JPH01110567A - Rust preventing pigment composition - Google Patents

Abstract

PURPOSE:To obtain the above composition, consisting of aluminum phosphate prepared by treating surfaces of particles with a stearic acid based metallic soap, etc., and alkaline earth metallic compound, etc., and capable of exhibiting excellent rust preventing effects by using solvent based or oil coatings. CONSTITUTION:The aimed composition obtained by blending (A) aluminum phosphate or condensed aluminum phosphate prepared by treating surfaces of particles with a stearic acid based metallic soap (preferably aluminum stearate) with (B) an alkaline earth metallic compound and/or zinc compound, preferably at 1:0.4-1:0.8 ratio.

Description

[Detailed Description of the Invention] The present invention relates to a novel rust-preventing pigment composition, which can be used in general-purpose solvent-based paints and oil-based paints to exhibit excellent rust-preventing effects. This invention relates to a rust-preventive pigment composition that exhibits excellent rust prevention properties.

Rust-preventing pigments used in solvent-based paints and oil-based paints include:
Chromium-based pigments (e.g., zinc chromate, strontium chromate, etc.), lead-based pigments (e.g., red lead, lead chromate, lead cyanamide, etc.), phosphoric acid-based (zinc phosphate, calcium phosphate, etc.), molybdate-based (molybdic acid) Zinc, etc.), barium metaborate, etc. are known.

Chromium-based and lead-based antirust pigments contain harmful metals such as chromium and lead, which can be harmful to human health.

In addition, so-called non-polluting rust preventive pigments such as less toxic phosphoric acid-based, molybdic acid-based, barium metaborate, etc. have been developed in place of these pigments, but their rust preventive properties, especially in terms of durability, have been developed. The reality is that this is still insufficient and there is much room for improvement.

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The present inventors have made earnest efforts to develop a rust-preventing pigment composition that does not contain harmful metals such as hexavalent chromium and has excellent rust-preventing properties, and as a result, has achieved the present invention.

That is, the present invention provides a rust-preventing pigment composition comprising a pigment obtained by treating the surface of aluminum phosphate or condensed aluminum phosphate, which is sparingly soluble in water, with a stearic acid-based metal soap, and an alkaline earth metal compound and/or a zinc compound. relating to things.

To explain the content of the present invention in detail, the water-insoluble aluminum phosphate or condensed aluminum phosphate, which can be applied to the rust-preventing pigment composition of the present invention, is not particularly used, and is used as a rust-preventive pigment in various resin paints. It is acceptable as long as it can be accepted as such. Usually 10g/I as P2O5! Those having the following solubility are preferred.

Aluminum phosphate, for example, is
It can be produced by the method of No. 97, and a similar product can also be obtained by the liquid phase method, and is a substance exhibiting the structural formula MPOa. As the condensed aluminum phosphate, aluminum dihydrogen tripolyphosphate (for example, Japanese Patent No. 856.3
It can be produced by the method of No. 86, and has the formula A11! Substances showing H2P30 vagina and 2H20) and aluminum metaphosphate.

As crystal forms of aluminum metaphosphate, A type, B type, C type, D type, etc. are known. Aluminum metaphosphate is produced by, for example, reacting an aluminum compound and a phosphorus compound so that P/M=1.1 to 3, and
It is obtained by drying at 0 to 200°C, then firing at 250 to 450°C, further firing at 450 to 900°C, and pulverizing. It can also be produced by firing commercially available aluminum dihydrogen tripolyphosphate at 400 to 900°C, and is a substance having the characteristic formula Al2(PO3)3.

Compounds such as various carbonates, basic carbonates, borates, basic sulfates, basic phosphates, silicates, oxides, and hydroxides can be used as the alkali total compound.

The main purpose of treating the surface of aluminum phosphate or condensed aluminum phosphate with stearic acid-based metal soap is to provide the necessary corrosion protection for a long period of time by appropriately controlling the degree of elution of phosphate ions. It is in. That is, the water-repellent function of the stearic acid-based metal soap controls excessive dissolution of the rust-preventing pigment. Furthermore, surface modification of the rust-preventing pigment alleviates the interaction with the coloring agent and improves the stability of the paint. Stearate-based metal soaps include aluminum stearate, zinc stearate,
Examples include calcium stearate and magnesium stearate, with aluminum stearate being particularly preferred.

The surface of aluminum phosphate or condensed aluminum phosphate may be treated with stearic acid-based metal soap by simple dry mixing and pulverization, or by wet mixing reaction in water followed by dehydration and drying.

The mixing ratio of stearic acid-based metal soap-treated aluminum phosphate or condensed aluminum phosphate and the alkaline earth metal compound and/or zinc compound is 1:0.
It may be 1 to 1:1, preferably t:O, 4 to 1:
0.8 is good.

In the method of using stearic acid-based metal soap-treated aluminum phosphate or condensed aluminum phosphate in combination with an alkaline earth metal compound and/or zinc compound, it is possible to add them separately when forming a paint, or it is possible to add them separately in advance in a dry process. It is also possible to mix it in advance and use it when making a paint.

In the preparation of a paint from the anticorrosive pigment composition of the present invention, the color vehicle used may be any of those commonly used for antirust pigments, including boiling oil, oil-based varnish, alkyd resin, phenolic resin, and amino resin. .

