Water Based Varnish Thinner

Water based varnish diluent is used for water-based varnish dilution. It can be fully coated or partially coated on printed matter, which can protect printed matter and enhance luster. The advantages are non-toxic, no environmental pollution, no solvent volatilization (low residual odor), which can improve the production environment and is conducive to the health of operators; And can meet the environmental protection import standards of Europe and the United States. Water based varnish has fast conjunctiva, strong wear resistance, not easy to turn yellow and high gloss. It is widely used in all types of paper. The specially formulated water-based varnish can be used for non absorbent materials, such as gold and silver card, pet, PP, PVC and so on.

Water based varnish is generally composed of 80-90 percent water-based resin and 10-20 percent other additives. After coating and polishing, a thin layer of polymer is left on the surface of the substrate, which gives different characteristics to the coating due to different formula combinations. Such as high gloss, matte, abrasion resistance, etc.

Waterborne resin is the main component of Waterborne Varnish. It determines and affects the characteristics of water-based varnish, such as gloss, adhesion, wear resistance, dryness and so on. Therefore, the proper selection of water-based resin is the key to the successful blending of water-based varnish.

There are many kinds of resins, including waterborne rosin modified maleic acid resin, waterborne polyurethane resin, waterborne acrylic resin, waterborne alkyd resin, waterborne amino resin, etc. For water-based varnish, the selected resin should have the characteristics of easy dissolving salt, good water release, good gloss after film formation, heat resistance, good chemical resistance and fast drying speed, while the water-based acrylic copolymer resin can meet the requirements of printing polishing to the greatest extent. Therefore, when preparing water-based varnish, The copolymer resin of waterborne acrylic acid system has become our best choice.

Waterborne acrylic copolymer resin can be divided into aqueous acrylic resin solution, water-borne acrylic dispersion and acrylic emulsion. Acrylic emulsion can be divided into film acrylic emulsion and non film acrylic emulsion. The performance of waterborne acrylic copolymer resin is affected by monomer composition. Properties and synthesis process. Some monomers can improve gloss and hardness, while others can provide chemical resistance and adhesion. A large number of experiments have proved that water-based varnish made of water-borne acrylic acid solution and acrylic emulsion is scientifically perfect.

Other additives also play an important role in improving the performance of Waterborne Varnish. Such as leveling agent, wetting agent, defoamer, wear-resistant agent, etc. Leveling agent is to improve the fluidity, prolong the leveling time, help the coating form a flat film after drying, and avoid water lines and stripes. The wetting agent mainly reduces the surface tension of the aqueous varnish system and improves the wettability of the coating to the substrate surface. Defoamer can just inhibit and eliminate the foaming of Waterborne Varnish in circulation system and avoid excessive foam operation. The anti-wear agent can improve the anti-wear, scratch resistance and smoothness of water-based varnish. In addition, adding a small amount of auxiliary solvent in the formula can make the components of aqueous varnish more miscible with each other, reduce the cohesion of the system and improve the glazing adaptability.

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