| As an important new material,the architectural membrane is the fifth kind of building materials after the iron and steel,cement,wood and glass.It has the advantages of light-weight,light-transmission and energy-saving,fire-retardant,flexible and has been widely used in Stadium,exhibition center,railway stations,airport hall,entertainment center and other large public facilities.Especially the PTFE-fiberglass architectural membrane which is self-cleaning and has excellent resistance to aging and UV,is applicable to the permanent buildings.Compared with other architectural membranes,PTFE-fiberglass membrane has the outstanding superiority and broad market prospects.The domestic research on architectural membranes has a late start and there are not much studies of the production of PTFE membrane materials.We have no mature technology and most of our PTFE membranes are rely on imports,which restricted seriously the domestic development of architectural membrane materials and membrane structure building.Therefore,the purpose of this subject is to exploit PTFE membrane materials and study its production process as well as their properties.In this study,superfine glass fiber woven plain fabric is used as the reinforce fabric of the membrane material,utilizing dipping coating process to make the surface coated PTFE resin.The research on the heat treatment of fiberglass yarns is conducted.The paper selects four parameters and designs a L9(34)orthogonal experiment based on which 9 kinds of PTFE membranes are manufactured.Then tests on these membranes’ properties and research on the impact of different factors on the various properties are conducted.And finally,the optimization of membrane material preparation process is reached through the comprehensive analysis,aiming to provide guide and instructions for industrialized production of PTFE membrane materials.Firstly,the effect of heat treatment on the performances of fiberglass yarn is researched through temperature and tension in this paper.The results have shown that with the rise of temperature of heat treatment,the infiltration agent residues and the tensile strength of fiberglass yarn gradually decrease.With the increase of tension added on the yarns,the infiltration agent residues and the tensile strength gradually rise.Taking all factors into consideration,the method of adding tension to fiberglass fabric from warp direction is feasible.Secondly,four parameters are selected to designs a L9(34)orthogonal experiment,involving PTFE solid content,baking temperature,sintering temperature and time.Nine kinds of PTFE architectural membrane are manufactured and the analysis of the preparation process is also conducted.Thirdly,the performance tests which including the gram per square meter,thickness,fineness,tensile and tear properties of these nine kinds of membrane materials are carried out.The results show that they can basically meet the requirements of main properties comparing with that of domestic and abroad similar products.The color change of PTFE membranes after UV-irradiation is studied in the paper.Based on the analysis of the test data with statistical methods,we get the rules and effects of the four factors on all the properties.The results have shown that the factors of PTFE solid content and sintering time are major ones,while the baking and sintering temperatures play a second role within limits.At last,according to all the analysis,the optimal parameters of preparation of PTFE membrane materials have been obtained.Finally,we summarize some conclusions of this subject and point out some shortages and some suggestions for further researches,which can provide some valuable references for the manufacture of PTFE membrane materials. |
PDF Full Text Request