A swelling agent for removing a cured thin layer of addition type high temperature vulcanized silicone rubber and a method for preparing the same

Abstract

This application relates to the field of technical solutions, and more specifically, to a swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers and its preparation method. It comprises the following raw materials in weight percentages: main solvent 50-90%; auxiliary solvent 13-60%; co-solvent 3-10%; activity accelerator 0.1-1%; the balance being processing aids; wherein the activity accelerator is a fatty alcohol polyoxyethylene ether-based activator; the main solvent is petroleum ether; the auxiliary solvent is composed of 120# solvent oil and light paraffin oil; the co-solvent is an alcohol solvent; the total weight percentage of the main solvent, auxiliary solvent, co-solvent, activity accelerator, and processing aids equals 100%. The resulting swelling agent exhibits good stability and has a good removal effect on cured addition-type high-temperature vulcanized silicone rubber thin layers.

Description

Technical Field

[0001] This application relates to the field of technical solutions, and more specifically, it relates to a swelling agent for removing a cured addition-type high-temperature vulcanized silicone film and a method for preparing the same. Background Technology

[0002] Protective films are widely used in many fields such as electronics, optics, and packaging. They play a vital role in enhancing product appearance, protecting product surfaces, and improving product performance. With the continuous development of these fields, higher demands are being placed on the quality, performance, and effectiveness of protective films. In the manufacturing process of protective films, removing the already coated and cured addition-type high-temperature vulcanized silicone film is a critical and common requirement, which is essential for ensuring the quality, performance, and subsequent effectiveness of the protective film.

[0003] Currently, some mixed solvents are available on the market for dissolving or swelling cured silicone rubber, addressing issues related to the removal or swelling of cured silicone. However, in terms of applicable silicone types, most existing mixed solvents are only suitable for room temperature curing condensation silicone. Room temperature curing condensation silicone and high-temperature curing addition silicone differ significantly in chemical structure and curing mechanism. Therefore, these solvents have negligible effect on removing swelling in already cured high-temperature curing addition silicone. From the perspective of solvent form, single-component solvents also have limited effect on the swelling of already cured high-temperature curing addition silicone. Single-component solvents have relatively simple compositions, resulting in a limited interaction with high-temperature curing addition silicone, making it difficult to effectively disrupt the cured structure of the silicone and penetrate deeply into the silicone to achieve sufficient swelling.

[0004] Existing solvent formulations primarily focus on removing condensation-type room-temperature vulcanizing silicone rubber. Their effectiveness is extremely limited for cured addition-type high-temperature vulcanizing silicone rubber. In practical applications, especially in protective film production, existing solutions are extremely inefficient at removing the cured addition-type high-temperature vulcanizing silicone rubber layer from protective films. Operators need to spend a significant amount of time and effort on repeated treatments to barely achieve a certain level of removal. Moreover, existing solutions rarely completely remove the silicone surface, and residual silicone may affect the adhesion of the protective film to other components and its optical properties. More seriously, during the removal process, existing solutions can easily damage the protective film substrate, leading to problems such as discoloration, deformation, and reduced strength. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical problems and provide a swelling agent for removing cured addition-type high-temperature vulcanized silicone thin layers and a preparation method thereof.

[0006] In a first aspect, a swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers comprises the following raw materials by weight percentage: Main solvent 50-90%; Co-solvent 13-60%; 3-10% co-solvent; Activity accelerator 0.1-1%; The remainder is processing aids; The active accelerator is a fatty alcohol polyoxyethylene ether-based activator; the main solvent is petroleum ether; the auxiliary solvent is composed of 120# solvent oil and light paraffin oil; the co-solvent is an alcohol solvent; the total weight percentage of the main solvent, auxiliary solvent, co-solvent, active accelerator, and processing aid is equal to 100%.

[0007] By adopting the above technical solution, a three-phase compound swelling agent is prepared, using petroleum ether as the main component, 120# solvent oil as an auxiliary component, and light liquid paraffin oil as a supplementary component. The petroleum ether mainly consists of C5 and C6 aliphatic hydrocarbons, the 120# solvent oil mainly consists of C6 and C7 aliphatic hydrocarbons, and the light liquid paraffin oil mainly consists of C10-C12 aliphatic hydrocarbons. These three components are all non-polar solvents mainly composed of aliphatic hydrocarbons and are completely miscible with each other, thus forming a mixed solution system covering a continuous component range of C5-C12 aliphatic hydrocarbons. The components of this system work synergistically to effectively swell cured addition-type high-temperature vulcanized silicone rubber thin layers, exhibiting excellent dissolving and penetrating abilities, and significantly improving the treatment effect on cured silicone rubber thin layers.

