Dispersed antifoam agent

Abstract

To provide a defoaming agent capable of exhibiting excellent defoaming properties (foam breaking and foam suppressing effects) and excellent surface finishing properties (cissing and foam breaking marks).SOLUTION: And at least one hydrophobic substance (C) selected from the group consisting of hydrophobic silica, fatty acid metal salts, fatty acid amides, and waxes, wherein the content of the liquid glycerin fatty acid ester (A) is 4 to 49% by weight, the content of the liquid alkylene oxide adduct (B) is 51 to 96% by weight, and the content of the hydrophobic substance (C) is 0.1 to 15% by weight, based on the weight of the liquid glycerin fatty acid ester (A) and the liquid alkylene oxide adduct (B).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a dispersible defoamer. [Background technology]

[0002] "An antifoaming agent composition characterized by comprising, as essential components, 40 to 90 mass % of (A) a sorbitan oleate ester, 5 to 60 mass % of (B) an edible oil or fat having a melting point of 10°C or less, and 0.5 to 5 mass % of (C) a polyoxyethylene sorbitan fatty acid ester" (Patent Document 1) is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-210215 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional defoaming agents have the problem that they are unable to achieve good surface finish (no repelling or marks from foam breakage) while maintaining excellent defoaming properties (foam breaking and foam suppression effects). An object of the present invention is to provide a defoaming agent that can exhibit excellent defoaming properties (foam breaking and foam suppression effects) as well as excellent surface finish (cissing and foam breakage marks). [Means for solving the problem]

[0005] The dispersed defoaming agent of the present invention is characterized in that it comprises a dispersoid comprising a liquid glycerin fatty acid ester (A), a dispersion medium comprising a liquid alkylene oxide adduct (B), and at least one hydrophobic substance (C) selected from the group consisting of hydrophobic silica, fatty acid metal salts, fatty acid amides, and waxes, and the content of the liquid glycerin fatty acid ester (A) is 4 to 49% by weight, the content of the liquid alkylene oxide adduct (B) is 51 to 96% by weight, and the content of the hydrophobic substance (C) is 0.1 to 15% by weight, based on the weights of the liquid glycerin fatty acid ester (A) and the liquid alkylene oxide adduct (B).

[0006] The water-based resin emulsion of the present invention is characterized in that it contains the above-mentioned dispersed defoaming agent, water, and a resin. [Effects of the Invention]

[0007] The defoaming agent of the present invention has excellent defoaming properties (foam breaking and foam suppression effects) as well as excellent surface finish (cissing and broken foam marks).

[0008] The aqueous resin emulsion of the present invention contains the above-mentioned dispersed defoaming agent, and therefore exhibits excellent defoaming properties (foam breaking and foam suppression effects) as well as excellent surface finish (cissing and marks from broken foam). [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a photograph of the phase state of the dispersed defoaming agent of the present invention prepared in Example 1, taken with a phase contrast microscope (200x magnification). DETAILED DESCRIPTION OF THE INVENTION

[0010] As the liquid glycerin fatty acid ester (A), any glycerin fatty acid ester that is liquid (0.1 to 50000 mPa·s) at 25°C can be used without any restrictions.

[0011] Liquid glycerin fatty acid esters (A) include esters of glycerin with fatty acids having 6 to 22 carbon atoms or mixtures thereof (glycerin fatty acid triesters, glycerin fatty acid diesters, and glycerin fatty acid monoesters), and examples thereof include vegetable oils (rapeseed oil, soybean oil, palm oil, coconut oil, olive oil, etc.), fish oils (anchovy oil, tuna oil, herring oil, salmon oil, krill oil, cod liver oil, etc.), fatty acid triglycerides (trade names, for example, Panasate 875; NOF Corporation; "Panasate" is a registered trademark of the company), and fatty acid mono- and diglycerides (trade names, for example, Poem OL-200VM, Glycerin Mono-Diolate; Riken Vitamin Co., Ltd.; "Poem" is a registered trademark of the company).

[0012] The content (wt %) of the liquid glycerin fatty acid ester (A) based on the weight of the liquid glycerin fatty acid ester (A) and the liquid alkylene oxide adduct (B) is preferably 4 to 49, more preferably 8 to 48, and particularly preferably 15 to 47. Within this range, the defoaming property and surface finish are further improved.

[0013] The liquid alkylene oxide adduct (B) can be any alkylene oxide adduct that is liquid (0.1 to 50,000 mPa s) at 25° C. without any limitations. When the liquid alkylene oxide adduct (B) contains a plurality of alkylene oxide adducts, the entire mixture should be liquid.

[0014] The liquid alkylene oxide adduct (B) includes alkylene oxide adducts of active hydrogen compounds and fatty acid esters of alkylene oxide adducts of active hydrogen compounds.

[0015] In the liquid alkylene oxide adduct (B), the alkylene oxide is at least one selected from the group consisting of ethylene oxide, propylene oxide, and alkyl glycidyl ether. Examples of alkyl glycidyl ethers include alkyl glycidyl ethers having 4 to 18 carbon atoms, such as methyl glycidyl ether, ethyl glycidyl ether, butyl glycidyl ether, 2-ethylhexyl glycidyl ether, dodecyl glycidyl ether, and octadecyl glycidyl ether.

[0016] A plurality of types of alkylene oxides (oxyalkylene groups) may be contained, and when a plurality of types of alkylene oxides (oxyalkylene groups) are contained, they may be in a random form, a block form, or a mixture thereof.

[0017] In the liquid alkylene oxide adduct (B), the proportion (wt%) of oxyethylene groups among the oxyalkylene groups constituting the alkylene oxide adduct is preferably 0 to 60 based on the weight of the oxyalkylene groups, but when the oxyalkylene groups contain oxyethylene groups, the proportion (wt%) of oxyethylene groups is preferably 1 to 60, more preferably 2 to 50, and particularly preferably 4 to 40. Within this range, the defoaming properties and surface finish will be further improved.

[0018] The number of moles (moles) of alkylene oxide added to the alkylene oxide adduct relative to 1 mole (equivalent) of active hydrogen of the active hydrogen compound is preferably 1 to 100, more preferably 2 to 75, and particularly preferably 5 to 60. Within this range, the defoaming properties and surface finish are further improved.

[0019] The active hydrogen compounds include compounds containing at least one active hydrogen group selected from the group consisting of a hydroxyl group (-OH), an imino group (-NH-), an amino group (-NH2), and / or a carboxyl group (-COOH), and include alcohols, amides, amines, carboxylic acids, hydroxycarboxylic acids, and glycerides having a hydroxyl group.

