化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (6) : 231-234.

开发与应用

冷冻产品用无机盐相变蓄冷材料的制备及性能研究

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Preparation and performance of inorganic salt phase change material for frozen product

Dai Jun¹, Lu Lixin^1,2, Qiu Xiaolin^1,2

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Received		Published
2017-02-14		2018-07-03
Issue Date	Revised Date
2018-07-03	2017-02-14

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摘要

研制了一种适用于冷冻产品贮藏运输的高效低温无机盐相变蓄冷材料。将NH₄Br、KCl、CaCl₂等无机盐与NH₄Cl复配,利用差式扫描量热仪(DSC)筛选了NH₄Br-NH₄Cl无机盐共混物作为主储能剂,通过添加不同成核剂改善过冷性能,添加不同浓度的黄源胶改善相分离。结果表明:以30%(wt,质量分数,下同)NH₄Br-NH₄Cl无机盐共混物作为主储能剂,1% SrCl₂作为成核剂,5%黄原胶作为增稠剂可获得相变温度为-18～-22℃、相变潜热为288.7J/g、过冷度小、无相分离的相变蓄冷材料。NH₄Br-NH₄Cl无机盐共混物作为主储能剂能够达到冷冻产品温度且对相变潜热影响较小,SrCl₂作为成核剂基本无过冷,黄原胶作为增稠剂解决相分离具有显著效果。

Abstract

To prepare the low-temperature inorganic salt phase change material for storage and transportation of frozen products.Composite phase change materials were prepared from ammonium chloride (NH₄Cl) and ammonium bromide (NH₄Br) which was selected by differential scanning calorimetry (DSC) from ammonium bromide (NH₄Br),potassium chloride (KCl) and calcium chloride (CaCl₂).The different kind of nucleating agents were added to improve the supercooling performance,different concentration of xanthan were added to improve the phase separation.Results were that the composite salt system with 30wt% NH₄Br-NH₄Cl was used 1wt% SrCl₂ as nucleating agent and 5wt% xanthan as thickener,in which almost no phase separation and low supercooling occurred.The latent heat remained 288.7J/g and the phase change temperature was -18～-22℃,which was suitable for frozen product requirements.Experimental results showed that NH₄Br-NH₄Cl system can reach the target temperature and had little effect on the latent heat.SrCl₂ as nucleating agent and xanthan as thickener can improve supercooling and phase separation effectively.

关键词

冷冻产品 / 过冷度 / 增稠剂 / 蓄冷材料

Key words

frozen product / supercooling / thickener / phase change material

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冷冻产品用无机盐相变蓄冷材料的制备及性能研究[J]. 化工新型材料, 2018, 46(6): 231-234 DOI:

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