Liquid cleaning agents

Abstract

To provide a liquid detergent which has good detergency, foaming and foam-cutting properties even in the same amount as a synthetic detergent which is said to be gentle on the skin, and is gentle on the skin. [Solution] The liquid detergent of the present invention is a liquid detergent containing a soap component including a fatty acid salt and hot spring water.

Description

[Technical field]

[0001] The present invention relates to a liquid cleanser that is gentle on the skin. [Background technology]

[0002] Conventionally, liquid detergents with high detergency have been used as detergents for cleaning objects.

[0003] On the other hand, liquid detergents are also used which have less cleaning power but are gentler on the hands. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] https: / / www.coopclean.co.jp / qa / kitchen_02 / Summary of the Invention [Problem to be solved by the invention]

[0005] However, most commercially available liquid detergents used to clean objects are highly powerful and foam well, and while these are good for cleaning objects, the cleaning ingredients can be too strong and can cause irritation when used by people with sensitive skin with bare hands.

[0006] Although there are liquid detergents that are said to be less irritating to the skin, they have poor cleaning power and foaming, so they are difficult to remove oil and may not function as a liquid detergent.Furthermore, they are less irritating to the skin than liquid detergents with high cleaning power, but they can cause rough hands, so some people wear rubber gloves when using liquid detergents with high cleaning power.

[0007] Among liquid detergents, there are liquid soaps that are said to be less irritating to the skin, but to achieve the same cleaning power as synthetic detergents for the kitchen, a large amount of liquid soap is required, as shown in Non-Patent Document 1, which is problematic from an environmental perspective. Furthermore, it can cause dry skin after use.

[0008] Traditionally, hot spring water has been thought to have the effect of retaining moisture in the skin and moisturizing it, and there are solid soaps made from hot spring water for beauty purposes. However, these soaps are beauty soaps for the body, so they do not have the cleaning power to clean objects such as oil stains. Furthermore, because they are not liquid, they are not convenient when cleaning objects.

[0009] The object of the present invention is to provide a liquid detergent that has good cleaning power, foaming, and foam-rinsing properties in the same amount as synthetic detergents that are said to be gentle on the skin, and is also gentle on the skin. The liquid detergent in this invention means a detergent that has fluidity.

[0010] [Means for solving the problem]

[0011] The present invention, which has been made for this purpose, has been able to solve the problems by the following means. (1) A liquid detergent containing a soap component including fatty acid salts and hot spring water.

[0012] (2) A method for manufacturing a liquid cleaning agent using oils and hot spring water.

[0013] (3) A liquid cleaning agent containing soap components obtained by reacting oils and fats with alkaline components in hot spring water.

[0014] (4) A method for producing a liquid detergent, characterized by using a soap component obtained by reacting oils and fats with an alkaline component in hot spring water. Effect of the Invention

[0015] The present invention relates to a liquid detergent, which has good detergency, foaming and foam-rinsing properties even when used in the same amount as a synthetic detergent that is said to be gentle on the skin, and is also gentle on the skin. [Brief description of the drawings]

[0016] [Figure 1] Condition of hand skin after use of Example 1. [Diagram 2] Condition of hand skin after use of Comparative Example 2. [Diagram 3] Condition of hand skin after use of Comparative Example 3. [Figure 4] Chili oil placed in a Tupperware container. [Diagram 5] The liquid detergent of Example 1, the liquid detergent of Comparative Example 2, a sponge, and water were placed in a Tupperware container. [Figure 6] The foaming of the liquid detergent of Example 1 and the liquid detergent of Comparative Example 2 was compared. [Figure 7] Comparison of cleaning power between the liquid detergent of Example 1 and the liquid detergent of Comparative Example 2 in a Tupperware container. [Figure 8] Comparison of cleaning power of the liquid detergent of Example 1 and the liquid detergent of Comparative Example 2 using a sponge. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The following describes embodiments of the present invention. The present invention is not limited to the following embodiments. The following embodiments can be combined as appropriate.

[0018] The liquid detergent according to the present invention is formed from fatty acid salt and hot spring water as main components. The raw materials for forming the liquid detergent are described in detail below.

