JPH06346100A - Production of solid detergent - Google Patents

Abstract

PURPOSE:To simply obtain a solid detergent remarkably reduced in its swelling and dissolution collapse when used, by a specific method using a fatty acid (ester), an alkali metal salt and an anionic synthetic surfactant as raw materials. CONSTITUTION:The characteristic of this method for producing a solid detergent by neutralizing a fatty acid with an alkali metal salt or saponifying a fatty acid ester with an alkali metal salt comprises simultaneously adding an alkali metal salt solution having a water content of >=50% and an anionic synthetic surfactant (e.g. sodium monoglyceride sulfate) or an amphoteric surfactant (e.g. an alkyl betaine) to obtain the objective detergent containing the fatty acid alkali metal salt in an amount of >=30%. Concretely, e.g. a fatty acid (ester) is charged in a kneader and subsequently mixed with the alkali metal salt aqueous solution and the surfactant simultaneously to neutralize or saponify the fatty acid (ester). The alkali metal salt is preferably Na salt or K salt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a solid detergent, and more particularly, it relates to a method for producing a solid detergent for preventing dripping and collapse during use.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As the solid detergent, soap (alkaline salt of higher fatty acid), combination bar in which soap contains a synthetic surfactant, syndet bar in which a synthetic surfactant is hardened with an additive (binder), and the like are practically used.

Of these, for example, a combination bar is usually a "base chip" (a higher fatty acid or an alkali metal salt of its ester and a water content) in which the amount of water is adjusted by neutralizing (saponifying) a fatty acid (ester) and then drying. It can be obtained by sufficiently stirring and mixing the solid composition) and the synthetic surfactant with a stirrer such as a kneader.

However, the combination bar obtained by the above-mentioned manufacturing method is liable to suffer from fussing and melt-down during use, which has been a serious problem.

As measures against this, sodium chloride (US Pat. No. 2,356,903) and a combination of sodium chloride and sodium sulfate (US Pat. No. 2,744,874) have been used so far.
), Isethionic acid sodium salt (US Pat. No. 3,376,376)
No. 229) has been studied, but any of the methods requires a large amount of addition in order to exert a sufficient effect. When added in a large amount, cracking, poor solubility,
It has disadvantages such as bad foaming. Further, a method of combining long-chain saturated alkyl sulfate and paraffin wax in combination (WO9216)
No. 610) and a method of blending nonionic guar gum (Japanese Patent Laid-Open No. 63-170498), but these are also used depending on the effect of the basic bar composition or by adding them. Feeling gets worse. On the other hand, the solid properties of the solid detergent, such as spillage and meltdown, depend on various conditions during production, the order of addition of components other than soap, the presence or absence of pulverization with a three-stage roll after addition of various components, and the time of plunger extrusion. Although it changes depending on the outlet temperature and the like, no conditions have been found yet that a sufficient effect can be obtained even if these are variously changed.

Therefore, in the production of the combination bar, it has been desired to develop a production method capable of preventing the melting and collapse during use.

[0007]

Means for Solving the Problems As a result of intensive studies in view of such circumstances, the present inventors have found that when neutralizing fatty acids or saponifying fatty acid esters, an alkali metal salt solution and an anionic synthetic interface are used at the time of neutralization of fatty acids or saponification of fatty acid esters. By adding the surfactant or amphoteric surfactant almost at the same time or mixing the fatty acid alkali metal salt with the anionic synthetic surfactant or amphoteric surfactant and stirring them homogeneously, there is no swelling or dissolution collapse during use. Finding that a cleaning agent can be obtained,
The present invention has been completed.

That is, the present invention is, firstly, a solid obtained by neutralizing a fatty acid with an alkali metal salt or saponifying a fatty acid ester with an alkali metal salt, and further mixing an anionic synthetic surfactant or an amphoteric surfactant. In the method for producing a detergent, a solution of an alkali metal salt having a water content of 50% or more and an anionic synthetic surfactant or an amphoteric surfactant are added almost at the same time, and a fatty acid alkali metal salt is contained in an amount of 30% or more. The present invention provides a method for producing a solid detergent.

