What raw material produces the plastic to the human body not to harm, to the environment does not have the pollution?
Polylactic acid (PLA) and poly lactide, by microbial fermentation of lactic acid monomer chemical synthesis. After the use of automatic degradation, will not pollute the environment. Poly lactic acid can be processed into fibers and films have excellent mechanical properties, its strengthroughly with nylon fiber and polyester fiber. Polylactic acid in vivo can be hydrolyzed into lactic acid and acetic acid, and the metabolic enzymes of CO2 and H2O, so it can be used as medical materials. In Japan, the United States has been using polylactic acid plastic processing suture, artificial bone and artificial skin. Polylactic acid was also used in the production of packaging containers, agricultural film and fiberwith sportswear and bedding.
Starch plastics containing starch in more than 90%, add other components also can be completely degraded, there are Japan Sumitomo Business Corporation, American Wamer-Lamber company, Italy Ferrizz company claims of success starchier in 90% to 100% of full starch plastics, in (January ~ 1) completely biodegradable without leaving any trace, no pollution, can be used in the manufacture of various containers, bottles, films and garbage bags etc. all starch plastics production principle is that the starch molecular allostent anddisorderly change formed with thermoplastic starch resin, also known as the thermoplastic starch plastics. The molding process can be used in traditional plastic processing equipment. With starch as the potential advantages of development of bio degradable plastics raw materials: starch has biodegradability completely in various environments; plastic in the degradation of starch molecules or after ashing, the formation of two oxygen Carbon gas, without soil or air poison; take appropriate technology to make starch thermoplastic after mechanical properties can reach for manufacturing plastic material; starch is a renewable resource, inexhaustible, pioneering starch utilization is conducive to rural economic development. That is, starch plastics production in China of vast the majority of starch filled plastics, is added in a certain proportion of polymer materials in non biodegradable starch, resulting in the collapse of material physical property through biodegradation of starch, prompted a large number of end groups that exposed to oxidative degradation, but the rest of the "collapse" after the PE, PVC and so on are not always possible degradation the residue in soil, of course, days and months multiplying will cause pollution, so the foreign ownership for such products will be eliminated.
For example, light degradable plastics manufacturing methods can be divided into light degradable plastics synthetic degradable plastics and adding degradable plastics. A, ethylene copolymer / carbon monoxide (E/CO) photodegradation to ketone backbone fracture characteristics of.E/CO light degradation speed and degree and the amount of the chain, the higher the content, the degradation rate of the soon, the greater. The United States of Texas, scientists have to E/CO for outdoor exposure experiments in sunny June, the fastest E/CO only a few days can be degraded. B, ethylene / vinyl ketone copolymer (Ecolyte) keto Ecolyte molecules on the side chain can be decomposed to.Ecolyte light the degradation performance is better than E/CO in the role of natural light, but the cost is higher. This kind of polymer drawback is once see the light starts to degrade, almost no induction period, need adding antioxidants to regulate the induction period Purpose. (2) add type light degradable plastics additive light degradable plastics with a small amount of photosensitizer in the polymer, at low concentration is the degradation of photocatalytic oxidation by solar irradiation (Zi Waiguang) and react to the polyolefin polymer fracture. In PE, PP polymers such as ketones, amines and adding photosensitizer can good photodegradability. Add light degradable plastics with low cost, simple production process, do mulching better. But the degradation characteristics of the exposure surface degradation more thoroughly, some less degradation buried in the soil. The degradation of this kind of photodegradable plastics can be controlled in the induction period of two months or more. But the degradation time control is poor.
