A kind of hec/cnc/polyisocyanate shape memory airgel and its preparation method and application

A polypolyisocyanate and polyisocyanate technology, which is applied in the field of HEC/CNC/polypolyisocyanate shape memory aerogel and its preparation, can solve the problems of poor mechanical properties, low recovery, and few recycle times of aerogels. , to achieve the effect of many cycles, high recovery performance and low price

Active Publication Date: 2021-02-26
SHAANXI UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] Aiming at the technical problems existing in the above-mentioned prior art, the present invention provides a kind of HEC / CNC / polyisocyanate shape memory airgel and its preparation method and application, to solve the mechanical properties of the airgel prepared by HEC in the prior art Technical issues with poor, low recovery and few recyclable times

Method used

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  • A kind of hec/cnc/polyisocyanate shape memory airgel and its preparation method and application

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preparation example Construction

[0024] The present invention provides a kind of preparation method of HEC / CNC / polyisocyanate shape memory airgel, comprising the following steps:

[0025] Step 1, mixing polyisocyanate and nanocellulose microcrystalline solution, stirring to obtain a uniform milky white mixed solution; wherein, polypolyisocyanate and nanocellulose microcrystalline solution are in a mass ratio of (1-3): 100 ratio Mixing; the polyisocyanate adopts water-soluble blocked polyisocyanate; the mass percent of the nanocellulose microcrystal solution is 1%-3%; the nanocellulose microcrystal solution is mixed with water and stirred until uniform Light blue solution, prepared.

[0026] Step 2, mix the mixed solution with the hydroxyethyl cellulose solution, stir, and ultrasonically degas to obtain the HEC / CNC / polyisocyanate solution; the mass ratio of the mixed solution to the hydroxyethyl cellulose solution is 1:(10-20 ) ratio mixing; the mass percentage of hydroxyethyl cellulose in the hydroxyethyl ce...

Embodiment 1

[0029] A kind of preparation method of HEC / CNC / polyisocyanate shape memory airgel of the present invention comprises the following steps:

[0030] Step 1. Mix hydroxyethyl cellulose with deionized water, let it stand for swelling for 1 hour, and stir to prepare a 1% hydroxyethyl cellulose solution by mass;

[0031] Step 2, mixing nanocellulose microcrystals with deionized water, stirring until a uniform light blue solution is obtained, and preparing a nanocellulose microcrystal solution with a mass percentage of 1%;

[0032] Step 3, mixing polyisocyanate with the nanocellulose microcrystalline solution in step 2 in a mass ratio of 1:100, stirring until uniform milky white is present, to obtain a mixed solution;

[0033] Step 4. Mix the mixed solution in step 3 with the hydroxyethyl cellulose solution in step 1 in a mass ratio of 1:10, stir, and ultrasonically degas for 0.5 h to obtain HEC / CNC / polyisocyanate solution;

[0034] Step 5. Place the HEC / CNC / polyisocyanate solution ...

Embodiment 2

[0038] A kind of preparation method of HEC / CNC / polyisocyanate shape memory airgel of the present invention comprises the following steps:

[0039] Step 1. Mix hydroxyethyl cellulose and deionized water, let it stand for swelling for 3 hours, and stir to prepare a hydroxyethyl cellulose solution with a mass percentage of 1.5%.

[0040] Step 2, mixing the nanocellulose microcrystals with deionized water, stirring to a uniform light blue solution, and preparing a nanocellulose microcrystal solution with a mass percentage of 1.5%;

[0041] Step 3, mixing polyisocyanate with the nanocellulose microcrystalline solution in step 2 in a mass ratio of 1.5:100, stirring until uniform milky white is present, to obtain a mixed solution;

[0042] Step 4. Mix the mixed solution in step 3 with the hydroxyethyl cellulose solution in step 1 in a mass ratio of 1:15, stir, and ultrasonically degas for 0.7h to obtain HEC / CNC / polyisocyanate solution;

[0043]Step 5. Place the HEC / CNC / polypolyisocy...

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Abstract

The invention discloses a HEC / CNC / polyisocyanate shape memory airgel and a preparation method thereof. First, polyisocyanate and nano-cellulose microcrystalline solution are mixed and stirred to obtain a mixed solution; then the mixed solution is mixed with ethyl hydroxyethyl Base cellulose solution is mixed, stirred, and ultrasonically degassed to obtain HEC / CNC / polyisocyanate solution; finally, the HEC / CNC / polyisocyanate solution is frozen and dried to obtain HEC / CNC / polyisocyanate shape memory airgel. The hydroxyethyl cellulose and nano-cellulose microcrystals of the present invention are used as the basic skeleton, and polyisocyanate is introduced as a cross-linking agent; after freezing and drying with liquid nitrogen, a shape-memory airgel is formed; the airgel prepared by the present invention It is driven by water to return to the original shape, and can be used repeatedly, which is environmentally friendly and safe, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of cellulose airgel, in particular to a HEC / CNC / polyisocyanate shape memory airgel and its preparation method and application. Background technique [0002] In recent years, with the acceleration of urbanization and industrialization in my country, oil pollutants in water bodies and oil spills have caused great harm to human health and the ecological environment. Oil-polluted water sources have become an important environmental problem that needs to be solved urgently in the world. One, how to quickly and efficiently separate oil from water from oil-contaminated water sources has attracted widespread attention from governments and the public. [0003] The study of oil-water separation materials provides a new solution to the above problems. Traditional oil-water separation materials usually use non-biodegradable and non-renewable petroleum-based materials as the matrix. Certain hazards; cellulose derivative-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/80C08G18/64C08J9/28C08L75/04B01J13/00B01J20/26C02F1/28B01J20/30
CPCB01J13/0095B01J20/262C02F1/285C08G18/6484C08G18/80C08J9/28C08J2201/0484C08J2375/04
Inventor 陆赵情李娇阳黄吉振司联蒙姚成鲍晶晶
Owner SHAANXI UNIV OF SCI & TECH
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