| 摘要 |
FIELD: construction. ^ SUBSTANCE: invention may be used to make protection elements in various equipment used for flaw detection, for medical purposes, for radioactive logging of oil and gas wells, in portable neutron generators, etc. Method includes polymerisation of ethylene on surface of elementary boron particles with average size of 3-8 mcm in presence of catalytic system immobilised on them, which consists of vanadium tetrachloride and aluminium-organic compound. First ethylene is pre-polymerised on surface of boron particles at 25-30 C and ethylene pressure of 1 at for 8-10 minutes, then temperature is increased up to 50-60C, and ethylene polymerisation is continued at 50-60C and pressure in the range from 1 to 10 at to produce layer of ultrahigh molecular polyethylene on them with molecular weight of at least 1106 and thickness of 0.01-20 mcm. Radiation-protection composite material represents particles of elementary boron with polyolefin layer in the form of agglomerates of average size of 20-100 mcm. ^ EFFECT: produced composite material has even distribution of boron particles in polymer matrix, high strength, very high impact viscosity in wide range of temperatures, resistance to cracking and abrasion. ^ 4 cl, 6 ex |
