JPH08319500A - Liquid neutral detergent composition of high concentration - Google Patents

Abstract

PURPOSE: To obtain a liquid neutral detergent composition of a high concentration which neither thickens nor gels and can be uniformly diluted with water by blending a specified surfactant component and a specified solvent component so as to provide specified properties. CONSTITUTION: This composition is obtained by blending 85-95wt.% surfactant component consisting essentially of 30-70wt.% anionic surfactant comprising a salt obtained from an 8-16C linear alkyl sulfonate and an ethanolamine represented by the formula Hm N(CH2 CH2 OH)n (wherein m is 0 to 2 and n is 1 to 3), 5-40wt.% nonionic surfactant comprising a compound represented by the formula R-O(CH2 CH2 O)n H (wherein R is a 8-16C alkyl group; and n is 2 to 18) and 10-50wt.% nonionic surfactant comprising a compound represented by the formula R-CON(CH2 CH2 OH)2 (wherein R is a 8-16C alkyl or alkenyl group) with 5-15wt.% of at least one solvent component selected from among ethanol, propylene glycol and polyethylene glycol, and it contains no water and has a viscosity (at 20 deg.C) of at most 1,000mPa.S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-concentration liquid neutral detergent composition which does not contain water or inorganic salts in its composition, for example, for commercial dishwashing.

[0002]

2. Description of the Related Art Conventionally, a dishwashing detergent for commercial use is filled in a metal container called an Ito can (capacity 18 liters) whose inner surface is coated with a plastic film, and these containers are exclusively disposed of. However, with the recent tightening of regulations on waste disposal, the disposal cost has risen sharply, so that metal containers are gradually being replaced by plastic containers.

On the other hand, regarding plastic containers,
It is used in a wide range of industries because of its advantages such as moldability, light weight, purchase cost, etc., but in recent years, due to the problem of incompatibility of plastics in the natural world, measures to reduce the amount used are urgently needed. . Against this background, in the detergent industry, as a measure to reduce the total amount of containers to be disposed of, it is partly practiced to collect and reuse the containers with the shape left, but this is extremely rare. That is the case. The recent movement in the industry is to reduce the size and packaging of easy-to-use plastic containers as demanded by users.

There is also an attempt to use a paper container whose inner surface is laminated with a thin plastic film,
This is welcomed by users as it can be disposed of as ordinary municipal waste after use.

However, these measures cannot be said to be sufficient while achieving a certain result as a measure for reducing the total amount of container disposal, and in combination with these measures, efforts to increase the concentration of detergent have become concrete. There is.

As an example of increasing the concentration of a detergent, it is possible to adjust the concentration to about 50 to 60% by weight by increasing the blending amount of the surfactant in the blending composition and reducing water relatively.
It is technically possible. In such a high-concentration detergent composition, technical development efforts have been made to eliminate discomfort to the user by making appearance, viscosity and other properties at conventional use concentrations similar to those of conventional products. −
High-concentration neutral detergent compositions are disclosed in JP-A-179298, JP-A-5-320698 and the like.

[0007]

As described above, some attempts have been made to increase the concentration of detergents, but no high-concentration products that can be expected to have sufficient effects have been obtained. Not in a stage.

Moreover, conventionally known high-concentration products are
All of them are water-containing compositions, and there are some problems in the system containing these waters. That is, as long as the system is one in which water is mixed, the higher the detergent component concentration, the more rapidly the viscosity increases, or the more difficult the solution preparation becomes, such as gelation.

For example, most of the liquid neutral detergents that are usually commercially available have a surfactant concentration of 13 to 13 as an active ingredient.
It is set to 20% by weight. And the others are composed of water and some inorganic salts, and the viscosity of such a detergent is 250 on average in relation to the kind of the activator to be blended.
It is generally adjusted to a relatively viscous liquid of about 600 mPa · S. The viscosity is 1000 to 1400.
Although there are some with high mPa · S, in general, when a high-concentration liquid detergent is metered and diluted for use, such a high viscosity causes a problem that the above constant meter becomes very troublesome. There is.

