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Preparation method of polyaniline/straw-based silica aerogel and thermal-insulation anticorrosive coating

A technology of thermal insulation coating and silicon aerogel, which is used in anti-corrosion coatings, coatings and other directions to achieve the effects of small porosity, good thermal insulation effect and low thermal conductivity

Active Publication Date: 2021-07-16
吉林省陆柒肆伍贰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polyaniline aerogels are mostly cross-linked with polyaniline and synthetic polymers, or composited with cellulose-based carbon aerogels, and composited with straw-based silicon aerogels.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of composite airgel: burn rice straw in a muffle furnace at 600°C to obtain straw ash, mix the straw ash with 5% NaOH solution at a solid-to-liquid ratio of 1:5, and heat at 80°C Heating for 2.5 hours, suction filtering to obtain straw-based water glass; add deionized water according to the volume ratio of water glass to deionized water 1:10 and stir until completely dissolved; then add hydrochloric acid with a concentration of 10% to it, adjust the pH to 1, and add Add the mixed solution of aniline and hydrochloric acid (water glass: aniline=3:1) in the solution, the mixed solution volume ratio of aniline and hydrochloric acid is 1:10 (concentration 2mol / L hydrochloric acid), stirred 1.0 hour under ice bath, then to Add ammonium persulfate solution (concentration: 2 mol / L, mol dosage with aniline: 1:1) to the system, keep the temperature of the system not higher than 5 degrees, after the addition is completed, continue to react for 3 hours to complete the po...

Embodiment 2

[0038]Preparation of composite airgel: burn rice straw in a muffle furnace at 600°C to obtain straw ash, mix the straw ash with 5% NaOH solution at a solid-to-liquid ratio of 1:5, and heat at 80°C Heated for 2.5 hours, suction filtered to obtain straw-based water glass; water glass and deionized water were added in deionized water at a volume ratio of 1:7 and stirred until completely dissolved; then adding concentration of 10% hydrochloric acid to it, adjusting the pH to 2. Add a mixed solution of aniline and hydrochloric acid (water glass: aniline=6:1) to the solution, the volume ratio of the mixed solution of aniline and hydrochloric acid is 1:10 (concentration 2mol / L hydrochloric acid), stir for 1.0 hour under ice bath , and then drop ammonium persulfate solution (concentration 2mol / L, 1:1.1 mol dosage with aniline) into the system, keep the temperature of the system not higher than 5 degrees, after the addition is completed, continue to react for 3 hours to complete the pol...

Embodiment 3

[0040] Preparation of composite airgel: burn rice straw in a muffle furnace at 600°C to obtain straw ash, mix the straw ash with 5% NaOH solution at a solid-to-liquid ratio of 1:4, and heat at 80°C Heating for 2.5 hours, suction filtering to obtain straw-based water glass; add deionized water according to the volume ratio of water glass and deionized water respectively 1:15 and stir until completely dissolved; Hydrochloric acid, adjust the pH to 2, add the mixed solution of aniline and hydrochloric acid (water glass: aniline=5:1) to the solution, the volume ratio of the mixed solution of aniline and hydrochloric acid is 1:10 (concentration 2mol / L hydrochloric acid), ice bath Stir at low temperature for 1.0 hour, then dropwise add ammonium persulfate solution (concentration 2mol / L, the mol dosage with aniline is 1:1.1, keep the system temperature not higher than 5 degrees, after the dropwise addition is completed, continue to react for 3 hours The polymerization reaction is com...

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Abstract

The invention belongs to the technical field of coatings, and discloses a preparation method of polyaniline / straw-based silica aerogel and a thermal-insulation anticorrosive coating. The preparation method of the polyaniline / straw-based silica aerogel comprises the following steps of (1) mixing and heating straw ash and a NaOH solution, carrying out suction filtration to obtain straw-based water glass, adding deionized water, and stirring to obtain a straw-based water glass solution, (2) adding hydrochloric acid to adjust the pH value, adding a mixed solution of aniline and hydrochloric acid, dropwise adding an ammonium persulfate solution, and keeping the temperature not higher than 5 DEG C until the polymerization reaction is completed, (3) after the reaction is completed, dropwise adding a NaOH solution until the pH value is 7-9, standing to form hydrogel, aging and standing the hydrogel, and respectively soaking the hydrogel with ethanol and deionized water to obtain straw / polyaniline composite hydrogel, and (4) drying treatment. The polyaniline is prepared through in-situ polymerization in the acid catalysis process of the silicon-based aerogel, and the obtained aerogel is high in compressive strength, small in porosity, low in heat conductivity coefficient and excellent in heat preservation effect.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a preparation method of polyaniline / straw-based silicon airgel and thermal insulation and anticorrosion coatings. Background technique [0002] Crop waste straw is a renewable and biodegradable natural polymer material. The reuse of waste straw has always been a hot spot in the field of materials research, and some achievements have been made. For example, Huang Fei et al. A straw aerogel with heavy metal ion adsorption properties was prepared. Another example is "Study on the Preparation Process and Network Structure of Straw-Based Airgel" published by Yang Rui, in which crop straws are prepared into straw-based aerogels, turning waste into treasure and increasing the added value of crop straws. [0003] Polyaniline has excellent anti-corrosion properties and is widely used in anti-corrosion coatings. At present, polyaniline aerogels are mostly cross-linked with polyaniline a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L79/02C08K7/26C09D133/14C09D5/08C09D7/61
CPCC08J9/286C08J2205/026C08J2379/08C08K2003/2241C08K2003/2296C09D5/08C09D143/04C09D7/61C09D7/70C08L79/02C08L1/284C08K13/04C08K7/26C08K7/28C08K3/22
Inventor 信欣
Owner 吉林省陆柒肆伍贰科技有限公司
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