JPS6060177A - Freezing mixture for cooling - Google Patents

Abstract

PURPOSE:To provide a freezing mixture which has an excellent cooling effect and rapidly gives low temp. according to the purpose and place of use, by dissolving a mixture of potassium thiocyanate and urea is a.q. ammonia. CONSTITUTION:A mixture of potassium thiocyanate and urea in a weight ratio of 3:2-2:3 is dissolved in a.q. ammonia (with an ammonia to water ratio of 1:4).

Description

[Detailed Description of the Invention] This invention uses potassium thiocyanate and urea. 1'l = A compound is used as a cryogen, and this is ammonia. IJJ, 4
The purpose of this invention is to provide a near-terminal cryogen.

Conventionally, g agents that cool the ambient temperature by absorption have been commercially available, but most of them utilize the phenomenon of absorbing ambient heat during a chemical reaction with water.This invention aims to obtain a simple cryogen with good cooling effect, and as a result of extensive experiments, the ratio of potassium thiocyanate and urea that provides the lowest temperature as a cryogen is 3:2 to 2.
Use the mixture of =3 as a cryogen and dissolve it in aqueous ammonia9.
By completing this, the purpose has been achieved.

Ammonium chloride and thiocyanide, commonly used as cryogens? Based on the results of an experiment using a mixture of 1. mulberry potassium, 1.1 ammonium, and urea salt dissolved in water, 1. , chamber a30"C, liquid 'AA 28' (
', '/) Temperatures obtained by adding 100 parts of water to 100 parts of water are shown in Table 1 below.

From the above results, it is clear that the lowest temperature is obtained when potassium thiocyanate alone or a mixture of potassium thiocyanate and chlorine is used as the cryogen.

In the table above, for the mixture of potassium thiocyanate and urea that provides the lowest temperature, 25 g of a cryogen with different mixing ratios is mixed with 25 g of aqueous ammonia (1:4) as a solution.
As shown in Figure 1, a mixture of potassium thiocyanate and urea (4,0) was obtained from 15g:10g to lOg. : The lowest temperature is obtained in the range of 1 sg,
The mixing ratio of thiocyan r4!2 potassium: urea is 3 = 2 ~
In the 2:3 range, with water? A result that is 1.1 lower than when using g-shavings can be obtained, and a cooling effect that cannot be obtained with 11' and 1-shavings can be obtained.

However, in the case of a cryogen that is a mixture of potassium (thiocyanate, INI) and ammonium nitrate, only one of the base
'The temperature of kumquat is below the minimum temperature of talCt.

Since the fire broke out, it can be said that the low temperature obtained from the 3:2 to 2:3 mixture of thiocyanine fjjs:potassium and urea of the present invention and aqueous ammonia is due to the effect of the omelette bed used f11).

Next, the minimum temperature and temperature change over time for different mixing ratios of potassium thiocyanate and urea are shown in Figure 2f52, where the room temperature is 30°C and the liquid temperature is 28°C.
At C, when 25 g of the cryogen l, lij, 25 me of K1:4 ammonia water was added to the mixed soil, it became I (low temperature 1) in about 1 minute after the addition of the ammonia water, and thiocyan]
The combination ratio of γIL of Sho potassium and IA4 wood is 3:2 to 2:3.
711J characteristics of 'n Kodaku No. 3.4.5! 1! 3 to 1
．． 4 of 4,)? Attached (li general low 7 crystallinity: 4 minutes old 11.
Even if it is 6, it can be seen that ε2 has an excellent cold beating effect.

Next, Hon≧Ming +, 4□1149! About l□Boberu.

Fruit, 7iI! I'l! /su1 To a mixture of 15 g of potassium thiocyanate and 10 g of urea, add 25 rl of 1:4 aqueous ammonia in another volume) -1:÷'+'T'j J- (J and add When using, add 74ml of ammonia water to the mixed cryogen.

Actually, aqueous ammonia is stored and sealed in a soft synthetic fat bag that is easily torn, such as a commercially available cold) ζlI 1jll, and potassium thiocyanate and urea are mixed.1. Taanajime 1
Strong soft 4fi joint, housed in a resin outer bag x1
i=, Close [7, When in use, put 1'lE outside, 'J11, put the bag of ammonia water inside (11 Tsurikan 1 size and NjL) (, -r, ka, :, +j ＞ "f %; t f well/kome," Two outer bags for money: "r ',': ri!
etc., then there is.

Above actual f+: Example of low temperature resistance 1. i3-o": Hiyu 1'1'
It! The changes in iT- are as shown in Table 2 below.

In addition, below(, (1's il!ll', 5H uni:
(rj: chamber) M> 3 0 °CN it 4:
To find out the positive kiL8 connection ψ− at 28 °C, mix 21
↓t Ikll is the power of people.

To this, add all of Anne J [-nia water and γi'11 1"
Table 2 Example 2 12.5 g of potassium thiocyanate and 12.5 g of urea. sg? (Tcl: 4 ammonia water 2
5m/'' (all of which were added with 5 and other &:]: Everything was the same as in Example 1, and the process was carried out in the same manner). It's 111.

Ijmi 3

[Brief explanation of drawings]

Figure 1 of the attached drawings shows the relationship between the mixing ratio of potassium thiocyanate and urea and the minimum temperature according to the present invention, and Figure 2 shows the minimum temperature and the temperature change over time. 1te 11: Ill ;;'>! It is. Agent -7P 10th day 1) Akira

Claims (1)

[Claims] Dissolve the mixture of potassium thiocyanate and urea in aqueous ammonia! A cooling agent that has a characteristic of r.