Compounding technology of the hottest solvent-free

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Compounding technology of solventless polyurethane adhesive

I. solventless polyurethane adhesive

dry compounding processing of food packaging composite film materials has used polyurethane solvent adhesive with organic solvent as the medium for a long time. This kind of adhesive has strong adhesive force. High temperature resistance, cooking resistance, and cold resistance of freezing packaging. It can be cured by heat or at room temperature. It also attaches importance to cultivating local professionals, and is easy to operate

however, the use of solvent-based adhesive will leave nonvolatile solvent on the composite film, which may cause pollution to the packaged materials. At the same time, volatile organic solvents pollute the environment and safety problems when used, and the price of solvents rises; The use of solvent based adhesives is limited by the need for energy conservation and other problems

in order to overcome this problem, Herberts in Germany in the 1970s. The company uses polyurethane solvent-free adhesive completely free of organic solvents to manufacture food packaging composite film materials. This technology has been greatly developed, and the problems brought by organic solvent adhesives have been solved. Compared with solvent based adhesives, it has the following advantages:

1. There is no environmental pollution caused by the volatilization of organic solvents

2. the drying section does not need solvent volatilization, which reduces energy consumption

3. There is no danger of fire and explosion, no need for explosion-proof measures of solvents, and no need to choose products according to needs, equipment and warehouse for storing solvents; The self-made products have no problem of residual solvent damage, and eliminate the invasion of solvent to printing ink

4. attach great importance to building energy conservation. Due to the absence of organic solvents, the composite substrate is easy to be damaged by solvents and high-temperature drying, so that the dimensional stability of the composite membrane structure is good

5. the equipment is relatively simple, the floor area is small, and the investment is saved

the technology of solvent-free composite manufacturing composite film packaging materials has become a mature technology after decades of development, and this new processing technology will become prominent with its obvious advantages; It will be gradually recognized and accepted by China. At present; Many domestic adhesive manufacturers are investing more human and material resources to research and develop solvent-free adhesives. It is hoped that China's flexible packaging industry organizations and packaging enterprises can attach importance to and jointly promote the application and development of solvent-free adhesives in composite film packaging materials

second, solvent-free compounding technology

with the continuous development of compounding technology and raw materials such as composite films and adhesives, solvent-free compounding technology is being more and more widely used in flexible packaging compounding. Although compared with solvent-based composite, solvent-free composite is still less used in China, due to its advantages in environmental protection, reducing costs, improving composite speed, solvent-free residue in products, and all aspects of performance of solvent-free composite products are gradually approaching or reaching the level of solvent-based composite products. Therefore, the development of solvent-free composite technology will form a trend, and this technology has a broad market prospect

solvent free compounding has absolute advantages over solvent-based compounding in terms of environmental protection, cost, compounding speed, etc. For the properties of composite products, there is no essential difference between solvent-free composite and solvent-based composite in terms of heat sealing strength and peel strength

solvent free compounding can replace some solvent-based compounding products with high requirements, such as composite membranes requiring pasteurization. Solvent free compounding cannot replace solvent-based compounding in the case of demanding cooking products and contents. Nevertheless, solvent-free compounding can be used for the vast majority of composite products

it is an unshirkable duty for domestic plastic color printing enterprises to vigorously promote solvent-free composite technology. Of course, due to insufficient publicity and other reasons. The promotion of this technology requires a process, but as long as we dare to challenge it, it will eventually be used by us

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