KR20190003482A - Curable composition - Google Patents

Abstract

The curable composition of the present invention is excellent in water repellency and flowability and has good application workability, abrasion resistance and storage property, and is excellent in water repellency, lubricity, durability and the like on the metal surface, Which is useful in forming a coating film to be applied. The present invention is a curable composition comprising the following (A) to (C). (A) 1.0 to 30 parts by mass of an aluminum-based condensation reaction catalyst (B) with respect to 100 parts by mass of a silicone resin having a hydrolyzable reactor at a viscosity of 50 to 500 mm ² s ^-1 at 25 ° C. (C) 600 to 1,700 parts by mass of an organic solvent having a temperature ranging from the point of application to the point of searing in a range of 140 to 200 占 폚 and containing 40% by mass or more of a naphthenic hydrocarbon compound.

Description

Curable composition

The present invention relates to a curable composition which contains a combination of a polyorganosiloxane compound having a specific viscosity range, a catalyst composed of a specific metal compound, and a volatile organic compound having a specific boiling range in a specific composition ratio And relates to a curable composition which can be cured under a room temperature environment to form a film which imparts water repellency, fluidity and durability to a metal surface, a coated surface or a resin surface, particularly preferably a coating surface such as a car body.

BACKGROUND ART [0002] Heretofore, coating and coating of a solid, semi-solid or liquid curable composition has been carried out for the purpose of protecting and improving the appearance of a coated steel sheet of an automobile body. Examples of such a curable composition include a composition comprising a moisture-curable organopolysiloxane, an organic solvent and a curing catalyst in which volatile organopolysiloxane oil and volatile dimethylpolysiloxane are added (Patent Document 1) and a composition containing a high- (Patent Document 2) is known. However, these compositions are difficult to exhibit water repellency over a long period of time because the non-reactive organopolysiloxane oil will volatilize over time.

In order to solve the above problems, there have been proposed various compositions comprising a moisture-curable silicone oligomer, an organic solvent, a curing catalyst, and a silicone oil having a reactive functional group in the molecule. Patent Document 3 discloses the use of a reactive silicone oil having reactive groups selected from the group consisting of a carbinol group, a carboxy group, an amino group, and a hydroxyl group (silanol group) at both ends of a molecular chain, and Patent Documents 4 and 5 Discloses that a low-viscosity reactive silicone oligomer having an alkoxysilyl group at the end of a molecular chain is diluted with an alcohol-based solvent, a paraffin-based solvent, an aromatic-based solvent, an ester-based solvent or a glycol-based solvent have. In Patent Document 6, it has been proposed to use a reactive silicone oil having a carbinol group or an amino group in a side chain of a molecule, and Patent Document 7 proposes that a fluorine-containing alkoxysilane is contained. Patent Document 8, Patent Document 9, Patent Document 10 and Patent Document 11 disclose that a reactive silicone oligomer having an alkoxysilyl group at the molecular chain end is diluted with a large amount of a solvent such as isoparaffin or kerosene. Patent Document 12 discloses that a reactive silicone oligomer is diluted with an isoparaffin-based solvent having a high boiling point.

Japanese Patent Application Laid-Open No. 10-36771 Japanese Patent Laid-Open Publication No. 2013-194058 Japanese Patent Application Laid-Open No. 2008-75021 Japanese Patent Application Laid-Open No. 2006-45507 Japanese Patent Application Laid-Open No. 2007-161989 Japanese Patent Laid-Open No. 2010-31074 Pamphlet of International Publication WO1996 / 000758 Japanese Patent Laid-open Publication No. 2009-138063 Japanese Patent Laid-open Publication No. 2009-138062 Japanese Patent Laid-Open Publication No. 2013-166957 Japanese Patent Laid-Open No. 2010-202717 Japanese Patent Laid-Open Publication No. 2012-241093

However, all of these compositions are difficult to simultaneously satisfy properties such as storage stability in an uncured state, water repellency of a cured coating film, water sliding property (water resistance), and wear resistance. Further, in order to uniformly apply these compositions, it is necessary to wipe with a wet cloth or a liquid agent for separate wiping. If it is desired to wipe only with a dry cloth, the wipe can not be smoothly wiped off, There was a difficulty in the workability at the time of coating that the coating film formation was difficult.

