JP4578144B2 - Method for producing soap composition - Google Patents

Description

  The present invention relates to a method for producing a soap composition.

  The solid soap is produced by preparing a molten soap composed of fatty acid soap, polyols, inorganic salt, synthetic activator and the like and then cooling and solidifying it. As the polyols, glycerin, sorbitol, propylene glycol and the like are used, and as the inorganic salts, sodium chloride and the like are used. In addition, fatty acid soaps are those produced by saponifying fats and neutralizing fatty acids in the form of chips, or produced by saponifying fats and fatty acids in the process of neat soap preparation. Is used as is.

  In the process of preparing the molten soap, depending on the type and amount of each component present when neutralizing the fatty acid, aggregates may be generated in the reaction system or the reaction system may turn yellow. These agglomerates and yellowing cause the quality of the resulting soap bar to deteriorate. Patent Document 1 discloses a method of saponifying a fatty acid by adding a caustic solution to the fatty acid, a water-soluble organic solvent, water and a synthetic surfactant. It is described that this reduces the viscosity and is effective in the saponification rate. Moreover, the solid of a non-reducing sugar component is 1 to 10 parts. However, the production method in the case where the amount of soap exceeds 35 parts has not been studied at all because a transparent solid material cannot be produced. That is, the neutralization reaction is carried out in a region where the amount of soap does not exceed 35 parts and solids are 10 parts or less and aggregation does not occur. Furthermore, since the salt and salt hydrate which are solid components are added without dissolving in water, there is a possibility that quality problems such as roughening may occur when the obtained soap is used.

  Patent Document 2 describes a method of saponification by continuously introducing a fatty acid and a caustic solution into a mixing tank while maintaining a constant ratio. According to the examples, the amount of soap is 35 to 40 parts, but since it contains almost no solid component, the viscosity during the neutralization reaction does not increase. This is supported by the fact that the stirring blade used in the mixing tank described in the diagram of Patent Document 2 uses a propeller type intended for a low-viscosity liquid.

International Publication No. 96/04361 Pamphlet US Pat. No. 4,758,370

  Accordingly, an object of the present invention is to provide a method for producing a soap composition that can eliminate the various drawbacks of the prior art described above.

The present invention
(A) 25-60 wt% fatty acid soap (B) 0.5-5 wt% monovalent inorganic salt (C) 0.5-5 wt% polyvalent inorganic salt (D) 5-40 wt% % Polyols,
A method for producing a soap composition comprising cooling and solidifying molten soap having a total of component (A) and component (D) of 30 to 75% by weight in a mold,
The fatty acid soap of component (A) is produced by neutralization of fatty acid and alkali in the process of preparing the molten soap,
A soap composition which performs the neutralization in the presence of either component (B) or (C) and component (D) and supplies component (B) and component (C) as an aqueous solution to the process of preparing molten soap The object is achieved by providing a method for manufacturing a product.

  According to the production method of the present invention, a soap composition in which generation of aggregates and yellowing is prevented can be obtained.

  Hereinafter, the present invention will be described based on preferred embodiments thereof. The molten soap used in the production method of the present invention is (A) 25-60 wt% fatty acid soap, (B) 0.5-5 wt% monovalent inorganic salt, (C) 0.5-5 wt%. % Of polyvalent inorganic salt, (D) 5 to 40% by weight of polyols, and the total of component (A) and component (D) is 30 to 75% by weight. The soap composition can be obtained by pouring molten soap containing these components into a mold and solidifying by cooling. Among the above-mentioned components, the fatty acid soap of component (A) is not used in the form of chips prepared in advance, but is produced by neutralization of fatty acid and alkali in the preparation process of molten soap as it is used.

  As the fatty acid, for example, a saturated or unsaturated fatty acid having 8 to 22 carbon atoms can be used. Specific examples include those obtained from vegetable oils and animal fats (for example, palm oil, palm kernel oil, coconut oil, castor oil, soybean oil, cottonseed oil, rapeseed oil, sunflower oil, beef tallow, lard, etc.). . Among them, a fatty acid obtained from palm kernel oil or palm oil is preferable because it has a high quick foam property and the foam quality becomes creamy.

