Since the white pollution caused by the conventional plastic bag is getting more serious, as people's environmental awareness is continuously improved, the plastic bag, PLA full biodegradation plastic bag, all kinds of new degradation materials in all-descending plastic bags, the plastic bags, Today, what are the materials of a biodegradable plastic bag.
First, what is a biological degradation plastic bag?
The biodegradable plastic bag refers to the microorganisms such as bacteria such as bacteria, molds such as bacteria, molds such as bacteria, molds such as bacteria, molds such as bacteria, molds such as bacteria, molds such as nature, under conditions such as soil and / or sand soil, and / or specific conditions such as composting conditions or under anaerobic digestion conditions or in an aqueous culture solution. And algae or the like cause degradation, and finally degraded into a mineralized inorganic salt of carbon dioxide (CO2) or / and methane (CH4), water (H2O) and its elements, and a new biomass plastic bag.
Second, the most popular biodegradable plastic bag material: PLA
Polylactic acid (PLA) is a new type of biodegradable material, which is made of starch raw materials proposed using renewable plant resources (such as corn). It has good biodegradability, which can be fully degraded by microbes in nature after use, and finally produce carbon dioxide and water, not polluting the environment, which is very advantageous for protecting the environment and is recognized by environmentally friendly materials.
Degradation of Polylactic Acid PLA is divided into two phases: 1) First, it is firstly purified water to form an lactic acid monomer; 2) Lactic acid monomer decreases in the action of microorganisms to solve carbon dioxide and water. The food cup made of polylactic acid can be completely degraded for 60 days, truly achieving ecological and economic dual effects.
Third. What are the other plastic bag materials in PLA?
1. Poly 3-hydroxyalkate (PHA)
PHA is an aliphatic copolyester that is synthesized by a microorganism by various carbon source fermentation. Among them, the most common poly 3-hydroxybutyrate (PHB), polyhydroxyvaleate (PHV) and copolymers (PHBV) of PHV.
The main purpose is: disposable tableware, nonwoven fabric, packaging materials, agricultural coating, toys, envelopes, glue, fibers, etc. can be degradable.
2. Poly ε-caprolactone (PCL)
Poly ε-caprolactone (PCL) is a low-melting polymer obtained from ε-caprolactone to which the ring polymer is polymerized, and its melting point is only 62 ° C. The degradability of PCL has begun from 1976, and the PCL can be completely decomposed by microorganisms in an anaerobic and needle environment.
Compared to PLA, PCL has better hydrophobic, but the degree of degradation is slower; while its synthetic process is simple, the cost is low. The PCL has excellent processing performance, and a thin film and other articles can be made from ordinary plastic processing equipment.
3. Polyester - PBS / PBSA
The PBS is mainly produced by aliphatic butyric acid and butanediol, which can both satisfy the demand through petrochemical products, or can also be renewable to renewable crop products in natural boundaries such as starch, cellulose, glucose, and produced through biological fermentation pathways. From nature, return to natural green circulating production. Moreover, the raw materials produced by the biological fermentation process can also reduce the cost of raw material, thereby further reducing the PBS cost.
Compared with similar products, the advantages of polyester biomass plastics:
1) Good heat resistance. This prompss it to achieve promotion in the catering area;
2) The requirements for processing conditions are not high;
3) It is easy to save and hydrolyzes.
Polybut dioxicanol ester (PBS) is extremely wide, can be used in packaging, tableware, cosmetic bottles, medicines, disposable medical supplies, agricultural films, pesticides and chemical sustained release materials, biomedical polymer materials and other fields.
4. Aliphatic aromatic copolyester
The aliphatic aromatic random copolyester manufactured by Germany Basf has a monomer: adipic acid, terephthalic acid, 1,4-butanediol. The current production capacity is 140,000 tons / year. At the same time, it has developed biodegradable plastic products based on polyester and starch.
5. Polyvinyl alcohol (PVA)
Water-soluble PVA films are a new type of plastic product in the international emergency. It utilizes the film formability, water and biological degradation characteristics of PVA, which can be completely degraded into CO2 and H2O, which is the actually green high-tech environmental packaging material.
6. Carbon dioxide copolymer
A novel synthetic material being studied, with carbon dioxide as a monomer feedstock, is activated to a higher degree of reacting, and aliphatic polycarbonate is generated with an epoxide. PPC), after treatment, the carbon dioxide resin material is obtained.