JP3167616B2 - High concentration liquid neutral detergent composition - Google Patents

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 is free from water and inorganic salts in its composition, for example, for industrial dishwashing.

[0002]

2. Description of the Related Art Conventionally, commercial dishwashing detergents have been filled in metal containers called inner cans (capacity: 18 liters) whose inner surface is coated with a plastic film, and these containers are exclusively disposed of. However, disposal costs have recently risen due to the tightening of regulations on disposal, and this has forced a switch from metal containers to plastic containers.

On the other hand, regarding plastic containers,
Although it is used in a wide range of industries because of its moldability, light weight, and advantages such as purchase cost, in recent years, measures to reduce the amount of plastic used have been urgently needed due to the difficulty of decomposing plastics in the natural world. . Against this background, in the detergent industry, some measures have been taken to reduce the total amount of containers to be disposed of, such as collecting and reusing containers in their original form, but this is extremely rare. Case. A recent trend in the industry is to reduce the size and packaging of easy-to-use plastic containers as demands of 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 because it can be disposed of as ordinary municipal waste after use.

[0005] However, these measures have been effective in reducing the total amount of container disposal, although they have not achieved a certain effect, but together with these measures, measures for increasing the concentration of detergents have become concrete. I have.

One example of increasing the concentration of the detergent is to adjust the concentration to about 50 to 60% by weight by increasing the amount of the surfactant in the composition and relatively reducing the amount of water.
It is technically possible. In such a high-concentration detergent composition, technical development efforts have been made to make the appearance, viscosity and other properties of the conventional use concentration similar to those of the conventional product so as to eliminate user's uncomfortable feeling. −
JP-A-179298 and JP-A-5-320798 disclose a high-concentration neutral detergent composition.

[0007]

As described above, several attempts have been made to increase the concentration of a detergent, but a high concentration product which can be expected to have a sufficient effect has not been obtained. Not at the stage.

[0008] Moreover, conventionally known high concentration products are:
Each of them is a water-containing composition, and there are some problems in a system containing these waters. That is, as long as the system contains water, the higher the concentration of the detergent component, the more suddenly the viscosity increases or the more difficult it is to prepare a solution such as gelation.

For example, most commercially available liquid neutral detergents have a surfactant concentration of 13 to 13 as an active ingredient.
It is set to 20% by weight. Others are composed of water and some inorganic salts, and the viscosity of such a detergent is 250 on average in relation to the type of activator to be blended.
Generally, it is adjusted to a relatively viscous liquid of up to 600 mPa · S. In addition, the viscosity is 1000 to 1400
Although there are some which are high as mPa · S, there is a problem that when the high-concentration liquid detergent is measured and diluted in general, the high-viscosity makes the above-mentioned constant measurement very troublesome. I have.

[0010] In addition, the above-mentioned high-viscosity detergent containing water does not contribute to the original detergency in the preparation of a solution, that is, it is necessary to add a drug other than the active ingredient.
It is necessary to prove the safety of the effects of these drugs remaining on tableware and skin, which raises a new problem of guaranteeing the quality stability of detergents.

Further, in the conventional high-concentration liquid neutral detergent containing water, there is a problem that spoilage bacteria are caused by water.

The present invention has been made in view of such circumstances, and a high-concentration liquid containing a high-concentration surfactant component, containing no water in the composition, and prepared to have a viscosity equal to or lower than a certain viscosity that is easy to handle. It is an object 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) a sulfonic acid having a linear alkyl group having an average of 8 to 16 carbon atoms and a general formula H _m N ( CH ₂ CH ₂ OH)
_n,. 30 to (wherein, m = 0 ~ 2, n = 1~3, m + n = 3) an anionic surfactant comprising a sulfonic acid ethanolamine salt obtained by the ethanol amine represented by
70% by weight, (b) a general formula RO (CH ₂ CH ₂ O) _n H, wherein
R is a linear or branched alkyl group having an average of 8 to 16 carbon atoms, n = 2 to 18) 5 to 40% by weight of a nonionic surfactant composed of a polyoxyethylene alkyl ether represented by (c) A) a nonionic surfactant comprising a fatty acid alkanolamide represented by the general formula R-CON (CH ₂ CH ₂ OH) ₂ , wherein R is an alkyl or alkenyl group having an average of 8 to 18 carbon atoms; The surfactant component containing the above three components as essential components is blended at a concentration of 85 to 95% by weight based on the whole composition, and is selected from the group consisting of ethanol, propylene glycol and polyethylene glycol. A high-concentration liquid neutral detergent composition containing at least one solvent component at a concentration of 5 to 15% by weight, wherein the composition does not contain water and has a temperature of 20 ° C. That the composition viscosity 1000mP
a · S or less is adopted.

