JP2003171615A - Coating material composition and method for preparing coating film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating composition excellent in long-term storage stability, and a method for preparing a coating film excellent in adherence and various durabilities. <P>SOLUTION: A principal component comprising a blend of an organic resin and a coloring agent is mixed under stirring with a curing aid comprising a blend of a trifunctional silicon alkoxide and a hydroxylated organic solvent in such a manner that the trifunctional silicon alkoxide as the effective constituent accounts for 0.5-20 mass% of the solids of the principal component, thus giving a coating material composition. The coating material composition is applied on the surface of an inorganic base material comprising e.g. a glass or a metal, dried and heat treated to prepare a coating film. If necessary, additives such as a silica powder, a ceramic powder, a metal powder, an ultraviolet absorber, a light stabilizer, an antioxidant, and an antifoaming agent can be added to the coating material composition. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a coating composition used for coloring an inorganic base material such as glass and metal, and a method for producing a coating film, and more specifically, to a coating composition having excellent storage and storage properties, adhesiveness and various properties. The present invention relates to a coating film manufacturing method having excellent durability.

[0002]

2. Description of the Related Art An inorganic base material such as glass or metal is arbitrarily colored with a colorant in order to impart a color change and a design property. For example, as a glass cup, a glass bottle, an interior, a glass product such as a window glass, a glass filter, a signboard, various displays, and the like, conventionally, for example, a glass frit method,
There is a laminated glass method. However, in the glass frit method, it is necessary to apply a colorant composed of glass frit, a pigment, and a binder to a glass substrate and bake it at a temperature of 500 ° C. or higher, which makes it difficult to perform secondary processing on the glass during cooling. However, this made it difficult to apply to interior interiors that require secondary processing such as cutting.

In the laminated glass method, a polybutyral film sandwiching a colored polyester film is sandwiched between glass plates to produce a laminate having a five-layer structure.
The structure and manufacturing process become complicated, and there is a problem of high cost.

Therefore, an organic resin method in which a pigment-added organic resin is applied to the surface of a glass plate by a method such as screen printing, spraying or brushing, and heat-treated at a temperature of 300 ° C. or less and baked on a glass substrate has attracted attention. There is. Since the baking temperature is 300 ° C. or lower, there is an advantage that the secondary processing of the glass plate is easy, but there is a problem that the adhesive strength between the glass plate and the intermediate film is low and the durability is poor. Therefore, in view of the above problems, a technique has been proposed in which a silane coupling agent (trifunctional silicon alkoxide) is added to a coating composition to improve the adhesiveness and durability of the coating film.

[0005]

However, the addition of trifunctional silicon alkoxides to the coating formulation improves the adhesion between the glass and the coating, while causing precipitation in the coating formulation over time. A problem has been pointed out. That is, since the trifunctional silicon alkoxide is highly reactive, the trifunctional silicon alkoxide becomes a precipitate by reacting with water in the coating composition or water in the air over time.
When colored using the paint formulation in which this precipitate formed,
There is a possibility that the adhesiveness and durability of the coating film may be reduced.

The present invention is intended to solve such problems, and is a coating composition excellent in storage stability, which is free from precipitates and deterioration in quality over time, and various durability, It is an object of the present invention to provide a method for producing a coating film having excellent adhesiveness.

[0007]

[Means for Solving the Problems] That is, the invention according to claim 1 of the present invention is a coating composition containing an organic resin, a colorant, a trifunctional silicon alkoxide, and an organic solvent, wherein the solvent contains a hydroxyl group. It is characterized by using an organic solvent. By selecting an organic solvent containing a hydroxyl group as the solvent in the coating composition, there is an effect that precipitates do not occur with time and storage stability is excellent for a long period of time. Although the reaction mechanism is unknown, it is considered that the use of an organic solvent containing a hydroxyl group as a solvent prevents the water and the trifunctional silicon alkoxide from reacting with time.

According to the second aspect of the present invention, there is provided a coating composition comprising a main agent containing an organic resin and a colorant, and a curing aid containing a trifunctional silicon alkoxide and an organic solvent containing a hydroxyl group. It is characterized by being a two-component coating composition comprising two components. A liquid organic resin is generally used as the organic resin blended in the coating material, and a solvent used for the liquid resin is generally an organic solvent having no hydroxyl group such as xylene and butyl acetate. At this time, even when a one-component coating composition is prepared by using an organic solvent containing a hydroxyl group as a diluting solvent, the trifunctional silicon alkoxide is not contained in the paint or in the air because the solvent in the liquid organic resin does not contain a hydroxyl group. Reacts with water over time to form a precipitate. Therefore,
A main component containing an organic resin and a colorant and a trifunctional silicon alkoxide are separated, and a trifunctional silicon alkoxide and an organic solvent containing a hydroxyl group are mixed as a curing aid to form a two-component coating composition. By doing so, long-term storage becomes possible.

