SB B degradable film

Plastic products have been widely used in industry, agriculture, and daily life for many years. They have played a tremendous role in promoting the production and development of industry and agriculture. They have brought convenience to people's lives and have become almost indispensable necessities in various fields. However, due to the fact that plastics cannot be degraded in the natural environment for a hundred years, over time, it has become a serious threat to the human living environment. Plastics demand and production have maintained a steady growth trend. In 2000, the world's plastics production was 163,000 kt. The average annual growth rate from 1986 to 2000 was 6.3%. It is estimated that in 2007 the worldwide demand for plastics will reach 21,000 kt to reach 28,000 kt by 2026, of which universal plastics will reach 195,000 kt respectively (accounting for 92.9% of total plastic demand and 350000 kt (92.1%). According to reports, plastic waste has accounted for 30% of urban waste (volumes far exceed 30%), and global plastic waste has reached 220 million tons five years ago. In rural areas, waste plastics (plastic films) are constantly causing serious damage to the soil structure of cultivated land.... The environmental pollution caused by plastic waste has become a global environmental problem. Many countries and regions in the world have already banned the use of such non-degradable plastics and actively promote the development and production of degradable plastics.

According to different degradation mechanisms, degradable plastics can be divided into three categories: 1 photodegradable plastics; 2 biodegradable plastics; 3 light-biodegradable plastics. Photodegradable plastics absorb ultraviolet light of a certain intensity and decompose into low-molecular compounds. However, waste plastics are generally found in garbage dumps or soils, and it is difficult to absorb ultraviolet rays of a certain intensity. However, in use and transportation, it is exposed to strong ultraviolet rays (degradation) and affects its use. Biodegradable plastics: Biodegradable plastics after use are discarded in waste or soil and can be eroded and devoured by microorganisms and enzymes, naturally transforming them from high-molecular substances to low-molecular compounds. Photo-biodegradable plastics act together with light and micro-organisms, but the role of micro-organisms is often in dark, moist conditions. Plastics in the trash or soil should be said to be primarily biodegradable.

Starch-based biodegradable plastics have attracted a great deal of attention at home and abroad for many years due to their abundant raw materials, renewable, natural degradation, and low cost. Japan established the Biodegradable Plastics Research Association as early as 1989, and considered the degradable plastic as the fourth new material after the metal, inorganic and polymer materials. Mater-Bi of Novamont, Italy, is a plastic prepared with modified starch as the main component and added with a small amount of modified PVAC blend glue. It has good fluidity and ductility, and can be injected, extruded and thermoformed. Mainly used for health care and toys. However, it is hydrophilic and cannot be in contact with water, and it is not suitable for use under environmental conditions of 50°C or higher and humidity of 30-80%. However, Mater-Bi is still considered as a degradable plastic with good overall processability, mechanical properties and good biodegradability.

Wamar, United States

Lambert's multi-year research into the biodegradable plastics with higher starch content—Novon basically replaces the related plastic products currently used in agriculture and medicine. Novon's glue contains 70% amylopectin and 30% amylose. That is, potatoes and various cereal starches are modified but retain a certain amount of moisture. This glue can be granulated. It can be processed by injection, extrusion and other methods to form drug micelles, flower pots, etc., and its products can be biodegraded under both aerobic and anaerobic conditions.

Another example is Australia's thermoplastic starch plastic, it has good fluidity, ductility, product is soft, high transparency, easy mold release, degradation can be controlled, has developed agro-film, food packaging film and other products.

The research and production of degradable plastics in China are developing rapidly. According to relevant data, there are more than 60 companies engaged in research production in China. There are dozens of production lines, but most of the production is filled with starch plastics, and the content of starch is generally less than 30%, and most of the degradable plastic products introduced to the market are actually PE, PP, PVC, PVAL. A small part of the production is photodegradable plastic, so it is far from satisfying the demand from the point of view of the characteristics and quantity of degradable plastics. Of course, some research units have already achieved 60% starch content in PE starch-filled plastic films. There are also units that have made gratifying achievements in the study of starch thermoplastics.

SBB degradable film properties:

SBB degradable film is a kind of plastic body made of starch, cellulose, polysaccharide as the matrix through modification, cross-linking, graft copolymerization and other technologies, and then made into a film through a specific process. Starch, cellulose and polysaccharides account for 85% of the solid content (A-type membrane) and 100% (B-type, C-type membrane). The film is transparent, clear and bright (except A2 matt film), has a certain moisture resistance and water resistance, can be printed and dyed, can be heat sealed, the film is soft, resistant to folding, and has a certain strength. The film can be made into a variety of red, yellow, blue color packaging machine 'target = _blank> transparent film, film thickness 30-100μm can be produced on demand. The film can be biodegraded in a dark, moist soil or waste, and the degradation time is related to the thickness of the membrane, and is generally rotted and degraded in 8-14 months. Therefore, the film must be stored in a clean bag or box for a long time.

SBB degradable film contains three types: A type, B type, and C type:

A-type film: This film is a daily-use packaging film and bag film, the film can be heat-sealed, printing and dyeing, moisture and water resistance. A type membrane is divided into two types:

A1 - transparent, clear and bright.

A2 - matt, opaque.

B-type film: This film is a one-time edible packaging film, 100% starch fiber polysaccharide film, transparent film, clear and bright, soft and resistant to folding, with good strength and moisture resistance, this film can be with food Intimate contact, food with food when needed. This film can be packaged bread, biscuits, cakes and other foods.

C-type membrane: This membrane is composed of 100% starch, polysaccharides, and fibers. C-type membrane soluble edible packaging film and white edible decorative film:

C1 soluble edible packaging film: This film can be used as a packaging bag for solid beverages, proprietary Chinese medicines (coffee, fruit crystal powder, sesame aleurone powder, proprietary Chinese medicines such as Sanjiu Weitai, cold granules, etc.). After hot water is washed, it dissolves quickly in the stirring and can be flushed with the packaged product. The water temperature can be above 70°C. The ingredient bag as instant noodles is more convenient and environmentally friendly.

C2 White Edible Film: This film can be used for special foods and foods. It can be used for intimate contact with food and can be eaten.