A silica gel protective film and a preparation method thereof

Abstract

The application discloses a silica gel protective film and a preparation method thereof, and relates to the field of new materials. The silica gel protective film comprises a base material layer, a silica gel layer and a release layer, the silica gel layer is prepared from a silicone adhesive, and the silicone adhesive comprises an A component, a B component and a Si-H crosslinking agent. Raw materials of the A component are methylphenylvinyl silicone rubber and fumed silica, and the viscosity is adjusted to 28000-32000 cp by using a dispersing agent; raw materials of the B component are methylvinyl MQ silicone resin, and the viscosity is adjusted to 12000-18000 cp by using a dispersing agent; and the Si-H crosslinking agent is long-chain alkyl polyether modified hydrogen-containing silicone oil. The silica gel protective film with the specific A component, the B component and the Si-H crosslinking agent has initial adhesion, high cohesive strength, is not prone to residual glue, and the Si-H crosslinking agent has greatly improved precipitation performance, so that the service life of the silica gel protective film is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new materials, in particular to a silica gel protective film and a preparation method thereof. BACKGROUND

[0002] As a common surface protective material, silica gel protective film is widely used in electronic products and optical devices to prevent scratching, dust and pollution. The silica gel protective film generally comprises a substrate layer, a silica gel layer and a release layer. The silica gel layer is usually formed by curing an organic silicon adhesive, and its performance directly affects the adhesion, peeling performance and residual glue of the protective film.

[0003] Most of the commonly used organic silicon adhesives are based on vinyl polysiloxane as the base polymer, and are matched with Si-H bond-containing crosslinking agents to form a three-dimensional crosslinked structure through a platinum-catalyzed hydrosilylation reaction. However, the traditional formula still has certain limitations in practical application: the hydrogen-containing silicone oil crosslinking agent commonly used in the silica gel layer is prone to migration and precipitation, which not only affects the adhesion between the silica gel protective film and the protected surface, but also may contaminate the protected surface. SUMMARY

[0004] In order to improve the problem that the silicon hydrogen substance in the silica gel protective film is easy to precipitate in the related art, the present application provides a silica gel protective film and a preparation method thereof.

[0005] In a first aspect, the silica gel protective film provided by the present application adopts the following technical solution:

[0006] A silica gel protective film comprises a substrate layer, a silica gel layer and a release layer, and the silica gel layer is obtained by baking and curing an organic silicon adhesive, wherein the organic silicon adhesive comprises component A, component B, a Si-H crosslinking agent, an inhibitor, a catalyst and a diluent.

[0007] The raw material of the component A is methylphenyl vinyl silicone rubber and fumed silica, and the viscosity is adjusted to 28000-32000 cp by a dispersing agent; the raw material of the component B is methyl vinyl MQ silicone resin, and the viscosity is adjusted to 12000-18000 cp by a dispersing agent.

[0008] Among the organic silicon adhesive, the ratio of the molar amount of vinyl in the methylphenyl vinyl silicone rubber, the molar amount of vinyl in the methyl vinyl MQ silicone resin and the molar amount of Si-H bond in the Si-H crosslinking agent is (0.65-0.75):(0.15-0.2):1.

[0009] The Si-H crosslinking agent is a long-chain alkyl polyether modified hydrogen-containing silicone oil.

[0010] In the present application, the effective components of the A component are methylphenyl vinyl silicone rubber and fumed silica, wherein the methylphenyl vinyl silicone rubber serves as an elastomer matrix, endowing the silica gel layer with adhesion and flexibility, and the fumed silica has a large specific surface area and can strongly adsorb or entangle the methylphenyl vinyl silicone rubber, which is conducive to enhancing the cohesive strength of the silica gel layer and ensuring the integrity of the silica gel layer when the silica gel protective film is peeled off, and the silica gel protective film is not easy to leave residual glue on the protected surface.

[0011] The effective components of the B component are methyl vinyl MQ silicone resins, which can increase the adhesion, provide better initial adhesion of the silica gel layer, facilitate the stable adhesion of the silica gel layer to the protected surface, and also increase the cohesive strength of the silica gel layer, so that the silica gel protective film is not easy to leave residual glue on the protected surface when peeled off. However, the methyl vinyl MQ silicone resins are brittle, and the amount thereof should not be too much, and should be controlled within a suitable amount range. In the present application, the amount of the methyl vinyl MQ silicone resins is reasonably controlled, so that the adhesion between the silica gel protective film and the protected surface can be controlled to be between 35-45 g / in, which can prevent the silica gel protective film from warping or brittle cracking, and also reduce the pollution of the silica gel protective film to the protected surface.

