Temporary protective agent for coating agent and method for applying temporary protective agent

Abstract

To provide a temporary protective agent which enables formation of a temporary protective layer 3 for protecting a coating agent, and enables use (traveling) of an automobile, until a coating agent coated to a coated surface 1 of an automobile is film-formed, and a coating layer 2 is formed.SOLUTION: A temporary protective agent of a coating agent contains a silicone component containing a resin (MQ resin) containing M unit siloxane and Q unit siloxane as main components, and silicone oil. The MQ resin is a non-reactive resin, so does not form a continuously integrated coated film, is dotted and bonded to the surface of a coating layer 2, and forms a temporary protective layer 3. The temporary protective layer 3 in which the MQ resin is dotted and bonded covers a coating layer in a dot shape, can prevent attachment of dust to the coating layer, and performs temporary protection until the coating agent coated onto a coated surface 1 of an automobile is film-formed and the coating layer 2 is formed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a temporary protective agent and a method for applying the temporary protective agent, which form a temporary protective layer that protects a coating agent applied to a painted surface of an automobile until the coating agent forms a film and forms a coating layer. [Background technology]

[0002] Patent Document 1 describes a coating agent that is applied to the painted surface of an automobile to form a coating layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-077071 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the coating agent described in Patent Document 1 needs to be sufficiently formed into a film in order to fully function as a coating layer. If the film formation is insufficient, the coating film that becomes the coating layer will have insufficient strength, and when the automobile is used (driven), debris from exhaust gases or debris floating on the road surface may adhere to it, resulting in a dirty finish. For this reason, the coating agent needs to be cured (left to stand, protected from wind and rain, to allow the coating agent to form a film) from the time it is applied to the painted surface of the automobile until a sufficient film is formed. However, during the curing period, a place is required to leave the automobile with the coated agent still, and the automobile cannot be used, which poses a problem of possible poor work efficiency.

[0005] The present invention solves the above-mentioned problems, and aims to provide a temporary protective agent and a method for applying the same that form a temporary protective layer, allowing the automobile to be used until the coating layer is formed after the coating agent is applied to the painted surface of the automobile. [Means for solving the problem]

[0006] The temporary protective agent for a coating agent according to the present invention is a temporary protective agent that forms a temporary protective layer that protects a coating agent applied to a painted surface of an automobile until the coating agent forms a film and forms a coating layer, It is characterized by containing a silicone component including a resin (MQ resin) whose main components are M unit siloxane and Q unit siloxane, and silicone oil.

[0007] The temporary protective agent of the coating agent of the present invention contains silicone oil, so the MQ resin is diluted with the silicone oil and uniformly dispersed on the surface of the coating layer. Because the MQ resin of the temporary protective agent applied to the surface of the coating layer is a non-reactive resin, it does not form a continuous, integrated coating film, but rather bonds to the surface of the coating layer in scattered locations to form a temporary protective layer. The scattered and bonded MQ resin temporary protective layer covers the coating layer in a dotted pattern, preventing the adhesion of dirt to the coating layer. Therefore, the temporary protective agent of the coating agent of the present invention forms a temporary protective layer that provides temporary protection until the coating agent applied to the painted surface of the automobile forms a film and forms a coating layer, making it possible to use (drive) the automobile.

[0008] Here, the temporary protective agent for the coating agent may be an emulsion paint in which the silicone component is emulsified with a surfactant to form an emulsion, and water is used as a solvent.

[0009] According to this, the temporary protective agent is an emulsion paint using water as a solvent, and therefore can be easily handled.

[0010] The method for applying a temporary protective agent according to the present invention is characterized in that the temporary protective agent is applied to the painted surface of the automobile to which the coating agent has been applied, and tap water is sprayed onto the painted surface to which the temporary protective agent has been applied.

