JP7187005B2 - antifoam composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to an antifoaming composition, and more particularly to a polyether antifoaming composition that exhibits antifoaming properties against foaming of surfactants.

Antifoaming agents are used in various industrial fields, and can be categorized by chemical composition into silicone antifoaming agents emulsified with polydimethylsiloxane, oil antifoaming agents based on mineral oil, There are high-alcohol antifoaming agents in which solid higher alcohol is emulsified and dispersed in water, and polyether antifoaming agents using a special polyether that self-emulsifies when added to water.

Antifoaming agents other than polyether antifoaming agents usually contain silica or some organic matter that is solid at room temperature (higher alcohol, paraffin wax, ethylene bisamide, etc.), but polyether antifoaming agents do not contain solid components. One feature is that it does not include

Antifoaming agents are used differently depending on the cause of foaming or the field of application, and wastewater treatment is an example of a field in which polyether-based antifoaming agents are used.
Microorganism-derived water-soluble polymeric substances produced in the process of biodegrading organic matter with activated sludge cause foaming, and polyether-based defoaming agents are effective against this. In addition, silicone-based antifoaming agents and oil-based antifoaming agents cannot be used for wastewater treatment because the oil that separates from them interferes with biological treatment, so polyether-based antifoaming agents are used. Furthermore, when there is a membrane treatment facility, there is a problem that separated oil from silicone-based defoaming agents and oil-based defoaming agents clogs the pores of water separation membranes, so polyether-based defoaming agents are used. be.

In addition to wastewater treatment, polyether antifoams are also used in industrial areas to avoid oil spots, scum or sediments on the final product. Specific examples of such industrial fields include plating, fiber processing, and coating.

Conventionally used polyether antifoaming agents include those obtained by adding alkylene oxide to higher alcohols or dihydric to hexahydric polyhydric alcohols, and those obtained by esterifying the terminal hydroxyl groups of these (Non-Patent Document 1. In this document, polyether antifoaming agents are referred to as "polyglycol antifoaming agents").

However, these conventional polyether-based antifoaming agents are insufficient in antifoaming effect against surfactant foaming. As a defoaming mechanism, it is essential that the antifoaming agent itself is insoluble in the foaming liquid. This is because the antifoaming agent becomes more or less soluble due to the action of . In particular, anionic surfactants have a strong effect of solubilizing polyether antifoaming agents.

In general, silicone antifoaming agents are most effective for surfactant foaming, but as mentioned above, there are industrial fields and wastewater treatment processes where silicone antifoaming agents cannot be used. Foaming, which is a problem in plating, fiber treatment, painting, etc., is caused by surfactants. Also, in wastewater treatment, an antifoaming agent effective against foaming of the surfactant is required in activated sludge treatment of wastewater containing a surfactant.
Therefore, a polyether antifoaming agent that is suitable for wastewater treatment and has a high antifoaming effect is eagerly awaited.

As a polyether antifoaming agent with enhanced antifoaming effect, a polyamine to which alkylene oxide is added has been proposed (Patent Document 1). Although the present invention provides antifoam compositions for solid surface cleaning foaming, as noted above, there are other fields in which polyether antifoams are used, and such fields include: The antifoaming composition of the present invention has insufficient antifoaming performance.

In addition, polyether antifoaming agents added with alkaline earth metal salts of fatty acids (Patent Document 2) and those with higher fatty acids added (Patent Document 3) have been proposed. It has a shape in which fatty acid salt particles are dispersed. As a result, the advantage of the polyether-based antifoaming agent that scum is not generated is lost, and the applicable range is narrowed.

In addition, it has been proposed to improve the knockdown property by adding a salt of a branched fatty acid (Patent Document 4), but this method cannot improve the durability and is sufficient for surfactant foaming. It does not give full effect.

As described above, the conventional polyether-based antifoaming agent has a drawback that its antifoaming effect against the foaming of the surfactant is insufficient. Especially in industrial fields (industrial fields such as plating, fiber processing, painting, etc.) where problems such as oil spots, scum, and deposits occur when using silicone-based defoaming agents and oil-based defoaming agents. As a foaming agent, the use of a polyether antifoaming agent is required, but conventional polyether antifoaming agents are insufficient in antifoaming properties.

