A kind of photodegradable polypropylene material and preparation method thereof

Abstract

The invention relates to the field of polymer materials, and specifically discloses a photodegradable polypropylene material, comprising the following raw materials in parts by weight: 100-120 parts of polypropylene resin, 0.1-1 part of a photodegradation agent, and the photodegradation agent is tungsten Iron acid. Ferric eleostearate contains three conjugated double bonds, and iron ions are used as photosensitizers. Ferric eleostearate can absorb most of the short-wavelength ultraviolet light and has outstanding absorption ability, so that eleostearate can absorb enough energy from light. After obtaining enough energy, ferric eleostate excites iron ions to form an excited state, and the excited state iron ions interact with polypropylene to promote polypropylene to generate a large number of free radicals, and the generated free radicals will promote the degradation rate of polypropylene. The excited state iron ions will return to the normal state of iron ions after promoting the generation of free radicals in polypropylene, and continue to cooperate with eleostearic acid to absorb ultraviolet light, and the cycle is carried out. The photodegradation rate of polypropylene is greatly improved.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a photodegradable polypropylene material and a preparation method thereof. Background technique [0002] Polypropylene is a general-purpose polymer material, and its production and consumption are second only to polyethylene (PE) and polyvinyl chloride (PVC) thermoplastic materials. Polypropylene has the advantages of small specific gravity, good heat resistance, high mechanical properties, good electrical insulation, stable chemical properties, and easy processing into plastic products, synthetic fibers, and synthetic rubber. However, in recent years, with the increasing use of plastics, the environmental pollution caused by plastic waste products has attracted more and more countries and governments. As one of the plastics with very high production output, how to properly handle polypropylene plastic products has become an important topic. Among them, designing a reasonable p...

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Problems solved by technology

[0004] CN110527191A discloses an inorganic degradable plastic masterbatch material and its preparation method. The components of the inorganic degradable plastic masterbatch material are as follows: 56-72% by mass calcium carbonate mineral powder; 3-10% by mass polyethylene; 18-30% by mass % by mass polypropylene; 2-5% by mass of glass fiber; and 3-5% by mass of additives, but the material has a long degradation cycle; it contains non-degradable components such as glass fiber, which is not conducive to market promotion

[0005] CN111218123A discloses a degradable plastic film additive and its preparation method, comprising the following steps: stirring 3-8 parts of silicone oil, 20-30 parts of fumed silica and 5-12 parts of chrysotile at 65-85 ° C for two Hours, then add 50-75 parts of modified peanut shells, 10-35 parts of modified starch, 15-35 parts of active light calcium carbonate and 15-35 parts of random polypropylene for high-speed stirring and dispersion, but the preparation process of this scheme is complicated. There are many pretreatment steps, and the application is difficult; at the same time, asbestos is a non-degradable harmful substance, which is easy to cause harm to the environment

[0006] CN1332196 discloses a degradable material for disposable medical devices, the main components of which are polypropylene, a photoinitiator and a photosensitizer, wherein the photoinitiator is ferric citrate and pentanedione iron, and the photosensitizer is hexachloride Acetone and acetophenone, this solution can realize non-toxic and non-polluting production and use process, but the cost of reagents is relatively high and the production is relatively complicated

[0007] In the existing technical solutions, in the preparation of photodegradable polypropylene materials, there are generally problems such as low degradation efficiency, high cost, or difficult preparation. How to choose an easy-to-obtain, easy-to-produce, environmentally friendly, non-toxic and non-toxic polypropylene material Photodegradable additives with significant degradation effects are an urgent problem to be solved

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