[0019] (A) Fatty acid salt Examples of the fatty acid salt according to the present invention include fatty acid sodium salt and fatty acid potassium salt. Two or more types of fatty acid salts may be contained. The content of fatty acid salt is preferably 10 to 65% by mass based on the total mass of the liquid detergent. In order to maintain easy-to-handle fluidity, the content of fatty acid salt is more preferably 60% by mass or less based on the total mass of the liquid detergent.

[0020] As the raw material for the fatty acid salt according to the present invention, fats and oils are used. Fat and oils include animal-derived fats and oils and oils and oils derived from plants, and fats and oils derived from plants are more preferable. Furthermore, it is preferable that the vegetable fats and oils are mainly composed of saturated fatty acids with only single bonds, or monounsaturated fatty acids with one double bond. Examples of saturated fatty acids with only single bonds include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and arachidic acid. Unsaturated fatty acids include monounsaturated fatty acids with one double bond and polyunsaturated fatty acids with two or more double bonds. Examples of monounsaturated fatty acids include palmitoleic acid and oleic acid, and examples of polyunsaturated fatty acids include linoleic acid and linolenic acid.

[0021] Examples of vegetable oils containing such saturated fatty acids or monounsaturated fatty acids as the main component include camellia oil, olive oil, high oleic sunflower oil, high oleic safflower oil, tea oil, almond oil, macadamia nut oil, apricot kernel oil, palm kernel oil, palm oil, coconut oil, avocado oil, rapeseed oil, and shea butter.

[0022] When vegetable oils and fats are used, it is preferable to use a mixture of two or more kinds. At least one of them is preferably a saturated fatty acid with only a single bond or a monounsaturated fatty acid with one double bond as a main component. Furthermore, it is preferable that at least one of them is a vegetable oil and fat that mainly contains oleic acid.

[0023] The fatty acid content of the fatty acid salt is preferably 20% or more of oleic acid, 3% or more of lauric acid, and 3% or more of myristic acid relative to the total mass of the fatty acids. By adjusting the content of each of these specific fatty acids within a specific range, it is possible to provide a rich, dense, fine foam, thereby improving the cleaning power and foaming.

[0024] An alkaline raw material such as potassium hydroxide or sodium hydroxide is used for saponifying vegetable oils and fats, i.e., producing fatty acid salts. It is preferable to add an amount of alkaline raw material necessary to saponify all of the vegetable oils and fats based on the total mass of the vegetable oils and fats and to maintain the pH value after saponification in the range of 9 or more and less than 11. In addition, the total amount of fatty acid salts and hot spring water is preferably 60% by mass or more based on the total mass of the liquid detergent.

[0025] (B)Hot spring water The hot spring water that constitutes the liquid detergent of the present invention refers to water that has a temperature of 25 degrees Celsius or higher when it springs from the ground, or water that contains at least one of the 19 specific components designated by the Ministry of the Environment. The list of the 19 specific components provided by the Ministry of the Environment is shown in Table 1.

[0026] [Table 1]

[0027] The hot spring water, which is a raw material for forming the liquid detergent according to the present invention, may also contain mineral springs, which are a part of hot springs as defined by the Hot Springs Law. A mineral spring is defined as hot water or mineral water that springs from the ground, according to the Ministry of the Environment's Mineral Spring Analysis Guidelines, and is either one that contains a large amount of solid, gaseous, or special substances, or whose spring temperature is always significantly higher than the annual average temperature around the source.

[0028] The hot spring water used as the raw material of this invention contains some components that are not listed in the hot spring analysis report, and it is believed that no two hot springs are the same in different regions, and the strength of the effects may vary, but they are generally effective on the skin. However, liquid cleansers are mainly used in close proximity to the nose. For this reason, it is preferable to use hot spring water with a total weight of the hot spring water components "hydrogen sulfide ion," "thiosulfate ion," and "free hydrogen sulfide" of 2 mg / kg or less in terms of scent.

