JP2018080291A - Aqueous coating composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aqueous coating composition which is excellent in storage stability as a composition and imparts gloss or the like to a coating film prepared.SOLUTION: There is provided an aqueous coating composition which comprises: a silicone emulsion (A) containing an alkoxysilane represented by the formula (1), an organopolysiloxane which is a hydrolyzate of the alkoxysilane, a nonionic surfactant and water; an amino group-containing alkoxysilane (B) represented by the formula (2); and water. Further, there is provided an aqueous coating composition in which at least one organic solvent selected from a hydrocarbon-based solvent, an aromatic solvent, an ester-based solvent, an alcohol-based solvent or a ketone-based solvent is not blended. Xn-Si-(OY)4-n (1), Z-Si(-R)m-(OY)3-m (2) (X is an alkyl group having 1 to 18 carbon atoms; Y is an alkyl group having 1 to 4 carbon atoms; Z is an alkylamine chain having primary to tertiary amine selected; R is an alkyl group having 1 to 4 carbon atoms; m is an integer of 0 to 2; and n is an integer of 1 to 3.)SELECTED DRAWING: None

Description

  The present invention relates to a water-based coating composition that gives a gloss to the surface of an object to be coated by applying it to the surface of a desired article such as a glass of a vehicle or a vehicle body, and contains water as a solvent.

  Conventionally, as a polishing agent for vehicles such as automobiles, waxes mainly composed of carnauba wax and petroleum wax, modified silicones such as dimethyl silicone and amino silicone, or silicones such as silicone resin are mainly used as a wax. The polymers have poor durability, and the silicones are easily contaminated and it is difficult to formulate reactive cured products.

  In recent years, silazanes and alkoxysilanes dispersed and dissolved in an organic solvent are processed into an object to be coated by spraying, hand coating, etc., and a glassy effect film is formed in the drying process. Paints with excellent gloss and durability are known.

  For example, in Patent Document 1, a silicone resin obtained by hydrolyzing and condensing an alkoxysilane such as methyltrimethoxysilane with an acid such as hydrochloric acid, α-methyl-D-glucoside, a surfactant, water and the like are mixed with an emulsifier. A polished polish is disclosed.

JP 2000-63755 A

  However, the composition of Patent Document 1 has a problem that it is not necessarily good with respect to durability such as gloss and water repellency of the coating film after the coating film is prepared.

  Moreover, in the composition of the cited document 1, there is also an example containing an organic solvent, and the environmental improvement of the site where the coating work is performed is more demanded, and a coating composition containing no organic solvent is There were also issues that were being sought.

  Accordingly, an object of the present invention is to provide a water-based coating composition that is excellent in storage stability as a composition, imparts gloss, water repellency, and antifouling properties to the prepared coating film, and is excellent in durability.

  The inventors of the present invention have made extensive studies on the coating composition, specified the specific surface area of the silica particles and the type of the surface treatment agent, and formulated a compound having an amino group among the alkoxysilanes, thereby ensuring stable storage as a composition. It has been found that it is possible to create a coating film that is excellent in properties, imparts gloss, water repellency and antifouling properties, and is excellent in air resistance, and has arrived at the present invention based on these findings.

[1] That is, the present invention provides:
(A-1) an alkoxysilane represented by the following general formula (1);
Xn-Si- (OY) 4-n (1)
(Wherein X is an alkyl group having 1 to 18 carbon atoms, Y is an alkyl group having 1 to 4 carbon atoms, and n is an integer of 1 to 3)
(A-2) an organopolysiloxane that is a hydrolysis-condensation product of the alkoxysilane;
(A-3) a nonionic surfactant;
(A-4) (A) silicone emulsion containing water;
(B) an amino group-containing alkoxysilane represented by the following general formula (2);
Z-Si (-X) m- (OY) 3-m (2)
Wherein Z is an alkylamine chain having at least one amine selected from primary to tertiary, X is an alkyl group having 1 to 4 carbon atoms, Y is an alkyl group having 1 to 4 carbon atoms, and m is 0 to 2 Integer)
(C) A water-based coating composition containing water.

  [2] And the amino group-containing alkoxysilane is 3-aminopropylmethoxysilane, 3-aminopropylethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (amino) The water-repellent coating composition as described in [1] above, which is at least one selected from ethyl) -3-aminopropyltrimethoxysilane and N-phenyl-3-aminopropyltrimethoxysilane.

