摘要:
There is disclosed a lubricating oil for compression-type refrigerators comprising a polyvinyl ether compound which contains a constituting unit represented by the general formula (I), a polyvinyl ether compound which contains constituting units represented by each one of the general formulae (I) and (II), or a mixture of these polyvinyl ether compounds, as the main component thereof. Ratio by mol of carbon to oxygen in the above polyvinyl ether compounds is 4.2 to 7.0. Also disclosed is a lubricating oil for compression-type refrigerators comprising a polyvinyl ether compound containing constituting units which are both represented by the general formula (I) but between which R.sup.5 is different. The lubricating oil for compression-type refrigerators has excellent compatibility with hydrofluorocarbons, such as 1,1,1,2-tetrafluoroethane, and hydrochlorofluorocarbons which can be used as the refrigerant to replace compounds causing environmental pollution such as dichlorodifluoromethane, shows low hygroscopicity, and exhibits superior stability and lubricating property. ##STR1##
摘要:
A lubricating oil for compression-type refrigerators which comprises as the main component thereof a polyvinyl ether compound having excellent compatibility with a hydrofluorocarbon or a hydrochlorofluorocarbon, such as 1,1,1,2-tetrafluoroethane and the like, which can be used as the refrigerant to replace compounds causing environmental pollution, such as dichlorofluoroethane and the like, and having an excellent lubricating property is disclosed. The lubricating oil for compression-type refrigerators comprises as the main component thereof a polyvinyl ether compound having the constituting units expressed by the general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 are H or a hydrocarbon group of C.sub.1.about.8, R.sup.4 is a bivalent hydrocarbon group of C.sub.2.about.10, R.sup.5 is a hydrocarbon group of C.sub.1.about.10 and m is 0.about.10.
摘要:
A method of production of polyvinyl ether compound by which the polyvinyl ether compound having a desired degree of polymerization is produced reliably, safely and efficiently and a novel polyvinyl ether compound useful as lubricating oil for compression-type refrigerators, electric insulation oil and the like are disclosed. The method of production of the present invention is a method of producing a polyvinyl ether compound which comprises polymerizing a vinyl ether compound in the presence of a Lewis acid catalyst and a specific acetal or a method of producing a polyvinyl ether compound which comprises forming an acetal by reaction of a vinyl ether compound with a specific alcohol in the presence of a Lewis acid catalyst, then adding the vinyl ether compound to the acetal and polymerizing the vinyl ether compound. The polyvinyl ether compound of the present invention is homopolymer or a copolymer of an alkyl vinyl ether comprising the constituting unit expressed by the general formula: ##STR1## (R.sup.15 : an alkyl group of C.sub.1 .about.C.sub.3) and having weight average molecular weight of 300 to 1200 and one end having a specific structure.
摘要:
A method of production of an ether compound from an acetal compound or a ketal compound which is excellent in conversion and selectivity and does not cause corrosion of apparatuses and a novel useful polyvinyl ether compound as lubricating oil for compression-type refrigerators, electric insulation oil and the like are disclosed. The method of production of the present invention comprises reaction of an acetal compound or a ketal compound with hydrogen in the presence of a solid catalyst having acidic property and hydrogenation ability to produce the corresponding ether compound.
摘要:
A lubricating oil for compression-type refrigerators which comprises as the main component thereof a polyvinyl ether compound having excellent compatibility with a hydrofluorocarbon or a hydrochlorofluorocarbon, such as 1,1,1,2-tetrafluoroethane and the like, which can be used as the refrigerant to replace compounds causing environmental pollution, such as dichlorofluoroethane and the like, and having an excellent lubricating property is disclosed. The lubricating oil for compression-type refrigerators comprises as the main component thereof a polyvinyl ether compound having the constituting units expressed by the general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 are H or a hydrocarbon group of C.sub.1.about.8, R.sup.4 is a bivalent hydrocarbon group of C.sub.2.about.10, R.sup.5 is a hydrocarbon group of C.sub.1.about.10 and m is 0.about.10.
摘要:
A method of production of an ether compound from an acetal compound or a ketal compound which is excellent in conversion and selectivity and does not cause corrosion of apparatuses and a novel useful polyvinyl ether compound as lubricating oil for compression-type refrigerators, electric insulation oil and the like are disclosed. The method of production of the present invention comprises reaction of an acetal compound or a ketal compound with hydrogen in the presence of a solid catalyst having acidic property and hydrogenation ability to produce the corresponding ether compound. The polyvinyl ether compound of the present invention comprises the constituting unit expressed by the general formula: ##STR1## (characters in the general formula are the same as those described in the specification), contains none of unsaturated bond, acetal structure and aldehyde structure in the molecule and has weight average molecular weight in the range of 300 to 3000.
摘要:
A method of production of an ether compound from an acetal compound or a ketal compound which is excellent in conversion and selectivity and does not cause corrosion of apparatuses and a novel useful polyvinyl ether compound as lubricating oil for compression-type refrigerators, electric insulation oil and the like are disclosed. The method of production of the present invention comprises reaction of an acetal compound or a ketal compound with hydrogen in the presence of a solid catalyst having acidic property and hydrogenation ability to produce the corresponding ether compound. The polyvinyl ether compound of the present invention comprises the constituting unit expressed by the general formula: ##STR1## (characters in the general formula are the same as those described in the specification), contains none of unsaturated bond, acetal structure and aldehyde structure in the molecule and has weight average molecular weight in the range of 300 to 3000.
摘要:
Disclosed is a lubricating oil for compression-type refrigerator comprising, as a main component, a polyoxyalkyleneglycol derivative represented by the general formula: R1&Brketopenst;(OR2&Parenclosest;mOR3]n wherein symbols are as defined in the specification. Said lubricating oil has a favorable compatibility with refrigerants and an excellent lubricating property, and is utilized as the lubricating oil for compression-type refrigerator employing hydrogen-containing fluorocarbon compound refrigerants including R-134a.
摘要:
A polyoxyalkylene glycol derivative which has at least one constitutional unit represented by the general formula: ##STR1## wherein R.sup.1 to R.sup.4 are each hydrogen, a monovalent hydrocarbon group having 1 to 10 carbon atoms or a group represented by the general formula: ##STR2## wherein R.sup.5 and R.sup.6 are each hydrogen, a monovalent hydrocarbon group having 1 to 10 carbon atoms or an alkoxyalkyl group having 2 to 20 carbon atoms, R.sup.7 is an alkylene group having 2 to 5 carbon atoms, a substituted alkylene group having 3 to 5 total carbon atoms with an alkyl group as a substituent, or a substituted alkylene group having 4 to 10 total carbon atoms with an alkoxyalkyl group as a substituent, n' is an integer of 0 to 20 and R.sup.8 is a monovalent hydrocarbon group having 1 to 10 carbon atoms with at least one of R.sup.1 to R.sup.4 being a group represented by the general formula (II).
摘要:
Disclosed is a lubricating oil for compression-type refrigerator comprising, as a main component, a polyoxyalkyleneglycol derivative represented by the general formula: R1[(OR2)mOR3]n wherein symbols are as defined in the specification. Said lubricating oil has a favorable compatibility with refrigerants and an excellent lubricating property, and is utilized as the lubricating oil for compression-type refrigerator employing hydrogen-containing fluorocarbon compound refrigerants including R-134a or fluorocarbon compound refrigerants without hydrogen.