Composition for protective film and production method therefor

Abstract

To prevent the electrolysis efficiency from decreasing resulting from the damage and peeling-off of the catalyst layer in a solution environment when a titanium electrode coated with a catalyst layer to enhance the electrolysis efficiency is used in a strong acid solution including hydrogen peroxide solution, and to prevent the cost of the titanium electrode from increasing when the protective layer protecting the catalyst layer is formed of a metallic film, whereby the electrode fabrication process becomes complicated.SOLUTION: The composition for a protective film, including a silicone oligomer, a silicone resin, and a silicone compound containing an epoxy group, with the silicone resin contained therein in a range of more than 10 weight parts and less than 300 weight parts relative to 100 weight parts of the silicone oligomer, and the silicone compound containing an epoxy group contained therein in a range of more than 10 weight parts and less than 200 weight parts relative to the total of 100 weight parts of the silicone oligomer and the silicone resin, can protect the catalyst layer of the electrode from a severe environment in the treatment solution, and can extend the life of the electrode.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a composition for forming a protective film that protects electrodes used in electrolysis, which is widely used in industrial applications such as plating and recovering metals present in a solution to be treated. [Background technology]

[0002] Electrolysis is used in a variety of industrial fields. The electrodes used in this process have a current of several A / dm 2 to several hundred A / dm 2 They are used over a wide range of current densities, from 0.1 to over 0.25. Among these, anodes in particular require high oxidation resistance because oxidation reactions, such as the generation of oxygen and chlorine gas, occur on their surfaces, and they also require electrode durability. Furthermore, titanium and its alloys are used as electrode substrates as valve metals for electrodes from environmental and safety perspectives. However, although titanium is electrically conductive, its conductivity is not particularly high. Therefore, when titanium is used as an electrode, a stable catalyst layer, such as a platinum-based metal, is provided on its surface.

[0003] In industrial electrolysis, in addition to the use at high current densities as described above, there are also cases where the liquid to be treated is a strong acid, or where it is used in a strong oxidizing environment with the addition of hydrogen peroxide. In particular, if a catalyst layer is formed on the surface of the electrode material to increase the efficiency of electrolysis, the catalyst layer will be damaged.

[0004] Patent Document 1 discloses an electrode including a valve metal substrate such as titanium, an outer catalyst layer, and a protective layer made of a valve metal oxide interposed between the substrate and the catalyst layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5932028 Summary of the Invention [Problem to be solved by the invention]

[0006] Using metal as a protective layer for the catalyst layer on the electrode is thought to have a high protective ability for the electrode, but manufacturing it requires complex processes, such as heat treatment at high temperatures of nearly 500°C, which increases the cost. There was a demand for a cheaper protective layer that could protect the electrode (especially the catalyst layer) even in harsh environments. [Means for solving the problem]

[0007] The present disclosure has been conceived in view of the above-mentioned problems, and provides a protective film composition capable of protecting materials to be protected, such as electrodes used in harsh environments, and a method for producing the same.

[0008] Specifically, the composition for overcoat film according to the present disclosure is a silicone oligomer; Silicone resin and containing a silicone compound containing an epoxy group, The silicone resin is contained in an amount of more than 10 parts by weight and less than 300 parts by weight per 100 parts by weight of the silicone oligomer, The silicone compound containing an epoxy group is contained in an amount of more than 10 parts by weight and less than 200 parts by weight per 100 parts by weight of the total of the silicone oligomer and the silicone resin.

[0009] Specifically, the method for producing the overcoat film composition according to the present disclosure includes the steps of: a step of mixing a silicone oligomer, a silicone resin, an epoxy group-containing silicone compound, and a solvent to obtain a mixture; a step of dispersing the mixture to obtain a composition for an overcoat film, In the mixture, The silicone resin is More than 10 parts by weight per 100 parts by weight of the silicone oligomer, The range is less than 300 parts by weight, The silicone compound containing an epoxy group is 100 parts by weight of the total of the silicone oligomer and the silicone resin The range is more than 10 parts by weight and less than 200 parts by weight, The solvent is contained in an amount ranging from 130 to 230 parts by weight per 100 parts by weight of the total weight of the solid content. [Effects of the Invention]

