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A kind of reinforced and toughened polylactic acid composite material and preparation method thereof

A composite material, strengthening and toughening technology, applied in the field of biodegradable polymer materials, can solve the problems of reducing strength and rigidity, and achieve the effect that is conducive to wide application

Active Publication Date: 2020-01-31
浙江中科应化生态新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the technical problem that the strength and rigidity are significantly reduced while the toughness of the existing PLA is improved, and provides a reinforced and toughened polylactic acid composite material and a preparation method thereof, which can improve the strength and rigidity of the material while improving the toughness of the material

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  • A kind of reinforced and toughened polylactic acid composite material and preparation method thereof

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preparation example Construction

[0023] The preparation method of the above-mentioned reinforced and toughened polylactic acid composite material is characterized in that it comprises the following steps:

[0024] (1) Melt blending polylactic acid and filler according to the above ratio to obtain a polylactic acid composite material; the mixing conditions for melt blending are: temperature 175°C, rotation speed 50 rpm, time 5-8 minutes. Before melt blending, the polylactic acid and the filler were placed in a vacuum oven and dried in vacuum at 80°C for 24h. After melting and blending, the composite material is directly cooled at room temperature and air, and cut into small pieces, pressed into 1mm thick sheets on a flat vulcanizer at 180°C under a pressure of 10MPa, and then quickly placed under the cold press for preservation. Cool to room temperature under pressure to obtain a polylactic acid composite material.

[0025] (2) The polylactic acid composite material is uniaxially stretched to obtain a reinfor...

Embodiment 1

[0028] PLA (trade name is Natureworks 4032D, D-type lactic acid unit content is about 2%, weight average molecular weight is 207KDa) and nano silicon dioxide (primary particle average particle size is 15nm) are placed in a vacuum oven at 80 ℃ for vacuum drying 24h, the amount of filler added was 3wt%, weighed 58.2g PLA and 1.8g nano-silicon dioxide, and carried out melt blending in an internal mixer, the mixing conditions were: temperature 175°C, speed 50 rpm, time 5 minutes , until it is mixed evenly, the mixed sample is directly cooled at room temperature and air, and cut into small pieces, pressed into a 1mm thick sheet on a flat vulcanizer at 180 ° C under a pressure of 10 MPa, and then quickly placed in a cold Keep the pressure under the press and cool to room temperature. The pressed sheet was stretched on a universal tensile testing machine at 60°C at a tensile rate of 5mm / min to deformation ratios of 0.5 times, 2.0 times and 4.0 times, respectively, to obtain reinforce...

Embodiment 2

[0030] PLA (trade name is Natureworks 4032D, D-type lactic acid unit content is about 2%, weight average molecular weight is 207KDa) and nano-titanium dioxide (primary particle average particle size is 30nm) are placed in a vacuum oven at 80°C for 24h in vacuum, The amount of filler added is 2wt%. Weigh 58.8g PLA and 1.2g nano-titanium dioxide, and carry out melt blending in an internal mixer. Evenly, the mixed sample is directly cooled at room temperature and air, and cut into small pieces, pressed into a 1mm thick sheet on a flat vulcanizing machine at 180°C under a pressure of 10MPa, and then quickly placed under the cold press for preservation Cool to room temperature under pressure. The pressed sheet was stretched on a universal tensile testing machine at 60°C at a tensile rate of 5mm / min to a deformation ratio of 0.7 times and 1.5 times respectively to obtain a reinforced and toughened PLA composite material, and the enhanced and toughened PLA composite material was meas...

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Abstract

The invention discloses a reinforced and toughened PLA (polylactic acid) composite material and a preparation method thereof, and belongs to the technical field of preparation of biodegradable macromolecular materials, which can solve the technical problem of obvious reduction of strength and rigidity while the toughness of the existing PLA is improved. The reinforced and toughened PLA composite material is only prepared from PLA and filler component, without plasticizers, tougheners and other components, so that the number of mixing components is few, the cost of the raw materials is lower, and the strength and toughness can be simultaneously and obviously improved. The reinforced and toughened PLA composite material is prepared by a method with the following steps of melting, mixing, molding, forming and tensioning in a unidirectional way; the PLA composite material with high strength, high modulus and high toughness can be obtained when the unidirectional tension rate is lower. Thereinforced and toughened PLA composite material has the advantages that the preparation process is simple, clean and environmentally friendly; besides, the environment-friendly property of biodegradability is realized, and the PLA is suitable for being widely applied.

Description

technical field [0001] The invention relates to the technical field of biodegradable polymer materials, in particular to a reinforced and toughened polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a polymer material that is chemically synthesized after fermenting lactic acid from plant resources. After being discarded, it can be completely decomposed into water and carbon dioxide under the action of microorganisms, etc., without polluting the environment. It is a typical complete biodegradation plastic. Because PLA has the advantages of excellent biodegradability, biocompatibility, bioabsorbability and easy processing and molding, it is considered to be an ideal substitute for petroleum-based polymer materials, whether in the field of biomedical materials or in general plastics. fields, showing broad application prospects. In recent years, with the increase of production scale and the reduction of s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K3/36
CPCC08K3/36C08K2201/011C08L2201/06C08L67/04
Inventor 韩立晶陈云静董丽松
Owner 浙江中科应化生态新材料科技有限公司
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