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Flame-retardant elastic nanocellulose aerogel and preparation method thereof

A nanocellulose and aerogel technology, which is applied in the field of cellulose-based functional aerogel materials, can solve the problems of natural nanocellulose aerogels, such as flammability, low mechanical strength, and poor resilience, and improve application potential. And the effect of safety in use, simple preparation process, and increased durability

Active Publication Date: 2017-05-31
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the problems of the existing natural nano-cellulose airgel of flammability, low mechanical strength, easy deformation and poor resilience

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: A preparation method of flame-retardant elastic nano-cellulose airgel

[0028] Take 50 g of the prepared nanocellulose aqueous suspension, add an appropriate amount of ultrapure water and a small amount of organic solvent (the volume ratio of ultrapure water to organic solvent is 90~99:10~1), and stir at a speed of 1000r Stirring at 1 / min for 2 hours, and continuing ultrasonic dispersion for 2 hours, to obtain a nanofine cellulose suspension with a mass concentration of 0.50 to 1.50 wt%.

[0029] Take 0.50-1.50wt% nanofiber cellulose 50g, add 1-10wt% crosslinking agent (butane tetracarboxylic acid) and 10-30wt% flame retardant (N-methyloldimethyl Phosphate-based acrylamide), stirring at a stirring speed of 1000r / min for 1 to 2 hours, and continuing ultrasonic dispersion for 1 to 2 hours to obtain a uniformly mixed nanocellulose solution, standing at room temperature to remove air bubbles for later use;

[0030] Put the uniformly mixed nanocellulose solution ...

Embodiment 2

[0031] Example 2: A preparation method of flame-retardant elastic nano-cellulose airgel

[0032] Taking quantitative original nanofiber cellulose suspension, adding ultrapure water and a small amount of organic solvent to obtain nanofiber cellulose suspension with a mass concentration of 1.0-5.0wt%;

[0033] Take 100g of 1.0-5.0wt% nanofine cellulose, add 1-10wt% crosslinking agent (butane tetracarboxylic acid) and 20-50wt% flame retardant (2-carboxyethylphenyl Phosphonic acid, C 9 h 11 o 4 P), stirring at a stirring speed of 1000r / min for 1 to 2 hours, and continuing ultrasonic dispersion for 1 to 2 hours to obtain a uniformly mixed nanocellulose solution, standing at room temperature to remove air bubbles for later use;

[0034] Put the uniformly mixed nanocellulose solution into a circular copper tube or a square aluminum foil mold, and then place it in a liquid nitrogen bath (-197°C) to freeze for 1-10 minutes to solidify, and then place the frozen-formed sample in - F...

Embodiment 3

[0035] Example 3: A preparation method of flame-retardant elastic nano-cellulose airgel

[0036] Taking quantitative original nanofiber cellulose suspension, adding ultrapure water and a small amount of organic solvent to obtain nanofiber cellulose suspension with a mass concentration of 1.0-5.0wt%;

[0037] Take 100g of 1.0-5.0wt% nanofine cellulose, add 1-20wt% crosslinking agent (citric acid) and 20-50wt% flame retardant (N-hydroxymethyl dimethyl phosphoacrylic acid) to it in turn amide), stirred at a stirring speed of 1000r / min for 1-2h, and continued ultrasonic dispersion for 1-2h to obtain a uniformly mixed nanocellulose solution, which was left standing at room temperature to remove air bubbles for later use;

[0038] Put the uniformly mixed nanocellulose solution into a circular copper tube or a square aluminum foil mold, and then place it in a low-temperature refrigerator (-39°C) for freezing treatment for more than 24 hours to solidify, and then freeze the formed sam...

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Abstract

The invention discloses a flame-retardant elastic nanocellulose aerogel which is prepared from reactive organic compound and polybasic carboxylic acid-containing flame-retardant system by using biomass raw materials of the cellulose. The invention further discloses a preparation method of the aerogel. Compared with the traditional nanocellulose aerogel, the prepared aerogel has good flame-retardant performance, as well as excellent resilience performance, and the application potential and usage safety of the material in the fields of heat insulating field and the like can be greatly improved.

Description

technical field [0001] The invention relates to the field of cellulose-based functional airgel materials, in particular to a flame-retardant elastic nano-cellulose airgel and a preparation method thereof. Background technique [0002] Cellulose has a wide range of sources and is renewable. At present, researchers at home and abroad have developed large-scale dismantling of fibers in the range of medium and nanometer scales from the cell walls of different biomass materials (such as wood, bamboo, seaweed and other renewable resources). The green production method of the element. Due to the huge surface area and super strong water adsorption capacity of nanocellulose, a very small amount of nanocellulose can absorb a large amount of water to form a colloid, which has great advantages in the preparation of airgel materials. Nanocellulose aerogels not only have the characteristics of traditional airgel (low density, high porosity, etc.), but also incorporate their own excellent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08K5/092C08K5/521C08K5/5313C08J9/28C08J3/24
CPCC08J3/247C08J9/28C08J2201/0484C08J2301/02C08K5/092C08K5/521C08K5/5313C08L1/02
Inventor 陈志林郭丽敏吕少一黄景达傅峰
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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