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This material has unique advantages as a package for articles requiring use in aqueous solutions or dispersions as well as powdery, irritating, toxic articles. For example, bleaching powders, laundry detergents, and pesticides such as anti-caries agents, growth promoters, insecticides, nematicides, and disinfectants, etc. are used for laundry. Packages made with this film can be quickly dissolved in cold water without using hot water. In the preparation of pesticides, the person who uses the drug can not be in direct contact with the drug, so as not to endanger the health, this new package can not only avoid this danger, and enable the operator to obtain accurate dosage without direct contact with the contents of the package. , And to make such items of waste packaging and environmental pollution problems and other issues can be well resolved.
This thin film material is a polymer having a relative molecular mass of 80,000 or more on average and has a film thickness of 2 to 5 μm. This newly invented plastic film contains bubbles and is evenly distributed throughout the film, accounting for 80% to 90% of the entire volume of the film, and the diameter of each bubble is less than 1/3 of the film thickness. Among them, polyvinyl alcohol is saponified from polyvinyl acetate, and the maximum degree of hydrolysis reaches 90%. The solubility of this polymer in cold water depends on the relative molecular mass. A polymer film with a low molecular weight of 20,000 can be dissolved in 50°C water for about 30 minutes. For a film with a high relative molecular weight of 80,000, it takes more than 72 hours.
The cold water soluble foam plastic film is manufactured by first dissolving the polymer in water to form an aqueous solution, filling the solution with air or other gas to form bubbles, and stirring sufficiently so that the formed bubble diameter is less than 1/3 of the film thickness. The bubble-bearing polymer solution was cast on a 0.25 mm thick unstretched polyester film on a flat glass plate, and was peeled off.
Membranes made using this new inventive method can be packaged using a variety of conventional plastic packaging manufacturing machines. This kind of packaging, before using its contents, can not contact with water, generally use polyethylene, polypropylene, cellophane or kraft paper and add a layer of moisture-proof packaging.
US developed successful cold water soluble foam plastic film
The United States recently announced that the agency has successfully developed a cold water-soluble foam film made of polyvinyl alcohol, polyvinylpyrrolidone and a mixture of the two.