  [3] And at least one organic solvent selected from hydrocarbon, aromatic, ester, alcohol and ketone is not blended. An aqueous coating composition.

  According to the present invention, it is possible to produce a coating film that is excellent in storage stability as a composition, imparts gloss, water repellency and antifouling properties, and is excellent in air resistance.

  Hereinafter, the embodiment regarding the water-based coating composition of this invention is described in detail. In addition, the description which shows the range in description contains an upper limit and a minimum.

  The coating composition of the present invention contains (A) a silicone emulsion, (B) a specific amino group-containing alkoxysilane, and (C) water. As will be described later, a composition containing at least these components is used to create a coating film that has excellent storage stability as a composition and exhibits excellent performance in surface gloss, water repellency and antifouling after the coating film is prepared. it can.

  (A) A silicone emulsion includes (a-1) a specific alkoxysilane, (a-2) an organopolysiloxane that is a hydrolysis condensate of the alkoxysilane, and (a-3) a nonionic surfactant. And (a-4) an emulsion containing water. (A) With respect to the silicone emulsion, it can be formulated by adjusting each component itself so as to meet the conditions described later, or a commercially available product can be purchased.

The (a-1) alkoxysilane contained in the present invention is a compound represented by the following general formula (1).
Xn-Si- (OY) 4-n (1)
(Wherein X is an alkyl group having 1 to 18 carbon atoms, Y is an alkyl group having 1 to 4 carbon atoms, and n is an integer of 1 to 3)
According to the said alkoxysilane, it couple | bonds with the base material to apply | coat, and can give glossiness, hydrophilicity, and antifouling property to a coating film. X and Y in general formula (1) are independent of X and Y in general formula (2).

  Examples of the alkoxysilane include monofunctional trimethylmethoxysilane, triethylmethoxysilane, trimethylethoxysilane, triethylethoxysilane, bifunctional dimethyldimethoxysilane, diethyldimethoxysilane, diisopropyldimethoxysilane, diisobutyldimethoxysilane, dimethyldiethoxy. Silane, diethyldiethoxysilane, etc., trifunctional methyltrimethoxysilane, ethyltrimethoxysilane, n-propyltrimethoxysilane, isopropyltrimethoxysilane, n-butyltrimethoxysilane, isobutyltrimethoxysilane, n-hexyltri Methoxysilane, n-octyltrimethoxysilane, n-decyltrimethoxysilane, n-dodecyltrimethoxysilane, n-tetradecyltrime Xisilane, n-hexadecyltrimethoxysilane, n-octadecyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, n-propyltriethoxysilane, isopropyltriethoxysilane, n-butyltriethoxysilane, isobutyltriethoxysilane N-hexyltriethoxysilane, n-octyltriethoxysilane, n-decyltriethoxysilane, n-dodecyltriethoxysilane, n-tetradecyltriethoxysilane, n-hexadecyltriethoxysilane, n-octadecyltriethoxy Silane and the like are preferable, and the above trifunctional alkoxysilane is more preferable. One or two or more of these can be used in combination.

  Moreover, it is preferable that the content rate of the alkoxysilane represented by (a-1) general formula (1) in (A) silicone emulsion is 1 to 30 weight%, and it is 2 to 25 weight%. preferable. (A-1) When the content ratio of the alkoxysilane represented by the general formula (1) is within this range, the surface of the base material to be coated is given gloss, water repellency, and antifouling property, and further by hydrolysis. Aggregation is less likely to occur and storage stability can be improved.

  The organopolysiloxane (a-2) hydrolyzed condensate of alkoxysilane contained in the present invention is obtained by dehydrating condensation of the hydrolyzed alkoxysilane represented by general formula (1) (a-1). It is a polymer formed.

  The organopolysiloxane has a polymerization average molecular weight of preferably 200 to 10,000, more preferably 300 to 6,000. When the polymerization average molecular weight of the organopolysiloxane is within this range, the surface of the substrate to be coated is given gloss, water repellency, and antifouling properties, and further, aggregation due to hydrolysis hardly occurs and storage stability is improved. be able to. In addition, as a method for measuring the polymerization average molecular weight of the organopolysiloxane, it is preferably calculated by standard GPC method (gel permeation chromatography) using toluene as a developing solvent in terms of standard polystyrene.

