| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to polymer compositions based on plasticised polyvinyl chloride (PVC) with low flammability, low emission of smoke and hydrogen chloride during combustion, designed for insulating inner and outer casings of wires and cables used in high fire risk conditions. The electrically insulating composition contains the following (pts. wt): suspended polyvinyl chloride 100, ester plasticiser 40-60, lead stabiliser 3-8, epoxy-diane resin or epoxidated soya oil 1-4, calcium carbonate 5-60, trihydrate of aluminium oxide or magnesium hydroxide 30-100, antimony trioxide 5-10, zinc oxide 1-7, zinc borate 0.5-8, additive 1,3,5-tris-(2,3-dibromoisopropyl)-isocyanurate (FR-930) 0.5-10, boric acid 0.1-1.5, diphenylolpropane 0.1-0.5, polyethylene wax 0.1-0.5. The electrically insulating composition also contains an additive 1,3,5-tris-(2,3-dibromoisopropyl)-isocyanurate, magnesium hydroxide, boric acid, epoxy-diane resin or epoxidated soya oil, diphenylolpropane and polyethylene wax. ^ EFFECT: higher degree of non-flammability, low smoke emission level in combustion conditions and increased fluidity of the melt. ^ 1 tbl |