[0011] According to the method for applying a temporary protective agent of the present invention, unavoidable components contained in the temporary protective agent can be washed away and removed. [Effects of the Invention]

[0012] The temporary protective agent for a coating agent of the present invention can protect the coating agent applied to the painted surface of an automobile until the coating agent forms a film and forms a coating layer. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a model cross-sectional view with a partially enlarged view of the surface layer of an automobile coating layer protected by a temporary protective layer formed from a temporary protective agent according to one embodiment of the present invention. [Figure 2] FIG. 1 is a diagram showing the bond structure units of a silicone resin. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described below. As shown in FIG. 1, the temporary protective agent of the coating agent of this embodiment is a temporary protective agent that forms a temporary protective layer 3 that provides temporary protection until the coating agent applied to the painted surface 1 of an automobile forms a film and forms a coating layer 2. Naturally, the present invention is not limited to applications to automobiles, but can also be applied to motorcycles, railway vehicles, aircraft, and the like. In this specification, when expressing the blend amount or mass ratio of the temporary protective agent, unless otherwise specified, it is expressed in units of mass and in the paint state including volatile components.

[0015] The temporary protective agent contains a silicone component including a silicone resin (MQ resin) mainly composed of M unit siloxane and Q unit siloxane, and silicone oil.

[0016] Silicone resins containing siloxane have siloxane bonds ((-Si-O-) n ) skeleton, and is formed by a dehydration condensation reaction between the silanol groups of the siloxane bonded structural units. As shown in Figure 2, the siloxane bonded structural units that form silicone resins include M-unit siloxanes (monofunctional), D-unit siloxanes (difunctional), T-unit siloxanes (trifunctional), and Q-unit siloxanes (tetrafunctional).

[0017] M-unit siloxane is a compound in which the bonded structural unit is of the formula (RSiO 1 / 2 ) and is a monofunctional siloxane. R in the formula of the bonded structural unit is an organic substituent, and is a methyl group and / or a phenyl group (the same applies to R in the formulas of all bonded structural units in this specification). The temporary protective layer 3 formed from a temporary protective agent containing a silicone resin having a large amount of M-unit siloxanes has poor reactivity because the siloxane that forms the bonded structural unit of the silicone resin is monofunctional, making it difficult to form a continuous coating film. Note that if the silicone resin is only M-unit siloxanes, the silicone resin will become rubbery and prone to adhesion of dirt, so a mixed siloxane with Q-unit siloxanes is preferred.

[0018] Q-unit siloxane is a siloxane in which the bonded structural unit is of the formula (SiO 4 / 2), which is a tetrafunctional siloxane. The temporary protective layer 3 formed from a temporary protective agent containing a silicone resin primarily composed of M-unit siloxanes and Q-unit siloxanes contains tetrafunctional siloxanes, but most of these tetrafunctional siloxanes are bonded to monofunctional siloxanes. This prevents the siloxane bond chains from increasing, making it difficult to form a continuous coating film. Therefore, the temporary protective layer 3 formed from the temporary protective agent is scattered on the surface of the coating layer 2 it protects (covering the coating layer 2 in a dotted pattern), as shown in the enlarged view of Figure 1. The scattered temporary protective layer 3 on the surface of the coating layer 2 ensures that the majority of the surface of the coating agent forming the coating layer 2 is exposed to the outside air, preventing film formation of the coating agent. Furthermore, the scattered temporary protective layer 3 on the surface of the coating layer 2 prevents dust from adhering to the coating layer 2.

[0019] The molar ratio of M unit siloxanes to Q unit siloxanes is preferably 67:33 to 95:5 (M unit siloxanes:Q unit siloxanes). This is because the temporary protective layer 3 formed from the temporary protective agent can be scattered on the surface of the coating layer 2 without forming a continuous film, and the temporary protective layer 3 can have a hardness that makes it difficult for dirt to adhere. If the ratio of M unit siloxanes is lower than the above range, the siloxanes in the temporary protective agent may become reactive siloxanes that form siloxane bond chains, and the formed temporary protective layer 3 may become a continuous film. On the other hand, if the ratio of M unit siloxanes is higher than the above range, the temporary protective layer 3 formed from the temporary protective agent may become rubbery, and the temporary protective layer 3 may be more susceptible to dirt adhesion. More preferably, the ratio of M unit siloxane:Q unit siloxane is 70:30 to 90:10, and even more preferably, the ratio of M unit siloxane:Q unit siloxane is 72:28 to 85:15.

