Study On Shape Stabilized Encapsulation And Corrosion Of Glauber’s Salt-based Phase Change Materials

With the supply shortage of energy and environmental pollution problems have become increasingly prominent,it is imperative to promote the development of renewable energy.However,renewable energy such as solar energy is usually intermittently supplied,which severely constrained the development and utilization of renewable energy.Phase change materials are considered as an important solution to the problem of the mismatch of energy supply in time and space due to its characteristics of absorbing or releasing thermal energy during the phase change process.As a typical solid-liquid phase change materials,Glauber’s Salt-based phase change materials needs to be encapsulated before it can be used,and hydrated salt phase change materials usually have the problem of phase delamination,which restricts the service life and popularization.In this paper,two micro-encapsulation methods are used to achieve the shape stabilized encapsulation of Glauber’s Salt-based phase change materials,which has good cycling stability.The corrosive effect of Glauber’s Salt-based phase change materials on polymer materials was discussed,and the safety of Glauber’s Salt-based phase change materials was further improved.In the first part of this paper,a modified diatomite/Glauber’s Salt-based composites phase change materials was prepared by vacuum impregnation.In the experiment,the surface of diatomite particles was first modified to enhance its thermal conductivity,and then a vacuum impregnation method was used to prepare a diatomitesupported composite phase change materials.The load of hydrated salt in the composite phase change energy storage material is 60 %,and the latent heat of phase change is 74.43 J/g.After 100 cycles of tests,the latent heat of phase change is 71.22 J/g,which is 4.5 % lower,and the cycling stability is better.In the second part of this paper,Glauber’s Salt-based microencapsulated phase change materials with silica shell were prepared.Using tetraethoxysilane(TEOS)and 3-aminopropyltriethoxysilane(APTES)as the silicon source,cyclohexane as the oil phase,and the solution of the Glauber’s Salt-based phase change materials as the water phase and surfactant for Span80 and Tween80.The results show that the latent heat of microencapsulated phase change materials is 76.9 J/g.After 100 cycles of tests,the latent heat of phase change is 64.3 J/g,the cycling stability is better.The third part of this paper uses gravimetric method to explore the corrosive effect of Glauber’s Salt-based phase change materials on common polymer packaging materials.Seven polymer materials were selected,and their mass changes were measured after 100 days of soaking.The results show that the quality change rate of the polyamide and phenolic laminated cardboard is large,and the quality change rates of the other five polymer materials samples are all below 0.5 %.Among them,The polystyrene mass change rate is only 0.067 %,which shows good compatibility.