JPH1053728A - Water-based emulsion coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water-based emulsion coating material which can give a coating film nonproblematic in the exudation of staining substances from the wall surface without detriment to its storage stability by mixing a water- based emulsion coating material with a specified pigment component. SOLUTION: This material is obtained by mixing a water-based emulsion coating material with 1-200 pts.wt., per 100 pts.wt. emulsion resin of the coating material, at least one pigment component selected from among fraipontite represented by the formula: (Zn3-x Alx )(Si2-x Alx )O5 (OH)4 (wherein x is 0-1.75) and having a mean particle diameter of 0.5-20μm and a specific surface area of 20-300m<2> /g, active zinc white having a particle diameter of 0.2μm or below and a specific surface area of 50-150m<2> /g and magnesium silicate having a mean particle diameter of 1-20μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous emulsion paint suitable for painting indoors such as walls and ceilings contaminated with cigarette tar, soot, hand marks, and stains from rain leaks.

[0002]

2. Description of the Related Art Water-based emulsion paints are widely used as paints for coating new indoor walls and ceilings of buildings and vehicles from the viewpoints of sanitation, fire prevention, and resource saving. I have. However, when it is time to repaint, the walls and ceilings of the interior are usually contaminated with cigarettes, soot, grease, and stains from rain leaks. Often, the material seeps onto the repainted coating surface and detracts from aesthetics. In particular, pollutants such as cigarette tar and soot have a large amount of water-soluble components, and when an aqueous emulsion paint is used as a repaint, there is a noticeable bleeding phenomenon, which is aesthetically problematic. For this reason, the actual situation is that an organic solvent-based paint which has a problem in terms of environmental health of the coating work, fire prevention or resource saving is used as a replacement paint. Therefore, research and development of an aqueous emulsion paint which is unlikely to cause bleeding are being promoted, and a method of blending activated alumina or activated clay with the aqueous emulsion paint is known as one means of this. However, when activated alumina or activated clay is blended, a coating film in which the bleeding phenomenon of contaminants does not easily occur is obtained, but the coating material is easily gelled, and there is a problem in storage stability.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a coating film which does not exude the aforementioned contaminants without deteriorating storage stability. It is an object to provide an aqueous emulsion paint that can be formed.

[0004]

The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, it has been found that the addition of a specific pigment to an aqueous emulsion paint adversely affects the storage stability. Without, cigarette tar, soot, scale,
The inventors have found that it is possible to form a coating film without exudation of contaminants such as stains caused by rain leakage, and completed the present invention. That is, the present invention provides an aqueous emulsion paint comprising at least one selected from the group consisting of frypontite, activated zinc white and magnesium silicate as a pigment component.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The aqueous emulsion paint of the present invention is a paint containing, as essential components, a resin emulsion and at least one selected from the group consisting of frypontite, activated zinc white and magnesium silicate as a pigment component. Emulsion resins include vinyl acetate, vinyl acetate-acryl, ethylene-vinyl acetate, acryl-styrene, acrylic, epoxy, alkyd, acrylic-
Various emulsion resins conventionally used, such as alkyds, can be used without any particular limitation, and the ionicity of the resin is also anionic, cationic, nonionic, anionic-nonionic, cationic-nonionic, anionic-cationic. And various emulsion resins can be used. Further, the emulsion resin is a carbonyl group-containing resin, a hydrazine compound having a hydrazine residue, a hydrazide compound having a hydrazide group or a self-crosslinking type of a combination of a hydrazone compound having a hydrazone residue, and a non-crosslinking type. Various drying (curing) of things
Types are available.

[0006] The frypontite as a pigment component is
Typically, the following basic chemical structural formula: (Zn _3-x Al _x ) (Si _2-x Al _x ) O ₅ (OH) ₄ [x is from 0 to 1.75, preferably from 0.3 to 1.0. ]
And the composition ratio expressed as oxide is SiO ₂ 5-4
5 mol%, having a ZnO 35 to 65 mole% and Al ₂ O ₃ 0 to 60 mol% of fine laminated platelets, average particle size of about 0.5
Particles having a specific surface area of about 20 to 300 m ² / g. Regarding such fly pontites, Japanese Patent Publication No. 4-51485, Japanese Patent Publication No. 5-44405, and Japanese Patent Publication No.
-44406 and the like. As commercial products, “Mizukanite HP”, “Mizukanite A”
P "(all manufactured by Mizusawa Chemical Industry Co., Ltd. trade name) has _{such, 5ZnO · Al 2 O 3 ·} 3 SiO 2 · 5H 2 O / 4Si as an example of the composition
There is O _2. The activated zinc white as a pigment component is a particle having a small particle size of 0.2 μm or less and a specific surface area of about 50 to 150 m ² / g as compared with ordinary zinc white. As a commercially available product, "Activated Zinc Flower Azo" (trade name, manufactured by Shodo Chemical Co., Ltd.)
Etc.

