Aryl substituted organopolysiloxane antifoaming agent and method for manufacturing said antifoaming agent
An antifoaming agent including: (A) an organopolysiloxane having a hydrolysable group shown by the formula (1) on at least one silicon atom of an organopolysiloxane segment constituting a main chain and containing siloxy units shown by the formula (2) at an amount of at least 10 mol % of the total, (B) a non-linear organosilicon resin other than the organopolysiloxane of component (A); and (C) a hydrophobic filler, and a method for manufacturing thereof. (where X represents a divalent hydrocarbon group having 1 to 10 carbon atoms; and R each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms) (where R 1 represents a monovalent hydrocarbon group having 1 to 12 carbon atoms; and R 2 represents an organic group having an aryl group and 6 to 12 carbon atoms, optionally containing an oxygen atom or a halogen atom)
1. An antifoaming agent comprising:
(A) an organopolysiloxane having a hydrolysable group shown by the formula (1) on at least one silicon atom of an organopolysiloxane segment constituting a main chain and containing siloxy units shown by the formula (2) at an amount of at least 10 mol % of the total,
wherein X represents a divalent hydrocarbon group having 1 to 10 carbon atoms; and R each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 4 carbon atoms,
wherein R 1 represents a monovalent hydrocarbon group having 1 to 12 carbon atoms; and R 2 represents an organic group having an aryl group and 6 to 12 carbon atoms, optionally containing an oxygen atom or a halogen atom;
(B) a non-linear organosilicon resin other than the organopolysiloxane of component (A); and
(C) a hydrophobic filler.
2. The antifoaming agent according to claim 1 , wherein the component (A) is an organopolysiloxane shown by the following general formula (3) having a kinematic viscosity of 200 to 50,000 mm 2 /s at 25° C.,
wherein R 1 and R 2 are as described above; R 3 represents the hydrolysable group shown by the formula (1); R 4 is the same as R 1 , or a group selected from the hydrolysable group of formula (1), a hydroxy group and a methoxy group; “n” represents an integer of 5 to 10,000; “m” represents an integer of 1 to 2,000; and “l” represents an integer of 1 to 20.
3. The antifoaming agent according to claim 1 , wherein the component (B) is a siloxane resin comprising: a R 5 3 SiO 1/2 unit, wherein R 5 represents a monovalent hydrocarbon group, a hydrocarbonoxy group, or a hydroxy group, and 10 mol % or more of R 5 is a monovalent hydrocarbon group; and an SiO 2 unit, wherein R 5 3 SiO 1/2 unit/SiO 2 unit=0.4 to 2.5.
4. The antifoaming agent according to claim 2 , wherein the component (B) is a siloxane resin comprising: a R 5 3 SiO 1/2 unit, wherein R 5 represents a monovalent hydrocarbon group, a hydrocarbonoxy group, or a hydroxy group, and 10 mol % or more of R 5 is a monovalent hydrocarbon group; and an SiO 2 unit, wherein R 5 3 SiO 1/2 unit/SiO 2 unit=0.4 to 2.5.
5. The antifoaming agent according to claim 1 , wherein a content of the component (A) is 30 to 90 mass %, a content of the component (B) is 1 to 50 mass %, and a content of the component (C) is 0.5 to 50 mass %.
6. The antifoaming agent according to claim 2 , wherein a content of the component (A) is 30 to 90 mass %, a content of the component (B) is 1 to 50 mass %, and a content of the component (C) is 0.5 to 50 mass %.
7. The antifoaming agent according to claim 3 , wherein a content of the component (A) is 30 to 90 mass %, a content of the component (B) is 1 to 50 mass %, and a content of the component (C) is 0.5 to 50 mass %.
8. The antifoaming agent according to claim 4 , wherein a content of the component (A) is 30 to 90 mass %, a content of the component (B) is 1 to 50 mass %, and a content of the component (C) is 0.5 to 50 mass %.
9. The antifoaming agent according to claim 1 , further comprising 0.5 to 20 mass % of (D) an organic oil.
10. The antifoaming agent according to claim 2 , further comprising 0.5 to 20 mass % of (D) an organic oil.
11. The antifoaming agent according to claim 3 , further comprising 0.5 to 20 mass % of (D) an organic oil.
12. The antifoaming agent according to claim 5 , further comprising 0.5 to 20 mass % of (D) an organic oil.
13. A method for manufacturing an antifoaming agent, comprising a step of performing a heat treatment at a temperature of 50° C. or higher and 200° C. or lower after mixing the components (A) to (C) in the antifoaming agent according to claim 1 .
14. The method for manufacturing an antifoaming agent according to claim 13 , further comprising a step of adding an alkaline substance and mixing before performing the heat treatment.
15. The method for manufacturing an antifoaming agent according to claim 13 , further comprising a step of mixing (D) an organic oil with the components (A) to (C).
16. The method for manufacturing an antifoaming agent according to claim 14 , further comprising a step of mixing (D) an organic oil with the components (A) to (C).