Swelling agent for removing cured addition type high-temperature vulcanized silica gel thin layer and preparation method thereof

Abstract

The invention relates to the field of technical schemes, in particular to a swelling agent for removing a cured addition type high-temperature vulcanized silica gel thin layer and a preparation method of the swelling agent. The solvent comprises the following raw materials in percentage by weight: 50-90% of a main solvent; 13-60% of an auxiliary solvent; 3-10% of a cosolvent; 0.1-1% of an active promoter; the balance is a processing aid; the activity promoting material is an active agent containing fatty alcohol polyoxyethylene ether; the main solvent is petroleum ether; the auxiliary solvent is composed of 120 # solvent oil and light paraffin oil; the cosolvent is an alcohol solvent; the sum of the weight percentages of the main solvent, the auxiliary solvent, the cosolvent, the activity accelerant and the processing aid is equal to 100%, and the obtained swelling agent has better stability and has a better removal effect when being used for removing a cured addition type high-temperature vulcanized silica gel thin layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of technical solutions, more specifically, it relates to a kind of swelling agent for removing cured addition type high temperature vulcanized silicone thin layer and its preparation method. BACKGROUND

[0002] In electronics, optics, packaging and many other fields, protective film is widely used. Protective film plays an important role in improving product appearance, protecting product surface and improving product performance. With the continuous development of these fields, higher requirements are put forward for the quality, performance and use effect of protective film. In the production and manufacturing process of protective film, it is a key and common requirement to remove the thin layer of cured addition type high temperature vulcanized silicone coated on the protective film, which is crucial to ensure the quality, performance and subsequent use effect of the protective film.

[0003] At present, when dealing with the removal or swelling of cured silicone, there are some mixed solvents on the market for dissolving or swelling of cured silicone. From the aspect of applicable silicone type, most of the existing mixed solvents are only suitable for room temperature vulcanized condensation type silicone. Room temperature vulcanized condensation type silicone and high temperature vulcanized addition type silicone have significant differences in chemical structure and curing mechanism. When facing cured high temperature vulcanized addition type silicone, the removal and swelling effect of such solvents is minimal. From the perspective of solvent form, single-component solvents also have limited swelling effect on cured high temperature vulcanized addition type silicone. The composition of single-component solvents is relatively simple, and the interaction between them and high temperature vulcanized addition type silicone is relatively simple, making it difficult to effectively destroy the cured structure of silicone and penetrate deeply into the interior of silicone to achieve full swelling.

[0004] The existing formula solvent mainly focuses on the removal of condensation type room temperature vulcanized silicone, and its effect on cured addition type high temperature vulcanized silicone is extremely limited. In actual application, especially in the production of protective film, the existing combined solution has extremely low efficiency in removing the thin layer of cured addition type high temperature vulcanized silicone on the protective film. Operators need to spend a lot of time and effort to repeatedly process in order to achieve a certain degree of removal. Moreover, the existing solution is difficult to completely remove the silicone, and the residual silicone may affect the adhesion, optical performance and other properties of the protective film and other components. More seriously, the existing solution can easily damage the protective film substrate during the removal process, causing discoloration, deformation, strength reduction and other problems of the substrate. SUMMARY

[0005] The present application aims to overcome the above technical problems and provides a kind of swelling agent for removing cured addition type high temperature vulcanized silicone thin layer and its preparation method.

[0006] In a first aspect, a swelling agent for removing a cured addition type high temperature vulcanized silicone thin layer is composed of the following raw materials in weight percentage: 50-90% of a main solvent; 13-60% of an auxiliary solvent; 3-10% of a cosolvent; 0.1-1% of an activity promoter; the balance of a processing aid; the activity promoter is a fatty alcohol polyoxyethylene ether-based active agent; the main solvent is petroleum ether; the auxiliary solvent is composed of 120# solvent oil and light paraffin oil; the cosolvent is an alcohol solvent; and the sum of the weight percentages of the main solvent, auxiliary solvent, cosolvent, activity promoter and processing aid is equal to 100%.

