| In this thesis,the thermal insulation waterborne multicolor coatings are taken as the research object,and their supporting coating system is designed.The bottom layer is a barrier-type thermal insulation coating,and the surface layer is a reflective thermal insulation multicolor coating,The effect of exterior wall coating integrating high decoration,reflective thermal insulation and energy saving has been realized.And phosphorylated nanofibrilated celluose(P-NFC)is used as the suspension agent of mutilcolor coatings,which effectively improves the thixotropy of mutilcolor coatings.In the study of the bottom barrier type thermal insulation coatings,by studying the application of SiO2 aerogel,hollow glass microspheres,hollow ceramic microspheres and expandable microsphere thermal insulation functional materials in coatings,it is found that only one thermal insulation material is used.SiO2 aerogel has the best thermal insulation effect,the optimum addition amount is 5.7%,and the temperature difference between the thermal insulation coatings and the ordinary coatings is 5.02℃at 400 μm coatings thickness.By controlling the variable method to study the improvement of the thermal insulation performance of the coatings by the composite thermal insulation filler,it is found that SiO2 aerogel is used as the main thermal insulation component,and the hollow ceramic microspheres and hollow glass microspheres are the synergistic thermal insulation components,and the ratio is 1:1.2:0.3 composite barrier insulation filler has the best thermal insulation performance.The study found that the optimum addition amount of composite thermal insulating fillers in ordinary coatings and elastic coatings are 10%and 6%,respectively,and the temperature difference between ordinary coatings without adding thermal insulating fillers could reach 11.7℃ and 9.0℃,respectively,and the two coatings both met the basic performance requirements of coatings.In the study of the reflective thermal insulating multicolor coatings on the surface,rutile titanium dioxide Altiris-800 was selected as the reflective filler,and the optimal addition of Altiris-800 was found to be 8%.Total solar reflectance(TSR)and nearinfrared reflectance(NIR)can reach 82.1%and 85.8%,respectively.The composite barrier type thermal insulation filler has no effect on the reflective performance of the coatings.Through the compare on the influence of iron-based pigments,inorganic reflective pigments and organic reflective pigments on the TSR and NIR of the coatings.It is found that the organic reflective pigment has the best reflective effect.Finally,the organic reflective pigment is selected for the preparation of the reflective and thermal insulating multicolor surface layer,and it is combined with the thermal insulating elastic bottom layer and the thermal insulation ordinary bottom layer.The temperature difference of the multicolor coatings can reach 27.3℃ and 29.3℃ respectively.The building energy-saving simulation of reflective thermal insulating multicolor coatings shows that it is most suitable for temperate monsoon climate zones and temperate continental climate zones,and can reduce energy consumption by about 2-4 KWh/m2 and carbon emissions by 1-3 kg/m2.In order to meet the requirements of the suspension stability of multicolor particles in the storage of waterborne multicolor paints,the thesis finally selects P-NFC and the traditional suspension thickener hydroxyethyl cellulose(HEC),hydrophobic modified alkali-soluble emulsion(HASE)and purchased suspending nanofibrilated celluose(SNFC)for comparison.It is found that P-NFC not only has a lower addition amount of 0.33%to achieve the suspending effect,but also is better than other groups in terms of water,acid and alkali resistance.At the same time,it has better thixotropy,and the viscosity drops by about 25%when subjected to high-speed shearing.The excellent thixotropy of P-NFC is also beneficial to the storage and construction of multicolor paints. |
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