来源网址：http://www.rsoau.com 2019-02-15 15:07:06
Entering the new century, more and more serious power and environmental problems make people realize the seriousness of environmental protection, especially the huge amount of packaging information, and major international cities are plagued by white waste.
Therefore, the development of packaging materials for degradable plastics is more important. Many countries in the world have done a lot of work in this field and achieved gratifying results. There are many ways to realize biodegradable data, such as processing with natural ingredients, participating in starch and other substances in resins to make the data differentiated by bacteria, and developing hydrolyzable polymers.
Composition of biodegradable polymer plastics is actually chemical composition of biodegradable plastics, which mainly includes aliphatic polyesters (PCL), polyamides, polysaccharide copolymers, polylactic acid and so on. Many biodegradable polymer materials have been developed, including polylactic acid (PLA), polyvinyl alcohol (PVA), polycaprolactone (PCL) and other polymers. PLA is polymerized from lactic acid monomers, and lactic acid is produced from starch by special bacteria. PLA is expensive and is mainly used in medicine.
Aliphatic polyesters (such as polycaprolactone PCL) have good biodegradability, excellent compatibility with other widely used plastic resins, but poor heat resistance and physical strength.
Aromatic polyesters, such as ethylene terephthalate, have high melting point, high mechanical strength, but poor degradation. Copolymers can be formed by mixing anhydrous zinc carbonate in nitrogen flow. These copolymers prepared by transesterification between polymer chains have excellent biodegradability, heat resistance and mechanical strength.
Polylactide is a kind of biodegradable plastic which can be used as packaging material in recent years. It has broad application prospects. The material of polylactide is lactic acid. The molecule of lactic acid has both hydroxyl and carboxyl functional groups. It has high reactivity. Under appropriate conditions, polylactic acid is simply dehydrated and condensed to form polylactic acid. The composition of poly (lactide) includes direct polycondensation and ring opening polymerization of lactide.
Whether it is composed of polylactide or fermented glucose, maltose, cereal juice or potato starch, it can be used to prepare biodegradable materials. The compost polylactide is degraded in about a month and can be absorbed by microorganisms in seawater.
The above information is our degradable particle sorting release hope to help you with our website is: http://www.rsoau.com!