[0010] The protective film composition of the present disclosure forms a resin film primarily composed of silicone, and therefore can firmly bond to the catalyst layer on the electrode surface to be protected, even in harsh solution environments such as those containing strong acids or hydrogen peroxide, thereby protecting the entire electrode. Furthermore, the protective film composition of the present disclosure is inexpensive and very easy to form a protective film, so that rather than forming a solid metal protective film through a complicated procedure, the protective film can be simply reapplied each time it is peeled off, thereby extending the useful life of the electrode. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an experimental setup for examining the performance of a composition for an overcoat film. [Figure 2] (a) Photograph of the surface of an electrode with a catalyst layer formed, (b) Photograph of the surface of an electrode with a protective film formed on the catalyst layer, (c) Photograph showing the state in which half of the protective film has peeled off due to use. DETAILED DESCRIPTION OF THE INVENTION

[0012] The overcoat film composition according to the present disclosure will be described below with reference to drawings and examples. Note that the following description illustrates one embodiment and one example of the present disclosure, and the present disclosure is not limited to the following description. The following description can be modified without departing from the spirit of the present disclosure. In addition, in the following description, "~" indicating a range of component composition means "at least or equal to" or "below." In other words, "A% to B%" means "at least A% and at most B%."

[0013] The overcoat film composition according to the present disclosure contains silicone. More specifically, it contains a silicone oligomer, a silicone resin, and a silicone compound containing an epoxy group. It may further contain conductive particles and a solvent.

[0014] Silicone oligomers are also called alkoxy-containing organopolysiloxanes in which organic groups are bonded to a main skeleton formed by siloxane bonds, and refer to those with a weight-average molecular weight of 1,000 or more and 10,000 or less. In the present disclosure, the organic groups preferably used are those to which methyl groups, phenyl groups, ethoxy groups, methoxy groups, epoxy groups, mercapto groups, amino groups, methacryloyl groups, acryloyl groups, etc. are bonded.

[0015] Specifically, X-41-1053, X-41-1059A (each having an epoxy group, a methoxy group, or an ethoxy group), X-41-1056 (having an epoxy group and a methoxy group), X-41-1805 (having a mercapto group, a methoxy group, or an ethoxy group), X-41-1818 (having a mercapto group and an ethoxy group), X-41-1810 (having a mercapto group and a methoxy group), X-41-2651 (having an amino group and a methoxy group), and X-40-2655 manufactured by Shin-Etsu Chemical Co., Ltd. Alkoxy oligomers such as KR-513 (containing acryloyl and methoxy groups), KC-89S, KR-500, X-40-9225, X-40-9246, X-40-9250, KR-401N, X-40-9227, X-40-9247, KR-510, KR-9218, KR-213, and X-40-2308 (containing methoxy groups), as well as X-40-9238 (containing ethoxy groups), can be suitably used.

[0016] The epoxy group-containing silicone compound (hereinafter simply referred to as "epoxy") can be one having a siloxane skeleton or an Si-O bond and an epoxy group. Specifically, a silane coupling agent (3-glycidoxypropyltrimethoxysilane: CAS number 2530-83-8) or the like can be suitably used.

[0017] Furthermore, it is desirable for the epoxy group-containing silicone compound to have multiple epoxy groups, as this allows for the formation of stronger bonds with the catalyst layer. Specific examples include KR-516, KR-517, and X-24-9590 manufactured by Shin-Etsu Chemical Co., Ltd.

[0018] Furthermore, the epoxy group-containing silicone compound may be one that does not have an alkoxy group, as long as it has an Si-O structure and an epoxy group in the molecule. Specific examples include X-40-2678, X-40-2669, X-40-2728, and KR-470 manufactured by Shin-Etsu Chemical Co., Ltd.

[0019] Silicone resin has a siloxane skeleton and a weight-average molecular weight of tens of thousands to millions.

[0020] Specifically, suitable methylphenyl silicone resins include KR255, KR311, KR300, and KR510 manufactured by Shin-Etsu Chemical Co., Ltd. Methylsilicone resins include KR251, KR400, KR220L, KR242A, KR240, KR500, and KC89 manufactured by Shin-Etsu Chemical Co., Ltd. SR2400 and Trefil R910 manufactured by Toray Dow Corning Co., Ltd. Silicone resins containing 60 mol% or more of trifunctional T units may also be used. Among these, silicone resins in which 50 mol% or more of the functional groups on the silicon are methyl groups are particularly suitable. It is desirable for at least one of the silicone oligomer and silicone resin to contain a phenyl group. The presence of a phenyl group slightly softens the resin's hardness, preventing film cracking and peeling.

