CN110960892A - Efficient water-based paint defoaming agent and preparation method thereof - Google Patents
Efficient water-based paint defoaming agent and preparation method thereof Download PDFInfo
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- CN110960892A CN110960892A CN201911205285.1A CN201911205285A CN110960892A CN 110960892 A CN110960892 A CN 110960892A CN 201911205285 A CN201911205285 A CN 201911205285A CN 110960892 A CN110960892 A CN 110960892A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
Abstract
The invention discloses a high-efficiency water-based paint defoamer and a preparation method thereof, wherein the defoamer comprises the following raw materials, by weight, 5-20 parts of polyether modified polysiloxane; 10-20 parts of hydrocarbonized oil; 1-5 parts of silicon dioxide; 2-5 parts of MQ silicon resin; 1-2 parts of fatty acid; 1-2 parts of a coupling agent; 2-5 parts of an emulsifier; 1-4 parts of a thickening agent; 50-80 parts of water, wherein the high-efficiency water-based paint defoamer prepared by the invention is a polyether modified polysiloxane copolymer, the components of the defoamer contain silicon dioxide, and the defoamer is high in capability of eliminating tiny bubbles in a high-viscosity system, suitable for transparent water-based paint, strong in defoaming and foam inhibiting capability, and suitable for a polyurethane and acrylic adhesive system. Solves the problems of slow defoaming speed and short foam inhibition time of most defoaming agents in a high-viscosity system.
Description
Technical Field
The invention relates to the field of defoaming agents, in particular to a high-efficiency water-based paint defoaming agent and a preparation method thereof.
Background
The defoaming agent, also known as an antifoaming agent, can generate a plurality of harmful foams in the industrial production process, needs to be added with defoaming, and is widely applied to removing the harmful foams generated in the production processes of industries such as latex, textile sizing, food fermentation, biomedicine, coating, petrochemical industry, paper making, industrial cleaning and the like. Generally, foams are coarse dispersions of gas in liquid, belonging to gas-liquid heterogeneous systems, gas-liquid dispersions with bulk densities close to that of gas but not close to that of liquid. When the liquid does not contain the surfactant, the bubbles can migrate to the surface of the liquid and break and disappear; when the liquid contains a surfactant, the surface of the bubbles forms a film sheet, and the foam becomes stable. The conventional defoaming agent compositions have a problem that sufficient defoaming property cannot be obtained. Particularly, in the emulsion type coating, the defoaming property is poor, and the problems of foam breaking prevention and foam inhibition are difficult to solve.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-efficiency water-based paint defoamer and a preparation method thereof, the high-efficiency water-based paint defoamer prepared by the invention is a polyether modified polysiloxane copolymer, contains a silicon dioxide component, has strong capability of eliminating micro bubbles in a high-viscosity system, is suitable for transparent water-based paint, has strong defoaming and foam inhibiting capabilities, is suitable for polyurethane and acrylic acid adhesive systems, belongs to an emulsion type defoamer, has self-dispersion performance, and is convenient to use; solves the problems of slow defoaming speed and short foam inhibition time of most defoaming agents in a high-viscosity system.
In order to achieve the purpose, the invention provides the following technical scheme: the efficient water-based paint defoaming agent comprises the following raw materials, by weight, 5-20 parts of polyether modified polysiloxane; 10-20 parts of hydrocarbonized oil; 1-5 parts of silicon dioxide; 2-5 parts of MQ silicon resin; 1-2 parts of fatty acid; 1-2 parts of a coupling agent; 2-5 parts of an emulsifier; 1-4 parts of a thickening agent; 50-80 parts of water.
Preferably, the structural general formula of the polyether modified polysiloxane is MDa(MeYSio)bM; wherein M is linked to R3Sio1/2D is a link R2SiO2/2R is the same or different and is a hydrogen atom or a hydrocarbyl group with 1-20 carbon atoms, and Me is a methyl group; y has a structural formula of- (CH2)xO(EO)z(PO)gK, K is a capping group, is hydrogen atom, methyl, ethyl, propyl, a is an integer of 10 to 500,b is a polymerization degree of 1 to 50, x is an integer of 2 to 6, z is an integer of 1 to 40, and g is an integer of 0 to 30.
Preferably, the hydrocarbonated oil is a paraffin oil.
Preferably, the silicon dioxide is hydrophobic fumed silica.
Preferably, the ratio of n (M)/n (Q) of the MQ silicone resin is 0.6-1.0.
Preferably, the fatty acid is one or more of palmitic acid, oleic acid and stearic acid.
