JPH05261207A - Foam inhibitor composition - Google Patents

Abstract

PURPOSE:To obtain a foam inhibitor composition excellent in dilution stability or the like by mixing respectively a specified quantity of a blended material of a specific polyoxyalkylene modified silicone oil with dimethylpolysilxane oil or the like, polyoxyethylene-polyoxypropylene copolymer and dimethylpolysiloxane oil. CONSTITUTION:This foam inhibitor composition contains 30-80wt.% polyoxyalkylene modified silicone oil expressed by formula I, 5-50wt.% blended material of 100 pts.wt. dimethylpolysiloxane having 10-100000cS viscosity at 25 deg.C with 1-10 pts.wt. siloxane resin, 1-40 pts.wt. particulate silica, 5-50wt.% polyoxyethylene-polyoxypropylene copolymer having 500-3000 molecular weight and containing 10-85mol.% ethylene oxide group and 2-20wt.% dimethylpolysiloxane having 10-500cS viscosity at 25 deg.C and the both terminals of which are sealed with monohydroxy dimethyl silyl groups.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suds suppressor composition, and more particularly to a suds suppressor composition which exhibits excellent dispersion stability and suds suppressibility when added to an aqueous cutting oil, an oil agent for dyeing process and the like. It is a thing.

[0002]

2. Description of the Related Art Silicone defoaming agents containing dimethylpolysiloxane as a main component have various excellent properties as compared with other defoaming agents. Widely used in the process. However, since this dimethylpolysiloxane is essentially hydrophobic, it is used as an emulsion type defoaming agent in which it is dispersed in water using a surfactant. When the liquid to be treated is at a high temperature or subject to high shearing, the desired defoaming effect cannot be expected because the emulsion is broken, and sometimes foaming is promoted. Also has the drawback that it cannot be used in non-aqueous systems and that the emulsion separates during long-term storage.

Therefore, it has been proposed to use an organopolysiloxane modified with a polyoxyalkylene group as the antifoaming agent (US Pat. No. 3,233,986).
However, this has the disadvantage of having a small effect of defoaming and defoaming. A hydrophilic polysiloxane represented by dimethylpolysiloxane modified with polyoxyalkylene is used as a base oil, and dimethylpolysiloxane is added to the base oil. It has also been proposed to improve the defoaming effect by using an oil compound composed of finely powdered silica (Japanese Patent Publication No. 52-19836, Japanese Patent Publication No. 52-22638, and Japanese Patent Publication No. 55-230).
No. 84), a long-chain alkyl group and a polyoxyalkylene co-modified organopolysiloxane are also proposed as base oils (see Japanese Examined Patent Publication No. 58-58126), but these are not the case with fine powder silica alone. Is difficult to stably disperse in dimethylpolysiloxane, when high temperature or mechanically strong shearing force is applied for a long time,
There is a disadvantage that silica aggregates or separates during dilution or long-term storage.

[0004]

Therefore, in order to improve the dispersibility of dimethylpolysiloxane and silica,
It has been proposed to subject the silica surface to a silazane treatment to make it hydrophobic, but in this case, the defoaming property may be lowered depending on the treatment amount, and this is disadvantageous in that this adjustment is difficult. Regarding the defoaming agent, the present inventors also limited polyoxyalkylene-modified organopolysiloxane, a foam inhibitor component composed of dimethyl silicone oil and fine powder silica, polyoxyethylene-polyoxypropylene copolymer and We have proposed a foam suppressor consisting of dimethyl silicone oil in which both ends of the molecular chain are blocked with hydroxyl groups (see Japanese Patent Application No. 2-414678), which can solve the above-mentioned drawbacks considerably. Although you can
This still has the disadvantage that the dispersibility and defoaming properties of silica are insufficient.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a foam control agent which solves these disadvantages, which is represented by A) the general formula

[Chemical 2] [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 having 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 in the (R ² O) group of 65
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 1
~ 10 positive number] polyoxyalkylene-modified silicone oil 30 to 80% by weight B) Viscosity at 25 ℃ is 10 to
It consists essentially of 100 parts by weight of 100,000 cS dimethylpolysiloxane, (CH ₃ ) ₃ SiO _1/2 units and SiO ₂ units, with a (CH ₃ ) ₃ SiO _1/2 / SiO ₂ ratio of 0.4 / 1 to 10 parts by weight of a siloxane resin in the range of 1 to 1.3 / 1 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 10 ~ 85
5% to 50% by weight of polyoxyethylene-polyoxypropylene copolymer, which is mol%, D) the viscosity at 25 ° C is 10 to 50%.
It is characterized by comprising 2 to 20% by weight of dimethylpolysiloxane in which both ends of the molecular chain of 0 cS are blocked with monohydroxydimethylsilyl groups.