[0014] Preferably, the surfactant component is 1
An aqueous solution obtained by diluting the composition so as to have a concentration of 5% by weight has a viscosity at 25 ° C. of less than 70 mPa · S. In other words, when the viscosity is less than 70 mPa · S, the liquid becomes almost water and is a dry liquid. Therefore, when the liquid is filled and used in a hand-operated dispenser pump, the liquid has an advantage that the liquid easily moves and the pushing operation is easily performed. . In addition, there is an advantage in that when the detergent is pumped from one detergent supply source to a plurality of use locations (for example, individual sinks in a kitchen), the transport pressure is low.
Furthermore, because the feeling at the time of use is not sticky and the foam is good,
It also has the advantage of meeting the needs of consumers against the background of safety consciousness and increasing awareness of environmental conservation.

[0015]

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 a desired detergency based on the above-mentioned applications, and is a linear alkyl group having an average of 8 to 16 carbon atoms. sulfonic acids having the general formula H _m N
(CH ₂ CH ₂ OH) _n , wherein m = 0 to 2 and n = 1
-3, m + n = 3 ), an anionic surfactant comprising a sulfonic acid ethanolamine salt obtained with ethanolamine. As the sulfonic acid, linear alkylbenzene sulfonic acid is preferable,
Examples of the ethanolamine include monoethanolamine, diethanolamine, and triethanolamine. The sulfonic acid ethanolamine salt may be used alone or in combination of two or more.

The mixing ratio of the anionic surfactant (a) must be set to 30 to 70% by weight (hereinafter abbreviated as "%"). That is, when the concentration exceeds 70%, the cleaning property of the cleaning liquid obtained by diluting the highly concentrated liquid in water is not affected, but the target composition viscosity (2
0 ° C.) greatly exceeds 1000 mPa · S,
This is because adjustment becomes difficult, and handling during dilution is hindered. Conversely, if it is less than 30%, the expected cleanability cannot be obtained when used for the purpose intended by the present application.
In addition, it is preferable to set to 50 to 70% among the above mixing ratios.

Further, the nonionic surfactant (b) used in the present invention significantly reduces the detergency when a highly concentrated liquid obtained by blending the same and the liquid is used after being diluted with water in a certain amount. The compound is prepared so that the solution viscosity is in a low range without being treated, and is blended to make it easy to handle. In the formula, R—O (CH ₂ CH ₂ O) _n H, wherein R is the average carbon number 8 to 16 linear or branched alkyl groups, n =
Polyoxyethylene alkyl ethers represented by 2 to 18) are used. It is particularly preferable to use the ethylene oxide having an addition number of 3 to 12 mol.

The mixing ratio of the nonionic surfactant (b) must be set to 5 to 40%. That is,
If it exceeds 40%, it becomes difficult to maintain a certain level of detergency, whereas if it is less than 5%, it is difficult to obtain the effect of adjusting the viscosity. In addition, it is preferable to set to 10 to 25% among the above mixing ratios.

Further, the nonionic surfactant (c) used in the present invention is blended for improving the detergency and emulsifying power for oil and fat stains, but is also very effective in adjusting the viscosity. It is. It is also known that the effect of relaxing skin irritation to give a mild feeling (Japanese Patent Application Laid-Open No. 53-96007). It is also effective in performing bubble removal and fine-grained bubble control. The nonionic surfactant (c) has a general formula of R-CO
N (CH ₂ CH ₂ OH) ₂ , wherein R is an average carbon number of 8
To 18 alkyl groups or alkenyl groups).

