Polypropylene/cellulose intercalation nanometer crystal masterbatch, preparation method and application thereof

Abstract

The invention relates to a polypropylene/cellulose intercalation nanometer crystal masterbatch in the field of plastics. The polypropylene/cellulose intercalation nanometer crystal masterbatch comprises the following blended components: polypropylene and a cellulose intercalation nanometer crystal. The invention also discloses a preparation method and an application for the polypropylene/cellulose intercalation nanometer crystal masterbatch. The polypropylene/cellulose intercalation nanometer crystal masterbatch provided by the invention endows a cellulose nanometer crystal and polypropylene with good interfacial compatibility by utilizing intercalation modification of long-chain alkane in the cellulose intercalation nanometer crystal, significantly improves dispersity of the cellulose nanometer crystal in polypropylene and interfacial compatibility of the cellulose nanometer crystal and polypropylene, effectively improves the thermal degradation temperature of the cellulose nanometer crystal, and is applicable to the fields like advanced automotive materials, household appliance materials and medical and food packaging materials with high rigid requirements.

Description

technical field [0001] The invention relates to a polypropylene composition in the field of plastics, and furthermore relates to a polypropylene / cellulose intercalated nanocrystal masterbatch, a preparation method and application thereof. Background technique [0002] Cellulose is the natural biomass material with the most extensive sources and the largest reserves in nature. Under appropriate conditions, the β-1,4-glycosidic bond in the cellulose molecular chain in the amorphous region is preferentially broken to obtain rod-shaped cellulose nanocrystals (celllulosenanocrystals, CNCs) ( B.G. Acta Chemica Scandinavica, 1949, 3, 649-650.). The material has high crystallinity, mechanical strength, reactivity and transparency, huge specific surface area, good biocompatibility, and unique liquid crystal properties and chiral behavior (Moon R.J., Martini A., Nairn J ., Simonsen J., Youngblood J. Chemical Society Reviews, 2011, 40, 3941-3994.), has become a research hotspot in t...

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Problems solved by technology

For example, Khoshkava et al. (Khoshkava V., Kamal M.R. Biomacromolecules, 2013, 14, 3155-3163.) improved the compatibility of CNCs and polypropylene through the reaction of succinic anhydride on the surface of CNCs, and prepared CNCs reinforced polypropylene by melting tableting method , but surface succinic anhydride modified CNCs are poorly dispersed in polypropylene; Ljungberg et al. (Ljungberg N., Bonini C., Bortolussi F., Boisson C., Heux L., Cavaillé J.Y. -2739.) Adsorb TX-10 phosphate surfactant on the surface of CNCs to improve the compatibility between CNCs and random polypropylene, and prepare CNCs reinforced random polypropylene film by casting film method, but TX-10 phosphoric acid at high temperature Ester surfactants are easy to desorb from the surface of CNCs, which greatly restricts the use of CNCs-enhanced random polypropylene films in high-temperature environments; Nagalakshmaiah et al. 8755-8764.) Electrostatically adsorb quaternary ammonium salts on the surface of CNCs to improve the compatibility between CNCs and polypropylene, and prepare CNCs reinforced polypropylene by melt extrusion, but quaternary ammonium salts are easy to decompose from the surface of CNCs in strong acid and alkali environments separation, which greatly limits the use of CNCs reinforced polypropylene in acid-base environments

Although the above work can play a certain role in improving the compatibility between CNCs and polypropylene and improving the low Young's modulus of the original polypropylene material, there are still poor compatibility between CNCs and polyacrylic acid, and the thermal degradation temperature of CNCs is difficult to meet the melting temperature. Blending and extrusion processing, CNCs reinforced polypropylene materials are limited in scope of use, etc.

In addition, the problem of catalytic thermal degradation of CNCs induced by surface sulfate anions still exists, which also greatly affects the quality of CNCs reinforced polypropylene materials.

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