That is, the present inventors have conducted various studies on methods for solving the disadvantages of the defoaming agent containing a conventionally known polyoxyalkylene-modified organopolysiloxane as a main component, and as a result, this polyoxyalkylene-modified organopolysiloxane The amount of ethyleneoxy groups and propyleneoxy groups contained in and the molar ratio thereof are specified, and the compound consisting of dimethylpolysiloxane, siloxane resin and fine powder silica and the amount of ethyleneoxy groups are specified. When the polyoxyethylene-polyoxypropylene copolymer described above and a linear dimethylpolysiloxane whose molecular chain end is blocked with a monohydroxydimethylsilyl group are added, the foam inhibitor thus obtained has a dilution stability and a quenching effect. It has excellent foam stability and high temperature stability. Out was.

Further, when a polysiloxane containing two kinds of polyoxyalkylenes in the same molecule as described above is used as compared with a polysiloxane modified with a single polyoxyalkylene, this product is excellent in dilution. It was confirmed that when siloxane resin was added to the compound consisting of dimethylpolysiloxane and powdered silica, it exhibited excellent defoaming durability and defoaming property, as well as stability and high temperature stability. The present invention has been completed by proceeding with research on types, compounding ratios, and the like. This will be described in more detail below.

[0008]

The present invention relates to a foam inhibitor composition which is particularly useful for an aqueous cutting oil, a fiber dyeing bath, a scouring bath and the like because it has excellent dilution stability, defoaming durability and high temperature stability. Yes, this foam control composition has A) the general formula described above.
(1) polyoxyalkylene-modified silicone oil, B) dimethylpolysiloxane and (CH ₃ ) ₃ SiO _1/2 unit
A mixture composed of a siloxane resin composed of SiO ₂ units and finely divided silica, C) polyoxyethylene-polyoxypropylene copolymer, and D) a mixture of a predetermined amount of dimethylpolysiloxane having a hydroxyl group at the terminal of the molecular chain. It

The polyoxyalkylene-modified silicone oil as the component A) constituting the foam control composition of the present invention has the general formula

[Chemical 3] , Where G ¹ is selected from R ¹ , G ² or G ³ ,
G ^2, G ³ is represented by the formula _{(CH 2) r -O- (R} 2 O) s -Q, R 2 is an ethylene group and a propylene group, r 2-6, preferably 2 to
3, s is 5 to 50, preferably 15 to 45, G ² is 10 to 30 mol% of ethyleneoxy group in (R ² O) group, and G ³ is (R ² O) group. 65 to 85 mol% of ethyleneoxy groups in
Be required to be.

When the average molecular weight of G ² and G ³ is less than 500, the effect of the alkyleneoxy group as a hydrophilic group is not sufficiently exhibited, and when it exceeds 3,000, the viscosity becomes too high and the dispersibility,
Since the workability becomes poor, it is necessary to set it in the range of 500 to 3,000, preferably 1,000 to 2,000. Also this
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. It must be in the range of 3.

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, an octyl group, an acetyl group and an isocyanic acid group. Monovalent organic group, R ¹ is a monovalent hydrocarbon group, but if the carbon number exceeds 20, the defoaming property and the water dispersibility will deteriorate, so the carbon number will be 3 to 20.
When m and n are positive numbers from 1 to 30, m + n is from 3 to 40, preferably from 3 to 20, and p is less than 10, the defoaming property becomes poor and the viscosity The storage separation stability deteriorates due to the decrease, and when it exceeds 100, the viscosity upon dilution increases 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 moiety 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 polyoxyalkylene-modified silicone oil having a methyl group containing an ≡SiH group and a vinyl group or an allyl group at the terminal 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 to 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 or the like.
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, a uniform and stable self-emulsifying emulsion is unlikely to be formed.
The amount may be 80% by weight, more preferably 50 to 70% by weight.

