JPH08231879A - Pigment composition - Google Patents

Abstract

PURPOSE: To provide a pigment composition having excellent rust preventive performance, by using slag as a rust preventive pigment. CONSTITUTION: This pigment composition comprises slag in an amount of 100 pts.wt. that contains an alkali group and has been produced in a refining process and zinc or a zinc compound in an amount of 1 to 50 pts.wt. in terms of zinc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pigment composition, and more particularly to a pigment composition using a slag containing an alkali group containing zinc or a zinc compound as an anticorrosive pigment.

[0002]

2. Description of the Related Art Lead-based pigments such as lead suboxide, lead tin, cyanamide lead or chromium-based pigments such as zinc chromate and strontium chromate are used as rust preventive pigments for paints. However, lead, hexavalent chromium, etc. have hygienic problems, and it is necessary to switch to safer materials in terms of health effects on humans, environmental pollution, and disposal of industrial waste.

On the other hand, a hygienic rust preventive pigment containing no heavy metal has been studied, but in many cases, a sufficient rust preventive effect cannot be obtained, and even if it is effective, it is expensive and economical. Difficult to use in terms of sex.

As a method for preventing iron from rusting, a method is known in which the surface of iron is kept alkaline and passivated. Further, iron is said to be in a stable state when a passivation layer of iron (II) hydroxide is formed in the pH range of 9 to 12.5.

A slag containing an alkali group (hereinafter referred to as an alkali group-containing slag) has a pH of 9 to 12.6, and a coating film containing the slag can keep the iron surface alkaline and exhibit rust prevention. It has been confirmed in Japanese Patent Application No. 5-223955 that the alkali group-containing slag has an anticorrosive effect.

On the other hand, slag discharged from a molten steel furnace during steel production is used for slag cement and the like, but the amount of discharge is so large that it must be disposed of as industrial waste.

Therefore, an object of the present invention is to provide a pigment composition having excellent rust preventive performance by using slag as a rust preventive pigment.

[0008]

According to the present invention, in order to further improve the rust-preventing property of slag, the surface of alkali group-containing slag particles is subjected to a specific treatment with zinc or a zinc compound, and the slag particles are treated with zinc or a zinc compound. By containing, the elution of the alkaline component of the slag is controlled, and the optimal elution of the alkaline component for rust prevention is obtained. Further, by appropriately suppressing the elution of the alkaline component, the rust preventive property is maintained for a long period of time.

That is, the present invention is characterized in that 1 to 50 parts by weight of zinc or a zinc compound is contained as zinc with respect to 100 parts by weight of the slag containing an alkali group produced in the refining process. Is.

Examples of the alkali group-containing slag include blast furnace slowly cooled slag, blast furnace granulated slag, blast furnace semiquenched slag, converter slag, and SUS slag.

In order to add zinc to the alkali group-containing slag, the alkali group-containing slag is immersed in a solution of zinc in an alkaline liquid such as ammonia, filtered, drained, and dried in a drying oven to remove water and ammonia. Evaporation components such as the above are evaporated to fix zinc to the surface of the alkali group-containing slag.

Examples of zinc and zinc compounds soluble in an alkaline solution are zinc, zinc dust, zinc oxide, zinc carbonate, zinc fluoride tetrahydrate, zinc hydroxide, zinc nitrate hexahydrate, zinc phosphinate and phosphoric acid. Examples include zinc tetrahydrate, zinc diphosphate, and zinc oxalate dihydrate.

The components of the alkaline liquid include ammonia, organic amine, sodium hydroxide, sodium carbonate and the like.

As the alkaline liquid, it is desirable that the alkaline liquid does not evaporate and remain except the zinc component by the heating and drying after the immersion treatment.

Further, zinc chloride, zinc chlorate tetrahydrate, zinc perchlorate hexahydrate, zinc bromide, zinc iodide, zinc sulfate, zinc thiocyanate, zinc acetate dihydrate, hexaacetic acid- Tetrazinc oxide, bis (2,4-pentanedionato) zinc (I
I) -hydrate, dimethyl zinc, diethyl zinc, etc., and zinc compounds soluble in an organic solvent such as water or ethanol can also be used.

In these cases, the zinc compound can be fixed on the surface of the slag particles by dissolving the zinc compound in water or an organic solvent, immersing the alkali group-containing slag in this solution, and drying by heating.

The amount of alkali group-containing slag treated with zinc or a zinc compound is 10
Zinc is 1 to 50 parts by weight with respect to 0 parts by weight.

When the amount is less than 1 part by weight, the effect of anticorrosion is small, and when the amount of zinc fixed is more than 50 parts by weight, the effect is not improved and the economy is lacking although the number of manufacturing steps is increased.

[0019]

【Example】

Example 1 (1) Single Layer Treatment with Alkaline Zinc Solution 67 parts by weight of water was put into a glass beaker, and 7.1 parts by weight of Zinc Hua No. 1 (produced by Sakai Chemical Co., Ltd.) was gradually added to the slurry while stirring. I made it.

Next, 13.5 parts by weight of 29% ammonia water was added and stirred until it became transparent to prepare a zinc ammonia solution.

