WO2019022087A1

WO2019022087A1 - Coating-forming composition

Info

Publication number: WO2019022087A1
Application number: PCT/JP2018/027752
Authority: WO
Inventors: 克彦岸; 学桐野
Original assignee: 株式会社スリーボンド
Priority date: 2017-07-25
Filing date: 2018-07-24
Publication date: 2019-01-31
Also published as: JPWO2019022087A1; JP7108199B2

Abstract

The present invention relates to a coating-forming composition which includes: component (A), namely a mixture of coating-forming components including, in a mass ratio of (A-1)/(A-2)=1/26-1/36, component (A-1), namely a hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25˚C in the range of 100-250 mm2s-1, and component (A-2), namely a hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25˚C in the range of 21-90 mm2s-1; component (B), namely an organic aluminium compound; and component (C), namely a hydrocarbon-based organic solvent having a boiling point in the range of 100-165˚C. The content of component (A) and the content of component (B) per 1 part by mass of component (C) are 0.35-0.58 parts by mass and 0.05-0.15 parts by mass respectively. According to the present invention, provided is a coating-forming composition which is capable of forming a homogeneous coating which exhibits moderate drying properties, and excellent antifouling properties.

Description

Composition for film formation

The present invention relates to a film forming composition. More particularly, the present invention relates to a film forming composition capable of obtaining a thin film coating layer for imparting weather resistance, durability, and the like to metal surfaces, painted surfaces, resin surfaces, etc. of automobile bodies and train vehicles in particular. .

Heretofore, for the purpose of protection and improvement of the appearance, it has been practiced to apply and apply a composition for forming a solid, semi-solid or liquid film on a coated steel plate of an automobile body or the like. As such a film-forming composition, for example, a composition obtained by adding a volatile organopolysiloxane oil and a volatile dimethylpolysiloxane to a moisture-curable organopolysiloxane, an organic solvent and a curing catalyst (Patent Document 1: Japanese Patent Application Laid-Open No. Hei 10 There is known a composition (Patent Document 2: Japanese Patent Application Laid-Open No. 2013-194058) in which a high viscosity silicone gum is added. However, it has been difficult for these compositions to exhibit water repellency and slipperiness over a long period of time because the non-reactive organopolysiloxane oil evaporates over time.

In order to solve the above problems, various compositions comprising moisture-curable silicone oligomers, organic solvents, curing catalysts, and silicone oils having reactive functional groups in the molecule have been proposed. Patent Document 3 (Japanese Patent Application Laid-Open No. 2011-246664) discloses a mixture of moisture-curable silicone oligomers having different viscosities, a hydrolytic curing catalyst selected from a titanium compound and an aluminum compound, a volatilization selected from hydrocarbon compounds and the like. Disclosed is a surface water repellant composition comprising an organic solvent and a perfluoropolyether silane compound. Further, Patent Document 4 (Japanese Patent Application Laid-Open No. 2007-070606), Patent Document 5 (Japanese Patent Application Laid-Open No. 2008-038049), etc., a mixture of silicone oligomers having different viscosities, a moisture curing catalyst of a titanium compound, and n-hexane The composition for antifouling film formation which consists of an organic solvent chosen from etc. is disclosed.

However, in the compositions of Patent Documents 3 to 5, the composition ratio of high viscosity silicone oligomer to low viscosity silicone oligomer (high viscosity silicone oligomer / low viscosity silicone oligomer) is compared with about 1/4 to 1/5. And the boiling point of the diluent or solvent is not set in an appropriate range. Therefore, there is a problem that it is difficult to form a homogeneous film, and the antifouling performance of the film can not be sufficiently expressed.

In addition, from the viewpoint of workability, the film forming composition is also required to have appropriate drying properties.

Therefore, an object of the present invention is to provide a film forming composition capable of forming a uniform film having appropriate drying properties and excellent in antifouling properties. Another object of the present invention is to provide a method for forming a film using such a composition for film formation, a cured film, and a method for producing the composition for film formation.

Thus, with conventional film-forming compositions, it was difficult to simultaneously satisfy the required properties. As a result of intensive studies to improve these properties, the present inventors have found that the above-mentioned problems can be solved by using a film-forming composition having the following constitution.

That is, the first embodiment of the present invention includes the following (A) to (C), and the content of the following (A) is 0.35 to 0.58 mass with respect to 1 part by mass of the following (C) The composition for forming a film, which is a part, and the content of the following (B) is 0.05 to 0.15 parts by mass:
(A) A mixture of a film-forming component comprising the following (A-1) and (A-2) in a mass ratio of (A-1) / (A-2) = 1/26 to 1/36;
(A-1) A hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 100 to 250 mm ² s ^-1 (A-2) A range of the kinematic viscosity at 25 ° C. of 21 to 90 mm ² s ^-1 Hydrolyzable group-containing silicone oligomer (B) an organoaluminum compound; and (C) a hydrocarbon-based organic solvent having a boiling point in the range of 100 to 165 ° C.

The present invention also includes the following embodiments.

A second embodiment is the film forming composition according to the first embodiment, wherein the boiling point of (C) is in the range of 110 to 155 ° C.

The third embodiment is the composition for film formation according to the first or second embodiment, wherein (C) is a saturated aliphatic hydrocarbon solvent.

A fourth embodiment is characterized in that the (C) is at least one selected from the group consisting of 2-methyl octane, 3-methyl octane, 4-methyl octane, 4-ethyl heptane, and 2,3-dimethyl heptane And the composition for forming a film according to any one of the first to third embodiments.

A fifth embodiment is the film forming composition according to any of the first to fourth embodiments, wherein (B) contains an aluminum alkoxide compound.

The sixth embodiment is the film forming composition according to any of the first to fifth embodiments, which is used to form a film on the surface of a steel plate or a coated steel plate.

A seventh embodiment is the film-forming composition according to the sixth embodiment, wherein the steel plate or the coated steel plate is a car body of an automobile.

In the eighth embodiment, the composition for forming a film according to any of the first to fifth embodiments is applied to the surface of a steel plate or a coated steel plate, and the above (C) is applied at normal temperature or under heating environment. It is a method for forming a film, which comprises, after volatilization, further drying or wiping after further water wiping.

The ninth embodiment is the film forming method according to the eighth embodiment, wherein the steel plate or the coated steel plate is a car body of an automobile.

A tenth embodiment is a cured film obtained by curing the film forming composition according to any one of the first to seventh embodiments.

