Silica gel coating liquid, silica gel protective film and preparation method

Abstract

The invention discloses a silica gel coating liquid, a silica gel protective film and a preparation method, and relates to the technical field of electronic equipment. Comprising the following components in parts by weight: 50-60 parts of vinyl modified silicone oil, 8-15 parts of hydroxyl-terminated silicone oil, 30-40 parts of MQ silicon resin, 1-3 parts of high-hydrogen-content silicone oil, 0.5-2 parts of amino modified siloxane, 1-3 parts of organic silicon wax, 0.1-0.5 part of a platinum catalyst and 40-400 parts of methylbenzene. The MQ silicon resin is added into the hydroxyl-terminated silicone oil with high functionality and the vinyl modified silicone oil, and the hydrogen-containing silicone oil cross-linking agent with high hydrogen content is adopted, so that the cross-linking density is improved, the cohesive strength is enhanced, and the interfacial stripping force between the silica gel and the surface of a use layer is increased; and by adding the organic silicon wax, a waxy material formed by grafting and modifying organic silicon siloxane and other organic materials forms a nano-scale film layer, so that the smoothness is improved, and the film tearing hand feeling with a use layer is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic equipment, in particular to a silica gel coating liquid, a silica gel protective film and a preparation method. BACKGROUND

[0002] Electronic equipment refers to a device that uses electronic components to achieve a specific function. Its core is to process, transmit, store or convert electrical signals to complete tasks such as information processing, energy control and data interaction. It is widely used in various fields such as life, work, scientific research and industry.

[0003] The screen of an electronic device is the most fragile component on the electronic device. In order to protect the screen of the electronic device from damage, a protective sticker is usually attached to the surface of the screen. The protective sticker usually includes a functional layer, a base material layer, a pressure-sensitive adhesive layer and a release film layer stacked in turn. When in use, the release film is removed, the pressure-sensitive adhesive layer is attached to the surface of the screen, and the functional layer is on the surface. Since the protective sticker is prone to scratches and other problems during transportation and transfer, a protective film needs to be attached to the functional layer for protection, and the protective film needs to be removed when in use. The protective film includes a base material layer and a pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer is in contact with the functional layer of the protective sticker.

[0004] In recent years, in the field of mobile phone protective stickers, the functional layer often uses an anti-reflective coating AR or a hardening layer HC as the surface coating of the protective sticker, and then a silica gel protective film is used to protect the surface of the functional layer. When the silica gel protective film needs to be removed, the protective film has the problems of large film tearing force, heavy film tearing feel and difficulty in tearing open. Alternatively, the film tearing force is light, the film tearing feel is light, but the protective film is prone to reverse release, that is, when the release film of the protective sticker is removed, the silica gel protective film is delaminated from the surface coating of the functional layer, thereby affecting use, which needs to be improved. SUMMARY

[0005] Therefore, a first object of the present application is to provide a silica gel coating liquid to reduce the difficulty of tearing open and avoid the problem of reverse release. The specific scheme is as follows: A silica gel coating liquid, comprising 50-60 parts by weight of a vinyl-modified silicone oil, 8-15 parts by weight of a hydroxyl-terminated silicone oil, 30-40 parts by weight of an MQ silicone resin, 1-3 parts by weight of a high hydrogen-containing silicone oil, 0.5-2 parts by weight of an amino-modified siloxane, 1-3 parts by weight of a silicone wax, 0.1-0.5 parts by weight of a platinum catalyst and 40-400 parts by weight of a solvent.

[0006] Preferably, the high hydrogen-containing silicone oil has a hydrogen content of 1% to 1.6%.

[0007] Preferably, the vinyl-modified silicone oil is a vinyl-terminated polymethylvinylsiloxane, and the hydroxyl-terminated silicone oil is a hydroxyl-terminated polydimethylsiloxane.

[0008] Preferably, the silica gel coating solution further comprises 0.1-0.6 parts of an antioxidant.

[0009] Preferably, the antioxidant is a hindered phenolic antioxidant.