Thus, in the conventional film-forming curable composition, it has been difficult to satisfy the characteristics required for a coating film or the like. In the present invention, as a result of intensive studies for the purpose of improving these properties, the present invention relates to the use of the curable composition having the following constitution. (A) 100 parts by mass of a silicone resin having a viscosity at 25 ° C of 50 to 500 mm ² s ^-1 and having a hydrolyzable reactor, (B) 1.0 to 30 parts by mass of an aluminum-based condensation reaction catalyst, and (C) Or 600 to 1,700 parts by mass of an organic solvent having a temperature in the range of from 140 to 200 DEG C and an naphthene hydrocarbon compound in an amount of 40% by mass or more from the extreme point to the boiling point.

The present invention also includes the following embodiments. In the second embodiment, when the temperature from the boiling point or the superpowder point to the boiling point of the above (C) is in the range of 142 to 175 캜 and there is no boiling point at a single temperature, the temperature difference ) Is in the range of 20 占 폚.

The third embodiment is the curable composition described in the first or second embodiment, wherein the curable composition forms a film on the surface of the steel sheet or the coated steel sheet.

The fourth embodiment is the curable composition described in the third embodiment, wherein the steel sheet or the coated steel sheet is the automobile body.

The fifth embodiment is characterized in that the curable composition described in any one of the first to fourth aspects is applied to the surface of a vehicle body of an automobile, the (C) is volatilized at room temperature or a heating environment, Or by wiping with a wet cloth and then wiping with a dry cloth.

The sixth embodiment is a cured coating formed by the film forming method described in the fifth embodiment.

By using the curable composition of the present invention, it is possible to give a coating film excellent in water repellency and ductility, excellent in abrasion resistance, shelf life, and workability in a wiping process, to a steel sheet or a coated steel sheet used for automobile body or the like .

Details of the present invention will be described below. The component (A) contained in the curable composition of the present invention is a silicone resin having a viscosity at 25 ° C of 50 to 500 mm ² s ^-1 and a hydrolyzable reactor in the molecule. The component is a component exhibiting a major function in exhibiting functions such as water repellency, fluidity and abrasion resistance in a cured coating film of the curable composition of the present invention. Herein, the silicone resin is partially hydrolyzed and de-alcohol condensed (also referred to as partial hydrolysis condensation in the present specification) by a known catalyst such as an acid, a base or an organic tin compound, an organic titanium compound or the like to give a polyfunctional alkoxysilane compound And is a silicone compound having a hydrolyzable group derived from the alkoxysilane compound and having a linear or three-dimensional network structure at the molecular chain terminal and / or side chain. The compound is typically a partially hydrolyzed condensate of an alkoxysilane compound represented by the following structural formula (1).

R ¹ _x -Si (OR ² ) _{4 -x} ... Wherein R ¹ and R ² are each independently an aliphatic, alicyclic or aromatic hydrocarbon group which may have a substituent having 1 to 8 carbon atoms and is preferably an aliphatic hydrocarbon group having 1 to 5 carbon atoms, Suitably, it is a substituent selected from a methyl group, an ethyl group and a propyl group. And x is an integer of 0 to 3, preferably 0 or 1, particularly preferably 1. The preparation of the component (A) can be carried out by adding a known hydrolysis catalyst to the compound represented by the structural formula and stirring the mixture under heating in the presence of water to effect partial hydrolysis and condensation. When x is 0 or 1 in the structural formula, the polymer of the compound has an alkoxy group represented by (OR ² ) in the side chain when it becomes a linear chain, or the polymer does not become a linear structure and a three- And partially contains an alkoxy group in its structure. As the compound, x may be 2 or 3, and x is preferably 0 or 1 in order to effectively add an alkoxy group to the structure of the component (A).

Here, the component (A) has a viscosity measurement value of the compound alone at 25 占 폚 according to JIS-Z-8803 in the range of 50 to 500 mm ² s ^-1 . In the present invention, since the viscosity of the component (A) is in the above range, the cured coating of the curable composition can have good water repellency, lubricity, abrasion durability, or a plurality of these properties.

