JP5505250B2 - Antifoam composition - Google Patents

Description

  The present invention relates to an antifoaming composition that is effective for various coating liquids (paint, ink, latex, etc.).

  Various coating liquids (paints, inks, latexes, etc.) contain a large amount of surfactant for dispersing pigments or improving coating film defects (craters, repelling, pinholes, etc.). Since foam is generated during construction, an antifoaming agent is often blended.

  However, if a conventional antifoaming agent based on hydrophobic polydimethylsiloxane is added to the coating agent, coating defects (pinholes, fish eyes, oil spots, etc.) due to repelling due to lack of compatibility with the coating agent Often occurred and a solution was sought.

  In order to solve this problem, an antifoaming agent in which a polysiloxane containing a long-chain alkyl group or an aralkyl group and a polyoxyalkylene chain-containing polysiloxane are combined (Japanese Patent Laid-Open No. 56-129003: Patent Document 1), one molecule Antifoaming agent comprising polysiloxane having both polyoxyalkylene group and long chain alkyl group or aralkyl group therein (Japanese Patent Laid-Open No. 57-180407: Patent Document 2), polysilcarbenesiloxane comprising silcarbene unit and siloxane unit An antifoaming agent (JP-A-8-108007: Patent Document 3), an antifoaming agent comprising a reaction product of an alkylene oxide compound, a silicone having an alcoholic hydroxyl group, and an isocyanate compound (Japanese Patent Publication No. 7-90126) Publication: Patent Document 4), Siloxane-glycol copolymer and polypropylene An antifoaming agent made of coal (Japanese Patent Publication No. 54-9144: Patent Document 5) has been proposed, but obtaining an antifoaming agent composition having a good balance of antifoaming performance, dispersibility, and paintability is possible. Difficult and further improvements are needed.

JP-A-56-129003 JP-A-57-180407 JP-A-8-108007 Japanese Patent Publication No. 7-90126 Japanese Patent Publication No.54-9144

  This invention is made | formed in view of the said situation, and it aims at providing the antifoamer composition which has high antifoaming performance, dispersibility, and paintability with respect to various coating liquids.

  As a result of intensive studies to achieve the above object, the present inventors have (A) organopolysiloxane 70 to 99.9 having a modifying group containing an ester bond group represented by the general formula (1). An antifoaming agent composition comprising 0.1% by mass and 0.1% by mass of finely divided silica (B) has high antifoaming performance, dispersibility, and paintability for various coating liquids. The present inventors have found that it can be a product, and have made the present invention.

［式中、Ｒ¹は独立に水酸基又は炭素原子数１〜１８の１価炭化水素基であり、Ｒ²は独立に下記一般式（２）

（式中、Ｘは酸素原子又はメチレン基であり、Ｒ³は炭素原子数１〜１８の２価炭化水素基であり、Ｅはエステル結合基［−Ｃ（＝Ｏ）−Ｏ−又は−Ｏ−Ｃ（＝Ｏ）−］であり、Ｒ⁴は炭素原子数１〜１８の１価炭化水素基である。）
で表される分子内にエステル結合基を含有する変性基、上記Ｒ¹、水素原子、又は炭素原子数１〜４のアルコキシ基であり、但し、前記一般式（１）の分子中に含まれるＲ²のうち、少なくとも１つは前記一般式（２）で表される分子内にエステル結合基を含有する変性基である。ｍは３〜１００の整数、ｎは０〜５の整数である。］
で表されるエステル結合基を含有する変性基を有するオルガノポリシロキサン： ７０〜９９．９質量部、
（Ｂ）微粉末シリカ： ０．１〜３０質量部
（但し、上記（Ａ）成分と上記（Ｂ）成分の合計量は１００質量部である。）
からなる消泡剤組成物。
〔請求項２〕
ウレタン樹脂塗料、エポキシ樹脂塗料、フレキソインキ、グラビアインキ又はラテックス用である請求項１記載の消泡剤組成物。 Therefore, this invention provides the antifoamer composition shown below.
[Claim 1]
(A) The following general formula (1)

[Wherein, R ¹ is independently a hydroxyl group or a monovalent hydrocarbon group having 1 to 18 carbon atoms, and R ² is independently the following general formula (2)

