JPH0249763B2 - SHOHOZAI - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an antifoaming agent, particularly an antifoaming agent with excellent dispersibility in water. Antifoaming agents are used in the synthetic rubber industry, synthetic resin industry, paper industry, fermentation industry, dye industry, dyeing industry, paint industry,
It is used in areas such as the slate industry to prevent foaming in processes and wastewater, and is commonly used in mineral oils, animal and vegetable oils, silicone oils, metal soaps,
Fatty acids, nonionic surfactants, or combinations thereof are known. Many of these conventional antifoaming agents have excellent antifoaming effects depending on the application, but because the antifoaming agents themselves are insoluble or poorly soluble in water, they must be used by dispersing them in water. However, if they were simply dispersed, they would be mixed into the product and cause various troubles. In order to avoid such drawbacks, when an antifoaming agent is used in an emulsified state using a solvent or an emulsifier, there is a problem in that the antifoaming effect is often reduced. In addition, an esterified product of polyoxyethylene polyoxypropylene glycol has been proposed as an antifoaming agent that improves the above-mentioned drawbacks (Japanese Patent Publication No. 7973/1973).
Both its emulsifying properties and defoaming properties were unsatisfactory. This invention is intended to solve the above-mentioned conventional drawbacks, and by using a combination of vegetable oil, animal oil, mineral oil, synthetic oil, or a mixture thereof, and a specific esterified product of polyoxyethylene polyoxypropylene ether. The purpose of the present invention is to provide a self-emulsifying antifoaming agent that forms a stable emulsion in an aqueous system. This invention is an antifoaming agent consisting of a composition containing the following components A and B. A: 50 to 90% by weight of vegetable oil, animal oil, mineral oil, synthetic oil or a mixture thereof that is liquid at room temperature B: Compounds 3 to 20 represented by the following general formula []
Weight% R ¹ O {(C ₃ H ₆ O) a (C ₂ H ₄ O) b} COR ²
...[] (However, R ¹ is an alkyl group or alkenyl group having 1 to 4 carbon atoms, R ² is an alkyl group or alkenyl group having 7 to 21 carbon atoms, a is 0-5, and b is 4-5.
20, the part inside { } may be a random addition, a block addition in an arbitrary order, or a combination thereof. ) In addition to the above A and B components, the above composition may further contain, as a C component, a 1% by weight aqueous solution having a cloud point of 50° C. or less or a water-insoluble nonionic surfactant of 30% by weight or less. . The vegetable oil and animal oil of component A are natural vegetable or animal oils, such as soybean oil, rapeseed oil, olive oil, rice bran oil, and castor oil. Mineral oils are mineral oils such as hydrocarbon oils, such as kerosene, machine oil, spindle oil, and liquid paraffin. Synthetic oils are synthetic oil-based liquids, including those made from natural products, such as fatty acid methyl esters such as rice bran fatty acid methyl, fatty acid ethyl esters, fatty acid propyl esters, fatty acid butyl esters, fatty acid octyl esters, etc. Examples include esters and polyolefins with a low degree of polymerization such as polybutene. Only one type of these may be used, or several types may be used as a mixture. Component B is an esterified product of polyoxyethylene polyoxypropylene ether represented by the general formula [], and examples of the alkyl group or alkenyl group represented by R ¹ include methyl group, ethyl group, propyl group, butyl group, allyl group. There are bases etc. R ² CO represents the acyl group of natural or synthetic fatty acids, such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid,
linoleic acid, behenic acid, 2-ethylhexanoic acid,
These include nonanoic acid, isopalmitic acid, and isostearic acid. As component B, one type of compound of the general formula [] may be used alone, and R ¹ , R ² ,
It may be a, b or a mixture of several types with different addition states. The compound of the general formula [] can be prepared by adding ethylene oxide alone to an alcohol having R ¹ as a residue, or by adding propylene oxide and then adding ethylene oxide in a block form.
Alternatively, after adding ethylene oxide, propylene oxide is added in a block manner, or ethylene oxide and propylene oxide are added in a random manner, or a combination of these block and random additions is added, and then R ² Can be obtained by esterifying CO with a fatty acid having an acyl group. In the general formula [], the number of carbon atoms in R ¹ is 1 to 4
The reason for this limitation is that if it exceeds 4, the water dispersibility will be extremely poor. Also, the number of carbon atoms in R ² is 7~
limited to 21 is less than 7 or
This is because when it exceeds 21, water dispersibility becomes poor.
The reason why the number of moles a of propylene oxide added is limited to 0 to 5 is because water dispersibility deteriorates when it exceeds 5, and the number b of moles added of ethylene oxide is limited to 4 to 20 because: This is because if it is less than 4, the water dispersibility will be poor, and if it is more than 20, the defoaming property will be poor. From the viewpoint of water dispersibility, b is preferably at least 3 times as large as a. Component C is an optional component that is a nonionic surfactant whose cloud point of a 1% aqueous solution is 50℃.
or those that are insoluble in water can be used, such as polyoxyalkylene glycols such as polyoxyethylene glycol, polyoxypropylene glycol, polyoxyethylene polyoxypropylene glycol, or esterified products thereof, and polyoxyethylene alkyl ethers. , polyoxypropylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxypropylene alkyl phenyl ether, polyoxyethylene polyoxypropylene alkyl phenyl ether, polyoxyethylene fatty acid ester, poly Derivatives of ethylene oxide and propylene oxide such as oxypropylene fatty acid ester, polyoxyethylene polyoxypropylene fatty acid ester, polyoxyethylene polyhydric alcohol ether, polyoxypropylene polyhydric alcohol ether, polyoxyethylene polyoxypropylene polyhydric alcohol ether, etc. Examples include polyether compounds and fatty acid esters of polyhydric alcohols such as ethylene glycol, propylene glycol, glycerin, polyglycerin, pentaerythritol, dipentaerythritol, sorbitol, sorbitan, sorbide, and sucrose. The antifoaming agent of the present invention is a composition containing the above-mentioned component A and component B as essential components, and may also contain component C or other components as necessary. Each of these components can be mixed freely within the range of the above-mentioned mixing ratio,
The result is a composition with high self-emulsifying properties and antifoaming effects.
If the blending ratio of each component is out of the above range, coagulation or separation may occur, or self-emulsifying properties or antifoaming effects may deteriorate, which is undesirable. The antifoaming agent of the present invention can be added to a system in which foaming occurs, either as it is or after being dispersed in water, to perform defoaming. When used as a dispersion in water, the dispersion is stable for a long time due to good water dispersibility and can also be stored in the form of an aqueous dispersion. The systems to be defoamed by the defoaming agent of the present invention are not limited, and can be used in a wide range of aqueous systems, particularly in the synthetic rubber industry, synthetic resin industry, paper manufacturing industry, fermentation industry, dye industry, dyeing industry, It is effective against difficult-to-destruct bubbles in processes such as the paint industry and slate industry, and in wastewater. The antifoaming agent of the present invention includes vegetable oil, animal oil, mineral oil,
Synthetic oil or a mixture thereof and a specific polyoxyethylene polyoxypropylene ether ester are used together, so it has good water dispersibility and is self-emulsifying, forming a stable emulsion in an aqueous system. , has a high defoaming effect. Next, examples of the present invention will be described. Example Components A, B, and C shown in Table 1 were blended to prepare antifoam compositions (products of the present invention and comparative products). Then, 10 g of each composition was placed in a beaker, and 190 g of tap water was added and stirred to obtain a 5% dispersion. 100 g of each of these dispersions was placed in a constant temperature bath, one at 5° C. and the other at 40° C., and the dispersion stability was measured by the time taken to separate into two or more layers or to form a precipitate. The results are also listed in Table 1. Next, an antifoam test was conducted using the antifoam composition shown in Table 1. First, there is a ball filter (Kinoshita type) on the bottom.
Pour 300 ml of slate factory wastewater into a 1 volume graduated cylinder equipped with a
Each cylinder was kept at 25°C and vented through a ball filter at a flow rate of 3 per minute for 30 minutes, during which time the amount of foaming was measured at predetermined intervals. The results are shown in Table 2. In addition, 300 ml of waste molasses with sugar content adjusted to 11% was placed in the graduated cylinder, placed in a constant temperature bath at 30°C, and aerated through a ball filter at a flow rate of 3 per minute until the foaming volume reached 300 ml. Sometimes Table 1
Add 300ppm of antifoam composition to
Aeration was continued for a minute, and the amount of foaming was measured at predetermined intervals during that time. The results are shown in Table 3. From the results in Table 1, it can be seen that the product of the present invention has superior water dispersibility compared to the comparative product. Moreover, from the results in Tables 2 and 3, it can be seen that the products of the present invention have a better antifoaming effect than the comparative products.