[0020] Examples of alcohols include monools (methanol, butanol, stearyl alcohol, oleyl alcohol, isostearyl alcohol, etc.) and polyols (ethylene glycol, propylene glycol, glycerin, diglycerin, tetraglycerin, trimethylolpropane, pentaerythritol, dipentaerythritol, dihydroxyacetone, fructose, glucose, mannose, galactose, sucrose, lactose, trehalose, etc.).

[0021] Examples of the amide include monoamides (formic acid amide, propionic acid amide, stearyl amide, etc.) and polyamides (malonic acid diamide, ethylene bis octyl amide, etc.).

[0022] Examples of the amine include monoamines (such as dimethylamine, ethylamine, aniline, and stearylamine) and polyamines (such as ethylenediamine, diethylenetriamine, and triethylenetetramine).

[0023] Carboxylic acids include monocarboxylic acids (such as acetic acid, propanoic acid, 2-ethylhexanoic acid, stearic acid, oleic acid, and benzoic acid) and polycarboxylic acids (such as maleic acid and hexanedioic acid).

[0024] Examples of hydroxycarboxylic acids include hydroxyacetic acid, tartaric acid, malic acid, and 12-hydroxystearic acid.

[0025] Examples of glycerides having a hydroxyl group include carboxylic acid monoglycerides (such as glycerin monoricinolate), carboxylic acid diglycerides (such as glycerin diricinolate), and carboxylic acid triglycerides (such as castor oil, hydrogenated castor oil, and glycerin triricinolate).

[0026] Among the active hydrogen compounds, alcohols and glycerides having a hydroxyl group are preferred from the viewpoints of defoaming properties and surface finish. That is, the liquid alkylene oxide adduct (B) is preferably at least one selected from the group consisting of alkylene oxide adducts of alcohols, alkylene oxide adducts of glycerides having a hydroxyl group, and fatty acid esters thereof.

[0027] Examples of fatty acids that can constitute the fatty acid ester of the alkylene oxide adduct of an active hydrogen compound include the above-mentioned monocarboxylic acids.

[0028] The content (wt %) of the liquid alkylene oxide adduct (B) based on the weight of the liquid glycerin fatty acid ester (A) and the liquid alkylene oxide adduct (B) is preferably 51 to 96, more preferably 52 to 92, and particularly preferably 53 to 85. Within this range, the defoaming property and surface finish are further improved.

[0029] Among the at least one hydrophobic substance (C) selected from the group consisting of hydrophobic silica, fatty acid metal salts, fatty acid amides, and waxes, the hydrophobic silica includes hydrophobic silica (hydrophobic wet silica, hydrophobic dry silica, etc.) obtained by subjecting silica (wet silica, dry silica, etc.) to hydrophobic treatment with a hydrophobizing agent. Examples of the hydrophobizing agent include dimethylpolysiloxane and dichlorodimethylsilane.

[0030] The M value (methanol wettability) of the hydrophobic silica is preferably from 5 to 80, more preferably from 25 to 75, and particularly preferably from 40 to 70. Within this range, the defoaming property and surface finish will be further improved.

[0031] The M value (methanol wettability) is a characteristic value that indicates the degree of hydrophobic treatment on the powder surface. A higher M value indicates a lower hydrophilicity and a higher degree of hydrophobic treatment (higher hydrophobicity). It is expressed as the minimum volume fraction of methanol required to uniformly disperse the powder (particles to be measured) in a water-methanol mixed solution, and can be calculated using the following method.

[0032] <Method for Measuring M Value> Prepare a water / methanol mixed solution with the methanol concentration varying at intervals of 5% by volume, and put 5 ml of this solution into a test tube with a volume of 10 ml. Then add 0.2 g of the measurement sample, cover the test tube, invert it up and down 20 times, and let it stand for 1 - 2 minutes. After that, observe the content. Among the dispersions where there is no aggregate and all of the measurement sample is wet and uniformly dispersed, the methanol concentration (volume %) of the dispersion with the lowest methanol concentration is defined as the M value {It is common practice not to describe the unit (volume %) of the M value.}.

[0033] The volume-based median diameter (d50; μm) of the hydrophobic wet silica is preferably 0.1 - 20, more preferably 1 - 10, and particularly preferably 6 - 7. When it is within this range, the defoaming property becomes even better.

[0034] The volume-based median diameter (d50) is measured using a laser diffraction particle size analyzer compliant with JIS Z8825:2022 {For example, Microtrac series manufactured by Leeds&Northrup, Partica LA series manufactured by Horiba, Ltd.}. Add the measurement sample to 1000 parts by weight of 2-propanol {with a purity of 99% by weight or more} so that the measurement sample concentration is 0.1% by weight to prepare a measurement dispersion. After measuring at a measurement temperature of 25 ± 5°C, use 1.3749 as the refractive index of 2-propanol and the literature value (「A GUIDE FOR ENTERING MICROTRAC ”RUN INFORMATION”(F3)DATA」, created by Leeds&Northrup) as the refractive index of the measurement sample, and obtain it as the 50% integrated volume average particle diameter.

[0035] The primary particle diameter (nm) of the hydrophobic dry silica is preferably 1 - 100, more preferably 5 - 60, and particularly preferably 7 - 16.

[0036] The primary particle diameter (nm) of particles is the number-average circle-equivalent diameter calculated using image processing computer software (e.g., WinRoof by Mitani Corporation) in accordance with JIS Z8901-2006 "Test powders and test particles," 5.4.4 Particle size distribution c) Microscopy, in which a sample prepared by the sprinkling method is observed under a transmission electron microscope at 50,000 to 1,000,000 times magnification, in accordance with JIS Z8827-1:2018 (corresponding international standard; ISO13322-1:2014) "Particle size - Image analysis methods - Part 1: Static image analysis methods."

[0037] Hydrophobic silica is readily available on the market, and examples thereof include the following products: Examples of hydrophobic wet silica include the Nipsil SS series (SS-10, SS-50, SS-115, etc.); the Nipgel series (AY-200, AZ-400, BZ-400, CY-200, etc.) (Tosoh Silica Corporation; "Nipsil" and "NIPGEL" are registered trademarks of Tosoh Silica Corporation. The same applies to registered trademarks below.)}; and the Sipernat D series (D10, D17, etc.) (Degussa Japan Corporation; "SIPERNAT" is a registered trademark of Evonik Degussa GmbH.)}.

