反相悬浮聚合法制备相变蓄冷材料及其应用

为提升吸水树脂（superabsorbent resin, SAR）的吸水能力，增加其用作蓄冷材料的潜热，采用了单因素实验结合Box-Behnken试验的方法，将反相悬浮聚合法制备SAR的条件进行了优化，并通过双孢菇的贮藏实验表明了其蓄冷效果。结果表明:制备SAR的最优反应条件为:交联剂为单体丙烯酸（AA）质量的0.06%，引发剂0.9%，分散剂4.38%，淀粉10%，中和度75%，反应单体AMPS:AA为1:10，反应温度65 ℃，产物单位吸水量为573.26 g/g；吸水量的增加提升了制备蓄冷材料在保温箱中保持环境低温的能力，可以在12 h内基本保持10 ℃以下的低温环境，而且在25 ℃条件下，可以更好地保持双孢菇色泽，抑制失重、刺激气味的产生和质构的变化，表明通过优化SAR吸水性对其蓄冷性能的提升可以更好地保持双孢菇贮藏品质。

Preparation and Application of Phase Change Cold Storage Material by Inverse Suspension Polymerization

In order to elevate the water absorption capacity of the superabsorbent resin(SAR) and increase the latent heat when used as the cooling materials, the method of combining Box-Behnken test and single factor experiment were used to optimize the conditions for preparing SAR by reverse phase suspension polymerization. The storage experiments of Agaricus bisporus showed its cooling effect. The results showed that the optimal reaction conditions for preparing SAR: crosslinking agent was 0.06% of the monomer acrylic acid(AA) mass, initiator 0.9%, dispersant 4.38%, starch 10%, neutralization degree 75%, AMPS:AA=1:10, reaction temperature was 65 ℃, and the unit water absorption of the product was 573.26 g/g. The increase in water absorption improved the ability of preparing cold storage materials to keep the environment low in the incubator, and could basically maintain a low temperature environment below 10 ℃ within 12 hours under the condition of 25 ℃, furthermore, it could better maintain the color of Agaricus bisporus, inhibit weightlessness, off-odor and texture change, which indicated that the improvement of SAR water absorption could better maintain the storage quality of Agaricus bisporus.