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Method for preparing biodegradable hydrophobic membrane from prolamin and fatty acid

A gliadin, biodegradable technology, applied in the field of biodegradable hydrophobic membranes, can solve the problems of unavailability, limitation, and strong water absorption capacity of membrane materials

Active Publication Date: 2021-06-04
江苏彩康隐形眼镜有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] This application solves the problem that the renewable natural resource polymers in the prior art contain a large number of hydroxyl groups, high crystallinity, and strong water absorption capacity, which limits its ability to replace petroleum-based materials In the application and prior art, the mixture of fatty acid and zein is used to process the film material into a phase separation, which leads to technical problems such as the unusability of the film material; the purpose is to solve the material problem caused by the poor compatibility of fatty acid and zein Phase separation occurs during processing and preparation, while the material is hydrophobic and biodegradable; a method for preparing a biodegradable hydrophobic film from prolamin and fatty acids is provided, and the fatty acid and zein can be improved without precipitation and kneading. Compatibility of protein mixtures; this method involves the addition of a base to overcome compatibility barriers and then polymerizes fatty acid unsaturation and plasticizes prolamins, which increases mechanical strength and imparts flexibility and excellent water resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a biodegradable hydrophobic film from prolamin and fatty acid, comprising:

[0038] The first step: dissolving zein in an aqueous solution of isopropanol to prepare a zein solution, the aqueous solution of isopropanol is an aqueous solution of 80% isopropanol by weight, and the protein is in an aqueous solution of isopropanol The concentration is 36.6%;

[0039] Step 2: Mix and stir the zein solution at 60-70°C for 10 minutes at a mixing speed of 2150rpm;

[0040] Step 3: Add linoleic acid to the mixed and stirred zein solution, the mass ratio of linoleic acid to zein is 0.5:1, continue to stir at 60-70°C for 2 minutes, stir Speed ​​is 2150rpm, then add ammonium hydroxide, the addition of described ammonium hydroxide is 3% of linoleic acid weight;

[0041] Step 4: After mixing for 30 minutes, add cobalt derivative desiccant, the amount of cobalt derivative desiccant is 0.1% of the weight of linoleic acid, and continue to stir for 5 minutes;

[...

Embodiment 2

[0044] A method for preparing a biodegradable hydrophobic film from prolamin and fatty acid, comprising:

[0045] The first step: dissolving zein in an aqueous solution of isopropanol to prepare a zein solution, the aqueous solution of isopropanol is an aqueous solution of 80% isopropanol by weight, and the protein is in an aqueous solution of isopropanol The concentration is 36.6%;

[0046] Step 2: Mix and stir the zein solution at 60-70°C for 10 minutes at a mixing speed of 2150rpm;

[0047] The third step: add linoleic acid to the mixed and stirred zein solution, the mass ratio of linoleic acid to zein is 1:1, continue to stir at 60-70°C for 2 minutes, stir Speed ​​is 2150rpm, then add ammonium hydroxide, the addition of described ammonium hydroxide is 4% of linoleic acid weight;

[0048] Step 4: After mixing for 35 minutes, add cobalt derivative desiccant, the amount of cobalt derivative desiccant is 0.1% of the weight of linoleic acid, and continue to stir for 5 minutes...

Embodiment 3

[0051] As in Example 2, but without the addition of alkaline chemicals to the mixture, differential scanning calorimetry showed two glass transition temperatures, namely -17°C for linoleic acid, and 154°C for zein The glass transition temperature of the mixture film in Example 3 only shows a glass transition temperature of 113 ° C.

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PUM

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Abstract

The invention relates to a method for preparing a biodegradable hydrophobic membrane from prolamin and fatty acid. The method comprises the following steps: dissolving protein in an aqueous solution of isopropanol to prepare a prolamin solution; mixing and stirring the prolamin solution at 60-70 DEG C, then adding fatty acid, and continuously stirring; then adding alkali chemicals, and uniformly mixing the mixture; adding a metal curing drying agent, and continuously stirring the mixture; and coating a steel plate with the stirred mixture to form a membrane, and drying the membrane at high temperature to form the required membrane. According to the invention, common phase separation in preparation of a membrane material from prolamin and fatty acid is solved by adding alkali chemicals, so that the uniform and transparent biodegradable hydrophobic membrane is prepared.

Description

technical field [0001] The invention relates to the field of biodegradable hydrophobic membranes, in particular to a method for preparing biodegradable hydrophobic membranes from gliadin and fatty acids. Background technique [0002] Membrane materials are widely used in many fields such as food and drug packaging, fresh-keeping of fruits and vegetables, and membrane separation. Among them, most of the most widely used membrane materials are petroleum-based plastics (such as olefins), which have unique and excellent comprehensive properties, and the output of products is large. , with a high degree of industrialization and a relatively complete industrial chain. However, the degradation process of these membrane materials is very slow, and it takes about 100-200 years or even longer to be decomposed, which brings great harm to the ecological environment. At the same time, oil prices rose rapidly due to the high degree of industrialization. These have led to a sudden increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L89/00C08K5/09
CPCC08J5/18C08J2389/00C08K5/09Y02W90/10
Inventor 陈永军
Owner 江苏彩康隐形眼镜有限公司