(In the formula, X is an oxygen atom or a methylene group, R ³ is a divalent hydrocarbon group having 1 to 18 carbon atoms, and E is an ester bond group [—C (═O) —O— or —O]. —C (═O) —], and R ⁴ is a monovalent hydrocarbon group having 1 to 18 carbon atoms.
A modified group containing an ester bond group in the molecule represented by the above, R ¹ , a hydrogen atom, or an alkoxy group having 1 to 4 carbon atoms, provided that it is contained in the molecule of the general formula (1). At least one of R ² is a modifying group containing an ester bond group in the molecule represented by the general formula (2). m is an integer of 3 to 100, and n is an integer of 0 to 5. ]
An organopolysiloxane having a modifying group containing an ester bond group represented by: 70 to 99.9 parts by mass,
(B) Fine powder silica: 0.1 to 30 parts by mass (However, the total amount of the component (A) and the component (B) is 100 parts by mass.)
An antifoam composition comprising:
[Claim 2]
2. The antifoaming composition according to claim 1, which is for urethane resin paint, epoxy resin paint, flexographic ink, gravure ink or latex.

  The antifoaming composition of the present invention has high antifoaming performance, dispersibility, and paintability for various coating liquids. For example, urethane resin paints, epoxy resin paints, flexographic inks, gravure inks, various latexes. It is useful as an antifoaming agent blended in

The present invention will be described in detail below.
[(A) component]
The organopolysiloxane having a modifying group containing an ester bond group as the component (A) in the present invention is represented by the following general formula (1).

In the above formula, R ¹ is independently a hydroxyl group or a monovalent hydrocarbon group having 1 to 18 carbon atoms, preferably 1 to 12 carbon atoms. Examples of R ¹ include a hydroxyl group; a methyl group, an ethyl group, a propyl group, Isopropyl, butyl, isobutyl, 1-methylpropyl, pentyl, isopentyl, 1-methylbutyl, neopentyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, dodecyl Group, tridecyl group, tetradecyl group, hexadecyl group, octadecyl group and other alkyl groups; cyclopentyl group, cyclohexyl group and other cycloalkyl groups; vinyl group, allyl group and other alkenyl groups; phenyl group and tolyl group and other aryl groups; benzyl Group, an aralkyl group such as a phenethyl group, and the like. Among these, a methyl group is preferable in terms of defoaming performance and availability, and 85 mol% or more of all R ¹ is preferably a methyl group.

で表される分子内にエステル結合基を含有する変性基から選ばれる基である。 R ² is independently R ¹ , a hydrogen atom, an alkoxy group having 1 to 4 carbon atoms, and the following general formula (2)

Is a group selected from a modifying group containing an ester bond group in the molecule.

  Specific examples of the alkoxy group having 1 to 4 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, an isobutoxy group, and a 1-methylpropoxy group.

In said formula (2), X is an oxygen atom or a methylene group.
R ³ is a linear, branched or cyclic divalent hydrocarbon group having 1 to 18 carbon atoms, preferably 1 to 12 carbon atoms. Examples of R ³ include methylene, ethylene, propylene, butylene, pentylene, hexylene, heptylene, octylene, nonylene, decylene, undecylene, dodecylene, tridecylene, tetradecylene, pentadecylene. Group, hexadecylene group, heptadecylene group, octadecylene group and other linear alkylene groups, isopropylene group, isobutylene group, 1-isopropyl-2,2-dimethylpropylene group and other branched alkylene groups, cyclohexylene group, etc. Examples thereof include arylene groups such as a cycloalkylene group, a phenylene group, a tolylene group, a xylylene group, a naphthylene group, and a biphenylene group, and a combination of an alkylene group and an arylene group. Among these, from the viewpoint of antifoaming performance, dispersibility in a coating agent, and paintability, it is preferably a linear or branched alkylene group, particularly a methylene group, an ethylene group, a propylene group, a butylene group, A pentylene group, a hexylene group, and a 1-isopropyl-2,2-dimethylpropylene group are preferred.

であり、本発明の消泡剤組成物に極性を付与することで各種樹脂、ラテックスに対する相溶性を高める効果がある。 E is an ester bond group and binds R ³ and R ⁴ . In particular,

In addition, there is an effect of enhancing the compatibility with various resins and latexes by imparting polarity to the antifoam composition of the present invention.

