JP2685688B2 - Foam suppressor composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention provides a foam inhibitor composition, and particularly excellent dilution stability and defoaming durability, and causes uneven dyeing even in high-temperature processing in the dyeing industry and the like, and processing using dyes. The present invention relates to a foam inhibitor composition that is useful as an antifoaming agent for dyeing.

[0002]

2. Description of the Related Art Regarding the defoaming agent, since the silicone-based defoaming agent 4 containing dimethylpolysiloxane as a main component has various excellent properties as compared with other defoaming agents, the general chemical industry It is used in a wide range of processes involving foaming.

Since this dimethylpolysiloxane is essentially hydrophobic, it is practically used as an emulsion type defoaming agent prepared by dispersing it in water using a surfactant. However, also in this case, when the liquid to be treated is at a high temperature or a high shearing force is applied, the desired defoaming effect cannot be expected because the emulsion is destroyed, and sometimes foaming is promoted. However, this may also be accompanied by the disadvantage that the emulsion separates during long-term storage, and in the dyeing industry, the water repellency of the separated dimethylpolysiloxane causes uneven dyeing on the object to be treated. .

[0004]

Therefore, it has been proposed to use an organopolysiloxane modified with a polyoxyalkylene group as the defoaming agent (see US Pat. No. 3,233,986). However, this has the disadvantage that the defoaming effect and defoaming effect are small. Therefore, regarding this, a hydrophilic polysiloxane represented by dimethylpolysiloxane modified with polyoxyalkylene is used as the base oil, and dimethylpolysiloxane is added to this. It has also been attempted to improve the defoaming effect by using an oil compound composed of diorganopolysiloxane represented by the formula (1) and finely divided silica (Japanese Patent Publication No.
No. 9836, Japanese Patent Publication No. 52-22638, Japanese Patent Publication No. 55-23084), those using long-chain alkyl groups and polyoxyalkylene co-modified organopolysiloxanes as base oils have also been proposed (Japanese Patent Publication No. 58-58126). (See the official gazette).

However, when these are also used in the dyeing industry, a high temperature or mechanically strong shearing force is applied for a long time, so that the hydrophobic oil compound component causes agglomeration, which causes the treated material to be treated. There is a disadvantage that uneven dyeing occurs on the product. Therefore, for the defoaming agent used in the dyeing step usually performed at high temperature, the molar ratio of ethyleneoxy group of polyoxyalkylene group in the polyoxyalkylene group-containing organopolysiloxane used here is increased to Although it is also proposed to prevent the agglomeration in the above, increasing the mole fraction of the ethyleneoxy group reduces the dispersibility of the diorganopolysiloxane and the finely divided silica, and this dilute stability, The mechanical stability and the high temperature stability are also deteriorated, resulting in lack of practicality. Therefore, the present inventors have proposed a suds suppressor composition in which the above-mentioned drawbacks are improved by using the previously limited polyoxyalkylene-modified silicone oil (see Japanese Patent Application No. 2-414678). With respect to, the characteristics are required to be further improved.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a foam suppressor composition capable of solving the above problems, which comprises A) the general formula (1)

Embedded image [Wherein G ¹ is a group selected from R ¹ , G ² or G ³ , G ² , G ³
Molecular weight 500 to 3,000 wherein the _{(CH 2) r -O- (R} 2 O) s -Q (R 2 is an ethylene group and a propylene group, Q is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, an acetyl group , A monovalent organic group selected from isocyanic acid groups, r is 2 to 6 and s is 5 to 5
In the group represented by 0), G ² is (R ² O) ethylene group is 10 to 30 mol% in group, G ³ is (ethyleneoxy groups in R ² O) groups is 65 to 85 mol% are those, G ² / G ³ (molar ratio) is 0.3 / 1
~ 3/1, R ¹ is a monovalent hydrocarbon group having 3 to 20 carbon atoms,
a is 0 or 1, m and n are 1 to 30, p is 10 to 100,
q is a positive number from 1 to 10] 30 to 80% by weight of polyoxyalkylene-modified silicone oil,

B) General formula (2)