[0010] Preferably, the hindered phenolic antioxidant is 4-((4,6-dioctylthio-1,3,5-triazin-2-yl)amino)-2,6-di(1,1-methylethyl)phenol.

[0011] Preferably, the solvent is toluene and / or xylene.

[0012] A second object of the present application is to provide a silica gel protective film comprising a substrate layer and a silica gel pressure-sensitive adhesive layer prepared using the silica gel coating solution described above.

[0013] Preferably, the thickness of the substrate layer is 50-125 μm, and the thickness of the silica gel pressure-sensitive adhesive layer is 8-30 μm.

[0014] A third object of the present application is to provide a method for preparing a silica gel protective film, for preparing the silica gel protective film described above, comprising the following steps: Step 1, main glue premixing: pour part of the solvent into a container and stir, then add the vinyl-modified silicone oil and the hydroxyl-terminated silicone oil in sequence, stir until uniform, then add the MQ silicone resin, and stir until uniform to obtain the main glue; Step 2, small material premixing: divide the remaining solvent into multiple portions, each portion is added with the organosilica wax, the antioxidant, the amino-modified siloxane, the high-hydrogen silicone oil, and the platinum catalyst, and stirred until uniform, then added into the main glue in sequence, and each portion is stirred until uniform after addition, to obtain the small material mixture; Step 3, vacuum degassing: vacuumize to eliminate the bubbles in the small material mixture, to obtain the degassed glue; Step 4, coating and curing: coat the degassed glue on the surface of the substrate layer, and perform curing treatment to obtain the silica gel protective film.

[0015] It can be known from the above scheme that the present application provides a silica gel coating liquid, a silica gel protective film and a preparation method. The silica gel coating liquid, the silica gel protective film and the preparation method have the following advantages. The nano-scale network structure of the MQ resin can enhance the physical anchoring effect on the protected surface, without reducing the cohesive strength. The high hydrogen content hydrogen-containing silicone oil crosslinking agent is used to improve the crosslinking density, enhance the cohesive strength and increase the interfacial peeling force between the silica gel and the use layer surface. The wax-like material formed by grafting and modifying the organosilicon siloxane and other organic materials forms a nano-scale film layer, reduces the surface friction of the silica gel, improves the smoothness, and thus reduces the film tearing hand feeling of the use layer. The polar groups of the MQ resin can penetrate the silicone wax film and form strong adsorption with the protected surface, offset part of the blocking effect, so that the protective film has low film tearing hand feeling and high film tearing force at the same time. In addition, the antioxidant is added to prevent the degradation of the silicone oil during high-temperature curing, and to ensure the stability of the glue layer structure. The silica gel protective film has the effect of a 110-120° high water contact hardening film and an AR film surface protective film, and has the feasibility of a low water contact CPI, UTG cover plate surface protective film. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0017] It needs to be mentioned that the MQ silicone resin in the embodiments of the present application is DY-MQ803 purchased from Shandong Dayi Chemical Co., Ltd., the high hydrogen-containing silicone oil is SiSiB®HF2020 (hydrogen content 1.6%) purchased from Nanjing Xisibo Silicone Co., Ltd., the amino-modified siloxane is AC-21 purchased from Fangzhou (Fokang) Chemical Material Co., Ltd., the silicone wax is XIAMETER™ MEM-1728 Emulsion purchased from Dow Chemical Company, the platinum catalyst is PT-4000 purchased from Shenzhen Kanglibang Technology Co., Ltd., and the rest of the components are commercially available, which will not be repeated here. At the same time, the vinyl-modified silicone oil is a vinyl dimethyl-terminated polydimethylsiloxane purchased from Nanjing Xisibo Silicone Co., Ltd. SiSiB®VF6030-10000. The hydroxyl-terminated silicone oil is a hydroxyl-terminated polydimethylsiloxane purchased from Nanjing Xisibo Silicone Co., Ltd. SiSiB®OF0156B. The hindered phenolic antioxidant is 4-((4,6-dioctylthio-1,3,5-triazin-2-yl)amino)-2,6-di(1,1-methylethyl)phenol with the trade name AN 565 purchased from Qingdao Zhen Guang Functional Materials Technology Co., Ltd. The solvent is toluene and / or xylene. Of course, the solvent in the embodiments of the present application is toluene, but since xylene has a higher boiling point, toluene is preferred as the solvent in the embodiments of the present application to ensure the coating efficiency.

