Fully-biodegradable plastic and preparation method thereof

Abstract

The invention discloses a fully-biodegradable plastic and a preparation method thereof and relates to the technical field of plastic preparation. The fully-biodegradable plastic is prepared from, by weight, 40-60 parts of polycaprolactone, 10-20 parts of straw fiber, 10-20 parts of bran, 5-15 parts of chitosan, 4-10 parts of biuret modified epoxide resin, 2-8 parts of methylene diphenyl diisocyanate, 1-7 parts of acetyl tributyl citrate, 0.1-0.5 part of 2,2-bis(4-hydroxyl phenyl) propane, 1-8 parts of polypropylene grafted maleic anhydride, 1-5 parts of silane coupling agent, 1-5 parts of stearic acid, 1-5 parts of carrageenan and 1-7 parts of glycerin. The preparation method comprises the steps of bran pretreatment, straw fiber modification, mixture, extrusion, blow molding and the like.The plastic can be fully biodegradable, can be completely biodegraded outdoors in 3-9 months and does not pollute the environment. In addition, the structural strength and the mechanical strength of the fully-biodegradable plastic are improved, the tensile strength of the plastic is 9-18 N / mm<2>, the breaking strength is 10-28 N / mm<2>, and the elongation at break is 100-240%.

Description

technical field [0001] The invention relates to the technical field of plastic preparation, in particular to a fully biodegradable plastic and a preparation method thereof. Background technique [0002] With the increasingly serious problems of environmental pollution and energy shortage, the development and application of environmentally friendly materials have become the focus of research. Environmentally friendly materials use renewable resources as raw materials, the products are biodegradable, the sources of raw materials are abundant, and the advantages of product degradation and pollution-free promote their vigorous development and application. In the process of product development, degradable polymers have received extensive attention due to the use of non-petroleum raw materials. [0003] Natural fibers are often used as reinforcements and fillers instead of some synthetic fibers due to their cheap availability, renewable and good biocompatibility. In recent years...

AI Technical Summary

Problems solved by technology

As the basic agricultural products, rice and wheat have a large annual output. Except for a small amount of rice and wheat by-product straw, which is used for gaskets, feeding livestock, and partly used for composting, most of them are abandoned or burned as fuel; wheat The by-product bran of wheat bran is mainly used as feed or discarded, resulting in a great waste of resources; current research mainly focuses on the functional research of some components or components of wheat bran, and less research on other aspects; therefore rice straw and wheat bran are not properly utilized

[0004] 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 dispersion, so it is difficult to simply mix the two to meet the required requirements, so improving its interfacial compatibility becomes the key to research and prepare natural plant fiber composites