The eleventh embodiment is (A-1) a hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 100 to 250 mm ² s ⁻¹ ;
(A-2) a hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 21 to 90 mm ² s ⁻¹ ;
(B) an organoaluminum compound,
(C) A method for producing a composition for forming a film, which comprises mixing a hydrocarbon-based organic solvent having a boiling point in the range of 100 to 165 ° C.
Mixing (A-1) and (A-2) in a mass ratio of (A-1) / (A-2) = 1/26 to 1/36,
The composition for forming a film is 0.35 to 0.58 parts by mass in total of (A-1) and (A-2) with respect to 1 part by mass of (C). It is a method of producing a composition for forming a film, which comprises 0.05 to 0.15 parts by mass.

Hereinafter, embodiments of the present invention will be described. The present invention is not limited to the following embodiments. Unless otherwise specified, measurements of operations and physical properties etc. are carried out under the conditions of room temperature (range of 20 ° C. to 25 ° C.) / Relative humidity of 40 to 50% RH.

The composition for forming a film according to the present invention comprises the following (A) to (C), and the content of the following (A) is 0.35 to 0.58 parts by mass with respect to 1 part by mass of the following (C) And the content of the following (B) is 0.05 to 0.15 parts by mass:
(A) A mixture of a film-forming component comprising the following (A-1) and (A-2) in a mass ratio of (A-1) / (A-2) = 1/26 to 1/36;
(A-1) A hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 100 to 250 mm ² s ^-1 (A-2) A range of the kinematic viscosity at 25 ° C. of 21 to 90 mm ² s ^-1 A hydrolyzable group-containing silicone oligomer (B) an organoaluminum compound; and (C) a hydrocarbon-based organic solvent having a boiling point in the range of 100 to 165 ° C.

The film-forming composition having the above-mentioned constitution has appropriate drying properties and can form a homogeneous film excellent in antifouling properties. Moreover, the composition for film formation has good storability, and is excellent in workability in the wiping step. Furthermore, according to the composition for film formation, a film (film coating layer) having good weather resistance can be formed on a steel plate or a coated steel plate used for a car body of an automobile or the like. And the said coating can have the outstanding water repellency, water repellency, and abrasion resistance.

The details of the present invention will be described below.

[Composition for film formation]
<Component (A)>
Component (A) contained in the composition for film formation of the present invention comprises the following (A-1) and (A-2) as (A-1) / (A-2) = 1/26 to 1/36. A mixture of film-forming components that contain at a mass ratio of
(A-1) A hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 100 to 250 mm ² s ^-1 (A-2) A range of the kinematic viscosity at 25 ° C. of 21 to 90 mm ² s ^-1 And a hydrolyzable group-containing silicone oligomer.

Here, as the "hydrolyzable group", an alkoxy group, an alkenyloxy group, an acyloxy group, an amino group, an aminooxy group, an oxime group, an amide group and the like can be mentioned. Among them, the hydrolyzable group contained in the silicone oligomer is preferably an alkoxy group because of easy handling.

In the present specification, a hydrolyzable group-containing silicone oligomer means that a silane compound having a hydrolyzable group is partially hydrolyzed and condensed by a known catalyst such as an acid, a base or an organic tin compound, an organic titanium compound, etc. In the present specification, it is a polymer obtained by "partial hydrolytic condensation"), which has a hydrolyzable group derived from the above-mentioned silane compound at the molecular chain terminal or side chain, etc., and has a weight average molecular weight of 550 to It is a silicone compound having a linear structure, a branched structure or a three-dimensional network structure having a molecular weight of 20,000.

As a preferable form of the silane compound which has a hydrolysable group for obtaining the said silicone compound (silicone oligomer), polyfunctional alkoxysilane compounds, such as a dialkoxysilane compound, a trialkoxysilane compound, a tetraalkoxysilane compound, and monoalkoxysilane Compounds (monofunctional alkoxysilane compounds) can be mentioned. In addition, you may use the said silane compound individually by 1 type or in combination of 2 or more types.

Accordingly, it is preferable that the hydrolyzable group-containing silicone oligomer as the component (A-1) and the component (A-2) is a partial hydrolysis condensate of an alkoxysilane compound represented by the following formula (1). In addition, the said partial hydrolysis-condensation product may be obtained by using only 1 type of alkoxysilane compound represented by following formula (1), or it was obtained by combining 2 or more types. It may be one.

In the above formula (1), R ¹ and R ² are each independently an aliphatic hydrocarbon group having 1 to 8 carbon atoms which may have a substituent, an alicyclic ring having 3 to 10 carbon atoms Group hydrocarbon group or an aromatic hydrocarbon group having 6 to 10 carbon atoms. When these groups have a substituent, the substituent is not particularly limited, and examples thereof include an alkyl group, an alkenyl group, an aryl group, a halogen atom, a nitro group, a cyano group, a hydroxy group and a carboxy group. In the above, they are not substituted by the same substituent. For example, a substituted alkyl group is not substituted with an alkyl group.

Preferably, R ¹ and R ² each independently represent a substituent selected from the group consisting of an aliphatic hydrocarbon group having 1 to 5 carbon atoms and an aromatic hydrocarbon group having 6 to 10 carbon atoms. More preferably each independently a substituent selected from the group consisting of a methyl group, an ethyl group, a propyl group and a phenyl group, particularly preferably each independently a methyl group or a phenyl group is there.

In the above formula (1), x is an integer of 0 to 3. When the alkoxysilane compound represented by the above formula (1) is used alone, x is preferably an integer of 0 to 2, more preferably 1 or 2. Furthermore, when two or more of the alkoxysilane compounds are used, at least a first alkoxysilane compound in which x is an integer of 1 to 3 and a second alkoxysilane compound in which x is an integer of 0 to 3 It is preferable to use in combination (however, except that the first alkoxysilane compound and the second alkoxysilane compound both have x = 3).

As a process for producing the component (A-1) and the component (A-2), a known hydrolysis catalyst is added to the alkoxysilane compound represented by the above formula (1), and stirring is performed while warming in the presence of water. In some cases, a method of causing partial hydrolytic condensation can be mentioned, but it is not limited thereto. Here, in the above formula (1), when x is 0 or 1, when the main skeleton of the polymer of the alkoxysilane compound becomes linear, an alkoxy represented by (OR ² ) in the side chain It will have a group. In addition, when the main skeleton of the polymer does not have a linear structure, and a branched structure or a three-dimensional crosslinked body is formed, partially contain an alkoxy group represented by (OR ² ) in the structure. It becomes. The said alkoxysilane compound may contain the thing whose x is 2 or 3 in said Formula (1), However The alkoxy group is effectively effective in the structure of a component (A-1) and a component (A-2) In the above formula (1), x is preferably 0 or 1 in order to add to Further, in the above formula (1), since a polymer can not be formed only by the alkoxysilane compound in which x is 3, when x includes an alkoxysilane compound in which x is 3, x is in the range of 0 to 2 In combination, partial hydrolytic condensation is performed.