JP-A-2005-230711 JP-A-10-323505 JP-A-9-308804 JP-A-2003-113597

Technical Information Institute, "Countermeasures against Foam Problems and Defoaming Technology" (2002)

The present invention has been made in view of the above background art, and an object thereof is to provide a defoaming agent composition that enhances the defoaming effect of a polyether-based defoaming agent against surfactants and has a practically sufficient defoaming effect. is to provide

As a result of intensive studies to solve the above problems, the present inventors have found that by including a specific polyether compound as a component of the polyether antifoaming agent, the polyether antifoaming effect on the surfactant is improved. The inventors have found that the defoaming effect of the agent is greatly improved, and have completed the present invention.

That is, the present invention provides a polyether antifoaming composition characterized by containing a polyetheramine obtained by blocking the ends of a polyether with an amino group (--NH ₂ ).

ADVANTAGE OF THE INVENTION According to this invention, the antifoaming effect of the polyether type antifoaming agent against foaming resulting from surfactant can be improved, and the antifoaming agent composition which has a practically sufficient antifoaming effect can be provided.
In particular, the polyether antifoaming agent of the present invention exhibits a sufficient antifoaming effect in industrial fields such as plating, fiber treatment, and painting where silicone antifoaming agents and oil antifoaming agents cannot be used. can.

1 is a schematic diagram of a defoaming test apparatus used in Examples and Comparative Examples; FIG. 4 is a graph showing defoaming test results of Examples and Comparative Examples.

Although the present invention will be described below, the present invention is not limited to the following embodiments, and can be arbitrarily modified and implemented.

The polyether antifoam composition of the present invention contains a polyether amine obtained by blocking the ends of a polyether compound with amino groups (--NH ₂ ).

"Polyether compound" refers to general compounds having multiple ether bonds (-O-) in the molecule, such as ethylene oxide (hereinafter sometimes referred to as "EO"), propylene oxide (hereinafter, It is a compound having a structure obtained by addition polymerization of an alkylene oxide such as "PO" in some cases. Polyether-based compounds contain alkylene oxide units such as ethylene oxide units (EO units; —CH ₂ CH ₂ O—) and propylene oxide units (PO units; —CH(CH ₃ )CH ₂ O—) in the molecule. have many.

<Polyetheramine>
The polyetheramine contained in the polyether antifoaming composition of the present invention is a polyether whose terminals are blocked with amino groups, and only a part of the terminals may be blocked with amino groups. , all of which may be blocked with amino groups.
The polyetheramine contained in the polyether antifoaming composition of the present invention is a type of polyether compound.

The polyetheramine contained in the polyether antifoaming composition of the present invention preferably has a number average molecular weight of 1,000 or more, particularly preferably 1,500 or more. Moreover, it is preferably 10,000 or less, and particularly preferably 7,000 or less.
When it is within the above range, it is easy to exhibit an antifoaming effect against foaming caused by the surfactant.
If the number-average molecular weight is less than 1,000, the antifoaming effect may be weakened regardless of the combination of alkylene oxide units. On the other hand, if the number average molecular weight is more than 10,000, the viscosity becomes significantly high, and scum may occur when used as an antifoaming agent.

The degree of polymerization (the number of alkylene oxide units in the molecule) of the polyetheramine contained in the polyether antifoaming agent composition of the present invention is preferably 20 or more, particularly preferably 30 or more. Moreover, 200 or less are preferable and 100 or less are especially preferable.
When it is within the above range, it is easy to exhibit an antifoaming effect against foaming caused by the surfactant.

<<Compound Represented by Formula (1)>>
Examples of the polyetheramine contained in the polyether antifoaming composition of the present invention include compounds represented by the following general formula (1).

In general formula (1), ^x1 is a number of 30 or more and 200 or less. R ¹ is a hydrogen atom or a methyl group, and each R ¹ may be different.