The invention according to claim 3 of the present application is a method for producing a coating film, comprising a main agent containing an organic resin and a colorant, and a curing aid containing a trifunctional silicon alkoxide and an organic solvent containing a hydroxyl group. The trifunctional silicon alkoxide has an effective ingredient of 0.5 to 2 with respect to the solid content of the main agent.
It is characterized in that, after being blended so as to be 0% by mass, it is applied to the surface of the substrate, dried, and heat-treated. After the main component and the curing aid are blended so that the blending amount of the trifunctional silicon alkoxide falls within a specific range, the coating composition is applied, dried, and heat-treated, so that the appearance of the coating film is good, chemical resistance, and chemical resistance are high. A coating film excellent in boiling water can be produced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The coating composition of the present invention will be described in detail below. It should be noted that these are only embodiments and are not limited.

In the case of a coating composition containing an organic resin, a colorant, a trifunctional silicon alkoxide and an organic solvent as the coating composition in the present invention, an organic solvent containing a hydroxyl group is used as the solvent. It is also possible to prepare a two-component coating composition comprising a main agent containing an organic resin and a colorant, and a curing aid containing a trifunctional silicon alkoxide and an organic solvent containing a hydroxyl group. This is effective when an organic solvent having no hydroxyl group such as xylene, cyclohexanone, butyl acetate, acetone, methyl isobutyl ketone, solvent naphtha is used for the liquid organic resin.

As the organic resin, those generally used for paints can be used, and specific examples thereof include acrylic resin, alkyd resin, polyester resin, polyurethane resin, epoxy resin and melamine resin. Further, isocyanate-curable acrylic resin, isocyanate-curable polyester resin and the like also belong to the technical scope of the present invention. Among them, it is common to use an acrylic-melamine resin.

As the trifunctional silicon alkoxide,
γ-ureidopropyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltriethoxysilane, vinyltriethoxysilane, γ
-Methacryloxypropyltriethoxysilane, N-β
(Aminoethyl) γ-aminopropyltriethoxysilane, γ-chloropropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane and the like can be exemplified.

The organic solvent containing a hydroxyl group is, for example, an alcoholic organic solvent, specifically, methanol, ethanol, 1-propanol, 2-propanol, n-butanol, 2-butanol, ethylcarbitol, Butyl carbitol, diacetone alcohol, etc.

In the coating composition of the present invention, as a colorant,
Pigments or dyes such as organic dyes, inorganic pigments and fluorescent dyes are added, and if necessary, additives such as silica powder, ceramic powder, metal powder, ultraviolet absorber, light stabilizer, antioxidant, defoaming agent, etc. Can be added. In the case of a two-component coating composition, it is preferable to mix these compositions with the main component.

Then, these blends can be mixed and used as a paint blend. The trifunctional silicon alkoxide is preferably mixed in such a proportion that the active ingredient is 0.5 to 20 mass% with respect to the solid content of the organic resin. In the case of a two-component coating composition, the main component containing an organic resin and a colorant is separated from the curing aid containing a trifunctional silicon alkoxide and an organic solvent containing a hydroxyl group, and the mixture is separated into 3 parts at the time of use. The functional silicon alkoxide is mixed and stirred so that the active ingredient thereof is 0.5 to 20% by mass with respect to the solid content of the main ingredient. The trifunctional silicon alkoxide was added in an amount of 0.
If it is less than 5% by mass, the effects of chemical resistance and boiling water resistance are low, whereas if it exceeds 20% by mass, abnormal appearance such as loss of gloss of the coating film occurs.

As a method for applying the above-mentioned coating composition, a method such as screen printing, dipping, spraying, coating or the like is applied to a substrate such as glass. still,
It is desirable to appropriately adjust the viscosity of the coating composition according to these coating methods. Then, after drying the coating composition, a heat treatment is performed. This is for polycondensing the mixture of the above organic resin and silicon alkoxide, and is specifically carried out at an ambient temperature of 130 ° C to 250 ° C and a heating time of 1 to 60 minutes. When the temperature is lower than 130 ° C, the polycondensation reaction between the organic resin and the mixture of silicon alkoxide does not proceed, and when the temperature exceeds 250 ° C, the coating film turns yellow.

The material of the metal plate or glass plate which is the printed substrate is not particularly limited, and examples of the glass include alkali glass, quartz glass, float glass and tempered glass.
As the metal, aluminum, stainless steel, iron or the like is used according to the purpose.

