Preparation And Properties Of Thermal Insulation Coatings For Building Exterior Wall

Energy demand has increased due to society’s high-quality development in many areas,and energy conservation and emission reduction have recently gained attention.Building materials are in high order due to the excellent effect of the Chinese construction sector.As building materials products need more energy,buildings account for 46.7 % of all energy consumption.Conserving energy in buildings can help realize the "dual carbon" development plan for reducing emissions.As a result,thermal insulation coatings have progressively emerged as a "new force" in the field of energy efficiency in buildings.As a result,this topic chooses substrates and materials for thermal insulation through tests,investigates how various materials perform in terms of thermal insulation,selects the best coating formula,and creates thermal insulation coatings that adhere to national regulations.The following are the primary research findings:(1)This thesis selected acrylic emulsion as the emulsion base material;titanium dioxide,vermiculite,hollow glass microspheres,and heavy calcium were used as functional pigments to prepare a thermal insulation coating.According to the national standard,the basic properties and heat insulation effect of styrene-acrylic,pure acrylic and silicone-acrylic emulsion coatings were tested.The results showed better pencil hardness,surface drying time,bonding strength and heat insulation performance of the pure acrylic emulsion coating and the prepared coating.The pure acrylic emulsion was selected as the emulsion base material of the formula.When the optimum addition amount was 35 %,the heat insulation temperature difference of the coating was 23.9 °C.(2)The thermal insulation properties of hollow glass microspheres,expanded perlite,vermiculite,wood fibre and sepiolite insulation materials were tested.The experimental results showed that the thermal insulation performance of hollow glass microspheres was the best,and the thermal insulation performance of vermiculite was the second.Vermiculite and hollow glass microspheres were used as thermal insulation fillers to prepare thermal insulation coatings.At the same time,the thermal insulation effect of hollow glass microspheres with three different particle sizes was investigated.The test results showed that the hollow glass microspheres with the K20 model had thermal solid insulation performance,and the thermal insulation temperature difference was 18.6 ℃.Four different types of titanium dioxide were selected to test the thermal insulation performance.The results show that the coating made of R-996 titanium dioxide has the best thermal insulation performance,and its thermal insulation temperature difference can reach 18.7 °C.(3)The single variable experiments of titanium dioxide,hollow glass microspheres,vermiculite and heavy calcium functional fillers were studied.According to the results of single-variable experiments,four factors and three levels of orthogonal experiments were carried out.The experimental results show that the amount of vermiculite is 7 %,the amount of titanium dioxide is 15 %,the amount of hollow glass microspheres is 10 %,and the amount of heavy calcium is 8 %.The temperature difference of the coating prepared by this ratio is20.9 °C.In this thesis,the addition effect of hollow glass microspheres at different rotational speeds was tested.The experiment showed that better dispersion could be achieved at 400r/min,and the prepared coating had the best thermal insulation performance.The thermal insulation properties of the coating film under different brushing thicknesses were tested.The results showed the layer had good thermal insulation when the brushing thickness was 1.5 mm.The performance of the coating prepared by the experiment was tested according to the national standard,and the test results met the indicators.