Biodegradable straw and preparation method thereof

Abstract

The invention discloses a biodegradable straw and a preparation method thereof, and relates to the field of biodegradable materials. The biodegradable straw is prepared from the following raw materials in parts by mass: 100 parts of aliphatic polyester resin, 0-50 parts of filler, 0.5-5 parts of compatilizer, 0.5-3 parts of chain extender, 0.01-0.5 part of initiator, 0.5-3 parts of grafting monomer, 1-3 parts of lubricant and 0.3-0.6 part of antioxidant, wherein the aliphatic polyester resin is PBS, PBAT, PLA or a mixture of PBS, PBAT and PLA. The preparation method comprises the steps of preparing a required filler and a compatilizer, placing the filler and the compatilizer in a high-speed mixer for mixing, and discharging the mixture; and adding the mixture into a continuous internal mixer for internal mixing, enabling the mixture to fall into a conical double-forced feeding machine to be fed into a double-screw extruder for granulation to obtain required formula granules, extrudingthe required formula granules into a pipe through the extruder, and cutting the pipe to obtain the straw. The straw can be completely biodegraded after being discarded, has the using performance similar to that of a polypropylene straw, and is cold-resistant and heat-resistant. The method is suitable for industrial production and low in cost.

Description

technical field [0001] The invention relates to the field of biodegradable materials, in particular to a fully biodegradable straw and a preparation method thereof. Background technique [0002] With the development of the polymer industry and the expansion of application fields, the waste of synthetic polymers is increasing year by year. Therefore, in order to prevent pollution, the demand for natural decomposition of polymers and return to nature is also becoming stronger. In the future, the research and development of synthetic polymers will be developed in two directions: improving durability and end-of-life according to their use. How to dispose of waste polymer materials that cannot be naturally degraded by the environment without polluting the environment, and how to develop and utilize environmentally degradable polymer materials are key issues in polymer green engineering. [0003] Currently, there are two methods for dealing with environmentally inert polymer wast...

AI Technical Summary

Problems solved by technology

(1) Soil burial method: Because polymers are not easy to degrade, this method often remains buried for dozens or even hundreds of years and takes up a lot of land. This method is not suitable for a country with a small land and a large population like our country.

(2) Incineration method: ordinary incineration will produce a large amount of harmful and toxic gases and residues, which will seriously pollute the environment and cannot be tolerated by environmental protection. Incineration, although it can convert all wastes into usable energy, but the investment is large, and there are still hidden dangers of exhaust gas pollution in the process of incineration, so this method is not perfect

This biodegradable plastic is only partially degraded, not fully degraded in the true sense. Although the starch is digested by bacteria, a large amount of polyethylene remains in the soil in the form of microspheres or flakes, or enters the water bodies of rivers, lakes and seas. cannot be ruled out, resulting in serious pollution

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