Further, in the case of a highly viscous detergent containing water as described above, it is necessary to add a drug other than the active ingredient, which does not contribute to the original detergency in preparing a solution.
The safety of the effects of these agents remaining on dishes and skin must be proved, which causes a new problem of guaranteeing the quality stability of detergents.

Further, the conventional high-concentration liquid neutral detergent containing water has a problem that spoilage bacteria are generated due to water.

The present invention has been made in view of the above circumstances, and contains a high-concentration surfactant component, does not contain water in its composition, and is a high-concentration liquid prepared to have a certain viscosity or less for easy handling. It is an object of the present invention to provide a neutral detergent composition.

[Means for Solving the Problems]

In order to achieve the above object, the high-concentration liquid neutral detergent composition of the present invention comprises (a) an average carbon number of 8 to 16
And a sulfonic acid having a linear alkyl group of the formula H _m N (CH ₂ CH ₂ OH) _n , (wherein m = 1 to 3,
30 to 70% by weight of an anionic surfactant consisting of a sulfonic acid ethanolamine salt obtained with ethanolamine represented by n = 1 to 3), and (b) the general formula R-O (CH
₂ CH ₂ O) _n H, (wherein R is a linear or branched alkyl group having an average carbon number of 8 to 16; n = 2 to 18) and is a nonionic polyoxyethylene alkyl ether. 5 to 40% by weight of surfactant, (c) general formula RC
ON (CH ₂ CH ₂ OH) ₂ , 10 to 50% by weight of a nonionic surfactant consisting of a fatty acid alkanolamide represented by (wherein R is an alkyl or alkenyl group having an average carbon number of 8 to 18) The surfactant component containing the above three components as essential components is blended at a concentration of 85 to 95% by weight with respect to the entire composition, and at least one selected from the group consisting of ethanol, propylene glycol and polyethylene glycol. A high-concentration liquid neutral detergent composition comprising a solvent component in a concentration of 5 to 15% by weight,
The composition does not contain water and has a composition viscosity at 20 ° C. of 1000 mPa · S or less.

And, preferably, the surfactant component is 1
The viscosity of an aqueous solution obtained by diluting the above composition to 5% by weight is less than 70 mPa · S at 25 ° C. That is, when the viscosity is less than 70 mPa · S, the liquid becomes a free-flowing liquid which is almost similar to water, and therefore, when the hand-held dispenser pump is filled with this liquid and used, the liquid has a merit that it is easy to move and push out. . It also has the advantage of requiring low transport pressures when pumping detergent from a single detergent source to multiple locations (eg, individual sinks in the kitchen).
In addition, since it does not feel sticky when used, it has good defoaming,
It also has the advantage of meeting the needs of consumers against the backdrop of safety-oriented and increasing awareness of environmental conservation.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described.

The anionic surfactant (a) used in the present invention is blended in order to secure desired detergency based on the above-mentioned use, and is a linear alkyl group having an average carbon number of 8 to 16. With sulphonic acid and the general formula H _m N
(CH ₂ CH ₂ OH) _n , (wherein m = 1 to 3 and n = 1
To 3) an anionic surfactant consisting of an ethanolamine salt of sulfonic acid obtained with ethanolamine is used. As the sulfonic acid, linear alkylbenzene sulfonic acid is suitable, and as the ethanolamine, monoethanolamine, diethanolamine, triethanolamine and the like can be mentioned. In addition,
The sulfonic acid ethanolamine salt may be used alone or in combination of two or more kinds.