The mixing ratio of the nonionic surfactant (c) must be set to 10 to 50%. That is, if it exceeds 50%, the balance with other surfactant components is deteriorated, the detergency is reduced, and the practicality is poor.
Conversely, if the content is less than 10%, the resulting cleaning agent becomes remarkably irritating to the skin, and foaming becomes poor. In addition, among the above blending ratios, 10 to 25%
It is preferable to set to.

The high-concentration liquid neutral detergent composition of the present invention comprises:
The above three surfactant components are contained as essential components, and together with these, other known surfactant components and the like can be appropriately compounded. However, the above 3
The concentration of the entire surfactant component, including the type of surfactant component, in the composition must be set at 85-95%. That is, if it exceeds 95%, the viscosity becomes too high and the desired viscosity characteristics cannot be obtained. Conversely, if it is less than 85%, the effect accompanying the concentration of the detergent, such as the compactness of the container, 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, or polyethylene glycol alone or in combination of two or more. is there. These solvent components are components necessary for maintaining 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 in balance with the concentration range of the surfactant component. Among these solvents, it is particularly preferable to use a mixed solvent obtained by mixing ethanol and propylene glycol at a ratio of 2: 1.

[0024] The high-concentration liquid neutral detergent composition of the present invention thus obtained has a high concentration of a surfactant component of 85% or more. The burden associated with disposal can be reduced. Moreover, since it does not contain water at all, it has excellent storage stability. Also, despite its 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 can be achieved.

Further, among the high-concentration liquid neutral detergent compositions of the present invention, in particular, 50 anionic surfactants (a) are used.
A composition comprising 10 to 25% of a nonionic surfactant (b) composed of polyoxyethylene alkyl ether and 10 to 25% of a fatty acid alkanolamide (c) is diluted with the composition by 15%. Of aqueous solution obtained by
The viscosity at 5 ° C. is less than 70 mPa · S, and the viscosity is significantly reduced. Therefore, when used, there is no sticky feeling, and an exhilarating feeling of use and excellent foam removal are exhibited. Conventionally, such low-viscosity type detergents have been considered to be undesirable because they lead to excessive use of the detergents. Is a favorable characteristic in meeting such new needs. In addition, since the liquid becomes almost liquid, it is advantageous in that the liquid is easily moved and the pushing operation is easily performed when the dispenser pump is filled and used. In addition, there is an advantage that the transport pressure is low when the detergent is pumped from one detergent supply source to a plurality of use locations (for example, individual sinks in a kitchen).

[0026]

As described above, the high-concentration liquid neutral detergent composition of the present invention has a surfactant component concentration of 85% in detergents used for washing dishes and cooking utensils and for washing vegetables and fruits. Since it is a high-concentration product of about 95% and does not contain water in the composition, generation of spoilage bacteria caused by water in the composition can be prevented as much as possible. In addition, despite being a high-concentration product, it is not thickened or gelled, and is prepared to be a stable liquid having a certain viscosity or less. it can.

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

Moreover, the high-concentration liquid neutral detergent composition of the present invention is advantageous not only for achieving compactness in packaging with conventional packaging materials such as plastic containers, but also for newly adding paper pack containers. Not only is it possible to use low-pollution containers, etc., but also because it does not contain water in its composition, it becomes possible to make a packaging form using a water-soluble polymer film as a material. Since it is dissolved, there is an advantage that no waste is generated.

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 the compositions shown in the following Tables 1 to 3 (weight basis, the same applies hereinafter) were produced.

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

Then, for each of the obtained compositions, the viscosity of the stock solution (20 ° C., 25 ° C.) and the viscosity of the 15% diluted aqueous solution (25 ° C.) were measured. Further, using each composition, the state of foam when washed by the following method, the daily stability of the stock solution of the detergent, the skin irritation of the diluted washing solution, and the like were compared and 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 (dish washing method), and the finished condition such as how to remove dirt and the degree of nulling was evaluated according to the following criteria. The detergent concentration was set to 0.05%, and the washing temperature was set to 40 ° C. [Judgment] ：: Very good stain removal and finish. ：: Stain removal and finish are good. Δ: Dirt removal and finish are not very good. ×: Poor stains and poor finish.