Secondly, the present invention is a solid detergent for neutralizing a fatty acid with an alkali metal salt or saponifying a fatty acid ester with an alkali metal salt, and further mixing an anionic synthetic surfactant or an amphoteric surfactant. In the method for producing a solid detergent, a mixture of a fatty acid alkali metal salt and an anionic synthetic surfactant or an amphoteric surfactant is provided with a water content and a temperature that enable homogeneous stirring. Is provided.

The fatty acids used in the present invention include those normally used in soaps such as lauric acid, myristic acid,
Examples include palmitic acid and stearic acid. As the fatty acid ester, various esterified products of these fatty acids can be used. These may contain a small amount of impurities, such as glycerin, monoglyceride, diglyceride, triglyceride, etc., as in ordinary soap production.

The alkali metal salt used in the present invention is preferably a sodium salt or a potassium salt, and these are compounds capable of reacting with a fatty acid to be neutralized, for example, a so-called caustic aqueous solution of sodium hydroxide, potassium hydroxide or the like. Preference is given to using.

The anionic synthetic surfactant used in the present invention is preferably one which is water-soluble under the conditions of 200 ° C. or lower and does not decompose under alkaline conditions of 50 ° C. or higher. May be used. The shape may be solid, powder, liquid, or aqueous solution, but solid or powder is preferable from the viewpoint of preventing smoldering and dissolution collapse. Specific examples include sodium monoglyceride sulfate, α-sulfofatty acid ester, isethionate ester, alkylaryl sulfonic acid, alcohol sulfate ester, sulfate ester of alcohol ethoxylate, olefin sulfonic acid, paraffin sulfonic acid, alcohol phosphate ester, N- Acyl glutamic acid, the following general formula (1) RCONH (CH ₂ ) _n COOH (1) (In the formula, RCO represents an acyl group having 10 to 16 carbon atoms,
n represents 1 or 2), an alkali metal salt such as an N-acyl compound represented by, or an alkanolamine salt,
Examples include salts such as ammonium salts. The amphoteric surfactant is not particularly limited, and examples thereof include alkylbetaine (carbobetaine), alkylamidobetaine, alkylsulfobetaine, alkylhydroxysulfobetaine, and the like. Here, the alkyl group is preferably a lauryl group or a myristyl group. These may be used alone or in combination of two or more. The anionic surfactant and the amphoteric surfactant can be used in combination.

In the first production method of the present invention, for example, a kneader is first charged with a fatty acid or a fatty acid ester, and an aqueous solution of an alkali metal salt having a water content of 50% by weight (hereinafter simply referred to as "%") is added thereto. Anionic synthetic surfactant or amphoteric surfactant is added at about the same time. Either may be added first. Here, “substantially simultaneously” means that the alkali metal salt aqueous solution and the anionic surfactant or amphoteric surfactant are sequentially added. It goes without saying that they may be added “simultaneously”.

The blending weight ratio of the fatty acid alkali metal salt obtained by the above neutralization or saponification reaction to the anionic synthetic surfactant or amphoteric surfactant is 3: 7 to such that the fatty acid alkali metal salt is contained in an amount of 30% or more. It is preferably 7: 3.

In the above neutralization or saponification reaction, the water content of the whole reaction system is preferably 20% or more in order to uniformly stir the whole.

The mixture obtained through the above steps can be subjected to a normal soap production step described below as a so-called soap base to obtain a solid detergent.

In the second production method of the present invention, it is possible to mix the fatty acid alkali metal salt obtained by the neutralization or saponification reaction with the anionic synthetic surfactant or amphoteric surfactant by homogeneous stirring. Moisture content and temperature are applied to the system. At this time, the addition of the anionic synthetic surfactant or the amphoteric surfactant into the system may be carried out according to the above-mentioned first production method, or after a neutralization or saponification reaction according to a conventional method.

The water content of the entire system is preferably 20% or more, particularly preferably 30% or more, while the temperature is preferably 50 ° C. or more, particularly preferably 70 to 150 ° C. However, the temperature needs to be lower than the decomposition temperature of the material to be mixed. Further, the amount of water is not limited as long as a drying step is provided after mixing, and no matter how large the amount is, it does not affect the effect of the present invention, that is, the suppression of melting and dissolution collapse.