<< component (A-1) >>
Component (A-1) contained in the mixture as component (A) is a hydrolyzable group-containing silicone oligomer having a viscosity at 25 ° C. in the range of 100 to 250 mm ² s ⁻¹ . Here, the above-mentioned "viscosity" is dynamic viscosity (mm ² s ^-1 ) at 25 ° C., which is measured by a viscosity measurement method according to JIS Z 8803: 2011. For example, the kinematic viscosity can be measured by a single cylindrical rotational viscometer (B-type viscometer). Moreover, the description concerning the "hydrolyzable group-containing silicone oligomer" is as described above.

The component (A-1) is a component necessary for expressing its function in the cured film by the composition for forming a film of the present invention, and is used to form a film in concert with the component (A-2) described later. It is presumed to be a component that contributes and mainly acts on the antifouling performance. Therefore, according to the composition for film formation which concerns on this invention, it is thought that the homogeneous film excellent in antifouling property can be formed. The above mechanism is based on speculation, and its correctness does not affect the technical scope of the present invention.

The viscosity of the hydrolyzable group-containing silicone oligomer used as the component (A-1) can be controlled by those skilled in the art according to the molecular weight (weight-average molecular weight) and the composition of the oligomer.

The weight average molecular weight of the hydrolyzable group-containing silicone oligomer used as the component (A-1) is not particularly limited, but is preferably 5,000 or more and 20,000 or less, and is preferably 7,000 or more and 14,000 or less More preferable.

In addition, in this specification, the value measured by the gel permeation chromatography (Gel Permeation Chromatography, GPC) which uses a polystyrene as a standard substance shall be employ | adopted for a "weight average molecular weight." The measurement conditions are as follows;
"Measurement condition"
Column: TSKgel (registered trademark) SuperMultipore HZ-M (manufactured by Tosoh Corporation)
Flow rate: 0.35 mL / min Column temperature: 40 ° C.
Eluent: THF
Sample: Measured by dissolving 0.1% by mass of oligomer relative to 100 g of THF.

The composition of the hydrolyzable group-containing silicone oligomer used as the component (A-1) is preferably a partial hydrolysis condensate of the alkoxysilane compound represented by the above formula (1). The preferred form of the alkoxysilane compound is as described above.

Here, as the component (A-1), a synthetic product or a commercially available product can be used as long as it is a silicone oligomer having each of the above-mentioned properties. As a commercially available product, for example, X-40-9250 (Shin-Etsu Chemical Co., Ltd., kinematic viscosity at 25 ° C. is 160 mm ² s ⁻¹ , and in the above formula (1), R ¹ and R ² are both methyl groups. And a partial hydrolytic condensate obtained from a mixture of alkoxysilane compounds where x = 1 or 2, X-40-9225 (Shin-Etsu Chemical Co., Ltd., dynamic viscosity at 25 ° C. is 100 mm ² s ^-1 , the above formula) In (1), partial hydrolysis condensates of alkoxysilane compounds in which R ¹ and R ² are both methyl groups), KR-510 (Shin-Etsu Chemical Co., Ltd., product having a kinematic viscosity at 25 ° C. of 100 mm ² s ⁻¹ in the above formula (1), partial hydrolysis condensate of the alkoxysilane compound ^{R 1} is a methyl group or a phenyl group, ^{R 2} is a methyl group), XR31-B2 33 (Momentive Performance Materials Japan LLC, Ltd., dynamic viscosity 220 mm ² s ^-1 at 25 ° C., the above formula (1), ^{R 1} is methyl group or phenyl group, ^{R 2} is a methyl group And partially hydrolyzed condensates obtained from a mixture of alkoxysilane compounds in which x = 1 or 2, and the like, which may be used alone or in combination of two or more.

<< Component (A-2) >>
Component (A-2) contained in the mixture as component (A) is a hydrolyzable group-containing silicone oligomer having a viscosity at 25 ° C. in the range of 21 to 90 mm ² s ⁻¹ . Here, the above-mentioned "viscosity" is dynamic viscosity (mm ² s ^-1 ) at 25 ° C., which is measured by a viscosity measurement method according to JIS Z 8803: 2011. For example, the kinematic viscosity can be measured by a single cylindrical rotational viscometer (B-type viscometer). Moreover, the description concerning the "hydrolyzable group-containing silicone oligomer" is as described above.

Component (A-2) is presumed to be a main component in forming a cured film with the composition for film formation of the present invention, and a component contributing mainly to the formation of a homogeneous film. Therefore, according to the composition for film formation which concerns on this invention, it is thought that a homogeneous film can be formed. Component (A-2) can also contribute to the stain resistance and weatherability of the film. On the other hand, when the hydrolyzable group-containing silicone oligomer having a kinematic viscosity of less than 21 mm ² s ^-1 or more than 90 mm ² s ^-1 is used, the compatibility with the component (A-1) becomes poor, and the film formability decreases. Also, the stain resistance and the weather resistance decrease. The above mechanism is based on speculation, and its correctness does not affect the technical scope of the present invention.

The viscosity of the hydrolyzable group-containing silicone oligomer used as the component (A-2) can be controlled by those skilled in the art according to the molecular weight (weight-average molecular weight) and the composition of the oligomer.

The weight average molecular weight of the hydrolyzable group-containing silicone oligomer used as the component (A-2) is not particularly limited, but is preferably 1,000 or more and less than 5,000, preferably 1,500 or more and 2,500 or less. More preferable.

The composition of the hydrolyzable group-containing silicone oligomer used as the component (A-2) is preferably a partial hydrolysis condensate of the alkoxysilane compound represented by the above formula (1). The preferred form (structure) of the alkoxysilane compound is as described above.