Embedded image [Wherein R ³ is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, R ⁴ is R ³ or a hydroxyl group, and R ⁵ is a formula —R ⁶ (NHCH ₂ CH
₂ ) _b NR ⁷ R ⁸ (R ⁶ is a divalent hydrocarbon group having 1 to 4 carbon atoms, R ⁷ ,
R ⁸ is a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, b is an aminoalkyl group represented by 0 ≦ b ≦ 4), k is a positive number from 10 to 5,000, and l Is 0.01
~ 500 positive number], the amine equivalent is 5,000 to 500,
A foam inhibitor component consisting of 100 parts by weight of a linear aminoalkyl-modified silicone oil having a viscosity of 10 to 100,000 cS at 25 ° C and 1 to 40 parts by weight of finely divided silica 5 to 50% by weight

C) The molecular weight range is 500 to 3,000 and the ethyleneoxy group is
Polyoxyethylene-polyoxypropylene copolymer of 10 to 85 mol% 5 to 50 parts by weight D) Viscosity at 25 ° C of 10 to 500 cS Dimethyl silicone with both ends of the molecular chain blocked with monohydroxydimethylsilyl groups Oil 2-20% by weight,
It consists of and.

That is, the inventors of the present invention have conducted various studies as to how to solve the disadvantages of the defoaming agent containing a conventionally known polyoxyalkylene-modified organopolysiloxane as a main component, and as a result, the polyoxyalkylene-modified organopolysiloxane The amount of ethyleneoxy groups and propyleneoxy groups contained in and the molar ratio thereof are specified, and the foam suppressor consisting of the aminoalkyl-modified silicone oil and fine powder silica, which is limited to this, and the ethyleneoxy groups When a polyoxyethylene-polyoxypropylene copolymer having a specified amount and a dimethyl silicone oil having a molecular chain end blocked with a monohydroxydimethylsilyl group are added, the foam inhibitor thus obtained has a dilution stability and a disappearance. It has excellent foam durability and high temperature stability. Out was.

Further, as compared with the polysiloxane modified with a single polyoxyalkylene, a polysiloxane containing two kinds of polyoxyalkylene in the same molecule as described above is used, and the foam inhibitor component is used. When a specific aminoalkyl-modified silicone oil is added to, the resulting foam inhibitor composition exhibits excellent defoaming durability and foam breaking property, and the emulsion is not broken even under high temperature and high shear, and oil spots and Since no agglomerates are generated, it was confirmed that this product does not cause uneven dyeing even when used for the dyeing industry, and research was conducted on the types and mixing ratios of each of the above-mentioned components. Completed the invention. This will be described in more detail below.

[0011]

The present invention relates to a foam inhibitor composition which is particularly useful in the dyeing industry and the like because of its excellent dilution stability, defoaming durability and high temperature stability, and this foam inhibitor composition Is A) a polyoxyalkylene-modified silicone oil represented by the above-mentioned general formula (1), B) a suds suppressor component comprising an aminoalkyl-modified silicone oil represented by the above-mentioned general formula (2) and fine powder silica, C ) A polyoxyethylene-polyoxypropylene copolymer and D) a molecular chain terminal hydroxyl group dimethyl silicone are mixed in a predetermined amount.

The polyoxyalkylene-modified silicone oil as the component A) constituting the foam control composition of the present invention is represented by the above-mentioned general formula (1).
G ¹ in (1) is selected from R ¹ , G ² or G ³ , and either or both of them may be used, and G ² and G ³ are represented by the formula (CH ₂ ) _r- O- (R ² O) _s -Q, R ² is an ethylene group and a propylene group, r is 2 to 6,
Preferably, 2 to 3, s is 5 to 50, preferably 15 to 45, but G ² is an ethyleneoxy group in the (R ² O) group.
10 to 30 mol%, G ³ has an ethyleneoxy group of 65 in the (R ² O) group.
~ 85 mol% is required. This G ² ,
When the average molecular weight of G ³ is less than 500, the effect of the alkyleneoxy group as a hydrophilic group is not sufficiently exerted, and when it exceeds 3,000, the viscosity becomes too high and the dispersibility and workability deteriorate, so the range of 500 to 3,000 is used. , Preferably 1,000 to 2,000. Regarding G ² and G ³ , when G ² / G ³ (molar ratio) in the formula is less than 0.3, the hydrophobic portion increases and the dispersibility deteriorates, and when it exceeds 3, the defoaming property deteriorates. , 0.3 to 3 is required.

