| 摘要 |
FIELD: chemistry.SUBSTANCE: in method of obtaining porous heat-insulating material, which includes mixing one of components of expandable polyurethane with filling agent and further introduction into mixture of other component - polyisocyanate, as filling agent used is sawdust with dimensions 4±2 mm, which is preliminarily subjected to vapour processing at temperature, equal 250°C, after processing sawdust is supplied into diffuser of diffusor-confusor device, with supply into zone of transfer of diffuser into confusor of expandable polyurethane component, which includes polyether, based on propylene oxide, oxypropylethylenediamine, dimethylethanolamine, oxyalkylenemethylsiloxane block-copolymer, trichloroethylphosphate; then, obtained mixture is discharged into reactor, where mixture is mixed and vacuumed to residual pressure, equal 15-20 kPa, after which polyisocyanate is introduced into mixture with ratio of all mixture components, wt %: polyether based on propylene oxide 24.54-26.89, oxypropylethylenediamine 8.40-9.20, dimethylethanolamine 0.48-0.55, oxyalkylenemethylsiloxane block-copolymer 0.36-0.40, trichloroethylphosphate 6.80-7.47, polyisocyanate 33.33-35.56, sawdust 20-25, after mixing components, composite mass is supplied into heated to temperature 50-60°C mould and kept for 15-20 min.EFFECT: obtaining heat-insulating material with lower density and heat-conductivity.1 dwg, 2 tbl, 12 ex |