[0012] Secondly, the A component and the B component are adjusted to a specific viscosity range by a dispersing agent in the present application, the dispersion of the Si-H crosslinking agent in the system is improved by the cooperation of the A component and the B component with different viscosities, the reaction efficiency of the Si-H crosslinking agent is improved, and the migration of the Si-H crosslinking agent is reduced. At the same time, the Si-H crosslinking agent specifically adopts long-chain alkyl polyether modified hydrogen-containing silicone oil, which further reduces the migration of the Si-H crosslinking agent by using the hydrophobic effect of long-chain alkyl and the entanglement effect of polyether segments, and is conducive to reducing the pollution of the protected surface.

[0013] That is, the present application can obtain a silica gel layer with initial adhesion, high cohesive strength, and reduced residual glue, and greatly improved Si-H crosslinking agent precipitation performance by the cooperation of the specific A component, B component, and Si-H crosslinking agent, which can prolong the service life of the silica gel protective film.

[0014] In some specific embodiments, the long-chain alkyl polyether modified hydrogen-containing silicone oil is obtained by a silicon-hydrogen addition reaction of a monoalkenyl polyether, a long-chain monoalkene, and a hydrogen-containing silicone oil, wherein the molar ratio of C=C in the monoalkenyl polyether, C=C in the long-chain monoalkene, and Si-H bond in the hydrogen-containing silicone oil is (0.1-0.2):(0.1-0.15):1.

[0015] In the present application, the long-chain alkyl polyether modified hydrogen-containing silicone oil is obtained by the hydrosilylation reaction of a mono-alkenyl polyether, a long-chain mono-alkene and a hydrogen-containing silicone oil in a specific ratio, wherein the polyether segment and the long-chain alkyl segment are introduced by the mono-alkenyl polyether and the long-chain mono-alkene, respectively, which is conducive to improving the stability of the Si-H crosslinking agent and reducing the precipitation problem of the Si-H crosslinking agent.

[0016] In some specific embodiments, the long-chain mono-alkene adopts a C12-C18 mono-alkene.

[0017] In some specific embodiments, the hydrogen-containing silicone oil has a structural formula of Me3SiO(Me2SiO) m (MeHSiO) n SiMe3, wherein the value of m is 60-85 and the value of n is 8-10.

[0018] In the present application, the hydrogen-containing silicone oil with the preferred molecular weight and hydrogen content range is selected, which is conducive to taking into account the dispersion and stability of the Si-H crosslinking agent.

[0019] In some specific embodiments, the mono-alkenyl polyether adopts an allyl epoxy polyether, and the fumed silica adopts a modified fumed silica obtained by grafting modification of the fumed silica with a vinyl silane coupling agent and an amino silane coupling agent, wherein the weight ratio of the vinyl silane coupling agent, the amino silane coupling agent and the fumed silica is (1-1.5):(2.5-3.0):100.

[0020] In the Si-H crosslinking agent of the present application, the mono-alkenyl polyether adopts an allyl epoxy polyether with an epoxy group, and the fumed silica adopts a modified fumed silica obtained by common modification of a vinyl silane coupling agent and an amino silane coupling agent, wherein the epoxy group in the allyl epoxy polyether reacts with the amino group in the modified fumed silica, and the allyl group in the modified fumed silica reacts with the Si-H bond in the Si-H crosslinking agent, which is conducive to further improving the cohesive strength of the silica gel layer, improving the stability of the Si-H crosslinking agent, and further improving the problem of easy precipitation of the Si-H crosslinking agent.

[0021] In some specific embodiments, the allyl epoxy polyether adopts an allyl epoxy polyoxypropylene ether. In the allyl epoxy polyoxypropylene ether, the polymerization degree of the polyoxypropylene segment is 20-25.

[0022] In some specific embodiments, the catalyst adopts a platinum gold catalyst, and the mass of the platinum gold catalyst accounts for 0.01-0.02% of the mass of the Si-H crosslinking agent.

[0023] In some specific embodiments, the inhibitor is an alkyne alcohol inhibitor, and the mass of the alkyne alcohol inhibitor accounts for 1.5-2.5% of the mass of the Si-H crosslinking agent.