The compound represented by the general formula (1) is a compound obtained by aminating an end of an ethylene oxide and/or propylene oxide polymer.
The ratio of EO and PO in the polymer is not particularly limited, but the compound represented by general formula (1) is insoluble in water or A combination of EO and PO, or PO alone (all ^R1 's are methyl groups) is preferred because it is necessary to design for emulsification and dispersion. EO alone (where all R ¹ are hydrogen atoms) is not preferred because it is too water soluble.

When EO and PO are used in combination, that is, when the compound represented by general formula (1) is a terminally aminated EO/PO copolymer, the ratio of EO and PO in the EO/PO copolymer is , EO:PO=1:1 to 1:20, particularly preferably 1:2 to 1:10.
Also, the EO/PO copolymer may be a block copolymer or a random copolymer.

Commercially available products of the compound represented by formula (1) include JEFFAMINE D-2000 and D-4000 from HUNTSMAN (USA).

<<Compound represented by formula (2)>>
Another example of the polyetheramine contained in the polyether antifoaming composition of the present invention includes compounds represented by the following general formula (2).

In general formula (2), ⁿ² is 0, 1 or 2. x ² +y ² +z ² is a number of 30 or more and 200 or less. ^R2 is a hydrogen atom or a methyl group, and each ^R2 may be different.

The compound represented by the general formula (2) is a compound having a structure obtained by addition-polymerizing ethylene oxide and/or propylene oxide to a trihydric polyhydric alcohol and aminating the ends.
As in the case of the compound represented by the general formula (1), the compound represented by the general formula (2) is insoluble in water or It must be designed to emulsify and disperse.
As in the case of the compound represented by the general formula (1), it is not preferable that all the alkylene oxide units in the compound represented by the general formula (2) are EO units. Alternatively, preferably all are PO units.

When both EO units and PO units are present, their ratio is preferably EO:PO=1:1 to 1:20, particularly preferably 1:2 to 1:10.
When both EO units and PO units are present, each of the three ( ) in the compound represented by the general formula (2) may be composed of only EO units, or may be composed only of PO units. Alternatively, EO units and PO units may be mixed. When mixed, the EO units or PO units may be continuous or random.

Commercially available products of the compound represented by formula (2) include JEFFAMINE T-3000 and T-5000 from HUNTSMAN (USA).

<Other polyether compounds>
The polyether-based antifoaming composition of the present invention may contain a polyether-based compound (hereinafter sometimes referred to as "another polyether-based compound") in addition to the above-described polyetheramine. . Other polyether compounds are exemplified below. Other polyether compounds may be used singly or in combination of two or more.

<<Compound represented by formula (3)>>
Examples of other polyether compounds include compounds (polyoxyalkylenes) represented by the following general formula (3).

In general formula (3), ⁿ³ is a number of 30 or more and 200 or less. ^R3 is a hydrogen atom or a methyl group, and each ^R3 may be different.

( ) in the compound represented by the general formula (3) may be composed only of EO units (R ³ is a hydrogen atom), or may be composed only of PO units (R ³ is a methyl group). Alternatively, EO units and PO units may be mixed. When mixed, the EO units or PO units may be continuous or random.
Examples include a structure in parentheses in which both ends are EO units and the center is PO units, and a structure in parentheses in which both ends are PO units and the center is EO units.

Commercially available products of the compound represented by the general formula (3) include Adeka Pluronic L-31, L-61, L-62, L-71, L-72, L-101, L-121, manufactured by ADEKA Corporation. 25R-1, 17R-2 and the like.

<<Compound Represented by Formula (4)>>
Examples of other polyether compounds include compounds represented by the following general formula (4) (polyoxyalkylene mono fatty acid esters).

In general formula (4), ⁿ⁴ is a number of 30 or more and 200 or less. R ^A4 is an alkyl group having 4 to 22 carbon atoms. R ^B4 is a hydrogen atom or a methyl group, and each R ^B4 may be different.

In the ( ) in the compound represented by the general formula (4), it may be composed only of EO units (R ^B4 is a hydrogen atom), or may be composed only of PO units (R ^B4 is a methyl group). Alternatively, EO units and PO units may be mixed. When mixed, the EO units or PO units may be continuous or random.
Examples include a structure in parentheses in which both ends are EO units and the center is PO units, and a structure in parentheses in which both ends are PO units and the center is EO units.