The mixture thus obtained can be used as a soap base in the same manner as described above and then subjected to the usual production process to obtain a solid detergent.

The saponification reaction is described in JP-A-4-117.
As described in Japanese Patent Publication No. 497, palm oil or the like is transesterified with a lower alcohol to separate glycerin from the product to obtain a fatty acid ester, which is then hydrogenated to obtain a hydrotreated product. It is also possible to mix the product with a part or all of the remaining fatty acid ester and saponify it with an alkali metal, or to separately saponify both and then mix them.

In the present invention, sodium sulfate, sodium diglyceride sulfate or sodium monoglyceride disulfate, which is a by-product of sodium monoglyceride sulfate, is contained in the mixing step of the fatty acid alkali metal salt and the anionic synthetic surfactant. Good.

In the present invention, the respective mixtures obtained by the above-mentioned method can be used as they are to obtain a solid detergent in a usual production process. That is, the above mixture is put in a kneader, and if necessary, fatty acid or higher fatty acid ester as a superfat, petrolatum, silicone, fluorine-containing compound, magnesium stearate, a feel and foam improving agent such as polyethylene oxide, EDTA, etc. Moisturizers such as chelating agents, glycerin and propylene glycol,
Anti-skid agents such as magnesium oxide and calcium oxide,
After adding an ultraviolet absorber, an antioxidant, a bactericide, a fragrance, a pigment and the like and mixing them sufficiently, they may be further kneaded with a three-stage roll or the like, extruded and stamped.

[0023]

According to the production method of the present invention, it is possible to easily obtain a solid detergent in which the swelling and dissolution collapse during use are remarkably reduced.

[0024]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited thereto.

Example 1 A 100 l kneader was heated to around 80 ° C., and 20 kg of fatty acid (beef tallow / palm = 8/2) was added. 7.2 kg of 48% sodium hydroxide aqueous solution was gradually added thereto while stirring. Immediately thereafter, 12 kg of a 31% aqueous solution of laurylamidopropyl betaine and 10 kg of sodium monoglyceride sulfate composition (90% purity) were added, and the mixture was stirred for 10 minutes while maintaining the temperature at around 80 ° C. Then, the mixture was formed into a ribbon with a chilling roll and dried to a moisture content of 12% with a warm air dryer to obtain a base chip. Transfer the base chips to a kneader and add pigment (0.5% by weight) and fragrance (1
%) And added and stirred for 5 minutes at room temperature. This mixture was processed with a three-stage roll, then extruded with a prodder to form a bar, and punched into a usual commercial soap-like shape with a stamping machine.

Example 2 A 100 l kneader was heated to 50 ° C. and soap chips (beef tallow / palm = 8/2 composition, water content 12%, sodium salt)
25.5kg and laurylamidopropyl betaine (95%
Purity) 4kg Palm composition Monoglyceride sodium sulfate 1
Add 0 kg (90% purity) and 12 kg of water, and add 6 from 50 ℃
The mixture was stirred at 0 ° C for 30 minutes. Then, the mixture was formed into a ribbon with a chilling roll and dried to a moisture content of 12% with a warm air dryer to obtain a base chip. Transfer the base chips to a kneader and add pigment (0.5% by weight) and fragrance (1
(Wt%) was added and stirred at room temperature for 5 minutes. This mixture was treated with a three-stage roll, and then extruded with a plodder to form a bar shape, which was then stamped into a usual commercial soap-like shape with a stamping machine.

Comparative Example 1 For comparison with the sample of Example 1, a sample was prepared by the following general manufacturing method so that the final composition was the same as that of Example 1. Soap chips (beef tallow / palm = 8 /
(2, water content 12%) was put in a kneader, and sodium monoglyceride sulfate and laurylamidopropyl betaine (powder) were added to the kneader and stirred at room temperature for 10 minutes. Then, a fragrance and a pigment were further added to the mixture, and the same operation as in Example 1 was performed to obtain a sample having a commercially available soap-like shape.

