WO2006011448A1

WO2006011448A1 - Emulsifier for vegetable oil

Info

Publication number: WO2006011448A1
Application number: PCT/JP2005/013578
Authority: WO
Inventors: Sadaaki Satou; Satoru Oobuchi
Original assignee: Toho Chemical Industry Co., Ltd.
Priority date: 2004-07-30
Filing date: 2005-07-25
Publication date: 2006-02-02
Also published as: CN1956772B; JPWO2006011448A1; CN1956772A; JP4461336B2

Abstract

[PROBLEMS] To attain excellent emulsification and emulsion stability in diluting a composition consisting of vegetable oil and a surfactant with water even when the amount of the surfactant is small. [MEANS FOR SOLVING PROBLEMS] An emulsifier for vegetable oil which contains as the essential components a polyoxyalkylene sorbitol fatty acid ester represented by the general formula (I): (I) [wherein n is 2 or 3, or a mixture of both (in this case, the two kinds of units are arranged at random or in block); m1 to m6 are such integers as to give a sum total of 10 to 50; and R1 to R6 are each acyl or hydrogen], and an alkaline earth metal salt of a dialkyl- or dialkenyl- sulfosuccinic acid.

Description

Specification

Emulsifier for vegetable oil

Technical field

The present invention relates to an emulsifier used for constituting a vegetable oil-containing composition using vegetable oil as a solvent or dispersion medium. In particular, the present invention relates to an emulsifier that can be preferably used for a biocide composition using vegetable oil.

Background art

Until now, biocides have been dissolved in aromatic hydrocarbons such as xylene, methylnaphthalene, kerosene, and highly polar methylpyrrolidone, isophorone, cyclohexanone, etc., and added with an emulsifier. However, these organic solvents often have problems with toxicity to human livestock and cause phytotoxicity to plants. Therefore, development of biocide compositions using highly safe vegetable oil instead of organic solvents has been attempted in recent years.

[0003] Vegetable oil has been used as a solvent and dispersion medium mainly in specific fields such as foods and cosmetics, but in recent years, from the viewpoint of environmental protection and safety, agricultural chemicals, environmental protection agents, metalworking fluids, release oils, etc. In the fields of molds and fiber oils, there is a growing need for the use of vegetable oils. Along with this, there is a strong demand for emulsifiers with good emulsification performance for vegetable oils.

[0004] However, vegetable oils are used in fields such as agricultural chemicals, such as agricultural chemicals, in which emulsification and retention of emulsion stability when diluted with water are very difficult due to poor compatibility with surfactants that are emulsifiers. It is quite easy to obtain a practical level of emulsification performance.

[0005] Under such circumstances, blends of nonionic surfactants such as polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, polyoxyethylene alkyl ethers and the like have been mainly used even though they are insufficiently emulsified. Known documents of emulsifiers for vegetable oil include Patent Document 1, Patent Document 2, and the like.

[0006] Patent Document 1 describes the use of a polyoxyalkylene sorbitol fatty acid ester as a component of an emulsifier for vegetable oil for cosmetic applications. However, the blending ratio of the emulsifier to the plant oil is as high as 20%. Emulsification is possible only with water. In addition, although the emulsifier contains a slight amount of anionic surfactant, it is composed mainly of a polyoxyalkylene sorbitol fatty acid ester as a main component so that only nonionic surfactants can be used in various application fields. It does not satisfy emulsifiability.

[0007] On the other hand, Patent Document 2 describes that a good emulsification can be obtained with respect to vegetable oils by blending dialkyl or dialkenyl sulfosuccinic acid alkaline earth metal salts with various nonionic surfactants. Has a large amount of emulsifier in order to obtain good emulsification. In the examples described in Patent Document 2, 20 parts by weight of emulsifier is used for 80 parts by weight of vegetable oil, or 15 parts by weight of emulsifier for 85 parts of vegetable oil, and the blending ratio of the emulsifier is high.

Patent Document 1: Japanese Patent Publication No. 53-9597

Patent Document 2: JP-A-7-299346

Disclosure of the invention

Problems to be solved by the invention

[0008] When emulsifying vegetable oil, adding a large amount of an emulsifier as an auxiliary agent is not preferable because it reduces the content of vegetable oil that serves as a solvent 'dispersion medium, and is not economical. .

