Introduction of Anti-rust three-dimensional bag products

Biodegradable plastic bags are plastic products that can be gradually decomposed into harmless substances (water, carbon dioxide, organic matter, etc.) through specific environmental conditions (such as microbial action, light or water dissolution):

1. Core materials and characteristics of biodegradable plastics

The main raw material of biodegradable plastics
Natural polymer materials: starch (corn, potato, etc.), cellulose (wood, cotton), chitin (shrimp and crab shell extract), modified to have thermoplasticity and degradability.
Synthetic biodegradable materials:
Polylactic acid (PLA): made from corn starch, with high transparency but poor heat resistance (≤ 60℃), it is often blended with PBAT to improve toughness.
PBAT/PBS: petroleum-or bio-based synthesis, flexible and often used in composite materials.
Polyhydroxy fatty acid ester (PHA): directly synthesized by microorganisms, degradable in seawater and soil, and high cost.
Optimization of properties of biodegradable plastics
By blending PLA and PBAT (usually in a ratio of 7:3), the tensile strength is increased by 40%, taking into account hardness and flexibility.
Starch-based materials need to be added with plasticizers to enhance stability and avoid the formation of microplastics.

Degradation mechanism and environmental requirements of biodegradable plastics

Principle of biodegradation of plastics

Microorganisms secrete esterase and other "molecular scissors" to cut the molecular chain of PLA/PBAT, and gradually decompose into water, carbon dioxide and inorganic salts.
Necessary conditions: it needs a specific composting environment (high temperature and humidity + rich microorganisms), and the degradation is slow in ordinary natural environment.

Degradation cycle and products of biodegradable plastics