JPS5899142A - Paste for forming transparent film - Google Patents

Abstract

PURPOSE:To obtain printing paste applicable to screen printing and capable of forming a transparent ZnO film by calcination by incorporating an org. zinc compound which forms ZnO by calcination and is soluble in an org. solvent. CONSTITUTION:Paste is composed of an org. zinc compound, an org. solvent and a thickener. The preferred org. zinc compound is bisacetylacetonato-zinc which is soluble in the org. solvent, and it is added so as to adjust the Zn content of the paste to 5-15wt%. 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 ZnO film of the desired shape.

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 zinc oxide (ZnO). Regarding.

General) The method for forming the ZnO transparent film is the vacuum evaporation method.

The main methods are chemical spray method and dipping method. Although the vacuum evaporation method has excellent film characteristics, it has problems with productivity.
In addition, in order to support patterning, it was necessary to perform further processing such as etching.On the other hand, chemical spraying and dipping methods have no problem with mass production, but patterning is similar to the former method. There is. As described above, the conventional methods have advantages and disadvantages, and cannot necessarily be called superior methods.

The present invention can be screen printed, and Zn can be produced by baking.
This was created to provide a printing paste that can form an O film, and is characterized by containing an organic zinc compound soluble in an organic solvent, which is a compound that forms a ZnO film by firing.

That is, a paste is composed of the organic zinc compound, an organic solvent, and a viscous agent. A chemically stable example of the organic zinc compound is bisacetylacetoner-F zinc (1).
(Zn (acac), ) is 4”r.

In addition, as an organic solvent for dissolving organozinc compounds,
Terpineol, 2-ethylhexanol.

High boiling point alcohols such as benzyl alcohol, hesylylacetate. High-boiling organic solvents such as high-boiling esters such as dimethyl heptalate, high-boiling alcohol ethers such as calpitol, butyl calpitol, and butyl hepta-rosol 1 are used, and cellulose compounds such as Nidri cellulose and ethyl cellulose are used as viscosity agents. used.

Using the paste made in this way, screen printing is performed using a screen plate patterned into the desired shape, and after pre-drying, baking at a temperature of 400°C or higher produces Zn.
An O transparent coating is formed into the desired shape. This film is not only transparent, but also has high film strength and relatively high insulation properties. In addition, Zn (acac) contained in the paste
By appropriately controlling @, it is possible to freely form a film of zsoo & below.

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

Example 1 Bisu-7tyl-7-tonate Zn (GCISC) 1, Butyl carbyl: Butyl hepta-rosol: Benzyl acetate), 3:, 2:! A mixed organic solvent mixed in the ratio of i, 15 wt of nitrocellulose as a viscosity agent was added to make the paste viscosity 80,000 cp, and the final niZn
The content of (αccLc)1 is 1 to 2 relative to the total amount of paste.
Each paste was prepared so that oWt was slow.

Using this paste, screen printing was performed on a soda glass substrate using a screen plate of 250 mesh of stainless steel net, and after pre-drying at 150°C for 20 minutes,
After firing for 0 minutes, the film thickness and other characteristics of each film were examined, and the results are shown in the following table. Note that in the table, the X mark indicates that the ivy was determined to be bad, the Δ mark indicates that it was judged to be somewhat rushed, the ○ mark indicates that it was judged to be good, and the - mark indicates that it was impossible to measure. In addition, the light transmittance (visible part mln
, ) indicates the lowest transmittance among the wavelengths of 380 to 800 nm.

From the above results, the content of Zn (icac) is 5 to 1.
It can be seen that when the weight is 5 wt, a coating with a good coverage, high film strength and electrical insulation properties, and a thickness of about 500 to 2000 A can be freely formed.

Example 2 A mixture of 2-ethylhexanol and benzyl alcohol (1=3) was used as the WSS medium, and ethyl cellulose was used as the viscosity agent.
000Cp&: was prepared and the same experiment as in Example 1 was conducted, and almost the same results were obtained. As a result, a transparent film suitable for wrinkle production and easy to turn can be obtained.

Claims (1)

[Claims] (1) A compound that forms a zinc oxide film upon firing, and contains an organic zinc compound that is soluble in an organic solvent.
1. A paste for forming a transparent film. (2. A paste for forming a transparent film, as set forth in claim (1), characterized in that the lead compound is zinc bisacetylacetonate. (3) Claim No. (1) 2) The paste for forming a transparent film, wherein the zinc bisacetylacetonate is contained in an amount of about 5 to 15% by weight in the total amount of the paste.