[0018] The following will specifically describe a silicone coating liquid, a silicone protective film and a preparation method according to the present application.

[0019] A silicone coating liquid comprises 50-60 parts by weight of a vinyl-modified silicone oil, 8-15 parts of a hydroxyl-terminated silicone oil, 30-40 parts of an MQ silicone resin, 1-3 parts of a high hydrogen-containing silicone oil, 0.5-2 parts of an amino-modified siloxane, 1-3 parts of a silicone wax, 0.1-0.5 parts of a platinum catalyst, and 40-400 parts of a solvent. The high hydrogen-containing silicone oil has a hydrogen content of 1%~1.6%. The vinyl-modified silicone oil is a vinyl-terminated polymethylvinylsiloxane. The hydroxyl-terminated silicone oil is a hydroxyl-terminated polydimethylsiloxane. The silicone coating liquid further comprises 0.1-0.6 parts of an antioxidant. The antioxidant is a hindered phenolic antioxidant, of course, other antioxidants can also be used, which will not be repeated here. And the hindered phenolic antioxidant used in the embodiments of the present application is 4-((4,6-dioctylthio-1,3,5-triazin-2-yl)amino)-2,6-di(1,1-methylethyl)phenol. The solvent is toluene and / or xylene.

[0020] A silicone protective film comprises a substrate layer and a silicone pressure-sensitive adhesive layer prepared by using the silicone coating liquid as described above.

[0021] A preparation method of a silica gel protective film, for preparing a silica gel protective film as described above, comprising the following steps: Step 1, main glue premixing: pour part of the solvent into a container and stir to form a vortex, control the stirring speed to be 300-500 rpm, then sequentially add the vinyl modified silicone oil and the hydroxyl-terminated silicone oil, after stirring to uniform, add the MQ silicone resin, and stir to uniform to obtain the main glue body; Step 2, small material premixing: take the remaining part of the solvent and divide it into multiple parts, each part is added with silicone wax, antioxidant, amino-modified siloxane, high hydrogen-containing silicone oil and platinum catalyst, and after stirring to uniform, sequentially add into the main glue body, and each part is stirred to uniform after addition, to obtain the small material mixture; Step 3, vacuum degassing: control the air pressure to be -0.09 to -0.1 MPa, vacuum for 0.5-2 hours, to eliminate the bubbles in the small material mixture, to obtain the degassed glue body; Step 4, coating and curing: the surface of the substrate layer with a thickness of 50-125 μm is subjected to corona treatment until the surface tension of the corona surface reaches 45-50 dyn / cm, then the degassed glue body is coated on the corona surface, control the temperature to be 100-150 ℃, and curing treatment for 10-15 minutes, to obtain the silica gel protective film with a thickness of 8-30 μm of the silica gel pressure-sensitive adhesive layer.

[0022] Example 1 A silica gel coating liquid, comprising 50 parts of vinyl modified silicone oil, 10 parts of hydroxyl-terminated silicone oil, 35 parts of MQ silicone resin, 2 parts of high hydrogen-containing silicone oil, 1.5 parts of amino-modified siloxane, 2 parts of silicone wax, 0.3 parts of hindered phenolic antioxidant, 0.3 parts of platinum catalyst, and 200 parts of solvent.

[0023] A silica gel protective film, comprising a substrate layer and a silica gel pressure-sensitive adhesive layer, the silica gel pressure-sensitive adhesive layer is prepared by using the silica gel coating liquid as described above.

