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Preparation of SiO2 Aerogel/St-BA Emulsion by In-situ Polymerization and Its Application in Insulation Coating

Author: WangHui
Tutor: LiaoZhengFu
School: Guangdong University of Technology
Course: Polymer Chemistry and Physics
Keywords: SiO2 airgel Styrene-acrylic emulsion Thermal Insulation Coatings In situ composites
CLC: TQ630.4
Type: Master's thesis
Year: 2011
Downloads: 80
Quote: 0
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Abstract


Aqueous insulation coating applied to the surface of the substrate can effectively reduce the internal temperature of the substrate, and the substrate has a good protective effect. Therefore, the research and development of new insulation coating is an important research topic. SiO2 airgel is a dispersion medium is a gas gelling material, its porosity is as high as 80% to 99.8%. Exhibit many unique properties due to the unique nature of its structure, SiO2 airgel. Its most typical feature is the thermal conductivity is very low, the thermal conductivity is only at room temperature under atmospheric pressure of 0.013W / (m · K), is currently the world's minimum thermal conductivity of the solid materials. Therefore, the SiO2 airgel coatings made from insulation coatings with good application value. Firstly modified the SiO2 airgel surface with a silane coupling agent KH570 then by seed emulsion polymerization process the SiO2 airgel modified styrene-acrylic emulsion in situ composites, through theoretical studies and Conditions experiments to determine the The best ratio of raw materials and process conditions. Finally, the synthesis of SiO2 airgel / styrene-acrylic emulsion as base material prepared by thermal insulation coatings. And using self insulation effect test apparatus the heat insulation effect of the thermal barrier coating was measured. The SiO2 airgel surface modification results: KH570 content of 5% by the particle size analysis shows, SiO2 airgel particle surface modification effect. By infrared spectra analysis, it can be found, KH570 has been grafted onto the surface of the SiO2 airgel particles. TEM analysis shows KH570 on SiO2 airgel particle surface modification, the dispersion of the particles has been significantly improved. The SiO2 airgel / phenylpropanoid situ composite emulsion test results: SiO2 airgel content of 4%, the soft and hard monomer ratio of 50/50, 4% functional monomer acrylic, emulsifiers SDS/OP-10 content for 3% and SDS/OP-10 optimum ratio of 2/1, the initiator ammonium persulfate was 0.5%, the emulsion has good overall performance; seen by the results of DSC analysis, a glass transition temperature (Tg pure emulsion ) only 24.79 ℃, the SiO2 airgel / phenylpropionate situ composite emulsion glass transition temperature rises to 29.32 ° C. Through infrared spectra analysis, the the the SiO2 airgel surface has grafted polymer. The emulsion was compared with the rules can be seen by TEM, spherical silica airgel composite styrene-acrylic emulsion dispersion significantly improved after modification. The insulation coating test results: SiO2 airgel content of 4% when coating hardness reaches 4H, and resistance to UV aging performance significantly improved. Best obtained by comparing the different content of SiO2 airgel coating temperature curve was 4% SiO2 airgel insulation effect, the content of 1%, the worst heat insulation effect. Simulation of the actual insulation effect, the results show that the thermal insulation coatings have better insulation effect, the the backplane temperature difference of the sample and blank glass warming balance above 10 ℃. SEM observation of the surface and inside of the coating products morphology seen, the dense coating surface, internal scaly hole. The TGA results show that: the high thermal stability of the product, only 4% of the heat loss before 331 ℃. Compared with conventional insulation coatings insulation coatings prepared this article, we can see the insulation coatings prepared in this paper, gloss, color fullness or color than conventional thermal insulation coatings. As can be seen from the above conclusions, the insulation coating has good mechanical properties and significant insulation effect, and therefore has a high potential value.

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