Starch-based degradable straw material and preparation method thereof

Abstract

The invention discloses a starch-based degradable straw material and a preparation method thereof, and belongs to the technical field of high polymer materials, the starch-based degradable straw material comprises the following components by weight: 60-80 parts of PLA, 3-7 parts of PBAT, 5-30 parts of starch, 3-10 parts of a plasticizer, 0.5-1 part of a nucleating agent, 0.5-1 part of erucyl amide, and 0.5-2 parts of a hyperbranched auxiliary agent; the preparation method of the starch-based degradable straw material comprises the following steps: carrying out high-speed melt blending on PLA, PBAT, starch, a plasticizer, a nucleating agent, erucyl amide and hyperbranched resin, and carrying out extrusion processing to obtain the starch-based degradable straw material. The starch-based degradable straw material has high heat resistance, high toughness and biodegradability.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a starch-based degradable straw material and a preparation method thereof. Background technique [0002] Biodegradable plastics, also known as biodegradable plastics, refer to the action of microorganisms existing in nature under natural conditions such as soil and / or sandy soil, and / or under specific conditions such as composting conditions or anaerobic digestion conditions or in aqueous culture fluids. cause degradation, and eventually complete degradation into carbon dioxide (CO 2 ) or / and methane (CH 4 ), water (H 2 O) and mineralized inorganic salts of the elements it contains and plastics from new biomass. Polylactic acid (PLA) is a completely biodegradable polymer with similar mechanical properties to PET. It can replace PET in many application fields, such as making cups, lunch boxes, lids, etc., while the current market uses knives, forks, spoons, Most of t...

AI Technical Summary

Problems solved by technology

However, the introduction of inorganic substances and glass fiber will greatly reduce the fluidity of polylactic acid. It is difficult for the melt to fill the mold during the injection molding process, and stable injection molding cannot be performed. In addition, the addition of inorganic fillers may cause uneven mixing, mixing and running during processing. powder problem

On the other hand, the core is an elastomer with a core-shell structure, and the core layer is polybutadiene or polyisoprene; the shell layer is composed of styrene and polyD-lactic acid, polybutadiene or polyisoprene It is a non-degradable material. The introduction will affect the degradation of polylactic acid. The elastomer of the core-shell structure is expensive, and it is difficult to achieve the toughening effect by adding 5%. % of organic components are added, and its degradability must be considered, so it is not a good strategy to use core-shell elastomers for toughening

[0004] In order to improve the heat resistance of polylactic acid, increase the toughness of polylactic acid, reduce material costs, and overcome the shortcomings of low heat resistance, high material brittleness, and high cost, a starch-based degradable material with heat resistance, toughness, and low cost has been developed. The straw material and its preparation method can be degraded into carbon dioxide and water in 3-6 months under composting conditions, and the relative biodegradation rate is >90%.