  Moreover, it is preferable that the content rate of (a-2) organopolysiloxane which is the hydrolysis-condensation product of the said alkoxysilane in a silicone emulsion is 1-30 weight%, It is 1-20 weight%. It is preferable. When the content ratio of the organopolysiloxane is within this range, the surface of the base material to be coated is given gloss, water repellency, antifouling property, and further, aggregation due to hydrolysis is less likely to occur and storage stability is improved. Can do.

The (a-3) nonionic surfactant contained in the present invention is a linear or branched alkyl chain having 12 to 20 carbon atoms and an oxy represented by —CH ₂ CH ₂ O—. Polyoxyethylene (POE) alkyl ether, polyoxypropylene (POP) alkyl ether, polyoxyethylene (polyoxyethylene (POE) alkyl ether composed of at least one of an ethylene unit or an oxypropylene unit represented by —CH ₂ CH (CH ₃ ) O— Surfactant such as POE) polyoxypropylene (POP) alkyl ether. As an oxyethylene unit and an oxypropylene unit, it is preferable to contain 1-100, Preferably it is 1-50, More preferably, it contains 1-20. When both the oxyethylene unit and the oxypropylene unit are present in the nonionic surfactant, the oxyethylene unit and the oxypropylene unit can be bonded in a random or block manner, respectively.

  (A-3) Specific examples of the nonionic surfactant include POE (7) lauryl ether, POE (9) lauryl ether, POE (11) lauryl ether, POE (10) cetyl ether, and POE (15) cetyl. Ether, POE (20) cetyl ether, POE (5) oleyl ether, POE (10) oleyl ether, POE (20) oleyl ether, POP (5) lauryl ether, POP (7) cetyl ether, POP (10) oleyl ether , POE (3) POP (5) lauryl ether and the like. The numbers in parentheses for POE and POP indicate the number of units of oxyethylene units and oxypropylene units.

  Moreover, it is preferable that the content rate of (a-3) nonionic surfactant in (A) silicone emulsion is 1 to 10 weight%, and it is preferable that it is 2 to 8 weight%. (A-3) When the content ratio of the nonionic surfactant is within this range, the emulsion stability of the (A) silicone emulsion can be maintained.

  The water (a-4) contained in the present invention is for making (A) the silicone emulsion into an emulsion. (A-4) As water, arbitrary water, such as purified water, ion-exchange water, and industrial water, can be used. Moreover, the trace component contained in water may also be contained in the range which does not affect the curability at the time of (A) silicone emulsion emulsion formation and coating film preparation.

  Moreover, it is preferable that the content rate of (a-4) water in (A) silicone emulsion is 30 to 70 weight%, and it is preferable that it is 40 to 60 weight%. (A-4) When the content ratio of water is within this range, (A) the emulsion stability of the silicone emulsion can be maintained.

  And the content rate of the (A) silicone emulsion in the water-based coating composition of the present invention is preferably 0.05 to 10% by weight, and more preferably 1 to 5% by weight. (A) When the content ratio of the silicone emulsion is within this range, the gloss, water repellency and antifouling property of the article to be coated can be continuously maintained.

The (B) amino group-containing alkoxysilane contained in the present invention is a compound represented by the following general formula (2).
Z-Si (-X) m- (OY) 3-m (2)
Wherein Z is an alkylamine chain having at least one amine selected from primary to tertiary, X is an alkyl group having 1 to 4 carbon atoms, Y is an alkyl group having 1 to 4 carbon atoms, and m is 0 to 2 Integer)
According to the amino group-containing alkoxysilane, when the emulsion of (A) silicone emulsion is broken by applying the water-based coating composition of the present invention, (a-1) represented by the general formula (1) While (a-2) the hydrolysis of the alkoxyl group in the organopolysiloxane, which is a hydrolysis condensate of the alkoxysilane, can be promoted by amino groups, and a strong coating film can be formed. In the coating composition, since the reaction with the silicone emulsion (A) is extremely difficult to occur, the storage stability is excellent. And since (B) hydrolytic condensation reaction advances during coating film preparation with the amino group-containing alkoxysilane represented by the general formula (2), (A) of (a-2) organopolysiloxane in the silicone emulsion Since it can be used even if the degree of condensation is not so high, the viscosity is low and it is easy to handle. (A) Preparation of silicone emulsion, easy mixing when preparing the aqueous coating composition of the present invention, There is also an effect that a uniform coating film can be produced. In addition, X and Y in General formula (2) are independent of X and Y in General formula (1).

