JPS6012377B2 - Organic solvent type flake metal pigment composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel flaky metal pigment composition that is significantly improved in terms of image clarity and corrosion resistance.

Flake-like metal pigments produced by crushing metal powder have been used for various coating applications, but these conventional products have poor acidity, exhibiting a muddy color tone when used in coatings, and are not very bright. It is difficult to say that it is necessarily sufficient for coating applications that require good image quality. In addition, these subordinate metal pigments are insufficient in terms of corrosion resistance, so moisture,
It also has the disadvantage that its particle surface is easily contaminated by corrosive components in the atmosphere such as sulfur dioxide gas, and its characteristic metallic luster is impaired. Furthermore, especially when these metal pigments are used as water-based paint components, corrosion progresses as the metal particles gradually react with water in the aqueous medium and generate hydrogen gas, resulting in a significant decrease in metallic luster due to various reasons. It was difficult to avoid this problem even by adding corrosion inhibitors.
The present inventors have solved the above-mentioned difficulties of the prior art.As a result of intensive research, the present inventors have found that a dimer, which is a dimer of unsaturated higher fats (monenoic acid, digenic acid, and trienoic acid) with a carbon number of la
The present invention was achieved based on the finding that adding and mixing a predetermined amount of acid is extremely effective in improving the image clarity and corrosion resistance of flaky metal pigments.

Here, any method of adding and mixing dimer acid to the flaky metal pigment can be adopted, such as addition and mixing to conventional products or semi-finished products, but in terms of industrial production, the manufacturing method of the flaky metal pigment It is advantageous to add and mix in the dimer acid at some stage during each step of the dry or wet process known as .

Therefore, the structure and effects of the present invention will be explained in more detail below with reference to typical production examples that are advantageous for industrial production of the composition of the present invention. The most common work steps for dry or wet production of flaky metal pigments are summarized as follows. Dry method 1 Raw metal powder such as atomized powder or shredded foil powder is processed in a ball mill, stamp mill, vibration mill, attritor, etc. in the presence of a grinding aid such as saturated or unsaturated higher fatty acids, and other various additives if necessary. The resulting mixture, which is mainly composed of flaky metal powder, is then divided into dry flaky metal pigment products.

In this case, other additives such as a corrosion inhibitor, a leveling agent, a thickener, a leafing stabilizer, etc. may be further added to the mixture after the subtraction and kneaded. 2 To the mixture obtained by pulverization in the same manner as in 1, add a medium liquid consisting of mineral spirit, various hydrocarbon solvents such as solvent naphtha, or other solvents to make a metal paste, and process it in the same machine as 1 below. A paste-like flake metal pigment product is produced.

Wet method raw metal powder is pulverized in a pulverizer in the presence of a pulverizing medium such as a pulverizing aid, an aliphatic or aromatic hydrocarbon solvent, and other various additives as required, and then the same medium as the pulverizing medium is used. The flaky metal powder mixture is taken out from the pulverizer using liquid, divided under wet conditions, solid-liquid separated using a filter press, etc. to form a filter cake with a solid content of about 70 to 80%, and the medium liquid is added and kneaded to obtain the desired solid content (
It is usually a paste-like flake-like metal pigment product having a pigment content of about 65%).

In addition, in this kneading process, depending on the purpose, various additives such as corrosion inhibitors, leveling agents, thickeners, leafing stabilizers, etc. may be added and kneaded, or other grades of metal pigments may be added to control the color tone. Addition of and kneading are carried out. The compositions of the invention are advantageously prepared by adding the dimer acid at any stage during each step of the dry or wet process summarized above.

That is, according to the second invention, since dimer acid has a sufficient function as a grinding aid, it can be used as a grinding agent alone or as a grinding agent mixed with conventional aids such as various higher fatty acids. It is possible. Alternatively, the raw metal powder may be pulverized using a secondary pulverizing aid, and the 3 dimer acid may be added and kneaded to the pulverized product, or a predetermined amount of dimer acid may be added in portions to both the pulverizing process and the kneading process. It's okay. On the other hand, the dimer acid used in the present invention is a 3-dimer of unsaturated higher fatty acids with 12 carbon atoms (monenoic acid, dinic acid, and trienoic acid) as described above. In addition to -acids, it can be used in the form of fatty acid mixtures containing trimer acids and monomer acids.Typical examples include dimer acids derived from C18 oleic acid and linoleic acid. These are commercially available as fatty acid mixtures with a dimer acid content of 70% to 70% (Versadim: Japan Mineral Mills, Empol: Emery, etc.). Further, the amount of dimer acid in the composition of the present invention is selected within the range of 0.81/true specific gravity of metal to 81/true specific gravity of metal (parts by weight) with respect to 100 (parts by weight) of metal particles. If this lower limit value is satisfied, the improvement effect of image clarity and corrosion resistance is insufficient; on the other hand,
If the upper limit is exceeded, the strength of the applied film will be impaired.

The composition of the present invention does not prevent the coexistence of any substances included in conventional flaky metal pigment compositions, such as grinding aids, grinding media, liquid media, and various additives. However, some of these and other conditions advantageous in carrying out the present invention are summarized and exemplified below. 1
Atomized powder and shredded foil powder made of raw metal powder AI, Cu, Ni, Zn, Fe and their alloys such as Cu-Zn alloy and stainless steel.