[0007] By adopting the above technical solution, petroleum ether is used as the main solvent, 120# solvent oil is used as the auxiliary solvent, and light paraffin oil is used as the cosolvent to prepare a three-phase compounded swelling agent. The main component of petroleum ether is C5 and C6 aliphatic hydrocarbon, the main component of 120# solvent oil is C6 and C7 aliphatic hydrocarbon, and the main component of light paraffin oil is C10-C12 aliphatic hydrocarbon. These three components are all non-polar solvents mainly composed of aliphatic hydrocarbons and can be completely miscible with each other, thereby forming a mixed solution system covering a continuous component range of C5-C12 aliphatic hydrocarbons. The components in the system can synergize with each other to effectively swell the cured addition type high temperature vulcanized silicone thin layer and exhibit excellent dissolving and penetrating ability, which can significantly improve the treatment effect on the cured silicone thin layer.

[0008] The light paraffin oil (mainly composed of C10-C12 aliphatic hydrocarbon) can effectively delay the volatilization rate of other solvents in the mixed solution due to its large molecular weight. At the same time, its low surface tension characteristics can fully infiltrate the cured addition type high temperature vulcanized silicone thin layer, significantly improve the infiltration and penetration efficiency of the system on the silicone thin layer, and thus accelerate the silicone swelling process, thereby creating favorable conditions for subsequent rapid removal of the silicone. In addition, the volatilization speed of the whole system can be flexibly adjusted by the addition ratio of the light paraffin oil in the present application to adapt to different application scenarios. After the introduction of the cosolvent in the system, not only can the polarity of the mixed solution be adjusted to enhance the swelling ability of the main solvent on the silicone (i.e., to play a cosolvent effect), but also a small amount of polar substances that may exist in the system can be dissolved at the same time, further optimizing the stability and cleaning effect of the solution.

[0009] The fatty alcohol polyoxyethylene ether-based active agent can significantly reduce the surface tension of the three-phase mixed solution (petroleum ether, 120# solvent oil, light liquid paraffin oil), further enhance the spreading, wetting and penetration ability of the system to the cured addition type high temperature vulcanized silicone rubber thin layer. The active agent and the raw materials such as light liquid paraffin oil synergistically act to form a thermodynamically stable swelling agent system, effectively inhibiting the delamination, too fast evaporation and other unstable phenomena of the swelling agent during storage and use, prolonging the shelf life and ensuring the use consistency. At the same time, during the cleaning process, the stable system can realize the rapid and efficient stripping and removal of the silicone rubber thin layer, and can maximize the protection of the surface integrity of the substrate, greatly improving the overall quality and reliability of the cleaning process.

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

[0011] By adopting the above technical solution, the fatty alcohol polyoxyethylene ether AEO-3 as the fatty alcohol polyoxyethylene ether-based active agent can reduce the surface tension of the mixed solution, play a spreading, wetting and penetration role, enhance the swelling ability of the swelling agent to the silicone rubber thin layer, and improve the removal efficiency, thereby improving the cleaning effect. At the same time, the fatty alcohol polyoxyethylene ether AEO-3 has good chemical stability and will not decompose or deteriorate, can also synergistically maintain the uniform physical state of the swelling agent with other components of the swelling agent, is not prone to delamination or precipitation, and has a certain temperature adaptability, further improving the stability of the swelling agent during use or storage, and improving its practicability.

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

[0013] By adopting the above technical solution, the fatty alcohol polyoxyethylene ether-based active agent is composed of a fatty alcohol polyoxyethylene ether-based compound and a penetration directing agent (a combination of one or more of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-end epoxy polyether silicone oil, and low molecular weight polyisobutylene), which can significantly improve the cleaning effect of the swelling agent on the silicone rubber thin layer.

[0014] In terms of cleaning effect, the fatty alcohol polyoxyethylene ether-based compound and the penetration directing agent synergize to enhance the swelling capacity of the swelling agent on the silica gel thin layer, promote the decomposition of the silica gel thin layer, and reduce the surface tension to guide the swelling agent to penetrate along the most effective direction, so that the swelling agent can more efficiently penetrate into the silica gel thin layer, avoid local insufficient or excessive penetration, and optimize the wettability of the swelling agent to more uniformly cover the surface of the silica gel thin layer, thereby improving the penetration capacity and quickly, deeply and completely removing the silica gel.