[0024] A preparation method of a silica gel protective film, for preparing a silica gel protective film as described above, comprising the following steps: Step 1, main glue premixing: pour 150 parts of solvent into a container and stir to form a vortex, control the stirring speed to be 300 rpm, then sequentially add the vinyl modified silicone oil and the hydroxyl-terminated silicone oil, after stirring to uniform, add the MQ silicone resin, and stir to uniform to obtain the main glue body; Step 2, small material premixing: take the remaining part of the solvent and divide it into multiple parts, each part is added with silicone wax, antioxidant, amino-modified siloxane, high hydrogen-containing silicone oil and platinum catalyst, and after stirring to uniform, sequentially add into the main glue body, and each part is stirred to uniform after addition, to obtain the small material mixture; Step 3, Vacuum degassing: Control the air pressure to -0.09 to -0.1 MPa and evacuate for 1 hour to eliminate air bubbles in the mixture of small materials and obtain degassed colloid; Step 4, Coating and Curing: The surface of the 75μm thick PET substrate layer is corona treated until the surface tension of the corona surface reaches 48dyn / cm. Then, the degassing colloid is coated on the corona surface and cured at 100℃ for 15 minutes to obtain a silicone protective film with a silicone pressure-sensitive adhesive layer thickness of 10μm.

[0025] Example 2 A silicone coating liquid comprises, by weight, 55 parts of vinyl-modified silicone oil, 8 parts of hydroxyl-terminated silicone oil, 30 parts of MQ silicone resin, 1 part of high-hydrogen silicone oil, 0.5 parts of amino-modified siloxane, 1 part of organosilicon wax, 0.1 parts of hindered phenolic antioxidant, 0.1 parts of platinum catalyst, and 160 parts of solvent.

[0026] A silicone protective film includes a substrate layer and a silicone pressure-sensitive adhesive layer, wherein the silicone pressure-sensitive adhesive layer is prepared using a silicone coating solution as described above.

[0027] A method for preparing a silicone protective film, comprising the following steps: Step 1, Premixing the main adhesive: Pour 110 parts of solvent into a container and stir to form a vortex. Control the stirring speed to 400 rpm. Add vinyl modified silicone oil and hydroxyl-terminated silicone oil in sequence. Stir until uniform and then add MQ silicone resin. Stir until uniform to obtain the main adhesive. Step 2, Premixing of small components: Take the remaining solvent and divide it into multiple portions. Add organosilicon wax, antioxidant, amino-modified siloxane, high-hydrogen silicone oil and platinum catalyst to each portion respectively. After stirring evenly, add them to the main colloid in sequence. Stir evenly after each addition to obtain the small component mixture. Step 3, Vacuum degassing: Control the air pressure to -0.09 to -0.1 MPa and evacuate for 1 hour to eliminate air bubbles in the mixture of small materials and obtain degassed colloid; Step 4, Coating and Curing: The surface of the 75μm thick PET substrate layer is corona treated until the surface tension of the corona surface reaches 48dyn / cm. Then, the degassing colloid is coated on the corona surface and cured at 120℃ for 13 minutes to obtain a silicone protective film with a silicone pressure-sensitive adhesive layer thickness of 8μm.

[0028] Example 3 A silicone coating liquid comprises, by weight, 60 parts of vinyl-modified silicone oil, 15 parts of hydroxyl-terminated silicone oil, 40 parts of MQ silicone resin, 3 parts of high-hydrogen silicone oil, 2 parts of amino-modified siloxane, 3 parts of organosilicon wax, 0.6 parts of hindered phenolic antioxidant, 0.5 parts of platinum catalyst, and 400 parts of solvent.

[0029] A silicone protective film includes a substrate layer and a silicone pressure-sensitive adhesive layer, wherein the silicone pressure-sensitive adhesive layer is prepared using a silicone coating solution as described above.

[0030] A method for preparing a silicone protective film, comprising the following steps: Step 1, Premixing the main adhesive: Pour 300 parts of solvent into a container and stir to form a vortex. Control the stirring speed to 500 rpm. Add vinyl modified silicone oil and hydroxyl-terminated silicone oil in sequence. Stir until uniform and then add MQ silicone resin. Stir until uniform to obtain the main adhesive. Step 2, Premixing of small components: Take the remaining solvent and divide it into multiple portions. Add organosilicon wax, antioxidant, amino-modified siloxane, high-hydrogen silicone oil and platinum catalyst to each portion respectively. After stirring evenly, add them to the main colloid in sequence. Stir evenly after each addition to obtain the small component mixture. Step 3, Vacuum degassing: Control the air pressure to -0.09 to -0.1 MPa and evacuate for 1 hour to eliminate air bubbles in the mixture of small materials and obtain degassed colloid; Step 4, Coating and Curing: The surface of the 75μm thick PET substrate layer is corona treated until the surface tension of the corona surface reaches 48dyn / cm. Then, the degassing colloid is coated on the corona surface and cured at 150℃ for 10 minutes to obtain a silicone protective film with a silicone pressure-sensitive adhesive layer thickness of 12μm.

