Preparation method of starch/polylactic acid composite material capable of being quickly degraded

A composite material and rapid degradation technology, applied in the field of preparation of biodegradable materials, can solve the problems of composite materials such as decreased mechanical properties, weak interfacial bonding force, and poor compatibility, so as to speed up the degradation speed, improve compatibility, and reduce costs Effect

Active Publication Date: 2020-06-05
SHENZHEN FUHENG PLASTICS PIGMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the weak interfacial binding force between the two, the compatibility of the two after compounding is extremely poor, and the starch is easily agglomerated into granules in the polylactic acid, especially when the starch content is large, this phenomenon is further exacerbated. , resulting in a significant decrease in the mechanical properties of the composite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Weigh the starch and vacuum dry it to constant weight at 80°C, weigh the maleic anhydride, disperse the dried starch and maleic anhydride into acetone, then add polylactic acid, stir and disperse evenly to obtain a suspension;

[0020] 2) Add 700nm copper oxide nanoparticles to the suspension obtained in step 2), wherein the mass ratio of starch: maleic anhydride: polylactic acid: copper oxide is 1: 0.08: 0.6: 0.03, polylactic acid and acetone The mass-volume ratio of the mixture is 5:1g / mL. After uniform dispersion, the obtained mixed material liquid is transferred to a high-energy ball mill, and the high-energy ball mill reacts for 5 hours. The stirring speed is 8000rpm. Zirconia is used as the ball, and the ball-to-material ratio is 10: 1;

[0021] 3) the reaction product is washed with acetone, filtered, dried, and the washing filtrate is distilled and recovered;

[0022] 4) The dried product was press-molded at 170° C. and 20 MPa for 8 minutes to obtain a starc...

Embodiment 2

[0025] 1) Weigh the starch and vacuum dry it to constant weight at 80°C, weigh the maleic anhydride, disperse the dried starch and maleic anhydride into acetone, then add polylactic acid, stir and disperse evenly to obtain a suspension;

[0026] 2) Add 700nm copper oxide nanoparticles to the suspension obtained in step 2), wherein the mass ratio of starch: maleic anhydride: polylactic acid: copper oxide is 1: 0.08: 0.6: 0.03, polylactic acid and acetone The mass volume ratio of the mixture is 5:1g / mL. After the dispersion is uniform, the obtained mixed material liquid is transferred to a high-energy ball mill, and the high-energy ball mill is reacted for 3 hours, and the stirring speed is 6000rpm. Zirconia is used as the ball, and the ball-to-material ratio is 15: 1;

[0027] 3) the reaction product is washed with acetone, filtered, dried, and the washing filtrate is distilled and recovered;

[0028] 4) The dried product was press-molded at 170° C. and 20 MPa for 8 minutes to...

Embodiment 3

[0031] 1) Weigh the starch and vacuum dry it to constant weight at 80°C, weigh the maleic anhydride, disperse the dried starch and maleic anhydride into acetone, then add polylactic acid, stir and disperse evenly to obtain a suspension;

[0032] 2) Add 700nm copper oxide nanoparticles to the suspension obtained in step 2), wherein the mass ratio of starch: maleic anhydride: polylactic acid: copper oxide is 1: 0.08: 0.6: 0.03, polylactic acid and acetone The mass-volume ratio of the mixture is 5:1g / mL. After uniform dispersion, the obtained mixed material liquid is transferred to a high-energy ball mill, and the high-energy ball mill reacts for 4 hours. The stirring speed is 8000rpm. Zirconia is used as the ball, and the ball-to-material ratio is 13: 1;

[0033] 3) the reaction product is washed with acetone, filtered, dried, and the washing filtrate is distilled and recovered;

[0034] 4) The dried product was press-molded at 170° C. and 20 MPa for 8 minutes to obtain a starc...

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Abstract

The invention relates to a preparation method of a starch / polylactic acid composite material capable of being quickly degraded, and aims to solve the technical problem of how to improve the degradation speed ofcomposite materials and give consideration to the mechanical properties of the composite materials at the same time. The preparation method comprises the following steps: 1) weighing starchat 80 DEG C, carrying out vacuum drying to constant weight, weighing maleic anhydride, dispersing the dried starch and maleic anhydride into acetone, adding polylactic acid, and uniformly stirring anddispersing to obtain a turbid liquid; (2) adding copper oxide nanoparticles into the turbid liquid obtained in the step (2), uniformly dispersing, transferring anobtained mixed liquid into a high-energy ball mill, carrying out high-energy ball milling reaction for 3-5 hours at the stirring speed of 6000-8000 rpm, and taking zirconium oxide asmilling balls with the ball-to-material ratio of (10-15): 1; 3) washing a reaction product with acetone, filtering, drying, and distilling and recovering awashing filtrate, and 4) pressing and molding an obtaineddried product to obtain the starch / polylactic acid composite material.

Description

technical field [0001] The present application relates to a preparation method of a biodegradable material, especially a preparation method of a starch / polylactic acid composite degradable material. Background technique [0002] Polylactic acid is a polymer polyester formed by the ring-opening polymerization of lactide, a cyclic dimer of lactic acid, so it is also called polylactide. Polylactic acid has good strength, chemical inertness and easy processing, excellent biocompatibility and degradability, and is a renewable resource. Polylactic acid can be completely degraded into carbon dioxide and water after use, avoiding the problem of white pollution, and is a completely degradable environmentally friendly material. However, polylactic acid also has disadvantages such as poor hydrophilicity, high brittleness, poor impact resistance, long degradation cycle, etc., and polylactic acid is expensive, so its application is restricted. [0003] Starch is a completely degradable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/06C08L67/04C08K3/22C08B31/04
CPCC08B31/04C08K2003/2248C08K2201/003C08K2201/011C08L3/06C08L67/04C08L2201/06C08K3/22
Inventor 唐洁净
Owner SHENZHEN FUHENG PLASTICS PIGMENT
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