| Basalt fiber was an inorganic nonmetallic fiber that was different from traditional fibers.It has good mechanical properties,acid and alkali corrosion,heat insulation and other excellent performance.Preparation of basalt fiber raw materials were natural basalt ore,It has low cost of raw materials and adequate sources,would not cause the impact and pollution to the human body and nature.It was a green material.However,the basalt fiber has some defects,the surface of the fiber was relatively smooth,as the reinforcement and the resin matrix between the knot and not good,thus affecting its composite material to some excellent performance.Therefore,it was very important to study the surface modification of basalt fiber.As a new type of material textile composite materials have many excellent features,such as high strength,high modulus,light characteristics.Three-dimensional textile composites overcome the shortcomings of traditional composite materials,and the use of three-dimensional textile technology could be a variety of high-performance fibers woven into different shapes of preforms.Corner interlock fabric composite material was a kind of three-dimensional composite material,the structure of the fabric in the ordinary loom could be completed,the processing was relatively simple and more flexible design.In this paper,basalt fiber was used as raw material to weave three-dimensional interlocking fabric through small sample loom.The use of coupling agent to modify the basalt fiber to improve the interface between the fiber and resin compatibility.Then use the vacuum-assisted resin molding process to fabric into a composite material.The microscopic morphology of basalt fiber was analyzed by scanning electron microscopy(SEM).The chemical composition of the basalt fiber before and after the modification was analyzed by infrared spectroscopy.The resin-based composites were stretched and the three-point bending test.The influence of the surface modification of coupling agenton the mechanical properties of three-dimensional interlocking fabric composites was analyzed.The influence of coupling agent modification on basalt fiber composites was analyzed by acoustic performance test.The surface of the fiber after the modification of the coupling agent was observed by scanning electron microscopy.Some particles attached to the surface.With the increase in the concentration of coupling agent,these particles were more and more,between the monofilament appeared and hold.It was because the density of the coupling agent on the surface of the fiber increases as the concentration of the coupling agent increased,resulting in the phenomenon of partial particle aggregation.At the same time could also be observed that the fiber surface of the film was also getting thicker.The Research indicated that:the basalt fiber was subjected to infrared spectroscopy to observe the change of its chemical composition.In the coupling agent treatment,the coupling agent and the reaction between the resin to generate polar hydrogen bonded to make them more closely.The fibers were adhering to each other so as to provide a better condition for the entanglement between the fibers.Composite material stretching,bending experiments shown that:after the coupling the tensile properties of the composites agent modification were improved.Overall,the concentration of 8% of the samples in the tensile test of the mechanical performance of the best,concentrations greater than 8% of the samples with the concentration of the indicators were reduced.Through the acoustic experiments of composite materials could be drawn that:The fiber volume fraction of the material before and after the coupling agent was slightly increased,but the difference was not significant.In a certain frequency range,the modified composite material was better than the untreated composite material.It was possible because that the thickness of the composite material was increasedlead to that the sound insulation performance was increased. |
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