  Among the fatty acid soaps of component (A) obtained by neutralizing fatty acids, at least 80% by weight is preferably an alkali metal salt of a saturated fatty acid, particularly a sodium salt, because the resulting soap has high hardness. In addition, it is preferable that at least 10% by weight of the fatty acid soap of component (A) is an unsaturated fatty acid soap because it has a fast foaming property and foam quality becomes creamy. Furthermore, it is preferable that at least 25% by weight of the fatty acid soap of component (A) is lauric acid soap because the amount of foam is more excellent. In addition, the component (A) preferably has an insoluble content of 20% by weight or less, particularly 15% by weight or less from the viewpoint of quick foaming properties and foam amount. Here, the insoluble matter means a fatty acid soap whose solubility in water is lower than that of sodium myristate.

  The content of the fatty acid soap is 25 to 60% by weight as described above, preferably 35 to 55% by weight, and more preferably 38 to 53% by weight. If it is less than 25% by weight, the soap cannot be provided with sufficient hardness, and foaming properties are also lowered. When the amount is more than 60% by weight, agglomeration occurs or the fluid does not flow in the neutralization step during the preparation of the molten soap. Moreover, the obtained soap becomes uneven.

  As the monovalent inorganic salt of component (B), for example, alkali metal salts of monovalent anions such as alkali metal salts of halides and alkali metal salts of monovalent inorganic acids are used. Specific examples include sodium chloride, potassium chloride, sodium nitrate and the like. These can be used alone or in combination of two or more. Since the monovalent inorganic salt is present in the soap solid, it is possible to keep the hardness of the soap high, and it is possible to contain a large amount of liquid components in the soap solid. Further, by using a monovalent inorganic salt as an aqueous solution in the preparation process of the molten soap, the fluidity of the molten soap can be increased and can be controlled to an arbitrary state. Furthermore, it becomes possible to contain many solid components. Of the monovalent inorganic salt, sodium chloride is preferably used from the viewpoint that the hardness and foaming property of the soap can be increased with a small amount and the fluidity of the molten soap can be improved.

The monovalent inorganic salt of component (B) is used as an aqueous solution. When not used as an aqueous solution, a time for dissolving the monovalent inorganic salt in the system is required, and the productivity may be lowered, or the resulting soap may remain as an aggregate. The concentration of the aqueous solution can be arbitrarily set according to the moisture in the soap composition.

  As described above, the content of the monovalent inorganic salt in the molten soap is 0.5 to 5% by weight, preferably 0.5 to 4% by weight. If the amount is less than 0.5% by weight, sufficient hardness cannot be obtained. If the amount exceeds 5% by weight, the soap is separated, the viscosity of the soap becomes high, the productivity is deteriorated, or the soap surface is stored for a long time. Since crystals precipitate on the surface, it is not preferable in appearance. Moreover, foamability will also deteriorate.

Examples of the polyvalent inorganic salt of component (C) include alkali metal salts of polyvalent anions such as sulfate ion, carbonate ion, phosphate ion, pyrophosphate ion, and the like. Specific examples include sodium sulfate, sodium carbonate, magnesium carbonate, sodium muphosphate, disodium hydrogen phosphate, and the like. These can be used alone or in combination of two or more. The presence of the polyvalent inorganic salt in the soap solids makes it possible to keep the soap hardness high and to improve the fluidity of the molten soap. Of the polyvalent inorganic salts, sodium sulfate is preferably used from the viewpoint that the hardness and foamability of the soap can be improved and the fluidity of the molten soap can be improved.

