Ying's green packaging material - water soluble plastic packaging film

Water-soluble plastic packaging film as a novel green packaging material is widely used in the packaging of various products in Europe, America, Japan and other countries, such as pesticides, fertilizers, pigments, dyes, detergents, water treatment agents, mineral additives, washing Agents, concrete additives, photographic chemicals, and gardening chemicals. Its main features are:
1. Degradation is complete, and the final products of degradation are CO2 and H2O, which can completely solve the problem of packaging waste disposal;
2. The use of safety and convenience, to avoid direct contact with the user packaged goods, can be used for the packaging of harmful substances on the human body;
3. Good mechanical properties, heat sealable, high heat seal strength;
4. With anti-counterfeiting features, it can be used as the best weapon for anti-counterfeiting of high-quality products, extending the life cycle of quality products. At present, foreign countries mainly include Japan, the United States, and France, which produce and sell such products, such as the United States’ W. T. P company, C. C. I. P company, France's GREENSOL company and Japan's synthetic chemical company.
Domestic Zhuzhou Institute of Technology and Guangdong Zhaoqing Fangxing Packaging Materials Co., Ltd., with the support of the Ministry of Science and Technology of China National Packaging Corporation, have jointly researched and developed water-soluble films and production equipment. They have passed provincial and ministerial level appraisal and are currently in production. Their products are moving into the market. .
First, the main chemical composition of water-soluble packaging film and its environmental characteristics The main raw material of chemical composition water-soluble packaging film is low-alcoholicity polyvinyl alcohol, using polyvinyl alcohol film-forming, water-soluble and degradable, adding various additives, such as surfactants, plasticizers, anti-adhesion Agent and so on.
2. Environmental Characteristics Water-soluble film products are green packaging materials and have been recognized by the national environmental protection agencies in Europe, America, Japan and other countries.
At present, BOD and COD are used as environmental protection indicators at home and abroad. Japan's relevant agencies to determine the biological oxygen demand (BOD) of polyvinyl alcohol is much smaller than the starch, the United States Air Products's biodegradation of Airvol's PVA products can be measured after five days, the amount of BOD is less than 1% of the initial total amount of BOD. Biological tests have shown that polyvinyl alcohol is neither toxic nor inhibits the growth and reproduction of microorganisms, and has no effect on wastewater treatment and environmental hygiene. The study of microbiological decomposition of the relevant departments also showed that the polyvinyl alcohol was almost completely decomposed and the COD was lowered to a very low level.
As far as the degradation mechanism is concerned, polyvinyl alcohol has both water and biological degradation characteristics. It first dissolves in water to form a glue solution and penetrates into the soil, which increases soil stickiness, air permeability and water retention, and is particularly suitable for sand soil remodeling. The PVA in the soil can be decomposed by the strain of bacteria Pseudomonas isolated in the soil. A symbiotic system composed of at least two bacteria can degrade polyvinyl alcohol: one is an active bacterium of polyvinyl alcohol, and the other is a bacterium that produces substances required for PVA-active bacteria. The oxidation of secondary alcohol catalyzes PVA, and then the hydrolase cleaves the oxidized PVA backbone, further degrades, and eventually degrades to CO2 and H2O.
Second, the main properties of water-soluble packaging film 1. The water-soluble film with water content was wrapped in PE plastic to keep its specific moisture content constant. When the water-soluble film is removed from the PE package, its own moisture content changes with the ambient humidity, and its performance also changes.
2. Anti-static water-soluble film is an anti-static film. Unlike other plastic films, it has good anti-static properties. In the use of water-soluble film packaging products, it will not cause its plasticity and static dust-emission performance due to static electricity.
3. Moisture and gas transmission rate Water-soluble films have strong permeability to moisture and ammonia, but have good barrier properties to oxygen, nitrogen, hydrogen, and carbon dioxide gas. These features make it possible to maintain the ingredients and original odor of the packaged product intact.
4. The heat-sealable water-soluble packaging film has a good heat-sealing property and is suitable for resistance heat sealing and high-frequency heat sealing. The heat-sealing strength is related to the conditions such as temperature, humidity, pressure, and time, and is generally greater than 200 g/cm.
5. Mechanical properties Mechanical properties of water-soluble packaging films: elastic modulus 2500-400 kg/cm2, tensile strength 400-200 kg/cm2, tear force 200-50 kg/cm, elongation 150-220 %.
6. Printing performance The water-soluble film can be printed clearly with ordinary printing methods, and the printability is good.
7. Oil and Chemical Resistance Water-soluble packaging film has good oil resistance (vegetable oil, animal oil, mineral oil), fat, organic solvents, and carbohydrates, but strong alkalis, strong acids, chlorine radicals, and others can interact with PVA. Chemical reactions occur, such as borax, boric acid, certain dyes, etc. These substances are recommended not to be packaged in water-soluble film.
8. The water solubility of the water-soluble water soluble film is related to its thickness and temperature. Take a 25 μm thick film as an example, the dissolution time at 20°C is ≤300S, the dissolution time at 30°C is ≤50S, and the dissolution time at 40°C is ≤30S.
Third, the application prospects of water-soluble packaging film Water-soluble film due to environmental characteristics, it has been widely concerned by the developed countries in the world. For example, Japan, the United States, and France have mass-produced and marketed such products, such as the United States’ W. T. P company and C. C. I. Companies such as P company, GR Eensol in France, and Japan's Synthetic Chemicals are also well-known big companies such as Bayet, Henkel, Shell, Agr. Large companies such as Eva have started using water-soluble films to package their products.
In China, the water-soluble film market is emerging. According to relevant statistics, China's annual need for packaging film accounts for 20% of plastic products, which amounts to approximately 309,000 tons. Even if it accounts for 5% of the market, the annual demand will reach 15,000 tons. The current market price: US products for the 13 to 170,000 yuan / ton, Japan's products for 20 to 250,000 yuan / ton, the domestic product sales price is only 40% of the United States, the average selling price of 60,000 yuan / ton, so in The price is very competitive. With the development and progress of society, people are paying more and more attention to protecting the environment in which we live. In particular, China is about to join the WTO, with the developed countries in the world, and the environmental protection requirements for packaging are increasing. As a result, water-soluble packaging films are used in China. The application prospect must be very broad.