Preferably, the coupling agent is a titanate coupling agent, wherein the coupling agent can be effectively combined with MQ resin and silicon dioxide, so that the MQ resin and the silicon dioxide can quickly permeate into the surface of the foam film, and the thickness of the foam film is reduced, so that effective defoaming components can be quickly defoamed; the emulsifier is one or more of sorbitan monostearate, sorbitan oleate, polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monooleate, and the thickener is one or more of hydroxypropyl methylcellulose, carboxymethyl cellulose, sodium polyacrylate and the like.
The invention also provides a preparation method of the efficient water-based paint defoaming agent, which comprises the following steps:
step (1): putting polyether modified polysiloxane, hydrocarbonated oil, silicon dioxide, MQ silicon resin, fatty acid, a coupling agent and an emulsifier into a heating tank according to a proportion, heating to 100-150 ℃, keeping the temperature, stirring for 1-3 hours, and then cooling to 70-80 ℃ to obtain an oil phase mixture;
step (2): dissolving a thickening agent in water at 50-60 ℃, adding a 10% sodium hydroxide aqueous solution to adjust the pH to 7 to obtain thickening water, slowly adding the thickening water into the oil phase mixture, emulsifying and stirring at 70-80 ℃ for 1-2 hours, and cooling to room temperature to obtain a coarse emulsion; and homogenizing the crude emulsion for 0.5-1 h to obtain the defoaming agent.
Compared with the prior art, the invention has the following beneficial effects:
1. the high-efficiency water-based paint defoamer prepared by the invention is a polyether modified polysiloxane copolymer, contains a silicon dioxide component, has strong capability of eliminating micro bubbles in a high-viscosity system, is suitable for transparent water-based paint, has strong defoaming and foam inhibiting capabilities, is suitable for polyurethane and acrylic acid adhesive systems, belongs to an emulsion type defoamer, has self-dispersion performance, and is convenient to use. Solves the problems of slow defoaming speed and short foam inhibition time of most defoaming agents in a high-viscosity system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a high-efficiency water-based paint defoamer, which comprises the following raw materials in parts by weight,
5-20 parts of polyether modified polysiloxane; 10-20 parts of hydrocarbonized oil; 1-5 parts of silicon dioxide; 2-5 parts of MQ silicon resin; 1-2 parts of fatty acid; 1-2 parts of a coupling agent; 2-5 parts of an emulsifier; 1-4 parts of a thickening agent; 50-80 parts of water.
Wherein the structural general formula of the polyether modified polysiloxane is MDa(MeYSio)bM, M linked to R3Sio1/2D is a link R2SIO2/2R is the same or different and is a hydrogen atom or a hydrocarbyl group with 1-20 carbon atoms, and Me is a methyl group; y has a structural formula of- (CH)2)xO(EO)z(PO)gK and K are end capping groups, such as hydrogen atoms, methyl, ethyl, propyl and the like, a is an integer of 10-500, b is a polymerization degree of 1-50, x is an integer of 2-6, z is an integer of 1-40, and g is an integer of 0-30.
Example 1, a preparation method of a high-efficiency water-based paint defoamer, adding 20g of polyether modified polysiloxane, 18g of paraffin oil, 2g of white carbon black, 3g of MQ silicon resin with n (m)/n (q) being 0.6, 2g of stearic acid, 1g of titanate coupling agent, span 60 and tween 60 each 2g into a reaction kettle, heating to 130 ℃, stirring for 2 hours under heat preservation, and then cooling to 70 ℃ to obtain an oil phase mixture; adding 2g of thickener polyacrylic acid into 150g of water, and adjusting the pH to 6.5-7 by using a 10% sodium hydroxide aqueous solution to obtain thickening water; slowly adding the thickening water into the oil phase mixture, finishing adding for 1.5-2 h, and then cooling to room temperature to obtain a coarse emulsion; and (3) grinding the crude emulsion for half an hour by using a colloid mill to obtain the efficient water-based paint defoamer.
Example 2, a preparation method of a high-efficiency water-based paint defoamer, adding 20g of polyether modified polysiloxane, 18g of paraffin oil, 2g of white carbon black, 3g of MQ silicon resin with n (m)/n (q) being 0.7, 2g of stearic acid, 1g of titanate coupling agent, span 60 and tween 60 each 2g into a reaction kettle, heating to 130 ℃, stirring for 2 hours under heat preservation, and then cooling to 70 ℃ to obtain an oil phase mixture; adding 2g of thickener polyacrylic acid into 150g of water, and adjusting the pH to 6.5-7 by using a 10% sodium hydroxide aqueous solution to obtain thickening water; slowly adding the thickening water into the oil phase mixture, finishing adding for 1.5-2 h, and then cooling to room temperature to obtain a coarse emulsion; and (3) grinding the crude emulsion for half an hour by using a colloid mill to obtain the efficient water-based paint defoamer.
