关键词: 相变蓄冷剂, 茶提取物, 充冷, 放冷, 冷效系数

Abstract: The present study aimed to explore the freezing-thawing characteristics of phase change coolants (PCC) that can be used to keep aquatic products and the influence of tea extract on the characteristics of the PCC in the temperature between -5℃ and -1℃. In this study, using sodium chloride, potassium chloride, glycine, glycerol and other PCC materials, combined with tea polyphenols (TP) or green tea powder (Tf), a series of phase change cold storage agents were prepared, and the cold-effect coefficient (Cec) was used as the index, combined with its the freezing-thawing, we compared the freezing-thawing characteristics of each PPC and the influence of tea extract on the freezing-thawing characteristics of PPC. The results showed that the freezing-thawin characteristics of the PPC of the organic and inorganic composite system were better than the PPC of the pure organic water-liquid system or the pure inorganic water-liquid system; Adding tea extracts such as tea polyphenols and tea powder could improve the freezing-thawing characteristics of the PPC. Combining the Cec and the appearance analysis and the step freezing-thawing process of the PPC, comprehensively considered, the effect of PCC (G2) was better than others, and it was suitable for the preservation of aquatic products.