[0029] The hot spring water used to form the liquid detergent according to this embodiment contains some ingredients that are not listed in the hot spring analysis report, and it is believed that no two hot springs in different regions are the same. Although the effects of each hot spring water may vary, they are generally effective on the skin. However, if the content of only one ingredient is excessive, it may cause skin irritation. For this reason, it is preferable to use hot spring water that contains two or more types of ingredients in the anions and cations at 20 mval% or more, and it is even more preferable to use hot spring water that contains three or more types.

[0030] The ratio of hot spring water for forming the liquid detergent according to the present invention is preferably 10 to 85% by mass with respect to the total mass of the liquid detergent. If the ratio of hot spring water is 10 to 40% by mass, the liquid detergent becomes highly viscous, and effects such as removal of dirt from slopes, space-saving storage, and high concentration cleaning of stubborn dirt can be expected, and the effects of this embodiment can be fully demonstrated. By adjusting the moisture ratio according to the purpose, from a liquid detergent with a low moisture content and a high moisture content, a liquid detergent with excellent cleaning effect and gentle on the skin can be obtained. The liquid detergent of the present invention may become viscous or solidify due to a drop in temperature, but it can be returned to a liquid state by heating the container with warm water.

[0031] Some hot spring water contains metasilicic acid. Metasilicic acid is thought to promote the production of ceramide, and is expected to protect the skin from dryness. Ceramide accounts for about 50% of the intercellular lipids that fill the gaps between stratum corneum cells, and has the property of connecting both oil and water. In the stratum corneum, ceramides connect with each other and form a structure in which they overlap with layers of water (lamellar structure), while the intercellular lipids fill the gaps between the stratum corneum cells. If ceramide decreases and this structure is disrupted, the skin's barrier function decreases, making it more vulnerable to external stimuli and more susceptible to skin problems.

[0032] When using conventional liquid detergents, this structure is often disrupted, which is thought to lead to skin problems. Metasilicic acid is not contained in all hot spring water. Therefore, rice bran can be used as a secondary ingredient to supplement metasilicic acid and as an example of a raw material for plant-derived ceramide. By using rice bran, the synergistic effect with other hot spring ingredients can be expected to further reduce skin problems on the hands.

[0033] Examples of secondary ingredients that can be used to enhance the skin's barrier function include the aforementioned rice bran, beeswax that protects the sebum film, and cocoon balls that contain serine, the amino acid most abundant in the natural moisturizing factors found in human skin. In addition to the above, wheat, konjac yam, soybeans, corn, koji, lees, hijiki, chestnuts, yuzu, mandarin oranges, peaches, apples, soft-shelled turtles, chicken, fish, beef, pork, and honey can also be used as secondary ingredients. Using these as secondary ingredients can be expected to further reduce skin problems on the hands.

[0034] The content of the auxiliary material that can be contained to improve the barrier function is preferably 30% by mass or less based on the total mass of the raw materials.

[0035] If it is necessary to further accelerate the saponification, absolute ethanol may be used as necessary, and the content of absolute ethanol may be 40% by mass or less based on the total mass of the vegetable oils and fats.

[0036] The liquid cleaner according to the present invention may use essential oils for fragrance, if necessary. Essential oils include floral, citrus, herbal, woody, spice, resin, exotic, etc., and are preferably used according to the purpose. These may be mixed. Floral oils include, for example, lavender, geranium, neroli, palmarosa, Roman chamomile, and mimosa. Citrus oils include, for example, lemon, melissa, citronella, lemongrass, orange sweet, mandarin, bergamot, grapefruit, yuzu, lime, and bitter orange. Herbal oils include, for example, clary sage, marjoram sweet, fennel, spearmint, peppermint, lemon tea tree, basil, peppermint, and rosemary. Examples of woody materials include Japanese cypress, Japanese cypress, Japanese cedar, Japanese cypress, Eucalyptus radiata, Eucalyptus citriodora, Eucalyptus globulus, Cypress, Juniper berry, Cedarwood, Tea tree, Petitgrain, Pine needle, and Ho wood. Examples of spice materials include cardamom, coriander, cinnamon leaf, ginger, and black pepper. Examples of resin materials include elemi, frankincense, benzoin, and myrrh. Examples of exotic materials include ylang-ylang, sandalwood, patchouli, palmarosa, and petiper. It is desirable that the amount of essential oil is 5% by mass or less of the total mass of the liquid cleaning agent.

