| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to alkylketone fluorotelomers used for making protective heat-resistant coatings. The fluorotelomers have general formula R1(CF2=CF2)n R2, where n ranges from 6 to 20; R1 and R2 are fragments of the alkylketone molecule. Said fluorotelomers are obtained via free-radical telomerisation reaction of unsaturated perfluoro olefins (for example tetrafluoroethylene) in a liquid medium of telogen which is in form of aliphatic ketones, at temperature which ensures kinetic efficiency of the process. The free-radical telomerisation reaction is initiated with ionising radiation, for example gamma-ray quanta of 60Co in molar ratio tetrafluoroethylene/telogen=(0.5-20)/100, or chemical initiators at decomposition temperature of the initiator in molar ratio initiator/tetrafluoroethylene/telogen=0.5/(0.5-20)/100, with subsequent separation of telomers with different chain length n depending on concentration of tetrafluoroethylene. ^ EFFECT: deposition of telomers on a substrate of a different nature, configuration and micro-dimensions with subsequent drying and thermal treatment leads to obtaining coatings with good resistance to chemically aggressive media, heat-resistance, antifriction and water-repellent properties. ^ 4 cl, 13 ex, 3 tbl |
