Cold storage material composition, cold storage material, and transport container
A technology for cold storage materials and compositions, which is applied in heat exchange materials, chemical instruments and methods, packaging, etc., can solve the problems of volume expansion, limitation of hazardous material load, latent heat of fusion, poor thermal conductivity, etc., and achieve small volume expansion. , good reproducibility
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Embodiment 1～7 and comparative example 1～7
[0125] As a cold storage material composition, the aqueous solution containing a metal salt (A) and an inorganic salt (B) or an inorganic salt (C) by the composition (mol%) shown in Table 1 or Table 2 was prepared.
[0126] About the obtained aqueous solution, the measurement and evaluation using the ultralow temperature thermostat were performed. The evaluation results are shown in Table 1 or Table 2. However, only the evaluation results of reproducibility are shown with respect to the heating and cooling rate of 2.5° C. / min.
[0127]
[0128] As can be seen from Table 1, the compositions of Examples 1 to 7 maintain a constant melting temperature over a long period of time with good reproducibility in the range of -75°C to -40°C, and have little variation in melting temperature and melting behavior. In particular, the composition of Example 5 maintained a constant melting temperature for the longest time, and melted stably in the range of -75 to -40°C regardless of the heat...
Embodiment 8～16
[0138] As a cold storage material composition, the aqueous solution containing a metal salt (A) and an inorganic salt (B) by the composition (mol%) shown in Table 4 was prepared. The thickener shown in Table 3 was added to the prepared aqueous solution with the composition (% by weight) shown in Table 4, and it stirred well until it became a gel.
[0139] Measurement and evaluation using a cryogenic thermostat were performed on the obtained gel composition. It should be noted that the rate of temperature rise and fall was uniformly 1.0°C / min. However, only in Example 16, the heating and cooling rate was 0.5°C / min.
[0140]
[0141]
[0142] For Example 5 in Table 1, gelation stability when 1% by weight of the thickener shown in Table 3 was added to the aqueous solution was evaluated. As a result, hydroxyethyl cellulose was rated as ⊚, guar gum was rated as ◯, dextrin and polyvinylpyrrolidone were rated as △, and others were rated as ×.
[0143] Therefore, regarding th...
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