[0037] -How liquid cleaning agents are manufactured The liquid detergent according to this embodiment can be produced, for example, by the following procedure, although the production method is not limited thereto. First, in step 1, vegetable oil is heated. The heating temperature may be in the range of 60°C to 85°C. Next, in step 2, an alkaline raw material is added to hot spring water having a predetermined component that has been prepared in advance, and the alkaline raw material is dissolved in the hot spring water by thoroughly stirring. Then, in step 3, alcohol is mixed uniformly into the vegetable oil heated as in "step 1" above. Finally, in step 4, the mixture from "step 3" above and the mixture from "step 2" above are mixed and kept warm so that saponification (hydrolysis of the oil into fatty acid salts and glycerin using a base) is maintained. For example, a liquid detergent can be manufactured by these steps. EXAMPLES

[0038] The present embodiment is described in detail below, but the present invention is not limited to the following. Example 1 The liquid detergent of Example 1 was produced using the following ingredients. Vegetable oil: Olive oil 135g Palm kernel oil 50g Palm oil - 15g Water: 100g of room temperature hot spring water A (simple alkaline hot spring) Main components of hot spring water A (only those above 20mval% are shown) (Cation) Sodium ion 68.86mval% Calcium ion 29.99mval% (Anion) Sulfate ion 72.56mval% 60g absolute ethanol Sodium hydroxide 29g

[0039] Using these raw materials, a liquid detergent was produced according to the following procedure. Step 1. Heat the vegetable oil to 75℃~85℃. Step 2. Dissolve sodium hydroxide in hot spring water. Step 3. Mix anhydrous ethanol with the vegetable oil from step 1 above. Step 4. Mix the mixture from "Step 3" above with the mixture from "Step 2" above and saponify (hydrolyze the oils and fats into fatty acid salts and glycerin using a base). Step 5: The container containing the mixture from step 4 is kept warm for 24 hours or more to maintain the chemical reaction of the mixture. After this, approximately 380 g of a highly viscous liquid detergent was obtained. Step 6: 760 g of hot spring water A was added to the liquid cleaning agent obtained in "Step 5" above. According to these procedures, the liquid detergent of Example 1 was produced.

[0040] Example 2 In Example 2, a liquid cleaning agent was produced in the same manner as in Example 1, except that hot spring water B described below was used as a raw material instead of hot spring water A in Example 1. Hot spring water B: Sodium chloride bicarbonate spring (Cation) Sodium ion 92.40mval% (Anion) Chloride ion 66.61mval% Hydrogen carbonate ion 33.11mval%

[0041] Example 3 In Example 3, a liquid cleaning agent was produced in the same manner as in Example 1, except that the hot spring water C described below was used as a raw material instead of the hot spring water A in Example 1. Hot spring water C: Sodium sulfate chloride cold spring (Cation) Sodium ion 92.41mval% (Anion) Sulfate ion 50.09mval% Chloride ion 32.78mval%

[0042] Example 4 In Example 4, a liquid cleaning agent was produced in the same manner as in Example 1, except that hot spring water D described below was used as a raw material instead of hot spring water A in Example 1. Hot spring water D: Sodium chloride spring (Cation) Sodium ion 96.11mval% (Anion) Chloride ion 76.89mval%

[0043] Example 5 In Example 5, a liquid cleaning agent was produced in the same manner as in Example 1, except that the hot spring water E described below was used as a raw material instead of the hot spring water A in Example 1. Hot spring water E: Simple carbon dioxide cold spring (Cation) Calcium ion 48.53mval% Sodium ion 42.05mval% (Anion) Hydrogen carbonate ion 61.32mval% Sulfate ion 22.92mval%

[0044] Example 6 In Example 6, a liquid cleaning agent was produced in the same manner as in Example 1, except that the hot spring water F described below was used as a raw material instead of the hot spring water A in Example 1. Hot spring water F: Alkaline simple hot spring (Cation) Sodium ion 95.39mval% (Anion) Hydrogen carbonate ion 22.61mval% Sulfate ion 46.94mval%

[0045] Example 7 In Example 7, a liquid cleaning agent was produced in the same manner as in Example 1, except that the hot spring water G described below was used as a raw material instead of the hot spring water A in Example 1. Hot spring water G: Alkaline simple hot spring (Cation) Sodium ion 88.54mval% (Anion) Sulfate ion 63.93mval% Chloride ion 27.14mval%

[0046] Example 8 In Example 8, a liquid detergent was produced in the same manner as in Example 1, except that absolute ethanol was not added.