R ⁴ is a linear, branched or cyclic monovalent hydrocarbon group having 1 to 18 carbon atoms, preferably 1 to 12 carbon atoms. As R ⁴ , for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, 1-methylpropyl group, pentyl group, isopentyl group, 1-methylbutyl group, 2-methylbutyl group, 1,1 -Dimethylpropyl group, neopentyl group, hexyl group, 1-methylpentyl group, 3-methylpentyl group, 1,1-dimethylbutyl group, heptyl group, 1-ethylpentyl group, 1-propylbutyl group, octyl group, 2 -Ethylhexyl group, nonyl group, decyl group, undecyl group, 1-butylheptyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, 1-hexylnonyl group, hexadecyl group, heptadecyl group, 1-heptyldecyl group, 1- (1,3,3-trimethylbutyl) -4,6,6-trimethylheptyl group, oct Linear or branched alkyl group such as decyl group, 1-methylheptadecyl group, nonadecyl group; cycloalkyl such as cyclopentyl group, cyclohexyl group, cycloheptyl group, 1-cyclohexylmethyl group, 2-cyclopentylethyl group Groups: linear groups such as vinyl group, allyl group, 1-methyl-1-butenyl group, 2-methyl-3-butenyl group, 4-undecylene group, 8-pentadecylene group, 8-heptadecylene group, 10-nonadecylene group, etc. Or branched alkenyl groups; aryl groups such as phenyl groups and tolyl groups; aralkyl groups such as benzyl groups and phenethyl groups. Among these, from the viewpoint of antifoaming performance, dispersibility in coating agents, paintability, and availability of raw materials, a linear or branched alkyl group is preferable, and in particular, a methyl group or an ethyl group Propyl group, isopropyl group, butyl group, isobutyl group, 1-methylpropyl group, pentyl group, 1-methylbutyl group, 2-methylbutyl group, heptyl group, 1-ethylpentyl group, 1-propylbutyl group, undecyl group, A pentadecyl group, a 1-hexylnonyl group, a heptadecyl group, a 1-heptyldecyl group, and a 1- (1,3,3-trimethylbutyl) -4,6,6-trimethylheptyl group are preferable.

Here, at least one, preferably 2-5, of the maximum 7 R ² contained in the molecule of the general formula (1) are ester bonds in the molecule represented by the general formula (2). It is a modifying group containing a group.

  m is an integer of 3 to 100, and when m is less than 3, the molecular weight of the component (A) may be too small and the defoaming performance may be deteriorated. When m exceeds 100, the component (A) Since the molecular weight of the coating becomes too large, the dispersibility in the coating agent and the paintability may decrease. Moreover, n is an integer of 0-5, and when n exceeds 5, since the dispersibility of the (A) component with respect to a coating liquid becomes too high, defoaming performance may fall.

Specific examples of the component (A) include the following.

It said organopolysiloxane (A) having a modifying group containing an ester bond groups of component a kinematic viscosity of 10~10,000mm ² / s at 25 ° C. as measured by an Ostwald viscometer, in particular 20～5,000Mm ² / S is preferable.

  The organopolysiloxane having a modifying group containing an ester bond group as the component (A) can be used alone or in combination of two or more.

  Among the organopolysiloxanes having a modifying group containing an ester bond group as the component (A), those in which X is an oxygen atom are organohydrogenpolysiloxanes having a hydrogen atom bonded to a silicon atom (that is, a SiH group). And an alcohol compound having an ester bond group in the molecule can be obtained by dehydrogenation reaction in the presence of a platinum group metal catalyst such as platinum or rhodium or a dehydrogenation catalyst of various alkylamines.

For example, the following reaction examples can be given.

