The most popular green ink in China

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The characteristics of green and environmental friendly inks in China over the past 10 years, China's ink industry has developed rapidly. In particular, in recent years, many enterprises have invested a lot of money in technical transformation and process transformation. The R & D and manufacturing level of inks have been continuously improved, and the use of new materials and equipment has shortened the gap with the world's ink enterprises. At present, the production technology level and product quality of most ink enterprises in China have been substantially improved, and have been able to meet the quality requirements of domestic printing and packaging. China's ink output will continue to grow rapidly. According to incomplete statistics, in 2003, China's ink output has exceeded 300000 tons, second only to the United States, Japan and Germany, and the same batch of joints are scattered in no more than three floors, ranking fourth in the world

with the continuous improvement of people's requirements for the quality of life and the survival and development environment, the product packaging market calls for "green packaging materials", that is, to improve environmental protection performance, and to select pollution-free packaging materials that are energy-saving, low consumption, non-toxic, pollution-free and easy to degrade. "Green packaging materials" is the development trend of packaging and printing materials in the future, and people pay more and more attention to it. Printing ink is one of the most polluted raw materials in packaging materials. "Green packaging materials" calls for environmental friendly ink products to meet the packaging requirements of high-end products

packaging ink, as an important growth field of global ink, and environmental friendly products are becoming popular. Therefore, how to reduce the environmental pollution and energy consumption of ink has become the most important development direction of the ink industry

in China's flexible packaging printing industry, at present, environmental friendly inks represented by water-based inks, alcohol soluble inks and UV inks with the above basic configuration of about 30000 yuan are increasingly being ignored by printing manufacturers

specifically, in the flexographic printing market, ink has been developing rapidly in recent years and has a tendency to catch up with solvent ink. It has advantages in ease of use and simple printing. Now, when the flexographic printing industry decides whether to choose water ink or solvent ink, its confidence in water ink has increased, making more printing work completed by water-based flexographic printing. At present, the performance that ink users require to improve is mainly in the following two aspects:

first, to obtain a ink system with stable pH value

the ink manufacturing industry must develop ink with stable pH value in the printing process, and there is no need to detect and adjust pH value in the printing process

II. Improve re solubility

in the process of ink printing, with the volatilization of amine, the resin will gradually solidify, and even solidify on the printing plate. According to the survey, ink manufacturers have improved the performance of the resin to make it easy to dissolve, which means that the printing system can run longer before cleaning, thus increasing the printing output

I believe that with the mutual cooperation and joint efforts of relevant industries, that is, ink suppliers provide better ink, printing substrate suppliers provide film surface that is easier to combine with water, and printing machine manufacturers produce better drying equipment for water-based systems, the use of ink will continue to grow and make greater contributions to reducing VOC emissions

at present, in terms of output and varieties of silk printing inks, volatile dry inks still occupy the mainstream position. However, the output of UV ink and water-based ink has increased year by year, and the growth rate is large. It is only a matter of time before their output exceeds that of volatile dry ink. In silk printing ink, UV ink and water-based printing ink have jointly occupied a large market

due to the increase in the types of homogeneous polymers, prepolymers and polymerization initiators in the raw materials of UV inks, the application scope of UV inks is more extensive, which can be suitable for printing with various substrate materials, and its market share is bound to increase. At present, foreign water-based screen printing inks account for more than 50% of the printing ink, because the surface of the full-function water-based ink is dry for 5S and heat hardened for 10s; The ultra-fine water-based ink can be printed with 500 meshes, 8 colors can be printed and 6000 colors can be prepared by computer; The VOC content of water-based ink (cosmetic grade) is zero, and 50m2 can be printed per kilogram of water-based ink

in terms of composite film flexible packaging, after years of development, the production process of composite film has been relatively perfect, so there will be no major change in the near future. Because gravure printing has the advantages of exquisite printing quality and high economy in large-scale printing for a long time, it has been widely used in China. However, due to the inherent characteristics of water-based ink, it can only be used in flexo and relief printing. The high cost of UV ink also limits its application in gravure printing. Therefore, the alcohol soluble ink with low VOC emission is the only product that meets the environmental protection requirements at present and has a broad market prospect. As the existing production process of composite ink is more or less accompanied by the production of waste, it is necessary to make some improvements in the production process to meet the needs of environmental protection. This is mainly reflected in:

I. in the process of plastic gravure printing, benzene free ink (mainly alcohol soluble ink) is used to replace the current benzene soluble ink

II. The solvent used in the dry compounding process is ethyl acetate. Although the integrated emission standard of air pollutants (g816297-1996) does not specify the emission of ethyl acetate gas, the gas is harmful to human respiratory tract and liver, so it should be minimized or recycled. At present, some enterprises have developed alcohol soluble polyurethane adhesive which uses industrial alcohol instead of ethyl acetate as the solvent for checking the oxygen index before the commencement of the project. The adhesive uses alcohol as the solvent, has no pollution, has good compatibility with alcohol soluble ink, and the cost is not high. It will be widely used

when using alcohol soluble gravure printing ink, pay attention to the following matters:

first, store it at a lower temperature, and fully stir the ink before use to make it have good flow performance

II. Alcohol soluble inks should meet the requirements of computer application in terms of viscosity, thinness and dryness. Generally speaking, ethanol can be used as fast drying diluent and butanol as slow drying diluent. When the speed of the printing press is high or the weather is cold and dry slowly in winter, a quick drying agent can be added to accelerate its dryness

III. alcohol soluble inks can be mixed with each other to adjust various colors, but cannot be mixed with other types of inks, especially with chlorinated polypropylene inks, so as to avoid resin precipitation

source: 21st century fine chemicals

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