JPH10298488A - Elastic coating composition having excellent stain resistance and elastic coating composition for finishing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic coating composition which can form an elastic coating film having excellent resistance to stain and water. SOLUTION: This composition comprises an acrylic synthetic resin emulsion having a glass transition temperature of -45 to +20 deg.C, a solvent-based synthetic resin varnish and a pigment, and has elasticity at a temperature ranging from a low temperature to room temperature. The acrylic synthetic resin emulsion and the solvent-based synthetic resin varnish are compounded in a way such that the ratio of the solids content of the former to that of the latter is 1.0:0.2 to 1.0, and the pigment is compounded in an amount of 5 to 500 pts.wt. relative to 100 pts.wt. of the total amount of the resins.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic coating material and an elastic coating material, and more particularly, to a coating material containing an acrylic synthetic resin emulsion and a solvent synthetic resin, and having excellent stain resistance in a low temperature to normal temperature range. , An elastic coating composition and an elastic finish coating material composition.

[0002]

2. Description of the Related Art In recent years, attention has been paid to the continuity of the aesthetics of buildings, and as a method of implementing this, in the field of paints, reduction of stains on painted films is being promoted.
Conventionally, as means for improving the stain resistance of an elastic paint, a method of imparting hydrophilicity to a coating film, a method of using a core-shell type emulsion or a cross-linked type emulsion, a method of adding an antistatic agent or a water repellent agent Are known, and a prescription combining them is generally employed.

[0003]

However, among the conventional means for improving the stain resistance of elastic paints, the method of imparting hydrophilicity is effective for low stain resistance, but tends to reduce water resistance. Further, core-shell type emulsions and cross-linked type emulsions have difficulty in designing emulsions and paints in terms of stain resistance, film forming properties, stability and the like. The method of adding an antistatic agent and a water repellent has a problem that long-term stain resistance cannot be expected. Therefore, the present inventor focused on the resin composition in the paint in the stain-resistant paint composition or the finish coating material composition, and as a result of intensive studies to solve the problems of the above means, as a result, "a specific acrylic synthetic resin A coating composition comprising an emulsion and a solvent-based synthetic resin varnish is excellent in stain resistance, excellent in water resistance, and also excellent in elasticity in a low temperature to normal temperature range. is there.

[0004] A first object of the present invention is to solve the inconvenience of the above-mentioned conventional means for improving the contamination resistance.
An object of the present invention is to provide an elastic coating composition which has low stainability of a coating film and can form an elastic coating film at low to normal temperatures.

It is a second object of the present invention to provide an elastic finish coating material composition which has a low level of contamination on the surface of the finish coating material and can form an elastic coated surface at low to normal temperatures.

[0006]

In order to solve the first problem, the elastic coating composition according to the first aspect is an acrylic coating composition having a glass transition temperature (hereinafter, also referred to as Tg) of -45 to + 20 ° C. Synthetic resin emulsion, glass transition temperature +0
A composition comprising a solvent-based synthetic resin varnish at + 50 ° C. and a pigment and having elasticity in a low-temperature to normal temperature range, wherein the acrylic-based synthetic resin emulsion and the solvent-based synthetic resin varnish are used as resin components in the composition. Resin solid content of 1.0
0.2 to 1.0 with respect to the total resin content.
It is characterized in that the pigment is blended in an amount of 5 to 500 parts by weight with respect to 0 parts by weight.

A second aspect of the present invention for solving the second problem.
The elastic finish coating material composition of (1) is characterized in that an aggregate of 300 parts by weight or less is added to 100 parts by weight of the elastic coating composition according to claim 1.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The resin components of the synthetic resin emulsion and the solvent-based synthetic resin varnish are generally those obtained by copolymerizing an acrylic monomer and styrene, and include fluorine, silicon, urethane, epoxy, ethylene, and acetic acid. Synthetic resins obtained by mixing or copolymerizing one or more resins from vinyl, vinyl chloride and the like can also be used.

[0009] The acrylic synthetic resin emulsion has a Tg of -45 to + 20 ° C. However, if an emulsion having a Tg lower than -45 ° C is used, the stain resistance is reduced and the Tg is increased by +2.
If an emulsion higher than 0 ° C. is used, the elongation performance is reduced. When the Tg of the solvent-based synthetic resin varnish is lower than + 0 ° C., the stain resistance decreases, and when the Tg is higher than + 50 ° C., the elongation performance decreases. In order to obtain better stain resistance, the acrylic synthetic resin emulsion has a Tg of -30 to +10.
C., Tg of the solvent-based synthetic resin varnish is preferably +10 to + 30.degree.

