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Back coating composition and mirror

A technology of composition and coating, applied in the direction of mirrors, anti-corrosion coatings, epoxy resin coatings, etc., can solve problems such as silver mirror film corrosion, and achieve excellent acid resistance

Inactive Publication Date: 2012-07-18
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing back coating film cannot sufficiently suppress corrosion caused by acid, and the silver mirror film may corrode mirrors installed in bathrooms, powder rooms, washrooms, etc. due to strong acidic chemicals.

Method used

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  • Back coating composition and mirror
  • Back coating composition and mirror
  • Back coating composition and mirror

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0107] According to the composition ratio shown in the column of Example 1 of Table 1, each raw material was sealed in a paint shaker and shaken for 15 minutes to prepare a back coating composition.

[0108] Spray a silver plating solution made of a solution containing silver nitrate and a reducing solution that reduces silver on the surface of a fully cleaned glass substrate (size 90mm×40mm×5mm), and the silver is precipitated by the silver mirror reaction to form a film with a thickness of 1.0g / m 2 silver mirror mask.

[0109] After the surface of the silver mirror film is washed with water, a copper plating solution consisting of a solution containing copper sulfate and a reducing solution for reducing copper is sprayed on the surface, and copper is precipitated by an electroless plating method to form a film thickness of 0.3 / m 2 copper protective film.

[0110] After the surface of the copper protective film was washed with water and dried, the temperature of the glass...

example 2～16

[0116] Each raw material was prepared according to the composition ratio shown in the columns of Examples 2-16 of Tables 1-3, and the back coating composition which has the composition described in each column was prepared, respectively.

[0117] Except changing the back coating composition, the same operation as Example 1 was carried out to obtain mirrors (with copper protective film and without copper protective film).

example 17～32

[0119] Each raw material was prepared according to the composition ratio shown in the columns of Examples 17-32 of Tables 4-6, and the back coating composition which has the composition described in each column was prepared, respectively.

[0120] Except changing the back coating composition, the same operation as Example 1 was carried out to obtain mirrors (with copper protective film and without copper protective film).

[0121] Based on the evaluation results of the viscosity of the back coating compositions described in Examples 1 to 32, the following hydrochloric acid test (1) and the following hydrochloric acid test (2) were performed on mirrors obtained using the back coating compositions described in Examples 1 to 32. The results of the performance test and the results of evaluating the appearance of the coating film of the back coating composition are shown in Tables 1-6, respectively.

[0122] (hydrochloric acid test (1))

[0123] A mirror of size 90 mm x 40 mm was ...

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PUM

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Abstract

Disclosed is a back coating composition capable of forming a back coating film which is not susceptible to acid erosion, and also disclosed is a mirror having excellent acid resistance. A back coating film (14) is formed on a metal film (a silver mirror film (12) or a metal protective film (13)) of a mirror (10) using a back coating composition containing a thermosetting resin, a pigment, and a dispersant, wherein an amino group-containing polymer which has an amine value of 20 mg KOH / g or more and does not have an acid group is contained as the dispersant.

Description

technical field [0001] The present invention relates to a back coating composition for forming a back coating film on the back surface of a mirror, and a mirror having a back coating film formed on the back surface thereof. Background technique [0002] In a mirror with a silver mirror film formed on a glass substrate, in order to prevent corrosion of the silver mirror film, a copper protective film is formed on the silver mirror film, and a back coating film is formed on the copper protective film. [0003] As a back coating composition for forming a back coating film, a composition containing a thermosetting resin (epoxy resin, alkyd resin, etc.) and a pigment (extender pigment, antirust pigment, etc.) is generally used (see Patent Document 1, 2). [0004] However, conventional back-coating films cannot sufficiently suppress corrosion caused by acid, and mirrors installed in bathrooms, powder rooms, washrooms, etc. may be corroded by strong acidic chemicals. Therefore, d...

Claims

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Application Information

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IPC IPC(8): C09D201/00C09D5/08C09D7/12C09D163/00G02B5/08
CPCC09D201/025C09D7/02G02B5/08C08G59/4021C09D163/00C09D7/45
Inventor 阿部啓介加藤朱美
Owner ASAHI GLASS CO LTD
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