[0015] In terms of stability, both have good chemical stability and do not decompose or deteriorate, and can maintain the uniform physical state of the swelling agent, are not prone to stratification or precipitation, have certain temperature adaptability, ensure the stability of the swelling agent during use or storage, and improve the practicability of the swelling agent.

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

[0017] By adopting the above technical solution, petroleum ether is used as the main solvent, 120# solvent oil and light paraffin oil are used as auxiliary solvents, an alcohol solvent is used as a cosolvent, a fatty alcohol polyoxyethylene ether-based active agent is used as an activity promoting material, and benzotriazole and / or vanillin are used as processing aids, which can form a three-phase compounded swelling agent, and the swelling agent can synergistically swell the cured addition-type high-temperature vulcanized silica gel thin layer.

[0018] When the fatty alcohol polyoxyethylene ether-based active agent is composed of a fatty alcohol polyoxyethylene ether-based compound and a penetration directing agent, the contradiction between the storage stability, use controllability, and efficient and residue-free removal of the swelling agent product is effectively balanced, thereby achieving precise, deep and complete removal of the cured silica gel.

[0019] Further, the penetration directing agent is a compounded system composed of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-end epoxy polyether silicone oil, and low molecular weight polyisobutylene at a weight ratio of 1:(0.1-0.5):(0.1-0.3). This specific ratio produces a significant multi-dimensional synergistic effect: In terms of penetration and removal, based on the multi-stage synergistic mechanism of "physical wedging-interface wetting-chemical anchoring", the system can quickly, deeply and non-destructively swell and remove the dense cross-linked silica gel network.

[0020] In terms of system stability, the three-stable mechanism of "component compatibility-structure support-density adjustment" ensures the performance consistency of the product during storage and use. Specifically, the low molecular weight polyisobutylene forms a network of coating in the system by its viscosity and film-forming property, effectively limiting the movement and aggregation of molecules of each component; it cooperates with the other two components to build a stable swelling environment, thus ensuring the continuity and effectiveness of the permeation-oriented function.

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

[0022] By adopting the above technical solution, the swelling agent is composed of petroleum ether as the main solvent, 120# solvent oil and light paraffin oil as auxiliary solvents, alcohol solvent as a cosolvent, fatty alcohol polyoxyethylene ether-based active agent as an active promoting material, benzotriazole and / or vanillin as a processing aid, which can mutually coordinate the swelling of the cured addition-type high-temperature vulcanized silicone 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 spreading and penetrating role, reduce the damage to the metal substrate, harmonize the smell of the mixed solution, add a faint sweet smell, and play an antioxidant role; the fatty alcohol polyoxyethylene ether-based active agent is composed of a fatty alcohol polyoxyethylene ether-based compound and a permeation-oriented agent, which can solve the contradictions of storage stability, controllability and high efficiency of removal, and no residual glue of the swelling agent product, and realize precise, deep and complete removal of the cured silicone; the polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-end epoxy polyether silicone oil, and low molecular weight polyisobutylene are compounded according to a specific weight ratio to build a multi-dimensional synergistic penetration promoting effect, realizing rapid, deep and non-destructive swelling removal of the dense cross-linked silicone network; the low molecular weight polyisobutylene has a molecular weight of 500-1000, which can better play its role in the swelling agent, such as expanding the intermolecular gap of the silicone by physical action, cooperating with other ingredients to build a stable swelling environment, etc. While improving the removal capacity of the swelling agent, the stability of the swelling agent during storage and use is further improved.

[0023] Preferably, the processing aid is composed 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, and play a metal corrosion inhibition role; vanillin can harmonize the smell of the mixed solution and add a faint sweet smell, and the phenolic hydroxyl group plays an antioxidant role, which has a synergistic effect with the permeation-oriented agent and benzotriazole, ensuring that the metal surface is not affected during use, and ensuring the stability of the entire swelling agent during storage and use.

