JP2010084038A - Coating blend substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acrylic-urethane-based coating blend substance which improves various durabilities of a coating film applied on an inorganic substance such as a glass plate as well as transparency. <P>SOLUTION: The acrylic-urethane-based coating blend substance comprises an acrylic polyol, isocyanate, organic solvent and a coloring material. The coloring material includes a pigment having a particle diameter of 0.11-0.20 μm, in which a vinyl chloride-vinyl acetate copolymer is a dispersant. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coating composition, and more particularly to a coating composition excellent in various durability of a coating film applied to an inorganic substrate such as glass.

  Glass products such as glass cups, glass bottles, indoor interiors, glass products such as window glass, glass filters, signboards, various displays, and coating and coloring of automotive exterior materials have been conventionally used, for example, the glass frit method and laminated glass. There is a law. 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 to bake at a temperature of 500 ° C. or higher, which makes it difficult to perform secondary processing of the glass during cooling. There was a problem, and this made it difficult to apply to indoor interiors that required secondary processing such as cutting.

  In the laminated glass method, a laminated body having a five-layer structure is produced by sandwiching a polybutyral film with a colored polyester film sandwiched between glass plates. However, the structure and manufacturing process are complicated, and there is a problem of high cost.

On the other hand, in the organic resin method, as disclosed in Patent Document 1 and Patent Document 2, an organic resin such as an acrylic-melamine resin or an acrylic-urethane resin added with a pigment is screen-printed, sprayed, It is applied by a method such as brush coating, and heat-treated at a temperature of 300 ° C. or lower and baked on a glass substrate. 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 with the glass plate is insufficient and the durability such as acid resistance and alkali resistance is inferior. was there.
Japanese Patent Laid-Open No. 10-152632 Japanese Patent Laid-Open No. 11-012530

Therefore, in Patent Document 3, a trifunctional silicon alkoxide is added to the main agent composed of an acrylic polyol and an isocyanate in the acrylic-urethane coating composition composed of an acrylic polyol, an isocyanate, an organic solvent, and a colorant. It added so that the active ingredient might be 0.5-15 mass% with respect to solid content.
JP 2002-322414 A

  With this improvement, the obtained coating composition has excellent coating film hardness, and even when applied to a substrate made of an inorganic material such as a glass plate, a coating composition having various durability can be provided.

However, there has been a problem that the coating film becomes cloudy when these paint compositions are applied to a cover of a lighting device that requires transparency.

The present invention is for solving such problems, and it is an acrylic-urethane coating composition that improves various durability of a coating machine applied to an inorganic material such as a glass plate and also has improved transparency. The purpose is to provide.

  In order to achieve the above object, the present invention provides an acrylic-urethane coating composition comprising an acrylic polyol, an isocyanate, an organic solvent, and a colorant. It is in a coating composition containing a pigment having a particle size of 0.11 to 0.20 μm using a coalescence as a dispersing agent.

Invention of Claim 2 exists in the coating-material composition of Claim 1 in which the said coating-material composition contains fatty acid amide as a thixotropic agent.

  According to the first aspect of the present invention, in an acrylic-urethane coating composition comprising an acrylic polyol, an isocyanate, an organic solvent, and a colorant, the particle size of the colorant having a polyvinyl acetate copolymer as a dispersant. Is a coating composition containing a pigment of 0.11 to 0.20 μm, it can be made a coating composition with high transparency.

  According to invention of Claim 2, since the said coating composition is a coating composition of Claim 1 or 2 which contains fatty acid amide as a thixotropic agent, the sagging of a coating film can be prevented and it coats thickly. There is an effect that can be.

Embodiments of the present invention will be described below.
Acrylic polyol is generally used for paints and is applied to a substrate such as glass by spray printing, dipping, screening, coating, or the like. In the case of spray printing, the low-boiling solvent is mainly used, and the resin content is adjusted to be 10 to 50 parts by mass. Here, the low boiling point solvent may be a solvent such as xylene, butanol, butyl acetate, methyl isobutyl ketone, and the boiling point may be 80 ° C to 200 ° C. In the case of screen printing, a liquid acrylic polyol is mixed with a high boiling point organic solvent and distilled using a rotary evaporator or the like to volatilize the low boiling point solvent and replace the solvent with a high boiling point solvent. Here, the low boiling point solvent is toluene, xylene, acetone, butanol, butyl acetate or the like. The resin content after solvent replacement is adjusted to 30 to 80 parts by mass.