[0038] Examples of hydrophobic dry silica include the Aerosil series (R972, RX200, RY200, R202, R805, and R812, etc.) (Nippon Aerosil Co., Ltd. and Evonik Degussa GmbH, "Aerosil" is a registered trademark of Evonik Degussa GmbH. The same applies to registered trademarks below.) and the Reolosil MT and DM series (MT-10, DM-10, DM-20S, etc.) (Tokuyama Corporation, "Reolosil" is a registered trademark of Tokuyama Corporation.)

[0039] Of the hydrophobic substances (C), fatty acid metal salts include salts of fatty acids having 12 to 22 carbon atoms with metals (such as alkaline earth metals, aluminum, manganese, cobalt, copper, iron, zinc, and nickel), and examples thereof include aluminum stearate, manganese stearate, cobalt stearate, copper stearate, iron stearate, nickel stearate, calcium stearate, zinc laurate, and magnesium behenate.

[0040] In the fatty acid metal salt, the quantitative relationship between the metal and the fatty acid may be 1 to 3 moles (mono-, di-, or tri-form) of fatty acid per mole of metal, or a mixture of mono-, di-, and tri-forms may be used.

[0041] Of the hydrophobic substances (C), fatty acid amides include reaction products (fatty acid diamides) of alkylenediamines or alkenylenediamines having 1 to 6 carbon atoms with fatty acids having 10 to 22 carbon atoms, and / or reaction products (fatty acid monoamides) of alkylamines, alkenylamines or ammonia having 1 to 22 carbon atoms with fatty acids having 10 to 22 carbon atoms.

[0042] Examples of fatty acid diamides include ethylene bisstearylamide, ethylene bispalmitylamide, ethylene bismyristylamide, ethylene bislaurylamide, ethylene bisoleylamide, propylene bisstearylamide, propylene bispalmitylamide, propylene bismyristylamide, propylene bislaurylamide, propylene bisoleylamide, butylene bisstearylamide, butylene bispalmitylamide, butylene bismyristylamide, butylene bislaurylamide, butylene bisoleylamide, methylene bislaurylamide, methylene bisstearylamide, and hexamethylene bisstearylamide.

[0043] Examples of fatty acid monoamides include N-stearylstearylamide, oleic acid amide, erucic acid amide, and stearylamide.

[0044] Of the hydrophobic substances (C), examples of waxes include oxidized polyethylene wax, microcrystalline wax, paraffin wax, alcohol-modified wax, maleic acid-modified wax, ethylene-vinyl acetate copolymer wax, ethylene-acrylic acid copolymer wax, Fischer-Tropsch wax, Japan wax, beeswax, palm wax, carnauba wax, montan wax, and rice wax.

[0045] Of the hydrophobic substances (C), hydrophobic silica, fatty acid amides and waxes are preferred from the viewpoint of defoaming properties and surface finish, and hydrophobic silica is more preferred.

[0046] The content (wt %) of the hydrophobic substance (C) based on the weight of the liquid glycerin fatty acid ester (A) and the liquid alkylene oxide adduct (B) is preferably 0.1 to 15, more preferably 1 to 10, and particularly preferably 2.9 to 9.3. Within this range, the defoaming property and surface finish are further improved.

[0047] The dispersible defoaming agent of the present invention may contain a hydrophilic liquid (D) as needed. Examples of the hydrophilic liquid (D) include alkylene oxide adducts of active hydrogen compounds, fatty acid esters of alkylene oxide adducts of active hydrogen compounds, water, glycerin, and alkylene glycols having 2 to 4 carbon atoms.

[0048] In the alkylene oxide adduct of the active hydrogen compound in the hydrophilic liquid (D), the alkylene oxide is ethylene oxide and / or propylene oxide.

[0049] A plurality of types of alkylene oxides (oxyalkylene groups) may be contained, and when a plurality of types of alkylene oxides (oxyalkylene groups) are contained, they may be in a random form, a block form, or a mixture thereof.

[0050] In the alkylene oxide adduct of an active hydrogen compound in the hydrophilic liquid (D), the proportion (wt %) of oxyethylene groups among the oxyalkylene groups constituting the alkylene oxide adduct, based on the weight of the oxyalkylene groups, is preferably 61 to 100, and when oxyethylene and oxypropylene are contained, it is preferably 61 to 99, more preferably 65 to 90, and particularly preferably 69 to 82. Within this range, the defoaming properties and surface finish are further improved.

[0051] The number of moles (moles) of alkylene oxide added to the alkylene oxide adduct relative to 1 mole (equivalent) of active hydrogen of the active hydrogen compound is preferably 1 to 100, more preferably 2 to 75, and particularly preferably 5 to 60. Within this range, the defoaming properties and surface finish are further improved.

[0052] The active hydrogen compound is the same as the liquid alkylene oxide adduct (B), and among the active hydrogen compounds, alcohols and glycerides having a hydroxyl group are preferred from the viewpoints of defoaming properties and surface finish. That is, the hydrophilic liquid (D) is preferably at least one selected from the group consisting of alkylene oxide adducts of alcohols, alkylene oxide adducts of glycerides having a hydroxyl group, and fatty acid esters thereof.

[0053] Examples of fatty acids that can constitute the fatty acid ester of the alkylene oxide adduct of an active hydrogen compound include the above-mentioned monocarboxylic acids.

[0054] When the dispersible defoaming agent of the present invention contains a hydrophilic liquid (D), the content (wt%) of the hydrophilic liquid (D) is 1 × 10 based on the weight of the liquid glycerin fatty acid ester (A) and the liquid alkylene oxide adduct (B). -3 Preferably, it is 1×10 or less, and more preferably, it is 1×10 -1 It is preferably from 1 to 28, and particularly preferably from 1 to 26. Within this range, the defoaming property and surface finish will be further improved.

[0055] The dispersible defoaming agent of the present invention may contain other components (mineral oil, aliphatic alcohol, fatty acid, fatty acid ester, fatty acid amide, and / or modified silicone oil, etc.) within the range that does not impair the effects of the present invention, but it is preferable that the dispersible defoaming agent does not contain mineral oil and modified silicone oil.

[0056] The dispersible defoaming agent of the present invention may be produced by any method that can uniformly mix the liquid glycerin fatty acid ester (A), the liquid alkylene oxide adduct (B), at least one hydrophobic substance (C) selected from the group consisting of hydrophobic silica, fatty acid metal salts, fatty acid amides, and waxes, and, if necessary, the hydrophilic liquid (D) and / or other components, without any particular limitation, and any known mixing method or the like can be used.