[0008] The light liquid paraffin oil (mainly composed of C10-C12 aliphatic hydrocarbons), with its large molecular weight, can effectively slow down the evaporation rate of other solvents in the mixed solution. Simultaneously, its low surface tension allows for thorough wetting of the cured addition-type high-temperature vulcanized silicone rubber surface, significantly improving the system's wetting and penetration efficiency of the silicone thin layer, thereby accelerating the silicone swelling process and creating favorable conditions for subsequent rapid silicone removal. Furthermore, the evaporation rate of the entire system can be flexibly controlled by adjusting the proportion of light liquid paraffin oil added in this application to adapt to different application scenarios. Introducing a co-solvent into the system not only allows for targeted adjustment of the polarity of the mixed solution and enhances the swelling capacity of the main solvent for silicone (i.e., providing a co-solvent effect), but also simultaneously dissolves any small amounts of polar substances that may be present in the system, further optimizing the solution's stability and cleaning effect.

[0009] The fatty alcohol polyoxyethylene ether-based surfactant significantly reduces the surface tension of the three-phase mixed solution (petroleum ether, 120# solvent oil, and light liquid paraffin oil), further enhancing the system's ability to spread, wet, and penetrate the cured addition-type high-temperature vulcanized silicone rubber thin layer. This surfactant, in synergy with raw materials such as light liquid paraffin oil, can construct a thermodynamically stable swelling agent system, effectively inhibiting instability phenomena such as stratification and rapid evaporation of the swelling agent during storage and use, extending its shelf life and ensuring consistent use. Simultaneously, during cleaning, this stable system enables rapid and efficient peeling and removal of the silicone rubber thin layer, while maximizing the protection of the substrate surface integrity, significantly improving the overall quality and reliability of the cleaning process.

[0010] Preferably, the fatty alcohol polyoxyethylene ether-based activator is fatty alcohol polyoxyethylene ether AEO-3 and / or fatty alcohol polyoxyethylene ether AEO-7.

[0011] By adopting the above technical solution, fatty alcohol polyoxyethylene ether AEO-3, as an active agent containing fatty alcohol polyoxyethylene ether groups, can reduce the surface tension of the mixed solution, thereby promoting wetting and penetration, enhancing the swelling ability of the swelling agent on the silica gel thin layer, improving cleaning efficiency, and thus improving the cleaning effect. Simultaneously, fatty alcohol polyoxyethylene ether AEO-3 exhibits good chemical stability, will not decompose or deteriorate, and can synergistically maintain the uniform physical state of the swelling agent with other components, making it less prone to stratification or precipitation. Furthermore, it has a certain degree of temperature adaptability, further improving the stability of the swelling agent during use or storage, and enhancing its practicality.

[0012] Preferably, the fatty alcohol polyoxyethylene ether-based surfactant is composed of a fatty alcohol polyoxyethylene ether-based compound and a penetration-directing agent; the penetration-directing agent is one or more of the following: polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene.

[0013] By adopting the above technical solution, the fatty alcohol polyoxyethylene ether-based surfactant is composed of fatty alcohol polyoxyethylene ether-based compounds and penetration-directing agents (one or more of the following: polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene), which can significantly improve the cleaning effect of the swelling agent on the silicone film.

[0014] In terms of cleaning effect, the fatty alcohol polyoxyethylene ether compound and the penetration guide work synergistically to enhance the swelling ability of the swelling agent on the silicone film, promote the decomposition of the silicone film, reduce surface tension, guide the swelling agent to penetrate in the most effective direction, so that the swelling agent can penetrate into the silicone film more efficiently, avoid local insufficient or excessive penetration, and optimize the wettability of the swelling agent, so that it can cover the surface of the silicone film more evenly, improve the penetration ability, and thus remove silicone quickly, deeply and completely.

