| The traditional coolant has certain liquidity in the use process which from solid into liquid,especially when used in the refrigerator,the shaking of cool storage agent will produce too much load,and easily leak because of packing.In order to overcome these problems,Phase change material complexed with super absorbent resin is a new good way.The aim of this study is to develop a series of non-toxic and low cost phase change material complexed with super absorbent resin whose phase transition temperatures in the temperature range of-6?~0? and which has high latent heat,no supercooling and phase separation.In this paper,we focus on the screening of main energy storage agents,the elimination of supercooling and the combination of superabsorbent resins.Based on a lot of literatures,we selected sodium acetate,ethyl lactate,pentaerythritol,propylene glycol,glycerol,sodium benzoate and A material of seven kinds of material as the primary storage material.Through the DSC,the experiment has confirmed the materials that meet the requirements of the subject and the composite monomers which can be compounded.The study found that,the latent heat of pentaerythritol,ethyl lactate and sodium benzoate solution was higher,which are good compound monomers.Due to the Onset temperature of A aqueous solution which is always swings around-15? that much lower than other materials has no obvious relation with the concentration,so it can be used to adjust the eutectic phase transition temperature of the mixture.Through comparison and analysis of the result of the preliminary screening and distribution,five kinds of main energy storage agents I,II,III,IV and V whose Onset temperature in the range of 0 ?~-6 ? were obtained respectively.Because I,II,III,IV,V five kinds of main energy storage agents have different degrees of supercooling phenomenon,and the undercooling is above 2,so the experiment was carried out to eliminate the supercooling phenomenon by adding nucleating agent.The results show that diatomite can completely eliminate the supercooling of five kinds of main energy storage agents,and its suitable dosage in the five main energy storage agents is 0.1 %,0.02 %,0.02 %,0.1 % and 0.2 %respectively.In order to determine whether the super absorbent resin is suitable as the carrier of the main energy storage agent,this study synthesized hemicellulose-AA super absorbent resin,hemicellulose-AA-TEGDA super absorbent resin and hemicellulose-AA-SSS superabsorbent resin on the basis of the formula and process of the preparation of hemicellulose super absorbent resin in the previous laboratory by water bath heating method,and explore the different water absorption multiple and different water absorption rate of hemicellulose super absorbent compound on the thermal physical properties of solution.The results show that the addition of hemicellulose super absorbent resin have little effect on the Onset temperature,latent heat and undercooling of the solution.The hemicellulose super absorbent resin can be well used as the main energy storage agent carrier.On this basis,the study had done a further investigation in absorption rate,absorption rate and liquid rate of hemicellulose-AA-SSS super absorbent resin in the five kinds of main storage agent,the results show that the order of Water absorbency: II > III > I > IV > V,the time required for saturation absorption: V > IV > II > II > I,retaining capacity of liquid: I > II > III > IV> V.Among them,the absorption rate is up to 237g/g,the rate of liquid absorption is fast,and the saturation state can be finished in 180 min,and the liquid holding capacity is good,and the liquid retention rate is between 30%~50%. |
PDF Full Text Request