[0057] The hydrophobic substance (C), and optionally the hydrophilic liquid (D) and / or other components may be contained in either the dispersoid containing the liquid glycerin fatty acid ester (A) or the dispersion medium containing the liquid alkylene oxide adduct (B), or may be contained in both the dispersoid and the dispersion medium.

[0058] The dispersed defoaming agent of the present invention is effective for aqueous resin solutions (usages, etc.) and aqueous resin emulsions (o / w resin emulsions, uses: water-based paints, water-based adhesives, paper coating agents, latex, etc.). Of these, it is particularly effective for aqueous resin emulsions. Examples of water-soluble resins for aqueous resin solutions include polyvinyl alcohol. Examples of resins for aqueous resin emulsions include acrylic resins, vinyl acetate resins, and nitrile rubber.

[0059] The amount of the antifoaming agent of the present invention used can be determined appropriately depending on the type of foaming liquid and the foaming state, for example, about 0.005 to 0.2% by weight based on the weight of the foaming liquid. [Example]

[0060] Hereinafter, unless otherwise specified, all parts mean parts by weight. Liquid alkylene oxide adducts (B) and hydrophilic liquids (D) for which no source of supply is specified were prepared by known methods (such as alkylene oxide addition reaction and esterification reaction).

[0061] Example 1 36.7 parts of a liquid alkylene oxide adduct (b1: an ethylene oxide (13 mol) propylene oxide (40 mol) block adduct of decyl alcohol) and 1.1 parts of a hydrophobic substance (c1: hydrophobic dry silica particles, Aerosil R972, Degussa Japan Co., Ltd., M value 43, number average primary particle size 16 nm) were uniformly mixed, and then 36.4 parts of a liquid alkylene oxide adduct (b2: a propylene oxide (40 mol) ethylene oxide (14 mol) block adduct of glycerin) and 1.1 parts of a hydrophilic liquid (d1: water) were added and uniformly mixed to prepare 75.3 parts of a dispersion medium (1).

[0062] Separately, 26.9 parts of a liquid glycerin fatty acid ester (a1: rapeseed oil, Okamura Oil Mills, Ltd.) and 5.4 parts of a hydrophobic substance (c2: NIPSIL SS-215, Tosoh Silica Corporation, hydrophobic wet silica particles, M value 65, volume-based median diameter 6 μm) were uniformly mixed and homogenized using a pressure homogenizer (SMT Corporation) at 3500 psi (24.1 MPa) to obtain 32.3 parts of dispersoid (1).

[0063] 75.3 parts of the dispersion medium (1) and 32.3 parts of the dispersoid (1) were uniformly mixed to obtain a dispersed defoaming agent (1) of the present invention.

[0064] A dispersive defoaming agent containing a dispersoid consisting of a liquid glycerin fatty acid ester (A) and a dispersion medium consisting of a liquid alkylene oxide adduct (B). <1> Observation of the phase state using a phase contrast microscope <2> This was confirmed by determining the dispersion medium (continuous phase) and dispersoid (discontinuous layer) by measuring electrical conductivity.

[0065] <1> A small amount of the evaluation material (dispersed defoaming agent) was attached to a slide glass, and a cover glass was placed on top to prepare a preparation. The phase state of the measurement sample was observed at 200x magnification using a phase contrast microscope (Olympus BX60F5, Olympus Corporation; "Olympus" is a registered trademark of the company) (similar observations were made for other Examples). As shown in Figure 1, the dispersion medium (continuous phase) and dispersoid (discontinuous layer) were observed for the dispersed defoaming agent (1) obtained in Example 1, and it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0066] <2> It is known that when measuring the electrical conductivity of a mixture containing two or more liquid phases, the electrical conductivity is the value of the electrical conductivity of the dispersion medium (continuous phase) (the hydrophobic substance (c) has almost no effect) (for example, "Introductory Lecture: Emulsions and HLB," Oleoscience, Vol. 1, No. 2, 2001, by Hironobu Kunieda and Kenji Aramaki, published by the Japan Oil Chemists' Society; "The Science of Emulsions (II)," Cooking Science, Vol. 6, No. 4, 1973, by Tetsuya Hanai, published by the Japan Cooking Science Society). Therefore, the electrical conductivity was measured using a conductivity meter (DT-700, Dispersion Technology, Inc.) (the average value of 50 measurements; similar measurements were also taken for other Examples). The electrical conductivity of the dispersed defoaming agent (1) of Example 1 was 9.7 × 10 -7 It was S / m.

[0067] The electrical conductivity of "dispersoid (1) consisting of 26.9 parts of liquid glycerin fatty acid ester (a1) and 5.4 parts of hydrophobic substance (c2)" is 3.8 × 10 -11 The electrical conductivity of the "dispersion medium (1) consisting of 36.7 parts of a liquid alkylene oxide adduct (b1), 1.1 parts of a hydrophobic substance (c1), 36.4 parts of a liquid alkylene oxide adduct (b2), and 1.1 parts of a hydrophilic liquid (d1: water)" was 1.1 × 10 -6 It was S / m.

[0068] Therefore, it was found that the dispersion defoaming agent (1) of Example 1 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b1), the liquid alkylene oxide adduct (b2), the hydrophobic substance (c1) and the aqueous liquid (d1), and a dispersoid (discontinuous layer) composed of the liquid glycerin fatty acid ester (a1) and the hydrophobic substance (c2).

[0069] <Example 2> 57.1 parts of a liquid alkylene oxide adduct (b3: polypropylene glycol having a number average molecular weight of 1000, Primepol PX-1000, Sanyo Chemical Industries, Ltd.; "Primepol" is a registered trademark of the company), 3.7 parts of a hydrophilic liquid (d1), 1.2 parts of a hydrophilic liquid (d2: polyethylene glycol, number average molecular weight Mn 200, PEG-200, Sanyo Chemical Industries, Ltd.), and 9.2 parts of a hydrophilic liquid (d3: ethylene oxide (10 mol) adduct of castor oil, Braunon BR-410, Aoki Oil & Fat Co., Ltd.; "Braunon" is a registered trademark of the company) were uniformly mixed to prepare 71.2 parts of a dispersion medium (2).

[0070] 71.2 parts of the dispersion medium (2) and 51.5 parts of the dispersoid (1) prepared in the same manner as in Example 1 {42.9 parts of the liquid glycerin fatty acid ester (a1) and 8.6 parts of the hydrophobic substance (c2)} were uniformly mixed to obtain a dispersed defoaming agent (2) of the present invention.

