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Polylactic acid porous material containing fibrous pores and preparation method thereof

A technology of porous materials and polylactic acid, which is applied in the field of porous materials, can solve the problems of difficult control of the pore structure of porous materials, the use of organic solvents, and insufficient mechanical strength, and achieve the effects of clean and environmentally friendly preparation process, high porosity, and improved mechanical strength

Active Publication Date: 2021-07-09
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a polylactic acid porous material containing fibrous pores and a preparation method thereof in order to solve the technical problems that the pore structure of the porous material is difficult to control, the use of organic solvents, and the mechanical strength are insufficient in the prior art

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  • Polylactic acid porous material containing fibrous pores and preparation method thereof
  • Polylactic acid porous material containing fibrous pores and preparation method thereof
  • Polylactic acid porous material containing fibrous pores and preparation method thereof

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preparation example Construction

[0041] The preparation method of the polylactic acid porous material containing fibrous hole of the present invention, comprises the following steps:

[0042] Step 1, blending 90wt%-50wt% polylactic acid and 10wt%-50wt% polycaprolactone to obtain a polylactic acid blend material;

[0043] Step 2: Stretching the polylactic acid blend material uniaxially, the stretching temperature is 55-80°C, and the stretch ratio is 1.0-6.0 times, to obtain the polylactic acid blend material containing fibers;

[0044] Step 3, immersing the fiber-containing polylactic acid blend material in a solution containing microorganisms or enzymes, degrading and removing the polycaprolactone component to obtain a porous body;

[0045] Step 4: Rinse the porous body and dry it to a constant weight to obtain a polylactic acid porous material containing fibrous pores.

[0046] In the above technical solution, in step 1, the blending method is not particularly limited, preferably melt blending in an interna...

Embodiment 1

[0057] Step 1. Melt blend polylactic acid and polycaprolactone at a weight ratio of 80 / 20 at 175°C in an internal mixer at a speed of 60 rpm for 8 minutes, and then make a sheet to obtain polylactic acid co- mixed material;

[0058] Step 2. Use a universal tensile testing machine to uniaxially stretch the polylactic acid blend material. The stretching temperature is 60°C, the stretching rate is 10mm / min, and the stretching ratio is 2.7 times to obtain polylactic acid containing fibers. blended materials;

[0059] Step 3. Put the brittle section of the stretched polylactic acid blend material containing fibers into the phosphate buffer solution (pH=8) containing Pseudomonas mendocida along the stretching direction, shake at 30°C and 140rpm Oscillate in the bed, selectively degrade and remove the polycaprolactone fibers to obtain a porous body;

[0060] Step 4: Rinse the porous body and dry it to a constant weight to obtain a polylactic acid porous material containing fibrous ...

Embodiment 2

[0063] Step 1. Melt blend polylactic acid and polycaprolactone at a weight ratio of 80 / 20 at 175°C in an internal mixer at a speed of 60 rpm for 8 minutes, and then make a sheet to obtain polylactic acid co- mixed material;

[0064] Step 2. Use a universal tensile testing machine to uniaxially stretch the polylactic acid blend material. The stretching temperature is 60°C, the stretching rate is 5mm / min, and the stretching ratio is 4.3 times to obtain polylactic acid containing fibers. blended materials;

[0065] Step 3. Put the brittle section of the stretched polylactic acid blend material containing fibers into the phosphate buffer solution (pH=8) containing Pseudomonas mendocida along the stretching direction, shake at 30°C and 140rpm Oscillate in the bed, selectively degrade and remove the polycaprolactone fibers to obtain a porous body;

[0066] Step 4: Rinse the porous body and dry it to a constant weight to obtain a polylactic acid porous material containing fibrous p...

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Abstract

The invention relates to a polylactic acid porous material containing fibrous pores and a preparation method thereof, belongs to the technical field of porous materials, and solves the technical problems that in the prior art, the pore structure of a porous material is difficult to control, an organic solvent is used, and mechanical strength is insufficient. According to the polylactic acid porous material containing the fibrous pores, polylactic acid serves as a matrix, a plurality of pores are randomly distributed in the matrix and are in a fiber form arranged in parallel in the same direction, and the porosity is 1-50%. The porous material not only has biodegradability, but also has high mechanical strength. The invention further provides the preparation method of the polylactic acid porous material containing the fibrous pores, the preparation method is simple in process, no organic solvent needs to be introduced in the preparation process, and the preparation process is clean and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of porous materials, and in particular relates to a polylactic acid porous material containing fibrous holes and a preparation method thereof. Background technique [0002] Porous materials, with dual properties of function and structure, are a class of widely used engineering plastics with great application potential. Polylactic acid (PLA) is a polymer material with dual advantages in resources and environment. It not only has good biocompatibility and biodegradability, but also has good mechanical properties and processing properties. Therefore, it is widely used in the fields of biomedical and general plastics. , showing broad application prospects. Porous processing of polylactic acid to make it suitable for material science and biomedicine will further enhance the application value of polylactic acid. [0003] In the prior art, the preparation methods of porous materials mainly include solvent casting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J9/26
CPCC08J9/26C08J2201/0422C08J2367/04
Inventor 韩立晶赵玲张会良董丽松边俊甲杨慧丽潘宏伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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