Method for preparing enhanced and toughened L-polylactide composite membrane based on wool keratin cortex cell

A technology of L-polylactic acid and wool keratin, which is applied in the field of polymer material preparation, can solve problems such as the difficulty of using L-lactic acid film to toughen, and achieve the effects of strong directional degradation, efficient separation, and improved brittleness

Active Publication Date: 2019-01-18
北京朗净汇明生物科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wool fiber diameter is as high as 20 μm, which is difficult to be used for the toughening of L-PLA film

Method used

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  • Method for preparing enhanced and toughened L-polylactide composite membrane based on wool keratin cortex cell
  • Method for preparing enhanced and toughened L-polylactide composite membrane based on wool keratin cortex cell
  • Method for preparing enhanced and toughened L-polylactide composite membrane based on wool keratin cortex cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: a kind of preparation method of wool keratin cortex cell, the steps are as follows:

[0057] Step 1. Use calcium hypochlorite / hydrogen peroxide to remove the wool surface scale layer:

[0058] (1) Soak the waste rough wool in water at 25°C, the solid-to-liquid ratio is 1:25, soak the wool thoroughly, and add calcium hypochlorite Ca(ClO) with an active chlorine content of 70% 2 ·3H 2 O, standing for 5 minutes to obtain system A; wherein the amount of calcium hypochlorite added is 5% of the wool quality.

[0059] (2) slowly adding mass fraction in system A is 30% hydrogen peroxide, sodium pyrophosphate as peroxide stabilizer, ethylenediaminetetraacetic acid as peroxide chelating agent to form system B; Treat under constant temperature conditions for 20 minutes to make the wool react with hypochlorite and peroxide; wherein, based on the volume of the solution in system A, the amount of hydrogen peroxide with a mass fraction of 30% is 14ml / L, and the coke T...

Embodiment 2

[0069] Embodiment 2: a kind of preparation method of wool keratin cortex cell, the steps are as follows:

[0070] Step 1. Use calcium hypochlorite / hydrogen peroxide to remove the wool surface scale layer:

[0071] (1) Soak the waste fine wool in water at 20°C, the solid-to-liquid ratio is 1:20, soak the wool thoroughly, and add calcium hypochlorite Ca(ClO) with an active chlorine content of 70% 2 ·3H 2 O, stand still for 5 minutes to obtain system A; wherein the added amount of calcium hypochlorite is 3% of the wool quality.

[0072] (2) Slowly add hydrogen peroxide, sodium pyrophosphate as a peroxide stabilizer, and ethylenediaminetetraacetic acid as a peroxide chelating agent in system A to form system B; Treat under constant temperature conditions for 20 minutes to make wool react with hypochlorite and peroxide; wherein, based on the volume of the solution in system A, the mass fraction of 30% hydrogen peroxide is added in an amount of 10ml / L, The added amount of sodium ...

Embodiment 3

[0093] Embodiment 3: A method for preparing porous materials based on wool keratin cortex cells, the specific steps are as follows:

[0094] Step 1, using wool keratin cortex cells as raw materials, preparing an aqueous suspension of cortex cells with a mass percentage of 5%;

[0095] Step 2: Add glutaraldehyde to the aqueous suspension of cortical cells, the quality of glutaraldehyde in the mixed solution is respectively 0.15%, 0.8% and 1.5% of the mass of wool keratin cortical cells, and magnetically stir for 10 minutes to obtain three homogeneous milky white suspension;

[0096] Step 3. Quickly freeze the milky white suspension at -40°C for 10 hours, and then vacuum freeze-dry for 36 hours;

[0097] Step 4: Put the vacuum freeze-dried sample in an oven at 180° C. for 2 hours, and cross-link keratin with glutaraldehyde to obtain three kinds of porous materials of wool cortex cells.

[0098] Carry out following analysis for the experimental result of embodiment 3:

[0099]...

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Abstract

The invention provides a method for preparing an enhanced and toughened L-polylactide composite membrane based on wool keratin cortex cells and belongs to the field of high polymer materials. The method comprises the following steps: firstly, dissolving polylactic acid into trichloromethane; secondly, mixing L-polylactide with wool keratin cortex cells, and putting into the polylactic acid solution; uniformly stirring the mixed solution at a normal temperature; finally, pouring the mixed solution into a film former, leaving to stand for 1-2 days at a vent hole at the room temperature, and filming naturally, thereby obtaining the cortex cell enhanced and toughened L-polylactide composite membrane. By adopting the simple method, the enhanced and toughened polylactic acid composite membrane is prepared and can be applied to fields such as packaging.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, and in particular relates to a method for preparing a reinforced and toughened L-polylactic acid composite film based on wool keratin cortex cells. Background technique [0002] With the continuous development of society, people's demand for environmentally friendly materials is increasing. In recent years, renewable and degradable natural polymer materials have received extensive attention. Waste wool keratin is a typical type of highly cross-linked protein, which has the advantages of good water resistance and stability, small thermal conductivity (good heat insulation performance), sound insulation, non-combustibility, and good elasticity. About 1 million tons of waste wool keratin is produced in my country every year, most of which are landfilled and not fully utilized. Waste wool keratin has the following main sources: (1) wool textile consumption field; (2) wool textile process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L67/04C08L89/00C12N5/071
CPCC08J5/18C08J2367/04C08J2489/00C12N5/0625C12N2509/00
Inventor 侯秀良魏世锦黄晓华朱小颖马博谋
Owner 北京朗净汇明生物科技有限公司
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