of self-healing silicone resin, 0.1 to 2.5 parts of dimethyl silicone oil, 0.001 to 0.05 parts of stabilizer, and 86.0 to 99.0 parts of organic solvent; The above components are mixed evenly at room temperature to obtain the semi-permanent release agent with self-healing properties.

9. Use of the release agent according to any one of claims 1 to 7 in preventing a material from adhering to a mold surface during molding.

10. A mold, characterized in that: The surface of the mold is coated with a release agent according to any one of claims 1 to 7 for demoulding the molded product.

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