  The platinum group metal catalyst used in the dehydrogenation reaction is preferably a platinum catalyst, and examples thereof include chloroplatinic acid, alcohol-modified chloroplatinic acid, and chloroplatinic acid-vinylsiloxane complex. Alkylamines include monomethylamine, dimethylamine, monoethylamine, diethylamine, diethylhydroxyamine, triethylamine, triethanolamine, monopropylamine, dipropylamine, dipropylhydroxyamine, tripropylamine, monobutylamine, dibutylamine. , Dibutylhydroxyamine, tributylamine, monoheptylamine, monohexylamine, dihexylamine, dihexylhydroxyamine, trihexylamine, monooctylamine, dioctylamine, dioctylhydroxyamine, trioctylamine, monolaurylamine, dilaurylamine, Dilaurylhydroxyamine, trilaurylamine, monostearylamine, distearylamine, distearylhydro Shiamin, mono oleylamine, dioleylamine, dioleyl hydroxylamine, trioleyl amines.

  The use amount of the dehydrogenation reaction catalyst is not particularly limited as long as it is an effective amount. However, the amount of platinum group metal such as platinum or rhodium is not limited to the organohydrogenpolysiloxane and the alcohol compound having an ester bond group in the molecule. Usually, it is preferably 50 ppm or less, more preferably 20 ppm or less, and the lower limit is preferably 0.1 ppm or more, based on mass, with respect to the total amount. Similarly, the amount of alkylamine used is not particularly limited, but is usually 2% by mass or less on a mass basis with respect to the total amount of the organohydrogenpolysiloxane and the alcohol compound having an ester bond group in the molecule. In particular, the content is preferably 1% by mass or less, and the lower limit is preferably 0.01% by mass or more.

  Moreover, you may perform said dehydrogenation reaction in an organic solvent as needed. As the organic solvent, those having no active hydrogen are desirable, for example, aromatic hydrocarbons such as toluene and xylene; aliphatic or alicyclic hydrocarbons such as n-pentane, n-hexane, and cyclohexane; dichloromethane, chloroform, And halogenated hydrocarbons such as carbon tetrachloride. The conditions for the dehydrogenation reaction are not particularly limited, but it is desirable to carry out the reaction for about 1 to 10 hours under reflux.

  On the other hand, among the organopolysiloxanes having a modifying group containing an ester bond group, those in which X is a methylene group include an organohydrogenpolysiloxane having a hydrogen atom bonded to a silicon atom (ie, a SiH group) and A compound having an ester bond group and a compound having an addition-reactive alkenyl group such as a vinyl group or an allyl group at the molecular chain end of a platinum group metal hydrosilylation catalyst such as platinum or rhodium. It can be obtained by addition reaction in the presence.

For example, the following reaction examples can be given.

  The platinum group metal catalyst used in the addition reaction is preferably a platinum catalyst, and examples thereof include chloroplatinic acid, alcohol-modified chloroplatinic acid, and chloroplatinic acid-vinylsiloxane complex. Moreover, you may use sodium acetate, sodium citrate, etc. together as a promoter.

  The amount of hydrosilylation reaction catalyst used is not particularly limited as long as it is an effective amount, but the amount of platinum group metal such as platinum or rhodium is based on the total amount of organohydrogenpolysiloxane and alkenyl group-containing compound. As a standard, it is usually preferably 50 ppm or less, particularly preferably 20 ppm or less, and the lower limit is preferably 0.1 ppm or more.

  Moreover, you may perform said addition reaction in an organic solvent as needed. Examples of the organic solvent include aliphatic alcohols such as methanol, ethanol, 2-propanol and butanol; aromatic hydrocarbons such as toluene and xylene; aliphatic or alicyclic carbons such as n-pentane, n-hexane and cyclohexane. Hydrogen: Halogenated hydrocarbons such as dichloromethane, chloroform, carbon tetrachloride and the like. The addition reaction conditions are not particularly limited, but it is desirable to carry out the reaction for about 1 to 10 hours under reflux.

[Component (B)]
The fine powder silica of the component (B) in the present invention may be a known one, and may be either hydrophilic silica or hydrophobic silica. Examples of the hydrophilic silica include wet silica such as precipitated silica; dry silica such as silica xerogel and fumed silica. Specific examples thereof include Aerosil (registered trademark) [trade name, manufactured by Nippon Aerosil Co., Ltd.], Nip Seal [trade name, manufactured by Tosoh Silica Co., Ltd.], Silicia (registered trademark) [trade name, Fuji Silysia Chemical ( Etc.].

