JPH08310833A - Low melting point glass paste - Google Patents

Abstract

(57) [Summary] [Structure] A low melting point glass paste obtained by dispersing low melting point glass and lipophilic smectite in an organic solvent or in a solution of a carboxylic acid in an organic solvent. [Effect] A pattern without residual charcoal can be drawn easily.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a low melting glass paste. Specifically, it relates to a paste of low melting point glass containing a specific smectite.

[0002]

2. Description of the Related Art It is widely practiced to form a composition of ceramic or glass powder and a binder into a sheet and then sinter it to form a ceramic or glass molded article. By using a binder, it is possible to manufacture a multi-layer molded product. It has also become necessary to manufacture ceramic or glass moldings of complex shape, to evacuate the moldings or to bond the ceramic or glass moldings for filling with an inert gas.

[0003]

The paste of ceramic or glass powder used for bonding is not only required to have sufficient fluidity, but also the binder used should not remain after bonding or impair the properties. It is usual to use a polymer that decomposes at a low temperature as a binder, but a glass that melts at a lower temperature has been developed, and it is difficult to solve the problem on the conventional extension line.

[0004]

Means for Solving the Problems The present inventors have completed the present invention by solving the above-mentioned problems and searching for a low-melting glass paste which is easy to handle and can be fired into a desired glass. .

That is, the present invention is a low-melting glass paste obtained by dispersing low-melting glass and lipophilic smectite in an organic solvent.

As the low-melting glass used in the paste of the present invention, glass powder having a composition that melts at a low temperature (usually 500 ° C. or lower) is used, and various commercially available low-melting glasses can be used. As the glass, glass containing lead oxide, bismuth oxide, or the like as a main component has a low melting point and can be preferably used.

In the present invention, the lipophilic smectite is an alkali metal salt of silicic acid or an alkaline earth metal salt as a base, and an alkali metal or alkaline earth metal ion is inserted between the layered silicic acid layers. Various structures are known, and those based on a magnesium salt of silicic acid are well known and can be preferably used. To make it lipophilic, it is possible to treat these smectites with a quaternary ammonium salt, and various substances are already on the market.

Preferred examples of the organic solvent in the present invention include aromatic compounds such as benzene, toluene and xylene, and halogenated hydrocarbon compounds such as perchlorethylene and chlorobenzene.

As the carboxylic acid used as necessary in the present invention, compounds having a carboxyl group having 1 to 25 carbon atoms can be preferably exemplified, and any of aliphatic, alicyclic and aromatic compounds can be used. It can be used, but considering the solubility in water and the effect on the environment, the aliphatic carbon number is 1 to 1.
About 10 carboxylic acids are preferably used. The number of carboxyl groups does not have to be one in the molecule, and one having 1 to 4 carboxyl groups is used. For example, one having one carboxyl group such as formic acid, acetic acid, butyric acid, pentyl acid, hexylic acid, heptyl acid, octylic acid, lauric acid, stearic acid, carboxylic acid group such as oxalic acid, succinic acid, adipic acid, sebacic acid, etc. There are two things.

The low melting glass paste in the present invention is
The low-melting glass and the lipophilic smectite are dispersed in an organic solvent or an organic solvent solution of carboxylic acid. At this time, the organic solvent is 5 to 10 relative to 100 of the low-melting glass.
0 (weight ratio), 0.001 as the ratio of lipophilic smectite
In general, the proportion of -5 to 5 (weight ratio) and the proportion of carboxylic acid are 0 to 5 (weight ratio). If the proportion of lipophilic smectite and carboxylic acid is less than this range, the viscosity is low, and if it is more than this range, the fluidity is completely lost.

In the present invention, the dispersing method is not particularly limited and can be sufficiently dispersed by a usual dispersing method, but normally, the lipophilic smectite is dispersed in an organic solvent, and then glass powder is added and further dispersed. When a carboxylic acid is used here, it may be added after the lipophilic smectite is dispersed in the organic solvent or before the dispersion. When dispersing the glass powder, it is possible to obtain a preferable paste by adopting a method capable of strongly dispersing such as a ball mill.

The method of using the low melting point glass paste is not particularly limited, but usually, the above paste is applied on a substrate, dried, and then heated to the melting temperature of the glass powder to draw a glass pattern.

[0013]

EXAMPLES The present invention will be further described with reference to the following examples.

Example 1 0.20 part of lipophilic smectite (manufactured by Corp Chemical Co., Ltd., synthetic smectite SAN) and 0.02 acetic acid per 100 parts by weight of glass powder mainly composed of lead oxide having a melting point of about 300 ° C.
20 parts of toluene in which 1 part was dissolved was mixed well to form a paste. Here, the glass powder was added after the smectite was sufficiently dispersed. Draw a glass paste pattern on an alumina substrate by screen printing, remove toluene at 50 ° C, and heat to 400 ° C for 1 hour to draw a glass pattern. It melts and a pattern with 1 mm intervals is obtained. It was The melting pattern was similar to that of glass powder heated and melted as it was, and there was no coloring due to residual carbon.

Comparative Example 1 Toluene was used as a solvent and poly α was used as a binder.
-Methylstyrene (molecular weight 100000, 100 parts by weight of glass powder, 10 parts by weight of poly α-methylstyrene, 30 parts of toluene)
The same procedure as in Example 1 was carried out except that the paste obtained by using (part) was used, and a pattern with an interval of 1 mm was obtained, but it was observed that the glass was blackish brown and had residual carbon.

Comparative Example 2 The same procedure as in Example 1 was carried out except that lipophilic smectite was not used. As a result, glass powder immediately settled into a paste and printing was not possible.

Example 2 A glass pattern having no problem was obtained in the same manner as in Example 1 except that propionic acid was used as the carboxylic acid.

Example 3 A glass pattern having no problem was obtained in the same manner as in Example 1 except that benzoic acid was used as the carboxylic acid.

Example 4 A glass pattern was obtained in the same manner as in Example 1 except that 0.8 part of the lipophilic smectite was used and acetic acid was not used, but a glass surface had irregularities.

[0020]

Industrial Applicability By using the paste of the present invention, it is possible to easily draw a pattern without residual charcoal and is industrially valuable.

Claims (2)

[Claims] 1. A low melting point glass paste obtained by dispersing low melting point glass and lipophilic smectite in an organic solvent. 2. A low melting glass paste obtained by dispersing low melting glass and lipophilic smectite in an organic solvent solution of carboxylic acid.