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

[0026] By adopting the technical scheme, the swelling agent is composed of a main solvent, an auxiliary solvent, a cosolvent, an activity promoter and a processing aid. The main solvent is petroleum ether, the auxiliary solvent is composed of 120# solvent oil and light paraffin oil, the cosolvent is an alcohol solvent, and the activity promoter is a fatty alcohol polyoxyethylene ether-based active agent. The swelling agent can swell the cured addition-type high-temperature vulcanized silicone thin layer in coordination with each other. The light paraffin oil can prevent the solvent from rapidly evaporating, infiltrating and penetrating the silicone rubber surface, and adjust the evaporation speed of the mixed solution. The cosolvent can adjust the polarity of the mixed solution and dissolve a small amount of polar substances. The activity promoter can reduce the surface tension of the mixed solution and play a role in infiltration and penetration. On this basis, benzotriazole and vanillin are used as the processing aid. The benzotriazole can reduce the damage to the metal substrate, and the vanillin can adjust the odor of the mixed solution and increase the sweet fragrance. The phenolic hydroxyl group of the vanillin can play an antioxidant role, has a synergistic effect with other components, and ensures the stability of the swelling agent during use and storage. Further, the benzotriazole accounts for 0.2 wt% and the vanillin accounts for 0.3 wt% in the swelling agent. The swelling agent can ensure the stability of the entire swelling agent during use and storage while not affecting the metal surface during use.

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

[0028] By adopting the technical scheme, petroleum ether is used as the main solvent, and 120# solvent oil and light paraffin oil are used as the auxiliary solvent to form a three-phase compound swelling agent, which can swell the cured addition-type high-temperature vulcanized silicone thin layer in coordination with each other. The light paraffin oil can prevent the solvent from rapidly evaporating, has low surface tension and can infiltrate the silicone rubber surface, realize infiltration and penetration, facilitate rapid removal of the silicone thin layer, and adjust the evaporation speed of the mixed solution by adjusting the proportion. At the same time, the 120# solvent oil and the light paraffin oil are mixed according to the above proportion, so that the swelling agent can better swell and remove the cured addition-type high-temperature vulcanized silicone thin layer.

[0029] Preferably, the alcohol solvent is one or a combination of multiple kinds 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. The three compounds of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-end epoxy polyether silicone oil, low molecular weight polyisobutylene can realize multi-dimensional synergistic penetration promotion, and build system stability function; 6. The addition of benzotriazole can reduce the damage to the metal substrate, and vanillin can adjust the odor of the mixed solution and increase the sweet fragrance. The phenolic hydroxyl group plays an antioxidant role and has a synergistic effect with other ingredients to ensure the stability of the swelling agent during storage. DETAILED DESCRIPTION

[0034] The application will be further described in detail below in combination with examples.

[0035] Part of the raw material source: 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-segment copolymer, and its molecular structure is as follows: n and m are both 1-10, and the relative molecular weight is 500-2000;

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

[0037] Example 1 A swelling agent for removing a cured addition type high temperature vulcanized silicone rubber thin layer is obtained by the method; Step 1: According to the weight percentage, 0.1% active promoter and 0.9% processing aid are added to 3% cosolvent, the stirring time is 3 min, the stirring rate is 100 r / min, and they are fully stirred and uniformly placed for 3 min, and then filtered with a 500 mesh filter to obtain a mixed solution A; Step 2: According to the weight percentage, all the mixed solution A is added to 40% of 120# solvent oil, the stirring time is 3 min, the stirring rate is 100 r / min, and they are fully mixed and uniformly, to obtain a mixed solution B; Step 3: According to the weight percentage, 6% light paraffin oil is added to 50% main solvent, the stirring time is 3 min, the stirring rate is 100 r / min, and they are fully mixed and uniformly, to obtain a mixed solution C; Step 4: Mix all mixed solution B and all mixed solution C with stirring, stirring time 3 min, stirring speed 100 r / min, so that it is fully mixed and uniform, put into a brown glass bottle, store in the dark, to get the swollen solution.

