The characteristics of China's green environment-friendly ink

In the past 10 years, China's ink industry has achieved rapid development. Especially in recent years, many companies have invested a lot of funds for technological transformation and technological transformation. The level of R&D and manufacturing of inks has been continuously improved, and the use of new materials and new equipment has been shortened. The gap with the world ink companies. At present, most of China's ink companies have achieved substantial improvement in their production technology and product quality, and have met the quality requirements of domestic printing and packaging. China's ink production will continue to grow rapidly. According to incomplete statistics, in 2003 China's ink production has exceeded 300,000 tons, the output is second only to the United States, Japan and Germany, ranking fourth in the world.

As people's demands for quality of life and survival and development of the environment continue to increase, the product packaging market calls for "green packaging materials", that is, to improve environmental performance, choose energy-saving, low-cost, non-toxic, pollution-free, easily degradable pollution-free packaging materials. "Green packaging materials" is the development trend of future packaging printing materials. People are paying more and more attention to them. Printing ink is one of the more serious materials in packaging materials. "Green packaging materials" call for environmentally friendly ink products to meet high-end products. Packaging requirements.

Packaging inks, as an important growth area for global inks, and environmentally-friendly products are popular, therefore, how to reduce the environmental pollution and energy consumption of inks has become the most important development direction of the ink industry.

In China's flexible packaging and printing industry, environmental-friendly inks represented by water-based inks, alcohol-soluble inks, and UV inks are becoming more and more popular among printing companies.

Specifically, in the flexographic printing market, ink and wash inks have been developing at a rapid rate in recent years and have greatly surpassed the tendency of solvent inks, which has advantages in terms of ease of use and simple printing. Now that the flexographic printing industry decides whether to select ink or solvent ink, confidence in ink has risen, allowing more printing work to be done by aqueous flexographic printing. At present, ink users require improved performance mainly in the following two aspects:

First, obtain a stable pH ink system

The ink-manufacturing industry must develop inks with stable PH values ​​during the printing process, and no longer need to detect and adjust the pH during printing.

Second, improve the re-solubility

In the ink printing process, as the amine volatilizes, the resin will gradually solidify, and in severe cases it will even solidify on the printing plate. According to the survey, ink makers have improved the performance of the resin to make it easier to dissolve, which means that the printing system can run longer before cleaning, thus increasing the printing yield.

It is believed that in cooperation with related industries, the ink suppliers will provide better ink and ink, suppliers of printed substrates will provide easier and water-bonded film surfaces, and printer manufacturers will create better solutions for water-based systems. Drying equipment, then the use of ink will continue to grow and will make a greater contribution to reducing VOC emissions.

At present, from the perspective of output and variety of screen printing inks, volatile drying inks also occupy the mainstream position. However, the production of UV inks and water-based inks has been increasing year by year, and the increase is large. It is only a matter of time before the yield exceeds that of the volatile drying inks. In screen printing inks, UV inks and aqueous screen printing inks have jointly occupied a large market.

As the types of homopolymers, prepolymers, and polymerization initiators in UV ink raw materials have increased, the application range of UV inks has become more extensive, and it can be applied to various printing materials for screen printing, and its market share is bound to increase. . At present, foreign water-based screen printing inks account for more than 50% in screen printing inks, because the full-function water-based ink surface is dry 5S, heat-hardened 10S; ultra-fine particles water-based ink can be printed with 500 mesh, the color can be printed in 8 colors and the computer with 6,000 colors Water-based ink (cosmetic grade) VOC content is zero, 50m2 per kilogram water-based ink.

In the aspect of composite film flexible packaging, after years of development, the production process of the composite film has been relatively complete, so there will be no major changes in the near future. As gravure printing has the advantages of exquisite printing quality and high economical efficiency in long-term large-scale printing, it has been widely used in China, and since the inherent characteristics of water-based inks can only be applied to flexographic and relief printing, the cost of UV inks is relatively high. High also makes it very limited in gravure printing. Therefore, alcohol-soluble inks with low VOC emissions are currently the only products that meet environmental requirements and have a very broad market prospect. As the existing production process of composite ink is more or less accompanied by the generation of waste, it is necessary to make improvements in the production process to meet the needs of environmental protection. This is mainly reflected in:

First, in the process of plastic gravure printing, benzene-free inks (mainly alcohol-soluble inks) are used instead of current benzene-based inks.

Second, the dry process, the solvent used is ethyl acetate. Although the “Emission Standards for Integrated Air Pollutants Emissions” (G816297-1996) does not specify the emission of ethyl acetate gas, the gas has harmful effects on the human respiratory tract and liver. Therefore, it should be used as little as possible, or it should be considered for recycling. Nowadays, companies have developed alcohol-soluble polyurethane adhesives that use ethyl alcohol as a solvent instead of ethyl alcohol. The adhesive uses alcohol as a solvent, is non-polluting, has good compatibility with alcohol-soluble inks, and has a low cost and will be widely used. Applications.

When using alcohol-soluble gravure inks, note the following:

First, store at a relatively low temperature, and fully stir the ink before use to make it have good flow properties.

Second, alcohol-soluble ink in the viscosity, thick, dry, etc., should meet the requirements of the machine. In general, ethanol can be used as a quick-drying diluent and butanol as a slow-drying diluent. When the speed of the printing press is high or the climate is cold and dry in winter, a quick-drying agent may be added to accelerate the drying.

Third, the alcohol-soluble ink can be mixed with each other to adjust a variety of color, but can not be mixed with other types of ink, in particular, can not be mixed with the chlorinated polypropylene system ink, so as to avoid the phenomenon of resin precipitation.




Source: 21st Century Fine Chemicals Network

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