PVA water-soluble film has a wide range of uses, a very broad market, and has environmental protection characteristics, so it has been widely valued by developed countries in the world. For example, Japan, the United States and France have produced and sold such products in large quantities. Its users are also some well-known large companies, such as Bayet (Bayer), Henkel (Henkel), Shell (Shell), Agr.Eva (Aegfor) and other large companies have begun to use water-soluble film to package their products.
In China, the water-soluble film market is emerging. As far as the domestic market is concerned, according to relevant statistics, the current annual demand for packaging film accounts for 20% of plastic products, about 309,000 tons, even if it occupies 5% of the market, the annual demand The volume also reached 15,000 tons. Its main applications are as follows:
Used for packaging products used in water, such as pesticides, fertilizers, pigments, dyes, detergents, water treatment agents, mineral additives, detergents, concrete additives, chemical reagents for photography and chemical reagents for gardening care, etc.; water transfer printing, used Trademark and pattern transfer on the special-shaped surface of ceramics and electrical appliances; high-temperature water-soluble film (insoluble below 40°C), can be used for clothing and textile packaging, food preservation film, etc., especially for export packaging; used for seed bags, agricultural seedlings , Embroidery, etc.
In addition, the main raw material of water-soluble film is polyvinyl alcohol. China is a major producer of raw materials. This is extremely beneficial to the market development of the application prospects of water-soluble packaging films. With the development and progress of society, people are paying more and more attention to keeping us The environment that depends on for survival, especially China is about to integrate with developed countries in the world, and the requirements for packaging environmental protection are increasing. Therefore, the application prospect of water-soluble film in China must be very broad.
As a new type of green packaging material, the research and application of water-soluble packaging film in China has just begun, and it has only 15 years of development history abroad. Therefore, there are many topics to be researched and developed, specifically as follows:
1. Research on quality control methods of water-soluble film production
Due to the unique production process of water-soluble film, various defects such as bubbles, uneven thickness, thick edges, "fish eyes", pinholes, wrinkles, etc. will occur during the production. The causes are very complex and these defects are directly caused. Affect the application of water-soluble membrane, therefore, it is necessary to conduct in-depth research.
2. Research on the influence of each component on the water-soluble packaging film and the mechanism of action. The various physical and chemical properties of the water-soluble film are the result of the comprehensive action of its components. In-depth study explores the impact of each component on the water-soluble packaging film and The mechanism of action is of great significance for improving the quality of water-soluble membrane production, meeting user requirements and developing new water-soluble membranes.
3. Improvement and improvement of water-soluble membrane productivity
At present, the production speed of water-soluble membrane production equipment that has been developed is 4 to 5 meters per minute, and that of similar foreign equipment is about 7 meters per minute. Compared with the production of non-water-soluble membrane equipment by traditional methods, the productivity is obviously very low. This is the cost of water-soluble membranes. An important reason for high. How to improve the productivity of water-soluble membranes will be an important research topic in the future.
4. The development of new water-soluble membranes and the development of new areas of water-soluble membrane applications Although water-soluble membranes have been widely used, with the development of production and social progress, human needs continue to grow, and the application of water-soluble membranes in many new areas needs to be explored. Various new water-soluble membranes need to be developed. For example, the power industry uses heat-resistant (300°C) water-soluble films for welding accessories to replace water-soluble paper, and the washing industry develops water-soluble films with washing functions to be used as film soaps.