If the component (A) has the above-mentioned characteristics, a commercially available product can be suitably used. For example, when X-40-9250 (having a viscosity of about 160 mm ² s ^-1 at 25 ° C, manufactured by Shin-Etsu Chemical Co., Ltd., the R ¹ and R ² in the formula (1) 2), X-40-9225 (viscosity of 100 mm ² s ^-1 at 25 ° C, manufactured by Shin-Etsu Chemical Co., Ltd., R ¹ and R ² in the formula (1) (A compound having a weight average molecular weight of about 3,600), X-40-9246 (a product of Shin-Etsu Chemical Co., Ltd., viscosity at 25 캜 of 80 mm ² s ^-1 , R ¹ and R ² are all methyl groups and have a weight average molecular weight of about 6,000), XR31-B2733 (a product of Momentive Performance Materials Japan Kogyo Co., Ltd. having a viscosity of about 220 mm ² s ^-1 at 25 ° C, the formula ⁽¹⁾ R 1 is a methyl group and a phenyl group, R ² is a methyl group and x = 1 and the mixture is partially hydrolyzed and condensed product of the 2), SH550 (Toray-Dow Corning as to whether or according to this And the viscosity of the product, 25 ℃ and the like from about 135mm ² s ^-1, the formula ⁽¹⁾ R 1 is a methyl group and a phenyl group, R ² is a methyl group is partially hydrolyzed and condensed product of x = 2) according to, These may be used alone or in combination of plural species.

The component (B) contained in the curable composition of the present invention is an aluminum-based condensation reaction catalyst and is a catalyst for condensation reaction of a hydrolyzable group (Si-OR ² ) contained in the component (A) to be. In the present invention, by using an aluminum-based compound as the condensation reaction catalyst, it is possible to prevent deterioration of appearance due to coloring of the cured coating. As the aluminum-based condensation reaction catalyst, various organoaluminum compounds are known, and examples thereof include aluminum salt compounds such as aluminum octylate, aluminum triacetate and aluminum tristearate, aluminum trimethoxide, aluminum triethoxide, aluminum triallyl (Aluminum acetylacetate), aluminum methoxybis (acetylacetonate), aluminum ethoxybis (ethylacetoacetate), aluminum ethoxybis (acetylacetonate), aluminum triacetate ), Aluminum isopropoxybis (ethylacetoacetate), aluminum isopropoxybis (methylacetoacetate), aluminum isopropoxybis (t-butylacetoacetate), aluminum butoxybis (ethylacetoacetate) (Ethyl acetoacetate), aluminum diisopropoxy (acetylacetonate), aluminum diethoxy (acetylacetonate), aluminum diethoxy (acetylacetonate), aluminum diisopropoxy And aluminum chelate compounds such as diisopropoxy (methylacetoacetate), aluminum tris (ethylacetoacetate), aluminum tris (acetylacetonate), and aluminum octylacetoacetate diisopropoxide. These compounds may be used alone And plural species may be used in combination. Among these compounds, aluminum tris (acetylacetonate), aluminum tris (ethylacetoacetate), aluminum diisopropoxy (ethylacetoacetate), aluminum octylacetoacetate diisopropoxide, aluminum monoacetylacetonate bis (ethylacetoacetate) Are particularly suitable.

(Mixture of aluminum alkoxide compounds), CAT-AC (a mixture of aluminum alkoxide compounds, 50 mass% or less) of a commercially available product Aluminum chelate A (W) (Aluminum tris (acetylacetonate)), Aluminum chelate D (Aluminum monoacetylacetonate bis (Ethyl acetoacetate), Effective ingredient amount 76 mass%), product of Kawaken Fine Chemical Co., ), AIPD (aluminum isopropylate), ALCH (aluminum diisopropoxy (ethylacetoacetate)) and ALCH-TR (aluminum tris (ethylacetoacetate)). These may be used alone, It does not matter.