  The high-boiling organic solvent is a solvent having a boiling point of 150 to 250 ° C., and examples thereof include carbitol, dimethylformaldehyde, dimethylimidazolidinone, terpinol, and diacetone alcohol. When the solvent has a boiling point of less than 150 ° C., the coating composition of the present invention tends to clog the screen mesh during printing, and when the solvent exceeds 250 ° C., the solvent does not volatilize even by heat treatment.

  Polyisocyanates are also commonly used for paints, and highly stable blocked isocyanates are used in order to use them as one-part paints for screen printing. It is added at a mixing ratio of NCO / OH = 1/1 (equivalent ratio) with respect to the acrylic polyol. What added the said isocyanate to the said solvent substituted acrylic polyol is hereafter called a main ingredient.

  The coating composition of the present invention preferably contains a pigment having a particle size of 0.11 to 0.20 μm using a vinyl acetate vinyl copolymer as a dispersant as a colorant.

  As the pigment, a pigment having a particle size of 0.11 to 0.20 μm is preferably used. When the particle size is smaller than 0.11 μm, there is a problem that the dispersibility generally decreases. On the other hand, when it exceeds 0.20 μm, the transparency decreases when used as a paint.

Next, a method for performing spray printing using the coating composition of the present invention will be described.
The glass plate that becomes the printed circuit board is painted by spraying.
The glass plate of the printed circuit board is not particularly limited to alkali glass, quartz glass, float glass,
It is used according to the purpose such as tempered glass. In addition, for example, a translucent member such as a glass or resin lamp cover (lighting device cover) that covers the light source (lamp) of the lighting device is applied,
In order to color or coat the lamp cover, a coating film can be formed with the coating composition. The substrate is not limited to such a lamp cover. For example, various glass plates such as outer walls, tiles, signboards, instruction plates, stickers, window glass, displays, resin plates, metal plates, various glasses. Alternatively, a resin filter, an ultraviolet cut filter, etc., such as a watch, case, beads, etc. made of glass or resin, etc. are used as a base material. A coating film can be formed with such a coating composition.

  Following the application of the paint formulation, a heat treatment is performed. This is for polycondensation of the mixture of the main agent and silicon alkoxide, and is specifically carried out at an ambient temperature of 130 ° C. to 300 ° C. and a heating time of 1 to 60 minutes. If it is less than 130 ° C, the polycondensation reaction of the mixture of the main agent and silicon alkoxide does not proceed, and if it exceeds 300 ° C, the coating film turns yellow.

In the case of methods other than spray printing, such as screen printing, it may be necessary to replace the solvent with a solvent having a high boiling point.

Examples 1-5, Comparative Examples 1-5
According to Table 1, blocked isocyanate was added to the acrylic polyol to prepare a main agent. The solid content concentration of the main ingredient produced here was 61 mass%.

  The pigment was added while stirring the produced main agent, and finally fatty acid amide was added. Stirring was performed at about 500 rpm for 15 minutes or more. Immediately before spraying, the above blend, thinner and silicon alkoxide were mixed and stirred, and spray coating was performed. Since the fatty acid amide was added to the blend, no sagging occurred after painting. Sagging occurred when no fatty acid amide was added. The formulations of the examples are shown in Table 2.

  The prepared blend was applied on a glass plate, and the transparency of each pigment shown in Table 3 was evaluated. The measurement method was a dynamic light scattering method.

  In the comparative examples, pigments each having an average particle diameter exceeding 0.2 μm were used. And the turbidity per film thickness was measured by the method similar to an Example. The results are shown in Table 4.

  In the examples in which the average particle diameter is within 0.2 μm, the turbidity per film thickness is also 0.1% / μm or less, and the turbidity per film thickness in the comparative example in which the average particle diameter exceeds 0.2 μm. Is 0.6% / μm or more. Therefore, it can be seen that the transparency of the example is markedly higher than that of the comparative example.

Claims (2)

  In an acrylic-urethane coating composition comprising an acrylic polyol, an isocyanate, an organic solvent, and a colorant, the pigment is a pigment having a particle size of 0.11 to 0.20 μm using a polyvinyl acetate copolymer as a dispersant. A paint formulation characterized by comprising:   The coating composition according to claim 1 or 2, wherein the coating composition contains a fatty acid amide as a thixotropic agent.