The magnesium silicate as a pigment component is
Typically the chemical structural formula: 2MgO · 6SiO ₂ · XH hydrous magnesium silicate represented by ₂ O and the like, the average particle size of about 1~20μ
m particles. As a commercial product, "Kyoword 60
"0" (trade name, manufactured by Kyowa Chemical Industry Co., Ltd.), "Aid Plus"
(Trade name, manufactured by Mizusawa Chemical Industry Co., Ltd.). The mechanism by which these pigments are mixed to prevent the exudation of contaminants such as tobacco tar, soot, hand marks, and stains from rain leaks is not clear, but it was probably dissolved in the paint film by the paint solvent (water). It is considered that the contaminants are prevented from seeping out to the surface of the coating film by adsorbing the fly ponite, activated zinc white or magnesium silicate. In addition, frypontite, activated zinc white, other pigments having the same adsorptivity as magnesium silicate and powders containing elements such as Al, Mg, and Si, specifically, alumina, activated alumina, alum, silicon dioxide, Silicon oxide, activated clay, acid clay, magnesium hydroxide, magnesium oxide, white carbon, diatomaceous earth, talc, clay, kaolin, mica, etc. The effect of preventing seepage is small,
None of them were satisfactory.

The compounding amount of at least one pigment selected from the group consisting of frypontite, activated zinc white and magnesium silicate is 1 to 200 parts by weight based on 100 parts by weight of an emulsion resin (solid content) as a binder. And preferably 5 to 100 parts by weight. If the compounding amount is less than the above range, the effect of preventing seepage is not sufficiently exhibited, and if it is too large, the storage stability and the performance of various coating films tend to decrease. The aqueous emulsion paint of the present invention comprises the resin emulsion and the pigment component described above,
If necessary, further general pigments such as titanium oxide,
Vengara, carbon black, phthalocyanine blue,
Various coloring pigments such as phthalocyanine green, various extender pigments such as calcium carbonate, barium carbonate, talc, clay, mica, silica, glass balloon, shirasu balloon, various hydrophilic organic solvents such as methanol, ethanol, methyl cellosolve, ethylene glycol, It is composed of various additives such as a neutralizing agent, a thickening agent, an antifoaming agent, a film-forming aid, a preservative, a fungicide, an antibacterial agent, an antifreezing agent, and an ultraviolet absorber. In the case where other general pigments are blended, the volume concentration (PVC) of the total pigment including frying ponite, activated zinc white or magnesium silicate to the solid content of the paint is 70%.
%, Preferably in the range of 10 to 60%.

[0009] When the PVC content exceeds 70%, not only the physical and chemical performances of the resulting coating film are reduced, but also the compactness is reduced, and as a result, the effect of preventing oozing tends to be reduced. The aqueous emulsion paint of the present invention, with or without a primer on the surface of the substrate, brush, spray,
A coating film free of contaminants is formed by coating with a coating means such as a roller and drying naturally or forcibly.

[0010]

(Composition)

Isobutyl acrylate 310 parts Methyl acrylate 200 parts Styrene 123 parts Acrylic acid 12.3 parts Deionized water 341 parts Anionic surfactant * 1 53.5 parts (Newcol 707SF) Ammonium persulfate 1.1 parts 30 minutes from the end of dropping After the passage, ammonium persulfate 0.
A solution of 6 parts in 6 parts of deionized water was added dropwise over 30 minutes and held for another 2 hours. Then, after cooling to 40 ° C., aqueous ammonia was added to adjust the pH to 8.5, thereby preparing a non-crosslinked resin emulsion I having a solid content of 50.4%.

<Preparation of Crosslinked Type Resin Emulsion II>
In a four-necked flask, 232 parts of deionized water and 2.3 parts of an anionic surfactant "Newcol 707SF" are added, and after replacement with nitrogen gas, the mixture is heated to 80.degree.
7 parts were added, and a pre-emulsion having the following composition was further added dropwise over 2.5 hours. [Composition] Methyl methacrylate 260 parts n-butyl acrylate 150 parts 2-ethylhexyl acrylate 100 parts Styrene 97 parts Diacetone acrylamide 32 parts Acrylic acid 3.2 parts Deionized water 338 parts Anionic surfactant Note 1) 62 parts ( Newcol 707SF) 1.2 parts of ammonium persulfate After a lapse of 30 minutes from the end of the dropwise addition, a solution of 0.6 part of ammonium persulfate in 6 parts of deionized water was added dropwise over 30 minutes, and the mixture was held for another 2 hours. Then, after cooling to 40 ° C., a solution of 5 parts of adipic dihydrazide dissolved in 30 parts of deionized water was added, and ammonia water was further added to pH 8.5.
And a crosslinked resin emulsion II having a solid content of 50.2% was prepared.