The compound represented by the general formula (4) is obtained, for example, by mixing the compound (polyoxyalkylene) represented by the general formula (3) and a fatty acid having 4 to 22 carbon atoms in an equimolar amount and adding an esterification catalyst. It can be easily synthesized by heating to 150 to 200° C. for esterification.

Examples of the fatty acids include naturally occurring saturated fatty acids such as caprylic acid, pelargonic acid, caproic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, and behenic acid; Naturally derived unsaturated fatty acids; synthetic fatty acids having a branched structure such as 2-ethylhexanoic acid, isopalmitic acid and isostearic acid; and the like can be used.
One of these fatty acids may be selected, or a plurality of fatty acids may be combined.

As a catalyst for esterification, a basic catalyst such as sodium hydroxide, an acidic catalyst such as p-toluenesulfonic acid, a metal oxide catalyst such as antimony trioxide, an organic titanium catalyst such as titanium alkoxide, and the like are used. can do.

<<Compound Represented by Formula (5)>>
Examples of other polyether compounds include compounds represented by the following general formula (5) (polyoxyalkylene difatty acid esters).

In general formula (5), ⁿ⁵ is a number of 30 or more and 200 or less. R ^A5 is an alkyl group having 4 to 22 carbon atoms. R ^C5 is an alkyl group having 4 to 22 carbon atoms. R ^B5 is a hydrogen atom or a methyl group, and each R ^B5 may be different.

In the ( ) in the compound represented by the general formula (5), it may be composed only of EO units (R ^B5 is a hydrogen atom), or may be composed only of PO units (R ^B5 is a methyl group). Alternatively, EO units and PO units may be mixed. When mixed, the EO units or PO units may be continuous or random.
Examples include a structure in parentheses in which both ends are EO units and the center is PO units, and a structure in parentheses in which both ends are PO units and the center is EO units.

The compound represented by the general formula (5) is obtained by, for example, mixing the compound (polyoxyalkylene) represented by the general formula (3) and a fatty acid having 4 to 22 carbon atoms so that the amount of the fatty acid becomes twice the molar amount. It can be easily synthesized by adding an esterification catalyst and heating to 150 to 200° C. for esterification.

As the above-mentioned fatty acid and the catalyst for esterification, the same substances as mentioned in the above <<compound represented by formula (4)>> can be appropriately used.

<<Compound represented by general formula (6)>>
Examples of other polyether compounds include compounds represented by the following general formula (6) (polyoxyalkylene alkyl ethers).

In general formula (6), ⁿ⁶ is a number of 30 or more and 200 or less. R ^A6 is an alkyl group having 4 to 22 carbon atoms. R ^B6 is a hydrogen atom or a methyl group, and each R ^B6 may be different.

In the ( ) in the compound represented by the general formula (6), it may be composed only of EO units (R ^B6 is a hydrogen atom), or may be composed only of PO units (R ^B6 is a methyl group). Alternatively, EO units and PO units may be mixed. When mixed, the EO units or PO units may be continuous or random.

Commercially available products of the compound represented by formula (6) include Unisafe 34S-23, Unisafe 10-P8, Unilube 50MB-26, and Nonion A-25B manufactured by NOF Corporation.

<<Compound represented by general formula (7)>>
Examples of other polyether-based compounds include compounds represented by the following general formula (7) (esterified products of polyoxyalkylene alkyl ethers).

In general formula (7), ⁿ⁷ is a number of 30 or more and 200 or less. R ^A7 is an alkyl group having 4 to 22 carbon atoms. R ^C7 is an alkyl group having 4 to 22 carbon atoms. R ^B7 is a hydrogen atom or a methyl group, and each R ^B7 may be different.

In the ( ) in the compound represented by the general formula (7), it may be composed only of EO units (R ^B7 is a hydrogen atom), or may be composed only of PO units (R ^B7 is a methyl group). Alternatively, EO units and PO units may be mixed. When mixed, the EO units or PO units may be continuous or random.