Example 3, a preparation method of a high efficiency water-based paint defoamer, adding 20g of polyether modified polysiloxane, 18g of paraffin oil, 2g of white carbon black, 3g of MQ silicon resin with n (m)/n (q) of 0.75, 2g of stearic acid, 1g of titanate coupling agent, span 60 and tween 60 each 2g into a reaction kettle, heating to 130 ℃, stirring for 2 hours under heat preservation, and then cooling to 70 ℃ to obtain an oil phase mixture; adding 2g of thickener polyacrylic acid into 150g of water, and adjusting the pH to 6.5-7 by using a 10% sodium hydroxide aqueous solution to obtain thickening water; slowly adding the thickening water into the oil phase mixture, finishing adding for 1.5-2 h, and then cooling to room temperature to obtain a coarse emulsion; and (3) grinding the crude emulsion for half an hour by using a colloid mill to obtain the efficient water-based paint defoamer.
Example 4, a preparation method of a high-efficiency water-based paint defoamer, adding 20g of polyether modified polysiloxane, 18g of paraffin oil, 2g of white carbon black, 3g of MQ silicone resin with n (m)/n (q) being 0.8, 1g of palmitic acid, 1g of stearic acid, 1g of titanate coupling agent, 2g of span 60 and tween 60 into a reaction kettle, heating to 130 ℃, stirring for 2 hours with heat preservation, and then cooling to 70 ℃ to obtain an oil phase mixture; adding 2g of thickener polyacrylic acid into 150g of water, and adjusting the pH to 6.5-7 by using a 10% sodium hydroxide aqueous solution to obtain thickening water; slowly adding the thickening water into the oil phase mixture, finishing adding for 1.5-2 h, and then cooling to room temperature to obtain a coarse emulsion; and (3) grinding the crude emulsion for half an hour by using a colloid mill to obtain the efficient water-based paint defoamer.
Example 5, a preparation method of a high efficiency water-based paint defoamer, adding 20g of polyether modified polysiloxane, 18g of paraffin oil, 2g of white carbon black, 3g of MQ silicone resin with n (m)/n (q) of 0.9, 1g of palmitic acid, 1g of stearic acid, 1g of titanate coupling agent, 2g of span 60 and tween 60 into a reaction kettle, heating to 130 ℃, stirring for 2 hours with heat preservation, and then cooling to 70 ℃ to obtain an oil phase mixture; adding 2g of thickener polyacrylic acid into 150g of water, and adjusting the pH to 6.5-7 by using a 10% sodium hydroxide aqueous solution to obtain thickening water; slowly adding the thickening water into the oil phase mixture, finishing adding for 1.5-2 h, and then cooling to room temperature to obtain a coarse emulsion; and (3) grinding the crude emulsion for half an hour by using a colloid mill to obtain the efficient water-based paint defoamer.
Comparative example 1
Commercially available antifoam agents.
The defoaming agents prepared in examples 1 to 5 were subjected to a performance test, the foaming solution was a polyurethane emulsion, 200ml of the above foaming solution was added to a 500ml measuring cylinder, air was blown in through an air pump to raise the height of foam to a 500ml scale, and then blowing was stopped, 0.2ml of the defoaming agents prepared in examples 1 to 5 was added, and compared with comparative example 1 of a commercially available defoaming agent, the defoaming time (see the liquid level time) of each defoaming agent was recorded, then blowing was performed again, and the rise of foam after defoaming (up to a 500ml scale) was recorded, and the experimental results are shown in table 1.
TABLE 1 antifoam Performance test results
Referring to table 1, the high-efficiency water-based paint defoamer prepared by the invention is a polyether modified polysiloxane copolymer, contains a silicon dioxide component, is high in capability of eliminating micro bubbles in a high-viscosity system, is suitable for transparent water-based paint, has strong defoaming and foam inhibiting capabilities, is suitable for polyurethane and acrylic adhesive systems, belongs to an emulsion type defoamer, has self-dispersion performance, and is convenient to use. Solves the problems of slow defoaming speed and short foam inhibition time of most defoaming agents in a high-viscosity system.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. The efficient water-based paint defoaming agent is characterized by comprising the following raw materials in parts by weight,
5-20 parts of polyether modified polysiloxane; 10-20 parts of hydrocarbonized oil; 1-5 parts of silicon dioxide; 2-5 parts of MQ silicon resin; 1-2 parts of fatty acid; 1-2 parts of a coupling agent; 2-5 parts of an emulsifier; 1-4 parts of a thickening agent; 50-80 parts of water.
2. The efficient water-based paint defoamer as claimed in claim 1, wherein the structural general formula of the polyether modified polysiloxane is MDa(MeYSio)bM; wherein M is linked to R3Sio1/2D is a link R2SIO2/2R is the same or different and is a hydrogen atom or a hydrocarbyl group with 1-20 carbon atoms, and Me is a methyl group; y has a structural formula of- (CH2)xO(EO)z(PO)gK, K is a terminal group, is hydrogen atom, methyl, ethyl, propyl, a is an integer of 10 to 500, b is a polymerization of 1 to 50And (c), x is an integer of 2-6, z is an integer of 1-40, and g is an integer of 0-30.
