Mirror back protective coating for copper-free silver mirror

A technology for protecting coatings and mirror backs, applied in polyester coatings, epoxy resin coatings, coatings, etc., can solve the problem of inability to provide corrosion resistance, resistance to CASS and salt spray tests, ammonia water resistance, and copper-silver mirror back protection The coating cannot use copper-free silver mirrors, and cannot meet the problems of corrosion resistance and ammonia water resistance of copper-free silver mirrors. It achieves excellent physical and chemical properties, is conducive to large-scale industrial production, and has the effect of rapid drying.

Inactive Publication Date: 2010-07-21
常州市弘可利办公用品有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating prepared by this method has the advantages of one-time single-coating construction, but because only one organic component of short-oil alkyd resin is used, its protective performance on the silver layer is relatively simple, and it cannot meet the higher requirements of silver mirrors without copper layers. Performance requirements such as corrosion resistance and ammonia water resistance, and the pigment contains lead compounds, which are potentially harmful to the environment
[0005] Conventional mirror back protection coatings with copper and silver mirrors cannot be used for environmentally friendly copper-free silver mirrors. These coatings cannot form better adhesion to the silver layer, nor can they provide excellent corrosion resistance, resistance to CASS and salt spray tests and Ammonia resistance and other properties

Method used

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  • Mirror back protective coating for copper-free silver mirror
  • Mirror back protective coating for copper-free silver mirror
  • Mirror back protective coating for copper-free silver mirror

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation of embodiment 1 primer

[0047] Put the modified alkyd resin, acrylate resin, phenolic resin, cross-linking resin, pigment, filler, and solvent into the stainless steel tank according to the formula described in Table 1 and stir evenly, then put it into the sand mill and grind it until If the fineness is less than 25μm, add various film-forming aids according to the weight percentage in the table, such as: anti-skinning agent, silane coupling agent and / or titanate coupling agent, drier, stir evenly and filter.

[0048] Table 1 Primer ingredient list (weight percentage)

[0049]

Embodiment 2

[0050] Embodiment 2 Preparation of topcoat

[0051] Put the modified alkyd resin, acrylate resin, phenolic resin, cross-linking resin, pigment, filler, and solvent into the stainless steel cylinder according to the formula described in Table 2 and stir evenly, then put it into the sand mill and grind it until If the fineness is less than 25μm, add various film-forming aids according to the weight percentage in the table, such as: anti-skinning agent, silane coupling agent and / or titanate coupling agent, drier, stir evenly and filter.

[0052] Table 2 topcoat ingredient list (weight percentage)

[0053]

Embodiment 3

[0054] Embodiment 3 Forming and detection index of coating

[0055] The primer and topcoat of the present invention are diluted with xylene to a construction viscosity of 25-35s (coated with -4 cups, 25°C) during construction, fully stirred evenly, then poured into the paint tank, and adjusting the width of the paint knife Make the dry film meet the specified requirements. First coat the silver layer of the copper-free mirror with a primer and then a topcoat. After drying at about 120-150°C for 5-8 minutes, the film performance of the coating reaches the performance indicators in Table 3.

[0056] Table 3 Performance indicators of protective coatings on the back of copper-free silver mirrors

[0057]

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PUM

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Abstract

The invention relates to a mirror back protective coating for a copper-free silver mirror. The protective coating comprises base coat and finishing coat, wherein both the base coat and the finishing coat comprise modified alkyd, acrylate resin, novolac epoxy resin and crosslinked resin. The novolac epoxy resin and the crosslinked resin can form a rigid netted dense structure after undergoing a high-temperature curing reaction, so that the corrosion resistance of the coat is greatly improved, long-term effective protection of a silver layer is realized, and the coat is endowed with appropriate rigidity and scratch resistance. The coating of the invention contains a great amount of radicals such as epoxy groups, ether bonds, hydroxide radicals and the like, thereby greatly increasing the adhesive force of the coat. The coating of the invention does not adopt anti-corrosion lead-containing compounds, thereby avoiding environment pollution. The coating of the invention can adopt a large-scale curtain-coating molding process, can realize quick drying, can be completely solidified after being roasted at the temperature of between 120 and 150 DEG C for 5 to 8 minutes, has excellent physical and chemical properties and contributes to large-scale industrial production.

Description

technical field [0001] The invention relates to a coating for the back of a mirror, in particular to a coating for protecting the back of a copper-free silver mirror, including a primer and a topcoat. Background technique [0002] The manufacturing method of the mirror is to first coat various metals on the glass substrate by wet chemical plating process or vacuum evaporation. The common one is 80-150nm silver film or aluminum film to reflect light. According to the different reflective layers, they are called silver mirrors and aluminum mirrors, among which silver mirrors are widely used in such high-end places because of their clear imaging. In the silver mirror, in order to protect the silver layer, it is necessary to use the copper mirror chemical reaction method to plate a layer of metal copper. In order to protect the metal layer from chemical corrosion and physical damage, the metal plating layer needs to be coated with primer and topcoat The chemical reaction of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/08C09D133/04C09D163/04G02B1/10G02B1/14
Inventor 包柏青童朝健
Owner 常州市弘可利办公用品有限公司
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