The composite film flexible packaging, which can function as a barrier and can be printed and heat-sealed at the same time, has been widely used in food, medicine, cosmetics and other fields. It has greatly replaced the packaging of glass, tinplate, paper and cardboard, and its superiority is universal. know. However, at present, more than 90% of solvent-based polyurethane adhesives are used in the dry composite manufacturing process of composite films. The largest area of solvent-based polyurethane adhesives is compounding of food packaging and composite paper. The volatilization of a large amount of solvents not only causes environmental pollution, but also residual solvents in food bags can affect the quality and safety of foods. The composite film flexible packaging can not only play a barrier role, but also can be printed and heat sealed at the same time, and has been widely used in food, medicine, cosmetics and other fields. It has greatly replaced glass, tinplate, paper and cardboard packaging, and its superiority is universal. Know. But at present, more than 90% of solvent-based polyurethane adhesives are used in the dry composite manufacturing process of composite films. The largest field of solvent-based polyurethane adhesives is the lamination of food packaging and composite paper. The volatilization of a large amount of solvent not only causes environmental pollution, but also the residual solvent in the food bag will affect the quality and safety of food.
In order to meet the strong needs of customers, winlong adhesive manufacturer has comprehensively upgraded the products, greatly reduced the solvent residue in the composite flexible packaging, and developed W-8830 in cooperation with relevant experts. 8820 Waterborne Polyurethane Coating Adhesive. The adhesive uses water as a solvent and fully meets the food hygiene requirements of today's flexible packaging. At present, developed countries in Europe and the United States have formulated relevant food hygiene regulations, such as FDA of the United States Food and Drug Administration, EU90/128 of the European Union, BgVV of Germany, etc., which clearly stipulate the types of adhesives used in food and drug packaging, but Chemicals not mentioned in the regulations are strictly prohibited. Therefore, the current utilization rate of solvent-based adhesive composite packaging materials in Europe and the United States has dropped from 80% 10 years ago to 30% now. At present, most of the thousands of composite packaging production lines in my country still use solvent-based adhesives. China's exports to Japan, and food products such as tea, mushrooms, and meat from the EU have all been returned due to health and safety concerns. Therefore, food hygiene and packaging not only threaten people's health, but also affect China's export economy. With the continuous improvement of people's awareness of environmental protection, food packaging materials will be more green and environmentally friendly.
In order to completely eradicate the residual solvent hazards of composite flexible packaging, water-based adhesives have become a key topic in domestic adhesive research and development. According to statistics, my country's food composite flexible packaging needs about 50,000 tons of adhesives every year, of which solvent-based polyurethane adhesives account for more than 90%, and solvent-free and water-based composite adhesives are less than 10%. Experts believe that flexible packaging made of solvent-free composite adhesives cannot meet the requirements of boiling and high-temperature cooking, has a narrow application range, and requires special composite equipment, which limits its use.
The water-based composite adhesive of the present invention can be directly applied to dry-type composite devices, and can achieve the same effect as the solvent-based adhesive. Water-based polyurethane adhesive is a polyurethane adhesive that uses water instead of organic solvents. It is an environmentally friendly adhesive. There is no harmful solvent volatilization and no peculiar smell in the production process of composite packaging. Residues are basically eliminated. solvent. The biggest advantage of this water-based adhesive is that it can be used directly, without the need for equipment modification and additional investment in the existing composite film production line of the food packaging plant using solvent-based adhesives, as well as the comprehensive cost of water. The base adhesive is not high. The existing domestic solvent-based adhesives have been widely promoted in domestic enterprises. The main product features are as follows: First, water is a solvent, which is non-flammable, does not pollute the environment, and has good hygienic performance; it is not sensitive to wet working environment, which improves the stability and adaptability of the product; the glue has good fluidity and moderate drying speed. Good compatibility with solvent-based inks or water-based inks; good transparency for composite films; good adaptability to machines; no need to modify the composite machine; glue can be used directly without dilution; smell.
The water-based polyurethane film adhesive developed by winlong adhesive manufacturer will effectively reduce the residual amount of solvent in the composite flexible packaging, and will play a significant role in promoting the use of my country's flexible packaging industry.