As the component (A-2), synthetic or commercially available products can be used as long as they are silicone oligomers having the above-mentioned respective properties. As a commercial product, for example, KR-500 (manufactured by Shin-Etsu Chemical Co., Ltd., dynamic viscosity at 25 ° C. is 25 mm ² s ⁻¹ , and in the above formula (1), R ¹ and R ² are both methyl groups, x Partial hydrolysis condensate of alkoxysilane compound where = 1 or 2), KR-9218 (Shin-Etsu Chemical Co., Ltd., kinematic viscosity at 25 ° C. is 40 mm ² s ⁻¹ , and in the above formula (1), R ¹ is Partial hydrolytic condensation product of an alkoxysilane compound in which a methyl group or a phenyl group, R ² is a methyl group, X-40-9246 (Shin-Etsu Chemical Co., Ltd., kinematic viscosity at 25 ° C. 80 mm ² s ^-1 , the above in the formula ^(1), partial hydrolysis condensate of R 1, alkoxysilane compounds ^{R 2} are a methyl group), TSR165 (produced by Momentive performance Materials Japan LLC, Ltd., dynamic viscosity 80 mm ² s ^-1 at 25 ° C., in the above formula (1), partial hydrolysis of the alkoxysilane compound ^{R 1} is a methyl group or a phenyl group, ^{R 2} is a methyl group (Condensates) etc. can be mentioned, These may be used independently and may use multiple types together.

In the composition for film formation of the present invention, the mass ratio of the component (A-1) / (A-2) is in the range of 1/26 to 1/36. When the mass ratio of the component (A-2) to the component (A-1) is smaller than the above range (for example, (A-1) / (A-2) = 1/25, etc.), the composition for film formation Wettability to a substrate (preferably, steel plate or coated steel plate) when forming a film as a film, and it is difficult to form a uniform film formation, and a uniform film can not be formed . On the other hand, when the mass ratio of the component (A-2) to the component (A-1) is larger than the above range (for example, (A-1) / (A-2) = 1/37 etc.) Anti-staining property is insufficient. The reason is considered to be that the wettability to a substrate (preferably, a steel plate or a coated steel plate) is insufficient when the film forming composition is a film. Therefore, the composition for film formation of the present invention comprises the components (A-1) and (A-2) in a mass ratio of (A-1) / (A-2) = 1/26 to 1/36. As a result, the film-forming ability is excellent, and the stain resistance and wettability of the film are improved. In order to more easily obtain such effects, the mass ratio of (A-1) / (A-2) is more preferably in the range of 1/27 to 1/35, and 1/28 to 1/1. The range of 30 is particularly preferable.

The content of the component (A) in the composition for film formation of the present invention, that is, the sum of the content of the component (A-1) and the component (A-2) is 1 mass of the component (C) described later It is in the range of 0.35 to 0.58 parts by mass with respect to parts. When the content of the component (A) exceeds 0.58 parts by mass, the film forming ability and the antifouling property to the substrate (preferably, a steel plate or a coated steel plate) at the time of forming the film forming composition as a film decreases. Also, the wettability and the weather resistance are lowered. On the other hand, when the content of the component (A) is less than 0.35 parts by mass, the film forming ability and the antifouling property of the film become insufficient. The reason for this is considered to be that film defects occur due to too little or too much film-forming component. Therefore, by setting the content of the component (A) in the composition for forming a film of the present invention in the above range, the film forming ability is excellent, and the antifouling property, the wettability and the weatherability of the film are improved. The content of the component (A) is more preferably 0.38 to 0.50 parts by mass with respect to 1 part by mass of the component (C) to more easily obtain such effects. The range of 40 to 0.48 parts by mass is particularly preferred.

<Component (B)>
Component (B) contained in the composition for film formation of the present invention is an organoaluminum compound. The organoaluminum compound as the component (B) is known as a condensation reaction catalyst, and the hydrolyzable group (preferably, Si-OR ² ) contained in the component (A) is used as a moisture in the air Or the like to cause a condensation reaction. In the present invention, by using an organoaluminum compound as a condensation reaction catalyst, a uniform and uniform coating can be formed. Therefore, the film forming composition according to the present invention has an excellent film forming ability. Moreover, the composition for film formation which concerns on this invention can form a film with a favorable weather resistance by using not a metal compound other than but an organoaluminum compound as a condensation reaction catalyst. The reason is that by using the organoaluminum compound, the condensation reaction of hydrolyzable groups contained in the component (A) can be advanced at an appropriate rate, and a uniform film can be formed. Conceivable.

As the organoaluminum compound as the component (B), known substances used as a condensation reaction catalyst can be used.

Specific examples of the organic aluminum compound include aluminum salt compounds such as aluminum octylate, aluminum triacetate and aluminum tristearate, aluminum alkoxide compounds such as aluminum trimethoxide, aluminum triethoxide, aluminum triaryl oxide, and aluminum triphenoxide, Aluminum methoxybis (ethylacetoacetate), aluminum methoxybis (acetylacetonate), aluminum ethoxybis (ethylacetoacetate), aluminum ethoxybis (acetylacetonate), aluminum isopropoxybis (ethylacetoacetate), aluminum isopropoxybis (Methyl acetoacetate), aluminum isopropoxy bis (t-butyl ace Acetate), aluminum butoxy bis (ethyl acetoacetate), aluminum dimethoxy (ethyl aceto acetate), aluminum dimethoxy (acetyl acetonate), aluminum diethoxy (ethyl aceto acetate), aluminum diethoxy (acetyl acetonate), aluminum diisopropoxy (Ethyl acetoacetate), aluminum diisopropoxy (methyl acetoacetate), aluminum tris (ethyl acetoacetate), aluminum tris (acetylacetonate), aluminum chelate compounds such as aluminum octyl acetoacetate diisopolate, etc. it can. These may be used alone or in combination of two or more. The condensation reaction of the hydrolyzable group contained in the component (A) can be advanced at an appropriate speed, a uniform film can be formed, and the component (A) can be improved from the viewpoint of improving the weather resistance and the like. B) preferably contains an aluminum alkoxide compound.

A well-known commercial item can be used as an organoaluminum compound as a component (B), For example, DX-9740 (A mixture of an aluminum alkoxide compound) by Shin-Etsu Chemical Co., Ltd., CAT-AC (A mixture of an aluminum alkoxide compound) , 50% by mass of toluene diluted product), aluminum chelate A (W) (aluminum tris (acetylacetonate)) manufactured by Kawaken Fine Chemical Co., Ltd., aluminum chelate D (aluminum monoacetylacetonate bis (ethylacetoacetate), effective Component amount: 76% by mass), AIPD (aluminum isopropylate), ALCH (aluminum diisopropoxy (ethylacetoacetate)), ALCH-TR (aluminum tris (ethylacetoacetate)), etc. are used. These may be used alone or in combination of two or more.