[0019]

EXAMPLES Hereinafter, the coating composition of the present invention will be described in more detail based on examples. Examples 1 to 13 and Comparative Examples 1 to 7 90 g of the organic solvent shown in Tables 1 and 2 and 10 g of the silane coupling agent were blended, and the amount was 100 using a screw stirrer.
A stirrer was prepared by stirring at 0 rpm for 10 minutes. still,
Since 50% by mass of the silane coupling agent is diluted with methanol, the active ingredient (trifunctional silicon alkoxide) is 50% by mass of the compounding amount of the silane coupling agent. That is, the effective component (trifunctional silicon alkoxide) contained in the curing aid is 5% by mass.

[0020]

[Table 1]

[0021]

[Table 2]

After the curing auxiliary agent was stored at an ambient temperature of 40 ° C. for one month, the generation of precipitate was visually observed. The results are shown in Tables 1 and 2. In the comparative example, a precipitate was visually observed. As a result of infrared spectroscopic analysis and fluorescent X-ray analysis of this precipitate, it was confirmed that the precipitate was an active ingredient. On the other hand, in the examples, no generation of precipitates was observed, and it is understood that the storage and storage properties are excellent.

Further, the raw materials are blended according to the formulation of Table 3,
After stirring for 10 minutes at 1000 rpm using a screw stirrer, kneading was performed once using an ink roll to prepare a main agent. The solid content concentration of the organic resin in the main agent produced here is adjusted to 50% by mass.

A curing auxiliary agent stored for 1 month at an ambient temperature of 40 ° C. was mixed with the above-mentioned base material in a mass ratio of 1: 1,
A blue coating composition was obtained by stirring at 1000 rpm for 10 minutes using a screw stirrer. The ratio of the active ingredient to the solid content of the main agent is 10% by mass. After spray-coating the blue coating composition on flat glass, 150 °
A heat treatment was performed at C for 30 minutes to form a coating film on the glass substrate.

[0025]

[Table 3]

The following various tests were carried out for each sample,
The durability of the coating film was evaluated. The results are shown in Table 1.

(Acid resistance) The prepared sample was immersed in a 1N hydrochloric acid aqueous solution at 20 ° C. for 24 hours, and then the coating film was subjected to a cross-cut test (described in JIS K 5400) to check the degree of peeling of the coating film. Examined.

(Alkali resistance) The prepared sample was immersed in a 1N aqueous sodium hydroxide solution at 20 ° C for 24 hours, and then the coating film was subjected to a cross-cut test (described in JIS K 5400) to remove the coating film. I checked the degree.

(Water resistance to boiling) The prepared sample was immersed in boiling water for 3 hours, and then the coating film was subjected to a cross-cut test (JISK 5).
400) was carried out and the degree of peeling of the coating film was examined.

In the examples, boiling water resistance, alkali resistance,
It shows good results in all of the acid resistance, and it can be seen that the durability of the coating film is excellent even when a coating composition stored for a long period is used.

[0031]

As described above, the invention described in each claim of the present invention is a coating composition containing an organic resin, a colorant, a trifunctional silicon alkoxide, and an organic solvent, wherein the solvent contains a hydroxyl group. Coating composition using an organic solvent, and a two-component coating composition of a main agent containing an organic resin and a colorant, and a curing aid containing a trifunctional silicon alkoxide and an organic solvent containing a hydroxyl group. In the case of the formulation, the prepared coating formulation does not cause precipitation even when stored for a long period of time. Further, a main agent containing an organic resin and a coloring agent, a trifunctional silicon alkoxide, and a curing aid containing an organic solvent containing a hydroxyl group are added to the solid content of the main agent with respect to the solid content of the main agent. In a method for preparing a coating film in which the active ingredient is blended so as to be 0.5 to 20% by mass, and then coated, dried, and heat-treated on a substrate surface, the produced coating film is an inorganic substrate such as a glass plate. It was found that even when it was applied to, the effect of being excellent in adhesiveness and various durability was exhibited.

Claims (3)

[Claims] 1. A coating composition containing an organic resin, a colorant, a trifunctional silicon alkoxide, and an organic solvent,
A coating composition comprising an organic solvent containing a hydroxyl group as the solvent. 2. A coating composition comprising a base compound containing an organic resin and a colorant, and a trifunctional silicon alkoxide,
A coating composition characterized in that it is made into a two-component type curing agent containing a hydroxyl group-containing organic solvent. 3. In the method for producing a coating film, a main agent containing an organic resin and a colorant, a trifunctional silicon alkoxide, and a curing aid containing an organic solvent containing a hydroxyl group are added to the trifunctional silicone. A method for producing a coating film, which comprises blending an alkoxide such that an active ingredient thereof is 0.5 to 20% by mass with respect to a solid content of the base material, and then coating, drying and heat treating the surface of the substrate.