In the above, Q is selected from a hydrogen atom, an alkyl group having 1 to 8 carbon atoms such as a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group and an octyl group, an acetyl group and an isocyanic acid group. R ¹ is a monovalent hydrocarbon group, but R ¹ is a monovalent hydrocarbon group, but if the carbon number exceeds 20, the defoaming property and the water dispersibility deteriorate, so the carbon number is 3 to 20.
When m and n are positive numbers of 1 to 30 and m + n is 3 to 40, preferably 3 to 20, and p is less than 10, the defoaming property becomes poor and the viscosity of The storage stability deteriorates due to the decrease, and when it exceeds 100, the viscosity at the time of dilution becomes high and the workability deteriorates, so 10 to 100, preferably 20
-60, and q is a positive number from 1 to 10, which is the content of the hydrophobic portion represented by siloxane in the molecule, that is, from the total molecular weight to G ² , G ³ The amount excluding the molecular weight of is preferably 5 to 30% by weight.

This polyoxyalkylene-modified silicone oil can be synthesized by a conventionally known method. For example, two kinds of methylpolysiloxane containing ≡SiH group and vinyl group or allyl group at the end of the molecular chain are used. The above polyoxyalkylene compound and an unsaturated olefin having 3 to 20 carbon atoms are subjected to an addition reaction in the presence of a platinum catalyst, or an organopolysiloxane containing an ≡SiH group and an R ¹ group is added with a vinyl group or The foam inhibitor composition of the present invention can be easily obtained by addition reaction of two or more polyoxyalkylene compounds having an allyl group, etc.
If the content of component A) in 00% by weight is less than 30% by weight, the water dispersibility is poor, and if it is more than 80% by weight, it is difficult to form a uniform and stable self-emulsifying emulsion.
It may be in the range of -80 wt%, more preferably 50-70 wt%.

Next, the foam control composition of the present invention is constituted.
The foam suppressor component as the component (B) is a main component for imparting antifoam persistence to the foam suppressor composition of the present invention,
This is composed of aminoalkyl-modified silicone oil and finely divided silica. This aminoalkyl-modified silicone is represented by the above-mentioned general formula (2), and R ³ in the general formula (2) is a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, an octyl group, Bond to alkyl group such as decyl group, dodecyl group, octadecyl group, alkenyl group such as vinyl group and allyl group, aryl group such as phenyl group and tolyl group, cycloalkyl group such as cyclohexyl group, or carbon atom of these groups Some or all of the hydrogen atoms that are substituted with a halogen atom, a cyano group, etc., a chloromethyl group, a chloropropyl group,
An unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, selected from a trifluoropropyl group, a cyanoethyl group, etc., preferably 90 mol% or more is a methyl group, R ⁴
Is the same as R ³ or a hydroxyl group, and R ⁵ is of the formula -R ⁶ (NHCH ₂ CH ₂ ) _b NR ⁷
Represented by R ^8, R ⁶ is a methylene group, dimethylene group, trimethylene group, tetramethylene group, preferably a divalent hydrocarbon group having 1 to 4 carbon atoms is a trimethylene group, R ^7, R ⁸ is or each hydrogen atom It is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, which is the same as R ³ described above, and b is 0 ≦ b ≦
An aminoalkyl group that is 4, k is a positive number between 10 and 5,000,
It has a linear structure in which l is a positive number of 0.01 to 500, and is preferably one in which R ³ is blocked with a trimethylsilyl group or a monohydroxydimethylsilyl group which is a methyl group or a hydroxyl group.

If the amine equivalent is less than 5,000 or more than 500,000, the antifoam composition obtained has poor dilution stability, and troubles may occur during dyeing. It is required to be in the range of 500,000, but preferably in the range of 10,000 to 100,000. In addition, it is preferable that the viscosity be as low as possible from the viewpoint of ease of dispersion and workability, and it is better that the viscosity is high from the viewpoint of defoaming durability, but if the viscosity is less than 10 cS. The obtained composition has poor stability, and when it is more than 100,000 cS, the viscosity increase becomes remarkable when the composition is diluted with water before it is used as a suds suppressor composition, resulting in difficulty in workability. So
The range is 10 to 100,000 cS, preferably 100 to 5,000 cS.