The amount of the component (B) in the present invention is in the range of 1.0 to 30 parts by weight, preferably 1.5 to 25 parts by weight, based on 100 parts by weight of the component (A). If the amount is less than the above amount, there is a possibility that the curable composition of the present invention will fail to form a cured film having sufficient strength due to poor curing. On the other hand, if the amount exceeds this amount, There is a possibility of a problem.

Component (C) contained in the curable composition of the present invention has a boiling point in the range of 140 to 200 占 폚, suitably in the range of 141 to 185 占 폚, particularly preferably in the range of 142 to 175 占 폚, Is an organic solvent containing 40 mass% or more of a compound, which is a component necessary for uniformly dissolving the component (A) and the component (B) and diluting them to form a thin film. The naphthenic hydrocarbon compound referred to in the present invention refers to a saturated hydrocarbon having a cyclic structure in the molecule, and if the compound has such a structure, the cyclic structure may have at least one functional group such as a halogen group or various organic groups. The functional group is particularly preferably a hydrocarbon group having up to about 3 carbon atoms such as a methyl group, an ethyl group, an n-propyl group and an i-propyl group from the viewpoints of reactivity, odor and viscosity of the composition. The boiling point of the component (C) is not less than the lower limit of the above range, and the curable composition of the present invention can remain in a liquid state on the substrate in a time required for forming the coating film. On the other hand, since the boiling point is not more than the upper limit of the above range, the curable composition of the present invention can have appropriate volatility, and preferable workability can be obtained. When the component is a mixture or if its boiling point is not a single temperature for any reason, the boiling point temperature range in the present invention indicates that the distillation start temperature (extreme point) and the distillation end temperature (dry point) fall within the above range. In this case, it is particularly preferable that the temperature difference (temperature distribution) between the extreme point and the dry point is in the range of 20 캜 from the viewpoint of workability.

When a cured film of the curable composition of the present invention is formed by using an organic solvent containing 40% by mass or more of a naphthenic hydrocarbon compound as the component (C), the cured product of the component (A) It is possible to spread uniformly by wiping with a dry cloth. Although a specific mechanism for expressing such a function is unknown, by using the organic solvent having the above-mentioned constitution, it can be softened to some extent by acting as a plasticizer in a cured product which has been cured on the substrate, It is considered that the cured product is spread by the external force of the material, and the thin film can be formed on the substrate.

In the present invention, the naphthenic hydrocarbon compound contained in the organic solvent may be appropriately selected from any material. When the organic solvent is a material comprising only a naphthenic hydrocarbon compound, for example, propylcyclohexane (boiling point: 155 占 폚), 1,3,5-trimethylcyclohexane (boiling point: 140 占 폚), 1,2,3 -Trimethylcyclohexane (boiling point 151 DEG C), 1,2,4-trimethylcyclohexane (boiling point 145 DEG C), cyclooctane (boiling point 149 DEG C), 1,1,3,5-tetramethylcyclohexane Cine (boiling point 148 DEG C), cyclooctane (boiling point 149 DEG C), and the like. These naphthenic hydrocarbon compounds may be used singly or as a mixture of plural kinds thereof. If the boiling point of these mixtures, that is, the point of superposition or point of inclusion, falls within the above-mentioned temperature range, A naphthene-based hydrocarbon compound. In the present invention, an organic solvent compound other than the naphthenic hydrocarbon compound may be included if the boiling point of the whole organic solvent is in the above range. In this case, the total amount of the naphthenic hydrocarbon compound in the organic solvent is 30% by mass or more.

As a commercially available product of the above-mentioned organic solvent, a product sold as a mixture of various naphthenic hydrocarbon compounds can be used. For example, Swaklin 150 (an ultracentrifugation point 145 ° C, a product point 170 ° C) manufactured by Maruzen Sekiyu Kagaku Kabushiki Kaisha, Exxsol D30 (exaggerated point 145 占 폚, gelling point 163 占 폚) manufactured by ExxonMobil, Exxsol D40 (exotherm 166 占 폚, gelling point 191 占 폚), and the like.

