POLYORGANOSILOXANES AS BASE OF FOAM-EXTINGUISHING COMPOSITIONS AND METHOD OF OBTAINING THEREOF Russian patent published in 2015 - IPC C08G77/06 

FIELD: chemistry.

SUBSTANCE: invention relates to polyorganosiloxanes, which are ultra-branched polymers, containing organosiloxane units, chemically grafted to silicon dioxide particles. Claimed is method of obtaining polyorganosiloxanes of general formula {[R¹O_0.5]_a[(CH₃)₂SiO]_b[R²SiO_1.5]_c[R³SiO_1.5]_d[R⁴O_0.5]_e[SiO₂]}_f, where R¹ is hydrogen, methyl, ethyl, propyl, acetyl; R² is methyl, ethyl, vinyl, octyl, phenyl, ethoxy; R³ is methyl, ethyl, vinyl, octyl, phenyl, ethoxy; ([R⁴O_0.5]_e[SiO₂]) is particle of silicon dioxide, in which R⁴ is Si(CH₃)₃, Si(CH₃)₂O_0.5; f=1000-15000, with a:b:c:d:e=(0.005÷0.06):(10÷800):(0÷11):(0÷8):(0÷0.15), by interaction of some components, selected from: (A) polydiorganosiloxane of formula R¹O[(CH₃)₂SiO]_mR¹, where R¹ is hydrogen, methyl, ethyl, acetyl, m=8-500; (B) acetic acid; (C) organosiloxane of formula R²Si(OR³)₃, where R² is methyl, ethyl, vinyl, oxtyl, phenyl, ethoxy, R³ is methyl, ethyl, propyl; (D) organoacetoxysilane of formula R⁴Si(O(O)CCH₃)₃, where R⁴ is methyl, ethyl, vinyl, octyl, phenyl, ethoxy; (E) silicon pyrogenic ioxide of formula {(SiO₂)(O_0.5R⁵)_e(O_0.5H)_g}_f, where R⁵ is Si(CH₃)₃, Si(CH₃)₂O_0,5, e=0-0.15, g=0.05-0.25, f=1000÷15000, with surface 200-300 m²/g, particle size 5-14 nm; with weight ratio A:B:C:D:E=100:(0÷23):(0÷6.1):(0÷10):(0.1÷7). Process is carried out at 50-130°C for 5-10 hours with following vacuum procession under reduced pressure and temperature 100-130°C to viscosity 30000-3000000 cPs. Polyorganosiloxanes obtained by claimed method are also claimed.

EFFECT: claimed compounds can be applied in absence of catalyst with preservation of molecular structure of initial organosiloxanes and particles of silicon dioxide and can be applied as bases for highly effective foam-extinguishing compositions.

5 cl, 11 ex