Further, the finely divided silica used here may be a known one, and may be either wet silica or dry silica. Therefore, precipitated silica, silica xerogel, fumed silica, or its surface may be used. Those treated with an organic silyl group are shown. Specifically, Aerosil [trade name of Nippon Aerosil Co., Ltd.], Nipsil [trade name of Nihon Silica Co., Ltd.], Cabosil [trade name of Cabot Co., USA], Santocell [trade name, manufactured by Monsanto Chemical Co., USA] and the like are mentioned, and it is preferable that these have a specific surface area of 100 m ² / g or more as measured by the BET method.

This finely divided silica is preferably hydrophobized in order to improve the dilution stability and defoaming properties of the desired foam suppressor composition. This hydrophobization treatment method uses this silica as an organosilane. Alternatively, the treatment may be carried out by either a dry treatment method in which it is mixed with a silazane compound and heat treated, or a wet treatment method in which the above-mentioned aminoalkyl-modified silicone oil and the above silica and organic silane and a silazane compound are mixed and heat-treated.

The organic silanes and silazane compounds used at this time are trimethylchlorosilane, methyltrichlorosilane, dimethylphenylchlorosilane, phenyltrichlorosilane, methyltrimethoxysilane,
Examples include methyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, and hexamethyldisilazane.

If the compounding ratio of this aminoalkyl-modified silicone oil and fine powder silica is less than 1 part by weight of fine powder silica per 100 parts by weight of aminoalkyl-modified silicone oil, the defoaming performance will be inferior, and 40 parts by weight will result. If it is more than 1 part by weight, the viscosity of the composition increases and the water dispersibility and workability deteriorate, so 1 to 40 parts by weight, more preferably 5 to
20 parts by weight may be blended, but if the blending amount of this product with respect to the foam inhibitor composition is too large or too small, the defoaming performance will not be sufficiently exhibited, and if it is too large, it will thicken and workability will increase. Is 100% by weight of the composition.
The amount may be 50% by weight, more preferably 10 to 30% by weight.

Further, the polyoxyethylene-polyoxypropylene copolymer as the component C) which constitutes the foam suppressor composition of the present invention is obtained by emulsifying and dispersing the components A) and B) and the component D) described later. However, if the molecular weight is less than 500, the resulting composition will have poor stability over time, and if it exceeds 3,000, the viscosity will increase and the dispersibility will be affected. , Having a molecular weight in the range of 500 to 3,000, preferably 1,500 to 2,50
Must be zero.

It should be noted that when the ethyleneoxy group contained here is less than 10 mol%, the hydrophobicity becomes strong and the function as an emulsification aid becomes insufficient, and when it exceeds 85 mol%.
Since the HLB becomes too large and the function as an emulsification aid cannot be fully exerted in this case, the content of ethyleneoxy groups is in the range of 10 to 85 mol%, preferably 30 to 70 mol%. It is required, but if the content of this product in 100% by weight of the foam suppressor composition is less than 5% by weight, the storage stability becomes poor, and if it exceeds 50% by weight, the dilution stability of the composition becomes poor. So this is 5-50
The amount may be in the range of 10% by weight, more preferably 10 to 30% by weight.

The dimethyl silicone oil as the component D) constituting the foam control composition of the present invention is such that both ends of the molecular chain are blocked with monohydroxydimethylsilyl groups. This is A) as described above in the foam control composition of the present invention.
It is said to be effective as a binder for the component and B) component,
Originally little compatibility with monohydroxydimethylsilyl group
It has a function of lowering the interfacial tension between the components A) and B) and improves the compatibility of these components, but this one causes an oil spot when the viscosity is less than 10 cS, and it causes 500 cS
If the viscosity is higher, the viscosity cannot be lowered and the effect of addition is insufficient. Therefore, in order not to increase the viscosity of this foam inhibitor composition, the viscosity should be 10 to 500 cS, preferably 30 to 200 cS. Is needed.

If the content of this product in 100% by weight of the foam suppressor composition is less than 2% by weight, the above effect is not sufficiently exhibited, and if it is more than 20% by weight, the viscosity becomes too low and the silica content precipitates. Since the storage stability becomes poor, for example, it may be 2 to 20% by weight, and more preferably 5 to 15% by weight.