[0020] The ratio of M-unit siloxanes to Q-unit siloxanes can also be expressed by the R / Si ratio. In terms of the R / Si ratio, an M-unit siloxane having three organic groups per silicon atom has an R / Si ratio of 3.0. A Q-unit siloxane having zero organic groups per silicon atom has an R / Si ratio of 0. Accordingly, an R / Si ratio of 2.01 to 2.85 allows the temporary protective layer 3 formed from the temporary protective agent to be scattered on the surface of the coating layer 2 without forming a continuous film, and allows the temporary protective layer 3 to have a hardness that makes it difficult for dirt to adhere to it. The R / Si ratio is more preferably 2.1 to 2.7, and even more preferably 2.16 to 2.55.

[0021] Silicone oil is an oil that disperses silicone resin, and by uniformly dispersing the silicone resin, the temporary protective agent can be dispersed and the silicone resin can be scattered on the surface of the coating layer 2 to form the temporary protective layer 3. Note that silicone oil may damage the coating layer 2, so it is preferable to limit the amount added. As for the silicone oil, straight silicone oil or a mixture of straight silicone oil and modified silicone oil can be used.

[0022] As the straight silicone oil, dimethyl silicone oil, methylphenyl silicone oil, methylhydrogen silicone oil, and methylphenylhydrogen silicone oil can be used, with dimethyl silicone oil being preferred due to its ease of handling.

[0023] The modified silicone oil may be an amino-modified silicone oil, a mercapto-modified silicone oil, or an epoxy-modified silicone oil. By adding the modified silicone oil, the functional group as the modifying group adheres to the coating layer 2, thereby improving the durability of the temporary protective layer 3 formed from the temporary protective agent.

[0024] When the silicone oil is a mixture of straight silicone oil and modified silicone oil, the mass ratio of the straight silicone oil to the modified silicone oil is preferably straight silicone oil:modified silicone oil=5:5 to 9:1. This is because the functional groups can be adhered to the coating layer 2 and the durability of the temporary protective layer 3 can be improved. If the mass ratio of the modified silicone oil is less than the above ratio, the effect of adhering to the coating layer 2 is reduced, and the durability of the temporary protective layer 3 may not be improved. On the other hand, if the mass ratio of the modified silicone oil is more than the above ratio, the effect of adhering to the coating layer 2 may plateau, which may be uneconomical. More preferably, the mass ratio of the straight silicone oil to the modified silicone oil is straight silicone oil:modified silicone oil=6:4 to 8:2.

[0025] Silicone oil has a dynamic viscosity of 10,000mm 2 The kinematic viscosity of the silicone oil is preferably 1,000 mm / s (cSt) or less, because it allows the silicone resin to be dispersed uniformly. 2 / s or less, and more preferably 500 mm 2 The lower limit of the dynamic viscosity of silicone oil is 0.65 mm / s for general-purpose products. 2 / s.

[0026] The mixing ratio of MQ resin to silicone oil is preferably MQ resin:silicone oil = 50:50 to 99:1 by mass. If the silicone oil ratio is lower than the above, the mixture will consist almost entirely of MQ resin, and the MQ resin may not be uniformly dispersed. On the other hand, if the silicone oil ratio is higher than the above, the silicone oil may damage the coating layer 2. More preferably, the mixing ratio of MQ resin to silicone oil is MQ resin:silicone oil = 70:30 to 95:5, and even more preferably MQ resin:silicone oil = 85:15 to 95:5.

[0027] The silicone component containing the MQ resin and silicone oil is preferably emulsified in water as a solvent to form an emulsion, which makes it easier to handle. A surfactant is used for emulsification.

