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A kind of preparation method of polylactic acid fiber composite surface porous membrane material

A polylactic acid fiber and composite surface technology, which is applied to carbon fiber, natural fiber, fiber treatment, etc., can solve the problems of slow degradation of protease degradation solution, unstable biological enzyme activity, and unstable preparation effect, achieving short time consumption, Strong stability and large specific surface area

Active Publication Date: 2021-03-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the activity of the biological enzyme is unstable, it is easily affected by various external factors, and it has biological activity within a specific time, so it is necessary to replace the protease regularly during the preparation process, the preparation effect is unstable, and the operation is cumbersome; at the same time, the protease degradation solution The degradation rate is relatively slow and takes a long time

Method used

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  • A kind of preparation method of polylactic acid fiber composite surface porous membrane material
  • A kind of preparation method of polylactic acid fiber composite surface porous membrane material
  • A kind of preparation method of polylactic acid fiber composite surface porous membrane material

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Effect test

Embodiment 1

[0027] 1) Weigh 5g of polylactic acid (PLA) with a number average molecular weight of 200,000 Daltons, stir and dissolve in 150mL of dichloromethane, and obtain a polylactic acid solution with a concentration of 2.5wt% at room temperature;

[0028] 2) Dip the carbon nanofiber (NCF) into the polylactic acid solution with a concentration of 2.5wt% in step 1), take it out after dipping for 50 seconds, and place it in a fume hood to dry naturally.

[0029] figure 1 It is a schematic diagram of the dip coating method of polylactic acid fiber composite surface porous membrane material, figure 2 SEM image of a typical polylactic acid porous membrane on the NCF surface of the polylactic acid fiber composite surface porous membrane material. From the SEM image, it can be seen that there are many polylactic acid membranes with nearly circular pores, and these pores are evenly distributed. Most of the pores are 1-31 μm in diameter and appear to be isolated from each other, usually at ...

Embodiment 2

[0033] 1) Weigh 5g of polylactic acid (PLA) with a number average molecular weight of 250,000 Daltons, dissolve it in 125mL of dichloromethane under stirring, and obtain a polylactic acid solution with a concentration gradient of 3.0wt% at room temperature;

[0034] 2) Dip the carbon nanofiber (NCF) into the polylactic acid solution with a concentration of 3.0wt% in step 1), take it out after 60 seconds, and place it in a fume hood to dry naturally.

[0035] image 3 It is the SEM image of different pores in the polylactic acid fiber composite surface porous membrane material. As shown in the figure, there are other different pore arrangements on the surface of the NFC fiber, showing different pore morphology types: A is non-circular and deformed Pores; B are shallow pores indicating that they only contain polymer and air and the NCF fibers below the polymer pores cannot be seen; C is a "complete" porous structure, which means that the fibers below the polymer pores are still ...

Embodiment 3

[0037] 1) Weigh 5g of polylactic acid (PLA) with a number average molecular weight of 250,000 Daltons, dissolve it in 100mL of dichloromethane under stirring, and obtain a polylactic acid solution with a concentration gradient of 3.5wt% at room temperature;

[0038] 2) Dip the carbon nanofiber (NCF) into the polylactic acid solution with a concentration of 3.5wt% in step 1), take it out after 60 seconds, and place it in a fume hood to dry naturally.

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Abstract

The invention belongs to the field of high polymer material sciences, and concretely relates to a preparation method of apolylactic acid fiber composite surface porous film material. The preparation method provided by the invention comprises the steps of dip-coating a fiber into a polylactic acid solution, and air-drying, wherein the mass percent concentration of polylactic acid in the polylacticacid solution is 1 weight percent to 5 weight percent, and the dip-coating time is 50s to 80s. The method provided by the invention is simple and economical in process, convenient and fast to operate,and short in consumed time; the obtained polylactic acid fiber composite surface porous film is a highly ordered and porous material with high stability and large specific surface area, is green without pollution, can be widely applied to the biological medicinessuch as industrial catalysis, biological medicines, fuel cellproton exchange membranes, and high-endisolation techniques as well as thetechnologies such as fuel cellproton exchange membranes, and high-endisolation techniques.

Description

technical field [0001] The invention belongs to the field of polymer material science, and in particular relates to a preparation method of polylactic acid fiber composite surface porous membrane material. Background technique [0002] Porous material refers to a solid with a certain number of holes. Its typical structure is mainly a two-dimensional structure composed of a large number of polygonal holes gathered on a plane. The shape is similar to the hexagonal structure of a honeycomb and is called "honeycomb". A three-dimensional structure formed by the accumulation of polyhedral-shaped pores in space, commonly referred to as a "foam" material. Due to its special porous structure, porous materials have many excellent physical and chemical properties such as high specific surface area, high permeability, and assembleability, and can be widely used in the fields of chemical industry, biomedicine, environmental protection, and functional materials. [0003] According to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/507D06M101/40D06M101/02
CPCD06M15/507D06M2101/02D06M2101/40
Inventor 岳航勃郭建维郑萍璇杨楚芬
Owner GUANGDONG UNIV OF TECH
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