[0071] <1> When the phase state of the dispersed defoaming agent (2) obtained in Example 2 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0072] <2> The electrical conductivity of the dispersed defoaming agent (2) obtained in Example 2 was 8.8 × 10 -7 The electrical conductivity of the "dispersoid (1) consisting of 42.9 parts of liquid glycerin fatty acid ester (a1) and 8.6 parts of hydrophobic substance (c2)" was 3.8 × 10 -11 The electrical conductivity of the "dispersion medium (2) consisting of 57.1 parts of liquid alkylene oxide adduct (b3), 3.7 parts of hydrophilic liquid (d1), 1.2 parts of hydrophilic liquid (d2), and 9.2 parts of hydrophilic liquid (d3)" was 2.6 × 10-6 It was S / m.

[0073] Therefore, it was found that the dispersion defoaming agent (2) of Example 2 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b3), the aqueous liquid (d1), the hydrophilic liquid (d1), the hydrophilic liquid (d2) and the hydrophilic liquid (d3), and a dispersoid (discontinuous layer) composed of the liquid glycerin fatty acid ester (a1) and the hydrophobic substance (c2).

[0074] Example 3 79.1 parts of dispersion medium (3) were prepared by uniformly mixing 1.0 part of a liquid alkylene oxide adduct (b10: polyoxyethylene polyoxypropylene polyoxyethylene block polymer, the number average molecular weight of the polyoxypropylene chain portion is approximately 1750, the total number average molecular weight is 2000, Newpol PE-61, Sanyo Chemical Industries, Ltd.; "Newpol" is a registered trademark of the company; the same applies below to registered trademarks), 1.0 part of a liquid alkylene oxide adduct (b11: a propylene oxide (5 moles) adduct of butanol, Newpol LB-65, Sanyo Chemical Industries, Ltd.), and 77.1 parts of a liquid alkylene oxide adduct (b12: polyoxyethylene polyoxypropylene polyoxyethylene block polymer, the number average molecular weight of the polyoxypropylene chain portion is approximately 1750, the total number average molecular weight is 2400, Newpol PE-62, Sanyo Chemical Industries, Ltd.).

[0075] 79.1 parts of the dispersion medium (3) and 25.1 parts of the dispersoid (1) prepared in the same manner as in Example 1 {20.9 parts of the liquid glycerin fatty acid ester (a1) and 4.2 parts of the hydrophobic substance (c2)} were uniformly mixed to obtain a dispersed defoaming agent (3) of the present invention.

[0076] <1> When the phase state of the dispersed defoaming agent (3) obtained in Example 3 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0077] <2> The electrical conductivity of the dispersed defoaming agent (3) obtained in Example 3 was 3.4 × 10 -8The electrical conductivity of the "dispersoid (1) consisting of 20.9 parts of liquid glycerin fatty acid ester (a1) and 4.2 parts of hydrophobic substance (c2)" was 3.8 × 10 -11 The electrical conductivity of the "dispersion medium (3) consisting of 1.0 part of the liquid alkylene oxide adduct (b10), 1.0 part of the liquid alkylene oxide adduct (b11), and 77.1 parts of the liquid alkylene oxide adduct (b12)" was 3.7 × 10 -8 It was S / m.

[0078] Therefore, it was found that the dispersion medium (continuous phase) of the dispersed defoaming agent (3) of Example 3 was composed of the liquid alkylene oxide adduct (b10), the liquid alkylene oxide adduct (b11) and the liquid alkylene oxide adduct (b12), and the dispersoid (discontinuous layer) was composed of the liquid glycerin fatty acid ester (a1) and the hydrophobic substance (c2).

[0079] Example 4 61.3 parts of the liquid alkylene oxide adduct (b12) and 1.1 parts of a liquid alkylene oxide adduct (b13: a propylene oxide (40 mol) adduct of butanol, Newpol LB-1715, Sanyo Chemical Industries, Ltd.) were uniformly mixed to prepare 62.4 parts of a dispersion medium (4).

[0080] 62.4 parts of the dispersion medium (4) and 45.1 parts of the dispersoid (1) prepared in the same manner as in Example 1 {37.6 parts of the liquid glycerin fatty acid ester (a1) and 7.5 parts of the hydrophobic substance (c2)} were uniformly mixed to obtain a dispersed defoaming agent (4) of the present invention.

[0081] <1> When the phase state of the dispersed defoaming agent (4) obtained in Example 4 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0082] <2> The electrical conductivity of the dispersed defoaming agent (4) obtained in Example 4 was 3.1 × 10 -8 The electrical conductivity of the "dispersoid (1) consisting of 37.6 parts of liquid glycerin fatty acid ester (a1) and 7.5 parts of hydrophobic substance (c2)" was 3.8 × 10-11 The electrical conductivity of the "dispersion medium (4) consisting of 61.3 parts of the liquid alkylene oxide adduct (b12) and 1.1 parts of the liquid alkylene oxide adduct (b13)" was 3.2 × 10 -8 It was S / m.

[0083] Therefore, it was found that the dispersion defoaming agent (4) of Example 4 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b12) and the liquid alkylene oxide adduct (b13), and a dispersoid (discontinuous phase) composed of the liquid glycerin fatty acid ester (a1) and the hydrophobic substance (c2).

[0084] <Example 5> 37.6 parts of a liquid glycerin fatty acid ester (a2: cottonseed oil, Okamura Oil Mills, Ltd.) and 7.5 parts of a hydrophobic substance (c1) were uniformly mixed and homogenized at 3500 psi (24.1 MPa) using a pressure homogenizer (SMT Corporation) to obtain 45.1 parts of dispersoid (5).

[0085] 62.4 parts of the dispersion medium (5; liquid alkylene oxide adduct (b2)) and 45.1 parts of the dispersoid (5) were uniformly mixed to obtain a dispersed defoaming agent (5) of the present invention.

[0086] <1> When the phase state of the dispersed defoaming agent (5) obtained in Example 5 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0087] <2> The electrical conductivity of the dispersed defoaming agent (5) obtained in Example 5 was 2.3 × 10 -8 The electrical conductivity of the "dispersoid (5) consisting of 37.6 parts of liquid glycerin fatty acid ester (a2) and 7.5 parts of hydrophobic substance (c1)" was 5.8 × 10 -11 S / m. The electrical conductivity of the "dispersion medium (5) consisting of 62.4 parts of the liquid alkylene oxide adduct (b2)" was 2.5 × 10 -8 It was S / m.