The content of the component (B) in the present invention (the total amount of two or more organic aluminum compounds, if used) is 0.05 to 0.15 mass per 1 mass part of the component (C) described later The scope of the department. When the content of the component (B) exceeds 0.15 parts by mass, the reactivity of the entire resin becomes too high, and the film forming ability at the time of forming the film forming composition into a film decreases, as a result, Also, the weather resistance and the color fastness can not be made appropriate. On the other hand, if the content of the component (B) is less than 0.05 parts by mass, the reactivity is insufficient, so that the curability at the time of film formation is reduced, and it can not be used for an appropriate usable time . Accordingly, by setting the content of the component (B) in the composition for forming a film of the present invention in the above range, the film forming ability and the drying property (curability) become good, and the weather resistance and the color fastness Improve. The content of the component (B) is more preferably in the range of 0.06 to 0.14 parts by mass with respect to 1 part by mass of the component (C) to more easily obtain such effects. It is particularly preferable to set the range from .08 to 0.12 parts by mass.

<Component (C)>
The component (C) contained in the film-forming composition of the present invention is a hydrocarbon-based organic solvent having a boiling point in the range of 100 to 165 ° C. The hydrocarbon-based organic solvent as the component (C) is a component necessary for uniformly dissolving and diluting the component (A) and the component (B) to form a thin film. When the boiling point of the component (C) exceeds 165 ° C., not only the film forming ability and the drying property (curing property) are lowered, but also the wettability can not be made appropriate. On the other hand, when the boiling point of the component (C) is less than 100 ° C., the film forming ability is reduced. By setting the boiling point of the component (C) in the composition for forming a film of the present invention in the above range, the film forming ability and the drying property (curing property) become good, and the wettability is improved. The reason for this is that the boiling point is in the above-mentioned temperature range, so that the volatility of the film-forming composition becomes appropriate when forming a film, and the components (A) and (B) are not required mutually It is considered that this is because the action can be suppressed. Therefore, according to the film forming composition of the present invention, a dense film can be formed.

In order to more easily obtain the above effects, the boiling point of the component (C) is more preferably in the range of 110 to 155 ° C., and particularly preferably in the range of 120 to 150 ° C.

The hydrocarbon-based organic solvent contained in the film-forming composition of the present invention contains a solvent (hydrocarbon solvent) substantially consisting of only a hydrocarbon compound. The hydrocarbon solvent may be either an aliphatic hydrocarbon solvent or an aromatic hydrocarbon solvent. The aliphatic hydrocarbon solvent may have any of linear structure, branched structure and cyclic structure, and the aliphatic hydrocarbon solvent may have unsaturated bond. Particularly preferred components (C) in the present invention are saturated aliphatic hydrocarbon solvents. By using a saturated aliphatic hydrocarbon solvent, the interaction with the component (A) and the component (B) can be reduced, and the volatility of the component (C) is improved, thereby improving the drying property of the film forming composition. be able to.

The component (C) includes other solvents having a boiling point in the above temperature range, for example, a hydrocarbon solvent having one or more of halogen and various organic functional groups, as long as the function of the present invention is not impaired. It may be When component (C) contains such hydrocarbon solvents, the content is preferably less than 25%, more preferably less than 15%, and less than 10% based on the total amount of component (C). Is particularly preferred, and substantially 0% is most preferred. That is, it is preferable that the component (C) substantially consists of only a hydrocarbon solvent. Furthermore, it is more preferable that the component (C) consists essentially of a saturated aliphatic hydrocarbon solvent.

In addition, the boiling point may not be single temperature by the reason of containing 2 or more types of solvents as a component (C). In such a case, a solvent having a distillation start temperature (initial boiling point) and a distillation end temperature (dry point) in the above ranges is considered to correspond to the component (C) in the present invention.

In the present invention, the hydrocarbon solvent as the component (C) is not particularly limited as long as it has a boiling point in the above range. Specifically, n-octane (boiling point 126 ° C.), 2-methyl octane (also called isononane, boiling point 143 ° C.), 3-methyl octane (boiling point 144 ° C.), 4-methyl octane (boiling point 142 ° C.) Ethyl heptane (boiling point 141 ° C), 2,3-dimethylheptane (boiling point 140 ° C), 1,3,5-trimethylcyclohexane (boiling point 140 ° C), 1,2,4-trimethylcyclohexane (boiling point 145 ° C), cyclooctane (Boiling point 149 ° C), 1,1,3,5-tetramethylcyclohexane (boiling point 148 ° C), cyclooctane (boiling point 149 ° C), toluene (boiling point 111 ° C), o-xylene (boiling point 144 ° C), m-xylene (Boiling point 139 ° C.), p-xylene (boiling point 138 ° C.), ethylbenzene (boiling point 136 ° C.) and the like can be mentioned. These solvents may be used alone or in combination of two or more.

Among them, Component (C) preferably contains at least one selected from the group consisting of 2-methyl octane, 3-methyl octane, 4-methyl octane, 4-ethyl heptane, and 2,3-dimethyl heptane.

<Other ingredients>
In the composition for film formation of the present invention, optional additives can be added as long as the properties of the composition are not impaired. Such additives include, for example, reactive or non-reactive silicone oils, alkoxysilane compounds, adhesion promoters such as silane coupling agents, anti-aging agents, anti-rust agents, coloring agents, surfactants, rheology control Agents, ultraviolet light absorbers, infrared light absorbers, fluorescent agents, abrasives, perfumes, fillers and the like, and components can be selected according to the purpose.

[Method of producing composition for film formation]
The composition for film formation which concerns on this invention can be manufactured by mixing each said component by a predetermined | prescribed ratio. That is, according to another embodiment of the present invention, (A-1) a hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 100 to 250 mm ² s ⁻¹ ; Hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 21 ° C. in the range of 21 to 90 mm ² s ^-1 , (B) an organoaluminum compound, and (C) a hydrocarbon having a boiling point in the range of 100 to 165 ° C. It is a manufacturing method of the constituent for film formation which has mixing a system organic solvent, and the above-mentioned (A-1) and (A-2), and (A-1) / (A-2) = 1 The composition for forming a film includes mixing (A-1) and (A-2) with respect to 1 part by mass of the (C). In total, 0.35 to 0.58 parts by mass, 0.05 to 0. Comprising 5 parts by weight, the production method of the coating composition is provided.

The order of addition of each of the above components, the method of addition, and the like are not particularly limited. Also, the mixing method and mixing time are not particularly limited, and methods known to those skilled in the art can be used. In addition, the description in the section of the above-mentioned [composition for film formation] is used for explanation concerning the desirable composition ratio (mass ratio) of each component in the above-mentioned manufacturing method, the kind of compound, structure, etc.

