| The architectural membrane construction material is a kind of flexible composite,which is usually obtained by the composite process using fiber assembly as the reinforcement and functional resin as the matrix.Compared with traditional building materials,architectural membranes have the advantages of light weight,seismic resistance,and flexible design.At present,PTFE(polytetrafluoroethylene)has been widely using due to its excellent self-cleaning property and aging resistance.However,during the production of PTFE membranes the temperature would be as high as 400?,which consumes a lot of energy,has a great potential safety hazard,and the choice of the reinforcements is limited.This paper replaces PTFE with FEVE fluororesin,develops FEVE/polyester membranes,tests and analyzes the mechanical properties of the final material.The main contents are as follows:First of all,the high-density glass fiber fabrics that are conducive to the development of the membrane are selected for exploration process.and then this paper summarizes the problems that need to be avoided in the produce process;on this basis,high-density fiberglass fabrics are used as reinforcements,and the orthogonal design is used to explore the effects of curing temperature,curing time,and number of coating layers on the tensile and tear properties of the material,and the most optimized parameter is obtained,when the curing temperature is 160° C,the curing time is 4min,and the coating layer number are 3 layers,the tensile and tear properties of the materials are relatively suitable.Secondly,according to the actual demand of the factory,high-strength polyester plain woven fabrics with a density of 9*9 are used as the reinforcements,and the effects of curing temperature and curing time on the tensile and tear properties of the material are explored,and the most optimized parameter is obtained,when the curing temperature is 160° C,the curing time is 4 min,the materials have good mechanical properties;and chlorinated paraffin is added as the plasticizer in the resin,which reduces the brittleness of the final film material and effectively improves the tear strength of the film material.Thirdly,it's described that the FEVE resin that is used in the final production process.And the actual production of FEVE/polyester membranes is divided into two stages of pre-treatment and coating-curing,so that the entire film production process is introduced.The pre-treatment stage mainly includes the resin pre-treatment,fabric refining and drying.The curing process includes:preparation before coating,coating process,curing process,cooling and winding process.Then,in this paper,the uniaxial tensile properties,uniaxial tensile properties,cyclic load tensile properties,and stress relaxation of the FEVE/polyester membranes are tested and analyzed according to the actual application conditions.The proper model is used to fit the data.Results indicate that the FEVE/polyester membranes are typically anisotropic materials.The tensile curve can be divided into three stages and the piecewise function can be used to fit the curve;after the cyclic effect,the linearity of the material's elongation increases,but the strength declines;and the generalized three-element model is suitable to fit the six-hour stress relaxation curve.Finally,the conclusions drawn from some of the topics are summed up,and the problems and suggestions for research in the subject were put forward.It is hoped that they will provide some reference for subsequent research. |
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