How to cure the hottest epoxy composite gas cylind

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How to cure epoxy composite gas cylinders is excellent

in order to manufacture composite gas cylinders, experts used infrared spectroscopy, dynamic modulus analysis (DMA) and other methods to study the reaction curing degree, glass transition temperature (TG) and mechanical properties of epoxy resin matrix for composite gas cylinders cured according to different heating systems by using the principle of bridge balance test, so as to investigate the influence of curing temperature on the properties of resin matrix, The advantages and disadvantages of the two curing systems are compared and analyzed. The results show that the addition of accelerator can effectively reduce the curing reaction temperature, and the degree of cure can reach more than 95% after curing at 80 ℃ for 8h; The result is similar to that of curing at 130 ℃ for 4 hours. The test shows that the matrix formula can be used as the resin matrix formula for high-performance wet winding composite gas cylinders. Due to its high specific strength and modulus, low expansion coefficient, corrosion resistance, electrical insulation and other advantages, resin matrix composites are widely used in cutting-edge industries such as aerospace and shipbuilding, and in the fields of automobiles, buildings, sports products and so on. In particular, the development of pressure cylinders is more rapid, and the commercial consumption of composite cylinders is increasing

in resin matrix composites, resin plays the role of connecting fibers and transferring stress, so the performance of resin directly affects the overall performance of composites. The performance of resin itself is affected by many factors, such as raw materials, proportion, process molding, curing conditions, etc., of which curing is an important link in the molding process. Resin curing is the cross-linking reaction of polymer materials, that is, the resin changes from linear molecular structure to like macromolecular structure. When the same resin system is heated and cured, due to the different curing time and curing temperature, it can form molecular structures with different physical and mechanical properties, even with great differences. The resin cannot be cured completely in a short time or at a low temperature, while a long time or at a high temperature will cause unnecessary waste of energy and even damage its performance. In addition, the selection criterion of resin is generally to achieve the best match with its elongation slightly higher than that of fiber, and to obtain an elongation much higher than the use requirements at the expense of other conditions, which is a waste of performance. Therefore, it is extremely necessary to seek the best curing temperature rise system according to the specific use requirements

through physical and chemical analysis methods such as infrared spectroscopy, DMA and mechanical testing, experts studied the casts cured by e-51/ddm epoxy resin system for composite gas cylinders under different curing systems, and analyzed the influence of curing system on resin properties, laying a foundation for the application of epoxy resin in composite gas cylinders. Through DSC thermal analysis of resin system, casting body test, casting preparation, casting body performance test and other links, the curing DSC of resin system was analyzed and calculated, the casting body performance was tested, and the influence of curing system on the performance of resin matrix was studied: epoxy e-51/ddm resin system, the curing degree, tensile and bending strength of the resin at 130 ℃ curing temperature did not further improve, and even the mechanical strength decreased slightly, But its heat resistance and fracture elongation are improved; For this experimental resin system, the curing reaction process has time temperature equivalence. When the maximum temperature is 80 ℃, extending the curing time can still achieve higher curing degree and better mechanical properties; Choosing the appropriate curing accelerator and the appropriate amount can effectively reduce the curing reaction of epoxy resin system. The deformation amplifier unit of the deformation measurement system is one of the main components of the experimental machine, so that it can be fully cured at a lower temperature; The epoxy e-51/ddm resin system of this research topic has excellent comprehensive performance and low cost. All test properties used to manufacture composite high-pressure gas cylinders meet the design requirements, which proves that this formula can be used as the resin matrix formula for wet winding high-performance composite gas cylinders

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