The compound represented by the general formula (7) is obtained, for example, by mixing an appropriate amount of the compound represented by the general formula (6) (polyoxyalkylene alkyl ether ester) and a fatty acid having 4 to 22 carbon atoms and adding an esterification catalyst. It can be easily synthesized by heating to 150 to 200° C. for esterification.

Examples of the fatty acids include naturally occurring saturated fatty acids such as caprylic acid, pelargonic acid, caproic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, and behenic acid; Naturally derived unsaturated fatty acids; synthetic fatty acids having a branched structure such as 2-ethylhexanoic acid, isopalmitic acid and isostearic acid; and the like can be used.
One of these fatty acids may be selected, or a plurality of fatty acids may be combined.

As a catalyst for esterification, a basic catalyst such as sodium hydroxide, an acidic catalyst such as p-toluenesulfonic acid, a metal oxide catalyst such as antimony trioxide, an organic titanium catalyst such as titanium alkoxide, and the like are used. can do.

When the polyether-based antifoaming agent composition of the present invention contains the polyetheramine and other polyether-based compounds, the content ratio of the polyetheramine to the entire polyether-based compound is preferably 1% by mass or more, 2% by mass or more is more preferable, and 3% by mass or more is particularly preferable. Moreover, it is preferably 70% by mass or less, more preferably 60% by mass or less, and particularly preferably 50% by mass or less.
If the polyetheramine content is less than 1% by mass, the antifoaming effect of the surfactant on foaming may be insufficient. Moreover, when the content ratio of the polyetheramine exceeds 70% by mass, the antifoaming effect may decrease when the foaming component is contained in addition to the surfactant.

<Other ingredients>
The polyether-based antifoaming composition of the present invention can contain components other than polyetheramine and other polyether-based compounds, if necessary.
The form of the polyether-based antifoaming agent composition of the present invention is not particularly limited. For example, it may be a solid product obtained by mixing each component, or it may be emulsified by adding water.

For example, when the polyether antifoaming composition of the present invention is applied to the coating field, a low HLB surfactant may be added to control wettability. In this case, as the surfactant, acetylene alcohol to which alkylene oxide is added; acetylene glycol to which alkylene oxide is added; and the like are suitable.

In addition, the polyether antifoaming composition of the present invention may have high viscosity and poor handleability. In that case, a low-viscosity water-soluble solvent may be added to lower the viscosity before use. The water-soluble solvent used for viscosity reduction is not particularly limited, but γ-butyrolactone and the like are preferable from the viewpoint of low viscosity and relatively high flash point.

Further, when emulsifying the polyether antifoam composition of the present invention, surfactants, thickeners, etc. may be added to improve the stability of the emulsion, and preservatives may be added to prevent spoilage. may be added.

The polyether antifoam composition of the present invention preferably does not contain polydimethylsiloxane. Since it does not contain polydimethylsiloxane, the problem of pore clogging does not occur when it is used in a membrane treatment facility or the like.

<Application>
The polyether antifoaming agent composition of the present invention does not cause problems such as oil spots, scum and precipitates, and exhibits a sufficient antifoaming effect against surfactant foaming. It is particularly suitable for use as an antifoaming agent in fields where foaming agents or oil-based antifoaming agents cannot be used, or in fields where surfactants are used.
Specifically, the polyether antifoaming composition of the present invention is used for desizing, refining, or dyeing processes in the textile industry; for degreasing, electrolytic cleaning, or chemical conversion processes in the plating industry; It can be used as an antifoam composition such as for The polyether antifoaming composition of the present invention has an antifoaming effect against foaming caused by surfactants, which is superior to conventional polyether antifoaming compositions. The antifoam composition is particularly suitable as an antifoam composition for use in these applications.
Further, the polyether-based antifoaming composition of the present invention can be used as an antifoaming composition for membrane treatment type wastewater treatment processes. Since the polyether antifoam composition of the present invention does not clog the membrane pores, the polyether antifoam composition of the present invention is particularly suitable as an antifoam composition for such applications. ing.

