Biological basis TPU refers to a class of polymer materials that can be decomposed into small molecular compounds after completing the service life. It refers to a new class of plastic with usable mechanical strength and can decompose under the action of light, oxygen and microorganisms in the natural environment in a relatively short period of time, and will not cause pollution to the environment.
The development and development of bio-based TPU is the result of extensive research to protect the living environment and prevent waste pollution, which is of great significance to the sustainable development of plastic industry in the future.
The definition, degradation mechanism and evaluation method of biobased TPU are still being discussed at home and abroad.There are also arguments in some aspects.Generally, biodegradable materials can be divided into two biological materials and environmental degradation materials, and environmental degradation materials can be divided into photodegradation, biodegradation and chemical degradation.
1, photodegradationsPhotodegradative plastics are those plastics where the polymer chain slowly breaks mainly under light and loses their physical, mechanical properties and use value for a certain period of time.Photodegradation is subpolymerized and additive type.
2. biogroup tpu, refers to the microorganisms present in nature, such as bacteria, mold, and algae, which can be degraded into small molecule compounds.Of course, biodegradation and photodegradation often occur simultaneously and interact, and in practical application, only only a single factor produces a degradation reaction.
3. biogroup TPU should interact with microbes.According to the degree of degradation, it is divided into fully biodegradable plastic and incomplete biodegradable plastic.Fully biodegradable plastic refers to a class of plastic that can be fully decomposed into small molecular compounds and absorbed by the surrounding environment; incomplete biodegradable plastic is a class of plastic that can only be partially decomposed into small molecular compounds, and others can only be broken into small polymer polymers
Post time: Sep-13-2021