The blending ratio of the anionic surfactant (a) must be set to 30 to 70% by weight (hereinafter abbreviated as "%"). That is, if it exceeds 70%, the detergency of the cleaning liquid obtained by diluting the highly concentrated liquid with water to a certain extent is not affected, but the target composition viscosity (2
0 ° C) greatly exceeds 1000 mPa · S,
This is because the adjustment becomes difficult and the handling during dilution becomes difficult. On the other hand, if it is less than 30%, the expected detergency cannot be obtained when used for the intended purpose of the present application.
In addition, it is suitable to set it in 50-70% also in the said mixing ratio.

Further, the nonionic surfactant (b) used in the present invention has extremely high detergency when it is used as a highly concentrated liquid obtained by blending it and when it is diluted with water to a certain extent. is the solution viscosity without causing are prepared so that a low pass range, is blended in order to facilitate handling, the general formula _{R-O (CH 2 CH 2} O) n H, ( wherein, R is an average number of carbon atoms 8-16 linear or branched alkyl group, n =
The polyoxyethylene alkyl ether represented by 2 to 18) is used. In addition, it is particularly preferable to use one having an addition number of ethylene oxide of 3 to 12 mol.

The mixing ratio of the nonionic surfactant (b) must be set to 5-40%. That is,
This is because if it exceeds 40%, it becomes difficult to secure a certain level of detergency, and if it is less than 5%, it is difficult to obtain the effect for viscosity adjustment. In addition, it is suitable to set it in 10-25% also in the said mixing ratio.

Further, the nonionic surfactant (c) used in the present invention is blended to improve the detergency and emulsifying power against oil and fat stains, but it is also very effective in adjusting the viscosity. Is. Further, it is also known about the effect of mitigating skin irritation and giving a mild feeling (JP-A-53-96007, etc.). It is also effective in controlling foam breakage and fine foam control. Examples of the nonionic surfactant (c) include those represented by the general formula R-CO.
N (CH ₂ CH ₂ OH) ₂ , (wherein R is an average carbon number of 8
The fatty acid alkanolamide represented by (about 18 to the alkyl group or alkenyl group) is used.

The blending ratio of the nonionic surfactant (c) must be set to 10 to 50%. That is, when it exceeds 50%, the balance with other surfactant components is poor, the detergency is reduced, and the practicality becomes poor.
On the other hand, if it is less than 10%, the resulting cleansing agent will be extremely irritating to the skin and the foam breakage will be worse. In addition, 10 to 25% of the above mixing ratio
It is preferable to set to.

The high-concentration liquid neutral detergent composition of the present invention comprises:
Since the above-mentioned three kinds of surfactant components are contained as essential components, other known surfactant components and the like can be appropriately blended therewith. However, above 3
The concentration of the total surfactant component, including the type of surfactant component, in the composition must be set to 85-95%. That is, if it exceeds 95%, the viscosity becomes too high and the desired viscosity characteristics cannot be obtained. On the contrary, if it is less than 85%, the effect due to the concentration of the detergent, such as making the container compact, is poor. is there.

In the high-concentration liquid neutral detergent composition of the present invention, it is necessary to use a solvent component such as ethanol, propylene glycol, polyethylene glycol alone or in combination of two or more kinds. is there. These solvent components are components necessary for maintaining a low viscosity even though the composition does not contain water, and the concentration thereof is set to 5 to 15%. This concentration range is set by the balance with the concentration range of the surfactant component. Among these solvents, it is preferable to use a mixed solvent in which ethanol and propylene glycol are mixed at a ratio of 2: 1.

The high-concentration liquid neutral detergent composition of the present invention thus obtained has a high concentration of 85% or more of the surfactant component, so that the container becomes compact as compared with the conventional one and the container It is possible to reduce the burden associated with the disposal process. Moreover, since it contains no water, it has excellent storage stability. Also, despite the high concentration,
Since the viscosity is suppressed to 1000 mPa · S or less at 20 ° C., handling such as dilution is easy and uniform dilution is possible.

