Analytical VOC zero-emission environmentally friendly water-based ink

With the improvement of people's living standards and health, the pursuit of low-toxicity, environmental protection and health products, our ink market has undergone certain changes, and the water-based market is gradually improving. At present, water-based inks are mainly flexible and gravure printing . Most of these two types of printing are food packaging , tobacco and alcohol, pharmaceutical factories, and children's toys occupying a considerable market. About 95% of flexible printing and gravure printing in the United States and Europe are water-based, while China currently accounts for only 3%.

Water-based inks have been born in this context. In the field of printing, in order to eliminate the VOC (low-boiling organic compounds) released by solvent-based inks, that is, to meet the requirements of EPA to reduce or eliminate VOCs, chemical engineers have continuously developed high solids. Sub-coatings, powder coatings, UV-curing coatings, water-based coatings, etc., these inks have greatly reduced VOC emissions, and some even eliminated VOC emissions.

Composition of water-based ink

The water-based ink is made by a combination of aqueous resin, pigment, solvent and auxiliary agent. The water-soluble resin mainly functions as a binder in the ink to uniformly disperse the pigment particles, so that the ink has a certain fluidity, and the adhesion to the substrate material is generated, so that the ink forms a uniform film layer after printing.

Water-based ink characteristics

1. Water-based ink is a new type of environmentally-friendly printing ink with good adhesion, good flexibility, good elasticity, anti-sticking, water-resistant, printing, and super-networking, and high solid content.

2, non-flammable, stable ink, non-corrosive printing substrate, prevent color migration, strong water resistance, and rapid drying. It can not only reduce the risk of danger caused by static electricity and flammable solvents, but also reduce the residual toxicity of the printing surface, and it is convenient to clean the printing equipment , so it is especially used in packaging industries such as food, beverage and medicine.

3, water-based ink solvent is water and a small amount of alcohol, significantly reducing VOC emissions, can prevent air pollution, does not affect human health, in direct contact with the human body, such as: T-shirts and other pure cotton, elastic fabrics, The insole printing industry also has a wide range of uses, is recognized worldwide as an environmentally friendly material, and is currently recognized by the American Food Association for all printing inks.

4. In terms of cost, due to the rising price of organic solvents, the cost of using solvent-based inks is increasing. The solvent and washing network of water-based inks mainly use tap water, and the cost of use will be much lower than that of solvent-based inks.

Water-based ink instructions:

Applicable mesh: 40-100T (water-based screen printing)

Applicable squeegee: 65-70 degree polyester squeegee or water-based special squeegee is recommended

Coating area: 25-35 square meters / kg (77T polyester flat or glossy)

Thinner: neutral water

Washing water: ordinary tap water

Water-based ink formulation requirements

According to different printing requirements, the viscosity of the ink should be properly adjusted before use. When adjusting, pay attention to the neutrality of the added water, otherwise it will affect the viscosity and drying speed of the aqueous ink. At the same time, the amount of diluent (water) added should not exceed 3%, otherwise the color density of the ink may be lowered, which may also have a significant effect on the pH of the aqueous ink.