  Examples of the amino group-containing alkoxysilane include 3-aminopropylmethoxysilane, 3-aminopropylethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl)- 3-aminopropyltrimethoxysilane and N-phenyl-3-aminopropyltrimethoxysilane are preferred. One or two or more of these can be used in combination.

  Moreover, it is preferable that the content rate of the (B) amino group containing alkoxysilane in the water-based coating composition of this invention is 0.05 to 0.1 weight%. When the content ratio of the alkoxysilane is within this range, the gloss, water repellency, and antifouling property of the coated object can be continuously maintained.

  (A) The compounding ratio of the silicone emulsion and the (B) amino group-containing alkoxysilane represented by the general formula (2) is (B) the amino group-containing alkoxysilane represented by the general formula (2) is ( A) It is preferable to mix | blend with 0.5-20 weight% with respect to a silicone emulsion, and also it is preferable to mix | blend with 1-10 weight%. When the blending ratio of the (A) silicone emulsion and the (B) amino group-containing alkoxysilane represented by the general formula (2) is within this range, aggregation due to hydrolysis is less likely to occur and storage stability is improved. In addition, the gloss, water repellency, and antifouling property of the coated object can be continuously maintained.

  (C) water contained in the present invention is blended separately from (a-4) water, and contains (A) a silicone emulsion and (B) an amino group represented by the general formula (2). It is a solvent for uniformly dispersing alkoxysilane. (C) As water, (a-4) Like water, arbitrary water, such as purified water, ion-exchange water, and industrial water, can be used. Moreover, the trace component contained in water may also be contained in the range which does not affect the sclerosis | hardenability at the time of coating-film preparation.

  Moreover, it is preferable that the content rate of (C) water in the water-based coating composition of this invention is 89.9-99.45 weight%, and it is preferable that it is 94.9-98.95 weight%. When the water content is in this range, aggregation due to hydrolysis is less likely to occur and storage stability can be improved, and since the organic solvent described later is not contained, the worker who performs the coating operation depends on the organic solvent. It can prevent being affected by acute or chronic poisoning.

  The water-based coating composition in the present invention includes hydrocarbon solvents such as n-hexane, cyclohexane and cyclohexene, aromatic solvents such as toluene, benzene and xylene, ester solvents such as ethyl acetate, methanol, ethanol and isopropanol. Organic solvents such as alcohol solvents, ketone solvents such as methyl ethyl ketone and methyl isobutyl ketone are not blended. By not blending these organic solvents, it is possible to prevent the worker who performs the coating work from being attacked by acute or chronic poisoning by the organic solvent in a construction factory such as a dealer. It should be noted that alcohol solvents such as methanol and ethanol generated by hydrolysis of alkoxyl groups such as alkoxysilane are generated by the reaction and are not blended.

  The water-based coating composition of the present invention is prepared by mixing each component and then stirring at room temperature. When the alkoxysilane, amino group-containing alkoxysilane, silica particles, and alcohol are blended, they can be blended in any order, or they can be blended simultaneously.

  And the water-based coating composition of this invention can add a ultraviolet absorber, a viscosity modifier, a coloring agent, antiseptic | preservative, a pH adjuster etc. as needed.

  The water-based coating composition of the present invention preferably uses glass, resin, metal, ceramics, or the like as a target base material.

  The method for treating each substrate with the water-based coating composition of the present invention is not particularly limited, and may be treated by spin coating, dip coating, roll coating, flow coating, spray coating, etc. You may process by the hand coating etc. which used the jig | tool. Thereafter, the coating film can be formed by naturally drying the alcohol used as a solvent, and post-treatment by heat drying is not necessary.

  Examples of the present invention will be specifically described below. In addition, this invention is not limited to a following example.

(Adjustment example 1)
In a flask equipped with stirring gas, a heating device, a reflux cooling device, and a dropping funnel, 136 g of methyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM13), 20 g of methanol and methyltrichlorosilane so that the hydrochloric acid concentration becomes 20 ppm. While charging and stirring, 10 g of water was gradually added dropwise through a dropping funnel. Then, the reaction was continued for 2 hours at a reflux temperature of about 70 ° C. to carry out a hydrolysis condensation reaction. After the reaction, unreacted water and the like were separated and a volatile solvent such as methanol was distilled off under reduced pressure to obtain 94 g of organopolysiloxane containing unreacted trimethoxysilane. The polymerization average molecular weight of the obtained organopolysiloxane was 3000. Then, 3 g of POE (15) cetyl ether which is a nonionic surfactant is added to 90 g of this organopolysiloxane which also contains unreacted trimethoxysilane and heated to about 40 ° C., and then a homomixer is used. Was stirred at 5000 rpm, and 93 g of warm water was gradually added thereto, followed by stirring at 40 to 45 ° C. for 30 minutes to obtain a 50% aqueous silicone emulsion (A-1).