Accordingly, an object of the present invention is to obtain a good emulsification and emulsification stability when the vegetable oil and the emulsifier are used without using a large amount of the emulsifier and are diluted with water.

As a result of diligent research to solve the above-mentioned problems, the present inventors are compatible with vegetable oils, and when a blend of vegetable oil and emulsifier is diluted in water, good emulsification and emulsion stability can be obtained. An emulsifier that can be used has been developed and the present invention has been completed.

Means for solving the problem

That is, the present invention provides a polyoxyalkylene sorbitol fatty acid ester represented by the following general formula (I):

[Chemical 1]

(Where n means 2 or 3 or a mixture (random or block), m to m are

1 6

, An integer whose sum is between 10 and 50. R ^{1 to} R ⁶ are any one of 1 to 6 saturated or unsaturated acyl groups having 8 to 22 carbon atoms, and the rest are hydrogen atoms), and dialkyl or dialkyl sulfosuccinic acid alkaline earth An emulsifier for vegetable oils containing a metal salt as an essential component.

The invention's effect

[0010] According to the present invention, vegetable oil can be easily emulsified and kept emulsified for a long time without using a large amount of surfactant as an emulsifier. The emulsifier of the present invention has good compatibility with vegetable oil. As an application example of the present invention, a biocide composition with reduced environmental load can be obtained by blending a biocidal component with the vegetable oil and the emulsifier of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail.

The polyoxyalkylene sorbitol fatty acid ester in the present invention has a saturated or unsaturated acyl group having 8 to 22 carbon atoms and has 10 to 50 oxyalkylene units. It is preferable to use a compound having 3 to 5 acyl groups derived from several 16 palmitic acids or stearic acid or oleic acid having 18 carbon atoms. Among them, the use of a compound having 3 to 5 acyl groups derived from oleic acid is particularly preferred from the viewpoint of excellent emulsifiability with respect to vegetable oil and relatively good fluidity.

[0012] The dialkyl or dialkenyl sulfosuccinic alkaline earth metal salt in the present invention is A linear or branched alkyl group having 6 to 22 carbon atoms or an alkenyl group is preferable, and an alkyl group having 6 to 12 carbon atoms is particularly preferable. Alkaline earth

[0013] Among the anionic surfactants, dialkyl or dialkal sulfosuccinic acid alkaline earth metal salts are particularly effective from the viewpoint of compatibility with vegetable oils and emulsification. Dialkyl or dialkal sulfosuccinic acid alkali metal salts have the power of emulsifying performance. They do not reach dialkyl or dialkal sulfosuccinic acid alkaline earth metal salts! An anionic surfactant containing an aryl group such as alkylbenzene sulfonate has low compatibility with vegetable oils, but may be used as long as the effect of the present invention is not impaired.

[0014] The emulsifier for vegetable oils of the present invention contains a nonionic surfactant polyoxyalkylene sorbitol fatty acid ester and an anionic surfactant dialkyl or dialkylsulfo succinic acid alkaline earth metal salt. It is essential, and even if one of them is missing, emulsion with good emulsification and emulsion stability cannot be obtained.

[0015] That is, polyoxyalkylene sorbitol fatty acid ester is one of the effective emulsifier components for vegetable oils, but more specific anionic surfactants (dialkyl or dialkal sulfosuccinic acid alkaline earth metal salts). Can be used to achieve good emulsification and emulsion stability even when the blending ratio of the emulsifier to the vegetable oil is 10%, and the water hardness of the diluted water is 3 to 19.2 degrees. can do. Here, the fact that the water hardness can be adjusted to 19.2 degrees indicates that it can be applied to water with high hardness overseas.

[0016] The polyoxyalkylene sorbitol fatty acid ester (referred to as A) and the dialkyl or dialkalsulfosuccinic acid alkaline earth metal salt (referred to as B) contained in the milky additive for vegetable oils have excellent emulsifying properties From the viewpoint of obtaining stability, it can be preferably used in a mass ratio of 8: in the range of 10 to 90:90 to 10. It is particularly preferable that 8: 8 is in the range of 25 to 75:75 to 25 in terms of mass ratio.

