Present situation and Prospect of the most popular

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Status and Prospect of water-soluble plastic packaging film as a new green packaging material, water-soluble plastic packaging film 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, detergents, concrete additives, photographic chemicals and gardening care chemicals. Its main features are:

1. it is degraded thoroughly. The final products of degradation are CO2 and H2O, which can completely solve the problem of packaging waste treatment; 2. it is safe and convenient to use, avoiding users' direct contact with the packaged goods, and can be used for packaging goods harmful to human body; 3. good mechanical properties, heat sealing and high heat sealing strength; 4. with anti-counterfeiting function, it can be used as the best weapon for anti-counterfeiting of high-quality products and prolong the life cycle of high-quality products. At present, such products are mainly produced and sold in Japan, the United States and France, such as w.t.p company, c.c.i.p company in the United States, greensol company in France and synthetic chemical company in Japan

with the support of the science and Technology Department of China Packaging Corporation, Zhuzhou Institute of technology and Guangdong Zhaoqing Fangxing packaging materials Co., Ltd. jointly developed water-soluble films and production equipment, which have passed the provincial and ministerial appraisal. At present, they have been put into production, and their products are going to the market

I. main chemical components of water-soluble packaging film and its environmental protection characteristics

1. chemical components the main raw material of water-soluble packaging film is polyvinyl alcohol with low alcoholysis. Various additives, such as surfactants, plasticizers and anti adhesion agents, are added by using the film-forming, water solubility and degradability of polyvinyl alcohol

2. environmental protection characteristics water soluble film products are green packaging materials, which have been recognized by national environmental protection departments in Europe, America, Japan and other countries

at present, biological oxygen demand (BOD) and chemical oxygen demand (COD) are mainly used as environmental protection indicators at home and abroad. The relevant Japanese departments measured that the biological oxygen demand (BOD) of polyvinyl alcohol was much smaller than that of starch. After 5 days of biodegradation of the PVA product of airvol, the amount of BOD measured by the American air products company was lower than 1% of the initial total BOD. Through biological tests, it has been proved that polyvinyl alcohol is non-toxic and will not prevent the growth and reproduction of microorganisms. It has no impact on wastewater treatment and environmental health. Major countries in the world attach great importance to the development of graphene related industries. The microbial decomposition test of relevant departments also showed that polyvinyl alcohol was almost completely decomposed, resulting in a very low COD

in terms of degradation mechanism, polyvinyl alcohol has two degradation characteristics of water and biology. First, it dissolves in water to form glue solution and infiltrates into the soil, which increases the soil's stickiness, permeability and water retention. It is especially suitable for sand soil transformation. PVA in soil can be decomposed by bacteria isolated from soil, Pseudomonas. The symbiotic system composed of at least two bacteria can degrade polyvinyl alcohol: one is the active bacteria of polyvinyl alcohol, and the other is the bacteria that produce the substances required by the active bacteria of PVA. The secondary alcohol oxidation reaction enzyme catalyzes polyvinyl alcohol, and then the hydrolase cuts off the oxidized PVA main chain for further degradation, and finally it can be degraded into CO2 and H2O

II. Main properties of water-soluble packaging film

1. the water-soluble film rolled with water content is packed with PE plastic to keep its specific water content unchanged. When the water-soluble film is taken out of the PE package, its water content changes with the environmental humidity, and its performance also changes according to German reprap

2. anti static accelerates the development of new material industry. Electric water-soluble film is a kind of anti-static film, which is different from other plastic films and has good anti-static property. In the process of using water-soluble film to pack products, it will not reduce its plasticity and electrostatic dust trapping performance due to static electricity

3. water and gas permeability the water-soluble film has strong permeability to water and ammonia, but good barrier to oxygen, nitrogen, hydrogen and carbon dioxide. These characteristics make it possible to keep the ingredients and original smell of the packaged products intact

4. heat sealing water-soluble packaging film has good heat sealing property, which is suitable for resistance heat sealing and high-frequency heat sealing. The heat sealing strength is related to temperature, humidity, pressure, time and other conditions, generally greater than 200g/cm

5. mechanical properties mechanical properties of water-soluble packaging film: elastic modulus 2500~400kg/cm2, tensile strength 400~200kg/cm2, tear force 200~50kg/cm, elongation 150~220%

6. printing performance the water-soluble film can be clearly printed by ordinary printing methods with good printability

7. oil resistance and chemical resistance water-soluble packaging film has good oil resistance (vegetable oil, animal oil, mineral oil), fat resistance, resistance to organic solvents and carbohydrates, but strong alkali, strong acid, chlorine free radicals and other substances can react with PVA, such as borax, boric acid, some dyes, etc. It is recommended not to package such substances with water-soluble film

8. the water solubility of water-soluble films is related to their thickness and temperature, with a value of 25 μ For m-thick films, the dissolution time is ≤ 300s at 20 ℃, ≤ 50s at 30 ℃ and ≤ 30s at 40 ℃

III. application prospect of water-soluble packaging film. For example, Japan, the United States and France have produced and sold such products in large quantities, such as w.t.p and c.c.i.p in the United States, greensol in France and synthetic chemistry in Japan. Their users are also some famous large companies, such as bayet (Bayer), Henkel (Henkel), shell (shell), agr.eva (aegfu) and other large companies have begun to use water-soluble films to package their products

in China, the water-soluble film market is rising. According to relevant statistics, China needs to make further progress in the construction technology of packaging sheet every year. The film accounts for 20% of plastic products, about 309000 tons. Even if it accounts for 5% of the market, the annual demand is 15000 tons. At present, the market price is 130000 ~ 170000 yuan/ton for American products and 200000 ~ 250000 yuan/ton for Japanese products. The sales price of domestic products is only 40% of that of the United States, with an average price of 60000 yuan/ton, so it has strong competitiveness in price. With the development and progress of society, people pay more and more attention to protecting the environment we rely on. Especially, China is about to join the WTO and connect with the developed countries in the world. The requirements for environmental protection of packaging are increasing day by day. Therefore, the application prospect of water-soluble packaging film in China must be very broad

source: China Gold Rush business

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