Functional nano SiO2/polypropylene carbonate composite material and preparation method therefor

Abstract

The invention relates to a functional nano SiO2 / polypropylene carbonate composite material and a preparation method therefor. In the composite material, a mas ratio of the polypropylene carbonate to the functional nano SiO2 is 100 to (0.5-6); and the composite material is prepared by fusing and blending the polypropylene carbonate and the functional nano SiO2. The functional nano SiO2 is prepared by virtue of an in-situ modifying technology. The functional nano SiO2 / polypropylene carbonate composite material provided by the invention has relatively good comprehensive performance, tensile strength of 17-37MPa, a glass-transition temperature of 30-39 DEG C, a maximum thermal decomposition temperature of 279-296 DEG C and elongation at break higher than 200%. A film prepared by the composite material has relatively good light transmission, so that the applied range, in the agricultural field, the food field and the packaging field, of the polypropylene carbonate is expanded; and the preparation method for the composite material is simple, and convenient for popularization and use.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, in particular to a functional nano-SiO 2 / polypropylene carbonate composite material and preparation method. Background technique [0002] Polypropylene carbonate (PPC) is an alternating copolymer of carbon dioxide and propylene oxide. Because of its excellent properties such as biodegradability, biocompatibility, high transparency, flexibility and gas barrier properties, it is used in It has a very broad application prospect in the field of medicine and packaging materials. However, the glass transition temperature (T g ) low, poor thermal stability and mechanical strength, which greatly limit its promotion and use. [0003] In order to improve the performance of polypropylene carbonate, a series of studies on the modification of polypropylene carbonate have been carried out at home and abroad. Among them, the composite of polypropylene carbonate and inorganic nanomaterials i...

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Problems solved by technology

There are also patent reports at present, such as Chinese patent CN103540114A discloses aliphatic polycarbonate resin composition, adopts amorphous silicon dioxide and aliphatic polycarbonate to combine, the tensile strength of the obtained composition is at 35MPa, but the fracture of the obtained composition The elongation is lower than 200%, and the toughness is relatively poor

Chinese patent CN103788613A discloses a degradable nano-SiO2 / polypropylene carbonate composite film and its preparation method. The nano-SiO2 used is gas phase hydrophobic nano-SiO2, the resulting composite membrane material has a relatively high Tg (35.2-42.1°C), but its tensile strength is between 7.63-12.97MPa, and the modification effect is limited. Moreover, the organic solvents that pollute the environment are used for blending, which limits its popularization and use

The reason why the modification effect of ordinary nano-SiO2 on polypropylene carbonate is relatively poor, the main reason is that the polarity of ordinary nano-SiO2 does not match polypropylene carbonate , resulting in poor compatibility between the two, and nano-SiO2 cannot be effectively dispersed in the matrix, which affects the manifestation of nano-SiO2 nano-characteristics

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