Next, the foam inhibitor composition of the present invention is constituted.
The composition as the component (B) is the main component for imparting the defoaming durability to the foam inhibitor composition of the present invention, which comprises dimethylpolysiloxane and (CH ₃ ) ₃ SiO _1/2 units. And a siloxane resin consisting essentially of SiO ₂ units and finely divided silica.

The dimethylpolysiloxane used here may be linear or branched, but is preferably one in which the molecular chain end is blocked with a trimethylsilyl group. This dimethylpolysiloxane should have a viscosity as low as possible from the viewpoint of ease of dispersion and workability, and the higher viscosity from the viewpoint of defoaming durability, the better.
If the viscosity is less than 10 cS, the resulting composition will have poor stability, and if the viscosity is greater than 100,000 cS, the thickening will be significant when diluted with water before use as a suds suppressor composition. There is a problem with sex, so 10 to 10
It is preferably in the range of 0,000 cS, preferably 100 to 5,000 cS.

The siloxane resin used here is a known method (US Pat. Nos. 2,676,182 and 2,814,601).
No. 2,857,356, JP-A-61-195129, JP-A-63-2
It can be easily manufactured. This siloxane resin has a ratio of (CH ₃ ) ₃ SiO _1/2 unit / SiO ₂ unit of 0.4 / 1 to 1.3 / 1, which is dissolved in an organic solvent or dimethylpolysiloxane. To use as. The organic solvent or dimethylpolysiloxane is not particularly limited as long as it can stably disperse the siloxane resin, but this includes dimethylpolysiloxane having a viscosity of 0.6 to 100 cS and a boiling point of 70 at normal pressure. Examples thereof include saturated aliphatic hydrocarbons, aliphatic alcohols and aromatic hydrocarbons having a temperature of up to 300 ° C.

As the dimethylpolysiloxane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane,
Cyclic dimethylpolysiloxane such as dodecamethylcyclohexasiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane,
Examples are linear dimethylpolysiloxanes such as dodecamethylpentasiloxane and tetradecamethylhexasiloxane.

Examples of the saturated aliphatic hydrocarbons used here include n-heptane, cyclohexane, kerosene, isoparaffins and chlorine hydrocarbons such as trichloroethane, trichloroethylene and perchloroethylene. Aliphatic alcohols Examples thereof include ethanol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, t-butyl alcohol, isopropyl alcohol and the like, and aromatic hydrocarbons such as benzene, toluene and xylene. It is illustrated.

The finely powdered 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 Nippon Silica Co., Ltd.], Cabosil [trade name of Cabot Corporation of the United States], Examples include Santocell [trade name of Monsanto Chemical Co., USA], and it is preferable that these have a specific surface area by the BET method of 100 m ² / g or more.

The compounding ratio of the dimethylpolysiloxane, the siloxane resin and the fine powder silica is 100 to 100% by weight of dimethylpolysiloxane and 0.1 to 10 parts by weight of the siloxane resin and 1 to 40 parts by weight of the fine powder silica. And it is sufficient. If the amount of this siloxane resin is less than 0.1 parts by weight, the defoaming sustainability will be poor, and if it exceeds 10 parts by weight, the stability of the composition to be diluted with water will decrease, so the amount is set to 0.1 to 10 parts by weight, but more preferably. Is 0.5 to 5 parts by weight.
If the amount of this finely divided silica is less than 1 part by weight, the defoaming performance will be poor, and if it is more than 40 parts by weight, the viscosity of the composition will increase and the water dispersibility will decrease, so the amount will be 1-40 parts by weight. It is more preferably 5 to 20 parts by weight.

