Water-based varnish for green and environmentally friendly paper printing.

Green printing refers to printing methods and related industrial behaviors that do not damage the ecological environment, do not threaten human health, and save resource consumption. Green printing, as the primary measure to promote its development, holds special significance. Textbooks are mostly used by students and are one of the items they come into contact with the most every day. It is imperative to carry out green printing of teaching materials.

At present, due to the uneven overall level of the industry and people's weak awareness of safety and environmental protection, there are numerous problems in the printing of teaching materials. The "aroma of ink" is no stranger to everyone. Why does ink or ink give off a "fragrance"? I believe that people in the printing industry can all explain this. It is precisely the diffusion of toxic chemical elements contained in the ink. Textbook printing inks often contain volatile organic solvents such as ethanol, isopropanol, butanol, propanol, methyl ethyl ketone, ethyl acetate, toluene, and xylene. These organic solvents are constantly evaporating during the printing process, especially benzene solvents, which are toxic and have a strong pungent smell. Although most of the solvents in the ink will be eliminated after it dries, some will still remain. Reading books printed with such ink for a long time will cause the inhaled gas to affect the central nervous system of the brain and pose a great threat to health. Meanwhile, the EVA hot melt adhesive and solvent-based instant coating lamination processes commonly used in the post-printing binding of general textbooks also contain some volatile organic solvents, which not only harm students' health but also damage the environment. Using green and environmentally friendly water-based varnish will not cause these problems.

Apart from "odors", there are also other "killers" hidden that affect students' health and damage the environment. Ink pigment particles are fine and have a strong adsorption capacity. They contain heavy metal elements such as lead, chromium, cadmium and mercury, all of which have certain toxicity. Emissions not only cause damage to the natural environment, but also lead to chronic poisoning in the human body or enter the brain tissue through the bloodstream, causing brain damage. When inks containing these heavy metal elements come into close contact with the human body, especially students and children, the consequences can be imagined. It is recommended to use green and environmentally friendly water-based varnish.

In addition, during the production process of textbook paper, a large amount of additives, brighteners, fluorescent agents, etc. are usually added, which increase the whiteness of the paper. Long-term reading can cause visual fatigue, especially for primary and secondary school students, reading can lead to a rapid decline in eyesight. Moreover, the wastewater discharged after adding additives also has a significant impact on the environment.

Eliminate pollution and ensure human health and safety! Green and environmentally friendly water-based varnish.