[0024] In some specific embodiments, the mass of the diluent accounts for 10-20% of the mass of the Si-H crosslinking agent.

[0025] In a second aspect, the application provides a preparation method of a silicone protective film, which adopts the following technical scheme:

[0026] A preparation method of a silicone protective film, comprising the following steps:

[0027] Uniformly coating an organic silicone adhesive on one surface of the substrate layer, and then baking and curing to obtain a silicone layer;

[0028] Uniformly coating a release agent on the side of the silicone layer away from the substrate layer to form a release layer, thereby obtaining the silicone protective film.

[0029] In some specific embodiments, the baking and curing is controlled at a temperature of 140-150℃ for 30-40s.

[0030] In summary, the application at least has the following beneficial technical effects:

[0031] (1) The application can obtain a silicone layer with initial adhesion, high cohesive strength, no residual glue and greatly improved Si-H crosslinking agent precipitation performance by the cooperation of the specific A component, B component and Si-H crosslinking agent, thereby prolonging the service life of the silicone protective film.

[0032] (2) In the Si-H crosslinking agent of the application, the mono-alkenyl polyether is an allyl epoxy polyether with an epoxy group, the fumed silica is modified fumed silica obtained by the common modification of a vinyl silane coupling agent and an amino silane coupling agent, wherein the epoxy group in the allyl epoxy polyether reacts with the amino group in the modified fumed silica, and the allyl group in the modified fumed silica reacts with the Si-H bond in the Si-H crosslinking agent, which is conducive to further improving the cohesive strength of the silicone layer, further improving the stability of the Si-H crosslinking agent, and further improving the problem of easy precipitation of the Si-H crosslinking agent. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic diagram of a silicone protective film according to the embodiment.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1, substrate layer; 2, silicone layer; 3, release layer. DETAILED DESCRIPTION

[0036] The application will be further described in detail by specific examples, which do not represent the limitation of the scope of protection of the application. Some non-essential modifications and adjustments made by others according to the concept of the application still belong to the scope of protection of the application. The raw materials, reagents or devices used in the examples can be obtained from conventional commercial channels or can be obtained by existing technical methods. Unless otherwise specified, the test or test method is the conventional method in the art.

[0037] Preparation example of Si-H crosslinking agent

[0038] Preparation example 1-1

[0039] A Si-H crosslinking agent obtained by hydrosilylation reaction of allyl epoxy polyoxypropylene ether, 1-dodecene and hydrogen-containing silicone oil, wherein the polymerization degree of the polyoxypropylene segment in the allyl epoxy polyoxypropylene ether is 25, and the structural formula of the hydrogen-containing silicone oil is Me3SiO(Me2SiO) 60 (MeHSiO) 10 SiMe3;

[0040] The molar ratio of C=C bond in allyl epoxy polyoxypropylene ether, C=C bond in 1-dodecene and Si-H bond in hydrogen-containing silicone oil is 0.1:0.15:1.

[0041] In this preparation example, the preparation method of the Si-H crosslinking agent is as follows:

[0042] The allyl epoxy polyoxypropylene ether, 1-dodecene and hydrogen-containing silicone oil are put into toluene, the mass of toluene accounts for 40% of the total mass of the material, stirred under nitrogen protection, and heated to 95-100℃ to reflux and dehydrate for 1.5h, then stop heating, when the temperature drops to 60-65℃, drop the chloroplatinic acid catalyst solution, the mass of chloroplatinic acid catalyst accounts for 0.15% of the total mass of the material, control the temperature at 75-80℃ for 4h, after removing toluene, the Si-H crosslinking agent is obtained.

[0043] Preparation example 1-2

[0044] A Si-H crosslinking agent obtained by hydrosilylation reaction of allyl epoxy polyoxypropylene ether, 1-octadecene and hydrogen-containing silicone oil, wherein the polymerization degree of the polyoxypropylene segment in the allyl epoxy polyoxypropylene ether is 20, and the structural formula of the hydrogen-containing silicone oil is Me3SiO(Me2SiO) 85 (MeHSiO)8SiMe3;

[0045] The molar ratio of C=C bond in allyl epoxy polyoxypropylene ether, C=C bond in 1-octadecene and Si-H bond in hydrogen-containing silicone oil is 0.2:0.1:1.

