JPS6013864A - Solvent-type paint - Google Patents

Abstract

PURPOSE:To provide a solvent-type paint free from the seeding tendency (agglomeration of pigment particles to form coarse particles), by treating the surface of precipitated calcium carbonate with a resin acid and a fatty acid, and using the treated calcium carbonate in combination with a zinc-based pigment. CONSTITUTION:The surface of precipitated calcium carbonate is treated with a resin acid (e.g. resin acid soap) and a fatty acid (e.g. a fatty acid soap). The objective solvent-type paint can be produced by using the surface-treated precipitated calcium carbonate together with a zinc-based pigment composed of zinc white, zinc powder, etc. The total amount of the fatty acid and resin acid is 1-10% based on 100pts.wt. of the precipitated calcium carbonate, and the amount of the resin acid is preferably >=15pts.wt. per 100pts.wt. of the fatty acid.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solvent-based paint comprising a zinc-based pigment and precipitated calcium carbonate.

Calcium carbonate treated with various organic substances has been widely used to improve the physical properties of solvent-based FFI paints. Among all the physical properties of paints, stiffness is the most important physical property, and is a factor that influences the workability of thick coatings and vertical coatings. Since calcium carbonate whose surface has been treated with fatty acids is very effective for improving K, it has been widely used in solvent-based paints.

However, the use of calcium carbonate whose surface has been treated with fatty acids has a major disadvantage in that seeding (pigment agglomeration resulting in bulges) occurs during storage of the paint. child. As a solution, there is Tokko Sho #-4t3/70, but this uses a combination of oxyfatty acids and fatty acids that do not have 10H groups, and seeding is not possible when oxyfatty acids are used. It's a preventive measure and not about fatty acids in general. Please note that oxyfatty acids are very expensive and it is almost impossible to use them as a surface treatment agent for calcium carbonate based on the market price of this type of calcium carbonate, but common fatty acids are cheap. It can be used cost-effectively as a surface treatment agent for calcium carbonate.

Regarding the chicken properties of paints, Japanese Patent Publication No. Sho U-413170 states that oxyfatty acids are superior to other fatty acids; Since it is possible to obtain sufficient chicken properties than oxyfatty acids even with common fatty acids, there is no reason to limit the surface treatment to oxyfatty acids. On the other hand, over the past few years, the paint industry has undergone major changes in terms of quality and construction.

Due to the recent rise in labor costs and the increase in painting costs due to the rise in the number of high-rise painting locations, there is a trend toward creating paints with as good weather resistance as possible and avoiding repainting or repainting9.

Large amounts of zinc dust (2N) and zinc white (znO) have come to be blended as pigments in formulas for making paints with good weather resistance. The zinc dust reacts with the fatty acids in the vehicle to form a durable P5 coating with metallic soaps, preventing the ingress of harmful gases. In addition, since zinc powder absorbs ultraviolet rays well, it can prevent the binder from aging. In addition, it is effective in preventing rust on iron materials because it has a greater tendency to ionize than iron, and the products of electrolytic action protect iron surfaces. When zinc white is added to oil-based paints, it dries well and hardens the paint film, is non-stick, and has excellent weather resistance as it absorbs ultraviolet rays well, even among white pigments. Teru.

Zinc dust and zinc white have the above-mentioned excellent properties, so they are widely used in paints, but when combined with calcium carbonate, or calcium carbonate whose surface has been treated with a fatty acid, seeding becomes extremely difficult. This is a major problem that can easily occur. In addition, special public F@'l! As specified in Table 2, in the Example of No. f3/7θ, it is stated that seeding does not occur due to surface treatment with oleic acid, but the Example formulation does not contain zinc dust or zinc white. In a system containing these, seeding occurs even if the surface is treated with oleic acid.

In addition, the fatty acids used for surface treatment to improve chicken properties are aggravating the cause of seeding in the presence of zinc pigments, but since both are indispensable, this problem can be solved. has become urgent. Therefore,
After examining various ready-made materials, we found that calcium carbonate, which has been treated with a combination of fatty acids and resin acids, which has traditionally been used as a sealant, is excellent at preventing seeding in solvent-based paints containing zinc-based pigments. It was found that it had a positive effect. What is sealing material?
As described in No. 173, it is used to maintain watertightness and airtightness of various joints or cracks, and to fix members with a certain degree of strength. Therefore, since it is in a highly viscous paste state during storage and application, it is completely unlikely that the pigments in it will migrate and coagulate with each other. In the case of wood, it's a good idea.

For this reason, this sealant has never been seen as effective in preventing seeding.

