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Water-soluble aldehyde starch-polyethyleneimine coating modified polymer film and preparation method thereof

A polyethyleneimine, polymer membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. and other problems, to achieve the effect of wide source of raw materials, excellent hydrophilicity and anti-pollution performance, and low cost

Pending Publication Date: 2022-04-12
佛山市南海区苏科大环境研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems in the existing coating technology: first, coating component diluents are often used in the coating process, and these diluents are basically organic solvents, and organic solvents are not only easy to volatilize into the air and cause Environmental pollution is harmful to human health, and will dissolve the polymer film substrate material to destroy the polymer film body structure; second, the coating components are coated on the surface of the polymer film by simple coating method and adsorbed on the surface of the polymer film through secondary physical interaction. On the surface of the polymer film, the molecules of individual coating components are not connected by chemical bonds, so they are easily detached from the surface of the film
Since the coating components can use water as a solvent, the pollution to the environment is minimized (CN202011397479.9), but P(GMA-co-mPEGMA) needs to be prepared by atom transfer radical method, and still uses organic Solvents are not conducive to large-scale production and cannot control the green and environmental characteristics of the overall process from the source

Method used

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  • Water-soluble aldehyde starch-polyethyleneimine coating modified polymer film and preparation method thereof
  • Water-soluble aldehyde starch-polyethyleneimine coating modified polymer film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 10.65g of soluble starch powder in a 250mL round bottom flask, add 200ml of 35°C deionized water, place the round bottom flask in a 35°C water bath, and after the starch is completely dissolved under magnetic stirring, add 3.71g of periodic acid Sodium, the round bottom flask was wrapped with tinfoil to avoid light, and continued to stir for 2 hours; then add 400mL acetone, filter with suction, dissolve the filter cake in deionized water and then precipitate with acetone, repeat the precipitation washing twice, and finally filter the obtained filter cake with suction Vacuum drying at room temperature to obtain water-soluble aldehyde starch.

Embodiment 2

[0029] A method for water-soluble aldehyde-based starch-polyethyleneimine coating modified polyvinylidene fluoride film (PVDF), it may further comprise the steps:

[0030] Step 1, adopt the preparation method of embodiment 1 to prepare water-soluble aldehyde-based starch;

[0031] Step 2, the water-soluble aldehyde-based starch and polyethyleneimine (weight average molecular weight is 25000g / mol) are respectively dissolved in deionized water, and respectively prepared into water-soluble aldehyde-based starches with a mass percentage concentration of 1% (wt%) Water-soluble starch and 6% (wt %) polyethyleneimine aqueous solution;

[0032] (3) Alternately spray the water-soluble aldehyde-based starch aqueous solution and polyethyleneimine aqueous solution on the PVDF film using a sprayer (or a spray gun or various atomizers under air, air-free or other conditions, manually or automatically) Surface, each sprayed 3 times; the modified PVDF film after spraying was heat-treated in ...

Embodiment 3

[0034] A method for water-soluble aldehyde starch-polyethyleneimine coating modified polyacrylonitrile, it may further comprise the steps:

[0035] Step 1, adopt the preparation method of embodiment 1 to prepare water-soluble aldehyde-based starch;

[0036] Step 2, the water-soluble aldehyde-based starch and polyethyleneimine (weight-average molecular weight: 10000g / mol) are respectively dissolved in deionized water, and respectively prepared into water-soluble aldehyde-based starches with a mass percentage concentration of 1.5% (wt%) Starch aqueous solution and 5% (wt %) polyethyleneimine aqueous solution;

[0037] Step 3. Spray the water-soluble aldehyde-based starch aqueous solution and the polyethyleneimine aqueous solution on the polypropylene alternately with a sprayer (or a spray gun or various atomizers under air, airless or other conditions, manually or automatically). The surface of the nitrile film was sprayed twice each time; the modified polyacrylonitrile film af...

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Abstract

The invention provides a preparation method of a water-soluble aldehyde starch-polyethyleneimine coating modified polymer film. The preparation method comprises the following steps: step 1, preparing water-soluble aldehyde starch from soluble starch; 2, respectively preparing a water-soluble aldehyde starch aqueous solution and a polyethyleneimine aqueous solution; and 3, alternately spraying the water-soluble aldehyde starch aqueous solution and the polyethyleneimine aqueous solution on the surface of the polymer membrane, heating the sprayed polymer membrane in a drying oven, taking out the polymer membrane, and cleaning the membrane with deionized water to obtain the multifunctional modified polymer membrane. The invention further provides a water-soluble aldehyde starch-polyethyleneimine coating modified polymer film. The preparation method of the polymer film is simple, no organic solvent is adopted in the preparation process, and the polymer film has the characteristic of environmental protection.

Description

technical field [0001] The invention belongs to the fields of energy saving, environmental protection and new materials, and in particular relates to a method for modifying a polymer film with a water-soluble aldehyde starch-polyethyleneimine coating. Background technique [0002] Surface coating technology is a very practical method to improve the surface hydrophilicity of membrane materials. Through coating technology, hydrophilic groups can be fixed on the surface of commercial polymer membranes, which can significantly improve the anti-pollution performance of polymer membranes, even Various properties, such as heavy metal adsorption, dye adsorption, or antibacterial, can be endowed to the polymer film through the introduced functional groups. [0003] Using the existing coating technology, it is easy to coat various coating components from small molecules to polymer macromolecules on the membrane surface by direct spraying, dipping, spin coating and other methods. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02
Inventor 张干伟纪海兰刘大朋沈舒苏周晓吉顾梦琪陈思凡王诗怡
Owner 佛山市南海区苏科大环境研究院