EXAMPLES The present invention will be described in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples as long as it does not exceed the gist of the invention.
In addition, "Example 1" is read as "Reference example 1".

[Synthesis Example 1: Synthesis of mono-fatty acid ester of polyoxyalkylene]
A ADEKA Pluronic L-101 (manufactured by ADEKA Co., Ltd., number average molecular weight 3550, hereinafter referred to as "L-101") was added to a 500 mL four-necked separable flask equipped with a stirrer, condenser, water content receiver and thermometer. ), 12.2 g of caprylic acid (manufactured by NOF Corporation, NAA-82, molecular weight 144.2), and 0.31 g of p-toluenesulfonic acid as a catalyst were added. At this time, the molar ratio of L-101 and caprylic acid was 1/1. In addition, the amount of catalyst charged is 0.1% by mass with respect to the raw material.
After purging the inside of the system with nitrogen gas, the temperature was raised to 180° C. under normal pressure and nitrogen gas flow conditions, and the reaction was allowed to proceed for 18 hours. After cooling, the product L-101 monocaprylate was obtained.

[Synthesis Example 2: Synthesis of di-fatty acid ester of polyoxyalkylene]
A ADEKA Pluronic L-61 (manufactured by ADEKA Co., Ltd., number average molecular weight 1960, hereinafter referred to as "L-61") was added to a 500 mL four-necked separable flask equipped with a stirrer, cooling tube, water content receiver and thermometer. ), 86.4 g of oleic acid (manufactured by NOF Corporation, NAA-35, molecular weight: 282.5), and 0.39 g of p-toluenesulfonic acid as a catalyst were added. At this time, the molar ratio of L-61 and oleic acid is 1/2. Moreover, the amount of catalyst charged is 0.1% by mass with respect to the raw material.
After purging the inside of the system with nitrogen gas, the temperature was raised to 180° C. under normal pressure and nitrogen gas flow conditions, and the reaction was allowed to proceed for 18 hours. After cooling, the product L-61 dioleate was obtained.

[Synthesis Example 3: Synthesis of fatty acid ester of polyoxyalkylene alkyl ether]
Unisafe 10P-8 (manufactured by NOF Corporation, number average molecular weight 1120, hereinafter referred to as "10P-8") was added to a 500 mL four-necked separable flask equipped with a stirrer, condenser, water content receiver and thermometer. ), 53.7 g of lauric acid (NAA-122 manufactured by NOF Corporation, molecular weight: 200.3), and 0.35 g of p-toluenesulfonic acid as a catalyst were added. At this time, the molar ratio of 10P-8 and lauric acid is 1/1. Moreover, the amount of catalyst charged is 0.1% by mass with respect to the raw material.
After purging the inside of the system with nitrogen gas, the temperature was raised to 180° C. under normal pressure and nitrogen gas flow conditions, and the reaction was allowed to proceed for 18 hours. After cooling, the product 10P-8 laurate was obtained.

[Preparation of antifoam composition]
Tables 1 and 2 show the formulations of the antifoaming compositions of Examples and Comparative Examples (the unit of numerical values in Tables 1 and 2 is "parts by mass").
Each raw material shown in Tables 1 and 2 was placed in a beaker and stirred with a spatula to prepare an antifoam composition.

・ A: ADEKA Pluronic L-31 (manufactured by ADEKA Co., Ltd.)
・B: Monocaprylic acid ester of ADEKA Pluronic L-101 (manufactured by ADEKA Co., Ltd.) (Synthesis Example 1)
・C: Dioleate ester of ADEKA Pluronic L-61 (manufactured by ADEKA Co., Ltd.) (Synthesis Example 2)
・ D: Unisafe 34S-23 (manufactured by NOF Corporation, POE (34) POP (23) stearyl ether)
・ E: Lauric acid ester of Unisafe 10P-8 (manufactured by NOF Corporation, POE (10) POP (8) cetyl ether) ・ D-2000: JEFFAMINE D-2000 (manufactured by HUNTSMAN)
・ D-4000: JEFFAMINE D-4000 (manufactured by HUNTSMAN)
・ T-3000: JEFFAMINE T-3000 (manufactured by HUNTSMAN)
・T-5000: JEFFAMINE T-5000 (manufactured by HUNTSMAN)

[Defoaming test]
A defoaming test apparatus is shown in FIG. A 1 L graduated cylinder was charged with 500 g of a foaming liquid having the composition shown below, and 5 mg of the defoaming agent composition of each Example or Comparative Example was added. At this time, the defoamer concentration is 10 ppm.

