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Preparation method of silane coupling agent-coated modified talc powder and mirror back coating for silver mirror

A technology of silane coupling agent and talcum powder, which is applied in anti-corrosion coatings, polyurea/polyurethane coatings, coatings, etc., can solve problems such as reducing lead content, accelerating copper plating layer corrosion, general heat and humidity resistance, and achieving water resistance Alkali-resistant flexibility, improved chemical resistance, and the effect of lowering the unblocking temperature

Active Publication Date: 2014-10-01
南宝树脂(中国)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the research on glass silver mirror mirror back coating is concentrated on the modified aspect of resin, but the patented technology cited by these researches, such as the disclosed "quick-drying high-solid content coating based on modified alkyd resin", is a A kind of composition of acrylic modified alkyd resin cured at room temperature and high solid. Although the composition has good dryness at room temperature, a small amount of amino resin can also be added to improve water resistance, but its performance is only compared with that of nitro paint. Although in this composition On the basis of modification, a double-layer silver mirror mirror back coating has been prepared, but it is far from meeting the high requirements for the comprehensive performance of glass silver mirrors; there are also hyperbranched unsaturated polyester quick-drying resins, but no anti-corrosion Pigments cannot meet the high requirements of the comprehensive performance of glass silver mirrors; a lot of work has been done on the anti-corrosion pigment cyanamide zinc, but the cyanamide zinc anti-corrosion pigment will have free cyanamide ions on Cu 2+ It has a strong complexing ability, and its product has good water solubility, which will accelerate the corrosion of the copper plating layer; lead oxide and zinc oxide compounds are also used to replace red lead, which reduces the lead content. Although the corrosion resistance has improved, However, the resistance to heat and humidity is average, and it still fails to contain heavy metals such as lead, which is not friendly to the environment
[0005] Commonly used phosphate, aluminum tripolyphosphate, molybdate and other lead-free anti-corrosion pigments cannot form a precipitation film and an adsorption film like red lead on the copper-silver composite coating or silver coating. The performance is not as good as red lead, and sometimes even accelerates the corrosion of copper-silver composite plating or silver plating
So far, there has been no report of using silane coupling agent-coated benzimidazole compounds to modify talc powder and then coating with silane coupling agent as an anti-corrosion pigment to prepare a single-coat lead-free silver mirror back coating. There is also no report that can reach the performance of the red lead-free silver mirror mirror back coating.

Method used

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  • Preparation method of silane coupling agent-coated modified talc powder and mirror back coating for silver mirror
  • Preparation method of silane coupling agent-coated modified talc powder and mirror back coating for silver mirror
  • Preparation method of silane coupling agent-coated modified talc powder and mirror back coating for silver mirror

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Experimental program
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Effect test

Embodiment 1-6

[0029] 1. Preparation of modified talc powder coated with silane coupling agent:

[0030] (1) According to the dosage of each component of the formula in Table 1, fully dissolve the organic corrosion inhibitor with absolute ethanol to obtain the ethanol solution of the organic corrosion inhibitor, and put the ethanol solution of the above organic corrosion inhibitor and talcum powder into the In the spherical tank of the planetary ball mill, the volume ratio of the grinding balls in the spherical tank of the ball mill to the total material is 2 to 3:1, and it is ground in a closed spherical tank at a speed of 300 to 400r / min for 4 to 6 hours. talcum powder dispersion;

[0031] (2) Dissolve the silane coupling agent fully in isopropanol according to the dosage of each component in the formula in Table 1, then add it to the modified talc powder dispersion obtained in (1), and grind it in the above-mentioned closed ball mill ball Continue grinding in the tank at a speed of 300-4...

Embodiment 7-12

[0033] 2. Preparation of single-coat lead-free silver mirror mirror back coating:

[0034] According to the dosage of each component of the formula in Table 2, add hydroxy acrylic resin and ester solvent to the dispersion tank while stirring until uniform, then add coloring pigment, extender pigment and one of each to the above mixture while stirring. Examples Prepare the obtained modified talc powder coated with silane coupling agent until it is uniformly dispersed, and then grind the above-mentioned substance through a sand mill until the fineness is less than 20 μm, and then stop to obtain a pre-dispersion; add to the above-mentioned pre-dispersion The closed polyurethane curing agent and ketimine are dispersed until uniform, and after passing the inspection, the steps of filtration, metering and packaging are carried out to obtain a single-coat lead-free silver mirror back coating. Wherein the unit in Table 2 is the percentage of each component accounting for the total wei...

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Abstract

The invention discloses a method for preparing silane coupling agent cladding modified talcum powder and a silver mirror back coating. A benzimidazole compound is taken as organic corrosion inhibitor modified talcum powder, and then is coated with a silane coupling agent, the silane coupling agent cladding modified talcum powder is obtained, and the obtained object is taken as an anti-corrosion pigment for the single coating lead-free silver mirror back coating. The anti-corrosion pigment is combined with a hydroxy acrylic resin, an enclosed type polyurethane curing agent, ketamine, corresponding filling materials and an ester solvent, so that the single coating lead-free silver mirror back coating which is excellent in performance is prepared. The prepared mirror back coating is good in film coating hardness and flexibility and excellent in acid and base resistance and chemical corrosion resistance; particularly the acid resistance and the resistance to heat and humidity can reach the high performance of silver mirror back coating containing red lead; and the coating doesn't contain hazardous substances such as lead and the like and is environment-friendly.

Description

technical field [0001] The invention relates to an anti-corrosion pigment for glass silver mirrors and a mirror back coating containing the anti-corrosion pigment, in particular to a kind of benzimidazole compound used as an organic corrosion inhibitor to modify talcum powder, and then use a silane coupling agent to modify the talc powder. Coating the obtained anti-corrosion pigment, and the silver mirror mirror back paint containing the anti-corrosion pigment. Background technique [0002] At present, there are two kinds of common glass mirrors: aluminum mirror and silver mirror. The aluminum mirror is cheap and the production process is simple, but the visible light reflectivity is low, and the silver mirror is expensive but the visible light reflectivity is high, so they have a large share in the market. Among them, silver mirrors are divided into glass mirrors with copper-silver composite coating and glass mirrors with only silver coating. The production method of copper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/28C09C3/12C09C3/08C09D7/12C09D175/04C09D5/08
Inventor 孙德聪
Owner 南宝树脂(中国)有限公司