JPH02105872A - Flat coating material - Google Patents

Abstract

PURPOSE:To obtain a flat coating material improved in a flatting effect by using a coloring agent formed by dyeing a starch, a wood flour and/or a pulp powder with a watersoluble dye and converting the obtained product into a pigment. CONSTITUTION:A starch, a wood flour and/or a pulp powder of a particle diameter <=80mum is mixed with 2-15% watersoluble dye and warm water to dye the powder and converting the obtained powder into a pigment to obtain a coloring agent. This agent is mixed with a plasticizer, a solvent, etc., to form a coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to paints, in particular matte paints, which use dyed starch, wood flour and powder of lumber or pulp as coloring agents.

[Prior Art J Conventionally, in the production of paints, various pigments have been used as coloring agents, and fillers have also been used as necessary. However, polyethylene-based and urea-based substances are often used as organic substances, and starch, wood flour, and
Or, those using pulp are not normally used except in very special cases. Among these fillers, silica-based substances in particular are spherical substances with a size of about 0.5 to 5p, and when used, they have an excellent matting effect and are useful as matte paints, but the physical properties of the painted surface are weak and they are easily damaged by friction. There are drawbacks such as the matte effect is lost in that area and some parts become glossy.

In addition, these fillers are cumbersome because they must be added each time the paint is manufactured, and it is also extremely difficult to obtain a homogeneous mixed state and maintain that state for a long time. There was a risk that they would separate soon.

[Problem to be Solved by the Invention 1] Therefore, the present inventor has developed a new method that can produce a paint that is more effective than conventional products even without using the filler described above, using an idea completely different from the conventional method. In an attempt to obtain a colorant (pigment), the present invention was developed as a result of intensive research.

[Means for Solving the Problems 1] That is, the paint of the present invention contains various starches of 80 microns or less, wood flour, and! Alternatively, it uses a coloring agent made by dyeing pulp powder with a water dye and turning it into a pigment, and it can be used alone to create a paint with a matte effect, and it can be used even without using fillers. It was possible to achieve an effect equal to or greater than that obtained when using this method.

The starches used in the production of colorants are usually rice starch, corn starch, potato starch, etc., but other starches such as tuber, sago, and arrowroot are also used. Starch particles themselves are oval and almost spherical, and are available in many varieties and are inexpensive, and are particularly preferred as materials for the present invention, but the particle size is about 3 to 80 microns, and rice starch has a particle size of 8 to 10 microns. , corn starch 10
-12 microns and potato starch 30-80 microns are often used.

In the case of wood flour and pulp powder, they are also ground and adjusted to a similar particle size using a sieve. Although these grain shapes are irregular and cannot be said to be spherical, there is no particular problem in obtaining a matte paint or the like.

Since these powders have OH groups, they can be easily dyed with water-soluble dyes to form pigments. As the dye, reactive dyes and direct dyes are preferred, and the resulting colorants and paints have good light resistance, and strong dyes generally exhibiting a value of 5 to 8 are often found. The amount of dye to be used is 2 to 15%, preferably around 5%, based on wood flour, etc. This coloring agent alone can provide a unique matte coating with vividness and depth unique to dyed products, but of course it is also possible to use a well-known matting filler in combination.

[Example 1 Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1 (1) Regarding rice and potato starch, Nippon Kayaku (reactive dyes manufactured by Kiki (Mikasion Yellow 4GS, Mikasion Orange GS, Mikasion Red GS and Mikasion Violet) R) was used in the following formulation. I made a coloring agent.

Rice starch 100g Sodium carbonate 7g Glauber's salt
5g reactive dye 6
g Hot water (40'C) 200c
Mix and stir the above components, treat at 40°C for 15 minutes, dehydrate, wash with water (3 times), dry, and crush.

(2) The colorant powder obtained in (1) was mixed with an acrylic resin liquid for paint according to the following formulation to make a paint (lacquer).

Acrylic resin (Mitsubishi Rayon LR-177) 17% Nitrified cotton R81/2 2% Plasticizer BBP 1% Colorant
10% additive
1% MEK 4
% Ethyl acetate 50% Butyl acetate 15% (3) The colorant powder of (1) was mixed with a paint resin liquid according to the following formulation to prepare a paint (urethane type).

Acrylic polyol resin (Dainippon Ink, Acrydic A30l-P) 28% Polyisocyanate (Dainippon Ink, Parnock DN950) 8% Colorant
30% additive
1% butyl acetate
5% ethyl acetate 17% doluol 11% (4) (2) above,
Table 1 shows the results of measuring the gloss at 60 degrees with a gloss needle (Macbeth gloss meter) for each colorant for the paint obtained in (3) spray painted on cardboard.

(1) For pulp powder, a coloring agent was prepared using the same dye as that used in Example 1 (1) according to the following recipe.

Pulp powder (40 o mesh) 100 g Sodium carbonate 10 g Glauber's salt
7g reactive dye
10g warm water (40°C)
A mixture of 600 cc or more is stirred and processed for 40'015 minutes, followed by dehydration, washing with water (3 times), drying, and pulverization.

(2) The colorant powder in (1) was made into a paint (lacquer) using the same formulation as in Example 1 (2).

(3) The colorant powder in (1) was made into a paint (urethane type) using the same formulation as in Example 1 (3).

(4) The paint obtained in (2) and (3) above was used in Example 1.
Table 1 shows the results of coating on cardboard using method (4) and measuring with a gloss meter.

Regarding the Oiseteiyu (1) wood flour, a coloring agent was made using the following recipe using direct dyes (black, red) manufactured by Udougaya ■.

Wood flour (300 mesh) 100 g Direct dye 15 g Water
Mix 700g or more and make 80
After stirring for 40 minutes, add 24 g of light bread and stirring for another 10 minutes, washing with water (twice), drying and crushing.

(2) The colorant powder in (1) was made into a paint (lacquer) using the same formulation as in Example 1 (2).

(3) The colorant powder in (1) was made into a paint (urethane type) using the same formulation as in Example 1 (3).

(4) The paint obtained in (2) and (3) above was used in Example 1.
Table 1 shows the results of coating on cardboard using method (4) and measuring with a gloss meter.

Comparative Example (1) Paint using the same formulation as in Example 1 (2) but only the colorant used for general paints Yellow = yellow lead 5G, orange nichrome vermilion, red = naphthol red, blue = phthaloshanin blue And so.

(2) Example 1 of the paint obtained in (1) for each pigment
The results of coating using method (4) and measuring with a gloss meter are shown in Table 1 for comparison.

In addition, when corn starch and wood flour are added as fillers to this paint, the reflectance for starch is 11.2 to 14.6%.
This will reduce the luster, but the wood powder will reflect $50.
The gloss did not decrease much between 1% and 61.2%.

[Effect of the invention J As can be seen from the results in Table 1 above, the reflectance of the paint using the colorant of the present invention is a much smaller value than that of the paint using a conventional pigment for comparison. The matte effect is excellent.

Moreover, it satisfies the needs of not only the use of relatively abundant resources such as starch and wood flour, but also the saving of dyes and fillers, as well as the simplification of work processes and cost reductions in paint manufacturing. Therefore, it can be said to be an extremely useful and promising technology.

Claims (1)

[Claims] (1) A paint made using a coloring agent made by dyeing various starches, wood flours and/or pulp powders of 80 microns or less with water-soluble dyes and turning them into pigments.