Method for producing soap

Abstract

To provide a method for producing soap that can easily produce foam containing more fine bubbles compared to conventional soap, using palms or a foam net.SOLUTION: There is provided a method for producing soap including: an alkali solution preparing step of placing silica colloid and rock powder in a solution of potassium hydroxide to prepare an alkali solution in which metal ions other than potassium or sodium are leached from rock powder; and a saponification step of mixing the alkali solution with fatty acids to produce soap from potassium derived from the potassium hydroxide and fatty acids while producing metal soap from the metal ions other than potassium or sodium leached from the rock powder and fatty acids.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method for producing soap. [Background technology]

[0002] Since ancient times, soap has been used to keep the face and body clean.

[0003] In particular, generating a sufficient amount of foam during washing is useful for effectively removing dirt from the skin surface and is also important for minimizing irritation to the skin.

[0004] The present inventors have focused on this point and have previously provided a scrub soap that combines good foam retention and good foam rise (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2013 / 005327 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, in order to effectively remove dirt when washing the face or body, it is said that it is better to make the individual bubbles that make up the foam as small as possible, for example bubbles with a diameter of 100 μm or less (hereinafter referred to as fine bubbles).

[0007] Cleansing foam containing fine bubbles has been produced in the past, but most of it has been produced mechanically using specialized equipment and has not been able to be easily made using the palms of one's hands or a foaming net while taking a bath, for example.

[0008] Of course, even when you use conventional soap and lather it in your palms, it does not contain no fine bubbles at all; a certain amount is still present.

[0009] However, there was a demand for a soap that could be easily prepared using the palm of the hand or a foaming net to produce a lather containing more fine bubbles than conventional soaps.

[0010] The present invention has been made in consideration of the above circumstances, and provides a method for producing soap that can easily prepare foam containing more fine bubbles than conventional soaps using the palm of the hand or a foaming net. [Means for solving the problem]

[0011] In order to solve the above-mentioned problems of the conventional art, the method for producing soap according to the present invention comprises: (1) an alkaline solution preparation step in which silica colloid and rock powder are placed in a potassium hydroxide solution to prepare an alkaline solution in which metal ions other than potassium or sodium are eluted from the rock powder; and a saponification step in which the alkaline solution is mixed with a fatty acid to produce soap from potassium derived from the potassium hydroxide and fatty acid, while also producing a metal soap from metal ions other than potassium or sodium eluted from the rock powder and fatty acid.

[0012] The method for producing soap according to the present invention is also characterized in the following respects. (2) The rock powder is a fired powder of phyllite. (3) A porous, fine spherical powder of silicic anhydride is added to the alkaline solution. Effect of the Invention

[0013] The soap manufacturing method of the present invention includes an alkaline solution preparation step in which silica colloid and rock powder are placed in a potassium hydroxide solution to prepare an alkaline solution in which metal ions other than potassium or sodium are eluted from the rock powder, and a saponification step in which the alkaline solution is mixed with a fatty acid to produce soap from the potassium derived from the potassium hydroxide and fatty acid, while also producing a metal soap from the metal ions other than potassium or sodium eluted from the rock powder and fatty acid.Therefore, it is possible to provide a soap manufacturing method that can easily produce foam containing more fine bubbles than conventional soaps using the palm of the hand or a foaming net.

[0014] Furthermore, if the rock powder is calcined powder of phyllite, metal ions other than potassium or sodium can be more reliably eluted, which promotes reliable production of metal soap.

[0015] Furthermore, if porous, fine spherical silicic anhydride powder is added to the alkaline solution, it is possible to improve the cleaning efficiency while preventing damage to the skin caused by the silicic anhydride powder. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is an explanatory diagram showing the configuration of a manufacturing facility. [Diagram 2] 2 is a flow diagram showing a method for producing soap according to the present embodiment. [Diagram 3] This is a microscopic image showing the state of soap bubbles. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The present invention relates to a method for producing soap, and in particular to a method for producing soap that can easily prepare a foam containing a larger number of fine bubbles than conventional soaps using the palm of the hand or a foaming net.

[0018] In the soap manufacturing method according to this embodiment, an alkaline solution preparation step and a saponification step are carried out.

[0019] In the alkaline solution preparation step, first, silica colloid and rock powder are placed in a potassium hydroxide solution.

[0020] The potassium hydroxide concentration in the potassium hydroxide solution is not particularly limited, but can be, for example, 5.0 w / w % to 7.0 w / w %.

[0021] Silica colloid is colloidal particulate silica, also known as colloidal silica or silica sol. It is said that when the particle diameter of silica colloid is 30 nm or less, the liquid becomes transparent, while when the particle diameter is larger than 30 nm, the liquid becomes cloudy. The silica colloid used in this embodiment is preferably one with a particle diameter of 30 nm or less that provides high liquid transparency, or a nano-sized silica colloid (silica nanocolloid).

