Study On Anti-aging Property Of PVC Film Materials For Building

As a typical representative of modern architecture,membrane structure is widely used because of its low price,excellent performance,economic and environmental protection.But at present,the environmental pollution is more and more serious,it has a great influence on the appearance and durability of buildings.While building membrane structural materials are directly exposed to the atmospheric environment and affected by the natural environment such as sunlight,temperature,rain and dust.While building membrane structural materials are directly exposed to the atmospheric environment and affected by the natural environment such as sunlight,temperature,rain and dust.Its various properties will be continuously degraded with the aging time,which will shorten the service life of the building membrane structure,causing death,injury and property loss.In recent years,the research on the material properties of architectural membrane structural materials has achieved certain results,but the research on its durability is not comprehensive enough and still need to be improved.Durability is very important for membrane structure architecture.If decrease the durability will cause structural instability and shortens the service life of membrane structure,so improving the durability of membrane structure is an important research topic.However,the ability to improve the durability of membrane structure in China is not well developed and needs to be developed.In order to explore the durability of building film materials after aging,this paper takes polyvinyl chloride(PVC)building film materials as the research object,conducted scanning electron microscope experiment,contact Angle test experiment,and carries out scanning electron microscope experiment,contact angle test experiment,chroma experiment and uniaxial tension experiment on the film materials with artificial accelerated aging and those removed from the existing buildings,that is natural aging film materials.The main research contents and results are as follows:(1)Through comparison,it is found that the natural aging environment is complex and the aging time is long,which can obtain the characteristics of the late aging of the coating.The failure mode of the coating is similar,all show coating aging cracking,powder off,etc,on the structure of the aging film material can reflect the real aging situation.However,in the artificial aging test,due to the single aging time condition and limited aging time,the coating shows the characteristics of initial aging.Whether natural aging or artificial accelerated aging,can not meet the design requirements,had to replace the membrane surface to restore the initial appearance of the membrane structure.(2)Along with the aging time,the number of architectural membrane material contact angle smaller,hydrophobic performance is abate,water is not easy to drop,easy penetration into the membrane material,and color changes,the membrane surface yellowing,side friction is bigger,pollutants will not because of the weight of water shower,factors such as the wind blowing down easily,cause self-cleaning anti-fouling membrane material performance.(3)At the same time,whether natural aging or artificial accelerated aging,the damage of PVC materials in building membrane structure under longitudinal stretching goes through three stages: the first stage is the elastic stage;the second stage is the extension stage of damage;the third stage is the final destruction stage.With the extension of aging time,the tensile strength decreases gradually.The comparison between natural aging and artificial accelerated aging shows that the aging rate of artificial accelerated aging is higher.