[0038] The processing aid is composed of benzotriazole and vanillin with a weight ratio of 0.6:0.3; the main solvent is petroleum ether; the auxiliary solvent is composed of 120# solvent oil and light paraffin oil; the cosolvent is an alcohol solvent; the sum of the weight percentages of the main solvent, the auxiliary solvent, the cosolvent, the active promoter, and the processing aid is equal to 100%; the alcohol solvent is ethanol. The amounts of raw materials are shown in Table 1. The fatty alcohol polyoxyethylene ether-based active agent is composed of fatty alcohol polyoxyethylene ether AEO-3 and fatty alcohol polyoxyethylene ether AEO-7 with a weight ratio of 3:1.

[0039] Example 2-3 Example 2-3 differs from Example 1 in that the amounts of raw materials are different, as shown in Table 1. Table 1 Amounts of raw materials in Examples 1-3 Example

[0040] Example 4 differs from Example 2 in that the fatty alcohol polyoxyethylene ether-based active agent is composed of a fatty alcohol polyoxyethylene ether-based compound and a penetration directing agent with a weight ratio of 1:1, and the fatty alcohol polyoxyethylene ether-based compound is composed of fatty alcohol polyoxyethylene ether AEO-3 and fatty alcohol polyoxyethylene ether AEO-7 with a weight ratio of 3:1; the penetration directing agent is polyethylene oxide-polypropylene oxide-polyethylene oxide.

[0041] Example 5 Example 5 differs from Example 4 in that the penetration directing agent is a hydrophilic double-end epoxy polyether silicone oil.

[0042] Example 6 Example 6 differs from Example 4 in that the penetration directing agent is a low molecular weight polyisobutylene.

[0043] Example 7 Example 7 differs from Example 4 in that the penetration directing agent is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide and a hydrophilic double-end epoxy polyether silicone oil with a weight ratio of 3:1.

[0044] Example 8 Example 8 differs from Example 4 in that the penetration directing agent is composed of polyethylene oxide-polypropylene oxide-polyethylene oxide, a hydrophilic double-end epoxy polyether silicone oil, and a low molecular weight polyisobutylene with a weight ratio of 1:0.2:0.3.

[0045] Example 9 Example 9 is the same as Example 4 except that the penetration directing agent is a weight ratio of polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-end epoxy polyether silicone oil, low molecular weight polyisobutylene is 1:0.4:0.1.

[0046] Comparative Example Comparative Example 1 Comparative Example 1 is different from Example 2 in that the active promoting agent is replaced by the main solvent.

[0047] Comparative Example 2 Comparative Example 2 is different from Example 2 in that the active promoting agent is replaced by other surfactants (such as NP-10, HLB is 12-13).

[0048] Comparative Example 3 Comparative Example 3 is different from Example 2 in that the light paraffin oil is replaced by 120# solvent oil.

[0049] Comparative Example 4 Comparative Example 4 is different from Example 2 in that the 120# solvent oil is replaced by the main solvent.

[0050] Experimental test The swelling agents obtained in Examples 1-9 and Comparative Examples 1-4 are used for the following experimental tests.

[0051] 1) Removal effect Removal object: a thin layer of addition type high temperature vulcanized silicone rubber with a thickness of 0.1 mm on an aluminum plate; Contact residence time of the swelling agent: 5s, 10s; Thin layer of addition type high temperature vulcanized silicone rubber: an organic silicon material vulcanized based on the hydrogen silazation reaction of vinyl and silicon hydrogen groups; Removal blade: a plastic sheet made of polytetrafluoroethylene with a thickness of 1 mm, the edge in contact with the thin layer of silicone rubber is arranged in an arc shape, and the diameter of the arc shape is 1 mm; Specific operation: first, fix the thin layer of addition type high temperature vulcanized silicone rubber with a thickness of 0.1 mm on the aluminum plate on the experimental table, then spray or drop the swelling agent obtained in Examples 1-9 and Comparative Examples 1-4 on the surface of the thin layer of addition type high temperature vulcanized silicone rubber with a thickness of 0.1 mm on the aluminum plate, so that it is fully in contact with the surface, the amount of swelling agent is 50g / m 2 ; then drive the plastic sheet made of polytetrafluoroethylene to remove all the thin layer of silicone rubber on the aluminum plate (the plastic sheet and the surface of the aluminum plate form a 45° angle), the scraping force is 0.5N, the scraping rate is 100mm / min, the scraping frequency is one way, and the contact residence time of the swelling agent is tested respectively: 5s, 10s; to obtain a scraping sample plate; The blade sample is observed directly through a 70 times magnifying lens and verified by infrared detection technology; based on the observation and detection results, the actual coverage area of the residual silica gel thin layer is counted, and then the residual glue rate is calculated by the following formula: Residual glue rate (%) = (actual coverage area of residual silica gel thin layer / original silica gel thin layer coverage area) x 100%.

