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Modified nano silica reinforcing and toughening polylactic acid composite material and preparation method thereof

A nano-silica, strengthening and toughening technology, which is applied in the field of modified nano-silica reinforced and toughened polylactic acid composite material and its preparation, can solve the problem that the composite material cannot achieve the performance, the surface energy of nano-silica is high, and the phase Poor tolerance and other problems, to achieve the effect of high crystallinity, improved mechanical properties, and improved compatibility

Inactive Publication Date: 2016-05-25
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-silica has been used in the modification of polymers, but the surface energy of nano-silica is high, it is easy to agglomerate in use, and the compatibility of nano-silica with most polymer materials is poor, composite materials Cannot achieve ideal performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Weigh 70 parts of polylactic acid (PLA), 10 parts of polybutylene carbonate (PBC), 0.3 parts of polystyrene grafted nano-silica, and 1680.1 parts of antioxidant; place the weighed PLA and PBC in Dry at 80°C for 6 hours;

[0038] (2) Stir the dried PLA, PBC, polystyrene-grafted nano-silica and antioxidant through a high-speed mixer for 5 minutes to form a mixed material;

[0039] (3) Put the mixed material into the hopper of the twin-screw extruder, melt and react, then extrude and pelletize.

[0040] The twin-screw extruder contains six zones, and the temperature and screw speed of each zone of the twin-screw extruder are: the temperature of the first zone is 70°C, the temperature of the second zone is 120°C, the temperature of the third zone is 130°C, the temperature of the fourth zone is 140°C, and the temperature of the fifth zone is 140°C. The zone temperature is 140°C, the sixth zone temperature is 140°C, the head temperature is 130°C; the screw speed is 120r / ...

Embodiment 2

[0042] (1) Weigh 90 parts of polylactic acid (PLA), 30 parts of polybutylene carbonate (PBC), 0.9 parts of polystyrene-grafted nano-silica, and 10100.5 parts of antioxidant. Dry at 80°C for 8 hours;

[0043] (2) Stir the dried PLA, PBC, modified nano-silica and antioxidant through a high-speed mixer for 7 minutes to form a mixed material;

[0044] (3) Put the mixed material into the hopper of the twin-screw extruder, melt and react, then extrude and pelletize.

[0045]The temperature and screw speed of each zone of the twin-screw extruder are as follows: the temperature of the first zone is 100°C, the temperature of the second zone is 220°C, the temperature of the third zone is 230°C, the temperature of the fourth zone is 230°C, the temperature of the fifth zone is 230°C, the temperature of the sixth zone is 240°C, the extruder Head temperature 200°C; screw speed 300r / min.

Embodiment 3

[0047] (1) Weigh 80 parts of polylactic acid (PLA), 20 parts of polybutylene carbonate (PBC), 0.6 parts of polystyrene grafted nano-silica, 10100.15 parts of antioxidant, 13300.15 parts of antioxidant, and weigh Dry PLA and PBC at 80°C for 7 hours;

[0048] (2) Stir the dried PLA, PBC, modified nano-silica and antioxidant through a high-speed mixer for 7 minutes to form a mixed material; (3) Put the mixed mixed material into the twin-screw extrusion In the hopper of the machine, it is melted and reacted, then extruded and granulated.

[0049] The temperature and screw speed of each zone of the twin-screw extruder are as follows: the temperature of the first zone is 85°C, the temperature of the second zone is 170°C, the temperature of the third zone is 180°C, the temperature of the fourth zone is 185°C, the temperature of the fifth zone is 185°C, the temperature of the sixth zone is 190°C, the extruder Head temperature 165°C; screw speed 210r / min.

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Abstract

The invention provides a modified nano silica reinforcing and toughening polylactic acid composite material and a preparation method thereof. The modified nano silica reinforcing and toughening polylactic acid composite material is prepared by mixing and extruding the following raw materials: 70-90 parts of polylactic acid, 10-30 parts of poly propylene carbonate 1,4-butylene terephthalate, 0.3-0.9 parts of polystyrene-grafted nano silica, and 0.1-0.5 parts of an anti-oxidant. According to the invention, polystyrene-grafted nano silica, PLA and PBC are subjected to melt blending in an extruder to prepare the reinforcing and toughening polylactic acid composite material, strength and toughness of the composite material can be increased, and crystallization performance of PLA and PBC can be greatly increased.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a modified nano-silica reinforced toughened polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) has attracted widespread attention in the industry for its good biodegradability and high mechanical properties. However, compared with petroleum-based engineering plastics widely used in industry, PLA's brittleness and low crystallization ability greatly limit its wide application. However, polybutylene carbonate (PBC), as a new type of biodegradable aliphatic polycarbonate synthesized from carbon dioxide, has excellent toughness. Therefore, the introduction of high-strength and toughness PBC during PLA processing can modify it, thereby greatly improving the impact resistance of PLA. [0003] Nano silica has high surface activity, high specific surface area, low specific gravity, high temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L69/00C08L51/10C08K9/04C08K3/36C08F292/00C08F212/08B29C47/92B29B9/06B29C48/92
Inventor 杨桂生刘凯
Owner HEFEI GENIUS NEW MATERIALS
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