The invention relates to a preparation method of novel silicane
fire retardant. The method includes the following steps of firstly, dissolving
siloxane in
organic solvent with the
siloxane as raw materials, adding a
potassium hydroxide catalyst, and conducting heating
reflux for 15-30 minutes after the mixture is stirred to be uniform so that
sodium complex can be obtained; secondly, adding
phosphorus trichloride for substitution after the
phosphorus trichloride is slightly cooled, conducting
reflux again for 25-40 minutes, and converting the
phosphorus trichloride into phosphorus complex; thirdly, conducting filtering after cooling, cooling filtrate to -5 DEG C after the filtrate is concentrated, and generating white crystals; fourthly, flushing the white crystals obtained in the third step through methyl
alcohol, placing the white crystals in a room-temperature vacuum oven to be dried for 0.6-1.5 hours, and obtaining the silicane
fire retardant. Compared with the prior art, the reaction condition is gentle, the
reaction temperature is moderate, the obtained finished product can be quite easily separated from a
reaction system, the
flame retardant property and the
oxidation resistance can be effectively improved, and meanwhile the
mechanics performance, the insulating performance and the
heat resistance are not influenced.