The composition amount of the component (C) in the present invention is in the range of 600 to 1,700 parts by mass, preferably 700 to 1,600 parts by mass with respect to 100 parts by mass of the component (A). The curable composition of the present invention can achieve both appropriate volatility and film formability due to its compositional range, and can be applied with good workability to form a homogeneous coating.

In addition, in the curable composition of the present invention, any optional component can be suitably added within a range that does not impair its properties. For example, a cohesive agent such as a reactive or non-reactive silicone oil, an alkoxysilane compound or a silane coupling agent, an anti-aging agent, an antirust agent, a colorant, a surfactant, a rheology modifier, an ultraviolet absorber, , Fragrance, filler, etc. can be selected according to the purpose.

The curable composition of the present invention can be applied to various metal, glass, ceramics, resin, and the like substrates, and is suitable for application to a metal steel sheet, a coated steel sheet, or a glass surface, It is suitable to be applied to a painted steel plate (also referred to as automotive exterior steel plate in this specification).

The present invention also relates to a method for forming a film with the curable composition. The film-forming method of the present invention is a method of forming a film by applying the curable composition to the surface of a vehicle body of a vehicle, volatilizing the (C) under a normal temperature or a heating environment, wiping with a dry cloth or wiping with a wet cloth and then wiping with a dry cloth . In the present invention, the latter method of wiping with a wet cloth and then wiping with a dry cloth may be employed. From the curable composition of the present invention, it is possible to obtain a cured coating having good characteristics by simply wiping with a dry cloth, And is excellent in workability at the time of construction.

The application means at the time of forming the film of the curable composition is not particularly limited and any suitable application means such as hand coating using a fiber impregnated with the composition, brush coating, mechanical application using an automatic machine, have. Particularly preferably, the present invention is applied to the following method. That is, the curable composition of the present invention is impregnated with a fiber such as a dried sponge or cloth in a suitable amount, spreading it thinly on the surface of the substrate by hand, and then volatilizing the volatile component by forced drying by natural drying or drying. At this time, the component (A), which is a reaction component contained in the composition, is in contact with the moisture in the air and undergoes the hydrolysis reaction by the action of the catalyst (B), and in parallel with the volatilization of the volatile component, To form a cured product. Thereafter, the cured product is spread by wiping with a dry cloth or the like to form a coating layer with a uniform cured coating. In the conventionally known curable composition, after the volatile component is volatilized at the time of construction, it is required to wipe with a damp cloth or to wipe with a dry cloth after performing surface treatment with a treatment liquid for separate wiping. On the other hand, the curable composition of the present invention may be subjected to such a post-process, but even if only a process of wiping with a dry cloth is carried out after the solvent is evaporated, a uniform cured film can be immediately obtained and the workability is excellent. Here, the cured coating film of the curable composition of the present invention is preferably a thin film, and preferably has a film thickness of approximately 0.002 to 75 탆, preferably 0.01 to 50 탆, more preferably 0.05 to 10 탆. Since the film thickness of the cured coating is in this range, good water repellency, fluidity, workability at the time of construction and abrasion resistance can be achieved.

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

(Example)

The properties of the curable composition of the present invention were evaluated in the following Examples and Comparative Examples. Here, as the composition used in the film-forming application, it is preferable that? Is not more than one in each characteristic, and it is more preferable that the total property is?. Each of the curable compositions evaluated in Examples and Comparative Examples of the present invention (hereinafter simply referred to as " composition ") was prepared by mixing the raw materials shown in Table 1 and Table 2 at the mass ratios described in the same Table, Followed by stirring.

[Water repellency and airtightness evaluation method] A black painted plate (material: SPCC-SD, standard: JIS-G-3141, dimensions: 0.8 mm x 70 mm x 150 mm, (Manufactured by Asahi Biotechnology Co., Ltd., one side of which was coated with aminoalcohide black on one side after the electrodeposition), left to stand in a room at 25 캜 for 10 minutes, and then wiped off with a dried microfibre cloth. This was further cured in a room at 25 캜 for 2 weeks to cure, and a test piece coated with each composition was obtained. One drop (about 0.05 ml) of purified water was dropped on the test piece, and the contact angle (water contact angle) of the water drop was measured using a contact angle meter (DM-500, manufactured by Kyowa Kaimen Kagaku Co., Ltd.) . The water-repellency was evaluated based on the criteria of evaluation when the water contact angle exceeded 95 deg., When the water contact angle was in the range of 83 deg. To 95 deg., And when the water contact angle was less than 83 deg. One drop (about 0.05 ml) of purified water was dropwise added to the same test piece. The slurry was gradually tilted from the horizontal state, and the angle at which the water droplet began to flow (the angle of the lost oil) was visually observed. The evaluation criteria were as follows:?,?,?,?, And?, Respectively.

