Defoamer Active, Manufacturing Method Thereof, and Defoaming Formulation
This invention relates to a defoamer active. The defoamer active may include hydrophobized aluminum silicate particles. Aluminum silicate particles having a surface pH of at least about 9.6 and a BET surface area of less than about 150 m2/g are treated with a hydrophobilizing agent to provide the hydrophobized aluminum silicate particles. The defoamer actives are useful to prepare defoamer compositions which are useful for preventing or reducing foam in various aqueous systems.
1 . A defoamer active, comprising:
hydrophobized aluminum silicate particles comprising aluminum silicate particles having a surface pH of at least about 9.6 and a BET surface area of less than about 150 m 2 /g which have been treated with a hydrophobilizing agent to provide the hydrophobilizing agent on the aluminum silicate particles.
2 . The defoamer active according to claim 1 , wherein the aluminum silicate particles have a median particle size ranging from about 5 μm to about 50 μm.
3 . The defoamer active according to claim 1 , wherein the hydrophobized aluminum silicate particles have a median particle size ranging from about 2 μm to about 15 μm.
4 . The defoamer active formed according to claim 1 , wherein the BET surface area of the aluminum silicate particles is less than about 100 m 2 /g.
5 . (canceled)
6 . The defoamer active according to claim 1 , wherein the surface pH of the aluminum silicate particles is at least about 10.
7 . The defoamer active of claim 1 , wherein the aluminum silicate particles comprise an alkali metal/alkaline earth metal aluminum silicate.
8 . The defoamer active of claim 7 , wherein the alkali metal/alkaline earth metal aluminum silicate contains at least an alkali metal selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, and mixtures thereof.
9 . The defoamer active of claim 7 , wherein the alkali metal/alkaline earth metal aluminum silicate contains at least an alkaline earth metal selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, radium and mixtures thereof.
10 . The defoamer active of claim 7 , wherein the alkali metal/alkaline earth metal aluminum silicate is sodium magnesium aluminum silicate.
11 . The defoamer active according to claim 1 , wherein the hydrophobilizing agent is a silicone compound.
12 . The defoamer active according to claim 11 , wherein the silicone compound is polydimethylsiloxane, wherein the polydimethylsiloxane has an average molar mass of at least about 3,000 Da.
13 . The defoamer active according to claim 12 , wherein the polydimethylsiloxane has an average molar mass of at least about 10,000 Da.
14 . The defoamer active according to claim 12 , wherein the polydimethylsiloxane is a silanol terminated polydimethylsiloxane.
15 . The defoamer active according to claim 14 , wherein the silanol terminated polydimethylsiloxane has a content of hydroxyl group of at least 0.10% by weight.
16 . (canceled)
17 . The defoamer active according to claim 1 , wherein the hydrophobilizing agent is in an amount of not more than 10% by weight based on a total weight of the aluminum silicate particles and the hydrophobilizing agent.
18 . The defoamer active according to claim 1 , wherein a carbon content of the hydrophobized aluminum silicate particles is not more than 3.0%.
19 . The defoamer active according to claim 1 , wherein at least 90% by weight of the hydrophobilizing agent is covalently bonded to the aluminum silicate particles.
20 . (canceled)
21 . The defoamer active according to claim 1 , wherein the hydrophobized aluminum silicate particles have hydrophobicity rating of at least 2, as measured according to a floatability method in a mixture solvent of methanol and water with a volume ratio of 60% to 40%.
22 . (canceled)
23 . A defoaming formulation, comprising the deformer active according to claim 1 .
24 . A coating formulation, comprising the defoaming formulation according to claim 23 .
25 . A method of forming a defoamer active, comprising:
milling and bonding aluminum silicate particles with a hydrophobilizing agent using a spiral jet mill or fluid energy mill to obtain hydrophobized aluminum silicate particles,
wherein a surface pH of the aluminum silicate particles is at least 9.6, a BET surface of the aluminum silicate particles is less than 100 m 2 /g and a median particle size of the aluminum silicate particles ranges from about 2 μm to about 50 μm.
26 . The method of forming a defoamer active according to claim 25 , wherein milling and bonding the aluminum silicate particles with the hydrophobilizing agent using the spiral jet mill or fluid energy mill to obtain the hydrophobized aluminum silicate particles comprises:
adding the aluminum silicate particles and the hydrophobilizing agent into the spiral jet mill; and
milling and heating the aluminum silicate particles and the hydrophobilizing agent in the spiral jet mill to form the hydrophobized aluminum silicate particles.
27 . (canceled)
28 . The method of forming a defoamer active according to claim 26 , wherein the total amount of hydrophobilizing agent is present in the hydrophobized aluminum silicate particles in an amount no greater than 10 wt %, based on the total weight of the hydrophobized aluminum silicate particles.
29 . The method of forming a defoamer active according to claim 26 , wherein the aluminum silicate particles comprise a sodium magnesium aluminum silicate.
30 . (canceled)
31 . The method of forming a defoamer active according to claim 26 , wherein the hydrophobilizing agent is polydimethylsiloxane, wherein the polydimethylsiloxane has an average molar mass of at least 3000 Da.
32 . The method of forming a defoamer active according to claim 31 , wherein the polydimethylsiloxane is a silanol terminated polydimethylsiloxane.
33 - 36 . (canceled)