[0028] The surfactant may be a general-purpose anionic surfactant or a nonionic surfactant. Examples of anionic surfactants that can be used include sodium polyoxyethylene alkyl ether sulfate, triethanolamine polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene lauryl ether sulfate, sodium lauryl sulfate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, sodium higher alcohol sulfate, dodecylbenzene sulfonate, alkyl naphthalene sulfonate, and alkyl diphenyl ether disulfonate. Examples of nonionic surfactants that can be used include linear silicone polyether-modified silicone, linear silicone alkyl-co-modified polyether-modified silicone, branched silicone polyether-modified silicone, branched silicone alkyl-co-modified polyether-modified silicone, polyoxyethylene alkyl ether, polyoxyethylene alkylene alkyl ether, and polyoxyethylene distyrenated phenyl ether. The HLB value of the nonionic surfactant is preferably 8 to 18. This is because it allows for optimal emulsification of the silicone component. More preferably, the HLB value is 13 to 15.

[0029] The surfactant is preferably added in an amount of 1 to 10% by mass relative to the total amount of silicone components (MQ resin and silicone oil). This is because it allows for favorable emulsification. If the amount added is less than 1% by mass, the emulsion stability may be poor, and the MQ resin may separate from the water. On the other hand, if the amount added exceeds 10% by mass, the amount of surfactant becomes excessive, which may be uneconomical. More preferably, the surfactant is added in an amount of 2 to 8% by mass relative to the total amount of silicone components, and even more preferably 4 to 7% by mass.

[0030] Other additives such as antifoaming agents, dispersants, preservatives, diluents, etc. can be added to the temporary protective agent of the coating agent as needed. Note that, because other additives, including surfactants, are unavoidable components of the coating agent, adding too many of them may adversely affect the gloss and water repellency of the coating layer 2 (temporary protective layer 3).

[0031] The temporary protective agent for the coating agent can be used as a varnish paint, which is a silicone component made by mixing MQ resin and silicone oil, diluted with paint thinner, or as an emulsion paint, which is made by emulsifying the silicone component in water with a surfactant and then diluting the resulting emulsion with tap water. The varnish paint and emulsion paint are each diluted with paint thinner or tap water so that the nonvolatile content is 0.1 to 2 mass%. Examples of paint thinner that can be used include mineral spirits (petroleum hydrocarbons), acetate esters, and alcohols. It is preferable to use soft water as the tap water, as soft water contains less metal ions that may adversely affect the coating layer 2.

[0032] If the temporary protective agent is a varnish paint, it can be produced by mixing and stirring MQ resin with silicone oil and, if necessary, other additives. A general-purpose explosion-proof mixer is used for stirring.

[0033] When the temporary protective agent is an emulsion paint, it can be produced by mixing MQ resin, silicone oil, surfactant, and other additives (if necessary) with water, and then emulsifying the mixture by stirring at high speed in one go. A general-purpose explosion-proof stirrer is used for stirring.

[0034] The temporary protective agent is applied to the passenger car that has already been coated. The required amount is the pseudo volume (m) of the passenger car's total length (m) x total width (m) x total height (m). 3 ) and calculate the pseudo-volume of 1m 3 The standard is a 10g application amount per unit. 3The required amount is 100g. The temporary protective agent is sprayed in mist form using a general-purpose air sprayer. After spraying the temporary protective agent, it is immediately wiped off with a cloth.

[0035] The types of coating agents that form the coating layer 2 temporarily protected by the temporary protective agent of the present embodiment include polymer coating agents primarily made of synthetic resins such as acrylic, glass-based coating agents made by adding modified silicone to synthetic resins such as acrylic, glass coating agents primarily made of inorganic binders such as silicone resins or polysilazanes, and ceramic coating agents made by adding metal alkoxides to inorganic binders such as silicone resins or polysilazanes. The temporary protective agent of the present embodiment can provide temporary protection for coating layer 2 formed from any of these coating agents until the coating layer 2 is formed. However, it is particularly suitable for temporary protection of glass coating agents or ceramic coating agents whose film strength (coating strength) increases upon film formation. Particularly suitable coating agents are glass coating agents or ceramic coating agents made of reactive resins primarily composed of D-unit siloxanes and T-unit siloxanes. While an increase in the number of siloxane bond chains increases the strength of the coating layer, temporary protection is desirable because the reaction of the siloxane bonds takes time.