[Evaluation method of abrasion resistance] A test piece coated with the composition was prepared in the same manner as in the evaluation of water repellency and water resistance. A wear resistance test was conducted on the surface of the test piece coated with the composition using a simple friction tester (manufactured by Imoto Seisakusho Co., Ltd.). In this test, a moving plate on which a test piece was fixed was moved 100 mm per reciprocating motion at a speed of 30 times per minute, and a friction material loaded with a load of 300 g was placed on the center of the moving plate at a speed of 30 revolutions per minute. The water contact angle of the surface after the abrasion was measured by the same method as above, and the abrasion resistance was evaluated. The criterion for evaluation was that the water contact angle after 300 reciprocating movements exceeded 90% of the water contact angle before abrasion was evaluated as & cir & Here, the rubbing material used in the test was a dry cylindrical clean cloth having a width of 40 mm (an absorbing cloth made of cellulose / cotton composite fiber, "Surly Bond 6644E" manufactured by Surry Bond Co., Ltd.) And the axis of the cylinder was oriented in the direction orthogonal to the moving direction of the moving plate.

[Evaluation of workability] The composition was applied to a coated plate under the same conditions as in the evaluation of the water repellency and the airtightness, and after standing for 10 minutes in a room at 25 DEG C, the excess was wiped with a dried microfibre cloth, The workability was evaluated by a sensory test. The criterion of the evaluation was that it was possible to perform the wiping lightly and uniformly, and it was judged that the feeling to be taken when wiping off was evaluated as x.

[Evaluation of shelf stability] About 50 g of each composition shown in the table was put in a 100 ml colorless transparent glass bottle and sealed. After storage for one month in a thermostatic chamber set at 40 DEG C, the shelf life was evaluated by observing the appearance of the solution with naked eyes did. The criterion of the evaluation was that no discoloration was observed at all, & cir & was a slight yellowing or browning, and & cir &

The following materials were used as the raw materials to be contained in the respective compositions of Examples and Comparative Examples. (A) a silicone resin having a viscosity at 25 ° C of 50 to 500 mm ² s ^-1 and having a hydrolyzable reactor and a comparative component thereof X-40-9250: R ¹ and R ² in the formula (1) X-40-9225: a compound having a weight average molecular weight of about 2,100 and a viscosity at 25 占 폚 of 160 mm ² s ^-1 , a product of Shin-Etsu Chemical Co., Ltd. In the above formula (1), R ¹ And R ² are all methyl groups and have a weight average molecular weight of about 3,600 and a viscosity at 25 ° C of 100 mm ² s ^-1 ; X-40-9246, a product of Shin-Etsu Chemical Co., A compound having a weight average molecular weight of about 6,000 and a viscosity at 25 캜 of 80 mm ² s ^-1 , all of R ¹ and R ² being methyl groups, KR-500 (product of Shinetsu Kakuko Kogyo Co., Ltd.) In the formula (1), R ¹ and R ² are all methyl groups, and have a weight average molecular weight of about 1,000 and a viscosity at 25 ° C of 25 mm ² s ^-1 (B) Aluminum-based condensation reaction catalyst and comparative components thereof DX9740: Aluminum alkoxide compound, manufactured by Shin-Etsu Chemical Co., Ltd. (comparative) D25: Organic titanium-based catalyst, Shin-Etsu Chemical Co., (Comparative) ORGATICS TC401: 2-propanol solution of titanium tetraacetylacetonate at a concentration of 65% by mass, (C) a product of Matsumoto Fine Chemicals Co., Ltd. The boiling point is in the range of 140 to 200 캜 And an organic solvent including a naphthenic hydrocarbon compound and a comparative component thereof, an organic solvent comprising a mixture of Swaklin 150: C ₉ alkylcyclohexane, an ultra violet spot 145 ° C, a condensation point 170 ° C, and a Maruzen Seki Yukagaku Kabushiki · Exxsol D30: An organic solvent containing about 50% of a naphthene-based hydrocarbon compound having a de-aromatization, an ultra-high point of 145 ° C, a high point of 163 ° C, ExxonMobil · Exxsol D40: An organic solvent containing about 90% of a naphthene-based hydrocarbon-removing agent, exothermic point 166 ° C, dry point 191 ° C, ExxonMobil's product · Exxsol D80: an organic solvent consisting of hydrogenated naphtha-based hydrocarbon compound , An ultracentrifugation point 205 ° C, a boiling point 240 ° C, an ExxonMobil product (comparative) Kyowa sol C-900: an organic solvent comprising an isomer mixture of C ₉ alkane, an ultracentrifugation point 131 ° C, a boiling point of 141 ° C, a KH Neochem Products

