JP2003116469A - Surfactant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surfactant capable of being formed into an aqueous solution having a low viscosity, even with a high concentration, and therefore capable of being extremely improved in its workability. SOLUTION: This surfactant contains (A) a sucrose fatty acid ester having a fatty acid with carbon atoms of 8-14 and/or a polyglycerol fatty acid ester and (B) a polyhydric alcohol fatty acid ester having a fatty acid with carbon atoms of >=16. A sucrose fatty acid ester, a glycerin fatty acid ester or a sorbitan fatty acid ester is preferably used as the polyhydric alcohol fatty acid ester (B). The components (A) and (B) are preferably contained in a weight ratio satisfying the formula: (A):(B)=0.1:99.9 to 50:50.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a surfactant comprising a polyhydric alcohol fatty acid ester.

[0002]

BACKGROUND OF THE INVENTION Polyhydric alcohol fatty acid esters such as sucrose fatty acid esters and polyglycerin fatty acid esters are used as emulsifiers, solubilizers and dispersion agents in various fields such as foods, pharmaceuticals and cosmetics. It is used as various surfactants such as agents. Conventionally, the polyhydric alcohol fatty acid ester usually used as a surfactant of this type has a constituent fatty acid of a long-chain fatty acid having 16 or more carbon atoms such as stearic acid and palmitic acid.

Generally, when such a water-soluble polyhydric alcohol fatty acid ester is used as an aqueous solution, the higher the concentration of the aqueous solution is, the higher the production efficiency is, but the higher the viscosity is, the more energy and time are required for the preparation of the aqueous solution. Not only is this required, but workability and efficiency deteriorate, such as difficulty in liquid transfer between processes. Therefore, it has been necessary to use a dilute aqueous solution having a low viscosity.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object thereof is to provide an aqueous solution having a high concentration and a low viscosity, and to greatly improve workability. The purpose is to provide a surfactant capable of

[0005]

Means for Solving the Problems The present inventors have made extensive studies in view of the above points, and as a result, when preparing an aqueous solution of sucrose fatty acid ester in which the above-mentioned conventional constituent fatty acids are stearic acid and palmitic acid, Constituent fatty acids have 8 to 14 carbon atoms
By using a small amount of sucrose fatty acid ester or polyglycerin fatty acid ester in combination, it was found that the viscosity of a concentrated aqueous solution is significantly reduced, and the present invention has been completed.

That is, the surfactant of the present invention is (A)
It contains a sucrose fatty acid ester and / or a polyglycerin fatty acid ester in which the constituent fatty acid has 8 to 14 carbon atoms, and (B) a polyhydric alcohol fatty acid ester in which the constituent fatty acid has 16 or more carbon atoms. .

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION [A component] The fatty acid ester used as the component (A) is a sucrose fatty acid ester and a polyglycerin fatty acid ester having a fatty acid having 8 to 14 carbon atoms as a constituent fatty acid. These sucrose fatty acid ester and polyglycerin fatty acid ester may be used alone or in combination. As constituent fatty acids,
Specific examples thereof include caprylic acid, capric acid, lauric acid and myristic acid, and these may be used alone or in combination of two or more.

The fatty acid ester as the component (A) is HLB.
(Hydrophilic / lipophilic balance) is preferably 11 or more, and more preferably HLB is 13 or more.

The polyglycerin fatty acid ester is
A fatty acid is ester-bonded to polyglycerin having an average degree of polymerization of 3 or more. The average degree of polymerization of the polyglycerin fatty acid ester is more preferably 5-10.

[B component] The constituent fatty acid in the polyhydric alcohol fatty acid ester of the component (B) is a fatty acid having 16 or more carbon atoms, and specific examples thereof include palmitic acid,
Saturated fatty acids such as stearic acid, arachidic acid and docosanoic acid, unsaturated fatty acids such as oleic acid, linoleic acid, linoleic acid, erucic acid and arachidonic acid, and the like,
These may be used alone or in combination of two or more. More preferably, the constituent fatty acid has 16 to 22 carbon atoms.