Among the high-concentration liquid neutral detergent compositions of the present invention, the anionic surfactant (a) is used in an amount of 50.
.About.70%, 10 to 25% of a nonionic surfactant (b) composed of polyoxyethylene alkyl ether, and 10 to 25% of a fatty acid alkanolamide (c) are diluted with this composition by 15%. 2 of the aqueous solution obtained by
The viscosity at 5 ° C becomes less than 70 mPa · S, and the viscosity is remarkably reduced. Therefore, when used, it does not have a sticky feel, and gives a refreshing feeling of use and excellent defoaming. It has been conventionally said that such a low-viscosity type cleaning agent is not preferable because it leads to excessive use of the cleaning agent, but in recent years, due to safety-consciousness and increasing awareness of environmental conservation, the cleaning agent has a smooth surface. It is an advantageous property for meeting such new needs, as is being favored. In addition, since it becomes a liquid that is almost like water, it has an advantage that the liquid is easy to move and the pushing operation is easy to perform when the hand-held dispenser pump is filled and used. It also has the advantage of requiring low transport pressures when pumping detergent from a single detergent source to multiple locations (eg, individual sinks in the kitchen).

[0026]

Industrial Applicability As described above, the high-concentration liquid neutral detergent composition of the present invention has a surfactant component concentration of 85 in a detergent used for washing dishes, cooking utensils, vegetables, fruits and the like. Since it is a highly concentrated product of ˜95% and does not contain water in the composition, it is possible to prevent spoilage bacteria caused by water from occurring in the composition as much as possible. Further, even though it is a high-concentration product as described above, it is prepared so that it does not thicken or gel, and is a stable liquid having a constant viscosity or less, so it is very easy to handle and can be easily diluted uniformly. it can.

The high-concentration liquid neutral detergent composition of the present invention, when used, can be diluted with water to an arbitrary ratio, has the expected detergency, and at the same time, has a skin irritation property such as rough skin. It is suppressed as much as possible.

Moreover, the high-concentration liquid neutral detergent composition of the present invention is of course advantageous because it achieves a more compact size in the conventional packaging with a packaging material such as a plastic container, and a new paper pack container. Not only can low-pollution containers such as the above be used, but since the composition does not contain water, it becomes possible to form a packaging form using a water-soluble polymer film as a material. Since it dissolves, it has advantages such as no generation of waste.

Next, examples will be described together with comparative examples.

[0030]

Examples 1 to 10 and Comparative Examples 1 to 7 High-concentration liquid neutral detergent compositions having compositions (weight basis, the same applies hereinafter) shown in Tables 1 to 3 below were produced.

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

With respect to each of the obtained compositions, the undiluted solution viscosity (20 ° C., 25 ° C.) and the viscosity (25 ° C.) of a 15% diluted aqueous solution were measured. Further, using each composition, the state of foam when washed by the following method, the daily stability of the undiluted detergent solution, the skin irritation of the diluted washing solution, and the like were comparatively evaluated. The results are shown in Tables 4 to 6 below.

(1) Detergency test [Test method] The test was carried out in accordance with the Shell-Oronite method (dishwashing method), and the finish conditions such as how dirt came off and the degree of slime were evaluated according to the following criteria. The detergent concentration was set to 0.05% and the washing temperature was set to 40 ° C. [Judgment] ⊚: How the stains are removed and the finish is extremely good. ○: The dirt is removed and the finish is good. Δ: The way the stains are removed and the finish is not very good. X: How to remove dirt and poor finish.

(2) Foaming power test [Test method] The height (mm) of the amount of foam generated was measured visually according to JIS-K-3362, and the average value of several measurements was used. The stability of foam over time was evaluated according to the following criteria. [Judgment] A: The foam state and stability are extremely good. ◯: Foam condition and stability are good. Δ: The foam state and stability are not so good. X: Poor foam state and stability.

