摘要
研制了一种有较高相变潜热、低Onset温度,适用于农产品贮运保鲜的高效安全有机物水溶液相变蓄冷剂。从初选的甘氨酸、赖氨酸、山梨醇、脯氨酸、葡萄糖等5种有机物中,利用DSC法筛选了相变潜热较高的甘氨酸水溶液为主储能剂,再与0.1 mol/L的丙三醇进行复配获得更低的Onset温度。以质量分数为0.1%的苯甲酸钠作为防腐剂延长蓄冷剂的使用期限,并用高吸水性树脂作为基质,得到蓄冷剂的最终配方为:甘氨酸0.4~0.8 mol/L,丙三醇0.1 mol/L,苯甲酸钠质量分数为0.1%,其余为水,并添加质量分数为0.75%~0.81%的SAP作为基质。通过调节甘氨酸浓度,可获得相变潜热为296.4~305.9 J/g,Onset温度为-7.3^-5℃的系列有机物水溶液相变蓄冷剂,并且无明显过冷度和相分离现象,安全性好,具有应用前景。
An effective organics solution phase change materials （PCMs） with high phase enthalpy change and low onset temperature was developed, which can be applied to store and preserve several kinds of agricultural produces with different optimal storage temperature. Glycine, lysine, sorbitol, proline and glucose were preselected and determined with the differential scanning calorimetry （DSC） , and glycine solution was chosen as the main energy storage materials due to its highest phase enthalpy change among these five materials under the same onset temperature. To achieve a lower onset temperature, glycine was matched with 0. 1 mol/L glycerol solution and 0.1% sodium benzoate was added to extent self-life of PCMs and super-absorbent polymers （SAP） as matrix. The final formula of the organics solution PCMs was 0.4 ～ 0. 8 mol/L glycine, 0. 1 mol/L glycerol, 0. 1% sodium benzoate and water with 0.75% ～ 0.81% SAP as matrix. A series of this organics solution PCMs could be prepared with the change of the concentration of glycine solution, whose phase enthalpy change was 296. 4～ 305.9 J/g and onset temperature was -7.3 ～-5℃. Furthermore, there was almost no supercooling and phase separation phenomenon and it was safe and practical.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2015年第2期208-212,207,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家高技术研究发展计划(863计划)资助项目(2012AA101704)
关键词
农产品
保鲜
相变蓄冷剂
有机物水溶液
Agricuhural products Preservation Phase change materials Organics solution
