Controllably degraded biological full-degradable plastic and preparation method thereof

Abstract

The invention discloses a controllably degraded biological full-degradable plastic, and relates to the technical field of plastic preparation. The controllably degraded biological full-degradable plastic is prepared from the following raw materials in parts by weight: 15 to 25 parts of straw fiber, 10 to 20 parts of bran, 5 to 15 parts of cyclodextrin, 4 to 12 parts of maltodextrin, 15 to 25 partsof polylactic acid, 15 to 25 parts of poly(butylene succinate), 6 to 16 parts of calcium carbonate, 4 to 10 parts of Pulullan, 3 to 7 parts of chitosan, 1 to 7 parts of benzoic acid, 1 to 5 parts ofacetic acid, 2 to 8 parts of sodium stearate, 1 to 7 parts of ethylene acrylic acid co polymer, 4 to 12 parts of linolenate, 5 to 15 parts of Arabic gum, 2 to 8 parts of mannitol, 2 to 8 parts of oxidized polyethlene wax and 4 to 10 parts of sodium carboxymethyl starch. The preparation method comprises the following steps: pretreatment of bran, modification of straw fiber, mixing, extrusion blow molding and the like. According to the plastic disclosed by the invention, biological full-degradation can be carried out, and the degradation time is controlled by adjusting the proportion of degradable substances, and degradation can be completed fundamentally outdoors for 3 to 9 months, so that the environment cannot be polluted, and the plastic is high in structural strength and mechanical strength at the same time.

Description

technical field [0001] The invention relates to the technical field of plastic preparation, in particular to a biodegradable plastic with controllable degradation and a preparation method thereof. Background technique [0002] Plastic garbage bags are almost indispensable in people's daily life. In life, shopping in supermarkets, vegetable markets or other forms of shopping often use plastic bags to store items. A large number of shopping plastic bags become domestic waste and are discarded after they are used up. The main component of existing plastic garbage bags is polyethylene, which is difficult to degrade in the natural environment, causing serious "white pollution"; at the same time, the existing plastic garbage bags are expensive due to the high content of polyethylene. . [0003] Since the advent of biodegradable plastics in the 1980s, it has always been a hot spot in the research of new materials. Biodegradable plastics originally filled with starch in general-p...

AI Technical Summary

Problems solved by technology

However, plant fibers contain a large number of hydroxyl groups and phenolic hydroxyl groups, which have strong hydrophilicity. At the same time, the thermoplastic resin has strong hydrophobicity, which makes the interface compatibility between the two poor. At the same time, due to the existence of hydroxyl groups and phenolic It is easy to agglomerate and has poor dispersibility, so it is difficult to meet the required requirements by simply mixing the two