Process for preparing low temperature baking silver mirror back lacquer

Abstract

The lower temperature baked silver mirror back lacquer consists of priming lacquer and finishing paint. The priming lacquer consists of inorganic cross-linking agent, talc powder, barium sulfate, modified alkyd resin, coloring pigment, antiskimming agent, drying agent, and organic solvent in certain weight proportion. The finishing paint consists of inorganic cross-linking agent, talc powder, barium sulfate, modified alkyd resin, coloring pigment, antiskimming agent, drying agent, leveling agent and organic solvent in certain weight proportion. The present invention has silver mirror back lacquer with baking temperature lowered to 100 deg.c, raised adhesion, high wet head resistance, high temperature change tolerance, high salt fog resistance, high salt water resistance, high corrosion resistance and good post finishing property.

Description

technology field; [0001] The invention relates to a preparation method of a paint, in particular to a preparation method of a low-temperature baked glass silver mirror back paint. Background technique: [0002] The production method of the glass silver mirror is to first coat a layer of metallic silver on the glass surface with a silver mirror chemical reaction method as a reflective layer, and then use a copper mirror chemical reaction method to coat a layer of metallic copper to increase the reflection effect of the silver film and Protective effects. Since the metal layer of glass is easily corroded by the atmosphere, and the use environment is mostly in places with high humidity, large temperature difference and strong corrosion, the metal layer is easily corroded and tarnished, resulting in loss of optical properties. In order to prevent the metal layer of the glass silver mirror from chemical corrosion and physical damage, primers and topcoats are also required to pro...

AI Technical Summary

Problems solved by technology

[0003] Glass silver mirror mirror back paint as disclosed " coating of glass " of CN1122127A, its composition comprises alkyd resin, amino resin and organosilicon resin, although this mirror back paint has good drying property, acid resistance, alkali resistance and Good hardness and other advantages, but the formed paint film does not have moderate flexibility and moisture resistance, so after a period of use of the glass silver mirror, the back paint of the mirror will peel off, especially at the incision of the glass silver mirror. Optical performance degradation of glass silver mirrors

[0004] Mirror back paint for glass silver mirror as disclosed in CN1371409A "Quick-drying High Solid Content Coating Based on Modified Alkyd Resin" is a composition cured at room temperature of acrylic acid modified alkyd resin. The connection is not complete enough, and the chemical substances are easy to penetrate, which affects the durability of the reflective layer of the glass silver mirror

[0005] Mirror back paint for glass silver mirror as disclosed in CN1621430 "Mirror Back Metal Plating Protective Coating Uses Modified Drying Oil Alkyd Resin and Curtain Shower Coating", is a kind of dry oil modified alkyd resin and then modified acrylic Acid-modified epoxy resin, a large amount of alcohol-etherified melamine resin or urea-formaldehyde resin is used as the cross-linking agent. Although the mirror back paint has good processability and good moisture and heat resistance, the mirror back The paint uses a large amount of alcohol-etherified melamine resin or urea-formaldehyde resin as a cross-linking agent, so the baking temperature of the mirror back paint must be higher than 150°C. High baking temperature will easily cause the silver mirror glass to crack on the assembly line, and the mirror back paint The initial hardness of the mirror back paint is low when it comes off the production line, and the salt spray resistance and corrosion resistance are poor

[0006] To sum up, there are some defects in the performance of glass silver mirror mirror back paint at present, especially in the existing glass silver mirror production line, affected by factors such as glass temperature, drying time and glass running speed, it is necessary to ensure that the glass It is even more difficult to produce the quality of the silver mirror and ensure the durability of the glass silver mirror.