ZIFs nanosheet/chitosan/diatomite hybrid and preparation method thereof

A technology of diatomite and chitosan, applied in the field of flame retardants, can solve the problem of low flame retardant efficiency of diatomite

Active Publication Date: 2019-11-26
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some researchers have applied diatomaceous earth to flame-retardant polymers, and their research has found that the disk-like structure of diatomite can act as a physical barrier to a certain extent, thereby improving the flame retardancy of polymers; however, using silicon alone The flame retardant efficiency is not high when using algae

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Preparation of Flame Retardant and Smoke Suppressant

[0018] a) preparation concentration is the chitosan aqueous solution of 0.010kg / L and the zinc nitrate hexahydrate aqueous solution that concentration is 0.009kg / L respectively, the solvent is deionized water, the two kinds of solutions are mixed and ultrasonically dispersed, and the mixed solution is moved into In the flask, mechanically stirred and reacted for 2 hours, 2-methylimidazole was dissolved in deionized water to prepare an aqueous solution with a concentration of 0.024kg / L, and dropped into the above-mentioned flask, reacted for 2 hours, centrifugally washed and dried to obtain the intermediate product ZC, wherein The volume ratio of chitosan, zinc nitrate hexahydrate, and 2-methylimidazole solution is 2:3:3;

[0019] b) Prepare the dispersion of the above-mentioned intermediate product ZC with a concentration of 0.010kg / L, take diatomaceous earth to prepare a dispersion with a concentration of 0.013k...

Embodiment 2

[0026] 1. Preparation of Flame Retardant and Smoke Suppressant

[0027] a) preparation concentration is the chitosan aqueous solution of 0.010kg / L and the cobalt nitrate hexahydrate aqueous solution that concentration is 0.020kg / L respectively, solvent is deionized water, two kinds of solutions are mixed and ultrasonically dispersed, mixed solution is moved into In the flask, mechanically stirred and reacted for 2 hours, 2-methylimidazole was dissolved in deionized water to prepare an aqueous solution with a concentration of 0.024kg / L, and was dropped into the above-mentioned flask, reacted for 4 hours, centrifugally washed and dried to obtain the intermediate product ZC, wherein The volume ratio of chitosan, zinc nitrate hexahydrate, and 2-methylimidazole solution is 2:3:3;

[0028] b) Prepare the dispersion of the above-mentioned intermediate product ZC with a concentration of 0.010kg / L, take diatomaceous earth to prepare a dispersion with a concentration of 0.010kg / L, mix t...

Embodiment 3

[0035] 1. Preparation of Flame Retardant and Smoke Suppressant

[0036] a) preparation concentration is the chitosan aqueous solution of 0.010kg / L and the cobalt nitrate hexahydrate aqueous solution that concentration is 0.020kg / L respectively, solvent is deionized water, two kinds of solutions are mixed and ultrasonically dispersed, mixed solution is moved into In the flask, mechanically stirred and reacted for 2 hours, 2-methylimidazole was dissolved in deionized water to prepare an aqueous solution with a concentration of 0.024kg / L, and dropped into the above-mentioned flask, reacted for 3 hours, centrifugally washed and dried to obtain the intermediate product ZC, wherein The volume ratio of chitosan, zinc nitrate hexahydrate, and 2-methylimidazole solution is 2:3:3;

[0037] b) Prepare the dispersion liquid of the above-mentioned intermediate product ZC with a concentration of 0.010kg / L, take diatomaceous earth to prepare a dispersion liquid with a concentration of 0.012k...

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Abstract

The invention belongs to the field of flame retardants, and particularly relates to a ZIFs nanosheet/chitosan/diatomite hybrid. The hybrid is prepared by combining the nitrogen element of a chitosan molecule with cobalt or zinc ions in a ZIFs nanosheet and then combining an amino group with a hydroxyl group on the surface of diatomite. When the hybrid is added into a polymer, the chitosan can be used as an effective carbon source, the diatomite and the ZIFs nanosheet have a certain physical barrier effect, cobalt oxide or zinc oxide generated by thermal decomposition of the ZIFs nanosheet andacidic active sites on the surface of SiO2 can promote the formation of a compact carbon layer, and the carbon layer has an excellent barrier effect, so that the flame retardance and the smoke suppression performance of the polymer material are improved. The invention also relates to a preparation method of the hybrid. The preparation method has the advantages of low reaction requirements, easilyavailable raw materials, simple technique, and realization of no environmental pollution, greenness and environmental protection by using water as the solvent.

Description

technical field [0001] The invention belongs to the field of flame retardants, and in particular relates to a ZIFs nanosheet / chitosan / diatomite hybrid and a preparation method thereof. Background technique [0002] With the rapid development of polymer materials, it is widely used in various fields of the national economy. However, polymer materials are flammable and release a large amount of toxic and harmful substances during combustion. Some traditional flame retardants contain toxic and harmful substances. With the improvement of people's awareness of environmental protection, people pay more and more attention to the development of low-toxicity and environment-friendly flame retardants. [0003] Diatomaceous earth is a siliceous rock, a biogenic siliceous sedimentary rock composed mainly of the remains of ancient diatoms. Its chemical composition is SiO 2 Mainly, available SiO 2 ·nH 2 O said. my country's diatomite reserves are 320 million tons, and the prospectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K3/36C08K5/3445
CPCC08K3/36C08K5/3445C08K2201/011C08L5/08
Inventor 徐文总闫弘毅钟迪杨凯杜艳平
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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