Fully biodegradable plastic bag materials refer to a class of plastics that are degraded by the action of microorganisms such as bacteria, molds (fungi) and algae that exist in nature. The ideal fully biodegradable plastic bag is a plastic bag made of a polymer material with excellent performance, which can be completely decomposed by environmental microorganisms after being discarded, and finally inorganicized to become an integral part of the carbon cycle in nature. "Paper" is a typical biodegradable material, while "synthetic plastic" is a typical polymer material. Therefore, a fully biodegradable plastic bag is a plastic bag made of a polymer material with both material properties of "paper" and "synthetic plastic".
Fully biodegradable plastic bag materials, also known as biodegradable plastics, refer to natural materials that exist in nature under conditions such as soil and/or sandy soil, and/or under specific conditions such as composting conditions or anaerobic digestion conditions or aqueous culture solutions. The action of microorganisms causes degradation and ultimately complete degradation of plastics into carbon dioxide (CO2) or/and methane (CH4), water (H2O) and its mineralized inorganic salts of the elements it contains, as well as new biomass.
Plastics are polymer compounds (macromolecules) that are polymerized from monomers as raw materials through polyaddition or polycondensation reactions. They have medium resistance to deformation and are intermediate between fibers and rubber. They are composed of synthetic resins and fillers, plasticizers, stabilizers Agents, lubricants, pigments and other additives.
The main component of plastic is resin. Resin refers to a polymer compound that has not been mixed with various additives. The term resin was originally named for the lipids secreted by animals and plants, such as rosin and shellac. Resin accounts for about 40% to 100% of the total weight of plastics. The basic properties of plastics are mainly determined by the nature of the resin, but additives also play an important role. Some plastics are basically composed of synthetic resins with no or little additives, such as plexiglass, polystyrene, etc.
The difference between fully biodegradable plastic bags and ordinary plastic bags
1. Different materials
Fully biodegradable plastic bags (that is, environmentally friendly plastic bags) are made of PLA, PHAs, PBA, PBS and other polymer materials. The non-degradable traditional ordinary plastic bags are other plastic materials such as PE.
2. Different production standards
Fully biodegradable plastic bags need to meet the national standard GB/T21661-2008, which has reached the environmental protection standard. The traditional non-degradable ordinary plastic bags do not need to comply with this standard.
3. Different decomposition time Fully biodegradable plastic bags can generally be decomposed within one year, while Olympic green plastic bags can even start to decompose 72 days after they are discarded. It takes 200 years for non-degradable ordinary traditional plastic bags to degrade.
Advantages of using fully biodegradable plastic bags
1. Environmental protection: The use of fully biodegradable plastic bags can greatly reduce the problem of white pollution caused by the inability of traditional ordinary plastic bags to decompose.
2. Excellent performance: The fully biodegradable plastic bag uses starch as the main raw material, the degradation ability is better than other materials, the service life is longer than that of the paper bag, and the cost is lower than that of the paper bag.
3. Exquisite and versatile: Fully biodegradable plastic bags and ordinary plastic bags have the same functions except for different components and materials. They can be beautifully printed, moderate in size, and can pack many products.
4. Recycling: The fully biodegradable plastic bag has the characteristics of softness, wear resistance, foldability and good texture, and the recycling period is long.