[0017] The synthesis of the polyoxyethylene sorbitol fatty acid ester according to the present invention can be performed by a known method. ) Alkaline touch Reaction is carried out under a medium to obtain polyoxyethylene sorbitol. Further, the compound is reacted with fatty acid under an alkali catalyst at a temperature of 220 to 230 ° C. to obtain the desired polyoxyethylene sorbitol fatty acid ester. As is apparent from the reaction process, the surfactant does not have a cyclic structure such as polyoxyethylene sorbitan fatty acid ester, and therefore has a particular affinity with various vegetable oils that also have no cyclic structure. It is assumed that the emulsification performance is excellent.

[0018] The emulsifier for vegetable oil of the present invention further comprises a polyoxyethylene castor oil having 1 to 60 oxyethylene units, a polyoxyethylene hydrogenated castor oil having 1 to 60 oxyethylene units, and a carbon number of 8 to 22. Fatty acid glyceride having an acyl group, sorbitan fatty acid ester having an acyl group of 8 to 22 carbon atoms, polyoxyethylene sorbitan fatty acid ester power having an acyl group of 10 to 30 oxsitylene units and 8 to 22 carbon atoms is also selected. One kind or two or more kinds can be contained. The emulsifiers containing these compounds, even if the amount of emulsifier used relative to the vegetable oil is very small compared to conventional emulsifiers (specifically, for example, 90 parts vegetable oil and 10 parts emulsifier), when diluted with water In addition, an oil-in-water type (oZw type) of very good emulsification and emulsion stability can be obtained.

[0019] The polyoxyethylene castor oil having 1 to 60 oxyethylene units or the polyoxyethylene hydrogenated castor oil having 1 to 60 oxyethylene units contained in the emulsifier for vegetable oil has excellent emulsifiability and emulsification. From the viewpoint of obtaining stability, the mass ratio in the emulsifier is preferably in the range of 0 to 65%, particularly preferably in the range of 0 to 45%.

In addition, fatty acid glycerides having an acyl group having 8 to 22 carbon atoms or sorbitan fatty acid esters having an acyl group having 8 to 22 carbon atoms contained in the emulsifier for vegetable oil have excellent emulsifiability and emulsion stability. From the viewpoint of obtaining, it is preferable that the mass ratio of the emulsifier is in the range of 0 to 65%, and particularly in the range of 0 to 45%.

Sarakuko, polyoxyethylene sorbitan fatty acid ester having 10 to 30 oxyethylene units and 8 to 22 carbon acyl groups contained in the emulsifier for vegetable oils, has excellent emulsifiability and emulsion stability. In the emulsifier, the mass ratio is 0 to 20%. It is particularly preferable to be in the range of 0 to 10%.

[0020] The emulsifier for vegetable oil of the present invention includes dialkyl or dialkal sulfosuccinic acid alkali metal salt, polyglycerin fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene castor oil fatty acid ester, polyoxyethylene hydrogenated castor oil fatty acid ester. In addition, surfactants such as polyoxyalkylene alkyl ethers and sucrose fatty acid esters may be combined. Furthermore, the surfactant combined with the emulsifier for vegetable oil of the present invention is not particularly limited, and any one of an anionic surfactant, a nonionic surfactant, a cationic surfactant, and an amphoteric surfactant can be used. Can also be used.

[0021] The vegetable oils that are the subject of the present invention are preferably soybean oil, corn oil, and rapeseed oil, but are not limited to these, and are all derived from plants such as palm oil, sunflower oil, castor oil, cottonseed oil, olive oil, and the like. Can be applied to any oil. Further, a mixture of these vegetable oils and fatty acid methyl esters made from the fatty acids of animal and vegetable oils may be targeted. In the field of agricultural chemicals that use biocides, biocide preparations such as emulsions, oil-based flowables (SC), and suspensions (SE) can be obtained by adding further biocides in these vegetable oil and emulsifier compositions. In addition, microemulsions, pastes and emulsion preparations (EW) can be obtained, and an emulsion obtained by emulsifying vegetable oil in water can be used as a biocide efficacy enhancer, that is, an adjuvant.

[0022] In the present invention, a biocide composition can be prepared by blending a biocidal component in a mixed solution of the vegetable oil and the emulsifier for the vegetable oil.

The biocidal component contained in the mixed solution is not limited to solid and liquid, and can be used for various insecticides, fungicides, herbicides, etc., and can be used alone or in combination. However, it is not limited to the above killed generation.

[0023] Furthermore, in addition to the surfactants and biocides described above, auxiliary agents such as solvents, carriers, decomposition inhibitors, thickeners, and antifreeze agents are added to the mixed solution of vegetable oil and the present vegetable oil emulsifier. It's okay.

