Coolant of providing ultra-low temperature

一种包含选自R-23、R-116及其混合物的一种成分和选自丙烷、丁烷及其混合物之一的混合制冷剂。所述混合制冷剂使用传统制冷器的压缩机，可以把制冷器内部冷却到超低温，特别地，冷却到-60℃或更低的温度。所述混合制冷剂不仅具有类似于R-23和R-116的低沸点，而且由于其中含有丙烷和丁烷，可以在室温环境中液化，并且还与润滑油等具有良好的混溶性，使得使用所述制冷剂的制冷装置没有堵塞的问题。另外，所述混合制冷剂没有消耗臭氧的能力，并且温室效应明显很低。通过在室温环境中的压缩机实用能力范围内的压力可以液化所述制冷剂，并且通过使用一种气体和一个压缩机的制冷装置，可以在制冷器内部容易地获得-60℃或更低的温度。 A mixed refrigerant comprising one member selected from R-23, R-116 and a mixture thereof and one member selected from propane, butane and a mixture thereof. The mixed refrigerant allows cooling the inside of a freezer to a super low temperature, particularly to a temperature of -60 DEG C or lower, with a compressor of a conventional freezer. The mixed refrigerant not only has a low boiling point similar to those of R-23 and R-116, but also can be liquefied in a room temperature surrounding due to propane or butane contained therein, and further has good miscibility with a lubricating oil or the like so that a freezer unit using the refrigerant is free from the problem of clogging therein. Additionally, the mixed refrigerant has no ability to deplete ozone and is significantly low with respect to greenhouse effect. The refrigerant can be liquefied by a pressure within the range of practical ability of a compressor in a room temperature surrounding and allows achieving with ease a temperature inside a freezer of -60 DEG C or lower by means of a freezer unit using one gas and one compressor.