JPS6148589B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a transparent metal oxide film formed on a substrate such as glass or ceramics, and more particularly to a transparent metal oxide film in which the transparent film is cerium oxide Ce ₂ O ₃ . Generally, the main methods for forming Ce ₂ O ₃ transparent films are vacuum evaporation, chemical spraying, and dipping. Although the vacuum evaporation method has excellent film characteristics, it has problems in mass production, and in order to support patterning, it is necessary to perform further processing such as etching.
On the other hand, the chemical spray method and the dipping method have no problems in mass production, but have the same problems with patterning. As described above, the conventional methods have advantages and disadvantages, and cannot necessarily be called superior methods. The present invention was made in order to provide a printing paste that can be screen printed and form _{a Ce 2 O 3} film upon firing. The paste is characterized by containing a solvent-soluble organic leadide.
That is, the organic cerium compound, organic solvent, and viscosity agent constitute a paste. The organic cerium compound is chemically stable, such as trisacetylacetonatocerium () [Ce
(acac) ₃ ] is suitable. In addition, examples of organic solvents for dissolving organic cerium compounds include high-boiling alcohols such as terpineol, 2-ethylhexanol, and benzyl alcohol; high-boiling esters such as benzyl acetate and dimethyl phthalate;
High boiling point organic solvents such as high boiling point alcohol ethers such as carbitol, butyl carbitol 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 pre-drying, the Ce ₂ O ₃ transparent film is baked at a temperature of 400℃ or higher to form the desired shape. is formed. This film is not only transparent, but also has high film strength and relatively high insulation properties. Furthermore, by appropriately controlling the amount of Ce(acac) ₃ contained in the paste, a film of any desired thickness can be freely formed. The Ce ₂ O ₃ transparent coating and Ce ₂ O ₃ transparent coating forming paste of the present invention have slightly different properties from conventional ones,
It can be applied in many fields. Hereinafter, a detailed explanation will be given based on examples. Example 1 Tris acetylacetonate cerium [Ce(acac) ₃ ] coordinated with acetylacetone was mixed with a mixed organic solvent in a ratio of benzyl acetate: butyl carbazole: butyl cellosolve = 5:3:2, and nitrocellulose as a viscosity agent. 15wt% was added to make the paste viscosity 80000cp, and finally Ce
(acac) The content of ₃ is 1 to 1 to the total amount of paste.
Each paste was prepared so as to have a concentration of 30 wt%. Use this paste to make stainless steel net
Screen printing was performed on a soda glass substrate using a 250-mesh screen plate, pre-dried at 150℃ for 20 minutes, and then baked at 500℃ for 30 minutes to examine the film thickness and other characteristics of each film. Shown in the table below. Note that in the table, an x mark indicates something that was judged to be bad, a △ mark something that was judged to be slightly bad, an ○ mark something that was judged to be good, and a - mark something that could not be measured. Also, light transmittance (visible area min.)
indicates the lowest transmittance among the wavelengths of 380 to 800 nm.

[Table] From the above results, Ce (acac) ₃ content is 10~
It can be seen that when the content is 15 wt%, a film with good transparency, film strength, and electrical insulation properties can be freely formed. Example 2 An experiment similar to Example 1 was conducted using a mixed solvent of benzyl alcohol: terpineol = 2:1 as an organic solvent and ethyl cellulose (12 wt%) as a viscosity agent to prepare a paste with a viscosity of 80,000 cp. Almost the same results as in Example 1 were obtained, except that the film strength was 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 (1)

[Scope of Claims] 1. A paste for forming a transparent film, which is a compound that forms a cerium oxide film upon firing, and contains an organic cerium compound that is soluble in an organic solvent. 2. A paste for forming a transparent film according to claim 1, wherein the organic cerium compound is cerium trisacetylacetonate. 3. The paste for forming a transparent film according to claim 2, wherein the cerium trisacetylacetonate is contained in an amount of about 10 to 15% by weight in the total amount of the paste.