Examples of the polyhydric alcohol fatty acid ester as the component (B) include sucrose fatty acid ester, polyglycerin fatty acid ester, glycerin fatty acid ester such as monoglyceride, sorbitan fatty acid ester and the like. You may use together 1 or more types.

[Blending Ratio] The blending ratio of the above components (A) and (B) is (A) :( B) = 0.1: 9 by weight.
It is preferably 9.9 to 50:50. When the weight ratio of the component (A) is less than 0.1, it is difficult to obtain a sufficient viscosity reducing effect. On the other hand, if the weight ratio of the component (A) exceeds 50,
The ratio of the component (B) becomes low, and it becomes difficult to obtain the original surfactant effect.

That is, in the surfactant of the present invention, the component (B) is a component that exerts a surfactant effect.
The component (A) is a component that exerts the effect of lowering the viscosity of the aqueous solution without impairing the surfactant effect of the component (B). Therefore, a use form in which a small amount of the component (A) is mixed with the component (B) is preferable. Specifically, the mixing ratio of both components is (A) :( B) = 0.5: 99.5 by weight ratio. It is more preferably from 10:90.

[Others] The surfactant of the present invention is obtained by blending the above-mentioned components (A) and (B) and mixing them uniformly, and is usually used in the form of an aqueous solution. The aqueous solution may be prepared by adding a mixture of the components (A) and (B) to water and heating and dissolving it. Alternatively, an aqueous solution of the components (A) and (B) may be separately prepared and then mixed. Alternatively, it may be prepared by further preparing an aqueous solution of the component (B) and then adding and mixing the component (A) as it is.

When the surfactant of the present invention is used as an aqueous solution, its concentration is not particularly limited, but it is preferably used in an amount of 5% by weight or more, more preferably 5 to 15% by weight, in order to enhance production efficiency in various applications. , And more preferably 7 to 15% by weight.

In the surfactant of the present invention, by combining the components (A) and (B), the viscosity of the aqueous solution is 7% by weight or more, as shown in the examples below. (25 ° C.) can be 500 mPa · s or less. That is, the surfactant of the present invention has an aqueous solution viscosity of 500 mP at a concentration of 7% by weight.
The viscosity of the aqueous solution at a concentration of 10% by weight is preferably 250 mPa · s or less.

The component (A) which acts as a viscosity reducing agent in the surfactant of the present invention not only lowers the viscosity of the surfactant having high viscosity at such a high concentration, but also increases the viscosity of the surfactant having a low concentration. The viscosity of the activator can also be reduced. That is, in the surfactant of the present invention, (B)
The viscosity of the aqueous solution alone is greater than 500 mPa · s, whereas the viscosity of the aqueous solution can be reduced to 500 mPa · s or less by adding the component (A). It can be reduced to the following. Of course, even if the component (B) alone has an aqueous solution viscosity of 500 mPa · s or less, the component (A) can be added to reduce the aqueous solution viscosity.

The thus obtained surfactant of the present invention is used as various surfactants such as emulsifiers, solubilizers, dispersants, crystal growth inhibitors and wetting agents in the fields of foods, pharmaceuticals, cosmetics and the like. Can be used.

[0019]

EXAMPLES The present invention will now be specifically described with reference to examples, but the scope of the present invention is not limited to these. In this example, "%" means% by weight,
“Parts” means parts by weight.

Test Example 1 (Viscosity of Surfactant) Examples 1 to 7: As shown in Table 1 below, as component (A), sucrose fatty acid ester (SE) and polyglycerin fatty acid ester (PolyGE). SE, PolyGE, sorbitan fatty acid ester (SoE), and monoglyceride (MG) were used as the component (B) at the contents shown in Table 1 and mixed uniformly to prepare a surfactant. did. The obtained surfactant was added to tap water, dispersed at room temperature, heated and stirred to 70 ° C, and completely dissolved, then 25 ° C.
The mixture was cooled down to 10% to prepare an aqueous surfactant solution having a concentration of 10%.