The composition as the component B) used in the present invention is prepared by mixing the above-mentioned dimethylpolysiloxane oil, siloxane resin and fine powder silica, and heat treating at room temperature to 200 ° C. Although it can be produced by removing it, if the blending amount of this component B) in 100% by weight of the foam inhibitor composition of the present invention is less than 5% by weight, the defoaming performance is not sufficiently exerted, and 50% by weight is obtained. If more is added, the system thickens, causing a problem in workability.
It is good to be in the range of 50 to 50% by weight, more preferably 10 to 30% by weight.

It also constitutes the suds suppressor composition of the present invention.
The polyoxyethylene-polyoxypropylene copolymer as the component C) serves as an emulsification aid for emulsifying and dispersing the components A), B) and the component D) described below.
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.
It is required to be in the range of 3,000 to 3,000, preferably 1,500 to 2,500.

Further, when the ethyleneoxy group contained in the component C) is less than 10 mol%, the hydrophobicity becomes strong and the function as an emulsification aid becomes insufficient, and when it exceeds 85 mol%, the hydrophilicity becomes poor. In this case too, the function as an emulsification aid cannot be fully exerted, and therefore the content of ethyleneoxy groups must be in the range of 10 to 85 mol%, preferably 30 to 70 mol%. However, if the content of this product in 100% by weight of the foam suppressor composition is less than 5% by weight, the storage stability will be poor, and if it is more than 50% by weight, the dilution stability of the composition will be poor. This is 5
The content may be in the range of 50 to 50% by weight, more preferably 10 to 30% by weight.

The dimethylpolysiloxane as the component D) constituting the foam control composition of the present invention is a linear one in which both ends of the molecular chain are blocked with monohydroxydimethylsilyl groups. This is effective as a binder of the above-mentioned A) component and B) component in the foam suppressor composition of the present invention, and the interface between A) component and B) component in which monohydroxydimethylsilyl group is originally less compatible. It has the function of lowering the tension and improves the compatibility of these components.
If this viscosity is less than 10 cS, it causes an oil spot, and if the viscosity is higher than 500 cS, the viscosity cannot be lowered, and the effect of its addition is insufficient, so the viscosity of this suds suppressor composition cannot be increased. Moreover, it is necessary that the viscosity is 10 to 500 cS, preferably 30 to 200 cS.

The foam inhibitor composition of component D) is 100% by weight.
If the compounding amount is less than 2% by weight, the above-mentioned effects are not sufficiently exhibited, and if it exceeds 20% by weight, the viscosity becomes too low and the silica content precipitates, which deteriorates the storage stability over time. -20% by weight, more preferably 5-
It may be in the range of 15% by weight.

The foam control composition of the present invention has the above A) to D).
It can be obtained by mixing a predetermined amount of the components, which can be uniformly mixed by using a mixer such as a homomixer, and the mixing order is not particularly limited, but at the time of mixing. You may heat in the range of 40-150 degreeC.

The foam inhibitor composition of the present invention thus obtained imparts an excellent low foaming property to a liquid to which it is added for a long period of time, and this composition has excellent dispersion stability and high temperature, Since it has excellent mechanical stability under high shear and does not cause agglomeration, it can be suitably used as an antifoaming agent for aqueous cutting oils and oil agents or general paints in various dyeing processes, and various oil agents. it can.

[0027]

[Examples] Examples and comparative examples of the present invention will be given below. In the examples, the viscosity shows the measured value at 25 ° C, and the various physical properties show the measured values by the following test methods.

(Dilution Stability Test Method) 10 of foam control composition
Add 100 g of 100% aqueous dispersion to a 200 ml glass beaker and add 25
The temporal stability after storage at 1 ° C for 1 day was visually evaluated as follows. ⊚: Good emulsion and oil floating are not observed. ○: There is some oil floating or silica sedimentation. Δ: A lot of oil floats and a lot of silica sediments.

(Defoaming test method) 100 g of a 0.2% sodium oleate aqueous solution was put into a 1,000 cc measuring cylinder,
1.0 g of 10% aqueous dispersion of suds suppressor composition (as an active ingredient
1,000 ppm) was added, and the amount of foaming (foaming amount + liquid amount) after 5 minutes was measured at 25 ° C. by an air bubbling method in which air was blown at 1.0 liter / min through a glass dephasor stone.