[0046] Preparation example 1-3

[0047] A Si-H crosslinking agent, which is different from

Preparation Example 1-1

[0048]

Preparation Example 1-4

[0049] A Si-H crosslinking agent, which is different from

Preparation Example 1-1

[0050]

Preparation Example 1-5

[0051] A Si-H crosslinking agent, which is different from

Preparation Example 1-1

[0052] Preparation Example of modified fumed silica

[0053]

Preparation Example 2-1

[0054] A modified fumed silica, which is specifically obtained by grafting modification of 10 kg of fumed silica (Hui Fu HL-150) with 0.1 kg of vinyl trimethoxysilane and 0.3 kg of amino silane coupling agent KH550.

[0055] In this preparation example, the preparation method of the modified fumed silica is as follows:

[0056] The vinyl trimethoxysilane and the amino silane coupling agent KH550 are dissolved in 100 kg of an ethanol solution with a mass concentration of 95% to obtain a silane modification liquid;

[0057] The fumed silica is added to the silane modification liquid, heated to 55-60°C and reacted for 2 h, then filtered, and the filter residue is washed and dried to obtain the modified fumed silica.

[0058] Preparation Example of Organic Binder

[0059]

Preparation Example 3-1

[0060] An organic silicone adhesive, which is obtained by uniformly mixing a component A, a component B, a Si-H crosslinking agent, an inhibitor, a catalyst, and a diluent.

[0061] A component includes methyl phenyl vinyl silicone rubber (IOTA R33) and fumed silica (Hui Fu HL-150), the weight ratio of methyl phenyl vinyl silicone rubber and fumed silica is 45:4.3, then adjust the viscosity to 28000-29000 cp with xylene; B component is methyl vinyl MQ silicone resin (Daiyi DY-VMQ101(0.9)), adjust the viscosity to 17000-18000 cp with xylene; Si-H crosslinking agent adopts the Si-H crosslinking agent prepared in

Preparation Example 1-1

[0062] In addition, in the silicone adhesive of the present preparation example, the ratio of the molar amount of vinyl in the methyl phenyl vinyl silicone rubber, the molar amount of vinyl in the methyl vinyl MQ silicone resin and the molar amount of Si-H bond in the Si-H crosslinking agent is 0.65:0.2:1; the mass of the inhibitor accounts for 1.5% of the mass of the Si-H crosslinking agent, the mass of the catalyst accounts for 0.01% of the mass of the Si-H crosslinking agent, and the mass of the diluent accounts for 10% of the mass of the Si-H crosslinking agent.

[0063]

Preparation Example 3-2

[0064] A silicone adhesive is obtained by uniformly mixing A component, B component, Si-H crosslinking agent, inhibitor, catalyst and diluent.

[0065] A component includes methyl phenyl vinyl silicone rubber (IOTA R33) and fumed silica (Hui Fu HL-150), the weight ratio of methyl phenyl vinyl silicone rubber and fumed silica is 45:4.3, then adjust the viscosity to 28000-29000 cp with xylene; B component is methyl vinyl MQ silicone resin (Daiyi DY-VMQ101(0.9)), adjust the viscosity to 17000-18000 cp with xylene; Si-H crosslinking agent adopts the Si-H crosslinking agent prepared in

Preparation Example 1-1

[0066] In addition, in the silicone adhesive of the present preparation example, the ratio of the molar amount of vinyl in the methyl phenyl vinyl silicone rubber, the molar amount of vinyl in the methyl vinyl MQ silicone resin and the molar amount of Si-H bond in the Si-H crosslinking agent is 0.65:0.2:1; the mass of the inhibitor accounts for 1.5% of the mass of the Si-H crosslinking agent, the mass of the catalyst accounts for 0.01% of the mass of the Si-H crosslinking agent, and the mass of the diluent accounts for 10% of the mass of the Si-H crosslinking agent.

