Defoamer compositions for detergents

Patent metadata

Field	Value
Publication number	US-10870732-B2
Application number	US-201716081789-A
Country	US
Kind code	B2
Filing date	Feb 21, 2017
Priority date	Mar 1, 2016
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

Defoamer preparations contain a polyorganosiloxane having aryl groups bonded to silicon at a ring carbon, filler particles and/or silicone resin particles, and a polyoxyalkylene polyether containing oxypropylene moieties. In addition to being efficient and compatible, the defoamer compositions retain their efficiency, especially in liquid detergents, after storage.

First claim

The invention claimed is:

1. A defoamer preparation, comprising
(A) a defoamer composition, comprising
(a1) at least one organosilicon compound comprising units of the formula
R a (R 1 O) b R 2 c SiO (4-a-b-c)/2   (I)

in which
R is the same or different and is hydrogen or a monovalent, SiC-bonded, optionally substituted, aliphatic hydrocarbyl radical, or aromatic hydrocarbyl radical bonded to silicon via aliphatic groups,
R 1 is the same or different and is hydrogen or a monovalent, optionally substituted hydrocarbyl radical,
R 2 is the same or different and is a monovalent, optionally substituted, aromatic hydrocarbyl radical bonded to silicon via a ring carbon atom,
a is 0, 1, 2 or 3,
b is 0, 1, 2 or 3 and
c is 0, 1, 2 or 3,
with the proviso that the sum total of a+b+c is not more than 3 and, in 1-100% of all units of the formula (I), c is different than 0 and, in at least 50% of all units of the formula (I), the sum total of a+b+c in the organosilicon compound is 2,
(a2) at least one additive selected from (a21) filler particles and/or (a22) organopolysiloxane resin(s) comprising units of the formula
R 3 d (R 4 O) e SiO (4-d-e)/2   (II)

in which
R 3 is the same or different and is hydrogen or a monovalent, optionally substituted, SiC-bonded hydrocarbyl radical,
R 4 is the same or different and is hydrogen or a monovalent, optionally substituted hydrocarbyl radical,
d is 0, 1, 2 or 3 and
e is 0, 1, 2 or 3,
with the proviso that the sum total of d+e is not more than 3 and, in less than 50% of all units of the formula (II), the sum total of d+e in the organopolysiloxane resin is 2,
and optionally
(a3) an organosilicon compound comprising units of the formula
R 5 g (R 6 O) h SiO (4-g-h)/2   (III)

in which
R 5 is the same or different and has the definition specified for R,
R 6 is the same or different and has the definition specified for R′,
g is 0, 1, 2 or 3 and
h is 0, 1, 2 or 3,
with the proviso that the sum total of g+h is not more than 3 and, in at least 50% of all units of the formula (III), the sum total of g+h in the organosilicon compound is 2,
(B) polypropylene glycols, terminally etherified or esterified polypropylene glycols, polypropylene glycol/polyethylene glycol copolymers, terminally etherified or esterified polypropylene glycol/polyethylene glycol copolymers, and mixtures thereof,
(C) optionally, polyether-modified siloxanes,
(D) optionally, organic compounds, and
(F) optionally, further additives.

2. The defoamer preparation of claim 1 , wherein R is a monovalent aliphatic hydrocarbyl radical having 1 to 4 carbon atoms, and R 2 is an aryl radical.

3. The defoamer preparation of claim 1 , wherein R is methyl and R 2 is phenyl.

4. The defoamer preparation of claim 1 , wherein 10 to 100 mol % of the SiC-bonded radicals in component (a1) are R 2 radicals.

5. The defoamer preparation of claim 2 , wherein 10 to 100 mol % of the SiC-bonded radicals in component (a1) are R 2 radicals.

6. The defoamer preparation of claim 1 , wherein water is additionally present in amounts of not more than 5% by weight, based in each case on the total weight of the defoamer preparation.

7. The defoamer preparation of claim 1 , wherein water is additionally present in amounts of not more than 1% by weight, based in each case on the total weight of the defoamer preparation.

8. The defoamer preparation of claim 1 , wherein no additional water is present.

9. The defoamer preparation of claim 1 , wherein component (a22) comprises organopolysiloxane resins consisting essentially of R 3 3 SiO 1/2 (M) and SiO 4/2 (Q) units, and the molar ratio of M to Q units is in the range of from 0.5 to 2.0 and up to 10% by weight of Si-bonded hydroxy or alkoxy groups are optionally present.

10. The defoamer preparation of claim 1 , wherein component (a21) comprises silicas having a BET surface area of 50 to 800 m 2 /g.

11. The defoamer preparation of claim 1 , wherein component (B) comprises at least one polyoxyalkylene of the formula
R 7 —[O—CH 2 —CH(CH 3 )] x —[O—CH 2 —CH 2 ] y —O—R 7   (IV)

in which R 7 is the same or different and is hydrogen, a C 1 -C 30 -alkyl radical, a C 1 -C 30 -alkenyl radical or a radical of the formula R 8 —C(O)— (V),
R 8 is a C 1 -C 22 -alkyl radical,
x has a value of 6 to 300 and
y has a value of 0 to 30
and the ratio y/x is 0 to 1.

12. The defoamer preparation of claim 1 , comprising:
10% to 90% by weight of defoamer composition (A)
10% to 90% by weight of (B)
0 to 10% by weight of polyether-modified siloxanes (C)
0% to 20% by weight of organic compounds (D)
0 to 1% by weight of water (E), and
0% to 10% by weight of further additives (F)

based in each case on the total weight of the defoamer composition.

13. A surfactant formulation comprising a defoamer preparation of claim 1 .

14. The surfactant formulation of claim 13 , which is a wetting agent, washing composition, or cleaning composition.

15. A method of defoaming and/or preventing foaming of a medium comprising mixing at least one defoamer preparation of claim 1 with the medium.

16. The method of claim 15 , wherein the medium is an aqueous medium.

17. The method of claim 15 , wherein the defoamer composition is added to the medium in amounts of 0.1 ppm by weight to 1% by weight.

18. The defoamer preparation of claim 1 , wherein component (B) has a solubility in water of less than 2% by weight at 25° C. and 1013 hPa.

Assignees

• Wacker Chemie Ag

Inventors

• Rautschek Holger
• Becker Richard
• Brehm Christof

Classifications

• C11D3/378

  (Co)polymerised monomers containing sulfur, e.g. sulfonate · CPC title

• C11D3/3707

  Polyethers, e.g. polyalkyleneoxides · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08G77/16

  to hydroxy groups · CPC title

• C11D3/162

  containing Si · CPC title