[0047] Example 9 In Example 9, a liquid detergent was produced in the same manner as in Example 1, except that 1 g of beeswax was dissolved in "Step 1" of Example 1, and 1.0 g of rice bran and 1.0 g of cocoon balls were dissolved in "Step 2."

[0048] Comparative Example 1 In Comparative Example 1, a liquid detergent was produced in the same manner as in Example 1, except that tap water was used as the raw material instead of the hot spring water A in Example 1.

[0049] Here, "mval", which expresses the composition of hot spring ingredients, is a unit that represents the electrical charge of an ion, and is one thousandth of the ion equivalent (val) contained in 1 kg of hot spring water.

[0050] The millival value is specifically expressed by the following formula: Millibar = Amount of component contained in 1 kg of hot spring water (mg) ÷ atomic weight (or molecular weight) × ionic valence

[0051] Additionally, "millival %" refers to the millival value of one type of cation that constitutes the hot spring water components, divided by the total millival value of the cations and multiplied by 100. The same applies to anions.

[0052] Examples 1 to 9 and Comparative Example 1 were evaluated for 1. cleaning power, 2. foaming, and 3. moisturizing the hands. The evaluation methods were as follows.

[0053] 1. Cleansing power, 2. Foaming The cleaning power of Examples 1 to 9 and Comparative Example 1 was evaluated as follows. First, two teaspoons of chili oil were evenly spread on each of the Tupperware of Examples 1 to 9 and Comparative Example 1. Next, a new sponge was placed in each Tupperware, and one tablespoon of water and one teaspoon of each of Examples 1 to 9 and Comparative Example 1 were poured on the sponge.

[0054] "2. Foaming" was evaluated as follows. In Examples 1 to 9 and Comparative Example 1, the container was planned to be kneaded 30 times each in the Tupperware, but in both cases, the foam overflowed from the Tupperware after kneading 20 times. For this reason, the number of kneading times was stopped at 22 times. Therefore, all cases were excellent in "2. Foaming", and no difference was observed.

[0055] "1. Cleaning power" was evaluated based on the amount of chili oil remaining in the Tupperware. The sponge was removed from each Tupperware, and the foam remaining in the Tupperware was washed away with running water to confirm the cleaning power. In all of Examples 1 to 9 and Comparative Example 1, there was no chili oil remaining even in the four corners of the Tupperware, and the entire container felt squeaky. Therefore, all of the "1. Cleaning power" was excellent, and no differences were observed.

[0056] "1. Cleaning power" was evaluated based on the degree of adhesion of the chili oil to the sponge. The state of the sponge after lathering was observed for Examples 1 to 9 and Comparative Example 1. In all cases, almost no chili oil was attached to the sponge. Even after the foam inside the Tupperware was washed away with running water, almost no chili oil remained in each Tupperware. This is thought to be because the chili oil was absorbed into the foam. Therefore, all cases had excellent "1. Cleaning power", and no differences were observed.

[0057] 3. Moisturizing your hands Using the liquid detergents of Examples 1 to 9 and Comparative Example 1, dishes were washed with bare hands, and the moisture of the hands was measured before washing and 20 minutes after washing. The measurements were performed on the right palm in order to keep the measurement site the same. The moisture was measured using a belulu Skin Checker manufactured by Beautiful Angel Co., Ltd. The subjects had sensitive skin to the extent that they would develop chapped hands in winter.

[0058] When the result was no different from Comparative Example 1, it was evaluated as "△", and when the result was better than the Comparative Example, it was evaluated as "◯". The results are shown in Table 2.

