JPS5918787A - Fron type refrigerant - Google Patents

Abstract

PURPOSE:To obtain titled refrigerant resistant to sludge and/or corrosion development, with high dissolving power and low-temperature fluidity and electrical insulation, by incorporating R-13B1 fron refrigerant with a specific amount of R-115 fron refrigerant. CONSTITUTION:The objective refrigerant can be obtained by mixing (A) R-13B1 fron refrigerant (CBrF3) with (B) 5-35wt% of R-115 fron refrigerant (CClF2- CF2), followed by, if required, further incorporating (C) pref. 0.2-1.0wt/vol.% of a high polymeric hydrocarbon-based additive.

Description

Detailed Description of the Invention Akira Honmaru explains that frozen foods using fluorocarbon-based refrigerants used in 6j freezing are generally stored at a freezing thickness of -20°C to -30'G; As research progresses on this, it has been discovered that even with this level of storage, ice crystals may grow during long-term storage, destroying cell tissue, or causing protein denaturation, rib burns, and hair discoloration due to saponification. It was confirmed that In order to prevent these freezing denaturations over a long period of time, it is necessary to realize a storage temperature of -40°C or lower, particularly preferably -60°C or lower, which is the crystalline point of a good product.

This storage temperature of -40℃ or less is multi-stage (two-stage).
This can be obtained relatively easily using a compression refrigerator. However, multi-stage compression inevitably increases the size and complexity of the equipment, so it is desirable to obtain a storage temperature of around 140'C using the first stage compression silk refrigeration samurai, and for this reason, research and trade on fluorocarbon-based refrigerants is progressing. ing.

R-13B 1 fluorocarbon refrigerant (CBrF*) is -57
It has a low additional point of 75°C, and the critical temperature (67°C) is still low, and the freezing power is low, and the above preservation accuracy is achieved with high-pressure pongee. It is one of the refrigerants. However, when the R-13B1 was actually subjected to continuous rotation, although power was obtained in the initial refrigeration unit, failures in the refrigeration unit continued to occur as the first year of operation progressed. . The causes are not clearly understood, but include changes in properties due to separation of R-1381 (separation of bromine) due to continuous operation, slatch formation due to chemical reactions within the system, and refrigeration in the evaporator. It is believed that one of the causes is residual machine oil (deterioration of refrigerating machine oil return).

In view of these circumstances, the present invention has been devised to reduce the failure rate of refrigerators, since the components of the refrigerant do not change even after long-term operation due to their poor thermal stability. It was developed for the purpose of obtaining a new fluorocarbon-based refrigerant that can be used as a refrigerant and has good refrigerating properties.

The present invention was made as a result of repeated trials by mixing a fluorocarbon-based refrigerant, and basically the above 1ifiR-
5 to 35 for 13B1 Freon refrigerant (CBrF5)
The mixture of wt % R-115 fluorocarbon refrigerant is defined as % acupuncture. R-115 Freon N medium is CCLF*
(: It is a known refrigerant with a molecular formula of pt.

Further, in the present invention, %ta is defined as the addition of commercially recycled water-based refrigerant Zokabata to the above mixture in an amount of 0.2 to 0.2 Owt/vot. By adding this refrigerant additive, the miscibility of the fluorocarbon-based refrigerant of the present invention is improved, and the additional refrigerating capacity can be brought out.

One of the characteristics of the refrigerant according to the present invention is that the R-13B 1 fluorocarbon refrigerant and the R-115 fluorocarbon refrigerant that are mixed do not have an azeotropic point, which is different from the uniformity of the conventional mixture of fluorocarbon refrigerants. It's out of place. That is, the boiling point of R-115 is -
39.1℃, the boiling point of R-13B1 is -57.75℃, and the two additional point temperatures are drastically different, so R-115
It is hard to imagine that a mixture of R-13B1 and R-13B 1 would have an azeotropic point, but as it turned out, the mixture of Japanese fluorocarbon thread refrigerants had surprisingly good thermal stability and freezing ability. It is to demonstrate.

The R-115 fluorocarbon thread forming medium is preferably mixed in an amount of 5 to 35 wt% with respect to the R-13B170 refrigerant.

If it deviates from this 41λ range, the thermal stability will be impaired and the refrigerator will fail, or a constant evaporation temperature will not be obtained.

In the present invention, the properties of the refrigerant are further improved by adding a commercial molecular hydrocarbon refrigerant additive to the fluorocarbon-based refrigerant mixture. This polymeric hydrocarbon refrigerant additive is compatible with the mixture and does not react with the fluorocarbon refrigerant.

