JPS59147075A - Freon refrigerant - Google Patents

Abstract

PURPOSE:To provide a novel freon refrigerant having high thermal stability, keeping the original composition even after a long-term operation, and giving little troubles of the refrigerator, by mixing R-13B1 freon refrigerant with R-115 freon refrigerant. CONSTITUTION:The objective freon refrigerant is prepared by mixing (A) R- 13B1 freon refrigerant (CBrF3) with preferably 10-25wt% of R-115 freon refrigerant (CClF2-CF3), and if necessary, adding (C) 0.2-1wt/vol% of a polymeric hydrocarbon as a refrigerant additive to the above mixture.

Description

[Detailed description of the invention] The present invention relates to a fluorocarbon-based refrigerant used in a refrigerator.

Frozen foods are generally stored in freezers at temperatures between -20°C and -30°C, but as research into freezing denaturation of foods progresses, it is becoming increasingly difficult to keep ice at this temperature during long-term storage. It was confirmed that crystals grew, cell tissues were destroyed, and protein denaturation, fat burning, discoloration due to oxidation, etc. progressed.

To prevent these freezing denaturations over a long period, -40
°C or less, particularly preferably 60 °C below the eutectic point of one food product
It is necessary to achieve the following storage temperature.

Such a storage temperature of -40° C. or lower can be achieved relatively easily using a multi-stage (two-stage) compression refrigerator. However, since multi-stage compression inevitably increases the size and complexity of equipment, research on fluorocarbon-based refrigerants is progressing.

R-13 old fluorocarbon refrigerant (IL: BrF,) is -57.7
It has a low temperature of 5°C and a relatively high critical temperature (67°C), and has a high refrigerating capacity at low temperatures, making it one of the cold tofu products that can achieve storage temperatures in the 2nd category through middle-stage compression.

However, when this R-1381 was actually operated continuously, although the initial refrigerating capacity was obtained at the beginning, the refrigerator continued to malfunction as the year passed after the start of operation.

The causes are not always clearly understood, but include breakdowns due to motor burnout, summer pressure being -14, overload current flowing at startup, overload relay activation resulting in shutdown1-, and cooling due to sludge formation. capacity reduction,
Due to continuous operation, changes in properties due to R-13Bl (decomposition of bromine), residual refrigeration oil in the generator (worsening of refrigeration oil return), and high pressure above the design pressure. It is believed that this is due to gas leakage from the condenser, etc.

In view of these concerns, the present invention aims to reduce the failure rate of chilled tofu by having high thermal stability and not changing the components of chilled tofu even after long-term operation. L1's aim was to obtain a new chlorofluorocarbon-based cold tofu that has high quality and high refrigerating capacity.

The present invention was made as a result of repeated experiments by mixing various fluorocarbon-based refrigerants.
It is characterized by mixing R-115 fluorocarbon refrigerant with 3B170 refrigerated tofu (C, BrF,).

R-115 Freon refrigerant is a well-known refrigerant having a molecular formula of CGIF, -OF, O.Furthermore, the present invention adds a polymeric hydrocarbon refrigerant additive of 0.2 to It is characterized by adding 1.0 Vt/volX.

By adding this refrigerant additive, the 1g compatibility of the fluorocarbon-based cold tofu of the present invention is improved, the discharge temperature is lowered, and a stable refrigerating capacity can always be obtained.

One of the characteristics of the refrigerant according to the present invention is that the R-1381 fluorocarbon refrigerant and the R-115 fluorocarbon refrigerant that are mixed do not have an azeotropic point, which is different from the common sense of mixing conventional fluorocarbon refrigerants. It's off.

That is, in the case of a wide mixture, the composition of the liquid phase and the gas phase are different at a certain mixing ratio, so when used as a cold tofu, the composition always changes and the refrigerant effect also changes.

Here, the boiling point of R-115 is -45.4°C, R-13
The boiling point of R-1381 is -57.75°C, and the temperatures at both Δ11 points are significantly different, so it is unlikely that R-115 and R-1381 form a mixture with an azeotropic point. Surprisingly, a mixture of both fluorocarbon refrigerants exhibits high thermal stability and refrigeration capacity. R-day 5 fluorocarbon refrigerant is superior to R-13B1 fluorocarbon refrigerant. Preferably, it is mixed in an amount of 10 to 40 wt%, more preferably 10 to 25 wt%. In this range, the thermal stability becomes better fif.

In the present invention, when a polymeric hydrocarbon-based refrigerant-accepting additive is added to the fluorocarbon-based chilled tofu mixture, the properties of the chilled tofu are further improved. This polymeric hydrocarbon additive is compatible with the mixture and does not react with the chlorofluorocarbon-based chilled tofu.

This polymer-hydrocarbon refrigerant additive consists of a mixture of a polymer-hydrocarbon and a special inorganic substance, such as:
Refrigerant additive manufactured by Daiei Yakuhin Co., Ltd. [5DGJ series, product name rSDG-OJ for fully enclosed refrigerators]
, the same rSDG- for semi-closed and open type refrigerators.
An additive called IJ can be used.

This refrigerant additive) is preferably 0.2 to 1. Owt/vol 1% is added. If it is less than 0.2%, there is no effect of addition, and 1. O
If it is mixed in excess of %, the characteristics of cold tofu will be impaired.

By adding this refrigerant additive, the refrigerant is mixed in +1 direction. In other words, if it is a general public N+ and not an E-mixture, if it leaks, what will happen to it? The composition of the refrigerated tofu changes to a composition with less low boiling energy and more high boiling energy compared to the original, but when this refrigerant additive is added, even if it leaks, the composition of the refrigerant remains at the initial mixing ratio.

In addition, in the case of a mixed refrigerant, the liquid phase and gas phase have different compositions,
When used as a refrigerant, the composition always fluctuates and the refrigerant effect also changes, but by adding this refrigerant additive, stable refrigeration ability can always be obtained.

Claims (1)

[Claims] (1.) A fluorocarbon-based refrigerant characterized by a combination of 11 R-138I fluorocarbon refrigerants and R-115 fluorocarbon refrigerant. (2) Feature 1 ('1 In claim 1, R-13
81 CFC refrigerant, R-115 CFC refrigerant is 10~
A fluorocarbon refrigerant containing 404% J1. (3) Mix R-1381 CFC refrigerant and R-115 CFC refrigerant, and add 0.2 to 1
, a fluorocarbon-based refrigerant characterized by adding a polymeric hydrocarbon-based refrigerant additive of 1% owt/vo. (4) In claim 3 of the 45th Amendment, the polymeric hydrocarbon refrigerant additive is a fluorocarbon refrigerant manufactured by Daiei Pharmaceutical Co., Ltd. under the trade name rSDGJ.