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Measuring the viscosity of water-based varnish can determine the amount of supplemental water

Information Sources:Internet posted on:2020-06-17

Varnish, also called varnish, is a kind of synthetic resin. Water-based varnish is a kind of versatile varnish. It is colorless, odorless, transparent in appearance, non-toxic, and low in cost. These characteristics are difficult to match with other solvent varnishes. Adding other main agents and gradually changing its gloss, abrasion resistance and chemical resistance. The applicability of water-based varnish in packaging printing is very good. Today we will talk about the effect of the quality of water-based varnish on packaging. 1. The curing mechanism of water-based varnish After the wetting process covers the surface of the printed product, after the diffusion and penetration, the free wear-resistant particles and emulsion molecules in the varnish are combined with the water-soluble resin to form a wet film . After drying to eliminate moisture, the film-forming resin and emulsion solidify into a protective film, and at the same time, the wear-resistant particles are also fixed in the film. 2. How to guarantee the stability of the quality of water-based varnish. Of course, it is also necessary to carry out incoming inspection to ensure the stability of the batch quality. The incoming inspection items are the same as the solvent-based varnish, that is, viscosity, solid content and PH value. Generally, water-based varnish can be used directly on the machine, and the volatility of water is much weaker than that of Tianna water, so the quality of water-based varnish is relatively stable. However, if it is circulated for a long time, especially in the high-temperature drying season, the water in the oil and water will also evaporate a lot, so the amount of supplemental water can also be determined by measuring the viscosity. In addition, the operator must also adjust the speed, roller distance, and drying tunnel temperature according to different situations, which is also an important part of ensuring the stability of the water-based glazing quality. 3. Environmental protection and characteristics Water-based varnish uses water as a solvent, has little irritating odor, is harmless to human body and harmless to environment. Moreover, the water-based varnish is non-flammable and is very stable during storage, transportation and use. Due to its excellent environmental protection and characteristics, it is gradually replacing solvent-based varnish as the main force of glazing materials. In summary, the solvent of water-based varnish is mainly water, which is not volatile. Varnish spreads in water to form a wet film, which solidifies into a protective film after drying. It is necessary to check the glazing quality of water-based varnish, mainly to determine the amount of water replenishment by measuring the viscosity. Water-based varnish is non-toxic, harmless, environmentally friendly, and not flammable, which makes it very stable during transportation.
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