  Examples of the hydrophobic silica include fine powder silica obtained by hydrophobizing the surface of hydrophilic silica with an organic silyl group. The hydrophobizing treatment can be carried out by a conventionally known method, that is, by treating hydrophilic silica with an organosilicon compound such as organochlorosilane, organoalkoxysilane, organodisilazane, organopolysiloxane, organohydrogenpolysiloxane. it can.

Further, the fine powder silica of the component (B) preferably has a specific surface area by the BET method of 50 m ² / g to 700 m ² / g, particularly 100 m ² / g to 500 m ² / g. When the specific surface area is less than 50 m ² / g, a preferable antifoaming performance may not be obtained. When the specific surface area is more than 700 m ² / g, the viscosity of the antifoaming composition may be too high. Moreover, fine powder silica may be used individually by 1 type, or may be used in combination of 2 or more type.

The composition of the present invention comprises (A) 70 to 99.9 parts by mass, preferably 80 to 99 parts by mass, and (B) 0.1 to 30 parts by mass, preferably 1 to 20 parts by mass. (However, the total amount of the component (A) and the component (B) is 100 parts by mass).
When the amount of the component (A) is less than 70 parts by mass and the amount of the component (B) exceeds 30 parts by mass, the viscosity of the resulting composition tends to increase, and when added to workability or a coating agent When the amount of the component (A) exceeds 99.9 parts by mass and the amount of the component (B) is less than 0.1 parts by mass, the defoaming performance of the resulting composition is low. Inferior.

  In the production method of the present invention, examples of the kneader used for kneading the component (A) and the component (B) include a gate mixer, a kneader, and a biaxial kneader, but are not particularly limited. Moreover, it can also heat at the time of kneading | mixing as needed.

The antifoaming composition obtained by kneading the above components is used as it is, or HO— [CH ₂ (CH ₃ ) CHO] ₃₅ —H,
HO— [CH ₂ (CH ₃ ) CHO] ₇₀ —H,
HO— (CH ₂ CH ₂ O) ₄ — [CH ₂ (CH ₃ ) CHO] ₃₀ —H,
_{CH 2 = CHCH 2 O- (CH} 2 CH 2 O) 32 - [CH 2 (CH 3) CHO] 8 -H,
_{CH 2 = CHCH 2 O- (CH} 2 CH 2 O) 22 - [CH 2 (CH 3) CHO] 22 -C 4 H 9,
_{CH 2 = CHCH 2 O- (CH} 2 CH 2 O) 10 -CH 3
A polyoxyalkylene polymer such as exemplified by sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester, propylene glycol fatty acid ester, sucrose fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene oxypropylene alkyl ether, Mix with nonionic surfactant such as polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene propylene glycol fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil May be used. In addition, the composition formula and nonionic surfactant of the polyoxyalkylene polymer which were illustrated above are examples, and do not restrict | limit this invention.

  When the antifoam composition of the present invention is used by mixing with the nonionic surfactant, 0.1 to 300 parts by mass of the nonionic surfactant is used with respect to 100 parts by mass of the antifoam composition. It is particularly preferable to mix 5 to 100 parts by mass.

  The antifoaming composition of the present invention is useful as an antifoaming agent blended in various coating liquids, for example, urethane resin paints, epoxy resin paints, flexographic inks, gravure inks, various latexes, etc. It is preferable to add 0.001-5 mass% of the antifoamer composition of this invention with respect to a coating liquid, especially 0.01-1 mass%.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to these Examples. In the following examples, the viscosity is a kinematic viscosity at 25 ° C. measured with an Ostwald viscometer.

（粘度：３００ｍｍ²／ｓ、淡黄色透明液体）
これを、「Ａ１」とする。 The following were used as the component (A).

(Viscosity: 300 mm ² / s, pale yellow transparent liquid)
This is referred to as “A1”.

（粘度：２００ｍｍ²／ｓ、淡黄色透明液体）
これを、「Ａ２」とする。

(Viscosity: 200 mm ² / s, pale yellow transparent liquid)
This is designated as “A2”.

（粘度：４０ｍｍ²／ｓ、淡黄色透明液体）
これを、「Ａ３」とする。

(Viscosity: 40 mm ² / s, pale yellow transparent liquid)
This is designated as “A3”.