[0059] [Table 2]

[0060] As is clear from Table 2, Examples 1 to 9 had similar cleaning power and foaming power as Comparative Example 1, but the moisture of the hands was significantly improved. In detail, Comparative Example 1 had a 5% decrease in moisture after washing the dishes compared to before washing the dishes. On the other hand, Examples 1 to 9 all had a 3 to 10% increase in moisture after washing the dishes compared to before washing the dishes.

[0061] Next, to compare the above-mentioned Example 1, the commercially available detergent of Comparative Example 2 (without hot spring water) which is said to be gentle on the hands, and the commercially available detergent of Comparative Example 3 (without hot spring water) which is said to have a high cleaning power, dishes were washed with bare hands using each detergent, and the moisture and grease of the hands were measured before washing the dishes and 20 minutes after washing the dishes. The measurements were performed on the right palm in order to keep the measurement points the same.

[0062] The cleaning power, foaming, foaming loss, and amount of foam remaining at the drain when rinsing are shown in Table 3. The condition of the hands after using Example 1 is shown in Fig. 1, the condition of the hands after using Comparative Example 2 in Fig. 2, and the condition of the hands after using Comparative Example 3 in Fig. 3.

[0063] [Table 3]

[0064] A questionnaire survey was conducted on 100 people regarding the feeling on their hands after using the liquid detergent of Example 1. Compared to Comparative Examples 2 and 3, 100% of the respondents answered that their hands felt "moist."

[0065] The cleaning power, foaming, and foam state are compared between Example 1 and Comparative Example 2. Figures 4 to 8 show comparative photographs.

[0066] Figure 4 is a photograph of each of the above containers after two teaspoons of chili oil had been evenly spread over them.

[0067] FIG. 5 is a photograph of a new sponge after one tablespoon of water and one teaspoon of the liquid cleaning agent of Example 1 and Comparative Example 2 were poured onto the sponge.

[0068] Fig. 6 shows a photograph taken after kneading 30 times in the Tupperware, but in Example 1, the foam overflowed from the Tupperware after 20 kneads, and the number of kneads was stopped at 22. In Comparative Example 2, the foam did not overflow from the Tupperware even after 20 kneads, so a photograph is taken after kneading 30 times as planned. When the foam in Comparative Example 2 was touched, it was watery and not elastic. When the foam in Example 1 was touched, it was elastic and had a strong force of bouncing off the fingers that touched it.

[0069] Figure 7 is a photograph showing the cleaning power of the Tupperware of Example 1 and Comparative Example 2, which was not rubbed with a sponge, but only had the foam removed with running water. The Tupperware of Comparative Example 2 had residual chili oil both in appearance and to the touch, with residual chili oil remaining all over. Example 1 had no residual chili oil even in the four corners, and the whole container had a squeaky feel.

[0070] Fig. 8 shows photographs of the state of the sponge after whipping in Example 1 and Comparative Example 2. Comparative Example 2 had a large amount of chili oil on the sponge. Example 1 had no chili oil on the sponge compared to Comparative Example 2. In Example 1, no chili oil remained in the Tupperware even after the foam in the Tupperware was washed away with running water, so it seems that a large amount of chili oil was absorbed into the foam.

[0071] For example, commercially available liquid detergents for the kitchen are often divided into neutral detergents for washing dishes and alkaline liquid detergents for stove stains and burnt-on food, but the present invention can be used without distinction for washing dishes and removing stove stains and burnt-on food. Table 4 shows the intended uses of neutral detergents and alkaline liquid detergents from the Ministry of Education, Culture, Sports, Science and Technology's Sports, Youth, and School Health Education Division.

[0072] [Table 4]

[0073] Commercially available liquid dishwashing detergents are mainly neutral due to concerns about rough hands, and alkaline detergents are often used with gloves to remove oil stains and tea stains from stoves. The liquid detergent of the present invention is weakly alkaline, but has the characteristic that the detergent ingredients do not remain on the skin. Furthermore, hot spring water is said to have moisturizing effects, collagen production support effects, blood circulation improvement effects, skin dryness prevention effects, skin texture improvement effects, skin extensibility improvement effects, and skin softening effects, and is expected to have anti-aging effects that replenish moisture to the skin and give it firmness and moisture, and it is thought that these effects, combined with the above effects, make it less likely to cause rough hands. There is no single hot spring water that is identical in terms of the specific ingredients or composition, types of chemical ingredients, and their contents that have such effects, and it is difficult to say anything at this time because there are so many to investigate.