[0036] The time from application of the coating agent to application of the temporary protective agent (setting time) is preferably 5 minutes or more. This is because temporary protection can be achieved effectively. If the setting time is less than 5 minutes, there is a risk that the temporary protective agent will bond to the coating layer 2 made of the coating agent. The setting time is more preferably 8 minutes or more, and even more preferably 10 minutes or more.

[0037] When the coating agent and temporary protective agent are applied, the coating agent is in the process of forming a film and is not yet able to fully function as a coating film. The MQ resin is a non-reactive resin, and the temporary protective layer 3 made of the temporary protective agent applied to the surface of the coating agent (coating layer 2) does not form a continuous, integrated coating film, but rather forms a temporary protective layer 3 that is scattered and bonded to the surface of the coating agent. The scattered and bonded MQ resin temporary protective layer 3 prevents dirt from adhering to the coating layer. Therefore, the temporary protective agent of the coating agent forms a temporary protective layer that provides temporary protection until the coating agent applied to the painted surface of the automobile forms a film and forms a coating layer, allowing the automobile to be used (driven).

[0038] Tap water can be sprayed onto the automobile immediately after the temporary protective agent has been applied. By spraying tap water onto the temporary protective layer 3 immediately after the temporary protective agent has been applied, unavoidable components such as surfactants contained in the temporary protective agent can be washed away.

[0039] The temporary protective layer 3, which is made up of scattered and bonded MQ resin, peels off and disappears from the coating layer 3 after a certain period of time. Because the temporary protective layer 3 is in a dotted form, the temporary protective layer 3 does not peel off in a film-like manner but in dot units, and the peeling is not visible, so the aesthetic appearance of the automobile is not marred when it peels off. [Example]

[0040] The present invention will be explained in more detail below with reference to examples. The coating agents forming the coating layer 2 protected by the temporary protective agent were compared using three types of coating agents manufactured by KeePer Giken Co., Ltd. listed in Table 1: Coating Agent X: Polymer Coating Agent (Diamond Keeper, Polymer Layer, Polymer Coating Agent), Coating Agent Y: Glass Coating Agent (Diamond Keeper, Glass Layer, Glass Coating Agent), and Coating Agent Z: Glass Coating Agent (EX Keeper, Glass Layer, Glass Coating Agent) (Diamond Keeper and EX Keeper are registered trademarks). These are water-repellent coating agents. Coating Agent Y is a glass coating agent made of a reactive resin whose main components are D-unit siloxane and T-unit siloxane.

[0041] [Table 1]

[0042] (Controlled and comparative studies) The control test involved applying the above coating agents to a car, allowing them to cure for a sufficient amount of time, and then evaluating the performance of the coating layer 2. Specifically, the car was applied with the coating agents, allowed to cure for six hours, and then driven in the field (for two hours within Aichi Prefecture, including on the expressway), to serve as a control after the actual driving.

[0043] For the comparative test, the above coating agent was applied to a car, and after an insufficient curing time (10 minutes) the car was driven, and a gloss test and a water repellency test were conducted after the driving, and the results were compared with the control and evaluated. The evaluation methods for each test are as follows:

[0044] <Gloss test> In the gloss test, the difference in gloss of the test specimen (car) from the control (aged for 6 hours) was visually judged. The test specimens were then rated as follows: ⊚ (greater than the control), ◯ (equal to the control), △ (slightly inferior to the control), and × (clearly inferior to the control).

[0045] <Water repellency test> In the water repellency test, clean water was sprayed onto the test specimen using a spray bottle, and the difference in water repellency from the control was visually judged. The test specimens were then rated as follows: excellent water repellency than the control, ○ water repellency equivalent to the control, △ water repellency slightly inferior to the control, and × water repellency clearly inferior to the control.

[0046] The results of the control and comparative studies are listed in Table 2.