Comparative Example 2 Before adding the fragrance and the pigment in Comparative Example 1, 5% by weight of sodium chloride was added, and then the same operation as in Comparative Example 1 was performed to obtain a sample.

Comparative Example 3 5% by weight of sodium chloride and 5% by weight of sodium sulfate were added before adding the fragrance and the pigment in Comparative Example 1, and then the same operation as in Comparative Example 1 was performed to obtain a sample.

Comparative Example 4 Before adding the fragrance and the pigment in Comparative Example 1, 5% by weight of sodium isethionate was added, and then the same operation as in Comparative Example 1 was performed to obtain a sample.

Test Example (Measurement of Softness) A sample placed in a commercially available soap box made of plastic (having a hole in the bottom) was placed on the bottom of a container having an appropriate size. Then, tap water at 25 ° C. was poured so that half of the sample was immersed therein, and left for 1 hour. After that, the sample was taken out and left for 24 hours in a desiccator containing water at the bottom. After that, a fuzzyness test was performed. Fuzzyness test method: A plunger having a disc with a diameter of 10 mm attached to the tip was placed on the sample, and the penetration distance (mm) of the plunger into the sample when a load of 1 kg was applied to the plunger was compared. The smaller the degree of fluffiness is, the lesser the fluffiness is. The results are shown in Table 1.

[0032]

[Table 1]

As is clear from the results shown in Table 1, it can be seen that the solid detergent according to the present invention remarkably reduces frostiness during use.

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[Procedure amendment]

[Submission date] September 2, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Of these, for example, a combination bar is usually a "base chip" (a higher fatty acid neutralized with an alkali metal salt) in which the amount of water is adjusted by neutralizing (saponifying) a fatty acid (ester) and then drying it. Alternatively, it can be obtained by thoroughly stirring and mixing an ester obtained by saponifying an ester thereof with an alkali metal salt, a solid composition containing only water, and a synthetic surfactant with a stirrer such as a kneader.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

As measures against this, sodium chloride (US Pat. No. 2,356,903) and a combination of sodium chloride and sodium sulfate (US Pat. No. 2,744,874) have been used so far.
), Isethionic acid sodium salt (US Pat. No. 3,376,376)
No. 229) has been studied, but any of the methods requires a large amount of addition in order to exert a sufficient effect. When added in a large amount, cracking, poor solubility,
It has disadvantages such as bad foaming. Also, a method of combining long-chain saturated alkyl sulfate and paraffin wax in combination (WO9216)
No. 610) and a method of blending nonionic guar gum (Japanese Patent Laid-Open No. 63-170498), but these are also used depending on the effect of the basic bar composition or by adding them. Feeling gets worse. On the other hand, the solid properties of the solid detergent, such as spillage and meltdown, depend on various conditions during production, the order of addition of components other than soap, the presence or absence of pulverization with a three-stage roll after addition of various components, and the time of plunger extrusion. Although it changes depending on the outlet temperature and the like, no conditions have been found yet that a sufficient effect can be obtained even if these are variously changed.

Claims (3)

[Claims] 1. A method for neutralizing a fatty acid with an alkali metal salt or saponifying a fatty acid ester with an alkali metal salt,
Further, in the method for producing a solid detergent in which an anionic synthetic surfactant or an amphoteric surfactant is mixed, the water content is 50%.
A method for producing a solid detergent, which comprises adding the above-mentioned alkali metal salt solution and an anionic synthetic surfactant or an amphoteric surfactant at substantially the same time so as to contain a fatty acid alkali metal salt in an amount of 30% or more. 2. A fatty acid is neutralized with an alkali metal salt or a fatty acid ester is saponified with an alkali metal salt,
Furthermore, in the method for producing a solid detergent in which an anionic synthetic surfactant or an amphoteric surfactant is mixed, a water content that enables homogeneous stirring in a mixture of a fatty acid alkali metal salt and an anionic synthetic surfactant or an amphoteric surfactant. A method for producing a solid detergent, which comprises applying an amount and a temperature. 3. The water content of the mixture is 20% by weight or more, and the temperature in the stirring tank is 50 ° C. or more.
A method for producing the described solid detergent.