(foaming liquid)
A mixed surfactant aqueous solution of 100 ppm of a nonionic surfactant (Softanol 90, manufactured by Nippon Shokubai Co., Ltd.) and 100 ppm of an anionic surfactant (Tayka Power BN2060, manufactured by Tayca Co., Ltd.).

Next, a diffuser stone connected by a tube from an air pump was put into this graduated cylinder, and aerated and foamed at a flow rate of 1 L/min. The foam height at this time was measured every 15 seconds for 5 minutes.

FIG. 2 shows the defoaming test results. It was found that all the examples had a lower foam height than the comparative examples and had an excellent defoaming effect.

The polyether-based antifoaming agent composition of the present invention is widely used as an antifoaming agent in industrial fields such as wastewater treatment, textile industry, plating, painting, etc., because it has an excellent antifoaming effect against foaming caused by surfactants. It is a thing.

Claims (8)

It contains a polyether amine obtained by blocking the terminal of a polyether with an amino group (—NH ₂ ), and contains a polyether compound in addition to the polyether amine, and the polyether compound has the following general formula (4) or a polyether-based antifoaming agent composition comprising at least one compound selected from compounds represented by the following general formula (7) .

[In the general formula (4), n4 ^is a number of 30 or more and 200 or less. R ^A4 is an alkyl group having 4 to 22 carbon atoms. R ^B4 is a hydrogen atom or a methyl group, and each R ^B4 may be different. ]

[In the general formula (5), n5 ^is a number of 30 or more and 200 or less. R ^A5 is an alkyl group having 4 to 22 carbon atoms. R ^C5 is an alkyl group having 4 to 22 carbon atoms. R ^B5 is a hydrogen atom or a methyl group, and each R ^B5 may be different. ]

[In the general formula (6), n6 ^is a number of 30 or more and 200 or less. R ^A6 is an alkyl group having 4 to 22 carbon atoms. R ^B6 is a hydrogen atom or a methyl group, and each R ^B6 may be different. ]

[In the general formula (7), n7 ^is a number of 30 or more and 200 or less. R ^A7 is an alkyl group having 4 to 22 carbon atoms. R ^C7 is an alkyl group having 4 to 22 carbon atoms. R ^B7 is a hydrogen atom or a methyl group, and each R ^B7 may be different. ] 2. The polyether antifoaming composition according to claim 1, wherein the polyetheramine is a compound represented by the following general formula (1) or (2).

[In general formula (1), x ¹ is a number of 30 or more and 200 or less. R ¹ is a hydrogen atom or a methyl group, and each R ¹ may be different. ]

[In the general formula (2), ⁿ² is 0, 1 or 2. x ² +y ² +z ² is a number of 30 or more and 200 or less. ^R2 is a hydrogen atom or a methyl group, and each ^R2 may be different. ] 3. The polyether antifoaming composition according to claim 1 or 2, wherein the content of said polyetheramine with respect to the entire polyether compound is 1% by mass or more and 70% by mass or less. 4. The polyether antifoaming composition according to any one of claims 1 to 3, which is an antifoaming composition for desizing, refining or dyeing processes in the textile industry. 4. The polyether antifoaming composition according to any one of claims 1 to 3, which is an antifoaming composition for use in a degreasing cleaning process, an electrolytic cleaning process or a chemical conversion treatment process in the plating industry. 4. The polyether antifoaming composition according to any one of claims 1 to 3, which is an antifoaming composition for a coating process. 4. The polyether antifoaming composition according to any one of claims 1 to 3, which is an antifoaming composition for a membrane treatment type wastewater treatment process. 8. The polyether antifoaming composition according to any one of claims 1 to 7, which does not contain polydimethylsiloxane.

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