Example 1
Silicone emulsion (A-1) 0.5% by weight, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM603) 0.1% by weight, water 99 A water-based paint composition consisting of 4% by weight was obtained.

(Example 2)
Silicone emulsion (A-1) 1% by weight, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM603) 0.1% by weight, water 98.9 A water-based coating composition consisting of% by weight was obtained.

(Example 3)
A water-based coating composition comprising 5% by weight of silicone emulsion (A-1), 0.05% by weight of 3-aminopropyltrimethoxysilane (trade name: KBM903, manufactured by Shin-Etsu Chemical Co., Ltd.) and 94.95% by weight of water Obtained.

Example 4
A water-based coating composition comprising 10% by weight of silicone emulsion (A-1), 0.05% by weight of 3-aminopropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM903), and 89.95% by weight of water. Obtained.

(Comparative Example 1)
A water-based coating composition comprising 2% by weight of the silicone emulsion (A-1) and 98% by weight of water was obtained.

(Comparative Example 2)
An aqueous coating composition comprising 4% by weight of dimethyl silicone (manufactured by Toray Dow Corning Co., Ltd., trade name: SM7036EX) and 96% by weight of water was obtained.

(Comparative Example 3)
A water-based coating composition comprising 4% by weight of amino-modified silicone (manufactured by Asahi Kasei Wacker, trade name: NP2611) and 96% by weight of water was obtained.

(Comparative Example 4)
A water-based coating composition comprising 2% by weight of silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-52-8005) and 98% by weight of water was obtained.

(Comparative Example 5)
Silane oligomer (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KR500) 1% by weight, titanium catalyst (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: D25) 0.03% by weight, isoparaffin (manufactured by ExxonMobil Co., Ltd., trade name: Isobar) G) A coating composition consisting of 98.97% by weight was obtained.

(Storage stability of the composition)
The state after leaving the water-based coating composition described in Examples 1 to 4 and the water-based coating composition described in Comparative Examples 1 to 5 in a 50 ° C. environment for 2 weeks was visually confirmed. The case where the generation of precipitates and gelation was not observed was evaluated as “good”, the case where the generation of precipitates and gelation was observed was evaluated as “poor”, and the composition having “good” was judged good.

(Creation of specimen)
After creating a painted plate by baking an automotive paint consisting of acrylic-melamine resin in a laminated form of base coat and top coat on a plated steel plate material for automobile body, this is polished with diatomaceous earth, The substrate was prepared by washing with water and air drying. The water-based paint composition described in Examples 1 to 4 and the water-based paint composition described in Comparative Examples 1 to 5 are processed on a substrate using a flannel cloth, and unevenness remains in another new cloth. Wiped up so that there was no. It was naturally dried and cured at room temperature for 1 day at room temperature to prepare a test piece with a coating film.

  Using the test pieces with these coating films, the gloss, water repellency and antifouling properties were evaluated, and the finish when the coating composition was wiped onto the substrate was also evaluated visually. Regarding the wiping finish, a sample in which unevenness did not occur visually after application to a base material was evaluated as “good”, and a material in which unevenness remained visually was evaluated as “poor”, and a composition having “good” was judged good.

The gloss was evaluated by measuring 60 ° gloss using a GLOSS METER manufactured by Nippon Denshoku Co., Ltd. at the initial time immediately after the preparation of the test piece and after 3 months of outdoor exposure.
Specifically, at the initial stage, the gloss at 60 ° was measured on the surface of the test piece, and the gloss increase rate was calculated based on the following general formula (3) using the gloss value of the base material before coating. .
Gloss increase rate (%) = (Gloss value after treatment−Gloss value before treatment) / Gloss value before treatment × 100 (3)
The gloss increase rate thus obtained was evaluated as ○ when the gloss increase rate was 15% or more, and △ when the gloss increase rate was less than 10% but less than 10%.