This polymeric hydrocarbon refrigerant additive is made of a mixture of commercial molecular hydrocarbons and special inorganic substances, and is manufactured by Daiei Pharmaceutical Co., Ltd.
[From the 5DGJ series, the product name is ``5DG-0'' for fully open type refrigerators, and the product name is ``1'-8DG-IJ'' for semi-closed type and open type refrigerators. In addition, this refrigerant additive is preferably used in a concentration of 0.2 to 1. Owt/vo
t% additive is applied. If it is less than 0.2%, there will be no added young fruit, and if it is mixed in more than 1.0%, it will be mixed, which will inhibit the physical properties of the refrigerant.

As mentioned above, it has been experimentally confirmed that the fluorocarbon refrigerant of the present invention has a remarkable effect in reducing the failure rate of refrigerators, but the theoretical basis thereof is not necessarily clear. Below are some inferences about factors that may be related to reducing failure rates.

(1) Occurrence of Slatch Slatch is caused by a chemical reaction within the system, and unless it is caused by dirt or refrigerating machine oil within the system, chemical changes in the refrigerant can cause coughing. Refrigerants of the present invention, especially l'-8DG
It is thought that those containing J have higher chemical stability and are less likely to cause slatch.

(2) Corrosion It is known that even if the inside of the system is clean, the operating temperature is a cause of corrosion, but when the refrigerant of the present invention is used, the discharge temperature of the refrigerator is, for example, high pressure N17Kt. 5℃~15℃ compared to that of R-13B170n refrigerant under /- condition.
℃ shows a low value. Therefore, it also helps prevent corrosion.

(3) Electrically insulating flons generally have excellent electrical properties, but R-13
B1 has a relatively low insulation resistance, and if refrigerating machine oil or other impurities are mixed in, the AKe resistance will suddenly decrease and there is a risk of leakage.

Since the refrigerant of the present invention has excellent insulation properties, there is no such danger.

(4) The swelling effect of soluble pyl chlorofluorocarbons is generally quite low, but when lubricating oil coexists, there are times when the swelling effect on the insulation material of the refrigerator motor increases.

Invention? This swelling effect of the %f medium is smaller than that of other fluorocarbon refrigerants. However, since the refrigerant of the present invention has low solubility with refrigerating machine oil and can be separated, if it is soft compared with other fluorocarbon refrigerants that have high solubility with refrigerating machine oil, the amount of oil remaining in the evaporator will become less abundant. It becomes less.

(5) Low temperature freezing of sea oil below The refrigerating machine oil remaining in the evaporator flows along the inner surface of the bottom suction pipe and returns to the compressor. In this case, the evaporation temperature is low, so the fluidity of the oil is lost, and the resulting refrigerating machine oil returns poorly, which may cause damage to the compressor motor.

The refrigerant of the present invention is less likely to deteriorate the fluidity of refrigerating machine oil than other fluorocarbon refrigerants, and even if it is still low, it does not react with refrigerating machine oil and has chemical stability.

[Example 1] Refrigeration capacity was investigated using a refrigerant of the present invention having the following composition (1). For reference, R-502 Freon refrigerant and R
-13B1 Freon refrigerant was used to compare the refrigerating capacity under similar conditions.

Composition (1) a) 70-thread mixed refrigerant R-13B1 Freon refrigerant 80wt% R-11570
7 Refrigerant 20 wt% tl-too % b) Polymer hydrocarbon refrigerant additive first coating is: #'#=IlaK 40°C, l
R41 white M#32℃, cuff for refrigerator designation, 5KW (
This is the data for the refrigerant resistant refrigerant capacity of the upper He valley at 60 Hz).

(↓ Bottom margin) As is clear from Tables 1 and 2, the fluorocarbon refrigerant of the present invention has a lower temperature than R-50, although it has a slightly lower temperature than R-13B1.
It has a refrigerating capacity that is over 20% higher than No. 2, and considering that it can reduce the failure rate of refrigerators as mentioned above, it is commercially useful as a low-temperature refrigerant.

Patent applicant: Daiei Pharmaceutical Co., Ltd. Daiei Foods Co., Ltd. Pesto-F Co., Ltd. Agent Kunio Miura 543-

Claims (3)

[Claims] (1) A fluorocarbon refrigerant characterized by mixing 5 to 35 wt% of R-115 fluorocarbon refrigerant to R-1381 fluorocarbon refrigerant. (2) For h-t3B+Freon refrigerant, fe-1157
Mix 5 to 35 wt of 0 ton intoxicant, and add 0.2 to 1. A fluorocarbon-based refrigerant that has an Owt/vot% molecular ashing water line refrigerant. (3) In claim 2, the pre-molecular carbon 4L water-based yarn cooling m additive is a 70/Po imperial medium having the product name rsDGJ in the D4 table of the Great Song Music Industry Association.