Study On The Warping Deformation Of Thermosetting Composite Polystyrene Foam Insulation Board

G-type thermosetting composite polystyrene foam insulation board(TEPS)(density <200 kg/3m)is a new type of insulation board,which is easy to warp and curl when applied in external wall insulation system.In order to solve the warping and curling of TEPS insulation board,the temperature and humidity warpage prediction model of TEPS insulation board is established by finite element method.The warpage deformation test of the board under different temperature and humidity is designed,and the model is demonstrated and evaluated.Through model analysis and test,the warping deformation mechanism of insulation board is obtained.On this basis,by adding calcium stearate,silicone hydrophobic agent,fly ash,tailing sand and curing method,the method of restraining the warping deformation of the insulation board is discussed.Through the study,the following conclusions are drawn:(1)The prediction error of temperature and humidity warpage is small,and the established warpage model can accurately predict the warpage of the insulation board(2)The model calculation and test show that the deformation ratio caused by humidity is as high as 24 times of temperature deformation,and the warping deformation of insulation board is mainly caused by humidity difference,and the temperature difference has little effect on deformation.(3)The method of adding calcium stearate into TEPS insulation board and coating with silicone hydrophobic agent,the insulation board has hydrophobicity and can stabilize the humidity difference on both sides;the method of adding fly ash and tailings to restrain the expansion and shrinkage of the insulation board;the method of covering the curing film can control the moisture absorption and moisture absorption and deformation ability of the insulation board,thus reducing the warpage deformation.