[0015] In terms of stability, both exhibit good chemical stability, do not decompose or deteriorate, and maintain a uniform physical state of the swelling agent, making it less prone to stratification or precipitation. They also have a certain degree of temperature adaptability, ensuring the stability of the swelling agent during use or storage and improving its practicality.

[0016] Preferably, the weight ratio of the polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene is 1:(0.1-0.5):(0.1-0.3).

[0017] By adopting the above technical solution, using petroleum ether as the main solvent, 120# solvent oil and light paraffin oil as auxiliary solvents, alcohol solvents as co-solvents, fatty alcohol polyoxyethylene ether-based surfactants as activity promoters, and benzotriazole and / or vanillin as processing aids, a three-phase compound swelling agent can be formed to synergistically swell the cured addition-type high-temperature vulcanized silicone rubber thin layer. Light paraffin oil can prevent the solvent from evaporating rapidly, wet and penetrate the silicone rubber surface, and adjust the evaporation rate of the mixed solution. The co-solvent can adjust the polarity of the mixed solution and dissolve a small amount of polar substances. The fatty alcohol polyoxyethylene ether-based surfactant can reduce the surface tension of the mixed solution and play a role in spreading, wetting and penetrating.

[0018] When the fatty alcohol polyoxyethylene ether-based surfactant is composed of fatty alcohol polyoxyethylene ether-based compounds and penetration-directing agents, it effectively balances the contradictions between the storage stability and controllability of the swelling agent product and the high efficiency and residue-free removal, thereby achieving precise, deep and complete removal of cured silicone.

[0019] Furthermore, the penetration-directing agent is a compound system composed of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene in a weight ratio of 1:(0.1-0.5):(0.1-0.3). This specific ratio produces a significant multidimensional synergistic effect: In terms of penetration removal, based on a multi-level synergistic mechanism of "physical wedging-interface wetting-chemical anchoring", this system can achieve rapid, deep and non-destructive swelling removal of dense cross-linked silicone networks.

[0020] Regarding system stability, a triple stabilization mechanism of "component compatibility, structural support, and density harmonization" ensures consistent product performance during storage and use. Specifically, low molecular weight polyisobutylene utilizes its viscosity and film-forming properties to form a coating network within the system, effectively restricting the movement and aggregation of molecules in each component. It works in conjunction with the other two components to construct a stable swelling environment, thereby ensuring the continuity and effectiveness of the permeation-directing effect.

[0021] Preferably, the low molecular weight polyisobutylene has a molecular weight of 500-1000.

[0022] By adopting the above technical solution, a swelling agent is composed of petroleum ether as the main solvent, 120# solvent oil and light paraffin oil as auxiliary solvents, alcohol solvents as co-solvents, fatty alcohol polyoxyethylene ether-based surfactants as activity promoters, and benzotriazole and / or vanillin as processing aids. This agent can synergistically swell the already cured addition-type high-temperature vulcanized silicone rubber thin layer, adjust the polarity of the mixed solution, dissolve a small amount of polar substances, reduce the surface tension of the mixed solution, play a role in spreading and penetrating, reduce damage to the metal substrate, harmonize the odor of the mixed solution, add a light sweet fragrance, and play an antioxidant role. The fatty alcohol polyoxyethylene ether-based surfactant is composed of fatty alcohol polyoxyethylene ether-based compounds and penetrating... The guiding agent composition resolves the contradictions between storage stability, controllability of use, and high removal efficiency and residue-free properties of swelling agents, achieving precise, deep, and complete removal of cured silicone. A specific weight ratio of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene creates a multi-dimensional synergistic penetration-promoting effect, enabling rapid, deep, and non-destructive removal of the dense cross-linked silicone network. The low molecular weight polyisobutylene (500-1000) better fulfills its role in the swelling agent, such as physically widening the gaps between silicone molecules and working with other components to create a stable swelling environment. This enhances the removal capacity of the swelling agent while further improving its stability during storage and use.

[0023] Preferably, the processing aid consists of benzotriazole and vanillin.

[0024] By adopting the above technical solution, the addition of benzotriazole can reduce the damage to the metal substrate when removing the swollen silicone thin layer, thus playing a role in metal corrosion inhibition; vanillin can harmonize the odor of the mixed solution and add a light sweet fragrance, and its phenolic hydroxyl group plays an antioxidant role, which has a synergistic effect with the penetration guide and benzotriazole, ensuring that the metal surface is not affected during use, and ensuring the stability of the entire swelling agent during use and storage.