[0022] The rock powder is obtained by crushing rock. The degree of crushing is not particularly limited, but the size of the crushed rock should be such that sufficient minerals can be eluted in a strong alkaline potassium hydroxide solution to produce a metal soap during the saponification process described below.

[0023] In addition, the powder should be crushed to a size that, after being dissolved in the alkali, does not feel granular (rough) when lathering or washing, and does not pose a risk of damaging the skin.

[0024] Such rocks can be, for example, phyllite. Among them, black stone from Tokunoshima Island is suitable because it contains a moderate amount of quartz (silicon dioxide).

[0025] The rock powder may be sintered phyllite powder. By using such a composition, the elution of minerals can be more reliably carried out.

[0026] In the alkaline solution preparation process, the silica colloid and rock powder are placed in a potassium hydroxide solution, thereby dissolving metal ions from the rock powder and preparing an alkaline solution.

[0027] There are no particular limitations on the metals to be eluted from the rock powder, and metal ions such as sodium and potassium that are commonly used in the manufacture of soap may be eluted, but at least metal ions other than sodium and potassium, such as magnesium, calcium, aluminum, etc., are eluted.

[0028] In the saponification step, the alkaline solution prepared in the alkaline solution preparation step is mixed with a fatty acid to carry out a saponification reaction.

[0029] The fatty acid can be appropriately selected depending on the intended use of the soap and the target hardness, etc., and as an example, one or more common fatty acids used in soap, including lauric acid, myristic acid, and stearic acid, can be widely used alone or in mixtures.

[0030] In the saponification reaction with fatty acids, two types of soaps are formed: one is the production of potassium soap (potassium salt of fatty acid) by the reaction of potassium derived from potassium hydroxide with fatty acid, and the other is the production of metal soap by the reaction of metal ions other than potassium or sodium with fatty acid.

[0031] Potassium soap is a soap component that functions as the main cleaning component. On the other hand, metallic soap is a soap component that plays the role of a lubricant and an insoluble granular component. In particular, the behavior of metallic soap as a lubricant and an insoluble granular component is thought to contribute to the refinement of the air bubbles that make up the foam and the increase in the generation of fine bubbles.

[0032] Furthermore, according to the soap manufacturing method of this embodiment having such a configuration, it is possible to provide a soap manufacturing method that can easily prepare a foam containing more fine bubbles than conventional soaps using the palm of the hand or a foaming net.

[0033] The alkaline solution may contain porous, fine spherical silicic anhydride powder, so-called silica balls.

[0034] Silica balls are also called spherical silica, and have an average particle size of about 5.4 to 7.1 μm. They are also characterized by being approximately spherical and having no sharp edges.

[0035] The addition of the silica balls allows them to function as a friction material, improving the cleaning efficiency while preventing damage to the skin caused by the silicic acid anhydride powder.

[0036] The method for producing soap according to this embodiment will now be described in more detail, following the actual production process. [1. Manufacturing equipment] Fig. 1 is an explanatory diagram showing the configuration of a production facility used in producing soap. As shown in Fig. 1, the production facility S includes an aqueous phase dissolver 10, an oil phase dissolver 11, and a main tank 12.

[0037] The aqueous phase dissolver 10 is a tank for preparing mainly an aqueous solution, and the oil phase dissolver 11 is a tank for preparing mainly an oil solution of fatty acids or the like.

[0038] Supply pipes are provided between the aqueous phase dissolution tank 10 and the main tank 12, and between the oil phase dissolution tank 11 and the main tank 12, allowing the liquid in each dissolution tank to be supplied to the main tank 12 via supply pumps 10a and 11a, respectively.

[0039] The main tank 12 is a tank for collecting and blending the solutions prepared in the aqueous phase dissolver 10 and the oil phase dissolver 11.

[0040] In addition, the aqueous phase dissolving tank 10, the oil phase dissolving tank 11, and the main tank 12 are each provided with a jacket portion so that the contents can be heated or cooled.