[0021] The protective film composition according to the present disclosure does not need to contain conductive particles, but if conductive particles are contained, the effect of lowering the inter-terminal voltage when constant current control is performed can be obtained. Therefore, the protective film composition may contain conductive particles. As the conductive particles, conductive carbon-based particles such as conductive carbon black and carbon nanotubes can be suitably used.

[0022] <Composition ratio> The silicone oligomer, silicone resin, epoxy, and conductive particles can be used in the following ranges: When the total solid weight of the silicone oligomer is 100 parts by weight, the silicone resin is more than 10 parts by weight and less than 300 parts by weight, more preferably 20 to 250 parts by weight, and most preferably 30 to 200 parts by weight. If the silicone resin is too little, film-forming properties are poor and the film does not have sufficient strength. On the other hand, if the resin is too much, the film becomes brittle.

[0023] Furthermore, the epoxy content is more than 10 parts by weight and less than 200 parts by weight, based on 100 parts by weight of the total solids content of the silicone oligomer and silicone resin. It is more preferably 20 to 180 parts by weight, and most preferably 30 to 150 parts by weight. The total solids content of the epoxy does not include the weight of the epoxy curing catalyst, as the amount of curing catalyst used is small. If the epoxy content is too low, adhesion cannot be ensured, while if it is too high, the organic groups will be too numerous, weakening the film overall and weakening the three-dimensional Si-O-Si network, making it impossible to ensure sufficient film strength and chemical resistance.

[0024] The amount of conductive particles is 0 to 15 parts by weight, more preferably 2 to 15 parts by weight, and most preferably 4 to 15 parts by weight, based on 100 parts by weight of the total solids of the silicone oligomer, silicone resin, and epoxy. The solvent may be an aromatic hydrocarbon solvent such as toluene or xylene, a carboxylic acid ester solvent such as ethyl acetate or butyl acetate, or a ketone solvent such as methyl ethyl ketone or methyl isobutyl ketone. The solvent may be selected so that the viscosity of the overcoat film composition is easy to handle for application. The addition of conductive particles can reduce resistance during electrolysis. In other words, the voltage can be reduced in the case of constant current control. On the other hand, adding too many conductive particles can make the film brittle.

[0025] The protective film composition is prepared by mixing and dispersing the above materials, and then applying it to a conductive substrate so that the film thickness after drying will be 1 μm to 100 μm. After drying, the conductive substrate with the protective film is cured at 100°C to 250°C for 30 minutes to 3 hours to form a protective film. [Example]

[0026] An example in which a protective film 34 was formed on a catalyst layer 32 on a conductive substrate 30 using a protective film composition according to the present disclosure is shown below. FIG. 1 shows a schematic diagram of the experimental apparatus for this example. Referring to FIG. 1, a liquid to be treated 12 was placed in a container 10, and an anode 14 and a cathode 16 were fixed in a state in which they were partially immersed in the liquid to be treated 12. A constant current power supply 18 was placed between the anode 14 and the cathode 16, and an ammeter 20 and a voltmeter 22 were also placed therebetween.

[0027] The conductive substrate 30 on which the anode 14 is formed is a plate (20 mm x 100 mm x 2 mm) made of pure titanium (equivalent to JIS H4600-2). An alcohol solution containing dissolved platinum salt was sprayed onto both sides of the conductive substrate 30, and the catalyst layer 32 was formed by baking at 200°C. The platinum catalyst layer 32 was formed to a thickness of 2 μm. The conductive substrate 30 on which the catalyst layer 32 is formed is hereinafter referred to as the "catalyzed substrate."

[0028] A protective film composition (paint) prepared according to the following blending ratio was sprayed onto this catalyst-coated substrate to form a protective film 34 over the entire surface. The thickness of the protective film 34 was 10 μm after drying. After drying, it was cured at 200°C for 1 hour. The catalyst-coated substrate on which the protective film 34 was formed is referred to as a "catalyst substrate with protective film."

[0029] As the liquid to be treated 12, a test simulated liquid to be treated 12 containing 10% sulfuric acid and 4% hydrogen peroxide (by weight ratio) was prepared.