  Similar to the monovalent inorganic salt, the polyvalent inorganic salt is supplied as an aqueous solution to the process of preparing the molten soap. Thereby, the fluidity of the molten soap can be increased and can be controlled to an arbitrary state. Furthermore, it becomes possible to contain many solid components. If a polyvalent inorganic salt is not used as an aqueous solution, it will take time to dissolve the polyvalent inorganic salt in the system, resulting in reduced productivity or remaining as aggregates in the resulting soap. There is. The concentration of the aqueous solution can be arbitrarily set according to the moisture in the soap composition.

  As described above, the content of the polyvalent inorganic salt in the molten soap is 0.5 to 5% by weight, preferably 0.5 to 4% by weight. If the amount is less than 0.5% by weight, sufficient hardness cannot be obtained. If the amount exceeds 5% by weight, the viscosity of the molten soap is increased and the productivity is deteriorated. It is not preferable in appearance. Moreover, foamability will also deteriorate.

  In this production method, by using a monovalent inorganic salt and a polyvalent inorganic salt in combination, the above-described effects can be further enhanced as compared with the case where each is used alone.

  It is preferable that the monovalent inorganic salt and the polyvalent inorganic salt are separately supplied to the melt soap preparation process as different aqueous solutions. If these inorganic salts are to be supplied as the same aqueous solution, there is a possibility that the required amount cannot be supplied in view of the fluidity of soap and the performance of soap. In particular, when producing a high solid content soap, the fluidity of the molten soap tends to be abnormally high.

  In this production method, the fluidity of the molten soap can be increased by using the polyol of component (D). As a result, it becomes possible to contain more fatty acid soap of component (A). Since the foaming property can be increased by increasing the content of the component (A) fatty acid soap, it is possible to reduce the amount even if no synthetic activator is used or not. Furthermore, it is possible to increase the hardness of the soap, and even when an additive is used as necessary, the soap hardness can be maintained high. It is also known that the soap hardness is increased by adding polyols.

  Furthermore, the polyol of component (D) can impart a skin care effect when using soap. Thus, it is possible not only to use an expensive synthetic activator, but also to provide a high skin care effect and to impart a refreshing finish that cannot be achieved with a synthetic activator.

  The content of polyols in the molten soap is 5 to 40% by weight as described above, and preferably 10 to 35% by weight. If it is less than 5% by weight, sufficient hardness cannot be obtained, and the hardness of the resulting soap will be low. When it exceeds 40% by weight, not only the viscosity of the molten soap is increased and the productivity is deteriorated, but also the soap is deposited on the surface of the soap when stored for a long period of time. Moreover, foamability will also deteriorate.

  The polyols can be added as an aqueous solution. In particular, when the polyol has a water-soluble solid content, it is preferably added as an aqueous solution. If it is added as a solid, it takes time to dissolve it in the system, resulting in a decrease in productivity, or agglomeration in the resulting soap and causing roughness.

  The total content of the fatty acid soap of component (A) and the polyols of component (D) in the molten soap is 30 to 75% by weight, preferably 35 to 70% by weight. If it is less than 30% by weight, the soap has a low hardness and cannot be practically used. If it is more than 75% by weight, the fluidity of the molten soap is poor and there is a problem in terms of productivity.

  Examples of the component (D) polyol include water-soluble polysaccharides such as glycerin, sorbitol, xylitol, mannitol, glucose, polyethylene glycol, and polypropylene glycol. These can be used alone or in combination of two or more. The molecular weight of polyethylene glycol or polypropylene glycol is preferably 8000 or less. Examples of the water-soluble polysaccharide include sucrose, trehalose, hydroxyethyl cellulose, hydroxypropyl cellulose and the like.

In the present invention, the neutralization condition between the fatty acid and the alkali in the process of preparing the molten soap is important. Specifically, it is necessary to neutralize the fatty acid and the alkali in the presence of either component (B) or component (C) and component (D). Moreover, it is necessary to supply a component (B) and a component (C) to the preparation process of molten soap as aqueous solution. As a result, it is possible to effectively prevent the generation of aggregates that are considered to be caused by alkali during neutralization. When neutralization is performed by directly contacting a fatty acid and an alkali, the soap produced due to the very low water content is difficult to dissolve. For this reason, agglomerates considered to be caused by alkali are generated, and the molten soap does not flow. In addition, quality problems such as roughening or non-uniformity of the obtained soap composition occur. When the component (B) and the component (C) are present at the time of neutralization, the dissolved monovalent inorganic salt and / or polyvalent inorganic salt is precipitated, and the resulting soap composition is roughened.