Moreover, when 3 months passed, the gloss at 60 ° was measured on the surface of the test piece, and the gloss retention ratio was calculated based on the following general formula (4) using the initial gloss value.
Gloss maintenance rate (%) = (Gloss value at initial stage−Gloss value after three months) / Gloss value at initial stage × 100 (4)
The gloss maintenance rate thus obtained was evaluated as ○ when the gloss maintenance rate was 95% or more and 100% or less, Δ when 90% or more and less than 95%, and × when less than 90%. It was judged.

For water repellency, the initial contact angle immediately after preparation of the test piece and when three months have passed after outdoor exposure, a drop master made by Kyowa Interface Science Co., Ltd. was used to determine the contact angle for water on the coating surface with the θ / 2 method. 5 points were measured and the average value was obtained. The contact angle thus obtained was evaluated as ◎ when the contact angle was 105 ° or more, ○ when 100% or more and less than 105%, Δ when 95% or more and less than 100%, and × when 95% or less. And the coating film which is (circle) was judged favorable.

The antifouling property was measured using a color difference meter (CR-410) manufactured by Konica Minolta Co., Ltd. at the initial time immediately after preparation of the test piece and after 3 months of outdoor exposure. From L, a, b ΔE (color difference) was calculated, and the degree of soiling for 3 months was evaluated based on the color difference indicating how much the color changed between the initial period and 3 months. A film having a ΔE (color difference) of less than 3 was evaluated as ◯, a film having a ΔE (color difference) of 3 or more and less than 4 was evaluated as Δ, and a film having a value of 4 or more was evaluated as ×.

  Table 1 shows a list of the water-based paint compositions and paint compositions obtained, and the results of physical properties evaluation of the coating films prepared from these compositions.

  As shown in Table 1, the aqueous coating compositions of Examples 1 to 4 are excellent in storage stability with no occurrence of precipitates or gelation, and the wiping finish when applied to a substrate is uniform and uniform. Could be applied. Moreover, in the coating film produced with the composition, a gloss which is clearly visible after the coating film was formed, and the gloss could be maintained even after being exposed outdoors for 3 months. And in water repellency, the initial water repellency becomes a contact angle exceeding 105 °, and the water repellency is exhibited, and even after exposure outdoors for 3 months, the contact angle exceeds 105 ° with little deterioration in water repellency. Maintained. As for the antifouling property, it was revealed that the test piece after being exposed outdoors for three months did not increase in color difference from the test piece at the initial stage, and it was hard to get dirty. On the other hand, the comparative example in which (A) the silicone emulsion and (B) the amino group-containing alkoxysilane represented by the general formula (2) are not blended together is glossy and water repellent after being exposed outdoors for 3 months. In at least one item of antifouling properties, there were items inferior to those of the examples, and it was not good because it did not reach a commercially available level.

  Thus, in the aqueous prescription in which (A) the silicone emulsion and (B) the amino group-containing alkoxysilane represented by the general formula (2) are blended together, (B) represented by the general formula (2) The amino group of the amino group-containing alkoxysilane hydrolyzes with the alkoxysilyl group and its own alkoxysilyl group contained in the (A) silicone emulsion, and also has a strong coating film because it is incorporated into the coating film. Since it can be formed, it was found that a coating film excellent in gloss, water repellency, and antifouling property can be produced.

Claims (3)

(A-1) an alkoxysilane represented by the following general formula (1);
Xn-Si- (OY) 4-n (1)
(Wherein X is an alkyl group having 1 to 18 carbon atoms, Y is an alkyl group having 1 to 4 carbon atoms, and n is an integer of 1 to 3)
(A-2) an organopolysiloxane that is a hydrolysis-condensation product of the alkoxysilane;
(A-3) a nonionic surfactant;
(A-4) (A) silicone emulsion containing water;
(B) an amino group-containing alkoxysilane represented by the following general formula (2);
Z-Si (-X) m- (OY) 3-m (2)
Wherein Z is an alkylamine chain having at least one amine selected from primary to tertiary, X is an alkyl group having 1 to 4 carbon atoms, Y is an alkyl group having 1 to 4 carbon atoms, and m is 0 to 2 Integer)
(C) A water-based coating composition containing water. The amino group-containing alkoxysilane is 3-aminopropylmethoxysilane, 3-aminopropylethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3- The water-based coating composition according to claim 1, which is at least one selected from aminopropyltrimethoxysilane and N-phenyl-3-aminopropyltrimethoxysilane. The water-based paint composition according to claim 1 or 2, wherein at least one organic solvent selected from hydrocarbon-based, aromatic-based, ester-based, alcohol-based, and ketone-based solvents is not blended.