On the other hand, since paints are intended for rust prevention, concealment, etc., they are applied thinly to the object to be coated, so they are in a sufficiently fluid slurry state during storage and painting. Therefore, during storage, the pigment settles to the bottom of the container, with the result that the pigment aggregates with each other to form aggregates of around 1 ffI01 in size. This is called seeding. If a paint that has undergone seeding is applied as it is, aggregates will protrude on the paint film surface, resulting in problems such as the occurrence of rust and a reduction in the rust prevention effect, and the basic performance of the paint will not be achieved at all. Also, since paint is often coated many times,
This interface also poses a seeding problem. Specific 1
If a paint containing calcium carbonate, which has been surface-treated with a fatty acid alone, is applied on top of a paint containing a fluorine-based compound, pigment aggregates will form at the boundary, which will have a negative effect on the adhesion and weather resistance of the paint. . It is thought that this aggregate at the interface is due to the formation of fatty acid zinc.

In this way, it has been found that precipitated calcium carbonate, which has been surface-treated using a combination of resin acid and fatty acid, exhibits an excellent seeding effect when used as a solvent-based paint. The object of the present invention is to provide precipitated calcium carbonate treated in combination with the above as a solvent-based paint.

The ratio of the combined use is such that the resin acid is used in combination in t parts or more, preferably in parts by weight, based on the total amount of fatty acids. On the other hand, calcium carbonate to which the surface treatment method of the present invention can be applied must be fine and non-agglomerative. This is because, for example, materials such as heavy calcium carbonate, which are made by mechanically crushing limestone and have a particle size of /θμ or more,
Even fine precipitated calcium carbonate with a secondary particle size of 403 to 4Qμ has no dispersion formulation and has too strong agglomeration, even if the surface is treated with fatty acid, the desired chicken properties cannot be obtained, so dispersion is difficult. It is especially good to have a prescription in place. On the other hand, regarding the relationship between the tendency of seeding to occur and the particle size and cohesiveness of calcium carbonate, seeding is more likely to occur as calcium carbonate particles become finer and have less agglomeration. To improve this type of calcium carbonate, it is essential to surface-treat it with fatty acids. That is, the present invention is revolutionary in that seeding does not occur even if the surface of calcium carbonate, which tends to cause seeding, is treated with fatty acids.

The reason why seeding occurs when a fatty acid is used alone, but when a fatty acid and a resin acid are used together does not cause 7-day seeding, can be considered as follows. When the calcium carbonate surface is coated with fatty acids and resin acids, these acids are thought to form C& salts on the calcium carbonate light surface, forming strong chemical bonds. Furthermore, it is thought that the resin acid has a pigment dispersing effect when it is chemically bonded to the surface of calcium carbonate. In addition, when calcium carbonate surface-treated with these is combined with zinc white or zinc powder, 7 parts of the resin acid or fatty acid that forms C& salt on the surface of calcium carbonate becomes Zn salt, but the fatty acid zinc contains pigment. In contrast, zinc resinate has the effect of agglomerating pigments (as a result, a single-fatty acid product causes seeding), while zinc resinate has the effect of improving the dispersibility and wettability of pigments. Considering this, it can be explained that when resin acids are used in combination, seeding does not occur even when used in zinc-based formulations.

Examples are shown below.

Example 1 701 drops of precipitated calcium carbonate water with a primary particle size of 40 μm were prepared. The solid content of calcium carbonate in this slurry is 2 mm. To this, fatty acid soap, θt, and resin acid soap/Ot are each added as 10% aqueous solutions, stirred for 1 hour, dehydrated and dried, and passed through a pulverizer to obtain a sample. For comparison, using the same calcium carbonate tree, samples treated with fatty acid soap alone and samples treated with fatty acid soap and a small amount of resin acid soap were compared, and the physical properties of these samples were compared when they were mixed into the respective paints.

(1) Paint-blended alkyd resin (Dainippon Ink P-Hiro 2θ-70) 24
tθ is titanium oxide (Ishihara Sangyo R-Otsu W) Otsu! No. 1 zinc oxide 3! /! %naphthenic acid pb/4t 6% 7thenic acid C0 comineral spirit! ! Skin cut prevention agent Kusumoto Kasei Dice Baron-1-! 0/) /
Sample (calcium carbonate) 3.! From the results of the examples described below in the margins, it is clear that if the resin acid is used in combination with the fatty acid at a certain ratio or more, seeding will not occur even if the paint is stored. Also,
It can be seen that other paint physical properties are also better when treated with a resin acid.

Claims (1)

[Claims] (1) A solvent-based paint comprising a zinc pigment and precipitated calcium carbonate, characterized in that the precipitated calcium carbonate is surface-treated with a resin acid and a fatty acid. (2. In the product described in claim 1), the total amount of fatty acids and resin acids is /% to /θ% with respect to 700 parts by weight of precipitated calcium carbonate, and the total amount of fatty acids and resin acids is /% to /θ%, and On the other hand, resin acid is more than 1 part by weight in solvent-based paints.