  In neutralization of fatty acid and alkali, the total amount of water-soluble solid components / total amount of liquid components (hereinafter referred to as solid-liquid ratio after neutralization) in the reaction system when neutralization is completed is preferably 1.5 to 4.0, more preferably 1.7 to 3.5, and still more preferably 2.0 to 3.1. When the fatty acid and the alkali are neutralized, the viscosity of the reaction system increases. As a result, the reaction system gels and the fluidity becomes poor. Therefore, the fluidity of the reaction system is made appropriate by setting the solid-liquid ratio after neutralization within the above range.

  The water-soluble solid content is a component that is solid at room temperature (25 ° C.) but dissolves in water. The fatty acid soap of component (A), monovalent inorganic salt of component (B), component (C ) And a part of the polyols of component (D). Examples of water-soluble solids belonging to the component (D) polyols include water-soluble polysaccharides such as sorbitol, xylitol, mannitol, and glucose. On the other hand, a liquid component means the water | moisture content contained in some polyols of a component (D), and molten soap. Examples of the liquid component belonging to the component (D) polyol include glycerin, liquid polyethylene glycol, and liquid polypropylene glycol.

  In the neutralization of the fatty acid and the alkali, it is preferable to neutralize the fatty acid by heating it to a molten state, while using the alkali as an aqueous solution thereof and mixing them. In this case, the aqueous alkali solution is preferably kept at the same temperature as the fatty acid. As a result, temperature drop due to alkali addition is prevented and fluidity is maintained. As a result, the neutralization reaction can be completed quickly, and aggregates are less likely to be generated. As the alkali, for example, one or more of alkali metal hydroxides such as sodium hydroxide and potassium hydroxide can be used. The concentration of the aqueous alkali solution is the water ratio after neutralization, the amount of water necessary for use in the aqueous solution of the monovalent inorganic salt of component (B) and the polyvalent inorganic salt of component (C), It is determined in consideration of the relationship of the amount of water contained in the polyol of component (D). For example, when sodium hydroxide is used as the alkali, it is preferable to use a 20 to 50% by weight aqueous solution.

  As described above, at the time of neutralization of the fatty acid and the alkali, one of the aqueous solutions of the component (B) and the component (C) is present in the reaction system. The concentration of the aqueous solution of component (B) and component (C) is determined in consideration of the solid-liquid ratio after neutralization and the amount of water in the soap composition described above. When component (D) has a water-soluble solid content, the total amount of water used can be obtained by using water used for dissolving component (B) or component (C) together with water used for dissolving component (D). Can be reduced.

  In the present invention, component (C) is preferably added to the reaction system after neutralization of the fatty acid and the alkali. By this operation, it is possible to effectively prevent the occurrence of precipitates that are considered to be caused by the component (C). It is possible to add the component (C) to the reaction system before neutralization of the fatty acid and the alkali, but in that case, a precipitate that may be attributed to the component may be generated, and the resulting soap The quality of the composition may be reduced.

  In the present invention, component (D) is preferably added to the reaction system in the presence of a fatty acid or simultaneously with the fatty acid. Alternatively, component (D) is preferably added to the reaction system in the presence of component (A). From another viewpoint, it is preferable not to mix component (D) directly with alkali. In particular, when the component (D) contains a water-soluble polysaccharide, it is preferable not to directly mix the component (D) with an alkali. Thereby, yellowing of the molten soap can be effectively prevented. Here, the yellowing of the molten soap is not supported by the theory, but it is considered that it occurs when a trace amount of amino acid contained in the component (D) reacts with an alkali by Maillard reaction.