[0088] Therefore, it was found that the dispersion defoaming agent (5) of Example 5 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b2), and a dispersoid (discontinuous phase) composed of the liquid glycerin fatty acid ester (a2) and the hydrophobic substance (c1).

[0089] Example 6 67.4 parts of a liquid alkylene oxide adduct (b3), 0.6 parts of a liquid alkylene oxide adduct (b4: ethylene oxide (3 moles) 2-ethylhexyl glycidyl ether (2 moles) block adduct of glycerin), 2.9 parts of a hydrophilic liquid (d1), 1.2 parts of a hydrophilic liquid (d2), 8.7 parts of a hydrophilic liquid (d3), and 0.6 parts of a hydrophilic liquid (d5: glycerin, RG, NOF Corporation) were uniformly mixed to prepare 81.4 parts of a dispersion medium (6).

[0090] Separately, 14.5 parts of the liquid glycerin fatty acid ester (a1) and 2.9 parts of a hydrophobic substance (c3: Alflow H-50S, NOF Corporation, ethylene bisstearylamide, softening point 143°C, "Alflow" is a registered trademark of NOF Corporation) were heated to 145°C with stirring, and heating and stirring were continued at this temperature for an additional 15 minutes. After that, this was added with stirring to 17.5 parts of the liquid glycerin fatty acid ester (a1) that had been cooled to 25°C or below, and then homogenized using a pressure homogenizer (SMT Corporation) at 3500 psi (24.1 MPa) to obtain 34.9 parts of dispersoids (6).

[0091] 81.4 parts of the dispersion medium (6) and 34.9 parts of the dispersoid (6) were uniformly mixed to obtain a dispersed defoaming agent (6) of the present invention.

[0092] <1> When the phase state of the dispersed defoaming agent (6) obtained in Example 6 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0093] <2> The electrical conductivity of the dispersed defoaming agent (6) obtained in Example 6 was 9.0 × 10 -7The electrical conductivity of the "dispersoid (6) consisting of 32.0 parts of liquid glycerin fatty acid ester (a1) and 2.9 parts of hydrophobic substance (c3)" was 3.9 × 10 -11 The electrical conductivity of "dispersion medium (6) consisting of 67.4 parts of liquid alkylene oxide adduct (b3), 0.6 parts of liquid alkylene oxide adduct (b4), 2.9 parts of hydrophilic liquid (d1), 1.2 parts of hydrophilic liquid (d2), 8.7 parts of hydrophilic liquid (d3), and 0.6 parts of hydrophilic liquid (d5)" was 9.8 × 10 -7 It was S / m.

[0094] Therefore, it was found that the dispersion defoaming agent (6) of Example 6 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b3), the liquid alkylene oxide adduct (b4), the hydrophilic liquid (d1), the hydrophilic liquid (d2), the hydrophilic liquid (d3) and the hydrophilic liquid (d5), and a dispersoid (discontinuous layer) composed of the liquid glycerin fatty acid ester (a1) and the hydrophobic substance (c3).

[0095] Example 7 Liquid alkylene oxide adduct (b1) 11.0 parts, liquid alkylene oxide adduct (b2) 53.3 parts, liquid alkylene oxide adduct (b5: polypropylene glycol with a number average molecular weight of 1140, Sannix 83.4 parts of dispersion medium (7) were obtained by uniformly mixing 8.2 parts of a liquid alkylene oxide adduct (b6: a propylene oxide (43 moles) adduct of glycerin, Sannix GP-3000, Sanyo Chemical Industries, Ltd.), 5.5 parts of a liquid alkylene oxide adduct (b6: a propylene oxide (43 moles) adduct of glycerin, Sannix GP-3000, Sanyo Chemical Industries, Ltd.), 2.2 parts of a hydrophilic liquid (d1), 2.2 parts of a hydrophilic liquid (d4: diethylene glycol, Nippon Shokubai Co., Ltd.), 0.5 parts of a hydrophilic liquid (d6: polyoxyethylene sorbitan oleate, Emazol O-120V, Kao Corporation; Emazol is a registered trademark of the company), and 0.5 parts of a hydrophilic liquid (d7: a block adduct of pentadecanol with ethylene oxide (2 moles), propylene oxide (2 moles), and ethylene oxide (4 moles)).

[0096] On the other hand, 22.0 parts of liquid glycerin fatty acid ester (a3: rice bran oil, Okamura Oil Mills, Ltd.) and 4.4 parts of hydrophobic substance (c1) were uniformly mixed and homogenized at 3500 psi (24.1 MPa) using a pressure homogenizer (SMT Corporation) to obtain 26.4 parts of dispersoid (7).

[0097] 83.4 parts of the dispersion medium (7) and 26.4 parts of the dispersoid (7) were uniformly mixed to obtain a dispersed defoaming agent (7) of the present invention.

[0098] <1> When the phase state of the dispersed defoaming agent (7) obtained in Example 7 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0099] <2> The electrical conductivity of the dispersed defoaming agent (7) obtained in Example 7 was 8.8 × 10 -7 The electrical conductivity of the "dispersoid (7) consisting of 22.0 parts of liquid glycerin fatty acid ester (a3) ​​and 4.4 parts of hydrophobic substance (c1)" was 4.4 × 10 -11 The electrical conductivity of "dispersion medium (7) consisting of 11.0 parts of liquid alkylene oxide adduct (b1), 53.3 parts of liquid alkylene oxide adduct (b2), 8.2 parts of liquid alkylene oxide adduct (b5), 5.5 parts of liquid alkylene oxide adduct (b6), 2.2 parts of hydrophilic liquid (d1), 2.2 parts of hydrophilic liquid (d4), 0.5 parts of hydrophilic liquid (d6), and 0.5 parts of hydrophilic liquid (d7)" was 9.5 × 10 -7 It was S / m.

[0100] Therefore, it was found that the dispersion defoaming agent (7) of Example 7 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b1), the liquid alkylene oxide adduct (b2), the liquid alkylene oxide adduct (b5), the liquid alkylene oxide adduct (b6), the hydrophilic liquid (d1), the hydrophilic liquid (d4), the hydrophilic liquid (d6) and the hydrophilic liquid (d7), and a dispersoid (discontinuous layer) composed of the liquid glycerin fatty acid ester (a3) ​​and the hydrophobic substance (c1).