[0041] [2. Manufacturing process] Next, the manufacturing process will be described with reference to Fig. 2. In manufacturing soap, first, raw material group A shown in Table 1 is charged into an aqueous phase dissolver 10 and stirred (step S1). [Table 1]

[0042] Next, raw material group B shown in Table 2 is placed in a specified container and thoroughly stirred, and then this is poured into the aqueous phase dissolver 10 and further stirred (step S2). [Table 2]

[0043] Next, raw material C shown in Table 3 is placed in the aforementioned specified container and washed, and then charged into the aqueous phase dissolution tank 10 and stirred (step S3). [Table 3]

[0044] Next, raw material D shown in Table 4 is charged into the aqueous phase dissolution tank 10 and stirred (step S4). Note that, through at least the above-mentioned step S1 and this step S4, metal ions other than potassium or sodium are eluted from the phyllite powder, thereby carrying out the alkaline solution preparation step. [Table 4]

[0045] Next, raw material group E shown in Table 5 is charged into the aqueous phase dissolver 10 and stirred (step S5). [Table 5]

[0046] Next, raw material F shown in Table 6 is charged into the aqueous phase dissolution tank 10 and stirred (step S6). When the mixture reaches a sufficiently dispersed state where no lumps are visible, the content of the aqueous phase dissolution tank 10 is transferred to the main tank 12 (step S7). [Table 6]

[0047] Next, raw material F shown in Table 7 is charged into the aqueous phase dissolution tank 10 while simultaneously washing the inside of the aqueous phase dissolution tank 10, and then transferred to the main tank 12 (step S8). [Table 7]

[0048] Next, the liquid content of the main tank 12 is heated to 70 to 75° C. while being stirred (step S9).

[0049] Next, raw material group H shown in Table 8 is charged into the oil phase dissolver 11 and stirred while being heated to 70 to 75° C. (Step S10). [Table 8]

[0050] After the temperature is reached, the content of the oil phase dissolving tank 11 is transferred to the main tank 12, and the saponification reaction is carried out while stirring (step S11). By carrying out this step S11, the saponification step is completed.

[0051] After the saponification is completed, the liquid content of the main tank 12 is cooled to 50° C. and degassed under reduced pressure (step S12), and then cooled to room temperature (step S13).

[0052] The content of the main tank 12 thus obtained was used as soap P obtained by the soap manufacturing method according to this embodiment.

[0053] Comparative soap Q was prepared using the same manufacturing method as soap P, but without using phyllite powder in the second step.

[0054] 3. Comparative Test Next, soap P produced by the soap manufacturing method according to this embodiment, comparative soap Q, and commercially available Shirasu soap R were used as test samples, and foam was prepared in the palm of the hand using a foaming net, and the air bubbles that made up the foam were observed.

[0055] Figure 3 shows microscopic images of the foam of soap P and Shirasu soap R. Figures 3(a) and 3(b) are microscopic images of the foam of soap P at 100x and 400x magnifications, respectively, and Figures 3(c) and 3(d) are microscopic images of the foam of soap R at 100x and 400x magnifications, respectively.

[0056] First, as can be seen by comparing Figures 2(a) and 2(c), the size of the small groups of bubbles that make up the foam is smaller in soap P than in soap R.

[0057] Furthermore, as can be seen by comparing Figures 2(b) and 2(d), in terms of the size of each bubble, the bubbles of soap P contained more fine bubbles, especially bubbles with diameters below 50 μm, compared to the bubbles of soap Q.

[0058] Although not shown in the figure, a comparison between soap P and comparative soap Q also showed that the foam of soap P contained many finer air bubbles than the foam of comparative soap Q.

[0059] As described above, the soap manufacturing method of this embodiment includes an alkaline solution preparation step in which silica colloid and rock powder are placed in a potassium hydroxide solution to prepare an alkaline solution in which metal ions other than potassium or sodium are eluted from the rock powder, and a saponification step in which the alkaline solution is mixed with a fatty acid to produce soap from the potassium derived from the potassium hydroxide and fatty acid, while also producing a metal soap from the metal ions other than potassium or sodium eluted from the rock powder and fatty acid.Therefore, it is possible to provide a soap manufacturing method that can easily produce foam containing more fine bubbles than conventional soaps using the palm of the hand or a foaming net.

[0060] Finally, the above-mentioned embodiments are merely examples of the present invention, and the present invention is not limited to the above-mentioned embodiments. Therefore, even if the above-mentioned embodiments are different, various modifications can be made depending on the design, etc., as long as they do not deviate from the technical idea of ​​the present invention. [Explanation of symbols]

[0061] 10 Dissolution tank for aqueous phase 11 Dissolution tank for oil phase 12 Main Tank S Manufacturing equipment

Claims

1. an alkaline solution preparation step of preparing an alkaline solution in which silica colloid and rock powder are present in a potassium hydroxide solution, and metal ions other than potassium or sodium are eluted from the rock powder; a saponification step in which the alkaline solution is mixed with a fatty acid to generate soap from potassium derived from the potassium hydroxide and fatty acid, while generating metal soap from metal ions other than potassium or sodium dissolved from the rock powder and fatty acid; A method for producing a soap having the above formula.

2. 2. The method for producing soap according to claim 1, wherein the rock powder is calcined powder of phyllite.

3. 3. The method for producing soap according to claim 1, wherein porous, fine spherical powder of silicic anhydride is added to the alkaline solution.

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