A kind of polyvinyl alcohol/modified nanocellulose supramolecular hydrogel and its preparation method and application

A technology of supramolecular hydrogel and nanocellulose, which is applied in the field of polyvinyl alcohol/modified nanocellulose supramolecular hydrogel and its preparation, can solve the problem of limited improvement of controlled release performance, failure to meet the needs of use, and low thermal expansion. Coefficient and other issues, to achieve good three-dimensional space structure, excellent water retention and adsorption performance, good release performance

Active Publication Date: 2021-11-12
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the swelling performance of polyvinyl alcohol hydrogel is weak, and if it is used for soil improvement, the controlled release performance of soil conditioner or fertilizer can be improved limitedly. Nanocellulose has high strength, high modulus, low thermal expansion coefficient, high elongation Diameter ratio, low density, renewable, biodegradable, etc. At present, nanocellulose and polyvinyl alcohol are usually combined to prepare nanocellulose / polyvinyl alcohol hydrogel
Studies have shown that nanocellulose / polyvinyl alcohol hydrogel has improved swelling performance compared with polyvinyl alcohol hydrogel, but the degree of improvement is limited and still cannot meet the needs of use

Method used

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  • A kind of polyvinyl alcohol/modified nanocellulose supramolecular hydrogel and its preparation method and application
  • A kind of polyvinyl alcohol/modified nanocellulose supramolecular hydrogel and its preparation method and application
  • A kind of polyvinyl alcohol/modified nanocellulose supramolecular hydrogel and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of isocyanate-terminated 2-urea-4[H]-pyrimidinone:

[0038] Under nitrogen atmosphere, add 0.1mol 6-methylisocytosine and 1.5mol hexamethylene diisocyanate into 50ml of N,N-dimethylformamide, then react at 100°C for 16 hours, end the reaction, and lower the temperature to room temperature, the reactant was purified by n-pentane and placed in an oven for vacuum drying to obtain a white powder, which was the isocyanate-terminated 2-urea-4[H]-pyrimidinone, referred to as UPy-NCO;

[0039] 2. Preparation of polyvinyl alcohol / modified nanocellulose supramolecular hydrogel:

[0040] a) Add 20g of polyvinyl alcohol (abbreviation: PVA) into 100ml of water, stir at 100°C until completely dissolved, and prepare an aqueous solution of polyvinyl alcohol;

[0041] b) Add 1g of nanocellulose (abbreviation: CNC) and 6g of isocyanate-terminated 2-urea-4[H]-pyrimidinone to 50ml of rectification-grade DMF, add 0.1mL of dibutyltin dilaurate, at 100°C After reacting for 18 h...

Embodiment 2

[0050] 1. Preparation of isocyanate-terminated 2-urea-4[H]-pyrimidinone:

[0051] Under nitrogen atmosphere, add 0.1mol 6-methylisocytosine and 0.6mol hexamethylene diisocyanate into 50ml of N,N-dimethylformamide, then react at 110°C for 14 hours, end the reaction, and lower the temperature to room temperature, the reactant was purified by n-pentane and placed in an oven for vacuum drying to obtain a white powder, which was the isocyanate-terminated 2-urea-4[H]-pyrimidinone, referred to as UPy-NCO;

[0052] 2. Preparation of polyvinyl alcohol / modified nanocellulose supramolecular hydrogel:

[0053] a) Add 25g of polyvinyl alcohol into 100ml of water, stir at 100°C until completely dissolved, and prepare an aqueous solution of polyvinyl alcohol;

[0054] b) Add 2g of nanocellulose and 4g of isocyanate-terminated 2-urea-4[H]-pyrimidinone into 50ml of rectification-grade DMF, add 0.1ml of dibutyltin dilaurate, react at 110°C for 16 hours, and end reaction, the reactants were wa...

Embodiment 3

[0063] 1. Preparation of isocyanate-terminated 2-urea-4[H]-pyrimidinone:

[0064] Under a nitrogen atmosphere, add 1 mol of 6-methylisocytosine and 1.5 mol of hexamethylene diisocyanate into 50 ml of N,N-dimethylformamide, then react at 120°C for 12 hours, complete the reaction, and lower the temperature to At room temperature, the reactant was purified by n-pentane and dried in an oven under vacuum to obtain a white powder, which was the isocyanate-terminated 2-urea-4[H]-pyrimidinone, referred to as UPy-NCO;

[0065] 2. Preparation of polyvinyl alcohol / modified nanocellulose supramolecular hydrogel:

[0066] a) Add 30g of polyvinyl alcohol into 100ml of water, stir at 100°C until completely dissolved, and prepare an aqueous solution of polyvinyl alcohol;

[0067] b) Add 3g of nanocellulose and 3g of isocyanate-terminated 2-urea-4[H]-pyrimidinone into 50ml of rectification-grade DMF, add 0.1ml of dibutyltin dilaurate, and react at 120°C for 14 hours to end reaction, the reac...

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PUM

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Abstract

The invention discloses a polyvinyl alcohol / modified nanocellulose supramolecular hydrogel and its preparation method and application. The polyvinyl alcohol / modified nanocellulose supramolecular hydrogel is prepared in boric acid or boric acid In the presence of salt, it is obtained by reacting modified nano-cellulose with polyvinyl alcohol in water, and the modified nano-cellulose is obtained by modifying nano-cellulose with isocyanate-terminated ureidopyrimidinone. The polyvinyl alcohol / modified nanocellulose supramolecular hydrogel prepared by the present invention has excellent hydrophilicity, water absorption, swelling, water retention, controlled release, and stimuli responsiveness, and can be used as a soil conditioner. It can be used as a controlled / slow release material to prepare a control / slow release material type soil conditioner or fertilizer, and has good industrial application prospects in the field of soil improvement and restoration.

Description

technical field [0001] The invention relates to a supramolecular hydrogel and its preparation method and application, in particular to a polyvinyl alcohol / modified nanocellulose supramolecular hydrogel and its preparation method and application. Background technique [0002] Due to air pollution, excessive fertilization, heavy use and light cultivation, the pollution of cultivated land has increased, soil acidification has hardened, and soil activity has decreased. Soil conditioning is urgent, and cultivated land restoration is imminent. At present, the soil is mainly regulated by soil conditioners. The traditional soil conditioners are mainly solid soil conditioners such as lime, superphosphate, calcium magnesium phosphate fertilizer, etc., which have a single function. Although they can adjust the pH of the soil, they will also form difficult Dissolved calcium sulfate, calcium phosphate, calcium and other by-products, these by-products not only cannot be absorbed and utili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L29/04C08L1/08C08K3/38C08B15/06
CPCC08B15/06C08J3/075C08J2329/04C08J2401/08C08K3/38C08K2003/387
Inventor 王锦成丁瑶珂宋仕强饶品华陈思浩王润锴吴有志杨帆李亚坤
Owner SHANGHAI UNIV OF ENG SCI
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