Example 1 Component A) Average composition formula

[Chemical 4] 650 g of polyoxyalkylene-modified silicone oil with a viscosity of 950 cS

Component B) Dimethyl silicone oil having a viscosity of 1,000 cS (B-
1) 439 g, dimethyl silicone oil (B-2) with a viscosity of 100 cS 439 g, average particle size 1.4 μm and specific surface area
100 g of wet silica (B-3) which is 300 m ² / g and (C
H ₃ ) ₃ SiO _1/2 / SiO ₂ ratio of 0.58 / 1 siloxane resin
In a glass 2 liter flask, 42 g of 60% toluene solution (B-4) was distilled off at a low pressure of 100 mmHg at 120 ° C. to remove low-boiling substances, heat treated at 150 ° C. for 3 hours, and mixed with a homomixer 150 g.

Component C) Formula

[Chemical 5] 150 g of a polyoxyethylene-polyoxypropylene copolymer having a viscosity of 250 cS, component D) 80 g of a linear dimethyl silicone oil having a viscosity of 56 cS with both ends of the molecular chain blocked with silanol groups, The above components A) to D) are mixed and mixed with a homomixer for 5 minutes to 10 minutes.
The foam inhibitor composition a) was adjusted by stirring for minutes, and the dilution stability and defoaming property of this composition were examined. The results shown in Table 1 below were obtained.

Example 2 As component B), 439 g of (B-1) in Example 1,
(B-2) 439 g, (B-3) 100 g and (CH _{3) 3} SiO
60% of siloxane resin with a _1/2 / SiO ₂ ratio of 0.7 / 1
Example 1 except 42 g of toluene solution (B-5) was used
Example 1 with components A), C) and D) used in
A foam inhibitor composition (b) was prepared in the same manner as described above, and the dilution stability and defoaming property of this composition were examined. The results shown in Table 1 below were obtained.

Example 3 As component B), 439 g of (B-1) in Example 1 (B)
-2) 439g, (B-3 ) 100g and _{(CH 3) 3 SiO 1/2 /} SiO 2
Was treated as in Example 1 with components A), C) and D) used in Example 1 except that 42 g of a 60% toluene solution of a siloxane resin (B-6) having a ratio of 0.74 / 1 was used. The foam inhibitor composition C) was prepared and examined for its dilution stability and defoaming property, and the results shown in Table 1 below were obtained.

Example 4 Instead of (B-4) in Example 1 as the component B),
Components A) and C) used in Example 1, except that 42 g of a 60% toluene solution (B-7) of a siloxane resin having a ratio of (CH ₃ ) ₃ SiO _1/2 / SiO ₂ of 0.85 / 1 was used. , D) with Example 1
A foam inhibitor composition d) treated in the same manner as in Example 1) was prepared, and its dilution stability and defoaming property were investigated.
The result as shown in was obtained.

Example 5 As component B), instead of (B-4) of Example 1, (CH ₃ ) ₃
60% of siloxane resin with a ratio of SiO _1/2 / SiO ₂ of 1.1 / 1
A foam control composition (e) was prepared by treating in the same manner as in Example 1 with the components A), C) and D) used in Example 1 except that 42 g of a toluene solution (B-8) was used. When the dilution stability and the defoaming property of the product were examined, the results shown in Table 1 below were obtained.

Example 6 As component B), instead of (B-4) in Example 1, (CH ₃ ) ₃
60% of siloxane resin with a SiO _1/2 / SiO ₂ ratio of 1.15 / 1
A foam inhibitor composition was prepared by performing the same treatment with the same components as in Example 1 except that 42 g of a toluene solution (B-9) was used, and the dilution stability and defoaming property of this product were examined. As a result, the results shown in Table 1 described later were obtained.

Example 7 As component B), instead of (B-4) of Example 1, (CH ₃ ) ₃
60% of siloxane resin with a SiO _1/2 / SiO ₂ ratio of 1.3 / 1
Octamethylcyclotetrasiloxane solution (B-10) 42
A foam inhibitor composition g) was prepared by performing the same treatment with the same components as in Example 1 except that g was used, and its dilution stability and defoaming property were examined. The result as shown in was obtained.