[0024] When the vegetable oil emulsifier in the present invention is used in a biocide composition, changes in the type of biocidal component to be blended, the form of the biocidal product (solid, liquid), the amount of biocidal product blended, etc. This changes the emulsification performance of the emulsifier for vegetable oil. For this reason, the optimum blending ratio of each component in the emulsifier for vegetable oil is selected in consideration of the change in emulsification performance due to these.

As an example, polyoxyalkylene sorbitol fatty acid ester 10 to 20 parts by mass, dialkyl or dialkal sulfosuccinic acid alkaline earth metal salt 10 to 30 parts by mass, polyoxyethylene castor oil having 1 to 60 oxyethylene units or 20 to 45 parts by mass of polyoxyethylene hydrogenated castor oil having 1 to 60 oxyethylene units, fatty acid glyceride having an acyl group having 8 to 22 carbon atoms, or sorbitan fatty acid ester having an acyl group having 8 to 22 carbon atoms An emulsion for vegetable oil containing 20 to 45 parts by mass, or 0 to 10 parts by mass of a polyoxyethylene sorbitan fatty acid ester having 10 to 30 oxyethylene units and an acyl group having 8 to 22 carbon atoms. Prepare 10 parts of the emulsifier for vegetable oil, 80 parts of vegetable oil, and 10 parts of killed product. Such, it is possible to prepare the biocide composition.

However, the blending ratio is merely an example, and the blending ratio of each component in the biocide composition in the present application is not limited to the above numerical values.

[0025] The emulsification method of the vegetable oil blended with the emulsifier according to the present invention, and there is! /, The emulsification method of the biocide composition of the present invention blended with the vinegar and the biocidal product according to the present invention in the vegetable oil is particularly limited. It ’s not something that ’s done. Without using a special machine such as a high-pressure emulsifier or a colloid mill, or without a special emulsification step such as a phase inversion emulsification method, it can be easily emulsified with a simple mixing device.

Example

[0026] Hereinafter, the present invention will be further described with reference to examples. However, the present invention is not construed as being limited to these examples. Moreover, the part used here shows a mass part.

[0027] (Example 1)

[Table 1] Polyoxyethylene (20 mol) sorbitol mono-trioleate estenole 15.0 parts Polyoxyethylene (10 mol) Hard castor oil 40.0 parts Oleic acid monodaricide 20.0 parts Dioctyl Magnesium sulfosuccinate 25.0 parts The composites shown in Table 1 above were mixed and stirred at the above mixing ratio to obtain an emulsifier.

[Example 2]

[¾2] Polyoxyethylene (30 mol) Sorbitol tetraoleate 1 9 Polyoxyethylene (10 mol) Hardened castor oil 3 7 Monooleic acid oleate 2 5 Calcium dioctylsulfosuccinate 1 9 As shown in Table 2 above The resulting compound was mixed and stirred at the above mixing ratio to obtain an emulsifier.

[0029] (Example 3)

[Table 3] Polyoxyethylene (40 mol) Sorbitol tetraoleate 1 4. Polyoxyethylene (10 mol) Castor oil 3 6. Sorbitan monooleate 2 7. Calcium dioctylsulfosuccinate 2 3 The compound shown in Table 3 was mixed and stirred at the above mixing ratio to obtain an emulsifier.

[0030] (Example 4)

[Table 4] Polyoxyethylene (30 mol) sorbitol tetraoleate 1 8. oooo ο ο ο ο ο ο ο ο ο ο ο a polyoxyethylene (10 monole) Hardened castor oil 3 2. Sorbitan Monooleate 3 2. Calcium dioctylsulfosuccinate 1 8. The compounds shown in Table 4 were mixed and stirred at the above mixing ratio to obtain an emulsifier.

[0031] (Example 5)

[¾5] Polyoxyethylene (40 mol) sorbitol tetraoleate 1 0. Polyoxyethylene (10 mol) hydrogenated castor oil 3 0. Sonolebitan monooleate estenole 4 0. Calcium dioctinoresulfosuccinate 2 0. The compounds shown in Table 5 were mixed and stirred at the above mixing ratio to obtain an emulsifier.