[0101] Example 8 62.4 parts of a liquid alkylene oxide adduct (b3), 4.6 parts of a liquid alkylene oxide adduct (b7: polypropylene glycol having a number average molecular weight of 200, Sannix PP-200, Sanyo Chemical Industries, Ltd.), 0.6 parts of a liquid alkylene oxide adduct (b8: polypropylene glycol having a number average molecular weight of 3200, Sannix PP-3000, Sanyo Chemical Industries, Ltd.), 0.6 parts of a liquid alkylene oxide adduct (b9: propylene oxide (86 mol) ethylene oxide (5) block adduct of glycerin), 2.9 parts of a hydrophilic liquid (d1), 1.2 parts of a hydrophilic liquid (d2), and 8.7 parts of a hydrophilic liquid (d3) were uniformly mixed to obtain 81.0 parts of a dispersion medium (8).

[0102] Separately, 14.5 parts of the liquid glycerin fatty acid ester (a2) and 2.9 parts of a hydrophobic substance (c4: Hi-Mic-1070, Nippon Seiro Co., Ltd., microcrystalline wax, softening point 80°C, "Hi-Mic" is a registered trademark of Nippon Seiro Co., Ltd.) were heated to 145°C with stirring, and heating and stirring were continued at this temperature for an additional 15 minutes. After that, this was added to 17.3 parts of the liquid glycerin fatty acid ester (a2) that had been cooled to 25°C or below with stirring, and then homogenized at 3500 psi (24.1 MPa) using a pressure homogenizer (SMT Corporation) to obtain 34.7 parts of dispersoids (8).

[0103] 81.0 parts of the dispersion medium (8) and 34.7 parts of the dispersoid (8) were uniformly mixed to obtain a dispersed defoaming agent (8) of the present invention.

[0104] <1> When the phase state of the dispersed defoaming agent (8) obtained in Example 8 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0105] <2> The electrical conductivity of the dispersed defoaming agent (8) obtained in Example 8 was 8.3 × 10 -7 The electrical conductivity of the "dispersoid (8) consisting of 31.8 parts of liquid glycerin fatty acid ester (a2) and 2.9 parts of hydrophobic substance (c4)" was 2.7 × 10 -11The electrical conductivity of "dispersion medium (8) consisting of 62.4 parts of liquid alkylene oxide adduct (b3), 4.6 parts of liquid alkylene oxide adduct (b7), 0.6 parts of liquid alkylene oxide adduct (b8), 0.6 parts of liquid alkylene oxide adduct (b9), 2.9 parts of hydrophilic liquid (d1), 1.2 parts of hydrophilic liquid (d2), and 8.7 parts of hydrophilic liquid (d3)" was 8.9 × 10 -7 It was S / m.

[0106] Therefore, it was found that the dispersion defoaming agent (8) of Example 8 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b3), the liquid alkylene oxide adduct (b7), the liquid alkylene oxide adduct (b8), the liquid alkylene oxide adduct (b9), the hydrophilic liquid (d1), the hydrophilic liquid (d2) and the hydrophilic liquid (d3), and a dispersoid (discontinuous layer) composed of the liquid glycerin fatty acid ester (a2) and the hydrophobic substance (c4).

[0107] Example 9 65.9 parts of the liquid alkylene oxide adduct (b12), 1.1 parts of a liquid alkylene oxide adduct (b14: oleic acid ester of a butanol propylene oxide (25 mol) adduct), and 1.1 parts of a liquid alkylene oxide adduct (b15: oleic acid ester of a castor oil propylene oxide (30 mol) adduct) were uniformly mixed to obtain 68.1 parts of a dispersion medium (9).

[0108] 68.1 parts of the dispersion medium (9) and 38.3 parts of a dispersoid (5) prepared in the same manner as in Example 5 {31.9 parts of a liquid glycerin fatty acid ester (a2) and 6.4 parts of a hydrophobic substance (c1)} were uniformly mixed to obtain a dispersed defoaming agent (9) of the present invention.

[0109] <1> When the phase state of the dispersed defoaming agent (9) obtained in Example 9 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0110] <2> The electrical conductivity of the dispersed defoaming agent (9) obtained in Example 9 was 4.0 × 10 -8The electrical conductivity of the "dispersoid (5) consisting of 31.9 parts of liquid glycerin fatty acid ester (a2) and 6.4 parts of hydrophobic substance (c1)" was 5.8 × 10 -11 The electrical conductivity of the "dispersion medium (8) consisting of 65.9 parts of the liquid alkylene oxide adduct (b12), 1.1 parts of the liquid alkylene oxide adduct (b14), and 1.1 parts of the liquid alkylene oxide adduct (b15)" was 4.4 × 10 -8 It was S / m.

[0111] Therefore, it was found that the dispersion defoaming agent (9) of Example 9 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b12), the liquid alkylene oxide adduct (b14) and the liquid alkylene oxide adduct (b15), and a dispersoid (discontinuous layer) composed of the liquid glycerin fatty acid ester (a2) and the hydrophobic substance (c1).

[0112] Example 10 3.1 parts of a liquid glycerin fatty acid ester (a4: palm olein oil, Okamura Oil Mills, Ltd.) and 0.6 parts of a hydrophobic substance (c1) were uniformly mixed and homogenized at 3500 psi (24.1 MPa) using a pressure homogenizer (SMT Corporation). This was then uniformly mixed with 14.9 parts of a dispersoid (7) prepared in the same manner as in Example 7 {12.4 parts of a liquid glycerin fatty acid ester (a3) ​​and 2.5 parts of a hydrophobic substance (c1)} to obtain 18.6 parts of a dispersoid (10).

[0113] 84.5 parts of the dispersion medium (10; liquid alkylene oxide adduct (b12)) and 18.6 parts of the dispersoid (10) were uniformly mixed to obtain a dispersed defoaming agent (10) of the present invention.

[0114] <1> When the phase state of the dispersed defoaming agent (10) obtained in Example 10 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0115] <2> The electrical conductivity of the dispersed defoaming agent (10) obtained in Example 10 was 2.6 × 10 -8The electrical conductivity of the "dispersoid (10) consisting of 12.4 parts of liquid glycerin fatty acid ester (a3), 3.1 parts of liquid glycerin fatty acid ester (a4), and 3.1 parts of hydrophobic substance (c1)" was 3.5 × 10 -11 The electrical conductivity of the "dispersion medium (10) consisting of 84.5 parts of the liquid alkylene oxide adduct (b12)" was 3.0 × 10 -8 It was S / m.

[0116] Therefore, it was found that the dispersion defoaming agent (10) of Example 10 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b12), and a dispersoid (discontinuous layer) composed of the liquid glycerin fatty acid ester (a3), the liquid glycerin fatty acid ester (a4), and the hydrophobic substance (c1).