[0067]

Preparation Example 3-3

[0068] An organic silicone adhesive, which is different from

Preparation Example 3-1

Preparation Example 1-2

[0069]

Preparation Example 3-4

[0070] An organic silicone adhesive, which is different from

Preparation Example 3-1

Preparation Example 1-3

[0071]

Preparation Example 3-5

[0072] An organic silicone adhesive, which is different from

Preparation Example 3-1

Preparation Example 2-1

[0073]

Preparation Example 3-6

[0074] An organic silicone adhesive, which is different from

Preparation Example 3-4

Preparation Example 2-1

[0075]

Preparation Example 3-7

[0076] An organic silicone adhesive, which is different from

Preparation Example 3-1

[0077]

Preparation Example 3-8

[0078] An organic silicone adhesive, which is different from

Preparation Example 3-1

[0079] In the organic silicone adhesive of the present preparation example, the molar amount of Si-H bonds in the hydrogen-containing silicone oil is equal to the molar amount of Si-H bonds in the Si-H crosslinking agent prepared in

Preparation Example 1-1

[0080]

Preparation Example 3-9

[0081] An organic silicone adhesive, which is different from

Preparation Example 3-1

Preparation Example 1-4

[0082]

Preparation Example 3-10

[0083] An organic silicone adhesive, which is different from

Preparation Example 3-1

Preparation Example 1-5

[0084]

Example 1

[0085] A silicone protective film, referring to Figure 1 , comprising a substrate layer, a silicone layer and a release layer arranged in order from top to bottom, wherein the substrate layer adopts a PET substrate layer, the silicone layer is prepared from the organic silicone adhesive prepared in

Preparation Example 3-1

[0086] In the present example, the preparation method of the silicone protective film is as follows:

[0087] Uniformly coating the organic silicone adhesive on one surface of the substrate layer, and then baking at 150℃ for 30s to obtain the silicone layer;

[0088] Uniformly coating the silicone release agent (TEGO RC902) on the side of the silicone layer away from the substrate layer to form the release layer, and obtain the silicone protective film.

[0089]

Example 2

[0090] A silicone protective film, which is different from

Example 1

Preparation Example 3-2

[0091]

Example 3

[0092] A silicone protective film, which differs from

Example 1

Preparation Example 3-3

[0093]

Example 4

[0094] A silicone protective film, which differs from

Example 1

Preparation Example 3-4

[0095]

Example 5

[0096] A silicone protective film, which differs from

Example 1

Preparation Example 3-5

[0097]

Example 6

[0098] A silicone protective film, which differs from

Example 1

Preparation Example 3-6

[0099] Comparative Example

[0100]

Comparative Example 1

[0101] A silicone protective film, which differs from

Example 1

Preparation Example 3-7

[0102]

Comparative Example 2

[0103] A silicone protective film, which differs from

Example 1

Preparation Example 3-8

[0104]

Comparative Example 3

[0105] A silicone protective film, which differs from

Example 1

Preparation Example 3-9

[0106]

Comparative Example 4

[0107] A silicone protective film, which differs from

Example 1

Preparation Example 3-10

[0108] Performance test test

[0109] Room temperature peeling performance: After the release layer of the silicone protective film was torn, it was pasted on a stainless steel plate with a smooth surface, air bubbles were removed by rolling with a press roller, and then it was left to stand at 20°C for 20 minutes; then peeling was performed at an angle of 180° and a constant speed of 300 mm / min on a universal material tensile testing machine, and the stainless steel plate was observed or touched back and forth to determine whether there was adhesive residue.

[0110] Silicon transfer rate: after tearing off the release layer of the silicone protective film, paste it on the PET substrate, then load 20g / cm2 under 80℃ environment 2 After standing for 12h, tear off the silicone protective film, at this time the area on the PET substrate pasted by the silicone protective film is the silicon contaminated area; test the 180° peeling performance of the non-contaminated area (area not pasted with silicone protective film) and contaminated area with special adhesive tape NITTO 31B, constant speed is 300mm / min. Among them, the silicon transfer rate: (non-contaminated adhesion - contaminated adhesion) / non-contaminated adhesion) * 100%.

[0111] Table 1

[0112]

[0113] Table 2

[0114]

[0115] It can be seen from the detection data in Example 1 and Comparative Example 1 and Tables 1-2 that: in the present application, the A component and the B component are adjusted to a specific viscosity range by xylene, and the dispersion of the Si-H crosslinking agent in the system is improved by using the cooperation of the A component and the B component with two different viscosities, the reaction efficiency of the Si-H crosslinking agent is improved, and the migration of the Si-H crosslinking agent can be reduced.