[Use of composition for film formation]
The composition for film formation of the present invention can be applied to substrates of various metals, glasses, ceramics, resins and the like. Among them, application to coated steel plates, coated steel plates, and glass surfaces is preferable, and in particular to painted steel plates used in exteriors of automobiles (also referred to as automobile exterior steel plates in this specification). Use is preferred. That is, the preferable form of this invention is a form by which the said composition for film formation is used in order to form a film in the surface of a steel plate or a coated steel plate. Further, a further preferable mode is a mode in which the steel plate or the coated steel plate is a car body of an automobile.

Moreover, according to the other form of this invention, the film formation method by the composition for film formation is provided. In the film forming method of the present invention, the composition for forming a film is coated on the surface of a steel plate or a coated steel plate (preferably a car body of an automobile), and the component (C) is volatilized under normal temperature or heating environment After that, it is possible to further dry or wipe after further water wiping. That is, after volatilization of the component (C), only dry wiping may be performed, or water wiping may be performed before dry wiping. In the present specification, “normal temperature” refers to a temperature in a room temperature environment in which the temperature is not adjusted by air conditioning or the like, and means about 15 to 25 ° C. Further, in the present specification, the term "heating environment" refers to an environment heated by air conditioning, a heater (heat ray irradiation means) or the like, a constant temperature environment (for example, standing in a constant temperature chamber) set to a high temperature. Refers to an environment above room temperature, above ° C. In the present invention, a method may be adopted in which the composition for forming a film is applied to the surface of a steel plate or a coated steel plate, and after the water is wiped, it is wiped dry (that is, the construction method of the latter) After applying the composition for film formation to the surface of a steel plate or a coated steel plate, a method of performing only dry wiping (namely, the former application method) may be adopted. A cured film having good properties can be obtained by any of the above methods. Thus, the composition for film formation and the film formation method according to the present invention are characterized in that the workability at the time of application is excellent.

In addition, the application means (coating method of the composition for film formation) at the time of film formation of the said film formation method is not specifically limited, For example, hand-painting using the fiber which impregnated the said composition, brushing, Any appropriate application means such as machine coating using an automatic machine can be used. In the present invention, the following method is suitably used. That is, according to a preferred embodiment of the film forming method of the present invention, the film forming composition according to the present invention is impregnated with an appropriate amount of fibers such as dried sponge and waste and is impregnated with the film forming composition by hand. The method involves thinly spreading the surface of a steel plate or a coated steel plate (base material) and volatilizing volatile components by forced drying using natural drying or a dryer or the like. Under the present circumstances, the component (A) which is a reaction component contained in the composition for film formation contacts the moisture in air, and a hydrolysis reaction advances with the effect | action of a component (B) (namely, catalyst), In parallel with the volatilization of the volatile component, crosslinking and curing are performed on a steel plate or a coated steel plate (base material) to form a resin-like cured product. Thereafter, the cured product can be spread by drying with a dry cloth or the like to form a uniform cured coating layer. The conventionally known film forming method requires a post-process such as a process of performing surface treatment with a treatment liquid for wiping separately and then performing dry wiping with a dry cloth at the time of construction. Here, even in the film forming method of the present invention, these subsequent steps may be carried out, but according to the film forming method of the present invention, it is possible to immediately make homogeneity by carrying out only the dry wiping treatment with a dry cloth after solvent evaporation. A cured film can be obtained. That is, the film forming method according to the present invention is extremely excellent in workability.

Furthermore, according to another aspect of the present invention, there is provided a cured film obtained by curing the film forming composition. The cured film formed using the film-forming composition is excellent in antifouling property and is a uniform (uniform) film. Moreover, the said cured film is excellent in a weather resistance, and can have favorable water repellency.

Here, the cured film according to the present invention is preferably in the form of a thin film, and the film thickness thereof is preferably approximately 0.001 to 100 μm, more preferably 0.002 to 75 μm, and more preferably 0.01 to 50 μm. It is even more preferable if it is present, and particularly preferably 0.05 to 10 μm. By the film thickness of a cured film being in the said range, favorable antifouling property and weather resistance can be exhibited, and it is excellent also in the workability at the time of construction. Further, by setting the film thickness in the above range, the water repellency, the water sliding property and the abrasion resistance can be improved.

Thus, according to the present invention, there is provided a means for forming a homogeneous film having appropriate drying properties (having good workability at the time of coating) and excellent in antifouling properties. Furthermore, according to the present invention, means for forming a film having excellent weather resistance and color fastness (storage property) are provided. Furthermore, according to the present invention, means for forming a film having water repellency, water repellency and abrasion resistance can be provided. The present invention is particularly useful in forming a steel plate or a coated steel plate such as a car body of a car or a metal surface of a train car or a coated surface, or a coating for imparting water repellency, water repellency, durability to a resin surface etc. .

Hereinafter, the effects of the present invention will be described in detail by way of examples, but these examples are not intended to limit the aspects of the present invention.

The invention will be described in more detail by means of the following examples and comparative examples. However, the technical scope of the present invention is not limited to the following examples. Unless otherwise specified, the following operations, physical properties and the like were measured at room temperature (range of 20 ° C. to 25 ° C.) / Relative humidity of 40 to 50% RH.

The characteristic evaluation was performed about each film formation composition (Hereinafter, it is also only called a "composition") respectively prepared by the Example and the comparative example using the following method.

[Wettability evaluation method]
About 2 mL of each composition was soaked in tissue paper. Black coated plate (material: SPCC-SD (cold rolled steel plate), standard: JIS G 3141: 2017, dimension: 0.8 mm × 70 mm × 150 mm, coated with amino alkyd black on one side after chemical electrodeposition, Ltd. The above-mentioned tissue paper was thinly applied by hand to the entire surface of the black-painted surface of Asahi Bee Techno Co., Ltd. to prepare a test piece. The wet state of the surface was evaluated by visually observing the to-be-coated surface of this test piece immediately after the application. The criteria for evaluation were as follows. That is, the uncured liquid composition on the application surface is homogeneously present on the test piece, and the location where the composition is not present (in a so-called repelling state) is less than 10% of the entire application surface. A certain item was accepted (in the table, it was written as "o"). Moreover, the other state was made into rejection (it described with "x" in the table | surface).