[Example 6] [Table 6] Polyoxyethylene (30 mol) Sorbitol tetraoleate 1 6. Polyoxyethylene (10 monole) Hardened castor oil 2 7. Sorbitan monooleate 4 3. Polyoxyethylene (20 monole) ) Sonorebitan monooleate estenole 3. Calcium dioctylsulfosuccinate 11. The compounds shown in Table 6 above were mixed and stirred at the above mixing ratio to obtain an emulsifier.

(Comparative Example 1)

[Table 7] Polyoxyethylene (10 mol) hydrogenated castor oil 8 1 Calcium dioctyl sulfosuccinate 1 3 Polyoxyethylene (10 mol) sorbitan monooleate 6 The compounds shown in Table 7 above An emulsifier was obtained by mixing and stirring at a mixing ratio.

(Comparative Example 2)

[Table 8] Polyoxyethylene (30 mol) Sonolebitol tetraoleate _{non im} ethanol

Sodium oleate 1.0 parts Oleic acid 7.0 parts The compounds shown in Table 8 above were mixed and stirred at the above mixing ratio to obtain an emulsifier.

[0035] [Test method]

Various tests were conducted on vegetable oil using the emulsifiers having the compositions shown in Examples 1-6 and Comparative Examples 1-2.

[0036] (1) Compatibility of emulsifier and vegetable oil

At 20 ° C, 90 parts of soybean oil and 10 parts of each of the emulsifiers of Examples 1 to 6 and Comparative Examples 1 and 2 were taken in a beaker, stirred and mixed with a glass rod, and the appearance after 3 minutes was visually observed. . The test results are shown in Table 9.

[0037] (2) Emulsifying property of vegetable oil formulation consisting of emulsifier and vegetable oil

Vegetable oil comprising 90 parts of soybean oil and 10 parts of each emulsifier of Examples 1-6 and Comparative Examples 1-2 Microtrac Ultrafine Particles that are particle size analyzers at 20 ° C after the formulation is diluted 100-fold with water with a water hardness of 3 ° C or 19.2 ° C at a water temperature of 20 ° C and inverted 30 times per minute Emulsion particles were measured with a particle size analyzer (W) [Model: 9340 UPA150, Nikkiso Co., Ltd.] (measurement range: 0.0032 to 6.54 m). When the cumulative curve is calculated with the total volume of the measured emulsion particles as 100%, the particle size at the point where the cumulative curve value is 10%, 50%, and 90% is used as the experimental result. Judged. The emulsifiers of Comparative Examples 1 and 2 were tested not only for soybean oil Z emulsifier = 90 parts Z10 parts but also 80 parts Z20 parts. The test results are shown in Table 10.

[0038] (3) Emulsification stability of vegetable oil formulation consisting of emulsifier and vegetable oil

A vegetable oil formulation consisting of 90 parts of soybean oil and 10 parts of each of the emulsifiers of Examples 1 to 6 and Comparative Examples 1 to 2 was diluted 20 times with 15 ° C 3 ° hard water or 30 ° C 19.2 ° hard water. The mixture was inverted and mixed 30 times per minute in a cylinder with a 100 ml stopper, and allowed to stand, and the degree of separation of the emulsion after 1 hour and 2 hours was checked. The test results are shown in Table 11.

[0039] (4) Appearance and emulsification stability of a biocide composition obtained by adding a biocidal component to an emulsifier and vegetable oil

80 parts of soybean oil at 20 ° C, 10 parts of each emulsifier of Examples 1-6 and Comparative Examples 1-2, S-1,2-bis (ethoxycarbol) ethyl O, O- Prepare ₁₀ parts of dimethylphosphorothioate (insecticide) in a beaker and stir and mix with a glass rod to prepare a biocide. The appearance after 3 minutes was visually observed. Next, each biocide prepared was diluted 20 times with 15 ° C 3 ° hard water or 30 ° C 19.2 ° hard water, and inverted 30 times per minute in a 100 ml stoppered cylinder. After that, the mixture was allowed to stand, and the degree of separation of emulsion after 1 hour and 2 hours was checked. The test results are shown in Table 12.

[0040] [Test results]

The test results are shown below.

[0041] [Table 9] Compatibility of emulsifier and vegetable oil (tested at 20 ° C)

* 〇 ○ is a transparent liquid at 20 ° C (good compatibility).

*? X has turbidity at 20 ^a C (poor compatibility).

