Preparation method of chitosan fiber reinforced polylactic acid composite material

A technology of chitosan fiber and composite materials, which is applied in the material and preparation of orthopedic internal fixation devices, and in the field of preparation of chitosan fiber-reinforced polylactic acid composite materials. The use range of lactic acid composite materials, the bending strength of human cortical bone and other problems can not be achieved, and the effect of good mechanical properties, high bending strength and easy industrial production can be achieved.

Inactive Publication Date: 2012-09-05
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the above patents, it can be seen that polylactic acid is reinforced with a single chitin fiber or a single modified chitin fiber, and its bending strength is not high, which cannot reach the bending strength of human cortical bone of 176-205MPa, which limits the polylactic acid composite material scope of use
If a multi-component composite system is used, although it can reach or exceed the bending strength of human cortical bone, its formation and degradation mechanism and actual effect are more complicated
[0006] The existing preparation methods basically belong to conventional polymer processing methods, and most of the prepared products can only achieve ordinary compounding, which has a certain enhancement effect, but the performance improvement is relatively small

Method used

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  • Preparation method of chitosan fiber reinforced polylactic acid composite material
  • Preparation method of chitosan fiber reinforced polylactic acid composite material
  • Preparation method of chitosan fiber reinforced polylactic acid composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 20% by weight of racemic polylactic acid (viscosity-average molecular weight 200,000) and 80% by weight of chitosan fibers (deacetylation degree 75%, viscosity-average molecular weight 150,000) were respectively placed in a vacuum oven, vacuum Temperature 0.06Pa, temperature 40°C, remove free moisture and impurities for 48 hours, purify polylactic acid and chitosan fiber raw materials, dissolve polylactic acid in methylene chloride solvent, and the mass concentration of polylactic acid is 20%. Add chitosan fiber to make the polylactic acid fully infiltrate the chitosan fiber, and further vacuum dry (vacuum degree 0.06Pa, temperature 40°C, remove free moisture and impurities for 48 hours) after the solvent evaporates to obtain a chitosan fiber / polylactic acid mixture .

[0027] Put the obtained chitosan fiber / polylactic acid mixture into the mold in a random orientation arrangement according to the mold size and molding requirements, and place it on a vacuum flat vulcani...

Embodiment 2

[0030] 95% by weight of D-polylactic acid (1,000,000 viscosity-average molecular weight), 5% by weight of chitosan fiber (30% degree of deacetylation, 600,000 viscosity-average molecular weight) were respectively placed in a vacuum oven, the vacuum degree 0.06Pa, temperature 40°C, remove free water and impurities for 48 hours, purify polylactic acid and chitosan fiber raw materials, dissolve polylactic acid in chloroform solvent, and the mass concentration of polylactic acid is 20%. Add chitosan fiber to make the polylactic acid fully infiltrate the chitosan fiber, and further vacuum dry (vacuum degree 0.06Pa, temperature 40°C, remove free moisture and impurities for 48 hours) after the solvent evaporates to obtain a chitosan fiber / polylactic acid mixture .

[0031] Put the obtained chitosan fiber / polylactic acid mixture into the mold in a uniaxial orientation arrangement according to the mold size and molding requirements, and place it on a vacuum flat vulcanizer at a tempera...

Embodiment 3

[0033] 50% by weight of L-polylactic acid (viscosity-average molecular weight 100,000) and 50% by weight of chitosan fibers (deacetylation degree 90%, viscosity-average molecular weight 100,000) were respectively placed in a vacuum drying oven with a vacuum degree of 0.06 Pa, temperature 40 DEG C, remove free moisture and impurity in 48 hours, purify polylactic acid, chitosan fiber raw material, polylactic acid is dissolved in acetonitrile solvent, the mass concentration of polylactic acid is 20%. Add chitosan fiber to make the polylactic acid fully infiltrate the chitosan fiber, and further vacuum dry (vacuum degree 0.06Pa, temperature 40°C, remove free moisture and impurities for 48 hours) after the solvent evaporates to obtain a chitosan fiber / polylactic acid mixture .

[0034] Put the obtained chitosan fiber / polylactic acid mixture into the mold with a 0° / 90° orientation structure according to the mold size and molding requirements, and put it into the mold on a vacuum fla...

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Abstract

The invention discloses a preparation method of a chitosan fiber reinforced polylactic acid composite material, which comprises the following steps: dissolving a purified polylactic acid in a solvent, adding purified chitosan fibers, fully infiltrating the chitosan fibers in the polylactic acid, and carrying out vacuum drying after the volatilization of the solvent to obtain a chitosan fiber / polylactic acid mixture; and placing the mixture in a mold in random orientation or uniaxial orientation or 0-degree / 90-degree orientation or 0-degree / +45-degree / -45-degree / 0-degree orientation, and carrying out compression molding on a vacuum flat-plate vulcanizing machine under the conditions of 20-230 DEG C, 1-200MPa and 0.01-100000Pa to obtain the composite material. The preparation method has theadvantages that the quality of the raw materials is improved, the chitosan / polylactic acid composite material with good interface compatibility can be obtained without adding interface compatilizer or carrying out other interface processing, and the negative effects possibly caused by multicomponent and multiprocessing steps can be avoided.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a material and a preparation method of an orthopedic internal fixation device, in particular to a preparation method of a chitosan fiber-reinforced polylactic acid composite material. Background technique [0002] Traditional orthopedic internal fixation devices mainly use metal materials such as titanium alloy and stainless steel. This kind of metal material device has stable mechanical properties and good shape retention. It can accurately reset the fracture and promote bone healing. It is currently the main choice for the treatment of fractures. However, long-term clinical tests have found that such metal material devices have many shortcomings. The use of biodegradable medical polymer material devices to replace metal material devices is the main development trend. Biodegradable polymer materials currently used in clinical practice mainly include polylactic acid, polyglycol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L5/08C08J5/04B29C35/02A61L31/12
Inventor 黎明庆周长忍
Owner JINAN UNIVERSITY
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