3. The efficient water-based paint defoamer as claimed in claim 2, wherein said hydrocarbonated oil is paraffin oil.
4. The efficient water-based paint defoamer as claimed in claim 1, wherein said silica is hydrophobic fumed silica.
5. The efficient water-based paint defoamer as claimed in claim 1, wherein the ratio of n (M)/n (Q) of said MQ silicone resin is 0.6-1.0.
6. The efficient water-based paint defoamer as claimed in claim 1, wherein said fatty acid is one or more of palmitic acid, oleic acid and stearic acid.
7. The efficient water-based paint defoamer as claimed in claim 1, wherein the coupling agent is titanate coupling agent, the emulsifier is one or more of sorbitan monostearate, sorbitan oleate, polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monooleate, and the thickener is one or more of hydroxypropyl methylcellulose, carboxymethyl cellulose, sodium polyacrylate and the like.
8. The preparation method of the efficient water-based paint defoaming agent is characterized by comprising the following steps:
step (1): putting polyether modified polysiloxane, hydrocarbonated oil, silicon dioxide, MQ silicon resin, fatty acid, a coupling agent and an emulsifier into a heating tank according to a proportion, heating to 100-150 ℃, keeping the temperature, stirring for 1-3 hours, and then cooling to 70-80 ℃ to obtain an oil phase mixture;
step (2): dissolving a thickening agent in water at 50-60 ℃, adding a 10% sodium hydroxide aqueous solution to adjust the pH to 7 to obtain thickening water, slowly adding the thickening water into the oil phase mixture, emulsifying and stirring at 70-80 ℃ for 1-2 hours, and cooling to room temperature to obtain a coarse emulsion; and homogenizing the crude emulsion for 0.5-1 h to obtain the defoaming agent.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111437632A (en) * | 2020-04-17 | 2020-07-24 | 五色石新材料(杭州)有限公司 | Method for preparing emulsion type defoaming agent by utilizing polyether modified silicone oil |
| CN112742073A (en) * | 2021-01-03 | 2021-05-04 | 朱生寿 | Modified tung linoleic acid polyether ester coating defoaming agent and preparation method thereof |
| CN113350835A (en) * | 2021-06-11 | 2021-09-07 | 江苏赛欧信越消泡剂有限公司 | Modified polyether type defoaming agent for landfill leachate and preparation method thereof |
| CN115926523A (en) * | 2022-11-22 | 2023-04-07 | 湖北隆胜四海新材料股份有限公司 | Defoaming agent for water-based paint and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1919936A (en) * | 2006-08-31 | 2007-02-28 | 南京四新科技应用研究所有限公司 | Organosilicon defoaming agent for water-based system and preparation method thereof |
| CN102051821A (en) * | 2009-10-30 | 2011-05-11 | 成都海旺科技有限责任公司 | Method for preparing textile sizing defoaming agent |
| CN106215467A (en) * | 2016-08-27 | 2016-12-14 | 合肥普庆新材料科技有限公司 | A kind of organic silicon defoamer |
-
2019
- 2019-11-29 CN CN201911205285.1A patent/CN110960892A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1919936A (en) * | 2006-08-31 | 2007-02-28 | 南京四新科技应用研究所有限公司 | Organosilicon defoaming agent for water-based system and preparation method thereof |
| CN102051821A (en) * | 2009-10-30 | 2011-05-11 | 成都海旺科技有限责任公司 | Method for preparing textile sizing defoaming agent |
| CN106215467A (en) * | 2016-08-27 | 2016-12-14 | 合肥普庆新材料科技有限公司 | A kind of organic silicon defoamer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111437632A (en) * | 2020-04-17 | 2020-07-24 | 五色石新材料(杭州)有限公司 | Method for preparing emulsion type defoaming agent by utilizing polyether modified silicone oil |
| CN112742073A (en) * | 2021-01-03 | 2021-05-04 | 朱生寿 | Modified tung linoleic acid polyether ester coating defoaming agent and preparation method thereof |
| CN112742073B (en) * | 2021-01-03 | 2022-07-26 | 山东峰泉新材料有限公司 | Modified tung linoleic acid polyether ester coating defoaming agent and preparation method thereof |
| CN113350835A (en) * | 2021-06-11 | 2021-09-07 | 江苏赛欧信越消泡剂有限公司 | Modified polyether type defoaming agent for landfill leachate and preparation method thereof |
| CN115926523A (en) * | 2022-11-22 | 2023-04-07 | 湖北隆胜四海新材料股份有限公司 | Defoaming agent for water-based paint and preparation method and application thereof |
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