2 Grinding media or medium liquid Other conventional grinding media other than aliphatic hydrocarbon solvents such as mineral spirits, aromatic hydrocarbon solvents such as solvent naphtha, and dish water.

3 Grinding aids Saturated or unsaturated higher fatty acids having 8 or more carbon atoms, their esters, amides, alcohols, etc. More specifically, the following can be exemplified: oleic acid, stearic acid,
Behenic acid, palmitic acid, myristic acid, lauric acid, linoleic acid, isostearic acid; butyl stearate, methyl oleate, stearamide, oleic acid amide, stearyl alcohol and oleyl alcohol.

4. Other additives Corrosion inhibitors for penzotriazole: Plastering agents such as silicone and fluorosurfactants; Thickeners and leafing stabilizers such as montmorillonite.

The composition of the present invention obtained as described above is immediately useful as a pigment for organic solvent-based (oil-based) paints.

Although the present invention has been described above by illustrating typical embodiments, the present invention is not limited to these in any way, and includes raw metal powder, grinding media or liquid media, grinding aids, and various additives. Other desired materials may be selected and used as desired.

The remarkable effects of the present invention can be more clearly understood from the following non-limiting examples and comparative test examples.

Example 1 Atomized aluminum powder (A manufactured by Toyo Aluminum Co., Ltd.)
AIOI) 1.0k9 mineral spirit and 1.25% dimer acid (Empoll 022 manufactured by Emery) 50 ml were placed in a ball mill with a diameter of 5 ratio and pulverized for 2 hours and 30 minutes.

After grinding, add 4 to 100' of dimer acid to the slurry.
It was washed with 8 ml of mineral spirits and passed through a 325 mesh screen. Thereafter, solid-liquid separation was performed using a pan filter to obtain a filter cake having a metal content of 7% by weight. This filter cake has a metal content of 65%.
Add mineral spirit until it becomes 30
The mixture was mixed and mixed to obtain an aluminum base. This aluminum paste has a strength of 9400 and a metal content of 10.
It contained about 2.5 parts by weight of dimer acid per part by weight of .

Comparative Example 1 2 Atomized aluminum powder (AAI manufactured by Toyo Aluminum Co., Ltd.
OI) 1.0k9 Mineral Spirit 1.25% Oleic Acid 50ml was placed in a ball mill with a diameter of 5mm and ground for 2 hours and 30 minutes.

After the grinding was completed, the slurry was washed with 8 coats of mineral spirit containing oleic acid at 4 nights/100 millimeters and passed through a 325 mesh screen. Thereafter, an aluminum base was obtained using the same machine as Example 1.
3 This aluminum paste has a hidden force of 9300/m and a metal content of approximately 2.2 parts by weight per 10 parts by weight.
It contained parts by weight of oleic acid. Example 2 Commercially available Prone 3's powder pulverized in the coexistence of stearic acid (
The following composition was kneaded for 1 hour.

Bronze powder (Alcan Metal Powder MD450R)
ichGbld) 1000 Dimer Acid (Empoll 041, manufactured by Emery) 10 The following tests were conducted on the materials obtained in the Examples and Comparative Examples.

The results are summarized in Table 1. Test 1 A metallic paint was prepared with the following composition, and the paint was coated with a doctor blade, and the sharpness of the paint film was visually judged.

Nitrification line lacquer (Bayrac manufactured by Nippon Paint Co., Ltd.) 17 evenings Blue enamel (Unicolor manufactured by Nippon Paint Co., Ltd.) 2 evenings Sample metal pigment (as metal content) 3 Ta test 2
A sample metal pigment was dispersed as a metal component in water/butyl cellosolve (=1/4) medium LOOO, and this dispersion was maintained at 50°C, and the amount of gas generated from the dispersion was measured. .

The measurement period was one month. Test 3 A water-based metallic paint was prepared with the following composition, and the sharpness of the paint film obtained by applying the paint with Doctor Plaid was visually judged.

Gas generation from the paint was also measured over a period of one month when the paint was maintained at 50k9.

A doctor blade was applied after the gas generation test, and the difference from the painted surface before the test was measured using a color difference meter. Water-soluble acrylic varnish (
Aron 557N manufactured by Nippon Arrow Chemical Co., Ltd.)
560 ta water-soluble melamine varnish (Sumimar M-50W manufactured by Sumitomo Chemical Co., Ltd.)
150 Taffeta Russianine Pull 1 (NK Blue manufactured by Dainippon Ink Co., Ltd.)
32 evening butyl cellosolve 90
Test Metal Pigment (as metal content) 48 Test 4 Samples of metal pigment were packed in a tin plate and kept in a 50 qo cold room, and after one month, the presence or absence of the sample was measured using a 325 mesh sieve.

Table 1

Claims (1)

[Claims] 1. An organic solvent-type flaky metal pigment composition containing a dimer acid of 0.81/specific gravity of the metal to 81/specific gravity (parts by weight) of the metal based on 100 (parts by weight) of metal particles. .