[0025] Preferably, the swelling agent contains 0.2 wt% benzotriazole and 0.3 wt% vanillin.

[0026] By adopting the above technical solution, the swelling agent is composed of a main solvent, a secondary solvent, a co-solvent, an active accelerator, and a processing aid. The main solvent is petroleum ether, the secondary solvent is composed of 120# solvent oil and light paraffin oil, the co-solvent is an alcohol solvent, and the active accelerator is an active agent containing fatty alcohol polyoxyethylene ether groups. These components can work together to swell the cured addition-type high-temperature vulcanized silicone rubber thin layer. The light paraffin oil can prevent the solvent from evaporating rapidly, wetting and penetrating the silicone rubber surface, and adjusting the evaporation rate of the mixed solution. The co-solvent can adjust the polarity of the mixed solution and dissolve a small amount of polar substances. The active accelerator can reduce the polarity of the mixed solution. The low surface tension of the mixed solution facilitates wetting and penetration. Furthermore, processing aids include benzotriazole and vanillin. Benzotriazole reduces damage to the metal substrate, while vanillin harmonizes the odor of the mixed solution, adds a sweet aroma, and its phenolic hydroxyl groups act as antioxidants, synergizing with other components to ensure the stability of the swelling agent during use and storage. Additionally, the presence of 0.2 wt% benzotriazole and 0.3 wt% vanillin in the swelling agent ensures that the swelling agent does not affect the metal surface during use and maintains stability throughout its use and storage.

[0027] Preferably, in the swelling agent, the 120# solvent oil is 10-50 wt% and the light paraffin oil is 3-10 wt%.

[0028] By adopting the above technical solution, a three-phase compound swelling agent is composed of petroleum ether as the main solvent and 120# solvent oil and light paraffin oil as auxiliary solvents. This agent can synergistically swell the cured addition-type high-temperature vulcanized silicone rubber thin layer. The light paraffin oil can prevent the solvent from evaporating rapidly. Its low surface tension allows it to wet the silicone rubber surface, achieving wetting and penetration, which facilitates the rapid removal of the silicone rubber thin layer. Furthermore, the evaporation rate of the mixed solution can be adjusted by changing its ratio. At the same time, by mixing 120# solvent oil and light paraffin oil in the above ratio, the swelling agent can better exert its function of swelling and removing the cured addition-type high-temperature vulcanized silicone rubber thin layer.

[0029] Preferably, the alcohol solvent is one or a combination of ethanol, butanol, and propanol.

[0030] By adopting the above technical solution, a swelling agent is composed of petroleum ether as the main solvent, 120# solvent oil and light paraffin oil as auxiliary solvents, alcohol solvents as co-solvents, fatty alcohol polyoxyethylene ether-based activators as activity promoters, and benzotriazole and / or vanillin as processing aids. This agent can synergistically swell the already cured addition-type high-temperature vulcanized silicone rubber thin layer. Light paraffin oil can prevent the solvent from evaporating rapidly, wet and penetrate the silicone rubber surface, and adjust the evaporation rate of the mixed solution. The activity promoter can reduce the surface tension of the mixed solution and play a role in wetting and penetration. Benzotriazole can reduce damage to the metal substrate. Vanillin can adjust the odor of the mixed solution, increase the sweetness, play an antioxidant role, and synergize with other components to ensure the stability of the swelling agent. When the alcohol solvent is one or more of ethanol, butanol, and propanol, it can adjust the polarity of the mixed solution, play the role of co-solvent, and can dissolve a small amount of polar substances.

[0031] Preferably, it is obtained by the following method: Step 1: Add the activity promoter and processing aid to the co-solvent, stir thoroughly, let stand for 3 minutes, filter, and obtain mixed solution A; Step 2: Add mixed solution A to No. 120 solvent oil, mix evenly, and obtain mixed solution B; Step 3: Add light paraffin oil to the main solvent, mix evenly, and obtain mixed solution C; Step 4: Mix mixed solution B and mixed solution C evenly, store in the dark, and obtain swelling agent.