[Method for evaluating film formation ability]
After the composition was applied in a room at 25 ° C. to a coated plate similar to the black coated plate used in the wettability evaluation, it was allowed to stand for 10 minutes, and then the coated surface was dried with a microfiber cloth I wiped out with. Further, the specimen was allowed to stand in a room at 25 ° C. for 12 hours for curing to obtain a test piece having a cured film (thickness: about 0.01 to 100 μm) of the composition on the surface. The film formation ability was evaluated by visually observing the coated surface of the test piece. The criteria for evaluation were as follows. That is, the cured film on the surface to be coated is a uniform cured film without unevenness, and the portion where the cured product is in the state of so-called repellence, dents or spots is less than 10% of the surface to be coated. It passed (it was written as "○" in the table). Moreover, the other state was made into rejection (it described with "x" in the table | surface).

[Stain resistance evaluation method]
On the surface of the test piece prepared under the same conditions as the test piece for evaluation of film formation ability, a character was written using an oil-based pen (Himackey (registered trademark) black made by Zebra Co., Ltd.) on which the cured film is formed. After that, the stain resistance was evaluated by visually observing the state of characters after lightly rubbing the area with a tissue paper. The criteria for evaluation were as follows. That is, the written character was removed and the ink of the oil-based pen disappeared from the coated surface was regarded as a pass (denoted by "o" in the table). Moreover, the other state was made into rejection (it described with "x" in the table | surface).

[Dryability evaluation method]
The drying time of an arbitrary part of the coated surface of the test piece prepared under the same conditions as the test piece for the evaluation of the wettability was measured by a method according to the JIS K 5600-3-3: 1999 finger dry test. The measurement was carried out at intervals of 30 minutes after the lapse of 5 minutes at room temperature (25 ° C.) after application of the composition to evaluate the drying property. The criteria for evaluation were as follows. That is, in the following table, those with a touch-to-touch time of 30 minutes or less were denoted as A, those with more than 30 minutes and 60 minutes or less as B, and those with more than 60 minutes as C. In addition, although the uniform coating film was not formed in the coating-film surface, what measured the wettability evaluation as rejection (x) touched the location where wetting exists, and measured. A is highly dry but has a short pot life at the time of construction, which is not preferable from the viewpoint of workability. C is not preferable because the drying time is long. Therefore, in the present invention, the evaluation of B is particularly preferable in view of the balance between the pot life at the time of construction and the drying property.

[Weatherability evaluation method]
The same test piece prepared in the evaluation of the film formation ability is placed in a sunshine weather meter (ATLAS Ci4000 made by Atlus Electric Devices, 6500 W water-cooled xenon arc lamp light source), and the sunlight condition (irradiance 0.5 W / m ²⁾ , A wavelength of 400 to 700 nm of irradiation light, a BP temperature of 65 ± 3 ° C., a humidity of 70 ± 5%) × 120 minutes and a rainfall condition (200 mL / min) × 30 minutes were alternately repeated, and subjected to weathering test for a total of 500 hours . After that, the same test as the test carried out in the above-mentioned antifouling evaluation was performed on the test piece, and the evaluation according to the above evaluation standard was performed.

[Color resistance evaluation method]
Immediately after production, about 50 mL of the uncured liquid of each composition was collected and sealed in a 100 mL clear, colorless glass sample bottle. The sample bottle was stored in a thermostat kept at 40 ° C., and the color fastness of the composition liquid after 30 days was visually observed to evaluate the color fastness. The criteria for evaluation were as follows. That is, compared with the initial state in which all were colorless and transparent, those in which yellowing and browning were not observed were regarded as pass (denoted by "o" in the table). Moreover, the other state was made into rejection (it described with "x" in the table | surface).

[Preparation of composition]
The following were used as the raw material contained in each composition of an Example and a comparative example. Each component was weighed so as to obtain the mass described in the following table, and mixed by a three-one motor of Shinto Kagaku Co., Ltd. for 15 minutes at 25 ° C. to obtain a composition. In addition, the unit of each component in the following table | surfaces is a "mass part."

<Component (A)>
(A-1) A hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 100 to 250 mm ² s ^-1. X-40-9250: In the above formula (1), R ¹ and R ² are Partially hydrolyzed condensate of a mixture of alkoxysilane compounds each having a methyl group and x = 1 or 2, weight average molecular weight about 7,000 to 14,000, kinematic viscosity at 25 ° C. 160 mm ² s ⁻¹ , Shin-Etsu Chemical Co., Ltd. (A-2) Hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 21 to 90 mm ² s ^-1 and its comparative component KR-500: in), neither R ^1, R ² is a methyl group, partially hydrolyzed condensate of the alkoxysilane compound is x = 1 or 2, the weight-average molecular weight of about 1,50 ~ 2,500,25 is 25 mm ² s ^-1 Etsu Chemical Co., Ltd. Comparative kinematic viscosity at ° C. (1) KR-400: In the formula ^(1), both R 1, ^{R 2} is a methyl group Partial hydrolysis condensate of alkoxysilane compound (Curing catalyst is included in the product), Dynamic viscosity at 25 ° C is 1.2 mm ² s ^-1 Shin-Etsu Chemical Co., Ltd. (In addition, the composition containing the raw material B) not added)
・ Comparison (2) KC-89S: Partial hydrolysis condensate of an alkoxysilane compound in which R ¹ and R ² in the above formula (1) are both methyl groups, and the kinematic viscosity at 25 ° C. is 5 mm ² s ^-1 Shin-Etsu Chemical Industry Co., Ltd. Comparison (3) X-40-9225: Partial hydrolysis condensate of alkoxysilane compound in which R ¹ and R ² are both methyl groups in the above formula (1), dynamic viscosity at 25 ° C. 100 mm ² s ^-1 manufactured by Shin-Etsu Chemical Co., Ltd. Comparison (4) KR-401: Partial hydrolysis of alkoxysilane compound in which R ¹ is methyl and phenyl and R ² is methyl in the formula (1). Condensate (containing curing catalyst in the product), dynamic viscosity at 25 ° C is 20 mm ² s ^-1 (Kinematic viscosity at 25 ° C is 14 mm ² s ^-1 without curing catalyst) Made by Etsu Chemical Co., Ltd. (Note that (B) is not added to the composition containing the raw material)
・ Comparison (5) X-40-2327: Partial hydrolytic condensate of an alkoxysilane compound (in which a curing catalyst is contained in the product), wherein R ¹ and R ² in the above formula (1) are both methyl groups, 25 Kinematic viscosity at 0.9 ° C 0.9 mm ² s ^-1 (Kinematic viscosity at 25 ° C. without curing catalyst 0.6 mm ² s ^-1 ) Shin-Etsu Chemical Co., Ltd. (Note that the composition contains the raw material) Does not add (B)).