Synthetic resin varnishes for various paints such as epoxy resins, urethane resins, vinyl resins, acrylic resins, fluororesins, silicone resins, and polyester resins, rubber derivatives such as chlorinated rubber and cyclized rubber, and other fiber conductors can be used alone or in combination. It can be used as

EXAMPLES In order to further explain the present invention, Examples are shown below, but it goes without saying that the present invention is not limited to these Examples. The percentages and parts in the examples are by weight.

Production Example 1 1000 parts of aluminum phosphate and 30 parts of aluminum stearate were mixed in advance, and this mixture was pulverized with a jet mill. This ground sample exhibited water repellency.

Further, 10 parts of this pulverized sample and 5 parts of zinc oxide were dry mixed to form a sample a.

Production Example 2 Commercially available aluminum dihydrogen tripolyphosphate (
Made by Teikoku Kako ■, Niichi Fresh #100P) 10
0 part was added, and the temperature was raised to 70±5°C. Next, 3 parts of sodium stearate and 3 parts of polyaluminum chloride were added, stirred at 70 ± 5°C for about 1 hour, passed through the mouth, dried the mature tree cake at 100°C overnight, and after pulverizing sample b. Obtained.

This sample exhibited water repellency.

Sample C was obtained by dry mixing 10 parts of sample and 7.5 parts of zinc chloride. In addition, sample cl.

and 6 parts of commercially available aluminum dihydrogen tripolyphosphate were mixed in a dry manner to obtain sample d.

Example 1 a) Air-drying medium oil alkyd paint 1) Resin 2) Rust-preventing pigment A. Sample b. Sample C. C. Sample d. 2. Zinc phosphate (rust-preventing pigment for comparison) 5.6 Precipitated barium sulfate 10. O talc SS
14.8 ocher 5
．． 6 Hesokozol 1334 EL (NV50%>4
0.0 (20,0) Disparon 501
0.3 Disparon 4200-20 1
．． 0・r syn -12,0 Total 100.0P/V =1.
8 Antirust pigment concentration 1% (in paint) 4) Painting method Bar coater coating film thickness 30 μm Board to be coated Degreased mild steel plate Drying conditions Room temperature 1 week 5) Test Salt water spray test 5% Na aqueous solution 35°C 168 hours 6) Good result ◎〉○〉〉X Defective b) Baking type epoxy resin 1) Resin 2) Rust preventive pigment A, Sample a B, Zinc phosphate (Rust preventive pigment for comparison) C, Zinc chromate ZPC (Rust preventive for comparison Pigment) 2. Barium metaborate (rust-preventing pigment for comparison) E. Zinc molybdate (rust-preventing pigment for comparison) 3) Rust-preventing pigment blended in paint 7.0 Titanium oxide 7.0 Talc SS
31.0 Epicote 1007 (
NV50%> 40.0 (20,0)
Total 105.6*Cellosolve acetate/xylene/MEK = 1/1/1 (weight ratio) P/B = 1.8 Rust preventive pigment concentration 10% (in paint) 4) Painting method Bar coater coating film thickness 30μm Covered Painted plate Degreased mild steel plate Drying conditions Baking 200℃ - 10 minutes 5) Test Salt water spray test 5% NaCl2 aqueous solution 35℃ 192 hours 6) Good result ◎〉Go to ○〉× As seen in the test results that are better than the effect of the defective invention Furthermore, the antirust pigment composition of the present invention exhibits excellent antirust properties. Therefore, by blending the present rust-preventing pigment into a paint spreading colorant, the life of the paint film can be extended, and the maintenance period can be extended.

Patent applicant: Teikoku Kako Co., Ltd. Agent: Patent attorney Taku Akaoka, N゛〒) ′□'lI! −′− Procedural Amendment Commissioner of the Patent Office September 3, 1988 1,
Display of the case Patent Application No. 268420 of 1988 2 Name of the invention Rust-preventing pigment composition 3 Person making the amendment Relationship to the case Patent applicant name Teikoku Kako Co., Ltd. 4, Agent 5, Date of amendment order - own
Issue 63 Number of inventions increased by amendment None 7, Contents of amendment subject to amendment 1, Detailed description of the invention, page 8, line 3, ``Zinc chloride'' is corrected to ``zinc oxide''.

2, page 9, line 11, rP/V = 1.8 Rust preventive pigment concentration 1% (in paint)", P/B = 1.8 Rust preventive pigment concentration 10% (in paint film)" Correct to.

3. On page 11, line 11, "(in paint)" is corrected to "(in paint film)".

Claims (5)

[Claims] (1) A rust-preventing pigment composition comprising aluminum phosphate or condensed aluminum phosphate whose particle surface has been treated with a stearic acid-based metal soap, and an alkaline earth metal compound and/or a zinc compound. (2) The anticorrosive pigment composition according to claim 1, which is formed by using aluminum phosphate and condensed aluminum phosphate together in any proportion. (3) The antirust pigment composition according to claim 1, wherein the stearic acid-based metal soap is aluminum stearate. (4) Claim 1 in which the zinc compound is zinc oxide
Rust-preventing pigment composition. (5) Claim No. 1 dispersed in a coloring material for paints
The antirust pigment composition according to any one of Items 1 to 4.