[0117] Example 11 53.3 parts of the liquid alkylene oxide adduct (b3), 3.4 parts of the hydrophilic liquid (d1), 1.3 parts of the hydrophilic liquid (d2), 20.2 parts of the hydrophilic liquid (d3), and 0.7 parts of a hydrophilic liquid (d8: a block adduct of pentadecanol with ethylene oxide (2 mol), propylene oxide (2 mol), and ethylene oxide (10 mol)) were uniformly mixed to obtain 78.9 parts of a dispersion medium (11).

[0118] 78.9 parts of the dispersion medium (11) and 56.0 parts of the dispersoid (5) prepared in the same manner as in Example 5 {46.7 parts of the liquid glycerin fatty acid ester (a2) and 9.3 parts of the hydrophobic substance (c1)} were uniformly mixed to obtain a dispersed defoaming agent (11) of the present invention.

[0119] <1> When the phase state of the dispersed defoaming agent (11) obtained in Example 11 was observed with a phase contrast microscope, it was confirmed that the dispersed defoaming agent was composed of at least two phases.

[0120] <2> The electrical conductivity of the dispersed defoaming agent (11) obtained in Example 11 was 9.1 × 10 -7 The electrical conductivity of the "dispersoid (5) consisting of 46.7 parts of liquid glycerin fatty acid ester (a2) and 9.3 parts of hydrophobic substance (c1)" was 5.8 × 10-11 The electrical conductivity of the "dispersion medium (11) consisting of 53.3 parts of the liquid alkylene oxide adduct (b3), 3.4 parts of the hydrophilic liquid (d1), 1.3 parts of the hydrophilic liquid (d2), 20.2 parts of the hydrophilic liquid (d3), and 0.7 parts of the hydrophilic liquid (d8)" was 2.2 × 10 -6 It was S / m.

[0121] Therefore, it was found that the dispersed defoaming agent (11) of Example 11 had a dispersion medium (continuous phase) composed of the liquid alkylene oxide adduct (b3), the hydrophilic liquid (d1), the hydrophilic liquid (d2), the hydrophilic liquid (d3) and the hydrophilic liquid (d8), and a dispersoid (discontinuous layer) composed of the liquid glycerin fatty acid ester (a2) and the hydrophobic substance (c1).

[0122] <Comparative Example> Based on the description of Example 1 of Patent Document 1, 25 parts of soybean oil (The Nisshin Oillio Group, Ltd.), 74 parts of sorbitan trioleate (Nonion OP-85R, NOF Corporation), and 1 part of polyoxyethylene (20 mol) sorbitan monooleate (Willsurf TF-80, NOF Corporation; "Willsurf" is a registered trademark of the company) were uniformly mixed at 80°C and then cooled to approximately 25°C, to obtain a comparative defoaming agent (H).

[0123] <Evaluation of anti-foaming properties> A mixture was prepared by uniformly stirring 90 g of acrylic styrene resin emulsion (BASF Japan Ltd., ACRONAL 295DN; "ACRONAL" is a registered trademark of BASF Societas Europea) and 10 g of ion-exchanged water. This mixture and 30 μL of the evaluation sample (any of the dispersed antifoaming agents (1) to (11) prepared in Examples 1 to 11 or the antifoaming agent (H) prepared in the Comparative Example) were then stirred for 5 minutes in a stand automixer DL-7524 (Kai Corporation, speed control lever 10) to prepare an aqueous resin emulsion. The aqueous resin emulsion after stirring was transferred to a 300 mL graduated cylinder, and its weight (g) and volume (ml) were measured 8 seconds after stirring was stopped. The specific gravity was calculated and shown in the table below. A higher specific gravity indicates higher defoaming ability, which is preferable. The specific gravity (blank) was calculated in the same manner as above, except that no antifoaming agent was added. The specific gravity was also calculated and shown in the table below.

[0124] <Evaluation of surface finish> After evaluating the defoaming properties, the aqueous resin emulsion was coated onto a glass plate using a 3 mil film applicator (FAs-2876, Coating Star Co., Ltd.), and the coated surface was visually evaluated for cissing and broken bubble marks. The evaluation results for cissing and broken bubble marks are shown in the table below.

[0125] [Table 1]

[0126] As described above, the defoaming agent of the present invention was superior to the comparative defoaming agent in defoaming properties while maintaining the surface finish.

Claims

1. a dispersoid comprising a liquid glycerin fatty acid ester (A); a dispersion medium comprising a liquid alkylene oxide adduct (B); and at least one hydrophobic substance (C) selected from the group consisting of hydrophobic silica, fatty acid metal salts, fatty acid amides, and waxes, A dispersible defoaming agent, characterized in that the content of the liquid glycerin fatty acid ester (A) is 4 to 49% by weight, the content of the liquid alkylene oxide adduct (B) is 51 to 96% by weight, and the content of the hydrophobic substance (C) is 0.1 to 15% by weight, based on the weights of the liquid glycerin fatty acid ester (A) and the liquid alkylene oxide adduct (B).

2. Further comprising a hydrophilic liquid (D), The content of the hydrophilic liquid (D) is 1×10 based on the weight of the liquid glycerin fatty acid ester (A) and the liquid alkylene oxide adduct (B). －３ 2. The dispersed defoaming agent according to claim 1, wherein the content is from 100 to 30% by weight.

3. the liquid alkylene oxide adduct (B) is at least one selected from the group consisting of alkylene oxide adducts of alcohols, alkylene oxide adducts of glycerides having a hydroxyl group, and fatty acid esters thereof; the alkylene oxide is at least one selected from the group consisting of ethylene oxide, propylene oxide, and alkyl glycidyl ether; 2. The dispersible defoaming agent according to claim 1, wherein the proportion of oxyethylene groups in the oxyalkylene groups constituting the alkylene oxide adduct is 0 to 60% by weight.

4. the hydrophilic liquid (D) is at least one selected from the group consisting of an alkylene oxide adduct of an alcohol, an alkylene oxide adduct of a glyceride having a hydroxyl group, a fatty acid ester thereof, water, glycerin, and an alkylene glycol having 2 to 4 carbon atoms; The alkylene oxide is at least one selected from the group consisting of ethylene oxide and propylene oxide, 3. The dispersed defoaming agent according to claim 2, wherein the proportion of oxyethylene groups in the oxyalkylene groups constituting the alkylene oxide adduct is 61 to 100% by weight.

5. 5. An aqueous resin emulsion comprising the dispersed defoaming agent according to claim 1, water, and a resin.

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