[0031] Example 4 The difference between Example 4 and Example 1 is that no hindered phenolic antioxidants were added in Example 4.

[0032] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the amount of silicone wax added in Comparative Example 1 is 5 parts.

[0033] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that no silicone wax was added in Comparative Example 2.

[0034] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that in Comparative Example 3, a hydrogen-containing silicone oil with a hydrogen content of 0.7-0.78% (purchased from Guangzhou Zhonghaojing Polymer Materials Co., Ltd., brand name Skytech®SHS075) was used instead of a high-hydrogen-content silicone oil.

[0035] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that no amino-modified siloxane was added in Comparative Example 4.

[0036] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that the amount of MQ silicone resin added in Comparative Example 5 is 20 parts.

[0037] Comparative Example 6 The difference between Comparative Example 6 and Example 1 is that the amount of hydroxyl-terminated silicone oil added in Comparative Example 6 is 5 parts.

[0038] Performance testing: (1) Peel force test: Referring to ASTM D3330 standard, the adhesive surface was bonded to a steel plate (surface roughness Ra 0.8-1.6μm) or a 115° AF glass plate, with a peeling speed of 300mm / min. After being placed at (23±2℃, 55±5%RH) for 24h, the 180° peel force was tested. The test was repeated 5 times and the average value was taken.

[0039] (2) Evaluation of the feel of tearing the film: Subjective evaluation method: 10 people in a group score (1-5 points, 1-2 = severe, 3 = moderate, 4-5 = mild), and take the average score.

[0040] (3) Temperature resistance verification: After high-temperature aging test (150℃×24h), referring to ASTM D3330 standard, a steel plate (surface roughness Ra0.8-1.6μm) was bonded together at a peeling speed of 300mm / min. After being placed at (23±2℃, 55±5%RH) for 24h, the 180° peel force was tested. The test was repeated 5 times and the average value was taken.

[0041] (4) Light transmittance test: Tested using a UV-Vis spectrophotometer.

[0042] The performance test results are shown in Table 1 below.

[0043] Table 1 Performance Test Results

[0044] As shown in Table 1 above, the silicone protective films in Examples 1 to 4 exhibit high tear strength and a smooth tearing feel. Furthermore, due to the addition of hindered phenolic antioxidants, the aging resistance of the silicone protective films in Examples 1 to 3 is superior to that in Example 4. In contrast, in Comparative Example 1, the excessive use of silicone wax resulted in a significant reduction in tear strength and tearing feel while improving the anti-sticking effect, making the silicone protective film easily peel off from the substrate and fail.

[0045] Comparative Example 2, lacking the addition of silicone wax, exhibited high tear strength and a heavy tearing feel. Comparative Example 3, with its low hydrogen content in the hydrogen-containing silicone oil, resulted in incomplete curing of the adhesive layer, silicone oil precipitation, fogging, and low light transmittance. Comparative Example 4, lacking the addition of amino-modified siloxane, resulted in high tear strength, a moderate tearing feel, and issues with residue, glue shedding, and separation from PET during peel strength testing. Comparative Example 5, with insufficient MQ silicone resin, resulted in low tear strength, a mild tearing feel, and decreased peel strength. Comparative Example 6, with insufficient hydroxyl-terminated silicone oil, resulted in low tear strength, a moderate tearing feel, and reduced light transmittance.

