Compositions for photodegradable and biodegradable plastic product and use thereof

A multicomponent composition for photodegradable and biodegradable plastic articles, consisting of a biodegradable component, a photodegradable and auto-oxidation catalysis component, non-metallic minerals, carrier and the like, characterized in that said multicomponent composition mainly contains the following components (1), (2) (3) and (4), or components (1), (2) and (4):

• (1) the biodegradable component in an amount of 0.1-10 wt %, which does not contain starch, and characterized in that it comprises one or more substances selecting from the group consisting of chitin, casein, sodium (or zinc, calcium, magnesium, potassium) phosphate and metal:
• salt of hydrogen phosphate or dihydrogen phosphate, amide derivatives of erucamide and oleamide and the like;
• (2) the photodegradable and auto-oxidation catalysis component in an amount of 0.1-8.0 wt %, which comprises one or more substances selecting from the group consisting of ferrocene derivatives, mainly n-octyl ferrocene, n-octanoyl ferrocene, undecylenoyl ferrocene, γ-ferrocenyl butyric acid, γ-ferrocenyl butyl butyrate and the like;
• thioaminocarboxylate, such as iron diethyl dithiocarbamate, iron dibutyl dithiocarbamate and the like;
• cobalt (or manganese, zinc, iron, cerium) aliphatic acid compound, such as cobalt (manganese, zinc, iron, cerium) formate, cobalt (manganese, cerium, iron, zinc) acetate, cobalt (manganese, cerium, iron, zinc) oleate, cobalt (manganese, cerium, iron, zinc) laurate, cobalt (manganese, cerium, iron, zinc) stearate, cobalt (manganese, cerium, iron, zinc) cetylate and the like;
• acyl compound containing the ion of cobalt, manganese, iron and the like, such as cobalt (or manganese, iron) acetylacetonate;
• dibutyltin laurate;
• and benzophenone and derivatives thereof;
• (3) non-metallic minerals in an amount of 10-90 wt %, which comprises the substance selecting from the group consisting of talc, calcium carbonate, kaolin, wollastonite and the like;
• (4) carrier component in an amount of balance, which is the general resin selecting from the group consisting of PE, PP, PS, ABS, EVA, PA, PET, PVC and the like.