With the development of economy, environmental pollution has attracted more and more attention. For the flexible packaging industry. Solvent emissions from printing and compounding processes have been severe. In the complex process. Although ethyl acetate is not toxic. However, it still belongs to substances that control emissions. After China joined the book organization, the developed countries set more and more technical barriers to China's food exports. For soft-packed foods, it is not only required that the food itself meet Taiwan's national standards. Moreover, the production processes and raw materials for flexible packaging must meet the international standards. Currently. The ester-soluble polyurethane adhesives commonly used in China's composite flexible packaging are limited by developed countries because they contain traces of free isofluoride ester monomers. The adhesives used in soft packaging will gradually develop in the direction of water-based and solvent-free. . Under the current technical conditions, water-based adhesives have a poor effect on plastics, aluminum foils and other materials. After nearly one year of development, New Oriental Group Huaguang Resins Co., Ltd. has developed the U-7750m-100 Alcohol Solubility Polyurethane Adhesive to meet the requirements of practicability, safety, and derivative.
Alcohol-soluble polyurethane adhesives are more favorable than ester-soluble polyurethane adhesives for environmentally friendly alcohol-soluble polyurethane adhesives. The main agent and curing agent are both free of isocyanate (a NC01 and free TD1, so are harmless during the production and application of composite films. Hygienic is an environment-friendly polyurethane adhesive, and ester-soluble polyurethane adhesives commonly used in the country contain more free TD1 in the curing agent, and the production process and construction process are harmful to the health of workers. In the process of use, the product may be hydrolyzed, releasing a carcinogenic substance "IDA."
In recent years. The rapid development of China's plastic flexible packaging industry has delayed the technical progress in the food, daily chemical, and pharmaceutical industries. The progress of these industries has stimulated the market demand for plastic flexible packaging. Industrial packaging, household daily-use packaging, clothing packaging, and pharmaceutical packaging also use plastic flexible packaging. In response to this, the greening of plastic flexible packaging has also become an inevitable trend.
Currently used in Europe and the United States in the packaging industry used adhesive agent. Environmentally friendly products have been commonly used, and alcohol-soluble polyurethane adhesives are among them. Although some developed countries in Europe and the United States have begun to use a large number of two-component solvent-free adhesive viscous, but due to factors such as the use of cost. About 40% still use solvent-based adhesives, of which more than 95% are alcohol-soluble adhesives. Previously, alcohol-soluble polyurethane adhesives had no official products in the country, and the demand was almost entirely dependent on Jin 121, so there were only a few foreign and joint venture laminating packaging companies in China. It is difficult to promote the alcohol-soluble polyurethane adhesive into Vl.
   Alcohol-soluble polyurethane adhesives have been successfully developed and applied in foreign countries in the 1980s, and development and research work in China is currently in its infancy. In recent years, some domestic manufacturers have begun to produce alcohol-soluble polyurethane adhesives, such as the Beijing Chemical Research Institute, Zhejiang New Oriental, etc., which has formed a market size of about l000t. In the future, its market coverage will surely continue to increase.