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.
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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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