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Environmental-friendly cellulose-based flame-retardant thermal insulation material and preparation method thereof

A cellulose-based, heat-insulating material technology is applied in the field of cellulose-based flame-retardant and heat-insulating materials, environment-friendly cellulose-based flame-retardant heat-insulating materials and their preparation fields, and can solve the problems of restricting cellulose materials, complicated preparation process and easy generation. Smoke and other problems, to achieve the effect of reducing the amount of smoke released, the process flow is short, and the processing process flow is short

Active Publication Date: 2018-10-09
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, flammability, the fatal shortcoming of cellulose materials, limits the further application of cellulose materials in the fields of thermal insulation, environmentally friendly flame-retardant panels, etc., and the current technology of cellulose material flame retardants has poor environmental protection and is easy to burn when burned. Generate dense smoke, toxic gas and other problems, flame retardant and reduce material strength at the same time, the preparation process is complicated, so it is urgent to use environmentally friendly flame retardant for cellulose materials

Method used

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  • Environmental-friendly cellulose-based flame-retardant thermal insulation material and preparation method thereof
  • Environmental-friendly cellulose-based flame-retardant thermal insulation material and preparation method thereof
  • Environmental-friendly cellulose-based flame-retardant thermal insulation material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of an environmentally friendly cellulose-based flame-retardant heat-insulating material, such as figure 1 As shown, the specific steps are as follows:

[0035] (1). Take several portions of thick cotton pulp containing 3g of cotton, and weigh 0.6g of Mg / Al(OH)-LDHs, Mg / Al(CO 3 )-LDHs, Mg / Al(PO 4 )-LDHs, Mg / Al(HPO 4 )-LDHs, Mg / Al(H 2 PO 4 )-LDHs, Mg / Al(NO 3 )-LDHs, Mg / Al(B 4 o 7 )-LDHs and put into cotton pulp, then gradually add NaOH 7g and water, after NaOH dissolves and the solution is cooled, add urea 12g, finally control the NaOH concentration to be 7wt%, the urea concentration to be 12wt%, and the cellulose mass to be 3wt% , the total mass of the mixture was 100.6 g, stirred and dissolved, and then frozen at -20°C for 2 hours.

[0036] (2). Take out the frozen mixture in step (1) and stir it with 200r / min until the cotton fiber is completely dissolved and the layered double metal hydroxide is evenly dispersed to obtain the LDHs / cellulos...

Embodiment 2

[0044] A preparation method of an environmentally friendly cellulose-based flame-retardant heat-insulating material, the specific steps are as follows:

[0045] (1). Take five parts of 4g and obtain broken cotton after waste cotton fabric treatment, weigh 0.4g, 1.6g, 4.0gMg / Al(CO 3 )-LDHs, after mixing the components, add 96g of alkaline urine solution to make each component completely wet, and then freeze at -20°C for 1.5h. The alkaline urine solution contains 7 wt% of NaOH, 12 wt% of urea and 81 wt% of water.

[0046] (2). Take out the frozen mixture in step (1) and add high-speed stirring until the chopped cotton fibers are completely dissolved and the layered double metal hydroxide is evenly dispersed to obtain a mixed solution of LDHs / cellulose.

[0047] (3). Add 1.2g of N,N-methylenebisacrylamide to several groups of solutions obtained in step (2), stir at high speed for 30 minutes, then ultrasonically disperse for 5 minutes, then continue stirring at high speed for 30 ...

Embodiment 3

[0055] A preparation method of an environmentally friendly cellulose-based flame-retardant heat-insulating material, the specific steps are as follows:

[0056] (1). Take several pieces of cotton containing about 7g of cellulose, 93g of alkali urine solution and layered double metal hydroxide, stir to make each component soak and freeze at -20°C for 3 hours, and the layered bimetal The hydroxide content is respectively:

[0057] A:0g

[0058] B:Ca / Al(CO 3 )-LDHs 1.2g

[0059] C:Mg / Al(CO 3 )-LDHs 1.2g

[0060] D:Mg / Al(H 2 PO 4 )-LDHs 1.2g

[0061] E:Ca / Al(CO 3 )-LDHs 0.6g, Mg / Al(CO 3 )-LDHs 0.6g

[0062] F:Mg / Al(H 2 PO 4 )-LDHs 0.6g, Mg / Al(CO 3 )-LDHs 0.6g

[0063] G:Ca / Al(CO 3 )-LDHs 0.6g, Mg / Al(H 2 PO 4 )-LDHs 0.6g; the alkaline urine solution contains 7wt% NaOH, 12wt% urea and 81wt% water.

[0064] (2). Take out the frozen mixture in step (1) and add high-speed stirring until the chopped cotton fibers are completely dissolved and the layered double metal hy...

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Abstract

The invention relates to cellulose-based flame-retardant thermal insulation materials, in particular to an environmental-friendly cellulose-based flame-retardant thermal insulation material and a preparation method thereof, and belongs to the technical field of novel materials. The environmental-friendly cellulose-based flame-retardant thermal insulation material is prepared by the following steps: taking cellulose and layered double hydroxides as raw materials, and dissolving the cellulose by adopting a direct blending method under the alkaline condition at a low temperature of 20-30 DEG C below zero; fully stirring at a room temperature to form layered double hydroxides, uniformly dispersing agglomeration-free cellulose solution, crosslinking the obtained solution through a crosslinkingagent, and performing freeze drying, so as to obtain the environmental-friendly cellulose-based flame-retardant thermal insulation material having a mineralized porous structure. The material has excellent heat preservation and thermal insulation properties and has low probability of shrinkage after being heated; the layered double hydroxides are uniformly distributed in the porous structure of the material, the flame-retardant property of the material is effectively improved, and the heat release rate and smoke release amount of the material are reduced; the processing technology is short inprocess and pollution-free.

Description

technical field [0001] The invention relates to a cellulose-based flame-retardant and heat-insulating material, in particular to an environment-friendly cellulose-based flame-retardant and heat-insulating material and a preparation method thereof, belonging to the technical field of new materials. Background technique [0002] Cellulose has excellent performance, wide range of sources, green and environmental protection, and wide range of uses, and it can be found everywhere in human life. However, flammability, the fatal shortcoming of cellulose materials, limits the further application of cellulose materials in the fields of thermal insulation, environmentally friendly flame-retardant panels, etc., and the current technology of cellulose material flame retardants has poor environmental protection and is easy to burn when burned. Generate dense smoke, toxic gas and other problems, flame retardancy reduces material strength at the same time, and the preparation process is co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08K3/22C08K3/26C08K3/32C08K3/28C08K3/38C08J3/075
CPCC08J3/075C08K3/28C08K2003/267C08K2003/2227C08K2003/327C08K2003/387C08J2301/02
Inventor 刘琳骆晓蕾李震姚菊明
Owner ZHEJIANG SCI-TECH UNIV
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