(3) Aging stability test [Test method] Storage test under constant temperature condition: temperature condition 0 to 5 ° C (10
The detergent solution sample was allowed to stand for a certain period by repeating (time × 1 cycle), and the degree of transparency of the detergent liquid sample and the degree of recovery (repeatability) due to the temperature history were visually observed and evaluated according to the following criteria. [Judgment] A: Excellent transparency and repeatability can be obtained for a long period of time. ○: Good transparency and repeatability can be obtained for a certain period. B: Good transparency and repeatability cannot be obtained for a certain period. X: Good transparency and repeatability cannot be obtained.

(4) Skin irritation test [Test method] According to the SKINTEX method (Fragrance Journal, 15-21p, 1992-8). That is, a sample was prepared by adjusting the concentration of the detergent liquid sample to 10% (pH 6.0 to 8.0). Then, the irritation to a physicochemical skin model (HRA) was visually observed and evaluated according to the following criteria. ○: Mild to irritation category △: Moderate to irritation category ×: Severe to irritation category

[0039]

[Table 4]

[0040]

[Table 5]

[0041]

[Table 6]

From the above results, it can be seen that all of the example products have excellent viscosity characteristics and have no problem with respect to detergency, transparency, irritation and the like. On the other hand, the comparative products all become paste-like or highly viscous at 20 ° C. and are difficult to handle.

[0043]

Examples 9 to 26 Also, different high-concentration liquid neutral detergent compositions were obtained by changing the composition as shown in Tables 7 to 11 below. Various properties of these materials were evaluated in the same manner as above, and the results are also shown in Tables 7 to 11.

[0044]

[Table 7]

[0045]

[Table 8]

[0046]

[Table 9]

[0047]

[Table 10]

[0048]

[Table 11]

[0049]

Examples 27 to 33 Furthermore, Tables 12 and 1 below.
As shown in 3, different high-concentration liquid neutral detergent compositions were obtained by changing the type of polyoxyethylene alkyl ether used as the nonionic surfactant (b). Various properties of these materials were evaluated in the same manner as above, and the results are shown in Tables 14 and 15 below.

[0050]

[Table 12]

[0051]

[Table 13]

[0052]

[Table 14]

[0053]

[Table 15]

[0054]

Examples 34 to 37 As shown in Table 16 below, different high-concentration liquid neutral detergent compositions were obtained by changing the type of solvent. Various properties of these materials were evaluated in the same manner as above, and the results are shown in Table 16 below.

[0055]

[Table 16]

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Claims (2)

[Claims] (A) Sulfonic acid having a linear alkyl group having an average carbon number of 8 to 16 and a general formula H _m N (CH ₂
CH ₂ OH) _n , (wherein, in the formula, m = 1 to 3, n = 1 to 3) and an anionic surfactant consisting of a sulfonic acid ethanolamine salt obtained with ethanolamine of 30 to 30
70 wt%, (b) the general formula _{R-O (CH 2 CH 2} O) n
H, (wherein R is a linear or branched alkyl group having an average carbon number of 8 to 16, n = 2 to 18), and a nonionic surfactant made of polyoxyethylene alkyl ether of 5 to 5 is used. 40% by weight, (c) General formula R-CON (CH ₂ C
H ₂ OH) ₂ (wherein R is an alkyl group or alkenyl group having an average carbon number of 8 to 18) and a nonionic surfactant consisting of a fatty acid alkanolamide in an amount of 10 to 50% by weight. The surfactant component containing as an essential component is blended at a concentration of 85 to 95% by weight with respect to the entire composition, and at least one solvent component selected from the group consisting of ethanol, propylene glycol and polyethylene glycol is 5 A high-concentration liquid neutral detergent composition formulated at a concentration of -15% by weight, wherein the composition does not contain water and has a composition viscosity of 1000 at 20 ° C.
A high-concentration liquid neutral detergent composition characterized by exhibiting mPa · S or less. 2. The high-concentration liquid neutral detergent composition according to claim 1, wherein an aqueous solution prepared by diluting the composition so that the surfactant component is 15% by weight has a viscosity at 25 ° C. of less than 70 mPa · S. .