JPS5899141A - Paste for forming transparent film - Google Patents

Abstract

PURPOSE:To obtain printing paste applicable to screen printing and capable of forming a transparent PbO2 film by calcination by incorporating an org. lead compound which forms PbO2 by calcination and is soluble in an org. solvent. CONSTITUTION:Paste is composed of an org. lead compound, an org. solvent and a thickener. The preferred org. lead compound is octyl lead, hexyl lead or butyl lead all of which are soluble in the org. solvent, especially octyl lead, and it is added so as to adjust the Pb content of the paste to 1-10wt%. The preferred org. solvent is terpineol 2-ethylhexanol, benzyl alcohol or the like, and the preferred thickener is nitrocellulose, ethylcellulose or the like. The paste is coated by screen-printing with a screen plate patterned to a desired shape, and it is calcined to form a transparent PbO2 film of the desired shape.

Description

Detailed Description of the Invention The present invention relates to a transparent metal oxide coating formed on a substrate such as glass or ceramic, more specifically, a transparent metal whose transparent coating is lead dioxide (PbO,). Regarding oxide film.

Generally, the main methods for forming PbO and transparent films are vacuum evaporation, chemical spraying, and dipping. Although the true 9-evaporation method has excellent film characteristics, it has problems with mass production, and further processes such as etching are required to support patterning.

On the other hand, the chemical spray method and the dipping method have no problem in mass production, but have the same problem with patterning. As described above, the conventional method has its advantages and disadvantages, and it is difficult to say that it is necessarily an excellent method.

The present invention can be screen printed, and by firing Pb
In order to provide a printing paste that can form a coating, the paste is characterized by containing an organic lead compound in an organic solvent, which is a compound that forms a coating by firing.

That is, the organic lead compound, organic solvent, and viscosity agent constitute a paste. As the organic lead compound, chemically stable examples such as lead octylate, lead hexyculate, and lead butylate are suitable. Examples of organic solvents that can dissolve organic lead compounds include high-boiling point alcohols such as terpineol, 2-ethyl alcohol, benzyl alcohol, and high-boiling point esters such as benzylacetate and dimethyl phthalate.

High boiling point organic solvents such as high boiling point alcohol ethers such as calpitol, butyl calpitol and butyl cellosolve are used, and cellulose compounds such as nitrocellulose and ethyl cellulose are used as viscosity agents.

Using the paste made in this way, screen printing is performed using a screen plate patterned into the desired shape, and after preliminary drying, baking is performed at a temperature of 400°C or higher.
bO, a transparent film is formed into a desired shape. This film is not only transparent, but also has high film strength and relatively high insulation properties. Furthermore, by appropriately controlling the amount of Pb contained in the paste, a film of 5000A or less can be freely formed.

The PbO, transparent coating and PbO, transparent coating forming paste of the present invention have slightly different properties from those of conventional ones, and can be applied in many fields. Hereinafter, a detailed explanation will be given based on examples.

Example 1 Rubitol: butyl cellosolve: dimethyl phthalate)=
A mixed organic heating medium mixed in a ratio of 3:1:1 and 15 wt% of nitrocellulose as a viscosity agent were added to give a paste viscosity of 80,000 cp, and the final Pb content was CL1 to 1 Qwt% based on the total amount. prepared as follows,
I created a Fu Ling paste. This paste was screen printed on a soda glass substrate using a screen plate of 250 mesh stainless steel net, pre-dried at 150°C for 20 minutes, and then baked at 500°C for 50 minutes. The characteristics were investigated and the results are shown in the table below.

In addition, in the table, the mark "X" means that it was judged to be bad, the mark Δ means that it was judged that it was "slightly bad", the mark "O" means that it was judged to be good, -
Marks Fi indicate items that cannot be measured. Moreover, the light transmittance (visible part min) indicates the lowest transmittance among the wavelengths of 580 to 800 nm.

From the above results, when the Pb content is 1 to 10 wt%, the film strength and electrical insulation are high, 50%
It is understood that a coating on clothing can be formed freely between 0 and 500 DA.

Example 2 Using 2-ethylhexanol as an organic solvent and ethyl cellulose as a viscosity agent, a paste viscosity of 80,000 cp was prepared using 2-ethylhexanol as an organic solvent and ethyl cellulose as a viscosity agent. Almost the same results as in Example 1 were obtained, except that they were slightly inferior.

The present invention has the above-described configuration, and can provide a paste that can be screen printed, thereby obtaining a transparent film that is suitable for mass production and easy to pattern.

Claims (3)

[Claims] (1) A paste for forming a transparent film, which is a compound that forms a film of lead dioxide upon firing, and contains about 7% of an organic lead compound soluble in an organic solvent. (2) In paragraph (1) of the scope of the request for permissible rust under Section 41,
A paste for forming a transparent film, characterized in that the organic lead compound is lead octylate. (3) According to claim (2), the amount of lead octylate added is adjusted so that the lead content in the total amount of paste is about 1 to 10% by weight. A transparent film-forming paste characterized by: