Method for obtaining foamed organosilicon compositions

Foamed organosilicon compositions, prepared by mixing of organosiloxane rubber, organosilicon joining agent and modifier, wherein said organosiiloxane rubber is represented by polyorganosiloxane block co-polymers having general formula as follows:

• {[R1SiO1,5]a[R2(OH)SiO]b, [R3R4SiO]c}n,
• having respective OH groups content from 0.2% to 4.0 mass % and mol. % ratio of R3R4SiO units to R1SiO1,5 falling within the range 0.850-10,000, correspondingly, where:
• R1, R2, R3, R4 are aliphatic radicals having from 1 to 6 carbon atoms;
• phenyl, n is an integer from 30 to 360;
• c=1;
• a=0.019-3.760;
• b=0.008-0.240 or mixture of the above block-copolymer with the α, ω-dihydroxypolydiorganosiloxane of viscosity at 20° C. from 24 P up to 160 P in the ratio of mass parts as (0.05-0.5):1, respectively;
• while the polyorganohydridesiloxanes act as an organosilicon joining agent, having general formula as follows:
• R35SiO[R6(H)SiO]m—[R25SiO]nSiR35,
• having the contents of SiH groups falling within the range of (0.35-1.80) mass %;
• molecular mass limited by 50-200, where:
• R5, R6 is the alkyl radical having from 1 to 6 carbon atoms;
• m is an integer from 1 to 20, n is an integer from 0 to 19;
• m÷n=20, or at least one substance from the compositions having general formula as follows:
• R7SiX3, where:
• R7=alkyl radical having from 1 to 6 carbon atoms,
• CH2═CH—, X:—ON═C(CH3)2, —OC(O)—CH3,
• and organosilicon amines are used as a modifier, having general formula as follows:
• R8R9N—(CH2)n—Si(OR10)3, where
• R8═R9═H—, CH3—, C2H5—, R10═—CH3—, C2H5—, n is an integer from 0 to 3 or mixture of sodium bicarbonate with zinc oxide, or non-organic compound of cobalt with 34 mass % cobalt content, with the proviso of mass fraction ratio of mixed components as follows:
• organosiloxane rubber:
• 100 organosilicon joining agent:
• 2-15 modifier:
• 2-22.