[0032] By adopting the above technical solution, and mixing, filtering, and storing the activity promoter, processing aid, co-solvent, No. 120 solvent oil, light paraffin oil, and main solvent in sequence according to specific steps, a swelling agent for removing the cured addition-type high-temperature vulcanized silicone film can be prepared. This ensures that all components are fully mixed and that the effective components are retained, providing a basis for the swelling agent to play its role in removing the silicone film.

[0033] In summary, this application includes at least one of the following beneficial technical effects: 1. A three-phase compound swelling agent is formulated with petroleum ether as the main component, 120# solvent oil as an auxiliary component, and light paraffin oil as an adjunct. The three phases can work together to swell and solidify addition-type high-temperature vulcanized silicone thin layers, which are easy to remove quickly. 2. Adding a solubilizer can adjust the polarity of the mixed solution, thus acting as a solubilizer, and can also dissolve a small amount of polar substances; 3. Active agents containing fatty alcohol polyoxyethylene ether groups can reduce the surface tension of the mixed solution, thereby promoting wetting and penetration. 4. When fatty alcohol polyoxyethylene ether-based surfactants are composed of fatty alcohol polyoxyethylene ether-based compounds and penetration-directing agents, they can resolve the contradictions between the storage stability and controllability of swelling agent products, and between high removal efficiency and no residue, thus achieving precise, deep, and complete removal of cured silicone. 5. A combination of three compounds—polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene—can achieve multi-dimensional synergistic penetration promotion and build a stable system. 6. Adding benzotriazole can reduce damage to metal substrates, vanillin can adjust the odor of the mixed solution and add a sweet aroma, its phenolic hydroxyl groups have an antioxidant effect, and it has a synergistic effect with other ingredients to ensure the stability of the swelling agent during use and storage. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the embodiments.

[0035] Sources of some raw materials: The HLB values ​​of fatty alcohol polyoxyethylene ether AEO-3 and fatty alcohol polyoxyethylene ether AEO-7 are both 6-7. Light paraffin oil No. 36; Petroleum ether No. 60; Polyethylene oxide-polypropylene oxide-polyethylene oxide is a three-stage copolymer with the following molecular structure: n and m are both 1-10, and the relative molecular weight is 500-2000.

[0036] The brand and model of hydrophilic double-ended epoxy polyether silicone oil is IOTA IOTA EES22KF; Low molecular weight polyisobutylene, with a relative molecular weight of 500-1000; Vanillin CAS No.: 121-33-5. Example

[0037] Example 1 A swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers is obtained by the following method; Step 1: According to the weight percentage, add 0.1% of the activity promoter and 0.9% of the processing aid to 3% of the cosolvent. Stir for 3 minutes at a stirring speed of 100 r / min to ensure thorough mixing. Let stand for 3 minutes and filter through a 500-mesh filter. The filtrate obtained is mixed solution A. Step 2: According to the weight percentage, add all of the mixed solution A to 40% of No. 120 solvent oil, stir for 3 minutes at a stirring speed of 100 r / min, and mix thoroughly to obtain mixed solution B; Step 3: Add 6% light paraffin oil to 50% main solvent by weight percentage, stir for 3 minutes at a stirring speed of 100 r / min, and mix thoroughly to obtain mixed solution C; Step 4: Mix all of the mixed solutions B and C together for 3 minutes at a stirring speed of 100 r / min to ensure thorough mixing. Place the mixture in a brown glass bottle and store it away from light to obtain the swelling agent.

[0038] The processing aid consists of benzotriazole and vanillin in a weight ratio of 0.6:0.3; the main solvent is petroleum ether; the auxiliary solvent consists of 120# solvent oil and light paraffin oil; the co-solvent is an alcohol solvent; the total weight percentage of the main solvent, auxiliary solvent, co-solvent, activity promoter, and processing aid equals 100%; the alcohol solvent is ethanol. The amounts of the raw materials are detailed in Table 1. The fatty alcohol polyoxyethylene ether-based activator consists of fatty alcohol polyoxyethylene ether AEO-3 and fatty alcohol polyoxyethylene ether AEO-7 in a weight ratio of 3:1.