With respect to the solid content ratio of the acrylic synthetic resin emulsion and the solvent synthetic resin varnish, the ratio of the acrylic synthetic resin emulsion to the solvent synthetic resin varnish is 1.0:
If the amount of the solvent-based synthetic resin varnish is less than 0.2, improvement in stain resistance, adhesion, and film forming property cannot be expected. Also, 1.0
: If the amount of the solvent-based synthetic resin varnish is larger than 1.0, the stability of the coating composition is impaired.

In order to secure the opacity and the film thickness, the pigment
5 parts of the coloring pigment and extender pigment are added to 100 parts by weight of the resin.
To 500 parts by weight. Examples of pigments include titanium oxide, calcium carbonate, zinc white, carbon black, yellow iron oxide, red iron oxide, phthalocyanine blue, precipitated barium sulfate, clay, talc, silica stone powder, and diatomaceous earth. When the content of the coloring pigment and the extender is less than 5 parts by weight, the occlusion is poor, and occlusion occurs. If it exceeds 500 parts by weight, elongation performance and water resistance are reduced. The mixing ratio of the coloring pigment and the extender can be determined appropriately according to the use of the coating composition.

[0012] In the above-mentioned paint of the second aspect, the aggregate is mixed in an amount of 300 parts by weight or less with respect to 100 parts by weight of the paint of the first aspect. If the amount of the aggregate exceeds 300 parts by weight, the stain resistance and the elongation performance deteriorate. As the aggregate, silica sand, cold water stone and the like are generally used, but resin aggregates such as EVA powder and rubber powder can also be used. In addition, when finishing a design property favorably, it is desirable to mix 30-200 weight part of aggregates.

The elastic coating composition of claim 1 and claim 2
Elastic finishing coating compositions for general aqueous emulsion coating compositions such as dispersants, thickeners, antifreezing agents, film-forming aids, antiseptic / antifungal agents, antifoaming agents, or for finishing coating compositions Additives can be blended.

The elastic coating composition according to the first aspect and the elastic finish coating composition according to the second aspect can be obtained by using a brush, a roller, an air spray,
An elastic coating film excellent in stain resistance, water resistance and waterproofness can be formed by means of airless spray. The coating film of this elastic coating composition is hardly stained with respect to a normal elastic coating film due to the interaction between a soft acrylic synthetic resin emulsion and a relatively hard solvent-based synthetic resin varnish. Has moderate elasticity. And this coating film exhibits elasticity in a low temperature to normal temperature range.

According to the second aspect of the present invention, there is provided an elastic finish coating material composition comprising the elastic coating composition of the first aspect and an aggregate.
Although the physical properties of the painted surface differ depending on the amount of the aggregate added, it basically has the physical properties of the coating film of the first aspect.

The elastic coating composition or the elastic finish coating composition can be finished with excellent design. That is, the coated surface of the elastic coating composition can have a smooth finish, a rippled finish, an uneven finish, and the like. By spraying the coated surface of the elastic finish coating material composition together with the aggregate, an uneven finish such as ricin finish, jurac finish, and stucco finish can be achieved.

[0017]

Next, an embodiment according to the first aspect of the present invention will be described together with a comparative example. The number and percentage of each paint component
Indicates a weight ratio.

According to Table 1, the coating compositions of Example 1 and Comparative Examples 1, 2, and 3 in which the type of the synthetic resin emulsion was changed were prepared. The adjustment was performed by stirring and mixing each coating component (coating raw material) for each of Example 1 and Comparative Examples 1, 2, and 3.

