Sodium silicate hydrate(SMN),gas-phase SiO2 and sodium pyrophosphate decahydrate(TPD)were added to disodium hydrogen phosphate dodecahydrate(DHPD)as a nucleating agent,and sodium alginate(SA)and xanthan gum(GX)were added as thickening agents.The optimal ratio of nucleating agent and thickening agent for this hydrated salt was optimized by step-cooling experiments,melt-cooling cycle and optical microscopy observation.The experimental results showed that the DHPD composites had excellent enthalpy of phase transition(249.5 J/g),very low supercooling(1.4 ℃),no phase separation,and a phase transition temperature of 31.0 ℃ after the additions of 4.0％SMN and 1.0％SA,and the composites still possessed high enthalpy(239.4 J/g)after 100 thermal cycles.
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