<Component (B)>
(B) Organoaluminum compounds and their comparative components · DX-9740: Aluminum alkoxide compounds, Shin-Etsu Chemical Co., Ltd.-Comparison (1) D-25: Organo-titanium compounds, Shin-Etsu Chemical Co., Ltd.-Comparison (2) D-220: 25 mass% 2-propanol solution of phosphoric acid type compound, Shin-Etsu Chemical Co., Ltd. make / comparison (3) X-40-2309A: phosphoric acid type compound, Shin-Etsu Chemical Co., Ltd. make.

<Component (C)>
(C) Hydrocarbon-based organic solvent having a boiling point range of 100 to 165 ° C. and its comparative component ・ Isononane (2-methyloctane): boiling point 143 ° C. Reagents ・ Comparison (1) Isohexane (2-methylpentane): Boiling point 60 ° C. Reagents · Comparison (2) n-heptane: boiling point 98 ° C. Reagents · Comparison (3) Isooctane (2,2,4 -trimethylpentane): Boiling point 99 ° C Reagents · Comparison (4) Isodecane (2-methylnonane): Boiling point: 167 ° C Reagents · Comparison (5) n-decane: Boiling point: 172 ° C Reagent.

The compositions containing the respective components (A) to (C) in the predetermined composition ratio according to the present invention in Examples 1 to 8 in Table 1 have good film forming ability and antifouling properties. Also, it was confirmed that the drying property of the range suitable for construction was also held. Furthermore, the composition according to the present invention was good in wettability, weather resistance and color fastness.

On the other hand, Comparative Examples 1 to 5 in Table 2: In the composition using a hydrocarbon-based organic solvent having a boiling point outside the specific range of the present invention instead of (C) of the present invention, all have film forming ability It was inadequate. In particular, in Comparative Examples 4 and 5 in which the boiling range exceeds the upper limit of the range of the present invention, the wettability is also poor, and the drying property is not suitable for construction. Moreover, in Comparative Examples 1 and 2 in which the boiling range is less than the lower limit of the range of the present invention, the drying property is not suitable for construction. Comparative Examples 6 to 10: A composition using a hydrolyzable group-containing silicone oligomer having a viscosity outside the specific range of the present invention in place of (A-2) of the present invention is other than drying property and color resistance. In all the characteristics of the above, the result was inferior, and it was not for practical use. Comparative Examples 11 to 13: Any composition using a condensation reaction catalyst other than organic aluminum instead of the present invention (B) is poor in film forming ability and weatherability, and has problems in color fastness. There were many things. Comparative Examples 14 to 17: The content of (A) (content to 1 mass of the component (C)) is included in the specific range of the present invention, but the composition ratio of (A-1) to (A-2) is In the composition containing the mixture out of the specific range of the present invention, the film forming ability and / or the antifouling property was poor, and the wettability was also poor. Comparative Examples 18 and 19: In a composition whose content of (B) (content to 1 mass of the component (C)) is outside the specific range of the present invention, the content is sufficiently sufficient in Comparative Example 18 where the content is less than the lower limit. Cure speed was not obtained. Therefore, the drying property was in a range not suitable for construction. Moreover, in Comparative Example 19 in which the content exceeds the upper limit, the film forming ability is poor, and the weather resistance and the color fastness are also poor. Comparative Examples 20 and 21: The composition having the content of (A) (content with respect to 1 mass of the component (C)) outside the specific range of the present invention is poor in film forming ability and antifouling property, and further, Some were poor in wettability and weatherability.

The composition for film formation of the present invention has excellent characteristics of the film after curing. And, the composition for film formation of the present invention can be suitably used particularly for forming a thin film coating for giving protection performance to a metal surface, a painted surface or a resin surface of a car body of a car or a train car. It is useful.

This application is based on Japanese Patent Application No. 201-143606 filed on Jul. 25, 2017, the disclosure content of which is incorporated by reference in its entirety.

Claims

Including the following (A) to (C),
The content of the following (A) is 0.35 to 0.58 parts by mass, and the content of the following (B) is 0.05 to 0.15 parts by mass with respect to 1 part by mass of the following (C) , Composition for film formation:
(A) A mixture of a film-forming component comprising the following (A-1) and (A-2) in a mass ratio of (A-1) / (A-2) = 1/26 to 1/36;
(A-1) A hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 100 to 250 mm 2 s -1 (A-2) A range of the kinematic viscosity at 25 ° C. of 21 to 90 mm 2 s -1 A hydrolyzable group-containing silicone oligomer (B) an organoaluminum compound; and (C) a hydrocarbon-based organic solvent having a boiling point in the range of 100 to 165 ° C.
The film forming composition according to claim 1, wherein the boiling point of (C) is in the range of 110 to 155 ° C.
The composition for film formation of Claim 1 or 2 whose said (C) is a saturated aliphatic hydrocarbon solvent.
4. The method according to claim 1, wherein (C) comprises at least one selected from the group consisting of 2-methyl octane, 3-methyl octane, 4-methyl octane, 4-ethyl heptane, and 2,3-dimethyl heptane. The film-forming composition according to any one of the above.
The film forming composition according to any one of claims 1 to 4, wherein (B) contains an aluminum alkoxide compound.
The composition for forming a film according to any one of claims 1 to 5, which is used to form a film on the surface of a steel plate or a coated steel plate.
The composition for film formation of Claim 6 whose said steel plate or coated steel plate is a vehicle body of a motor vehicle.
A composition for forming a film according to any one of claims 1 to 5 is applied to the surface of a steel plate or a coated steel plate, and after the (C) is volatilized under normal temperature or heating environment, it is further wiped dry. Alternatively, the method for forming a film, which further comprises wiping after drying with water.
The film forming method according to claim 8, wherein the steel plate or the painted steel plate is a car body of an automobile.
A cured film obtained by curing the film forming composition according to any one of claims 1 to 7.
(A-1) A hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 100 to 250 mm 2 s −1 ;
(A-2) a hydrolyzable group-containing silicone oligomer having a kinematic viscosity at 25 ° C. in the range of 21 to 90 mm 2 s −1 ;
(B) an organoaluminum compound,
(C) A method for producing a composition for forming a film, which comprises mixing a hydrocarbon-based organic solvent having a boiling point in the range of 100 to 165 ° C.
Mixing (A-1) and (A-2) in a mass ratio of (A-1) / (A-2) = 1/26 to 1/36,
The composition for forming a film is 0.35 to 0.58 parts by mass in total of (A-1) and (A-2) with respect to 1 part by mass of (C). A method of producing a composition for forming a film, which comprises 0.05 to 0.15 parts by mass.