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Modified silicon dioxide aerogel microsphere thermal-insulation coating

A technology of silicon dioxide and thermal insulation coating, applied in epoxy resin coatings, coatings, fibrous fillers, etc., can solve problems such as affecting the thermal insulation performance of coatings, improve physical properties, thermal insulation properties, and good weather resistance , Improve the effect of interface state

Active Publication Date: 2014-12-24
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The modified silica airgel microspheres have strong hydrophobicity and high surface tension. After adding the polymer emulsion, mutual repulsion of the interface will inevitably occur, and at the same time, it is difficult for the microspheres to form a uniform dispersion in the coating. , thereby affecting the thermal insulation performance of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0045] (1) Preparation of silica sol: use 208.33g of tetraethyl orthosilicate as the silicon source, mix ethyl orthosilicate with 92.14g of absolute ethanol, stir evenly, and obtain the mixed solution ①; another 92.14g of Mix water ethanol with 72g deionized water, then add 1ml of 2w% nitric acid, stir evenly to obtain a mixed solution ②, mix the mixed solutions ① and ② and stir for about 5 minutes to obtain the final mixed solution, place the mixed solution in In a 60°C water bath, keep warm for two hours;

[0046](2) Preparation of silica wet gel microspheres: Silica sol was introduced into the atomizer through the drainage tube, and the 0.1mm atomizer nozzle was immersed in 500ml of peanut oil. The peanut oil was kept stirring, and the switch of the atomizer was turned on. During the atomization process, a stirring speed of 800 r / min was maintained. Through an atomizer, the silica sol gel is injected into the peanut oil in the form of small droplets. The volume of the sol...

example 2

[0052] (1) Preparation of silica sol: Mix absolute ethanol and deionized water in a certain proportion, and then add ethyl orthosilicate to the mixture, in which ethyl orthosilicate, deionized water, and absolute ethanol The masses were 208.33g, 72g, and 322.49g, and then 1ml of 2w% nitric acid was added and stirred evenly to obtain the final mixed solution. The mixed solution was placed in a 60°C water bath and kept warm for two hours;

[0053] (2) Preparation of silica wet gel microspheres: Silica sol is introduced into the atomizer through the drainage tube, immerse the 0.1mm atomizer nozzle in 500ml silicone oil, keep the silicone oil in a stirring state, and turn on the atomizer switch. During the atomization process, a stirring speed of 900 r / min was maintained. Through the atomizer, the silica sol exists in the silicone oil in the form of small droplets. The volume of the sol injected with silicone oil was 100ml. After the atomization is completed, add 3ml of 20w% amm...

example 3

[0059] (1) Preparation of silica sol: Mix 460.7g of absolute ethanol with 72g of deionized water, then add 288.33g of ethyl orthosilicate to the mixture, then add 1ml of 2w% nitric acid, stir well, Put the mixed solution in a 60°C water bath, add 118.62g of dimethyldiethoxysilane to the mixed solution after 8 minutes, and keep the mixed solution for two hours;

[0060] (2) Preparation of silica wet gel microspheres: the silica sol was introduced into the atomizer through the drainage tube, and a 0.3mm atomizer nozzle was used. Use peanut oil as the oil phase, keep the rotation speed of the peanut oil at 800r / min, and spray the silica sol into the peanut oil. During the atomization process, a stirring speed of 800 r / min was maintained. The volume of sol sprayed into 500ml peanut oil is 100ml. After the atomization is completed, add 3ml of 20w% ammonia water to the mixture of sol and peanut oil, and age at room temperature for two days to obtain silica wet gel microspheres;

...

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Abstract

The invention discloses a thermal-insulation coating by taking hydrophobic silicon dioxide aerogel microspheres as thermal-insulation packing. The coating is prepared by the following main steps: preparing the hydrophobic silicon dioxide aerogel microspheres; and mixing the prepared hydrophobic silicon dioxide aerogel microspheres and a polymer emulsion to prepare the thermal-insulation coating. Hydrophobic modification of the silicon dioxide aerogel microspheres includes the following two modes: in one mode, silicon dioxide wet-gel microspheres are modified by adopting halogenated hydrocarbon and in the other mode, alkoxy silane, silazane or siloxane is added into a mixed solution in a sol preparing stage. When the coating is prepared, a surfactant is added, so that the compatibility between the hydrophobic silicon dioxide aerogel microspheres and the polymer emulsion can be improved, the dispersibility of the microspheres in the coating can be improved, the coating quality can be improved, and the thermal-insulation performance of the coating can be improved.

Description

technical field [0001] The invention relates to a novel heat-insulating paint which uses hydrophobic silicon dioxide airgel microspheres as functional fillers. Silica airgel microsphere is a porous amorphous material with an irregular three-dimensional network skeleton structure. The thermal insulation coating prepared with it as the main filler is light and environmentally friendly, has low density and good thermal insulation. The present invention can be widely used in thermal insulation of inner and outer walls and roof surfaces of public buildings such as residential buildings, schools, hospitals, factories, etc., thermal expansion damage protection of large-volume buildings or facilities such as bridges and dams, and protection of ships, trains, buses, etc. The protection of the top sunshine surface and many other fields. Background technique [0002] Thermal insulation coatings can improve the working environment and reduce energy consumption by preventing heat conduc...

Claims

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Application Information

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IPC IPC(8): C09D133/00C09D163/00C09D7/12C04B26/14C04B26/06C09C1/28C09C3/12
Inventor 何方郑伟李荣春张德印吴菊英黄渝鸿王宏雁马秋花朱贺马武刚
Owner HENAN UNIVERSITY OF TECHNOLOGY
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