[0116] It can be seen from the detection data in Example 1 and Comparative Example 2-4 and Tables 1-2 that: in the present application, the Si-H crosslinking agent specifically uses long-chain alkyl polyether modified hydrogen-containing silicone oil, which utilizes the hydrophobic effect of long-chain alkyl and the entanglement effect of polyether segment to promote the uniform dispersion of the Si-H crosslinking agent while improving the stability of the Si-H crosslinking agent, and further reduces the migration of the Si-H crosslinking agent.

[0117] It can be seen from the detection data in Example 1 and Examples 3-6 and Tables 1-2 that: in the Si-H crosslinking agent of the present application, the mono-alkenyl polyether is an allyl epoxy polyether with epoxy groups, and the fumed silica is a modified fumed silica obtained by using a vinyl silane coupling agent and an amino silane coupling agent for modification, wherein the epoxy groups in the allyl epoxy polyether react with the amino groups in the modified fumed silica, and the allyl groups in the modified fumed silica react with the Si-H bonds in the Si-H crosslinking agent, which is conducive to further improving the stability of the Si-H crosslinking agent and further improving the problem of easy precipitation of the Si-H crosslinking agent.

[0118] The above examples are only used to illustrate the technical solutions of the present application and not to limit the protection scope of the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A silicone protective film, characterized by: The silicone protective film comprises a substrate layer, a silicone layer and a release layer, and the silicone layer is obtained by baking and curing an organic silicone adhesive, wherein the organic silicone adhesive comprises component A, component B, Si-H crosslinking agent, inhibitor, catalyst and diluent; the raw materials of the component A are methylphenyl vinyl silicone rubber and fumed silica, the weight ratio of the methylphenyl vinyl silicone rubber to the fumed silica is (45-55):(4.3-5.6), and the viscosity is adjusted to 28000-32000 cp by using a dispersant; the raw material of the component B is methyl vinyl MQ silicone resin, and the viscosity is adjusted to 12000-18000 cp by using a dispersant; wherein the ratio of the molar amount of the vinyl in the methylphenyl vinyl silicone rubber, the molar amount of the vinyl in the methyl vinyl MQ silicone resin to the molar amount of the Si-H bond in the Si-H crosslinking agent is (0.65-0.75):(0.15-0.2):1; the Si-H crosslinking agent is long-chain alkyl polyether modified hydrogen-containing silicone oil; The long-chain alkyl polyether modified hydrogen-containing silicone oil is obtained by the silicon hydrogen addition reaction of monoalkenyl polyether, long-chain monoalkene and hydrogen-containing silicone oil; the molar ratio of C=C in the monoalkenyl polyether, C=C in the long-chain monoalkene and Si-H bond in the hydrogen-containing silicone oil is (0.1-0.2):(0.1-0.15):

1.

2. The silicone protective film according to claim 1, characterized in that: Me3SiO(Me2SiO) m (MeHSiO) n SiMe3, wherein m is 60-85 and n is 8-10.

3. The silicone protective film according to any one of claims 1-2, characterized in that: The monoalkenyl polyether is allyl epoxy polyether, the fumed silica is modified fumed silica, and the modified fumed silica is obtained by grafting modification of fumed silica by using vinyl silane coupling agent and amino silane coupling agent, wherein the weight ratio of the vinyl silane coupling agent, the amino silane coupling agent to the fumed silica is (1-1.5):(2.5-3.0):

100.

4. The silicone protective film according to any one of claims 1-2, characterized in that: The catalyst is platinum gold catalyst, and the mass of the platinum gold catalyst accounts for 0.01-0.02% of the mass of the Si-H crosslinking agent.

5. The silicone protective film according to any one of claims 1-2, characterized in that: The inhibitor is acetylenic alcohol inhibitor, and the mass of the acetylenic alcohol inhibitor accounts for 1.5-2.5% of the mass of the Si-H crosslinking agent.

6. The silicone protective film according to any one of claims 1-2, characterized in that: The mass of the diluent accounts for 10-20% of the mass of the Si-H crosslinking agent.

7. The method for preparing a silicone protective film according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: uniformly coating the organic silicone adhesive on one surface of the substrate layer, and then baking and curing to obtain the silicone layer; uniformly coating the release agent on the side of the silicone layer away from the substrate layer to form the release layer, thereby obtaining the silicone protective film.

8. The method for preparing a silicone protective film according to claim 7, characterized in that: The temperature during baking and curing is controlled to be 140-150 DEG C, and the time is 30-40 s.

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