[0030] A catalyst substrate with a protective film was immersed as the anode 14 and a titanium plate material was immersed as the cathode 16 in the test simulated liquid 12, and the electrodes were fixed with a distance L between the opposing surfaces of 30 mm. Each electrode was connected to a constant current power source 18, and a current density of 30 A / dm 2The voltage was set to be constant and constant current control was performed.

[0031] The durability was evaluated as follows. (1) Every 0.5 hours, stop the electrolysis, remove the electrodes, and air-dry them. (2) Visual inspection and microscopic comparison of the condition before and after the test were performed. (3) If there is no change from the state after application, it is considered OK, and the test is continued. The time when the protective film peels off (NG) is the durability time of that protective film. Protective film peeling includes not only when the protective film is peeled off with the naked eye, but also when the thickness of the protective film is reduced to the point where about half of the underlying catalyst layer is visible.

[0032] Figure 2 shows a surface photograph. This was taken at 400x magnification using a shape-measuring laser microscope (Keyence Corporation VK-X1100). Figure 2(a) is a surface photograph of a substrate with a catalyst. Fine powder resembling black charcoal is observed on the titanium substrate. Figure 2(b) shows the state of the catalyst substrate with a protective film. The catalyst surface is completely covered with a protective film. Figure 2(c) is a surface photograph of the catalyst substrate with a protective film after a durability test that resulted in an NG. Approximately half of the black underlying catalyst layer is exposed. This was visually evaluated. In this disclosure, constant current control was performed, and the durability time was defined as the time until the inter-electrode voltage became more than twice that of the initial state.

[0033] <Composition> Two types of silicone oligomers were prepared: KR500 and KR510 (manufactured by Shin-Etsu Chemical Co., Ltd.). KR500 has a weight-average molecular weight of approximately 3,000 to 10,000 and contains methoxy groups in the skeleton. KR510 has a weight-average molecular weight of approximately 3,000 and contains methoxy groups in the skeleton.

[0034] Two types of silicone resins were prepared: KR251 and KR311 (manufactured by Shin-Etsu Chemical Co., Ltd.). KR251 has a weight-average molecular weight of 3,000,000 to 4,000,000. KR311 has a weight-average molecular weight of approximately 30,000.

[0035] The epoxy used was KBM403 (manufactured by Shin-Etsu Chemical Co., Ltd.), KR516 (manufactured by Shin-Etsu Chemical Co., Ltd.), and X-40-2669 (manufactured by Shin-Etsu Chemical Co., Ltd.). The conductive carbon used was 9538BLACK (manufactured by Tokushiki Corporation). Some raw materials already contain a solvent, but they may be diluted with a solvent such as ethyl acetate to achieve a viscosity that makes them easy to apply to electrodes. In this disclosure, the amount of solvent was 130 to 230 parts by weight per 100 parts by weight of the total solids weight of the overcoat film composition. Furthermore, D20 (manufactured by Shin-Etsu Chemical Co., Ltd.) was added as a silicone curing catalyst.

[0036] The raw materials, silicone oligomer, silicone resin, epoxy, curing catalyst, and optional additive conductive carbon, were mixed with a solvent to form a mixture. The mixture was then thoroughly stirred and dispersed using a disperser. The dispersed paste was used as the overcoat film composition paint. The overcoat film composition paint was then applied and dried to form the overcoat film composition.

[0037] As comparative resins, an acrylic resin (52-668BA: manufactured by DIC Corporation) and a melamine resin (L-145-60: manufactured by DIC Corporation) were prepared.

[0038] The compositions and evaluation results of the example samples (protective film coatings) are shown in Tables 1 and 2. The compositions and evaluation results of the comparative example samples (protective film coatings) are shown in Table 3.

[0039] [Table 1]

[0040] [Table 2]

[0041] [Table 3]

[0042] In Table 1, "◆Formulation (g)", "◆Formulation (relative display)", and "◆Evaluation" are shown. "◆Formulation (g)" indicates the actual weighed weight. The solid content of each material is shown in "%". "◆Formulation (relative display)" is calculated by taking the total weight of the solid content of the oligomer as 100 (the weight of the oligomer). * ), resin * indicates the weight ratio (%) of the oligomer to the total solid content. * indicates the weight ratio (%) of the total weight of the solid content of the oligomer and resin. * The calculation does not include the curing catalyst. * indicates the weight ratio (%) of all solvents (ethyl acetate and other solvents) added to the total solid content of the materials used. In addition, since Comparative Example 5 does not contain silicone oligomer or silicone resin, the relative expression of epoxy (25 ** ) is the weight ratio (%) of epoxy to the total solid weight of acrylic resin and melamine resin.

