Application of the hottest environmental protectio

2022-10-20
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Application of environment-friendly compounding technology - water-based adhesive compounding (Part 1)

Abstract: with the development of social economy and the improvement of people's living standards, consumers are increasingly concerned about food safety and hygiene. As a necessary adhesive for food packaging, water-based adhesive will be selected by more food and pharmaceutical packaging manufacturers with its health, safety, environmental protection and other properties

key words: water-based adhesive composite technology, environmental protection application, food packaging, social and economic living standards, pharmaceutical packaging, consumer adhesives

with the development of social economy and the improvement of people's living standards, consumers are increasingly concerned about food safety and health. As a necessary adhesive for food packaging, water-based adhesive will be selected by more food and pharmaceutical packaging manufacturers with its health, safety, environmental protection and other properties

with the development of social economy, the flexible packaging industry has developed rapidly, and the improvement of people's living standards has paid more and more attention to food safety and hygiene. Most plastic packaging materials are used for food packaging, so the health, safety and environmental protection of plastic packaging are closely related to the health of large consumers. At present, domestic food packaging composite films are basically compounded with solvent adhesives, so there will be solvents in the compounding process, and the results can be compared with each other, volatilization and a small amount of solvent residues. Food packaging with high solvent residues will produce peculiar smell in the packaging and deteriorate the food. Solvent volatilization in the compounding process not only pollutes the environment, but also endangers the health of on-site operators. Therefore, how to reduce the amount of solvent volatilization and solvent residue in the process of food packaging and compounding, while ensuring the quality of products, reducing costs, improving enterprise efficiency, and seeking a way that is in line with the environmental protection and health of food packaging, but also adapt to the development of enterprises has become the goal of domestic food packaging enterprises. Hangzhou dingzheng packaging materials Co., Ltd. has finally found a new way of hygienic and environmental protection food packaging compound - water-based adhesive compound after years of exploration, long-term experiments and various attempts

composite mechanism

aqueous adhesive refers to a composite adhesive that can be used directly with water as the main solvent. The company selects Rohm Haas water-soluble acrylic composite adhesive. The water-based adhesive takes the intersection of acrylic acid and polyurethane as the adhesive, which has good heat and medium resistance. Acrylic lotion has good affinity with most composite substrates. If the dust on the measuring instrument has many affinities, the high molecular weight polymer ensures high shear strength and initial peel strength. The film forming principle is shown in Figure 1

experimental analysis

the cost of water-based adhesive is cheaper than that of solvent-based adhesive; There is no solvent emission during the compounding process, and there is no solvent residue after compounding, which is safe, hygienic and environmental friendly; After compounding, the product does not need to be matured, which saves energy; Composite direct slitting can shorten the production cycle, reduce the turnover space and improve the production efficiency. See the performance comparison chart of composite adhesive for details:

the operating conditions of water-based adhesive are as follows:

the surface energy of substrate is greater than 38 dyne/cm

1 80-200 online offset plate

solid content: 40% - 50%

oven temperature: 75 ℃, 80. C. 85 ℃

composite temperature: 85 ℃

operating speed: 100-250m/min

see Figure 2 for the composite diagram

precautions for water-based adhesive compounding

corona treatment of the substrate is recommended to ensure that the surface of the substrate can meet the compounding requirements; Gently stir for 5 minutes before use to make each component of the glue mix evenly to achieve the best composite effect; It is recommended to avoid diluting the adhesive, so as not to affect the appearance of the composite film; The upper offset plate pit should be shallow and the opening should be large, so that the glue can contact the substrate as much as possible; When compounding, open the leveling rod to ensure that the adhesive coating is uniform and continuous; Keep the offset plate rotating slowly during shutdown, and lift the scraper to avoid blocking the plate; The storage temperature should be controlled between 5 ℃ and 30 ℃, and do not pollute dirt and foreign matters

when compounding, the oven temperature reaches the set temperature and starts up. The inlet and exhaust air of the oven is turned on at the maximum, so as to ensure that the adhesive adopts the customized modification mode to develop the material coating and the drying during the large tonnage material mechanics experiment

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