[0046] In summary, this application provides a silicone coating liquid, a silicone protective film, and a preparation method thereof. The silicone coating liquid, silicone protective film, and preparation method involve adding MQ resin to high-functionality terminal hydroxyl silicone oil and vinyl-modified silicone oil. The nanoscale network structure of MQ resin enhances the physical anchoring effect on the protected surface without reducing cohesive strength. A high-hydrogen-content hydrogen-containing silicone oil crosslinking agent is used to increase the crosslinking density, enhance cohesive strength, and increase the interfacial peel force between the silicone and the surface of the application layer. Furthermore, the addition of organosilicon wax allows a waxy material, grafted and modified from organosilicon siloxanes and other organic materials, to form a nanoscale film layer, reducing surface friction and improving smoothness, thereby reducing the peeling feel of the application layer. The polar groups of MQ resin can penetrate the silicone wax film and form strong adsorption with the protected surface, offsetting some of the barrier effect, resulting in a protective film with both low peeling feel and high peeling force. In addition, antioxidants are added to prevent silicone oil degradation during high-temperature curing, ensuring the stability of the adhesive layer structure. This silicone protective film has the effect of serving as a surface protective film for 110-120° high water-tack hardening film and AR film, and it is also feasible as a surface protective film for low water-tack CPI and UTG cover plates.

[0047] The terms “first,” “second,” “third,” “fourth,” etc., used in this application (if applicable) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, or apparatus.

[0048] It should be noted that the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0049] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A silicone coating liquid, characterized in that: It includes 50-60 parts by weight of vinyl-modified silicone oil, 8-15 parts of hydroxyl-terminated silicone oil, 30-40 parts of MQ silicone resin, 1-3 parts of high-hydrogen silicone oil, 0.5-2 parts of amino-modified siloxane, 1-3 parts of organosilicon wax, 0.1-0.5 parts of platinum catalyst, and 40-400 parts of solvent.

2. The silicone coating liquid according to claim 1, characterized in that: The hydrogen content of the high-hydrogen silicone oil is 1% to 1.6%.

3. The silicone coating liquid according to claim 1, characterized in that: The vinyl-modified silicone oil is vinyl-terminated polymethylvinylsiloxane; the hydroxyl-terminated silicone oil is hydroxyl-terminated polydimethylsiloxane.

4. The silicone coating liquid according to claim 1, characterized in that: The silicone coating also includes 0.1-0.6 parts of antioxidant.

5. The silicone coating liquid according to claim 4, characterized in that: The antioxidant is a hindered phenolic antioxidant.

6. The silicone coating liquid according to claim 5, characterized in that: The hindered phenolic antioxidant is 4-((4,6-dioctylthio-1,3,5-triazine-2-yl)amino)-2,6-bis(1,1-methylethyl)phenol.

7. The silicone coating liquid according to claim 1, characterized in that: The solvent is toluene and / or xylene.

8. A silicone protective film, comprising a substrate layer and a silicone pressure-sensitive adhesive layer, characterized in that: The silicone pressure-sensitive adhesive layer is prepared using a silicone coating solution as described in any one of claims 1-7.

9. A silicone protective film according to claim 8, characterized in that: The thickness of the substrate layer is 50-125μm, and the thickness of the silicone pressure-sensitive adhesive layer is 8-30μm.

10. A method for preparing a silicone protective film, used to prepare a silicone protective film as described in claim 8 or 9, characterized in that, Includes the following steps: Step 1, Premixing the main adhesive: Pour some solvent into a container and stir. Add vinyl-modified silicone oil and hydroxyl-terminated silicone oil in sequence. Stir until uniform, then add MQ silicone resin and stir until uniform to obtain the main adhesive. Step 2, Premixing of small components: Take the remaining solvent and divide it into multiple portions. Add organosilicon wax, antioxidant, amino-modified siloxane, high-hydrogen silicone oil and platinum catalyst to each portion respectively. After stirring evenly, add them to the main colloid in sequence. Stir evenly after each addition to obtain the small component mixture. Step 3, Vacuum degassing: Vacuum is drawn to eliminate air bubbles in the mixture of small materials and obtain degassed colloid; Step 4, Coating and Curing: Coat the degassing colloid onto the surface of the substrate layer and cure it to obtain a silicone protective film.

Images