The raw material of polylactic acid is generally a crop such as corn, which is obtained by microbial fermentation to obtain a lactic acid monomer, which is then polymerized to form a biodegradable polymer material. The existing plastics can be replaced by polylactic acid resin. Because of its good performance, it can be widely accepted by the market. It is defined by the industry as the most promising new packaging material in the new century. It has become a competition for governments, scientific research institutions and enterprises. The development of green materials, its application prospects are very attractive.
Among various biodegradable materials, polylactic acid is considered as the most promising variety as a packaging material, and polylactic acid packaging materials have the following advantages:
1. Good biodegradability. Usually under normal temperature, polylactic acid resin can maintain stable performance. Under composting conditions, it can be completely decomposed by microorganisms within 2-3 months, eventually producing water and carbon dioxide without polluting the environment.
2. Biocompatibility and bioabsorbability are very good. Lactic acid, the basic raw material of polylactic acid, is one of the inherent physiological substances of the human body, and the packaging material is non-toxic, non-toxic and non-irritating to the human body.
3. Polylactic acid resin is a kind of thermoplastic resin, which has good mechanical properties and mechanical properties, and is also good in oil resistance and odor barrier. The processed packaging materials have the advantages of anti-penetration, gloss and processability.
4, the raw material of polylactic acid resin is starch, sustainable supply, the price is relatively low, unlike the packaging materials based on petrochemical products, not affected by the international crude oil price, can have a certain degree of relief of energy problems.
5, the raw materials are generally extracted from renewable plant resources, as long as the rich starch in the crop can be converted into polylactic acid, does not consume non-renewable mineral resources, will not lead to an increase in carbon dioxide emissions, in line with the cycle Economic principles have a good effect on the sustainable development of society.
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