  Since the component (D) is water-soluble, when it is used as an aqueous solution, its concentration can be easily adjusted in a wide range. For example, when the component (D) is added in the presence of the fatty acid or simultaneously with the fatty acid and then the fatty acid is neutralized with alkali, the concentration of the aqueous solution of the component (D) is related to the water ratio after neutralization described above. Is determined in consideration of In addition, when the aqueous solution of component (D) is added in the presence of the fatty acid soap that is component (A), the concentration of the aqueous solution is determined in consideration of the moisture content of the molten soap that is finally adjusted. Is done.

  The following processes can be mentioned as an example of the preferable process of the manufacturing method of this invention. First, the fatty acid is heated to a molten state. In the presence of molten fatty acid, component (B) and component (D) are added. Then, an aqueous alkali solution is added to neutralize the fatty acid. Neutralization produces component (A) and the reaction system becomes highly viscous. However, since the solid-liquid ratio after neutralization is adjusted to the above-described range, workability is not lowered. Reaction heat due to neutralization is generated, and the temperature of the reaction system rises. After completion of neutralization, an aqueous solution of component (C) is added. This reduces the viscosity of the reaction system. A molten soap is thus obtained. Aggregates are not observed in the obtained soap and no yellowing occurs.

  The following processes can also be mentioned as an example of another preferable process of the manufacturing method of this invention. First, fatty acid, component (B) and component (D) are added simultaneously in the presence of an aqueous alkaline solution. In this case, the liquid mixture which mixed the fatty acid of a molten state, and the mixed aqueous solution of a component (B) and a component (D) is prepared previously, and the said mixed liquid is added to aqueous alkali solution. By this addition, the fatty acid is neutralized to produce component (A). After completion of neutralization, an aqueous solution of component (C) is added. A molten soap is thus obtained. In the obtained molten soap, no agglomerates were observed and no yellowing occurred.

  The obtained molten soap is poured as it is into a mold and cooled and solidified. This gives a soap composition. If desired, moisture contained in the molten soap may be removed to some extent before and / or after cooling and solidification. After preparation of the molten soap, an aeration treatment may be performed and then poured into a mold. An aerated soap composition is obtained by aeration treatment.

  When aeration treatment is applied to melted soap, hydroxy acid ester surfactants and monoglyceride-based surfactants are used to prevent bubbles contained in the melted soap that has been poured into the mold after the aeration treatment and causing liquid phase separation. Surfactants, sucrose ester surfactants, and lactate ester surfactants may be added. There is no restriction | limiting in particular in the addition time of these surfactant. These surfactants are preferably contained in the total composition in an amount of 1 to 10% by weight, particularly 2 to 5% by weight.

  Furthermore, the neat soap may contain a predetermined amount of known additives used in ordinary soap compositions, such as antibacterial agents, fragrances, pigments, dyes, oils, and other mild stimulants. Examples of the antibacterial agent include triclosan and trichlorocarbanilide. Examples of the oil include lanolin, paraffin, petrolatum, isopropyl myristate, and the like. There is no restriction | limiting in particular in the addition time of these additives.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, “%” means “% by weight”.

[Example 1]
162 g of the top cut palm kernel fatty acid was heated to 80 ° C. to be in a molten state. To this, 130 g of sorbitol (70% aqueous solution) and 152 g of an aqueous solution containing 8 g of sodium chloride were added and mixed. Next, 60 g of a 48% aqueous sodium hydroxide solution was added to neutralize the fatty acid. The solid-liquid ratio after neutralization was 3.07. After completion of neutralization, 50 g of 25% aqueous sodium sulfate solution was added and mixed. The composition of the obtained soap was as shown in Table 1. The composition of the used palm kernel fatty acid was as shown in Table 2. The molten soap was aerated by whipping with a hand mixer, taking care not to evaporate moisture. The molten soap after the aeration treatment was poured into a 100 ml plastic mold and allowed to cool and solidify at room temperature to obtain a framed soap composition. The obtained frame kneaded soap composition contained bubbles.

