JPH06346099A - Highly concentrated alkali liquid cleanser composition and its production - Google Patents

Abstract

PURPOSE:To obtain the subject composition high in the concentration of an alkali agent and suitable for automatic dish washers, etc., by adding a phosphonobutane tricarboxylic acid salt to an alkali liquid cleanser containing the alkali agent by a specific method. CONSTITUTION:The components of this composition are compounded with each other in a mixing pot so as to give (A) 20-60wt.% of an alkali agent (e.g. KOH, potassium pyrophosphate) and (B) 0.1-10wt.% of a phosphonobutane tricarboxylic acid (salt), and subsequently heated at 60-95 deg.C' under stirring, preferably while preventing the evaporation of water as much as possible, thus providing the objective composition as a transparent liquid. The composition may further be compounded with a metal-sealing agent such as EDTA or a hexonic acid, e.g. a gluconic acid salt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly concentrated alkaline liquid detergent composition suitable for spray type and shower type automatic washing machines used for washing dishes and the like, and a method for producing the same.

[0002]

2. Description of the Related Art In a place where a large amount of meal is provided such as a hotel, a restaurant, a catering company, a hospital and a cafeteria of a company, an automatic washer of a spray type and a shower type is used to wash dishes after use. There is.

In these spray-type and shower-type automatic washing machines, a surfactant is not blended in order to avoid foaming, and various stains such as oil and fat, starch and protein are attached to tableware. Therefore, an alkaline cleaner is used to deal with this.

The shape of these alkaline cleaners includes powder, solid and liquid. Normally, in an automatic cleaning machine, when the usage concentration of the cleaning agent decreases, the sensor detects the concentration decrease and automatically detects the cleaning agent. In this case, the liquid form is the best for supplying the detergent component as a uniform composition.

Alkali liquid detergents for automatic washing machines include potassium tripolyphosphate, sodium and potassium silicate, potassium hydroxide, hypochlorous acid alkali salt (Japanese Patent Publication No. 2-29720), alkaline liquids. A detergent composition containing one or more polyols (Japanese Patent Publication No. 62-25184).
No.) is known.

[0006]

However, in these conventional alkaline liquid detergents, the concentration of alkali is at best
It has the drawback that it can only be increased to around 30% by weight.

Further, if the alkali concentration is further increased, the stability at low temperature becomes poor, and even if it is left at room temperature, precipitation or the like occurs and a uniform liquid cannot be obtained.

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have increased the alkali concentration in the composition by adding phosphonobutanetricarboxylic acid or a salt thereof to the composition of an alkaline liquid detergent. I found that

[0009]

The present invention is based on the above finding, and is based on the above finding, a high-concentration alkali prepared by mixing phosphonobutanetricarboxylic acid or a salt thereof in an alkaline liquid detergent composition containing a high-concentration alkaline agent. A liquid detergent composition and a method for producing the same are proposed.

Examples of the alkaline agent include potassium hydroxide, sodium hydroxide, potassium orthophosphate, sodium orthophosphate, potassium pyrophosphate, sodium pyrophosphate, potassium orthosilicate, sodium metasilicate, and the like. The amount is 20-60% by weight in the composition, preferably 30-50% by weight.

Phosphonobtan tricarboxylic acid has been conventionally used as a sequestering agent or is known as a scale inhibitor (Japanese Patent Publication No. 58-53034, Japanese Patent Publication No. 57-13358).
JP-A-63-258697) is a compound represented by the following structural formula.

[0012]

[Chemical 1]

The amount of phosphonobutane tricarboxylic acid and its salt is 0.1 to 10% by weight in the composition, preferably 0.5.
It is up to 8% by weight, and when it is 0.1% by weight or less, there is no effect of improving the alkali concentration, and even if it is blended in an amount of 10% by weight or more, no further remarkable effect is observed.

An alkaline liquid detergent composition comprising an alkaline agent and phosphonobutanetricarboxylic acid is, for example, 20% by weight of potassium hydroxide, 20% by weight of potassium orthophosphate, and 2.5% by weight of phosphonobutanetricarboxylic acid.
An example of the composition consisting of the balance water can be given.

In addition to the above, a hexonate and a sequestering agent can be added to the alkaline liquid detergent composition according to the present invention.

Here, examples of the hexonic acid salt include gluconate, sodium hexonic acid, sodium heptonic acid, and the like, which function as a cleaning component, and the compounding amount thereof is 5 to 30% by weight in the composition. , Preferably 15 to 30% by weight.

NTA, EDT as the sequestering agent
A chelating agent such as A can be mentioned, and the compounding amount thereof is 5 to 20% by weight, preferably 10 to 15% by weight in the composition.

As a method for producing an alkaline liquid detergent according to the present invention, a predetermined amount of the above components is mixed in a mixing pot and heated to 65 to 90 ° C. with stirring while preventing evaporation of water to a transparent liquid. And

This makes it possible to obtain a highly concentrated alkaline liquid detergent which does not cause precipitation, turbidity or precipitation even when the temperature is lowered to -15 ° C. When the heating temperature is 65 ° C. or lower, it solidifies at room temperature to cause turbidity.

[0020]

EXAMPLES Examples of the present invention will be shown below. Examples 1 to 4 and Comparative Examples 1 and 2 Mixing predetermined amounts of the components shown in Table 1 in a mixing pot, heating to a predetermined temperature with stirring to give a transparent liquid, and filtering with a 200 mesh strainer to wash with an alkaline liquid. I got an agent.

Table 1 shows the solid contents other than water and the stability of the obtained alkaline liquid detergent at -15 ° C to 20 ° C.

[0022]

[Table 1]

Examples 5 to 19 and Comparative Examples 3 to 8 Alkaline liquid detergents were produced in the same manner as in the above examples for the predetermined amounts of the components shown in Table 2, and the solid contents other than water, -15 ° C to Stability at 20 ° C was measured.
The results are shown in Table 2 below.

[0024]

[Table 2]

[0025]

In summary, according to the present invention, by adding phosphonobutane tricarboxylic acid or a salt thereof to an alkaline liquid detergent composition, it is possible to increase the alkali concentration in the composition and to improve the dishes. , Containers,
It is possible to provide a highly concentrated alkaline liquid cleaning agent suitable for an automatic cleaning machine used for cleaning bottles and the like.

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Claims (3)

[Claims] 1. A high-concentration alkaline liquid cleaning composition containing 0.1 to 10% by weight of phosphonobutane tricarboxylic acid or a salt thereof in an alkaline liquid cleaning composition containing 20 to 60% by weight of an alkaline agent. Agent composition. 2. The composition contains 5 to 30% by weight of hexonic acid salt.
The high-concentration alkaline liquid detergent composition according to claim 1, further comprising 5 to 20% by weight of a sequestering agent. 3. When a composition containing 20 to 60% by weight of an alkaline agent and 0.1 to 10% by weight of phosphonobutanetricarboxylic acid or a salt thereof is prepared, predetermined amounts of the composition components are sequentially added to a mixing pot, A method for producing a high-concentration alkaline liquid detergent composition, which comprises heating to 65 to 95 ° C with stirring to form a transparent liquid.