[0019]

[Table 1]

The following paint components were used. Synthetic resin emulsion: General synthetic resin emulsion (Tg: −20 ° C., solid content 50%) Synthetic resin emulsion: Hydrophilic emulsion (Tg:
-5 ° C, solid content 50%) Synthetic resin emulsion: core-shell type emulsion (Tg: -5 ° C, solid content 50%) Solvent-based synthetic resin varnish: Acrylic resin varnish (Tg:
(15 ° C, solid content 50%) Color pigment: Titanium oxide powder Body pigment: Calcium carbonate powder

The coating film properties of each of the prepared coating compositions were examined for stain resistance, coating film elongation, initial water resistance, adhesion, film forming property, and drying property. The stain resistance was evaluated by performing an outdoor exposure test for 6 months and visually. The elongation of the coating is JIS6
909 elongation test. The initial water resistance was evaluated by immersing a coating film dried for 24 hours in water for 24 hours. Adhesion is
According to JIS A6909 adhesion strength test. The film forming property and the drying property were evaluated by immersing in water for 24 hours after drying in a -5 ° C environment.

Table 2 shows the test results of the above Examples and Comparative Examples.

[0023]

[Table 2]

In Table 2, the results of stain resistance, coating film elongation, initial water resistance, adhesion, film forming property and drying property are as follows: good
□, △, × → evil. As for the symbol, the closer to ○, the better, and the closer to ×, the worse.

As shown in Table 2, the coating composition of Example 1 showed good results in stain resistance, coating film elongation, initial water resistance, adhesion, film forming property, and drying property. The coating composition of Comparative Example 1 has stain resistance, initial water resistance, adhesion, film forming property,
The drying property was poor. The coating compositions of Comparative Examples 2 and 3 had good stain resistance, but were inferior in initial water resistance, adhesion, film forming properties, and drying properties.

Next, the coating compositions of Examples 2 and 3 and Comparative Examples 4, 5 and 6 in which the mixing ratio between the synthetic resin emulsion and the solvent-based resin varnish was changed were adjusted according to Table 3.

[0027]

[Table 3]

The above Examples 2, 3 and Comparative Examples 4, 5,
The physical properties of each coating composition of No. 6 were as shown in Table 4.

[Table 4]

As shown in Table 4, Examples 2 and 3
Was excellent in stain resistance, coating film elongation, initial water resistance, and film forming property. Comparative Example 4 in which the amount of solvent-based synthetic resin varnish was increased
Has lost the stability as a paint. In Comparative Examples 5 and 6 in which the amount of the solvent-based synthetic resin varnish was reduced, reductions in stain resistance, initial water resistance, adhesion, and film forming property were observed.

Next, an embodiment according to claim 2 of the present invention will be described together with a comparative example according to Table 5. As shown in Table 5, Examples 4, 5, and 6 and Comparative Example 7 are finish coating material compositions in which the amount of aggregate added was changed with respect to 100 parts by weight of the coating composition of Example 1.

[0031]

[Table 5]

The finish coating compositions of Examples 4, 5, 6 and Comparative Example 7 were sprayed on the test panel surface to test the physical properties of the finished surface.

The test results of Examples 4, 5, 6 and Comparative Example 7 are as shown in Table 9.

[0034]

[Table 6]

As shown in Table 6, Examples 4 and 5
In Example 6, the stain resistance and the elongation of the coating film were good. In Comparative Example 7, the stain resistance and the elongation of the coating film were reduced because the amount of aggregate was large. The design of the finished surface became jurac, ricin or stucco depending on the amount of aggregate added.

[0036]

According to the first aspect of the present invention, it is possible to form an elastic coating film excellent in stain resistance and in a low temperature to normal temperature range. According to the second aspect of the present invention, a finished surface excellent in stain resistance can be obtained. According to this finish coating material composition, a stucco-like finish can be obtained from a sand wall shape. This finished surface has elastic properties in a low temperature to normal temperature range.

Claims (2)

[Claims] An acrylic synthetic resin emulsion having a glass transition temperature of -45 to + 20 ° C, a glass transition temperature of +0.
Including a solvent-based synthetic resin varnish at ~ 50 ° C and a pigment,
A composition having elasticity in a low temperature to normal temperature range, and as a resin component in the composition, a resin solid content of the acrylic synthetic resin emulsion and the solvent synthetic resin varnish is 1.
0 to 0.2 to 1.0, and the total resin content is 1
A stain-resistant elastic coating composition comprising 5 to 500 parts by weight of a pigment per 100 parts by weight. 2. The elastic coating composition 100 according to claim 1.
A stain-resistant, elastic finish coating material composition comprising an aggregate in an amount of 300 parts by weight or less based on parts by weight.