Modified polylactic acid composite material and manufacturing method and application thereof

Abstract

The invention discloses a modified polylactic acid composite material. The modified polylactic acid composite material comprises the following components in parts by weight: 48-78.6 parts of polylactic acid resins, 5-15 parts of an inorganic filler and 15-30 parts of glass fibers. The inorganic filler is selected from one or a mixture of two of hollow glass micro-beads and hollow ceramic micro-beads; and the glass fibers are continuous fibers or chopped fibers with the diameter of 5-10 microns. The modified polylactic acid composite material is small in density and has the advantages of high heat resistance, high mechanical strength and good tensile property. In addition, when the mass compound ratio of the hollow glass micro-beads to hollow ceramic micro-beads ranges from 1:4 to 1:1, the polylactic acid composite material is high in heat resistance, high in mechanical strength and good in tensile property. The modified polylactic acid composite material disclosed by the invention can serve as a plastic product.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a modified polylactic acid composite material and its preparation method and application. Background technique [0002] Polylactic acid (PLA) is a renewable (bio-based synthetic resin) and biodegradable alternative to petroleum-based resins. In recent years, more researchers have researched and developed it. The environmental protection characteristics of polylactic acid composite materials make it have broad application prospects, but polylactic acid materials still have many shortcomings, such as high density, low strength, heat resistance, easy hydrolysis, etc., which greatly limit the replacement of polylactic acid by other existing materials. Application promotion of petroleum-based plastic materials. [0003] In the process of using glass fiber to reinforce resin, due to the complete incompatibility between glass fiber and resin on the microscopic interface, the ...

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Problems solved by technology

Especially when the diameter of the glass fiber is small, it is more difficult to achieve ideal dispersion and distribution of the glass fiber when modifying the polylactic acid resin, which is mainly reflected in the difficulty of improving the affinity between the glass fiber and the resin interface, so the overall composite material Performance can hardly be improved

At the same time, the diameter of the glass fiber should not be too large. Although the glass fiber with too large diameter has a good affinity with the resin interface, the larger the diameter, the worse the effect of glass fiber reinforcement.

In addition, when modifying polylactic acid, the fillers used are generally mineral fillers with high density, and the density of the produced polylactic acid composite material increases accordingly.

In view of the shortcomings of the above prior art, how to use glass fibers with a smaller diameter range to reinforce polylactic acid to produce a modified polylactic acid with good heat resistance, high mechanical strength, good tensile properties, and low density Composites are today's burning problem

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