Degraded raw materials
Degradable materials can be generally divided into four categories: photodegradable plastics, biodegradable plastics, photo-biodegradable plastics, and water-degradable plastics.
1. A degradable material is a material that degrades both thermodynamically and kinetically over a period of time. The research on degradable plastics began in the 1970s. In the past three decades, degradable plastics have received special attention due to market demand, and have also been questioned due to issues such as cost and practicability. It can be said that degradable plastics have gone through The journey is tortuous and long.
2. Biodegradable plastics refer to a class of plastics that are degraded by the action of microorganisms such as bacteria, molds and algae that exist in nature. Different from the fully biodegradable plastic bag material PLA, PBAT is a material with good toughness, high elongation but low strength. The Tg of PBAT is -30 °C, the crystallization temperature is 110 °C, the melting temperature is 130 °C, and the decomposition temperature is 375 °C. The aliphatic soft segment of PBAT has good degradation performance and can be decomposed into CO2 and H2O by microorganisms in the soil, and the hard segment has excellent physical properties, heat resistance and impact resistance.
3. The main application fields of degradable plastics are agricultural mulch film, various plastic packaging bags, garbage bags, etc. EEA resins are produced by free radical polymerization in specially adapted high pressure polyethylene reactors. As the content of ethyl acrylate (EA) increases, the copolymer becomes tougher, softer and more elastic. The polarity of the high ethyl acrylate content resin increases the ability of the surface to absorb ink and has adhesive properties.
4. Different scholars have different views on degradation. There is a view that degradants must be decomposed into carbon dioxide and water in order to be called degradation. Therefore, whether it is recyclable, reusable or degradable, it is a relatively environmentally friendly performance, but it must be judged which is more superior based on specific conditions such as market conditions, transportation routes, and management measures.
Degradable materials include: lactic acid, ethylene, starch plastics, photodegradable plastics, PLA and PBAT, etc.
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