To 100 parts by weight of zinc ammonia solution, 50 parts by weight of alkali group-containing slag (granulated blast furnace slag, Essent, Nippon Steel Chemical Co., Ltd.) was added, stirred, and filtered through No2 filter paper to obtain a residue of 150. It was heat-dried for 60 minutes in an electric hot air drying oven kept at ℃.

From the measurement of the slag weight before and after the treatment, the amount of zinc deposited was 4% by weight.

When the slag was crushed after drying, the average particle size was 23.2 μm.

(2) Two-layer treatment with zinc alkali solution Alkaline group-containing slag (granulated blast furnace slag, essence,
The Nippon Steel Chemical Co., Ltd. processed the slag after the drying of the method of (1) and before pulverization in the same manner as the second treatment.

The amount of zinc attached at this time was 8.3% by weight.

When the slag was crushed after drying, the average particle size was 23.6 μm.

(3) Three-layer treatment with alkaline zinc solution Alkaline group-containing slag (granulated blast furnace slag, essence,
Nippon Steel Chemical Co., Ltd. processed the slag after drying and crushing according to the method (2) for the third time by the same method.

The amount of zinc adhered at this time was 12.8% by weight.
Met.

When the slag was pulverized after drying, the average particle size was 23.9 μm. Comparative Example 1 (1) Untreated Alkaline group-containing slag (granulated blast furnace slag, essence,
Nippon Steel Chemical Co., Ltd. was used as it was without treatment.

The average particle size of this slag was 23.0 μm. (2) Single-layer treatment with silicic acid colloidal solution 100 parts by weight of ammonia-stabilized silicic acid colloidal solution (Snowtex N, manufactured by Nissan Kagaku Co., Ltd.) was added to alkali group-containing slag (granulated blast furnace slag, essence, 50 parts by weight of Nippon Steel Chemical Co., Ltd. was added, stirred, filtered with No2 filter paper, spread on an enameled batt, and dried by heating for 60 minutes in an electric hot air drying furnace kept at 150 ° C.

From the measurement of the slag weight before and after the treatment, the amount of silicic acid deposited was 10% by weight.

When the slag was crushed after drying, the average particle size was 23.2 μm. (3) Two-layer treatment with silicic acid colloidal solution Slag containing alkali groups (blast furnace granulated slag, essence,
Nippon Steel Chemical Co., Ltd. was treated by the method of Comparative Example 2, and then the second treatment was performed by the same method.

From the measurement of the slag weight before and after the treatment, the amount of silicic acid deposited was 18% by weight.

The average particle size after pulverization was 30.8 μm.

The slags of Examples 1, 2 and 3 and Comparative Examples 1, 2 and 3 were made into paints with the following compositions.

67 parts by weight of a 70% xylene solution of a bisphenol type epoxy resin having an epoxy equivalent of 450 to 500 (Epicoat 1001 × 70, manufactured by Yuka Shell Co., Ltd.) was used in Examples 1, 2, 3 and Comparative Example 1, 18 parts by weight of each of 2 and 3 slags, titanium dioxide (R5N manufactured by Sakai Chemical Co., Ltd.)
5 parts by weight, 6 parts by weight of xylene, and 4 parts by weight of isobutanol were added to make a total of 100 parts by weight.

It was dispersed by a glass bead paint shaker for 60 minutes.

A polyamidoamine-based curing agent (ADEKA HARDNER EH-306, 100 parts by weight of these dispersions) was used.
17 parts by weight of Asahi Denka Co., Ltd. and dedicated thinning solution (weight ratio xylene / isobutanol / MIBK = 60/20 /
20) Add 20 parts by weight and stir for 20 minutes.

After aging, a polished steel plate (SPCC-SB 0.8 ×, which was polished with # 320 abrasive paper and degreased twice with xylene.
70 × 150 mm) and spray dried, and dried at room temperature for 7 days to obtain a test piece. ○ Test item (1) Film thickness The film thickness of the test piece was measured with an electromagnetic film thickness meter. (2) Pencil scratch value: JIS K 5400 8.
Tested according to 4.2. (3) Eyelet adhesion: JIS K 5400 8.
Tested according to 5.2. (4) Salt water spray resistance test: JIS K 5400 9.1
The test was performed for 500 hours under the above conditions.

The test piece was tested with an NT cutter with a cross cut reaching the substrate.

The degree of corrosion was evaluated by the degree of rust generation from the cut portion.

The degree of rust generation was evaluated by the rust width from the cut.

×: Rust of 3 mm or more on one side Δ: Rust of 2 to 3 mm on one side ○: Rust of 2 mm or less on one side

[0044]

EFFECTS OF THE INVENTION By treating slag containing an alkali group with zinc or a zinc compound, the rust preventive performance can be improved and the slag can be effectively used as a rust preventive pigment.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazumi Daedoku, Inventor Kazumi, Tobata-ku, Kitakyushu, Kitakyushu, Japan No. 1-1 Tobata-cho, Nippon Steel Co., Ltd. 1043 Daito Paint Co., Ltd. (72) Inventor Mikitomo Ikeda 5-664 Akasaka, Kokurakita-ku, Kitakyushu, Fukuoka Daiki Industry Co., Ltd.

Claims (1)

[Claims] 1. A pigment composition comprising 1 to 50 parts by weight of zinc or a zinc compound as zinc based on 100 parts by weight of an alkali group-containing slag produced in a refining process.