Study On The Properties And Application Of Flexible Textile Materials In Architecture

In the 21st century,China's great economic leap forward at the same time to promote the rapid rise of the building complex,the application of textile materials in the building has become an indispensable part,the multi-functional flexible textile composite material(construction film material)is favored by the construction industry.Based on the flexible textile material in building according to the practical application of the selected typical architectural membrane material(aluminum foil,PVC,PTFE architectural membrane material),In accordance with relevant standards,study the basic properties of the flexible textile material,thermal protection performance,etc.,and according to different season temperature,flexible insulating textile material stays,put forward the concept structure layer and,on the basis of orthogonal experiment,study the effects of other factors on heat insulation performance.In this paper,a heat transfer model of flexible thermal insulation material is established,combined with the basic requirements of roof thermal insulation and energy saving in green building evaluation standard,the roof thermal insulation structure model is analyzed,and the thermal performance parameters of different structure models are calculated,which further embodies the heat insulation optimization in green environmental protection.First of all,according to the relevant test standards,the basic properties of these kinds of membrane materials were tested,including:the appearance and shape of the material,infrared spectrum analysis,mechanical properties test,waterproof performance test,flame retardant performance test.The results showed that the characteristic peaks were the same as the molecular structures of PVC and PTFE.Scanning electron microscope can see the fiber,coating and interface of the base cloth,and there are some small particles and holes in the coating part.Aluminum foil,PVC,PTFE film material surface moisture resistance is good,have good waterproof performance;PTFE film has the best tensile property and PVC film has the best tearing property.Aluminum foil film material belongs to combustible material,the limit oxygen index of PVC film material is 29~33,reaching the flammable grade,and the limit oxygen index of PTFE film material is 41~43,reaching the non-flammable grade.And the thickness of each material is almost proportional to the flame retardant performance,that is to say,for the same material,the greater the thickness,the better the flame retardant performance.For thermal,thermal decomposition temperature of the aluminum foil membrane material at about 225?,the thermal decomposition temperature of PVC membrane material at about 250?,the thermal decomposition temperature of PTFE membrane material at about 500?,comprehensive view of PTFE membrane material high temperature resistant performance in several material belongs to one of the best.The comprehensive insulation value Z of PTFE building film is smaller than the other two materials,and its thin PVC building film is the highest 0.65mm.For"layer and structure",the spacing distance,material and thickness are all factors affecting the thermal insulation,among which the spacing distance(including the amount of still air)is the main influencing factor.When the illumination time increases,the temperature rise rate of the heat insulation material increases.According to the heat transfer principle of the heat insulation material,the temperature change has no effect on the convection heat transfer basically,but has a greater effect on the heat conduction and heat radiation of the gas phase.The thermal conductivity of aluminum foil,PVC and PTFE building film materials increases with the increase of temperature.When the temperature is relatively high,the molecular thermal motion inside the film material will be enhanced and the thermal conductivity of the material will increase.Aluminum foil is mainly attributed to the role of gas phase thermal conductivity and thermal radiation.Three methods of heat transfer,solid conduction,convection and radiation,are analyzed.Flexible insulation heat transfer model is established and the different layer and the theory of membrane material coefficient of thermal conductivity,and on the basis of the green building evaluation standard heat transfer coefficient calculation formula,calculates the different layer and the heat transfer coefficient of the membrane material,with the standard energy-saving heat transfer coefficient(0.9W/m~2.K)do contrast,found that the heat transfer coefficient of single-layer membrane material(5.535W/m~2.K)is greater than the standard values,part of the layer and the membrane material(0.577~0.582W/m~2.K)than the roof of the energy-saving building standard heat transfer coefficient is small.From the perspective of green environmental protection,the heat transfer coefficient of"two-layer thin PVC+4cm static air"is the smallest,and the energy saving rate is up to 35.84%,which reflects that the heat insulation performance of this"layer and structure"building film material meets and is better than the energy saving standard when used in the green building roof.