The foam control composition of the present invention comprises the above-mentioned A) to
It can be obtained by mixing a predetermined amount of component D). This can be achieved by uniformly mixing each of these components using a mixer such as a homomixer, and the mixing order is not particularly limited, You may heat at 40-150 degreeC at the time of mixing.

The foam inhibitor composition of the present invention thus obtained imparts an excellent low foaming property to the liquid to which it is added for a long period of time, and it is mechanically stable under high temperature and high shear. Since it has excellent properties and does not cause agglomeration, it is useful as an antifoaming agent for high-temperature dyeing, and it is possible to avoid troubles such as uneven dyeing due to the defoaming agent in various dyeing processes. The advantage is given.
Since it has excellent stability and can be used in combination with various chemicals, it can be suitably used as an internal antifoaming agent for various oil agents, general paints, water-based cutting oils and the like.

[0027]

EXAMPLES Examples of the present invention and comparative examples will now be described.
The viscosity in the examples is the value measured at 25 ° C., and the various physical properties are the values measured by the following test methods.

(Dilution Stability Test Method) 10 of foam control composition
% 100% aqueous solution in a 200 ml glass beaker at 25 ℃
The temporal stability after storage for one day was visually evaluated as follows. ⊚: Good emulsion and oil floating are not observed. ◯: There is some oil floating or silica sedimentation. Δ: A large amount of oil floats and a large amount of silica sedimentation.

(Dyeing test method) Dye / S-BGU [trade name of HOECHST] 0.1 g, dyeing aid / Emar NC-35 [Kao Corporation]
Brand name] 4 g, acetic acid 4 g, 2 g of an aqueous solution containing 10 g of a foam inhibitor composition was used to dye 10 g of polyester cloth at 135 ° C. for 10 minutes with a high temperature dyeing machine (JF type) manufactured by Matisse, The uneven dyeing was evaluated. A: No uneven dyeing was observed. ◯: Equal to the blank, although there was some dyeing unevenness.

Example 1 Formula

Embedded image 650g of polyoxyalkylene-modified silicone oil with a viscosity of 950cS as the component A

Embedded image 900g of aminoalkyl-modified silicone oil with a viscosity of 301cS (amine equivalent 32,000), 100g of wet silica with an average particle size of 1.4μm and a specific surface area of 300m ² / g
Further, 60 g of hexamethyldisilazane was heat-treated in a glass 2 liter flask under a nitrogen gas stream at 150 ° C. for 3 hours and mixed and stirred with a homomixer to obtain 150 g of the component B.

Expression

Embedded image The component C is 150 g of polyoxyethylene-polyoxypropylene copolymer having a viscosity of 250 cS, the viscosity is 50 cS, and both ends of the molecular chain are blocked with monohydroxydimethylsilyl groups. 80 g of linear dimethyl silicone oil was used as the component D, and the components A to D were stirred with a homomixer for 5 to 10 minutes to prepare a suds suppressor composition (a).

Example 2 Components A, C and D used are the same as in Example 1, and the component B is of the formula

Embedded image And using an aminoalkyl-modified silicone oil (amine equivalent 14,000) having a viscosity of 326 cS,
The components were treated in the same manner as in Example 1 to prepare a suds suppressor composition (b).

Example 3 Components A, C and D used are the same as in Example 1, and the component B is of the formula

Embedded image And an aminoalkyl-modified silicone oil having a viscosity of 330 cS (amine equivalent 100,000) was used.
A foam inhibitor composition (C) was prepared from component D by the same method as in Example 1.

Example 4 Formula

Embedded image 650 g of polyoxyalkylene-modified silicone oil having a viscosity of 920 cS is used as the A component, and the components B, C and D are
Is the same as that of the first embodiment.
The ingredients were treated in the same manner as in Example 1 to make a suds suppressor composition (d).

Example 5 Formula

Embedded image 650 g of polyoxyalkylene-modified silicone oil having a viscosity of 900 cS is used as the A component, and the components B, C, and D are
Is the same as that of the first embodiment.
The ingredients were treated in the same manner as in Example 1 to make a suds suppressor composition (e).

Comparative Example 1 Components A, C and D are the same as those used in Example 1, and the B component is represented by the formula.