<Preparation of Pigment Pastes AG> Table 1 below
Were sufficiently stirred to prepare pigment paces A to G.

[0013]

[Table 1] Table 1 (Unit: parts) Type of pigment paste ABC DEF G frypontite Note 2) 5 10 2.5 Active zinc white Note 3) 5 2.5 Magnesium silicate Note 4) 5 Active alumina Note 5) 5 Titanium oxide 20 20 20 20 20 20 20 Calcium carbonate 30 30 30 30 30 30 30 Kaolin clay 5 Water 9 9 9 9 9 9 9 Ethylene glycol 4 4 4 4 4 4 4 Pigment dispersant 1 1 1 1 1 1 1 Defoamer 1 1 1 1 1 1 1 Thickener 1 1 1 1 1 1 1 Note 2) "Mizukanite HP" (trade name, manufactured by Mizusawa Chemical Industry Co., Ltd.) Note 3) "Activated zinc flower Azo" (Seido Chemical Industries, Ltd.) Note 4) "Kyoward 600" (product name of Kyowa Chemical Industry Co., Ltd.) Note 5) "Activated alumina DN-1A" (product name of Mizusawa Chemical Industry Co., Ltd.)

[0014]

Examples 1 to 7 and Comparative Examples 1 and 2 A resin emulsion and a pigment paste were sufficiently stirred and mixed at the ratios shown in Table 2 below to prepare coatings. The obtained paint was tested by the following method to evaluate its performance. The results are shown in the lower part of Table 2. Note 6) Storage stability test The paint was placed in a beaker and allowed to stand at room temperature for 14 days to examine the paint condition. ：: Little change in viscosity and no gelation. ×: Significant change in viscosity or gelation. Note 7) Stain resistance test 150 × 70 × 4 mm flexible plate (JIS A54)
03 compatible product) with a commercially available acrylic resin-based white emulsion paint (a paint obtained by diluting “Aclose 100V” (trade name, manufactured by Dainippon Paint Co., Ltd.) with 10% water) with a brush twice, at 20 ° C. and 65% RH. Was dried for 1 week under the conditions described above to prepare a coated plate having a dry coating amount of about 100 g / m ² .

[0015] A cigarette extract (50 parts of dried tobacco leaves, 500 parts of tap water,
Three types of paint: a liquid painted with a water-based marking pen (JIS6037 compliant product), and a liquid painted with an oil-based marking pen. A test plate was prepared. After diluting each paint with tap water so as to have a viscosity (75 ± 2) KU [20 ° C.], brush each test plate,
It was air-dried for 2 days to form a coating film having a dry coating amount of about 50 g / m ² . The state of the surface of each of the obtained coating films was examined. ：: No exudation of contaminants Δ: Exudation of contaminants is considerably recognized. ×: Seepage of contaminants was observed over the entire surface, and discoloration was remarkable.

[0016]

TABLE 2 implementation Example Comparative Example 1 2 3 4 5 6 7 1 2 resin emulsion type II I II II II I / II II II II amount (parts) 40 40 40 40 40 10/30 40 40 40 Pigment Paste type A A B C D A E F G Amount (parts) 71 71 76 71 71 71 71 71 71 PVC (%) 48 48 53 48 48 48 48 48 48 Storage stability Note 6) ○ ○ ○ ○ ○ ○ ○ ○ × Stain resistance Note 7) Tobacco extract ○ ○ ○ ○ ○ ○ ○ × ○ Aqueous marking pen ○ ○ ○ ○ ○ ○ ○ × ○ Aqueous marking pen ○ ○ ○ ○ ○ ○ ○ ○ ○ Test in Table 2 above As is clear from the results, Examples 1 to 7, which are emulsion paints of the present invention, had excellent storage stability and stain resistance.

On the other hand, Comparative Example 1, which did not contain Freypontite, activated zinc white or magnesium silicate, was poor in stain resistance. In Comparative Example 2 containing activated alumina, the stain stopping property was slightly good, but the storage stability was poor.

[0018]

The water-based emulsion paint of the present invention can form a coating film without exuding contaminants such as cigarette tar, soot, dirt, and stains from rain without adversely affecting the storage stability. Therefore, it can be suitably used as a repaint for indoors which is contaminated with these contaminants.

Claims (2)

[Claims] 1. An aqueous emulsion paint comprising, as a pigment, at least one selected from the group consisting of frypontite, activated zinc white and magnesium silicate. 2. At least one selected from the group consisting of frypontite, activated zinc white and magnesium silicate is used in an amount of 1 to 2 per 100 parts by weight of the emulsion resin in the paint.
The aqueous emulsion paint according to claim 1, which contains 00 parts by weight.