[0039] Example 2-3 The difference between Examples 2-3 and Example 1 is that the amount of raw materials used is different, as shown in Table 1. Table 1. Raw material usage in Examples 1-3

[0040] Example

[0041] Example 4 is similar to Example 2 in that: the fatty alcohol polyoxyethylene ether-based surfactant is composed of a fatty alcohol polyoxyethylene ether-based compound and a penetration-directing agent in a weight ratio of 1:1; the fatty alcohol polyoxyethylene ether-based compound is composed of fatty alcohol polyoxyethylene ether AEO-3 and fatty alcohol polyoxyethylene ether AEO-7 in a weight ratio of 3:1; and the penetration-directing agent is polyethylene oxide-polypropylene oxide-polyethylene oxide.

[0042] Example 5 The similarity between Example 5 and Example 4 is that the penetration guiding agent is a hydrophilic double-ended epoxy polyether silicone oil.

[0043] Example 6 The similarity between Example 6 and Example 4 is that the penetration guiding agent is low molecular weight polyisobutylene.

[0044] Example 7 The similarity between Example 7 and Example 4 is that the penetration guiding agent is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide and hydrophilic double-ended epoxy polyether silicone oil in a weight ratio of 3:1.

[0045] Example 8 The similarity between Example 8 and Example 4 is that the penetration guiding agent is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene in a weight ratio of 1:0.2:0.3.

[0046] Example 9 The similarity between Example 9 and Example 4 is that the penetration guiding agent is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene in a weight ratio of 1:0.4:0.1.

[0047] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that the active promoter was replaced with the main solvent in equal amounts.

[0048] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that the active accelerator was replaced with other surfactants (e.g., NP-10, HLB 12-13) in equal amounts.

[0049] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that light paraffin oil was replaced with an equal amount of 120# solvent oil.

[0050] Comparative Example 4 The difference between Comparative Example 4 and Example 2 is that 120# solvent oil was replaced with an equal amount of the main solvent.

[0051] Experimental testing The swelling agents obtained in Examples 1-9 and Comparative Examples 1-4 were used in the following experimental tests.

[0052] 1) Cleaning effect Target for removal: A 0.1mm thick addition-cured, high-temperature vulcanized silicone layer formed on an aluminum plate; Contact residence time of the expanding agent: 5s, 10s; Addition-type high-temperature vulcanized silicone thin film: an organosilicon material that achieves vulcanization based on the hydrosilylation reaction of vinyl groups with silane groups; Cleaning scraper: A 1mm thick plastic sheet made of polytetrafluoroethylene, with an arc-shaped edge that contacts the silicone thin layer, the diameter of which is 1mm. Specific procedure: First, fix a 0.1mm thick addition-cured high-temperature vulcanized silicone film on the aluminum plate onto the experimental table. Then, spray or drip the swelling agent obtained in Examples 1-9 and Comparative Examples 1-4 onto the surface of the 0.1mm thick addition-cured high-temperature vulcanized silicone film on the aluminum plate, ensuring full contact with the surface. The amount of swelling agent used is 50g / m². 2 Then, a scraping device is used to drive a polytetrafluoroethylene plastic sheet to scrape off all the silicone layer on the aluminum plate (the plastic sheet forms a 45° angle with the aluminum plate surface), with a scraping force of 0.5 N, a scraping speed of 100 mm / min, and one scraping pass per stroke. The contact residence time of the expanding agent is tested at 5 s and 10 s respectively to obtain a scraping sample. The scraped sample was visually observed using a 70x magnifying glass, and further verified using infrared detection technology. Based on the observation and detection results, the actual coverage area of ​​the residual silicone layer was calculated, and the residual adhesive rate was then calculated using the following formula: Residual adhesive rate (%) = (Actual coverage area of ​​residual silicone film / Original coverage area of ​​silicone film) × 100%.

[0053] Residual glue content grade: Grade A: A < 0.001%; ​​Grade B: 0.001% ≤ B < 0.01%; Grade C: 0.01% ≤ C < 0.1%; Grade D: 0.1% ≤ B < 1%; Grade E: E ≥ 1%.

[0054] 2) Quality stability The swelling agents obtained in Examples 1-9 and Comparative Examples 1-4 were sealed in brown glass bottles and placed in an environment of 50°C and 60% humidity for 3 months. The presence of stratification, discoloration, precipitation, or flocculent matter was observed. Any products exhibiting these phenomena were considered unqualified. The cleaning effect of the swelling agent was then tested using the experimental method described in step 1). Note that if the swelling agent produced precipitation, the upper liquid layer should be collected to avoid clogging the nozzle during spraying. Finally, the residual adhesive rate was calculated. The contact residence time of the swelling agent was tested at 10 seconds.

