Super-tough polylactic acid-based nanocomposite material with balanced rigidity and toughness and preparation method thereof

Abstract

The invention discloses a rigidity-toughness balanced super-toughness polylactic acid-based nano composite material. The rigidity-toughness balanced super-toughness polylactic acid-based nano composite material is prepared from the following raw materials in parts by mass: 70 to 90 parts of polylactic acid, 10 to 30 parts of natural rubber, 0.5 to 3 parts of fumed silica, 0.2 to 1 part of antioxidant, 0.1 to 0.9 part of cross-linking agent, and 0.01 to 0.09 part of assistant crosslinker; the fumed silica is nanoscale white carbon black; a phase state of the nano composite material is a dual continuous phase; when in preparation, the fumed silica is firstly uniformly mixed with the natural rubber; and then the polylactic acid and the antioxidant are uniformly mixed, mixed rubber of the natural rubber and the fumed silica is added and uniformly mixed, then the cross-linking agent and the assistant crosslinker are added, so that the mixed rubber is dynamically vulcanized under the effect of the cross-linking agent, and finally the rigidity-toughness balanced super-toughness polylactic acid-based nano composite material is obtained. The impact strength of the polylactic acid-based nano composite material is significantly improved, and the tensile strength is also slightly improved.

Description

technical field [0001] The invention relates to a polylactic acid-based nanocomposite material, in particular to a super-tough polylactic acid-based nanocomposite material with balanced rigidity and toughness and a preparation method thereof; it belongs to the technical field of nanocomposite materials and its preparation. Background technique [0002] Today, when petroleum resources are increasingly scarce, the prices of its raw materials and various chemical products derived from them have also risen accordingly. Among them, petroleum-based plastic products can be seen everywhere in our daily life, and provide many conveniences for our life and work. However, with the development of time, a major defect of this kind of products has gradually emerged, that is, they cannot be completely biodegraded, and these petroleum-based wastes cannot be recycled and reused. The living environment of humans and animals has been affected. Great threat. For environmental protection and s...

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Problems solved by technology

But this invention does not adopt nano-scale white carbon black, and micron-scale white carbon black does not have excellent reinforcing effect; And it is not realized that nano-scale white carbon black is not mixed with natural rubber in advance, which will lead to nano-scale white carbon black in aggregate Inappropriate distribution of lactic acid / natural rubber in different phases, limited performance improvement; in addition, the invention uses maleic anhydride grafted polyethylene as a macromolecular compatibilizer to compatibilize polylactic acid and natural rubber / thermal vulcanized silicone rubber ; Simultaneously, adopt coupling agent (such as gamma glycidyl propyl trimethyloxysilane and sodium orthosilicate compound) as the small molecule modification compatibilizer of system; The natural rubber vulcanizing agent that it uses is sulfur; The sulfur used cannot cause the graft reaction between natural rubber and polylactic acid, that is to say, the sulfur vulcanizing agent cannot improve the combination of polylactic acid and natural rubber.

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