Resin matrix applicable to microwave curing and preparation method of resin matrix

Abstract

The invention discloses a resin matrix applicable to microwave curing and a preparation method of the resin matrix, and belongs to the field of preparation of composite materials. Polar mulfunctional high-performance epoxy resin is used as main body resin; an active diluent is added to adjust the viscosity of a resin system so as to enable the resin to adapt to liquid forming processes such as winding; a novel compound curing agent is selected to adjust the curing activity of the resin matrix, and nanofiller is added to improve the microwave responsiveness of the resin matrix and realize the mechanical property, the heat resistance and the size stability of the resin matrix; by the adjustment of the structures and the proportions of components such as the main body resin, the curing agent, the diluent and the nanofiller, the resin system which is proper in microwave responsiveness and curing activity, excellent in comprehensive mechanical property, high in heat resistance, high in size stability and low in viscosity and is applicable to microwave curing is developed, has a great guidance significance for preparation of a fiber composite material, and can be widely applied to the field of aerospaces and the like.

Description

technical field [0001] The invention belongs to the field of composite material preparation, and mainly relates to a microwave-curable resin matrix and a preparation method thereof. Background technique [0002] Due to the characteristics of light weight, high strength, high temperature resistance, corrosion resistance, and excellent thermodynamic properties, resin-based composite materials have been more and more widely developed and applied in aerospace, medical, electronics, machinery and other fields. At present, resin-based composite materials are mainly cured by traditional thermal curing methods, which have disadvantages such as long curing cycle, high energy consumption, and low curing efficiency. The degree of curing in the direction is different, which makes it difficult for the resin to cure uniformly, and it is easy to generate large internal stress. In addition, the traditional thermal curing method is also easy to cause deformation and even degradation of the ...

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Problems solved by technology

However, due to the low polarity of the selected resin matrix, it has no good response and curing activity to microwaves, resulting in the strength and other properties of the cured resin being lower than those obtained by traditional thermal curing methods.

R.Yusoff et al [Journal of Engineering Science & Technology.2007,2(2):151-163] used microwaves to cure carbon fiber / epoxy resin RTM molding composite materials, although the cured product obtained a degree of curing equivalent to that of traditional thermal curing methods , but due to the high viscosity of the selected resin matrix and the large difference in microwave response between the matrix and the carbon fiber, there are obvious defects in the composite material, which greatly reduces the overall mechanical properties of the composite material

Generally speaking, there are some technical deficiencies in the microwave-curable resin matrix reported in the literature: first, the composition of the resin matrix is ​​single, the molecular polarity of the selected resin is low, the microwave response of the entire resin matrix is ​​poor, and the final curing degree is not high; The microwave curing process of the resin matrix is ​​too simple, the microwave curing efficiency is low and the matching with the microwave reactivity of the resin is poor; the third is that the viscosity of the resin matrix is ​​high, and the interface wettability with the fiber is poor, so it cannot be used for liquid molding processes such as winding

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