Polylactic acid nanometer complex concurrently having toughness and strength, and preparation method thereof

Abstract

The present invention discloses a polylactic acid nanometer complex concurrently having toughness and strength, and a preparation method thereof, and belongs to the field of polymer materials, wherein the complex comprises a polylactic acid matrix resin, a toughening agent and a reinforcing agent. The preparation method comprises: adding natural latex and deionized water to a reactor, and adding potassium hydroxide and sodium lauryl sulfate; introducing protective gas, adding isopropyl alcohol, uniformly mixing, adding glycidyl methacrylate, heating, and adding an initiator and a catalyst; carrying out a reaction, drying, carrying out immersion washing, drying, extracting, and drying to obtain NR-g-GMA; adding polyethylene glycol, elemental sodium wire and toluene to the reactor, carrying out a reflux reaction, cooling, adding epibromohydrin, carrying out a reaction, filtering, adding the filtrate to ether, precipitating, washing, and drying to obtain PEG-EP; adding a NaOH solution to a cellulose nano-crystal aqueous solution, uniformly mixing, adding the PEG-EP, carrying out a reaction, carrying out dialysis, and drying to obtain CNC-g-PEG; and carrying out melt blending on the dried polylactic acid matrix resin, the NR-g-GMA and the CNC-g-PEG so as to obtain the complex.

Description

technical field [0001] The invention relates to a polylactic acid nanocomposite with both toughness and strength and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] In today's society, people pay more and more attention to the development and application of environmentally friendly polymer materials, among which polylactic acid (PLA) is a biodegradable polymer that is chemically synthesized from biological resources and has excellent physical properties. It has attracted special attention because of its mechanical properties and good biocompatibility, and has been widely used in packaging materials, agricultural mulch films, textiles, engineering plastics, and medical materials. However, the impact strength and tensile toughness of polylactic acid are low, and it is a brittle material, which is not suitable for occasions that require the material to undergo plastic deformation under relatively high stress. To this end...

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Problems solved by technology

[0004] At present, polylactic acid does not have both toughness and strength, which limits its use. One of the purposes of the present invention is to provide a polylactic acid nanocomposite with both toughness and strength. The compound utilizes modified natural rubber latex and modified natural latex. The simultaneous toughening and strengthening of polylactic acid can be achieved by using permanent cellulose nanocrystals, which can expand the use of polylactic acid in occasions that require high material toughness and strength; the second purpose is to provide a polylactic acid with both toughness and strength. A method for preparing a nanocomposite, the method improves the interfacial binding force between cellulose nanocrystals and polylactic acid by grafting polyethylene glycol on the surface of cellulose nanocrystals, and adopts emulsion polymerization to prepare glycidyl methacrylate grafted natural Latex to increase the polarity of natural latex

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