(B) Development of New High-Efficiency Light and Oxygen Degradation Agents
Photodegradable plastics developed in China are mainly additive types. Following the research and development of transition metal complex-degrading plastic photosensitizers and composite photosensitizers, the Institute of Environmental Materials of Fujian Normal University has conducted in-depth research on the degradation technology of plastic products after light-induced protection from light and continued oxidation. We have developed photodegradable polyethylene masterbatches of carboxylic acid hydrazine or carboxylic acid symbiotic rare earth complexes, which greatly increase the degradation of PE degradation plastics. The series of compound photosensitizers has been put into industrial production and has been successfully applied in garbage bags, shopping bags, plastic films and tableware. In addition, the Institute also developed a carboxylic acid symbiotic rare-earth polyvinyl chloride photosensitizer, which can guide the photodegradation of PVC, and has the effect of continuing the oxidative degradation of light and induced cross-linking effect of PVC in light irradiation, and has been mass produced. Has been applied in the degradation of PVC heat shrinkable film and environmentally friendly casual shoes.
It has been a research hotspot in China in recent years to improve the thermal oxidative degradation of disposable plastic waste. There are many units for the study of hot oxidants, which are currently mass-produced and have been successfully applied to garbage bags, packaging bags, cling films, shrink films, landfill cover films, and plastic films. For example, a degradable plastic packaging film with 0.1% LTHO controllable degradation additive was added. According to relevant authorities, the elongation before breakage was 452%. After 120 hours of xenon lamp irradiation, the sample powdering could not be detected.
(III) Greater progress has been made in the production technology of starch-based biodegradable plastic master batches (special-purpose materials). Starch-based biodegradable plastic masterbatches are the key research and development categories in China. The modification technologies of starch mainly include surface treatment technologies and compatible technologies. Joining technology and so on. Both have made great progress. The former two have entered industrial-scale production.
Starch surface treatment technology is represented by Tianjin Danhai Company. Its technical features: liquid vacuum dehydration, water content can be reduced to 0.5%; micronized, starch particle size of 8m or less; modified hydroxyl modified, modified starch (SMA) in the masterbatch can be added up to 80%, in Membrane products can be as high as 51%, injection products up to 60 ~ 70%, the masterbatch by the Chinese Taiwan Provincial Science Foundation Biotechnology Development Center according to ISO14855/CNS14432 (45 days) detection, biodegradation rate calculated by the amount of carbon dioxide emissions It reached 52.96% (73.32% of the control group). The company has already built 30kt of production capacity of biodegradable plastic masterbatch and products, making it the largest degradable plastics production base in China and Asia. The project has been identified by the State Planning Commission as a demonstration project of national technology industrialization. Its products have won the International Quality Gold Medal at the Fourth International Quality Conference held in Geneva this year. Products have been exported to Japan, Australia, Bangladesh and Taiwan and other countries. And area.
Starch-compatible technology is represented by Nanjing Sushi Co., Ltd. Its technical features: The use of compatibilizer modification technology is mainly completed in the twin-screw extruder, the process is relatively simple, the starch is uniformly dispersed in PE and PP, and the compatibility is good. The product appears as a special material with good processing performance; the content of biodegradable components in the film product can be as high as 60%, and the starch content can reach 45%, which is detected by the Taiwan Biotechnology Development Center based on ISO14855/CNS14432 (96 days). The biodegradation rate was 54.88% (100.81% for the control group cellulose). The company currently has an annual production capacity of 10 kt and the products are mainly exported.
Starch grafting technology has many research units, all of which are in the small-scale stage. Among them, the chemical grafting technology of Zhejiang University has made good progress. The film product with 50% starch content has good quality and appearance, and the price is moderate. Biodegradability is being tested and currently plans to expand trial production.
Starch ultra-micronization is currently one of the key technologies for increasing the starch content, ensuring the strength and appearance of products, and reducing costs. Recently, this issue has made great progress. It mainly uses the ultra-micronized starch equipment developed by the German technical cooperation, and supports the self-developed starch cross-linking modification technology. Its characteristics are as follows: the particle size of starch can be refined to 6 μm (2000 mesh), and the particle size distribution is narrow; The moisture content of up to 5% is also easy to film; starch oiliness increases, further improve the compatibility with the plastic; refined starch storage for several months there is no reunion phenomenon, good dispersion.
(IV) Fully biodegradable plastics enter pilot scale
In recent years, China has invested a large amount of human and material resources in the research and development of biodegradable plastics, including natural polymers, microbial fermentation and synthetic polymers, and chemical synthetic polymers. Some of these have entered the pilot phase. See Table 2 for details.