[Table] Note: Among the cases in which both ethylene oxide and propylene oxide are added, the numbers in { } indicate random adducts, and the others indicate block-like adducts.

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Claims (1)

[Scope of Claims] 1. An antifoaming agent comprising a composition containing the following components A and B. A: 50 to 90% by weight of vegetable oil, animal oil, mineral oil, synthetic oil or a mixture thereof that is liquid at room temperature B: Compounds 3 to 20 represented by the following general formula []
Weight% R ¹ O {(C ₃ H ₆ O) a (C ₂ H ₄ O) b} COR ²
...[] (However, R ¹ is an alkyl group or alkenyl group having 1 to 4 carbon atoms, R ² is an alkyl group or alkenyl group having 7 to 21 carbon atoms, a is 0-5, and b is 4-5.
20, the part inside { } may be a random addition, a block addition in an arbitrary order, or a combination thereof. 2. The antifoaming agent according to claim 1, wherein the composition further contains a 1% by weight aqueous solution having a cloud point of 50° C. or less or a water-insoluble nonionic surfactant of 30% by weight or less. 3. The antifoaming agent according to claim 1 or 2, wherein component A is soybean oil, rice bran oil, kerosene, spindle oil, liquid paraffin, rice bran fatty acid ester, or polybutene. 4. The antifoaming agent according to any one of claims 1 to 3, wherein R ¹ is a methyl group, an ethyl group, a propyl group, or a butyl group. 5. The antifoaming agent according to any one of claims 1 to 4, wherein ^R2CO is an acyl group of lauric acid, myristic acid, palmitic acid, stearic acid, or oleic acid. 6 component C is polyoxyethylene polyoxypropylene glycol, polyoxyethylene nonyl phenyl ether, polyoxypropylene butyl ether, propylene oxide adduct of glycerin, polyoxyethylene polyoxypropylene butyl ether, polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene The antifoaming agent according to any one of claims 1 to 5, which is oxyethylene polyoxypropylene stearyl ether, glycerin monooleate, or sorbitan monooleate.