JPH01176A - organic precious metal ink - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an organic noble metal ink used for surface decoration of ceramic products, electronic industry, etc., and particularly to an organic noble metal ink containing rhodium alkyl mercaptide.

(Prior art and its problems) It has been widely practiced to double the decorative effect by using ink to draw letters and figures on the surface of ceramic products such as pottery and glass products.

When drawing such letters and figures, instead of using simple ink, organic precious metal ink with the luster of precious metals such as gold and silver is used to form so-called gold letters, etc., to create a more luxurious atmosphere. .

In addition to the organic noble metal ink, a low-viscosity decorative ink called "suikin" is used, and the suikin contains rhodium sulfide terpene, which is a reaction product of rhodium chloride and sulfide terpene. There is.

Although the rhodium sulfide terpene does not cause any trouble when used in water, the rhodium content (1) in the rhodium sulfide terpene is quite small at 3 to 10%. Furthermore, for a given amount of rhodium, the amount added is large (which causes pinholes and deterioration of the surface condition).

(Object of the invention) The present invention uses rhodium alkyl mercaptide, which can provide sufficient viscosity as an organic noble metal ink with a small amount, in place of the conventional rhodium sulfide terpene as a rhodium compound contained in an organic noble metal ink. To provide an organic noble metal ink which can give a good surface condition without producing pinholes when applied to the surface of ceramics etc. by reducing the amount of ink used.

(Means for Solving the Problems) The present invention is an organic noble metal ink characterized by containing at least one noble metal salt of a resin acid, rhodium alkyl mercaptide, and a solvent.

The present invention will be explained in more detail below.

Precious metal salts of resin acids include gold, platinum, iridium, palladium, rhodium, iridium, ruthenium, and alloys thereof, which have been widely used in the past, and one or more of these noble metal salts of resin acids are used. do.

The rhodium alkyl mercaptide of the present invention has the general formula Rh-3- obtained by reacting rhodium chloride with an alkyl sulfide and an alkyl mercaptan.
R, especially rhodium chloride with alkyl sulfide and ter
It means a compound represented by the general formula Rh-5-C(R')(R2)(R') obtained by reacting t-alkylmercaptan (where R, R', R'' and R3 are The Lert-alkyl group of the rhodium-tert-alkyl mercaptide is, for example, tert-amyl, tert-butyl, tert-octyl, tert-dodecyl, tert-tetradecyl,
tert-nonyl and tert-hexadecyl groups.

In addition to the noble metal salt of the resin acid and the rhodium alkyl mercaptide, the present invention also contains a solvent for these components, that is, a solvent for dissolving or suspending these components, such as a terpene alcohol. The solvent is preferably a volatile substance that dissolves or suspends the substance and dries in a relatively short time when an ink containing the substance is applied to ceramics or the like.

The organic noble metal ink of the present invention contains, in addition to the essential components of at least one noble metal salt of the resin acid and the rhodium alkyl mercaptide, a base metal salt of the resin acid, an alkyd resin, a urea resin, a melamine resin, etc. as a binder. can be included.

In the organic noble metal ink of the present invention, rhodium alkyl mercaptide, especially rhodium-tert-
Alkyl mercaptide (Rhodium content approx. 20-25%)
), the amount of rhodium compound used can be significantly reduced, and an organic noble metal ink with a similar viscosity can be prepared using a smaller amount of rhodium compound.

Therefore, pinholes or deterioration of the surface condition due to the use of a large amount of rhodium compound, such as unevenness due to uneven dispersion, do not occur on the surface of the product coated with the organic noble metal ink according to the present invention. , the performance of organic noble metal inks, especially for decorative purposes, is improved.

Examples of the organic noble metal ink according to the present invention will be described below, but the examples are not intended to limit the present invention.

(Example) Organic gold ink was prepared by mixing the following components.

Resin molding...20% by weight Rhodium-tert-dodecyl mercaptide...0.
1% by weight Bismuth resinate...0.3% by weight Chromium resinate...0.04% by weight Antimony resinate...0.02% by weight Vanadium resinate...0.03% by weight Alkyd resin. ...20% by weight Urea melamine resin...3.0% by weight Terpene alcohol...Remainder.

When the ink, which has a suitable viscosity, is applied to the surface of ceramics or glass using a brush or screen printing, and fired by heating at 500 to 800°C for 10 to 30 minutes, the result is a golden luster with no cracks or irregularities. A coating was formed.

(Comparative example) On the other hand, rhodium-tert-dodecyl mercaptide 0.1
An organic gold ink was prepared in the same manner as in the above example using 0.1% by weight of α-pinene rhodium sulfide instead of 0.1% by weight, and an attempt was made to apply it to the ceramic surface using a brush, but the viscosity was insufficient. It was not possible to apply the required amount.

Next, the amount of rhodium sulfide α-pinene was reduced to 1% by weight, an organic gold ink was prepared in the same manner as in the example, and applied to the surface of the pottery and fired. Although the ink could be applied easily in the same manner as the ink of the previous example, cracks appeared on the ceramic surface after firing, making it unsuitable as a decorative ink.

(Effects of the Invention) The present invention uses rhodium alkyl mercaptide, which has a relatively large rhodium content, in place of the conventional rhodium sulfide terpene, which has a small rhodium content, as a rhodium compound added to the organic noble metal ink. Therefore, even if the amount of rhodium alkyl mercaptide added is small, the viscosity of the organic noble metal ink produced can be made sufficient for screen printing, and since the amount of rhodium alkyl mercaptide added is small, it can be applied and baked This prevents deterioration of the surface condition of the cured product, such as cracking, on the surface of the cured ceramics, etc., and the usefulness of the organic noble metal ink of the present invention for decorative and electronic purposes is greatly improved.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (4)

[Claims] (1) An organic noble metal ink containing at least one noble metal salt of a resin acid, rhodium alkyl mercaptide, and a solvent. (2) The organic compound according to claim 1, wherein the noble metal of the noble metal salt is one or more noble metals selected from the group consisting of gold, platinum, silver, palladium, iridium, ruthenium, and alloys thereof. Precious metal ink. (3) Rhodium alkyl mercaptide is rhodium-te
Claim 1 which is rt-alkyl mercaptide
The organo precious metal ink according to item 1 or 2. (4) The alkyl group of rhodium-tert-alkyl mercaptide is tert-amyl, tert-butyl, t
The organic noble metal ink according to claim 3, wherein the alkyl group is selected from the group consisting of ert-octyl, tert-dodecyl, tert-tetradecyl, tert-nonyl and tert-hexadecyl.