[Example 2]
The amount of each component was the same as in Example 1, and the blending procedure was changed as follows. A 48% sodium hydroxide aqueous solution was added to and mixed with a mixture containing top cut palm kernel fatty acid, sorbitol and sodium chloride to neutralize the fatty acid. This mixed solution is prepared in advance by adding and mixing an aqueous solution containing sorbitol (70% aqueous solution) and sodium chloride in a state where the top cut palm kernel fatty acid is heated to 80 ° C. and melted. The solid-liquid ratio after neutralization was 3.07. After completion of neutralization, 25% aqueous sodium sulfate solution was added and mixed. Thereafter, a frame-kneaded soap composition was obtained in the same manner as in Example 1.

Example 3
The blending procedure was the same as in Example 1, and the blending amount of each component was changed as follows. 162 g of the top cut palm kernel fatty acid was heated to 80 ° C. to be in a molten state. The aqueous solution which consists of 130g of sorbitol (70% aqueous solution), 8g of sodium chloride, and 60g of 48% sodium hydroxide was added here, and the neutralization of the fatty acid was performed. The solid-liquid ratio after neutralization was 3.54. Finally, 50 g of 25% aqueous sodium sulfate solution was added and mixed. Thereafter, a frame-kneaded soap composition was obtained in the same manner as in Example 1.

[Comparative Example 1]
The amount of each component was the same as in Example 1, and the blending procedure was changed as follows. The top cut palm kernel fatty acid was heated to 80 ° C. to obtain a molten state. The 48% sodium hydroxide aqueous solution was added here and the neutralization of the fatty acid was performed. The solid-liquid ratio after neutralization was 4.03. Next, an aqueous solution containing sorbitol (70% aqueous solution) and sodium chloride was added and mixed. Finally, 25% aqueous sodium sulfate solution was added and mixed. Thereafter, a frame-kneaded soap composition was obtained in the same manner as in Example 1.

[Evaluation]
The molten soap obtained in Examples 1 to 3 and Comparative Example 1 was visually observed for the presence of aggregates and yellowing. Moreover, the following method evaluated the quality of workability | operativity when pouring molten soap into a type | mold. These results are shown in Table 3.

[Good or bad workability]
The workability when 400 ml of molten soap was stirred with a stirring blade in a stainless beaker kept in a warm water bath at 70 to 80 ° C. and then poured into four 100 ml plastic molds was determined according to the following criteria. It was evaluated with.
○: The viscosity of the molten soap is appropriate and easy to work.
Δ: The viscosity of the molten soap is high or the solidification is slow.
X: The viscosity of molten soap is very high, or solidification is very slow.

  As is apparent from the results shown in Table 3, it can be seen that according to the production method of each example, molten soap can be prepared without causing aggregates and yellowing. In particular, according to the manufacturing methods of Examples 1 and 2, workability is also good.

Claims (3)

(A) 38-53 wt% fatty acid soap (B) 0.5-5 wt% monovalent inorganic salt (C) 0.5-5 wt% polyvalent inorganic salt (D) 5-40 wt% % Polyols,
A method for producing a soap composition in which a molten soap having a total of component (A) and component (D) of 64.7 to 75% by weight is cooled and solidified in a mold,
The fatty acid soap of component (A) is produced by neutralization of fatty acid and alkali in the process of preparing the molten soap,
In the presence of alkali, fatty acid, component (B) and component (D) are added simultaneously to neutralize the fatty acid, then component (C) is added, and component (B) and component (C) are in aqueous solution. As a method for producing a soap composition to be supplied to a melt soap preparation process.   The method for producing a soap composition according to claim 1, wherein component (B) is sodium chloride and component (C) is sodium sulfate.   The method for producing a soap composition according to claim 1 or 2, wherein an aeration treatment is performed after preparation of the molten soap.