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[Chemical Knowledge]：Production and manufacturing methods and processes of degradable materials

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The manufacturing method
of degradable materials in the field of chemical production raw materials
1. Introduction

With the increasingly serious environmental problems, degradable materials have become an important research direction in the field of chemical production raw materials. These materials can decompose naturally after use and have less impact on the environment. This article will detail the manufacturing methods of several degradable materials.

2. types of degradable materials and manufacturing methods

1. polylactic acid (PLA)

Polylactic acid is a bio-based biodegradable materials, mainly by corn, sugar cane and other renewable resources extracted by the polymerization of lactic acid. Its manufacturing process mainly includes lactic acid purification, polymerization, granulation and other steps.

(1) lactic acid purification: corn, sugar cane and other raw materials through fermentation or chemical synthesis to obtain lactic acid.

(2) Polymerization: Lactic acid monomers are linked into polylactic acid by a polymerization reaction.

(3) Granulation: The polylactic acid is cut into particles to facilitate subsequent processing.

2. Polyhydroxyalkanoates (PHA)

Polyhydroxyalkanoates are aliphatic copolyesters of different structures synthesized by microorganisms through fermentation of various carbon sources. Its manufacturing process mainly includes microbial culture, fermentation, extraction, purification and other steps.

(1) microbial culture: select the appropriate microbial strains for culture.

(2) Fermentation: PHA is synthesized by microbial fermentation using a carbon source such as glucose as a substrate.

(3) Extraction: PHA is extracted from the fermentation broth by centrifugation, filtration, etc.

(4) Purification: PHA was further purified to improve its purity.

3. Poly-ε-Caprolactone (PCL)

Poly-ε-caprolactone is an aliphatic polyester that can be obtained by ring-opening polymerization of ε-caprolactone. The manufacturing process mainly includes catalyst preparation, ring-opening polymerization, post-treatment and other steps.

(1) Catalyst Preparation: Select a suitable catalyst, such as a tin catalyst.

(2) Ring-opening polymerization: Under the action of a catalyst, ε-caprolactone ring-opening polymerization generates PCL.

(3) Post-treatment: The catalyst is removed by heat treatment and other methods to obtain pure PCL.

3. the application field of degradable materials

of degradable materials in the field of chemical production raw materials have a wide range of applications, mainly including the following aspects:

1. packaging materials: degradable materials can be used to make food packaging, plastic bags, etc., can be naturally decomposed after use, little pollution to the environment.
2. Agricultural film: Degradable materials can also be used to make agricultural films, which can be naturally degraded after use to avoid soil pollution.
3. 3D printing materials: Degradable materials can be used as 3D printing materials for making products of various complex shapes.

4. conclusion

degradable materials have broad application prospects in the field of chemical production raw materials, and its manufacturing methods mainly include polylactic acid, polyhydroxyalkanoates and poly-ε-caprolactone. The use of these materials can reduce the impact on the environment and improve the utilization of resources. In the future, with the continuous progress of technology, degradable materials will be applied in more fields.

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