[0047] [Table 2]

[0048] Compared to Controls 1 to 3, which were cured for a sufficient time (6 hours), the comparative test with an insufficient curing time (10 minutes) showed clearly inferior gloss and water repellency after actual driving due to the adhesion of dust and other particles derived from exhaust gases. It is presumed that the comparative test with insufficient curing had insufficient strength of the coating layer 2, making it prone to the adhesion of dust and other particles. It can be confirmed that when the temporary protective agent of the present invention is not used, the coating layer 2 formed from the coating agent requires a sufficient curing time to fully demonstrate its functions.

[0049] (Test example) The temporary protective agents used in the coating agents of the examples were those listed in Tables 6 and 7, which were combinations of silicone resins with different ratios of M unit siloxane:Q unit siloxane listed in Table 3, silicone oils in combination with the types of straight silicone oils and modified silicone oils as needed listed in Table 4, and surfactants and diluents (mineral spirits or tap water) added as needed listed in Table 5.

[0050] [Table 3]

[0051] [Table 4]

[0052] [Table 5]

[0053] [Table 6]

[0054] [Table 7]

[0055] For these temporary protective agents, the type of coating agent used and the curing time (setting time) were changed. The gloss and water repellency were measured after actual driving and compared with the control. The amount of temporary protective agent applied was determined based on the simulated volume of a car (1 m). 3 Equivalent to 10g per square meter of the painted surface of a car (coated with coating agent). 2 The test results are shown in Table 8.

[0056] [Table 8]

[0057] (Examples 1 to 25) In Examples 1 to 25, the formulation of the temporary protective agent was changed. The coating agent to be protected was coating agent Y: glass coating agent (Diamond Keeper glass layer). 10 minutes after applying coating agent Y, the temporary protective agent was applied (sprayed in mist form and immediately wiped with a cloth). Immediately after applying the temporary protective agent, water was sprayed to wash away unavoidable components such as surfactants. Immediately afterwards, a driving test was conducted to confirm the gloss and water repellency.

[0058] In Examples 1 to 5, the temporary protective agent was an emulsion paint using water as the solvent, and the molar ratio of M unit siloxane:Q unit siloxane in the silicone resin was varied and compared as shown in Tables 6 and 2. When the M unit siloxane:Q unit siloxane ratio was in the range of 95:5 to 67:33, the coating layer 2 was successfully protected by applying the temporary protective agent 10 minutes after applying coating agent Y. Temporary protective agent 1 (Example 1), which used silicone resin A with a high molar ratio of M unit siloxane, had no problems with temporary protective performance, but was slightly sticky when touched with a finger.

[0059] In Examples 6 to 10, the temporary protective agent was an emulsion paint using water as the solvent, and the silicone oil composition was changed and compared as shown in Tables 6 and 3. Regardless of the type of straight silicone oil or the combination of straight silicone oil and modified silicone oil, the coating layer 2 could be suitably protected by applying the temporary protective agent 10 minutes after applying Coating Agent Y. Although not shown in the tables, the combination of straight silicone oil and modified silicone oil (particularly amino-modified silicone oil) provided excellent durability of the temporary protective agent.

[0060] Examples 11 to 15 were varnish paints in which the temporary protective agent was an organic solvent (mineral spirits), and the molar ratio of M-unit siloxanes to Q-unit siloxanes in the silicone resin was varied as shown in Tables 6 and 2 for comparison. Even with varnish paints, the coating layer 2 could be adequately protected by applying the temporary protective agent 10 minutes after applying coating agent Y when the M-unit siloxanes to Q-unit siloxanes ratio was in the range of 95:5 to 67:33. Temporary protective agent 11 (Example 11), which used silicone resin A with a high molar ratio of M-unit siloxanes, did not feel sticky compared to the aforementioned temporary protective agent 1 (Example 1). This is presumably due to the organic solvent.

[0061] In Examples 16 to 20, the temporary protective agent was an emulsion paint using water as the solvent, and the non-volatile content was adjusted by increasing or decreasing the amount of silicone resin and silicone oil added, as shown in Table 7. When the non-volatile content was 1.14 to 0.23 mass%, coating layer 2 could be adequately protected by applying the temporary protective agent 10 minutes after applying coating agent Y, but at 0.12 mass%, which had a low non-volatile content (active ingredient), the gloss and water repellency were inferior, and the protective effect was poor.

