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.
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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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