| As bag filter became increasingly prevailing,the usage of high-performance fiber filter material as the core supplies has ascended massively.The service life period of filter material is about 2~4 years.Although the waste filter cannot be further used as filter,it still possesses characteristics of high temperature resistance and corrosion resistance,and the strength retention rate is generally over 70%.At present,there are many problems with methods for recovering waste filter,such as large recycling energy consumption,high cost,high recycling requirement and applying the methods tends to produce secondary pollution.So it is difficult to achieve the industrialized recovery scale,and more difficult to recover multi-component composite filter materials.In this study,polyphenylene sulfide(PPS)/ploy tetra fluoro ethylene(PTFE)waste filter(PF filter)was chosen as the research model.After pre-classification(or screening)and mechanically washing of the recycled filter materials,the recycled PF filter material is designed with flame retardant resin,carbon fiber fabric and flame retardant foam core combination paving layer.Three kinds of composite plates were fabricated by vacuum perfusion molding,which verified the feasibility of PF filter as fiber reinforced material in the field of composite materials.Flexural properties,interfacial peeling strength,thermodynamic properties and flame retardancy of the composites were tested,and effects of damp-heat on the thermodynamic properties and flexural properties of the composites were investigated.Finally,according to the advantages and characteristics of different types of composite materials,the potential application fields of fiber reinforced composites prepared by waste fluorine ether filter materials are analyzed in combination with market products.Main conclusions include items below:(1)After cleaning,macroscopic and microscopic morphology of PF filter material shows that mechanical water-scrubbing is capable of removing most of dust particles,and there is no obvious damage on the fiber surface of the old filter material.The tensile strength of the old filter material in two different directions is lower than that of the new filter material,and the tensile strength retention rate is 70.4 and 75.8 respectively.Toxic substances and heavy metals appeared in filtermaterial after cleaning.Except for decreased content of fluorine atom and increased content of oxygen atom,no significant changes were detected.Waste filter retained most of its characteristics,therefore it's highly valuable to recycle waste filter.(2)The interfacial strength of Carbon fiber panel/Filter material interface is the highest;that of filter material panel/foam core interface second to the highest;that of carbon fiber panel/foam core interface lowest.The interfacial strength of the filter material and the carbon fiber reached 38.19±5.5 N,which is 4.14 times the strength of carbon fiber and foam interface,both of which are processed by the same technology.(3)The results of composite bending test show that the depreciation of the filter material has no significant effects on the flexural strength of the double layer filter material and the flexural modulus of the carbon fiber-reinforced Double-layer filter sandwich composite material.The composite material made from filter material used as the fiber reinforced system can effectively eliminate the disadvantage of the loss of the strength engendered by depreciation of waste filter.(4)The depreciation of the filter material and the damp-heat effect decrease energy storage modulus,loss modulus and TG of the composite.Compared with the new filter material reinforced composites,the composites with the old filter material have better durability to damp heat.(5)Because the flame retardancy of the composite material is affected by the low flame retardancy of the resin matrix and foam core,the flame retardancy of the composites can be greatly improved by improvement of the flame retardancy of resin matrix and foam core,making a wider application prospect of the filter material reinforced composites. |
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