Photodegradable plastics developed in China are mainly additive types. Following the research and development of transition metal complex-degrading plastic photosensitizers and composite photosensitizers, the Institute of Environmental Materials of Fujian Normal University has conducted in-depth research on the degradation technology of plastic products after light-induced protection from light and continued oxidation. We have developed photodegradable polyethylene masterbatches of carboxylic acid hydrazine or carboxylic acid symbiotic rare earth complexes, which greatly increase the degradation of PE degradation plastics. The series of compound photosensitizers has been put into industrial production and has been successfully applied in garbage bags, shopping bags, plastic films and tableware. In addition, the Institute also developed a carboxylic acid symbiotic rare-earth polyvinyl chloride photosensitizer, which can guide the photodegradation of PVC, and has the effect of continuing the oxidative degradation of light and induced cross-linking effect of PVC in light irradiation, and has been mass produced. Has been applied in the degradation of PVC heat shrinkable film and environmentally friendly casual shoes.
It has been a research hotspot in China in recent years to improve the thermal oxidative degradation of disposable plastic waste. There are many units for the study of hot oxidants, which are currently mass-produced and have been successfully applied to garbage bags, packaging bags, cling films, shrink films, landfill cover films, and plastic films. For example, a degradable plastic packaging film with 0.1% LTHO controllable degradation additive was added. According to relevant authorities, the elongation before breakage was 452%. After 120 hours of xenon lamp irradiation, the sample powdering could not be detected.
(III) Greater progress has been made in the production technology of starch-based biodegradable plastic master batches (special-purpose materials). Starch-based biodegradable plastic masterbatches are the key research and development categories in China. The modification technologies of starch mainly include surface treatment technologies and compatible technologies. Joining technology and so on. Both have made great progress. The former two have entered industrial-scale production.
Starch surface treatment technology is represented by Tianjin Danhai Company. Its technical features: liquid vacuum dehydration, water content can be reduced to 0.5%; micronized, starch particle size of 8m or less; modified hydroxyl modified, modified starch (SMA) in the masterbatch can be added up to 80%, in Membrane products can be as high as 51%, injection products up to 60 ~ 70%, the masterbatch by the Chinese Taiwan Provincial Science Foundation Biotechnology Development Center according to ISO14855/CNS14432 (45 days) detection, biodegradation rate calculated by the amount of carbon dioxide emissions It reached 52.96% (73.32% of the control group). The company has already built 30kt of production capacity of biodegradable plastic masterbatch and products, making it the largest degradable plastics production base in China and Asia. The project has been identified by the State Planning Commission as a demonstration project of national technology industrialization. Its products have won the International Quality Gold Medal at the Fourth International Quality Conference held in Geneva this year. Products have been exported to Japan, Australia, Bangladesh and Taiwan and other countries. And area.
Starch-compatible technology is represented by Nanjing Sushi Co., Ltd. Its technical features: The use of compatibilizer modification technology is mainly completed in the twin-screw extruder, the process is relatively simple, the starch is uniformly dispersed in PE and PP, and the compatibility is good. The product appears as a special material with good processing performance; the content of biodegradable components in the film product can be as high as 60%, and the starch content can reach 45%, which is detected by the Taiwan Biotechnology Development Center based on ISO14855/CNS14432 (96 days). The biodegradation rate was 54.88% (100.81% for the control group cellulose). The company currently has an annual production capacity of 10 kt and the products are mainly exported.
Starch grafting technology has many research units, all of which are in the small-scale stage. Among them, the chemical grafting technology of Zhejiang University has made good progress. The film product with 50% starch content has good quality and appearance, and the price is moderate. Biodegradability is being tested and currently plans to expand trial production.
Starch ultra-micronization is currently one of the key technologies for increasing the starch content, ensuring the strength and appearance of products, and reducing costs. Recently, this issue has made great progress. It mainly uses the ultra-micronized starch equipment developed by the German technical cooperation, and supports the self-developed starch cross-linking modification technology. Its characteristics are as follows: the particle size of starch can be refined to 6 μm (2000 mesh), and the particle size distribution is narrow; The moisture content of up to 5% is also easy to film; starch oiliness increases, further improve the compatibility with the plastic; refined starch storage for several months there is no reunion phenomenon, good dispersion.
(IV) Fully biodegradable plastics enter pilot scale
In recent years, China has invested a large amount of human and material resources in the research and development of biodegradable plastics, including natural polymers, microbial fermentation and synthetic polymers, and chemical synthetic polymers. Some of these have entered the pilot phase. See Table 2 for details.
Switchgear, Xgn75-12 (Z) Indoor Gas Insulation Metal-Enclosed Switchgear (XGN75-12(Z)), China Switchgear
Sunway Hanguang Electric Manufacturing Limited , http://www.sunway-interrupter.com