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Modified polylactic acid composite material and manufacturing method and application thereof

The technology of a composite material and a manufacturing method is applied in the field of modified polylactic acid composite material and its preparation, which can solve the problems of poor glass fiber reinforcement effect, high density, increased density of polylactic acid composite material, etc., so as to improve the tensile strength , The effect of improving mechanical properties and high tensile strength

Inactive Publication Date: 2016-12-07
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Modified polylactic acid composite material and manufacturing method and application thereof
  • Modified polylactic acid composite material and manufacturing method and application thereof
  • Modified polylactic acid composite material and manufacturing method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1-14 and comparative example 1-2

[0052] Examples 1-14 and Comparative Examples 1-2: Preparation of Modified Polylactic Acid Composite Materials

[0053] Each component is weighed according to the formula in Table 2, and it is produced by a melt blending extrusion process, and a single-screw extruder, a twin-screw extruder or a multi-screw extruder can be used, and the screw extruder has more than two Side feed port, the distance from side feed port to discharge port is not equal, control the processing temperature at 200°C~230°C, mix polylactic acid resin, dispersant, coupling agent and antioxidant in a high-speed mixer evenly , and then the mixed material is passed into the screw extruder from the main feed port, and the inorganic filler and glass fiber are mixed evenly and divided into more than two parts, which are respectively passed into the screw extruder from more than two side feed ports Middle; after melt blending, cooling, air-drying and granulation, the modified polylactic acid composite material w...

Embodiment 15-16

[0054] Embodiment 15-16: Preparation of modified polylactic acid composite material

[0055] The screw speed of the screw extruder is 300~500 rev / min, and there are two side feeding ports, the distance from one to the discharge port is 1 / 5~3 / 5 of the length of the screw extruder, and the other to The distance of the discharge port is 3 / 5~4 / 5 of the length of the screw extruder. All the other preparation methods are the same as in Examples 1-14.

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L51/00C08K13/04C08K7/28C08K7/24C08K7/14B33Y70/00B29C47/92B29C48/92
CPCB29C48/92B29C2948/9258B29C2948/92704B33Y70/00C08K2201/003C08L67/04C08L51/006C08K13/04C08K7/28C08K7/14C08K7/24
Inventor 周英辉陈瑶李其龙余启生程文超李禹函熊值汪伟平袁刚杨磊
Owner TONGJI UNIV
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