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Preparation method of starch/agar composite base flame-retardant aerogel

A technology of composite matrix and airgel, which is applied in the field of composite material preparation, can solve the problems of poor compatibility and achieve the effects of avoiding poor compatibility, wide sources, simple and economical process

Inactive Publication Date: 2021-06-29
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to: provide a simple, economical and environmentally friendly method for successfully loading magnesium hydroxide in the starch / agar composite airgel matrix, and solve the problem of poor compatibility between magnesium hydroxide and other polymer materials

Method used

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  • Preparation method of starch/agar composite base flame-retardant aerogel
  • Preparation method of starch/agar composite base flame-retardant aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve 20g of potato starch and 10g of agar powder in 1000ml of distilled water, heat and stir in a stirring pot in a water bath at 99°C until completely dissolved, pour the dissolved mixed sol into a mold placed in cold water for condensation molding, and then pour the formed water The gel sample was frozen in a refrigerator at -40°C, and then dried in a vacuum freeze dryer for 60 hours to sublimate the frozen water to obtain a starch / agar composite airgel.

Embodiment 2

[0024] Dissolve 6.20g of magnesium oxide powder in a small amount of distilled water, stir evenly with magnetic force, and then disperse it ultrasonically for 20 minutes. Add the obtained magnesium oxide suspension to 200ml of the mixed sol obtained in Example 1, and continue heating in a water bath at 99°C Stir for 4 hours, then condense and form in a mold, freeze the obtained composite hydrogel in a -40°C refrigerator, and then transfer to a vacuum freeze dryer to dry for 60 hours to sublimate the frozen water to obtain a starch / agar / magnesium hydroxide composite airgel .

Embodiment 3

[0026] Dissolve 5.17g of magnesium oxide powder and 1.5g of attapulgite clay in a small amount of distilled water, stir evenly with magnetic force, and then disperse ultrasonically for 20 minutes. Add the obtained magnesium oxide suspension to 200ml of the mixed sol obtained in Example 1. Continue heating and stirring in a water bath for 4 hours, and then condense and form in a mold. The obtained composite hydrogel is frozen in a -40°C refrigerator and then dried in a vacuum freeze dryer for 60 hours to sublimate the frozen water to obtain starch / agar / hydrogen MgO / attapulgite composite airgel.

[0027] The invention discloses a method for preparing a starch / agar composite base flame-retardant gas gel, which uses in-situ generation and clay addition methods to carry out flame-retardant modification of the polymer airgel. It is to stir and heat starch and agar powder in a water bath to completely dissolve to obtain a mixed sol of starch / agar; then, the mixed suspension of magnes...

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Abstract

The invention discloses a preparation method of starch / agar composite base flame-retardant aerogel. The preparation method comprises the following steps of: stirring and heating starch and agar powder in a water bath kettle, and dissolving to obtain starch / agar mixed sol; and carrying out ultrasonic dispersion on a mixed suspension of magnesium oxide powder and attapulgite clay, then adding the mixed suspension into the mixed sol, continuing heating and stirring, cooling and condensing to obtain composite hydrogel, freezing the obtained composite hydrogel in a refrigerator, and then freeze-drying in a vacuum freeze-drying machine. According to the invention, starch / agar composite aerogel is used as a carrier skeleton, and a flame retardant magnesium hydroxide is introduced into polymer aerogel in a simple and economical in-situ generation manner, so that the problem of poor compatibility of magnesium hydroxide and a polymer matrix is solved; and by adding the mineral clay which is rich in reserves and has the flame-retardant characteristic, the high addition of the magnesium hydroxide is reduced, the prepared composite aerogel has a good flame-retardant effect, the mechanical property is also improved, and the composite aerogel has a certain application prospect in the field of building heat preservation.

Description

technical field [0001] The invention relates to a method for modifying starch-based airgel by using in-situ generation of a flame retardant and adding clay, and relates to the technical field of composite material preparation. Background technique [0002] Polymer aerogels have broad application prospects in the field of building insulation due to their light weight and porous special structure. Compared with traditional inorganic airgel materials, plant polysaccharide airgel also has the advantages of biodegradability, biocompatibility and environmental friendliness; however, starch / agar-based composite airgel materials have poor mechanical properties and are easily Combustion is an important reason that limits its application in the field of building thermal insulation. [0003] Introducing flame retardants into the airgel matrix is ​​a simple and efficient method to improve its flame retardancy. Magnesium hydroxide is an environmentally friendly flame retardant widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L3/02C08L5/12C08K3/22C08K3/34
CPCC08J9/28C08J2303/02C08J2405/12C08J2201/0484C08J2205/026C08K2003/222C08K3/346
Inventor 黄大建郭鑫强小虎欧阳成伟
Owner LANZHOU JIAOTONG UNIV
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