[0052] Residual glue rate level: A: A < 0.001%; B: 0.001% ≦ B < 0.01%; C: 0.01% ≦ C < 0.1%; D: 0.1% ≦ B < 1%; E: E ≧ 1%.

[0053] 2) Quality stability The swelling agent obtained in Examples 1-9 and Comparative Examples 1-4 is sealed in a brown glass bottle and placed in an environment with a temperature of 50°C and a humidity of 60% for 3 months. The presence of delamination, discoloration, precipitation or flocculation is observed. If any of the above phenomena occurs, it is recorded as unqualified. Then, the removal effect of the swelling agent is detected by the experimental method in 1), and when the swelling agent produces precipitates, the upper liquid is taken to avoid blocking the spray head during spraying. Finally, the residual glue rate is calculated. The contact residence time of the swelling agent is 10s.

[0054] The above experimental data are shown in Table 2. Table 2 Experimental data of Examples 1-9 and Comparative Examples 1-4

[0055] It can be seen from Examples 2 and Comparative Examples 1-4 and Table 2 that Comparative Examples 1-4 can all appear unqualified at 5s and 10s quality time, and the residual glue rate level of Comparative Examples 1-4 is significantly higher than that of Example 2 in terms of stability and different cleaning times, indicating that the use of the raw material system of the present application (petroleum ether as the main component, 120# solvent oil as the auxiliary component, and light paraffin oil as the auxiliary component, to prepare a three-phase complex swelling agent, combined with a fatty alcohol polyoxyethylene ether-based active agent and a processing aid) further improves the removal effect and quality stability of the swelling agent for removing the solidified addition type high temperature vulcanized silica gel thin layer.

[0056] It can be seen from Examples 2 and 4 and Table 2 that the residual glue rate level and stability of Example 2 at 5s are significantly better than those of Example 4, indicating that the stability and removal effect of Example 4 are improved after adding the penetration directing agent.

[0057] Compared with examples 4-7, the 5s of examples 8-9 reach A level in terms of the residual glue rate and the stability of the residual glue, and examples 4-7 only reach B level, which shows that when polyethylene oxide-polypropylene oxide-polyethylene oxide, hydrophilic double-end epoxy polyether silicone oil and low molecular weight polyisobutylene are compounded, better synergy can be achieved, and other raw materials can play a synergistic effect, further improving the quality stability and removal efficiency of the swelling agent.

[0058] This is only an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the present embodiment without creative contribution after reading the present specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A solvent for removing swelling of cured addition-type high-temperature vulcanized silicone rubber thin layers, characterized in that, It consists of 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%.

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 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.

4. The swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers according to claim 3, characterized in that: 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).

5. The swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers according to claim 3, characterized in that: The low molecular weight polyisobutylene has a molecular weight of 500-1000.

6. 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.

7. The swelling agent for removing cured addition-type high-temperature vulcanized silicone rubber thin layers according to claim 6, characterized in that: The swelling agent contains 0.2 wt% benzotriazole and 0.3 wt% vanillin.

8. 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%.

9. 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.

10. A method for preparing a swelling agent for removing a cured addition-type high-temperature vulcanized silicone film according to any one of claims 1-9, characterized in that: 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 solvent oil No. 120 and mix well to obtain mixed solution B; Step 3: Add the light paraffin oil to the main solvent and mix well to obtain mixed solution C; Step 4: Mix solution B and solution C thoroughly, store in the dark, and obtain the swelling agent.

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