Comparative Example 1 As component B), 450 g of (B-1) in Example 1 (B)
-2) Same as Example 1 with components A), C), and D) used in Example 1, except that only 450 g and (B-3) 100 g were used and no siloxane resin was used. As a result, a foam inhibitor composition H) was prepared and its dilution stability and defoaming property were examined. As a result, the results shown in Table 1 below were obtained.

Comparative Example 2 450 g of (B-1) used in Example 1 as component B),
(B-2) 450 g (B-3) 100 g and hexamethyldisilazane (B-11) 100 g, except that the components A), C) and D) used in Example 1 were used in the same manner as in Example 1. A foam suppressor composition (i) was prepared by treating the composition, and the dilution stability and defoaming property of this composition were examined. The results shown in Table 1 below were obtained.

Comparative Example 3 As component A), the average composition formula is

[Chemical 6] 650 g of polyoxyalkylene-modified silicone oil having a viscosity of 1,800 cS is used, and components B), C),
D) was used in the same manner as in Comparative Example 1 and treated in the same manner as in Example 1 to prepare a suds suppressor composition n). The dilution stability and defoaming property of this product were examined. Table 1
The result as shown in was obtained.

Comparative Example 4 Component A) is the same as Comparative Example 3, and components B), C),
For D), the same as in Example 2 was used, and these were treated with the same blending amount to prepare a suds suppressor composition l). The dilution stability and defoaming property of this product were examined. The result as shown in 1 was obtained.

[0043]

[Table 1]

[0044]

The present invention relates to a suds suppressor composition, which comprises A) a polyoxyalkylene-modified silicone oil represented by the general formula (1), B) a dimethylpolysiloxane oil and a siloxane resin, as described above. Compound consisting of finely divided silica, C) Polyoxyethylene-
The present invention is characterized in that it comprises a polyoxypropylene copolymer and D) a dimethylpolysiloxane oil whose molecular chain ends are blocked with monohydroxydimethylsilyl groups. This is a conventionally known silicone antifoaming agent. It is superior in dilution stability, defoaming durability, and high-temperature characteristics compared to other products, which gives it an industrial advantage of being able to reduce the amount added, but this product is particularly superior in stability and water-based. It can be suitably used as a defoaming agent for cutting oil, various oil agents, fiber dyeing step, and scouring step.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Satoshi Kuwata 1 Hitomi, Otomi, Matsuida-cho, Usui-gun, Gunma 10 Shin-Etsu Chemical Co., Ltd. Silicone Electronic Materials Research Laboratory

Claims (1)

[Claims] 1. A) General formula: [G ¹ is a group selected from R ¹ , G ² or G ³ , and G ² and G ³ are of the formula (CH ₂ ) _r -O- (R ² O) _s Q (R ² is Ethylene group and propylene group, Q is a hydrogen atom or a carbon number of 1 to
8 is a monovalent organic group selected from an alkyl group, an acetyl group and an isocyanic acid group, r is 2 to 6 and s is a group represented by 5 to 50), and G ² is a group in the (R ² O) group. 10 to 30 ethyleneoxy groups
Mol%, G ³ is such that the ethyleneoxy group in the (R ² O) group is 65 to 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 of 1 to 30, p is 10 to 100, and q is a positive number of 1 to 10] 30 to 80% by weight of polyoxyalkylene-modified silicone oil, B) the viscosity at 25 ° C is 10 to 100 parts by weight of 100,000 cS dimethylpolysiloxane, (CH ₃ ) ₃ SiO _1/2 units and SiO 2
Essentially consists of ₂ units and the ratio of (CH ₃ ) ₃ SiO _1/2 / SiO ₂ is
Siloxane resin 1-10 in the range of 0.4 / 1-1.3 / 1
5 to 50% by weight of a blend consisting of 1 to 40 parts by weight of finely divided silica and C) a polyoxyethylene-polyoxypropylene having a molecular weight range of 500 to 3,000 and an ethyleneoxy group of 10 to 85 mol%. Copolymer 5 to 50% by weight, D) 2 to 20% by weight of dimethylpolysiloxane whose viscosity at 25 ° C. is 10 to 500 cS, both ends of which are blocked with monohydroxydimethylsilyl groups. A suds suppressor composition characterized.