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HEC/CNC/polyisocyanate shape memory aerogel, and preparation method and application thereof

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

Active Publication Date: 2019-09-13
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • HEC/CNC/polyisocyanate shape memory aerogel, and preparation method and application thereof

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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 0.7 hours to obtain HEC / CNC / polyisocyanate solution;

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

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Abstract

The invention discloses an HEC / CNC / polyisocyanate shape memory aerogel and a preparation method thereof. The method comprises the following steps: polyisocyanate and a nano-cellulose microcrystal solution are mixed and stirred to obtain a mixed solution; the mixed solution and a hydroxyethyl cellulose solution are mixed, stirred and ultrasonically degassed to obtain an HEC / CNC / polyisocyanate solution; and the HEC / CNC / polyisocyanate solution is frozen and dried to obtain the HEC / CNC / polyisocyanate shape memory aerogel. The hydroxyethyl cellulose and the nano-cellulose microcrystal of the invention are used as the basic skeleton, and the polyisocyanate is introduced as a crosslinking agent; the shape memory type aerogel is formed after liquid nitrogen freezing and drying; and the aerogel prepared in the invention restores to the original shape under the driving of water, can be recycled many times, is environmentally friendly and safe, and has a low cost.

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 Applications(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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