Embedded image And an aminoalkyl-modified silicone oil having a viscosity of 250 cS (amine equivalent 4,500) was used.
A foam control composition (f) was prepared from the ingredients in the same manner as in Example 1.

Comparative Example 2 Components A, C and D were the same as those used in Example 1, and component B was dimethyl silicone oil having a viscosity of 300 cS. A foam inhibitor composition (g) was prepared in the same manner.

Suds suppressor test The suds suppressor compositions (a)-(g) prepared in Examples 1-5 and Comparative Examples 1-2 were placed in a 1,000 cc tall beaker.
When 0.1 g was added to 100 ml of 0.2% sodium oleate aqueous solution and the amount of foaming was measured after 20 minutes when bubbling air through the glass diffuser stone at 1 liter / minute, the foam height was 150 ml in all cases. It was below and showed excellent defoaming property. Further, when the foaming inhibitor compositions (a) to (g) were examined for their dilution stability and dyeability, the results shown in Table 1 were obtained.

[0039]

[Table 1]

[0040]

The present invention relates to a suds suppressor composition, which comprises A) a polyoxyalkylene-modified silicone oil represented by the general formula (1) and B) a general formula.
(2) A foam suppressor component consisting of an aminoalkyl-modified silicone oil and finely divided silica, C) a polyoxyethylene-polyoxypropylene copolymer, and D) a molecular chain end blocked with a monohydroxydimethylsilyl group. It is characterized by comprising dimethyl silicone oil, which is superior in dilution stability, defoaming durability and high temperature characteristics to the conventionally known silicone-based defoaming agents. Since it does not cause dyeing unevenness even when used in, the industrial advantage of being useful as an antifoaming agent for dyeing is provided.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C08L 83/08 LRX C08L 83/08 LRX 83/12 LRY 83/12 LRY (72) Inventor Satoshi Kuwata Gunma Prefecture, Usui-gun, Matsuida-cho, Hitomi 1-10, Shin-Etsu Chemical Co., Ltd. Silicone Electronic Materials Research Laboratory (56) Reference JP-A-3-157106 (JP, A)

Claims (1)

(57) [Claims] 1. A) General formula: ## STR1 ## [Wherein G ¹ is a group selected from R ¹ , G ² or G ³ , G ² , G ³
Is a formula (CH ₂ ) _r -O (R ² O) _s -Q with a molecular weight of 500 to 3,000 (R ² is an ethylene group and a propylene group, Q is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, an acetyl group, Monovalent organic group selected from isocyanic acid group, r is 2 to 6 and s is 5 to 50)
In the group represented by, G ² is an ethyleneoxy group in the (R ² O) group.
10 to 30 mol%, G ³ has an ethyleneoxy group of 65 in the (R ² O) group.
Is of 85 mol%, G ² / G ³ (molar ratio) is 0.3 / 1 to 3 /
1, R ¹ is a monovalent hydrocarbon group having 3 to 20 carbon atoms, a is 0 or 1, m and n are positive numbers from 1 to 30, p is 10 to 100, and q is a positive number from 1 to 10] Polyoxyalkylene-modified silicone oil represented by 30 to 80% by weight B) General formula: [Wherein R ³ is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, R ⁴ is R ³ or a hydroxyl group, R ⁵ is a formula —R ⁶ (NHCH ₂ CH
₂ ) _b NR ⁷ R ⁸ (R ⁶ is a divalent hydrocarbon group having 1 to 4 carbon atoms, R ⁷ ,
R ⁸ is a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, b is an aminoalkyl group represented by 0 ≦ b ≦ 4), k is a positive number of 10 to 5,000, and l Is 0.01
~ 500 positive number], the amine equivalent is 5,000 to 500,
A foam inhibitor component consisting of 100 parts by weight of a linear aminoalkyl-modified silicone oil having a viscosity of 10 to 100,000 cS at 25 ° C and 1 to 40 parts by weight of finely divided silica 5 to 50% by weight, C) It has a molecular weight range of 500 to 3,000 and contains ethyleneoxy groups.
10 to 85 mol% of polyoxyethylene-polyoxypropylene copolymer 5 to 50 wt%, D) Viscosity at 25 ° C is 10 to 500 cS, dimethyl having both molecular chain ends blocked with monohydroxydimethylsilyl groups. A foam inhibitor composition comprising 5 to 20% by weight of silicone oil.