Defoaming formulations containing organopolysiloxanes

A defoamer formulation, comprising:

• (1) organopolysiloxane(s) containing per molecule
• at least one structural unit of formula
• O1/2R2Si—Y—SiRO2/2 (I)
• and at least 2 units of formula
• R1R2SiO1/2 (II)
• and units of formula
• R2SiO2/2 (III),
• wherein
• R each is identical or different and represents a monovalent SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms which optionally contains one or more nonadjacent oxygen atoms and which is free from aliphatic carbon-carbon multiple bonds, and
• R1 is R or an alkenyl radical having 2 to 30 carbon atoms, wherein at least one alkenyl radical per molecule is present,
• Y is a divalent hydrocarbon radical having 2 to 30 carbon atoms, with the proviso that the organopolysiloxane contains a structural element of formula
• R2Y2SiO—(SiR2O)x1—SiRY1O—(SiR2O)x2—SiR2R1 (IV),
• wherein
• R and R1 are as defined above,
• Y1 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiR2O1/2,
• Y2 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiRO2/2, and
• x1 and x2 are 0 or an integer,
• with the proviso that the sum of x1+x2 is x,
• wherein x is on average more than 5, and less than 100,
• (2) fillers,
• (3) organopolysiloxane resin(s) composed of units of formula
• R2e(R3O)fSiO(4-e-f)/2 (V),
• wherein
• R2 each is identical or different and represents a hydrogen atom or a monovalent, optionally substituted, SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms,
• R3 each is identical or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbon radical having 1 to 4 carbon atoms,
• e is 0, 1, 2, or 3 and
• f is 0, 1, 2, or 3,
• with the proviso that the sum of e+f is not more than 3 and that the sum of e+f is 2 in less than 50% of all units of formula (V) in the organopolysiloxane resin,
• (4) polyethylene oxide-derived surfactants, and
• (5) inorganic or organic acids.