In the examples of Table 1, it was confirmed that the compositions of the present invention including the respective constituents (A) to (C) at a predetermined composition ratio were all excellent in water repellency, lubricity, abrasion resistance, workability and storage stability. In Example 7, since the material having a slightly higher boiling range is used as the component (C), since the volatilization of the component (C) at the time of construction is somewhat slowed down, the composition is slightly wiped off at the time of wiping, Is reduced, and as a result, the abrasion resistance is slightly lowered. On the other hand, according to the comparative example of Table 2, it was confirmed that the storage stability was insufficient from Comparative Example 1 and Comparative Examples 4 and 5 using, for example, (B) other than the material of the present invention. (B) and (C) were poor in water repellency and water resistance as well as storage stability. Comparative Example 3 using a material which is not within the boiling range of the present invention as the component (C) has a poor workability. Comparative Example 6 using the material of the present invention as (A) and (B) was not satisfactory in all the properties. In Comparative Examples 7 and 8 in which the compositions of (A), (B) and (C) were in a mass ratio outside the specific range of the present invention, the concentration of the composition became so thin that a sufficient film thickness could not be formed, And it was confirmed that the water repellency and the water repellency were insufficient. As described above, it was confirmed that, unless the composition contains all the predetermined constitutions of the present invention, any one or more of the above characteristics would be insufficient, so that it would not be suitable for film-forming use.

(Industrial applicability)

The curable composition of the present invention has excellent water repellency, fluidity and abrasion resistance after curing, and has excellent workability and storage property. Therefore, it is particularly useful in forming a thin film coating layer for imparting water repellency, lubricity, durability, and the like to the metal surface, the paint surface, or the resin surface of a car body and an electric vehicle of a car.

Claims (6)

(A) 100 parts by mass of a silicone resin having a viscosity at 25 ° C of 50 to 500 mm ² s ^-1 and having a hydrolyzable reactor,
(B) an aluminum-based condensation reaction catalyst in an amount of 1.0 to 30 parts by mass, and (C) a boiling point (a temperature from the ultracentrifugation point to the boiling point when there is no boiling point at a single temperature) And 600 to 1700 parts by mass of an organic solvent containing 40% by mass or more of a hydrocarbon compound. The curable composition according to claim 1, wherein the boiling point of the component (C) is in the range of 142 to 175 占 폚, and the temperature difference from the extreme point to the product point is within a range of 20 占 폚. The curable composition according to claim 1 or 2, wherein the curable composition forms a film on a surface of a steel sheet or a coated steel sheet. The curable composition according to claim 1 or 2, wherein the curable composition forms a coating on a surface of a vehicle body of an automobile. A curable composition as set forth in any one of claims 1 to 4, which is applied to the surface of an automobile body, volatilizing the component (C) at room temperature or a heating environment, and then wiping with a dry cloth or wiping with a wet cloth And then wiping with a dry cloth. A cured coating formed by the film forming method according to claim 5.