[0055] The experimental data are shown in Table 2. Table 2. Experimental data of Examples 1-9 and Comparative Examples 1-4

[0056] Combining Example 2 and Comparative Examples 1-4 with Table 2, it can be seen that Comparative Examples 1-4 exhibited unqualified performance at both 5S and 10S quality temperatures. Furthermore, the residual glue rate of Comparative Examples 1-4 was significantly higher than that of Example 2, both in terms of stability and at different cleaning times. This indicates that using the raw material system of this application (petroleum ether as the main component, 120# solvent oil as an auxiliary component, and light paraffin oil as an adjuvant, to formulate a three-phase compound swelling agent, combined with a fatty alcohol polyoxyethylene ether-based activator and processing aids) further improves the cleaning effect and quality stability of the swelling agent in a swelling agent used to remove cured addition-type high-temperature vulcanized silicone rubber thin layers.

[0057] Combining Examples 2 and 4 with Table 2, it can be seen that the residual adhesive rate and stability residual adhesive rate obtained in Example 2 after 5 seconds are significantly better than those in Example 4, indicating that the stability and removal effect of Example 4 after the addition of the penetration-directing agent are better.

[0058] Compared with Examples 4-7, Examples 8-9 achieved Grade A in both residual glue rate and stability after 5 seconds, while Examples 4-7 only achieved Grade B. This indicates that the combination of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene can achieve better synergy and enhance the effects of other raw materials, further improving the quality stability and removal efficiency of the swelling agent.

[0059] This is merely an explanation of the present application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A solvent for removing swelling of cured addition-type high-temperature vulcanized silicone rubber thin layers, characterized in that, It is composed of the following raw materials by weight percentage: main solvent 50-90%; auxiliary solvent 13-60%; co-solvent 3-10%; activity accelerator 0.1-1%; the balance being processing aids; the activity accelerator is a fatty alcohol polyoxyethylene ether-based activator; the main solvent is petroleum ether; the auxiliary solvent is composed of 120# solvent oil and light paraffin oil; the co-solvent is an alcohol solvent; the total weight percentage of the main solvent, auxiliary solvent, co-solvent, activity accelerator, and processing aids equals 100%. The fatty alcohol polyoxyethylene ether-based surfactant is composed of a fatty alcohol polyoxyethylene ether-based compound and a penetration-directing agent; the penetration-directing agent is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-ended epoxy polyether silicone oil, and low molecular weight polyisobutylene in a weight ratio of 1:(0.2-0.4):(0.1-0.3). The low molecular weight polyisobutylene has a molecular weight of 500-1000.

2. The solvent for removing swelling of cured addition-type high-temperature vulcanized silicone rubber thin layers according to claim 1, characterized in that: The fatty alcohol polyoxyethylene ether-based activator is fatty alcohol polyoxyethylene ether AEO-3 and / or fatty alcohol polyoxyethylene ether AEO-7.

3. The swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers according to claim 1, characterized in that: The processing aid consists of benzotriazole and vanillin.

4. The swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers according to claim 3, characterized in that: The swelling agent contains 0.2 wt% benzotriazole and 0.3 wt% vanillin.

5. The swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers according to claim 1, characterized in that: In the swelling agent, the 120# solvent oil is 10-50 wt%; and the light paraffin oil is 3-10 wt%.

6. The swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers according to claim 1, characterized in that: The alcohol solvent is one or a combination of ethanol, butanol, and propanol.

7. A method for preparing a swelling agent for removing a cured addition-type high-temperature vulcanized silicone film according to any one of claims 1-6, characterized in that: The following steps were taken: Step 1: Add the activity promoter and processing aid to the co-solvent, stir thoroughly, let stand for 3 minutes, filter, and obtain mixed solution A; Step 2: Add mixed solution A to 120# solvent oil, mix evenly, and obtain mixed solution B; Step 3: Add light paraffin oil to the main solvent, mix evenly, and obtain mixed solution C; Step 4: Mix mixed solution B and mixed solution C evenly, store in the dark, and obtain the swelling agent.

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