（粘度：１，２００ｍｍ²／ｓ、淡黄色透明液体）
これを、「Ａ４」とする。

(Viscosity: 1,200 mm ² / s, pale yellow transparent liquid)
This is designated as “A4”.

（粘度：２，２００ｍｍ²／ｓ、淡黄色透明液体）
これを、「Ａ５」とする。

(Viscosity: 2,200 mm ² / s, pale yellow transparent liquid)
This is designated as “A5”.

（粘度：１，８００ｍｍ²／ｓ、淡黄色透明液体）
これを、「Ａ６」とする。

(Viscosity: 1,800 mm ² / s, pale yellow transparent liquid)
This is designated as “A6”.

Dimethylpolysiloxane (viscosity: 3,000 mm ² / s, colorless transparent liquid)
This is designated as “A7”.

As the component (B), the following were used.
Aerosil R812 [trade name, manufactured by Nippon Aerosil Co., Ltd., BET specific surface area 260 m ² / g]
This is referred to as “B1”.

Nip seal SS-10F [trade name, manufactured by Tosoh Silica Co., Ltd., BET specific surface area 90 m ² / g]
This is designated as “B2”.

[Examples 1-6, Comparative Examples 1-8]
A composition was prepared by mixing the component (A) and the component (B) at the quantitative ratios shown in Table 1. Comparative Example 1 is an example in which only the component (A) is used without using the component (B). Comparative Example 2 is an example in which the component (B) is not used and only the non-regulated component (A) is used. Comparative Examples 3 to 8 are examples using a component (A) that is not specified.

[Performance evaluation]
0.5 mass% of antifoaming agent compositions of Examples 1 to 6 and Comparative Examples 1 to 8 were added to a commercially available urethane resin paint, and the performance evaluation shown below was performed. The evaluation results are shown in Table 2.

<Defoaming performance>
The number of foams on the surface of the coating film when the urethane resin paint to which the antifoam composition was added was roller-coated on a stainless steel plate was counted and evaluated according to the following criteria.
○: 2 or less, Δ: 3-10, ×: 11 or more

<Dispersibility>
The urethane resin paint to which the defoamer composition was added was placed in a glass bottle, and the presence or absence of separation was visually observed when stirred with a centrifuge at 5,000 rpm × 10 minutes, and evaluated according to the following criteria.
○: No separation, △: Slight separation, ×: Separation

<Paintability>
The urethane resin paint to which the antifoaming agent composition was added was roller-coated on a stainless steel plate, and the paintability was confirmed using a magic pen on the surface of the dried coating film, and evaluated according to the following criteria.
○: No repelling, △: Slight repelling, ×: Repelling

[Evaluation]
As is clear from the results in Table 2, the antifoaming composition of the present invention is excellent in antifoaming performance, dispersibility, and paintability when added to a coating solution.

Claims (2)

(A) The following general formula (1)

[Wherein, R ¹ is independently a hydroxyl group or a monovalent hydrocarbon group having 1 to 18 carbon atoms, and R ² is independently the following general formula (2)

(In the formula, X is an oxygen atom or a methylene group, R ³ is a divalent hydrocarbon group having 1 to 18 carbon atoms, and E is an ester bond group [—C (═O) —O— or —O]. —C (═O) —], and R ⁴ is a monovalent hydrocarbon group having 1 to 18 carbon atoms.
A modified group containing an ester bond group in the molecule represented by the above, R ¹ , a hydrogen atom, or an alkoxy group having 1 to 4 carbon atoms, provided that it is contained in the molecule of the general formula (1). At least one of R ² is a modifying group containing an ester bond group in the molecule represented by the general formula (2). m is an integer of 3 to 100, and n is an integer of 0 to 5. ]
An organopolysiloxane having a modifying group containing an ester bond group represented by: 70 to 99.9 parts by mass,
(B) Fine powder silica: 0.1 to 30 parts by mass (However, the total amount of the component (A) and the component (B) is 100 parts by mass.)
An antifoam composition comprising:   2. The antifoaming composition according to claim 1, which is for urethane resin paint, epoxy resin paint, flexographic ink, gravure ink or latex.