Comparative Examples 1-6: As shown in Table 1 below, in Comparative Examples 1, 2, 5, and 6, only the component (B) used in the above Examples was used alone, and in Comparative Example 3, Instead of the component (A) of the present invention, a polyglycerin fatty acid ester whose constituent fatty acid is oleic acid is used, and in Comparative Example 4,
A surfactant was prepared by using diglyceric acid fatty acid ester (DiGE) instead of the component (A) of the present invention.
After adding the obtained surfactant to tap water and dispersing at room temperature, 70
The mixture was heated and stirred to 0 ° C, completely dissolved, and then cooled to 25 ° C to prepare an aqueous surfactant solution having a concentration of 10%.

Examples 1 to 7 and Comparative Example 1 prepared above
Viscosity was measured for ~ 6 aqueous surfactant solutions. The viscosity is measured by a B-type viscometer (Rotor-No.
2, 60 rpm × 60 seconds, 25 ° C.).
The results are shown in Table 1.

[0023]

[Table 1]

As shown in Table 1, as compared with Comparative Examples 1, 2, 5, and 6 in which the component (B) was used alone, in Examples 1 to 7 in which the component (A) and the component (B) were used in combination, The aqueous solution viscosity was greatly reduced. In Comparative Examples 3 and 4, (A)
The fatty acid ester itself used as a component had a low aqueous solution viscosity, like the component (A) of the present invention.
Even if this was added to the component (B), the effect of lowering the viscosity as in the present invention was not obtained, but rather the viscosity was increased.

As is clear from Examples 4 and 5,
When a polyglycerin fatty acid ester is used as the component (B), a sucrose fatty acid ester as the component (A) has a larger effect of reducing the viscosity of the aqueous solution.

[Test Example 2 (Manufacture of Milk Beverage)] The surfactants of Example 4 and Comparative Example 2 described above were used as emulsifiers of the following (1), and the following (2) to (4) were added thereto. Then, the mixture was heated and stirred, and then homogenized and sterilized, so that high-fat milk was produced.

(Composition of high-fat milk) (1) Aqueous emulsifier solution (10%) 10 parts (2) Vegetable oil and fat 10 parts (3) Fresh cream 60 parts (4) Skim milk powder 5.6 parts, sugar 0.5 parts 20 parts of an aqueous solution prepared by dissolving 0.1 part of potassium phosphate and 0.1 part of guar gum in 13.7 parts of water.

At the time of producing high-fat milk, an attempt was made to pump an emulsifier aqueous solution into a tank.
However, in Comparative Example 2, the viscosity was high and the liquid transfer was impossible.

The high-fat milk obtained by using the emulsifier of Example 4 is excellent in homogeneity and does not cause separation for a long period of time. Therefore, the emulsifier of Example 4 has excellent emulsification performance. Had.

[0030]

As described above, in the surfactant of the present invention, the polyhydric alcohol fatty acid ester as the component (B) has 8 to 14 carbon atoms in the constituent fatty acid as the component (A).
By adding the sucrose fatty acid ester and the polyglycerin fatty acid ester, the viscosity of the aqueous solution can be reduced and workability and efficiency can be remarkably improved.

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Claims (5)

[Claims] 1. A sucrose fatty acid ester and / or polyglycerin fatty acid ester in which (A) constituent fatty acid has 8 to 14 carbon atoms, and (B) constituent fatty acid has 1 carbon atom.
A surfactant containing a polyhydric alcohol fatty acid ester of 6 or more. 2. The surfactant according to claim 1, wherein the polyhydric alcohol fatty acid ester as the component (B) is at least one selected from the group consisting of sucrose fatty acid ester, glycerin fatty acid ester and sorbitan fatty acid ester. 3. The surfactant according to claim 1, wherein the HLB of the component (A) is 11 or more. 4. The weight ratio of the components (A) and (B) is (A) :( B) = 0.1: 99.9 to 50:50.
The surfactant according to any one of claims 1 to 3. 5. Aqueous solution viscosity (25 ° C.) of component (B) alone
Is more than 500 mPa · s, and the viscosity of the aqueous solution (25 ° C.) is reduced to 500 mPa · s or less by adding the component (A). 5. The surfactant according to claim 1, wherein .