Research On Ultraviolet Rigidification Technology Based On Acrylate Resin For Inflatable Structure

The inflatable deployment of the structure is an effective method for reducing mass and improving packaging efficiency when manufacturing large spacecraft,which can save a lot of mass and volume.The stiffness of the structure needs to be achieved by curing.Ultraviolet curing has many advantages.It is of great significance to research the ultraviolet curing of the expanded structure.This subject takes the space inflatable structure as the application background,focusing on the research of acrylic curing materials that adapt to the space environment,and proposes two different kinds of rigid solutions.In order to solve the problem that the resin UVcuring rate is too slow under certain application conditions,a fast UV curing technique is proposed.In order to solve the requirement of adapting to the low stiffening trigger power of the space and avoiding the problem of uneven resin distribution caused by resin flow during the folding process,a UV/UV two-stage curing technology is proposed.This provides new ideas for the application of UV rigiding technology in large space inflatable deployable structures.In the research process of rapid ultraviolet rigidification technology,acrylate resin which can be cured by ultraviolet light in 2 seconds was designed and prepared.Regulate the types,dosage and curing system of various components of acrylate resin,and explore the influence of the kinetics of UV curing polymerization of acrylate resin.After 2 seconds of irradiation,C = C can achieve a curing conversion rate of more than 50% and a resin gel rate of more than 75%.The dynamic mechanical analysis and tensile test characterization prove that the resin has excellent performance.The glass fiber is used as the reinforcement to prepare the fast-curable composite material,and its mechanical properties can fully meet the actual needs of the inflatable deployable structure.A light/light stage curing system with one-stage free radical initiation and twostage cation initiation was designed.Selecting a specific initiator,using a filter device to control the ultraviolet wavelength of different curing stages,to control the two reactions to proceed independently in steps,and innovatively prep aring an acrylateepoxy two-stage curing resin system.By changing the type of acrylate resin and the ratio of acrylate to epoxy resin,the first-stage cured product prepared is elastic and can be folded 180° without creases.This solves the resin flow pro blem during the folding of the inflatable deployment structure.The elastic modulus of the final product of the two-stage curing is 598.73 MPa,which meets the needs of the inflatable deployment structure.After adding the oligomer to the acrylate resin sys tem,the resin cured in the second stage can have shape memory properties.The shape fixation rate of the resin at room temperature is 96.1%.Heating at 80°C,the resin shape recovery rate was 82.2% within 1 min.This expands the application scenario of two-stage curing,can realize fine-tuning of the shape of the structure space after expansion,and has the repairability of shape damage.The acrylate resin system designed in this paper has broad application prospects in the field of inflatable deployment structures.