[0042] [Table 10]

[0043] [Table 11] Emulsification stability of vegetable oil formulation consisting of emulsifier and vegetable oil

Cream layer separation [ml] Emulsifier used Temperature [. c] Water quality

1 hour later 2 hours later Example 1 Formulated emulsifier 15 3 degree hard water 0 0 Example 2 Formulated emulsifier 15 3 degree hard water 0 0 Example 3 Formulated emulsifier 15 3 degree hard water 0 0 Example 4 Formulated emulsifier 15 3 degree hard water 0 0 Example 5 Formulated emulsifier 15 3 degree hard water 0 0 Example 6 Formulated emulsifier 15 3 degree hard water 0 1.0 Comparative example 1 Formulated emulsifier 15 3 degree hard water 2.0 3.0 Comparative example 2 Formulated emulsifier 15 3 degree hard water 3.0 4.0 Example 1 Formulated emulsifier 30 19.2 degree hard water 0 1.0 Example 2 formulated emulsifier 30 19.2 degree hard water 0 1.0 Example 3 formulated emulsifier 30 19.2 degree hard water 0 1.0 Example 4 formulated emulsifier 30 19.2 degree hard water 0 1.0 Example 5 formulated emulsifier 30 19.2 degree hard water 0 1.0 Example 6 Formulated emulsifier 30 19.2 degree hard water 0 0 Comparative example 1 Formulated emulsifier 30 19.2 degree hard water 2.0 3.0 Comparative example 2 Formulated emulsifier 30 19.2 degree hard water 3.0 4.0

Appearance and emulsification stability of biocide composition with emulsifier and vegetable oil added with biocide

○ is a transparent liquid (good compatibility) at 20 ° C.

* 4 X has turbidity at 20 ° C (poor compatibility). As the above test results show, according to the present invention, vegetable oil can be easily emulsified and maintained in an emulsified state for a long time without using a large amount of surfactant as an emulsifier. The emulsifier of the present invention has good compatibility with vegetable oil. Then, it is confirmed that even when the biocide is further added to the emulsifier and vegetable oil of the present invention, good emulsification performance is exhibited.

Claims

Claims [1] An emulsifier for vegetable oil comprising, as essential components, a polyoxyalkylene sorbitol fatty acid ester represented by the following general formula (I) and a dialkyl or dialkal sulfosuccinic acid alkaline earth metal salt.

[Chemical 1]

(Where n means 2 or 3 or a mixture (random or block), m to m

1 6 is an integer whose sum is between 10 and 50. R ^{1 to} R ⁶ are any one to 6 of a saturated or unsaturated acyl group having 8 to 22 carbon atoms, and the rest are hydrogen atoms)

[2] In addition to the polyoxyalkylene sorbitol fatty acid ester represented by the general formula (I) according to claim 1 and the alkaline earth metal salt of dialkyl or dialkylsulfosuccinate, saturated or unsaturated carbon As essential components, fatty acid glycerides having an acyl group of 8 to 22 and polyoxyethylene castor oil having 1 to 60 oxyethylene units or polyoxyethylene hydrogenated castor oil having 1 to 60 oxyethylene units Contains vegetable oil emulsifiers.

[3] In addition to the polyoxyalkylene sorbitol fatty acid ester represented by the general formula (I) according to claim 1 and the alkaline earth metal salt of dialkyl or dialkylsulfosuccinate, saturated or unsaturated carbon Essential components are sorbitan fatty acid esters having 8 to 22 acyl groups and polyoxyethylene castor oil having 1 to 60 oxyethylene units or polyoxyethylene hydrogenated castor oil having 1 to 60 oxyethylene units. As an emulsifier for vegetable oil.

[4] In addition to the polyoxyalkylene sorbitol fatty acid ester represented by the general formula (I) according to claim 1 and the alkaline earth metal salt of dialkyl or dialkylsulfosuccinate, saturated or unsaturated carbon Sorbitan fatty acid ester having an acyl group having 8 to 22 and polyoxyethylene sorbitan having 10 to 30 oxyethylene units and having a saturated or unsaturated acyl group having 8 to 22 carbon atoms An emulsifier for vegetable oil containing fatty acid ester and polyoxyethylene castor oil having 1 to 60 oxyethylene units or polyoxyethylene hydrogenated castor oil having 1 to 60 oxyethylene units as essential components.

[5] A biocide composition comprising a vegetable oil containing the emulsifier for vegetable oil according to any one of claims 1 to 4, wherein the biocidal component is compatible or dispersed.