(2) Foaming force test [Test method] Performed in accordance with JIS-K-3362, and measured the height (mm) of the amount of generated foam by visual observation. The temporal stability of the foam was evaluated according to the following criteria. [Judgment] ：: Very good foam state and stability. ：: Foam state and stability are good. Δ: The state and stability of the foam are not so good. ×: Poor foam state and stability.

(3) Daily stability test [Test method] Storage test under constant temperature conditions: temperature condition 0-5 ° C (10
(Time x 1 cycle), and the sample was allowed to stand for a certain period of time. The transparency of the detergent liquid sample and the degree of recovery (repetition) due to its temperature history were visually observed and evaluated according to the following criteria. [Judgment] A: Very good transparency and repeatability are obtained over a long period of time. ：: Good transparency and repeatability are obtained for a certain period. Δ: Good transparency and repeatability were not obtained for a certain period. X: Good transparency and repeatability cannot be obtained.

(4) Skin irritation test [Test method] The test was performed 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 irritancy to the physicochemical skin model (HRA) was visually observed and evaluated according to the following criteria. ○: Mild irritant category △: Moderate irritant category ×: Severe category severe

[0039]

[Table 4]

[0040]

[Table 5]

[0041]

[Table 6]

From the above results, it can be seen that all of the products of the examples have excellent viscosity characteristics and have no problem in detergency, transparency, irritation and the like. On the other hand, all of the comparative examples became paste-like or nearly viscous at 20 ° C., indicating that it was difficult to handle.

[0043]

Examples 9 to 26 Further, different high-concentration liquid neutral detergent compositions were obtained by changing the compositions as shown in Tables 7 to 11 below. These were also evaluated for various properties in the same manner as described above, and the results are 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 Further, the following Tables 12 and 1
As shown in FIG. 3, different high-concentration liquid neutral detergent compositions were obtained by changing the type of polyoxyethylene alkyl ether used as the nonionic surfactant (b). These were also evaluated for various properties in the same manner as described 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 the solvent. These were also evaluated for various properties in the same manner as described above, and the results are shown in Table 16 below.

[0055]

[Table 16]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI C11D 10/02 C11D 10/02 (56) References JP-A-4-11698 (JP, A) JP-A-7-316589 (JP) JP-A-8-3587 (JP, A) JP-A-7-310099 (JP, A) JP-A-6-240292 (JP, A) JP-A-5-320698 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C11D 1/00-17/08

Claims (2)

(57) [Claims] 1. A (a) sulfonic acids having straight-chain alkyl group having an average 8 to 16 carbon atoms and the general formula H _m N (CH ₂
CH ₂ OH) _n, (where, m = 0 ~ 2, n = 1~3, m
+ N = 3) in an anionic surfactant comprising a sulfonic acid ethanolamine salt obtained by the ethanol amine represented 30-70 wt%, (b) the general formula _{R-O (CH 2 CH 2} O) n H , (Where
R is a linear or branched alkyl group having an average of 8 to 16 carbon atoms, n = 2 to 18) 5 to 40% by weight of a nonionic surfactant composed of a polyoxyethylene alkyl ether represented by (c) A) a nonionic surfactant comprising a fatty acid alkanolamide represented by the general formula R-CON (CH ₂ CH ₂ OH) ₂ , wherein R is an alkyl or alkenyl group having an average of 8 to 18 carbon atoms; The surfactant component containing the above three components as essential components is blended at a concentration of 85 to 95% by weight based on the whole composition, and is selected from the group consisting of ethanol, propylene glycol and polyethylene glycol. A high-concentration liquid neutral detergent composition containing at least one solvent component at a concentration of 5 to 15% by weight, wherein the composition does not contain water and has a temperature of 20 ° C. That the composition viscosity 1000mP
A high-concentration liquid neutral detergent composition characterized by exhibiting a · S or less. 2. The high-concentration liquid neutral detergent composition according to claim 1, wherein the viscosity at 25 ° C. of the aqueous solution obtained by diluting the composition so that the surfactant component becomes 15% by weight is less than 70 mPa · S. .