[0043] Referring to Tables 1 to 3, Examples 1 to 4 are overcoat film composition paints according to the present disclosure. The overcoat film compositions formed using these paints all exhibited durability times of 8 hours or more. Examples 5 to 16 are also overcoat film composition paints according to the present disclosure. The overcoat film compositions formed using these paints exhibited the following properties.

[0044] Example 1 is an example in which the proportion of resin in Comparative Example 1 is increased. The durability time of Example 1 was 6 hours longer than that of Comparative Example 1. Therefore, within the range of 10 parts by weight to 100 parts by weight of resin per 100 parts by weight of oligomer, the protective effect improved as the proportion increased.

[0045] In Example 2, a methyl silicone resin and a methyl phenyl silicone resin were used in combination with the resin of Example 1. The durability of Example 2 was 2 hours longer than that of Example 1. Therefore, the presence of a phenyl group in the resin further improved the protective effect.

[0046] Example 3 is obtained by adding conductive particles to Example 2. The durability time of Example 3 was +2 hours compared to Example 2. Therefore, the addition of conductive particles further improved the protective effect.

[0047] In Example 4, the oligomer of Example 1 was used in combination with a methyl silicone resin and a methyl phenyl silicone resin. The durability of Example 4 was +1 hour compared to Example 1. Therefore, the protective effect was improved by the presence of a phenyl group in the oligomer.

[0048] Example 5 is obtained by adding conductive particles to Example 4. The durability time of Example 5 was +1 hour compared to Example 4. Therefore, the protective effect was improved by adding conductive particles.

[0049] In Example 6, the oligomer of Example 2 was used in combination with a methyl silicone resin and a methyl phenyl silicone resin. The durability of the overcoat film composition of Example 6 was 2 hours longer than that of Example 2. Therefore, the presence of a phenyl group in the oligomer further improved the protective effect.

[0050] Example 7 is the same as Example 3 except that the proportion of conductive particles is increased, and Example 2 to which conductive particles are added. The durability of Example 7 was -1 hour compared to Example 3 and +1 hour compared to Example 2. This shows that the effect decreased as the proportion of conductive particles increased, indicating that there is an upper limit to the proportion of conductive particles. Furthermore, the protective effect improved by adding conductive particles.

[0051] Example 8 is the same as Example 3 except that the proportion of conductive particles was reduced, and Example 2 to which conductive particles were added. The durability of Example 8 was -1 hour compared to Example 3 and +1 hour compared to Example 2. Comparing Examples 7 and 8 with Example 3, it can be said that the optimum proportion of conductive particles is below 15%. Furthermore, the addition of conductive particles improved the protective effect.

[0052] In Example 9, the resin content of Example 1 was reduced and the resin content of Comparative Example 1 was increased. The durability of Example 9 was -3 hours compared to Example 1 and +3 hours compared to Comparative Example 1. Therefore, it can be said that the resin content is preferably more than 10 parts by weight per 100 parts by weight of the total solid content of the oligomer.

[0053] In Example 10, the resin ratio was increased compared to Example 1 and decreased compared to Comparative Example 2. The durability time of Example 10 was -2 hours compared to Example 1 and +4 hours compared to Comparative Example 2. Therefore, it can be said that it is desirable for the resin ratio to be less than 300 parts by weight per 100 parts by weight of the total solid content of the oligomer.

[0054] In Example 11, the epoxy ratio was reduced from Example 1 and increased from Comparative Example 3. The durability of Example 11 was -2 hours compared to Example 1 and +5.5 hours compared to Comparative Example 3. Therefore, it can be said that it is preferable that the epoxy ratio be more than 10 parts by weight per 100 parts by weight of the total solids weight of the oligomer and resin.

[0055] In Example 12, the epoxy ratio was increased compared to Example 1 and decreased compared to Comparative Example 4. The durability of Example 12 was -2 hours compared to Example 1 and +3 hours compared to Comparative Example 4. Therefore, it can be said that it is desirable for the epoxy ratio to be less than 200 parts by weight per 100 parts by weight of the total solids content of the oligomer and resin.

