A toughened modified polylactic acid-polybutylene adipate terephthalate composite material and a preparing method thereof

Abstract

A toughened modified polylactic acid-polybutylene adipate terephthalate composite material and a preparing method thereof is disclosed. The composite material includes, by weight, 80-90 parts of polylactic acid, 20-30 parts of polybutylene adipate terephthalate, 10-15 parts of triethyl citrate, 6-10 parts of vegetable oil polyol, 7-10 parts of talc powder and 7-10 parts of diatomite. In the composite material, the triethyl citrate and the vegetable oil polyol are synergistic, can improve the degree of dispersion of the dispersion phase and can improve toughness; the triethyl citrate itself hasa plasticization function, can reduce the glass transition temperature of the composite material, and is low in molecular weight so that the enzyme degradation rate can be increased; the talc powderand the diatomite, as fillers, reduce the manufacturing cost, and are synergistic with the vegetable oil polyol to play a role of a nucleating agent, thus increasing the glass transition temperature of glass and improving thermal deformation temperature of the material.

Description

technical field [0001] The invention relates to the field of biodegradable composite materials, in particular to a composite material of toughened modified polylactic acid and polybutylene adipate terephthalate and a preparation method thereof. Background technique [0002] Polylactic acid is the most researched and applied biodegradable and renewable aliphatic polyester. The molecular chain of polylactic acid is rigid, its glass transition temperature is about 60°C, and it is in a hard glass state at room temperature. [0003] Similar to PS, high modulus and high strength but high brittleness, high tensile strength, higher than PS, high-density polyethylene ( [0004] HDPE), polypropylene (PP), but the notched impact strength is lower than these three, the elongation at break is 4%, higher than [0005] PS, but lower than PP and HDPE, poor toughness has become the biggest obstacle limiting the wide application of polylactic acid. [0006] Polybutylene adipate terephthalat...

AI Technical Summary

Problems solved by technology

However, the two phases of polylactic acid and polybutylene adipate terephthalate are only partially compatible. In order to solve the problem of compatibility between the two, a polymer compatibilizer needs to be added, but the addition of a polymer compatibilizer will affect the Biodegradability of composite materials

Moreover, the price of polylactic acid increases, which limits its popularization and application. In order to reduce costs, fillers are often added, but the addition of fillers will affect its toughness and other mechanical characteristics and biodegradability.

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