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Reinforced and toughened composite material and preparation method thereof

A composite material and toughening type technology, which is applied in the field of preparation of the reinforced and toughened composite material, can solve the problems of poor tensile properties of the composite material, general rare earth nucleating agent, etc., so as to improve the tensile strength and fracture The effect of elongation

Active Publication Date: 2020-04-21
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent document uses a rare earth nucleating agent as a nucleating agent to prepare a biodegradable polylactic acid thermally conductive composite material, the rare earth nucleating agent involved is too general, and it is impossible to know which rare earth nucleating agent to use , and the tensile properties (24.2MPa) of the resulting composite are still not good, and do not involve the elongation at break of the above thermally conductive composite

Method used

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preparation example Construction

[0036]

[0037] The preparation method of the reinforced and toughened composite material of the present invention comprises the following steps: (1) the preparation step of the mixing material; (2) the processing step of the mixing material.

[0038] In step (1), the preparation step of the mixed material is: after mixing PLA, PBAT, nano-lanthanum oxide, antioxidant, epoxy compound and citrate plasticizer, place it in an internal mixer and knead , to get the mixture. The proportioning of PLA, PBAT, nano-lanthanum oxide, antioxidant, epoxy compound and citrate plasticizer is as described above, and will not be repeated here. The kneading temperature may be 160-190°C, preferably 170-180°C. The mixing time may be 3-10 minutes, preferably 4-8 minutes, more preferably 4-6 minutes. In this way, the nano-lanthanum oxide, epoxy compound and citrate plasticizer can better play a synergistic role, promote the mutual compatibility of PLA and PBAT, and improve the tensile strength an...

Embodiment 1

[0052] Reinforced and toughened composite material, its raw materials include by weight percentage: 75.5wt% of PLA, 20wt% of PBAT, 3wt% of nano-lanthanum oxide, 0.6wt% of antioxidant, 0.6wt% of epoxy compound, citrate plasticizer 0.3 wt%.

[0053] Preparation of nanometer lanthanum oxide (nitrate thermal decomposition method):

[0054] The lanthanum nitrate is directly calcined at 800°C for 6 hours to prepare nano lanthanum oxide with a particle size less than 50nm.

[0055] Preparation of reinforced and toughened composite materials:

[0056] After mixing PLA, PBAT, nano-lanthanum oxide, antioxidant, epoxy compound and citrate plasticizer according to the above ratio, put them in an internal mixer and mix them at a temperature of 175°C. The time is 5 minutes to obtain the mixed material; use the double-roller open mill to compress the above-mentioned mixed material, the temperature of the front roll is 120°C, the temperature of the rear roll is 195°C, the roll distance is 0...

Embodiment 2

[0058] Reinforced and toughened composite material, its raw materials include by weight percentage: 75.5wt% of PLA, 20wt% of PBAT, 3wt% of nano-lanthanum oxide, 0.6wt% of antioxidant, 0.6wt% of epoxy compound, citrate plasticizer 0.3 wt%.

[0059] Preparation of nanometer lanthanum oxide (precipitation method):

[0060] Lanthanum nitrate and ammonium bicarbonate were dissolved in distilled water respectively to obtain lanthanum nitrate solution and ammonium bicarbonate solution, wherein the molar ratio of lanthanum nitrate and ammonium bicarbonate was 1:3.3; then the above-mentioned lanthanum nitrate solution and ammonium bicarbonate solution Mix and stir at room temperature for 6 hours, and centrifuge to obtain a precipitate; dry the above precipitate at 800°C for 6 hours after drying at 110°C to prepare nano-lanthanum oxide with a particle size of less than 50nm.

[0061] Preparation of reinforced and toughened composite materials:

[0062] After mixing PLA, PBAT, nano-lan...

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Abstract

The invention discloses a reinforced and toughened composite material and a preparation method thereof. The reinforced and toughened composite material is prepared from the following raw materials: 30to 90 weight percent of PLA, 5 to 55 weight percent of PBAT, 0.5 to 8 weight percent of nano lanthanum oxide, 0.05 to 5 weight percent of an antioxidant, 0.05 to 5 weight percent of an epoxy compoundand 0.05 to 5 weight percent of a citrate plasticizer, wherein the PLA is polylactic acid, and the PBAT is polybutylene adipate-co-terephthalate. The reinforced and toughened composite material disclosed by the invention contains the nano lanthanum oxide, the epoxy compound and the citrate plasticizer, so that the tensile strength and the elongation at break of the reinforced and toughened composite material can be greatly improved.

Description

technical field [0001] The invention relates to a reinforced and toughened composite material, and also relates to a preparation method of the reinforced and toughened composite material. Background technique [0002] Polylactic acid (PLA) is a new type of green biomaterial that can be completely degraded. It has good biocompatibility and degradability. It can be processed by injection molding, extrusion, spinning and other processes to make fibers, films, and sheets. Materials, plates, etc., products can be widely used in clothing, packaging, agriculture, automobiles, electronics, biomedicine, tissue engineering and many other fields. Although PLA has many advantages, its performance defects such as poor tensile properties and poor crystallization properties still restrict its application in many fields. [0003] In recent years, people have modified polylactic acid materials in various ways. For example, CN104194294B discloses a kind of PLA / PBAT composite material and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08L91/00C08K3/22C08K5/11C08K5/134
CPCC08L67/04C08K2201/011C08K2003/221C08L2205/03C08L2205/08C08L67/02C08L91/00C08K3/22C08K5/11C08K5/1345
Inventor 曹露雅崔凌霄曹鸿璋李波葛瑞祥王慧于晓丽张玉玺陈明光吴豪芦婷婷白雪周晓东
Owner BAOTOU RES INST OF RARE EARTHS
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