Solution comprising propyl-functional alkali siliconates, silicates and method of production thereof

The method of preparing an alcohol-free solution comprising a propyl-functional alkali siliconate, a silicate and optionally a co-condensation product of a propyl-functional alkali siliconate with a silicate, the method comprising:

• 1) preparing a mixture comprising a propyl-functional silane a halosilane and alcohol by reacting the propyl-functional silane, halosilane, alcohol and optionally water
• 2) introducing the mixture in the presence of inert gas into an aqueous alkaline hydroxide solution, wherein the inert gas is supplied in a process so that the mixture is introduced a little at a time directly into the aqueous alkaline hydroxide solution, and
• 3) removing the alcohol and/or hydrolysis alcohol,
• wherein the propyl-functional silane is represented by formula I:
• (R1)xSiHal(y-x) (I),
• wherein R1 is independently a propyl-functional residue;
• hydrolysable residue Hal is independently chlorine or bromine;
• x is 1 or 2;
• and
• y is 4, and
• the halosilane is represented by formula II:
• Si(Hal)4 (II),
• wherein hydrolysable residue Hal is independently chlorine or bromine.