The water-based varnish mainly consists of three parts. As a new type of green and environmentally friendly printing material, it does not have much advantages compared with similar solvents in the market, but the excellent characteristics of environmental protection and greening are his capital. Aqueous varnish is usually composed of synthetic resin, which affects and dominates the physical properties of the deep layer, thereby affecting the gloss and dryness when glazing. Auxiliary agents can improve the physical and chemical properties of water-based broad oil, and can affect its processing adaptability within the prescribed metering.
1. Main agent.
The main agent of water-based varnish is a film-forming resin, usually a synthetic resin, which affects and controls various physical properties of the deep layer and the glazing quality of the film layer, such as gloss, adhesion, and dryness. There are many types of water-based film-forming resins, but the most commonly used at home and abroad are acrylic resin copolymer resins. The performance of the copolymer resin depends on the composition of the monomer and the synthesis process. Water-based acrylic copolymer resin has a series of excellent properties such as good film-forming, good gloss, high transparency, fast drying speed, wear resistance and water resistance, and is widely used in water-based varnish.
The additive is to improve the physical and chemical properties and processing characteristics of the water-based varnish. The commonly used additives are: curing agents, surfactants, defoamers, desiccants, adhesion promoters, wetting and dispersing agents and other additives. There are many types of additives, depending on the type of varnish. However, the amount of various additives should not exceed 5% of the total amount, otherwise it will affect the processing adaptability of the varnish.
The main role of the solvent is to disperse or dissolve synthetic resin and various additives. The solvent of water-based varnish is mainly water, colorless, odorless, non-toxic, wide source, low price, almost zero volatility, and very good leveling property. However, there are also deficiencies, such as slow drying speed, easy to cause unstable product size and so on. Therefore, add ethanol in an appropriate amount to improve the drying performance of the aqueous solvent and improve the processing adaptability of the aqueous varnish.
The stability and fluidity of water light solvents require excellent performance, and are widely used in water-based varnishes. In order to be able to decompose and fuse synthetic resins, more additives are often used to help decomposition, but for additives we There will be certain requirements. The measurement cannot exceed 5% of the total amount, otherwise it will affect his processing adaptability. Generally speaking, the solvent of water-based varnish is mostly colorless, odorless and non-toxic. Due to its wide use frequency and low manufacturing cost, the price of other products is low.