[0056] In Example 13, the epoxy in Example 2 was replaced with an epoxy containing multiple epoxy groups. The durability time of Example 13 was +1 hour compared to Example 2. Therefore, the protective effect was improved by using an epoxy containing multiple epoxy groups.

[0057] Example 14 is obtained by adding conductive particles to Example 13. The durability of Example 14 was 4 hours longer than that of Example 13. Therefore, the addition of conductive particles further improved the protective effect.

[0058] Example 15 is an example in which the type of epoxy containing multiple epoxy groups was changed from that of Example 13. The durability time of Example 15 was equivalent to that of Example 13.

[0059] Example 16 is obtained by adding conductive particles to Example 15. The durability of Example 16 was 3 hours longer than that of Example 15. Therefore, the addition of conductive particles further improved the protective effect. As described above, although there were differences in durability, Examples 1 to 16 all showed a durability of 5 hours or more.

[0060] On the other hand, the durability of all the comparative examples was 3 hours or less. Comparative Example 1 is an example where the amount of silicone resin was small. Comparative Example 2 is an example where the amount of silicone resin was too large. From this, it can be said that the amount of silicone resin needs to be more than 10 parts by weight and less than 300 parts by weight based on the total weight of the oligomer.

[0061] Comparative Example 3 is an example where the epoxy content is low, while Comparative Example 4 is an example where the epoxy content is high. From this, it can be said that the epoxy content must be more than 10 parts by weight and less than 200 parts by weight, based on 100 parts by weight of the total of the silicone oligomer and silicone resin. In particular, Comparative Example 3, which contains a low amount of epoxy, only maintained the protective film for 30 minutes, demonstrating the importance of the epoxy.

[0062] Comparative Example 5 is an example in which neither oligomer nor resin was used. In Comparative Example 5, the protective film peeled off in 30 minutes. This shows that the presence of silicone is important for maintaining the protective film in an environment in which the presence of strong acid and hydrogen peroxide causes significant damage to the protective film. [Industrial Applicability]

[0063] The protective film composition according to the present disclosure can be suitably used not only as a protective film composition for use in electrodes when electrolyzing a liquid to be treated that contains strong acid and hydrogen peroxide, but also in situations where the protected material needs to be protected from the environment in harsh environments such as strong acid and oxidizing atmospheres. [Explanation of symbols]

[0064] 10 containers 12 Liquid to be treated 14 Anode 16 Cathode 18 Constant current power supply 20 ammeter 22 Voltmeter 30 Conductive substrate 32 Catalyst layer 34 Protective film

Claims

1. a silicone oligomer; Silicone resin and containing a silicone compound containing an epoxy group, The silicone resin is contained in an amount of more than 10 parts by weight and less than 300 parts by weight per 100 parts by weight of the silicone oligomer, The composition for overcoat film contains the epoxy group-containing silicone compound in an amount of more than 10 parts by weight and less than 200 parts by weight per 100 parts by weight of the total of the silicone oligomer and the silicone resin.

2. 2. The overcoat film composition according to claim 1, wherein at least one of the silicone oligomer and the silicone resin has a phenyl group.

3. 3. The overcoat film composition according to claim 1, wherein the epoxy group-containing silicone compound contains a plurality of epoxy groups.

4. 3. The composition for an overcoat film according to claim 1, further comprising conductive particles.

5. The composition for a protective film according to claim 4, wherein the conductive particles are present in an amount of 0 to 15 parts by weight based on the total weight of the solid content of the silicone oligomer, the silicone resin, and the silicone compound containing an epoxy group.

6. a step of mixing a silicone oligomer, a silicone resin, an epoxy group-containing silicone compound, and a solvent to obtain a mixture; a step of dispersing the mixture to obtain a composition for an overcoat film, In the mixture, The silicone resin is More than 10 parts by weight per 100 parts by weight of the silicone oligomer, The range is less than 300 parts by weight, The silicone compound containing an epoxy group is 100 parts by weight of the silicone oligomer and the silicone resin in total The range is more than 10 parts by weight and less than 200 parts by weight, The solvent is in the range of 130 to 230 parts by weight per 100 parts by weight of the total solid content. A method for producing a composition for a protective film.

Images