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Polylactic acid-esterified starch-attapulgite composite material and preparation method thereof

The technology of attapulgite and esterified starch is applied in the field of polylactic acid-esterified starch-attapulgite composite material and its preparation, which can solve the problems that the mechanical properties are difficult to reach the biomedical material, the thermal stability of the material is poor, etc. Performance and thermal stability, high tensile and flexural strength, cost reduction effect

Inactive Publication Date: 2015-06-24
SUZHOU VIVOTIDE BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal stability of the blended materials is poor, and the mechanical properties are difficult to meet the standards of biomedical materials. Therefore, the modification of polylactic acid and starch blends still needs further research.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A polylactic acid-esterified starch-attapulgite composite material, comprising the following components in parts by weight: 48 parts of polylactic acid, 38 parts of maleic anhydride esterified starch, 8 parts of attapulgite, and 2 parts of sodium alginate , 2 parts of glycerin, 1 part of carboxymethyl chitosan and 1 part of dioctyl oxalate.

[0021] The preparation method comprises the steps of:

[0022] (1) Dissolve carboxymethyl chitosan in an acetic acid solution with a volume fraction of 2%, and prepare an acetic acid solution of carboxymethyl chitosan, stir it evenly, and let it stand for use;

[0023] (2) Dissolve attapulgite in 3 times the volume of deionized water, and disperse it ultrasonically for 5 minutes to obtain attapulgite suspension, which is left to stand for use;

[0024] (3) Add polylactic acid to the acetic acid solution of carboxymethyl chitosan prepared in step (1), mix evenly, add attapulgite suspension and remaining raw materials while stirring...

Embodiment 2

[0026] A polylactic acid-esterified starch-attapulgite composite material, comprising the following components in parts by weight: 52 parts of polylactic acid, 40 parts of maleic anhydride esterified starch, 10 parts of attapulgite, and 3 parts of sodium alginate , 3 parts of glycerin, 2 parts of carboxymethyl chitosan and 2 parts of triethyl phosphate.

[0027] The preparation method comprises the steps of:

[0028] (1) Dissolve carboxymethyl chitosan in an acetic acid solution with a volume fraction of 3%, and prepare an acetic acid solution of carboxymethyl chitosan, stir it evenly, and let it stand for use;

[0029] (2) Dissolve attapulgite in 3 times the volume of deionized water, and disperse it ultrasonically for 6 minutes to obtain attapulgite suspension, which is left to stand for use;

[0030] (3) Add polylactic acid to the acetic acid solution of carboxymethyl chitosan prepared in step (1), mix evenly, add attapulgite suspension and remaining raw materials while st...

Embodiment 3

[0032] A polylactic acid-esterified starch-attapulgite composite material, comprising the following components in parts by weight: 53 parts of polylactic acid, 41 parts of maleic anhydride esterified starch, 11 parts of attapulgite, and 3 parts of sodium alginate , 3 parts of glycerin, 2 parts of carboxymethyl chitosan and 2 parts of dioctyl oxalate.

[0033] The preparation method comprises the steps of:

[0034] (1) Dissolve carboxymethyl chitosan in an acetic acid solution with a volume fraction of 4%, and prepare an acetic acid solution of carboxymethyl chitosan, stir it evenly, and let it stand for use;

[0035] (2) Dissolve attapulgite in 4 times the volume of deionized water, and disperse it ultrasonically for 8 minutes to obtain attapulgite suspension, which is left to stand for use;

[0036] (3) Add polylactic acid to the acetic acid solution of carboxymethyl chitosan prepared in step (1), mix evenly, add attapulgite suspension and remaining raw materials while stirr...

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PUM

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Abstract

The invention provides a polylactic acid-esterified starch-attapulgite composite material and a preparation method thereof. The polylactic acid-esterified starch-attapulgite composite material comprises the following components in parts by weight: 48-58 parts of polylactic acid, 38-44 parts of esterified starch, 8-16 parts of attapulgite, 2-5 parts of alginate, 2-5 parts of glycerol, 1-3 parts of carboxymethyl chitosan and 1-2 parts of plasticizer. The preparation method comprises the following steps: (1) preparing a carboxymethyl chitosan acetic acid solution; (2) dissolving the attapulgite in deionized water, and carrying out ultrasonic dispersion to obtain an attapulgite suspension; and (3) adding the polylactic acid into the carboxymethyl chitosan acetic acid solution, uniformly mixing, adding the attapulgite suspension the surplus material while stirring, thoroughly mixing to form a composite sol, coating a film on glass by flow casting, and carrying out vacuum drying. Compared with the polylactic acid, the polylactic acid-esterified starch-attapulgite composite material has the advantages of higher tensile strength, higher bending strength, high heat stability and lower cost.

Description

technical field [0001] The invention relates to the field of biological materials, in particular to a polylactic acid-esterified starch-attapulgite composite material and a preparation method thereof. Background technique [0002] Polylactic acid is a partially crystalline polymer that can form a thermodynamically compatible or partially compatible blend system with many polymers. Polylactic acid has good biocompatibility and biodegradability, but due to its biodegradability The high price of polylactic acid makes it difficult to be widely used. Blending polylactic acid and starch to prepare environmentally friendly degradable composite materials, replacing traditional polyolefin resins, can not only make the materials fully biodegradable, but also reduce the dependence on non-renewable petrochemical resources. Based on the consideration of food safety, The country has successively promulgated relevant policies to strengthen the protection of grain starch, and the develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/06C08L5/04C08L5/08C08K3/34C08K5/053C08J5/18
Inventor 潘林根殷飞郭玉芹
Owner SUZHOU VIVOTIDE BIOTECH