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Plastic products are everywhere in our lives, and plastics are also favored by the packaging industry. In the process of making flexible packaging materials for plastic products, a variety of organic solvents, including toluene, ethyl acetate, acetone, methyl ethyl ketone, isopropanol, methanol, etc., are used, which are derived from inks and binders.
For polyethylene and polypropylene films, toluene, ethyl acetate, etc. are good solvents for polyolefins (the solubility parameters are similar), that is, the interaction between polyolefin and toluene and ethyl acetate is very strong, even After the printed film is in the drying tunnel, these organic solvents are also difficult to be desorbed from the inside of the polyolefin film, resulting in excessive residue of toluene and ethyl acetate in the packaging material, causing food contamination and endangering people's health.
In the production of flexible packaging bags, in order to reduce residual organic solvents such as toluene, the usual method is to increase the temperature of the drying tunnel and increase the air volume when preparing the composite membrane, and also to adopt a method of placing in the curing chamber, sometimes even using multiple rewinding. Methods. But these means of reducing solvent residues are passive.
Soft packaging materials with low adsorption properties for solvents have been developed abroad, but research in this area in China is blank. If we make some changes in the polarity of the polyolefin resin, such as adding a small amount of high-polarity additive (nano-modifier), increase the solubility parameter of the polyolefin, and increase the solubility of the resin material with the solvent of toluene and ethyl acetate. The difference in the degree parameter reduces the interaction between the polyolefin and the solvent molecules. The organic solvent cannot enter the deep layer of the polyolefin film, and the solvent adsorbed on the surface of the film can be easily removed in the drying tunnel.
As plastic products have been integrated into our lives, as consumers, we must pay more attention to the safety of plastic products and avoid harm to our bodies.