[0062] Examples 21 to 25 are emulsion paints in which the temporary protective agent is water-based. As shown in Table 7, the ratio of MQ resin to silicone oil was adjusted by increasing or decreasing the amount of silicone oil added to a fixed amount of silicone resin. When the MQ resin:silicone oil ratio was in the range of 75:25 to 97:3, coating layer 2 was adequately protected by applying the temporary protective agent 10 minutes after applying coating agent Y. However, temporary protective agent 21 (Example 21), with an MQ resin:silicone oil ratio of 50:50, exhibited poor gloss. It is believed that the excessive amount of silicone oil added adversely affected gloss.

[0063] (Examples 26 to 30) Examples 26 to 30 used temporary protective agent 1, an emulsion paint with water as the solvent, and compared different curing times (setting times) between the application of coating agent Y and the application of the temporary protective agent. When the setting time was 5 minutes or less, the gloss and water repellency were poor, and it is believed that the temporary protective agent had a negative effect on coating layer 2.

[0064] (Examples 31 to 40) Examples 31 to 40 are comparisons of different types of coating agents to be temporarily protected. In Examples 31 to 35, temporary protection was performed using Coating Agent X: a polymer coating agent (Diamond Keeper polymer layer). In Examples 36 to 40, temporary protection was performed using Coating Agent Z: a ​​glass coating agent (EX Keeper glass layer). It was confirmed that the temporary protection agents of the embodiments can provide suitable temporary protection even when using coating agents with different composition classifications.

[0065] (Examples 41 to 45) In Examples 41 to 45, water was not sprayed immediately after application of the temporary protective agent, and unavoidable components such as surfactants were not washed away. Because unavoidable components such as surfactants remained, the gloss and water repellency were slightly inferior.

[0066] (Other technical ideas) Other technical concepts that can be understood from the temporary protective agent of the coating agent of the embodiment configured as described above will be described below.

[0067] In the temporary protective agent for the coating agent, the silicone oil may be a mixture of straight silicone oil and modified silicone oil.

[0068] This allows the functional groups of the modified silicone oil to adhere closely to the coating layer, thereby improving the durability of the temporary protective layer 3 formed from the temporary protective agent.

[0069] In the above-mentioned coating temporary protective agent, the coating agent may be a water-repellent coating agent.

[0070] According to this method, the temporary protective agent applied to the surface of the water-repellent coating layer formed by the water-repellent coating agent has a silicone component that uses water as a solvent, which is repelled and adheres to the surface of the coating layer, forming a temporary protective layer 3 that is scattered and bonded to the surface of the coating film. After providing temporary protection until the coating film is formed, the temporary protective layer 3 formed from the temporary protective agent quickly peels off and disappears from the coating layer. This allows the coated automobile to quickly demonstrate the performance of the coating layer.

[0071] The method for applying the temporary protective agent is characterized in that the temporary protective agent is applied in the form of dots to the painted surface of the automobile to which the coating agent has been applied.

[0072] According to the method for applying a temporary protective agent of the present invention, the formation of a film of the coating agent is not hindered, and the adhesion of dust to the coating layer 2 can be prevented. [Explanation of symbols]

[0073] 1...painted surface, 2...coating layer, 3...temporary protective layer.

Claims

1. A temporary protective agent that forms a temporary protective layer to protect a coating agent applied to a painted surface of an automobile until the coating agent forms a film and forms a coating layer, A temporary protective agent characterized by containing a silicone component including a resin (MQ resin) mainly composed of M unit siloxane and Q unit siloxane, and silicone oil.

2. 2. The temporary protective agent according to claim 1, wherein the silicone component is emulsified with a surfactant to form an emulsion, and the temporary protective agent is an emulsion paint using water as a solvent.

3. A method for applying a temporary protective agent, comprising: applying the temporary protective agent according to claim 1 to the painted surface of the automobile to which the coating agent has been applied; and spraying tap water onto the painted surface to which the temporary protective agent has been applied.

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