[0074] Because this liquid detergent is gentle on the hands, it can be used without using rubber gloves, even when washing dishes and removing acidic stains, which account for around 80% of household stains.

[0075] This liquid detergent is gentle on the skin, so it can be used not only to clean objects in the kitchen and bathroom, but also on the body.

[0076] Since the present invention does not contain petroleum-based synthetic surfactants, it may be thought that the cleaning power is inferior to cleaners that do contain them. However, by using fatty acids and hot spring water without adding petroleum-based synthetic surfactants and forming rich, dense, fine bubbles, the cleaning power has been improved and the foaming has also been improved.

[0077] The aforementioned high density, rich, fine foam increases the amount of oil absorbed, improving cleaning power.

[0078] Commercially available detergents with strong cleaning power have poor foam decomposition, to the point where foam remains in the drain, and require a lot of water to remove the foam, which takes a long time. However, the liquid detergent of the present invention has weak chemical bonds, so it quickly loses its surfactant effect when it comes into contact with calcium ions and magnesium ions contained in tap water. This allows the foam to be easily removed during rinsing, and the process can be completed in a short time with less water used, making it an environmentally friendly detergent. Furthermore, tests at an analysis center have shown that the present invention is easily biodegradable by microorganisms, making it an environmentally friendly invention in terms of biodegradability.

[0079] Commercially available cleansers contain many synthetic petroleum-based surfactants, which tend to remain on the skin and penetrate the stratum corneum, which plays a role in moisturizing and acting as a barrier, causing the stratum corneum to swell (the volume of the stratum corneum increases as the surfactant solution penetrates). This disrupts the lamellar structure (in the stratum corneum, ceramides, etc. are connected to each other and overlap with layers of water, with intercellular lipids filling the gaps between the stratum corneum cells). This weakens the skin's barrier function, making it more vulnerable to external stimuli and more susceptible to skin problems. This leads to the loss of natural moisturizing ingredients that retain moisture, making the skin more susceptible to external influences and causing excessive evaporation of moisture. As a result, it also affects the turnover (regeneration of the stratum corneum).

[0080] Especially in winter, people often wash dishes with hot water. Hot water dissolves sebum, so it not only washes away dirt from dishes, but also the sebum, which, combined with petroleum-based surfactants, often causes severe skin problems on the hands. It also disrupts the antagonistic state of the resident bacteria that protect the skin on the hands, weakening the skin's barrier function and making it more susceptible to skin problems. For more information on resident bacteria, see https: / / www.jstage.jst.go.jp / article / bopiph / 47 / 0 / 47_47 / _pdf.

[0081] However, the present invention has good foam-rinsing properties and is less likely to leave surfactants on the hands. Furthermore, because hot spring water is used as a raw material for the present invention, this, combined with the beneficial effects of hot spring water on the skin, is thought to leave the hands moisturized after use.

[0082] Since hot spring water is used as a raw material for the present invention, the barrier function of the skin on the hands is improved every time the present invention is used due to the beneficial effects of hot spring water on the skin as described above.

[0083] The liquid detergent of the present invention has a feature that it loses its surfactant effect quickly when it comes into contact with calcium ions or magnesium ions contained in tap water because the chemical bond is weak. Because of this feature, it has the advantage that the foam is easily removed and the surfactant is not easily left on the skin, so the burden on the skin is relatively small. Petroleum-based synthetic surfactants do not easily lose their surfactant effect even when diluted with water, and if not washed thoroughly, the cleaning ingredients will remain on the skin. If the surfactant remains on the skin for a long time, the barrier function of the skin will be weakened and it may cause skin trouble. Although the effectiveness of general petroleum-based synthetic surfactants continues even after being poured down the drain, and some of them are difficult to decompose in the natural environment, the surfactant effect of the liquid detergent of the present invention weakens when diluted with water. In addition, since it is an organic substance, it is easily decomposed in the natural environment. Since the present invention is a fatty acid salt made from vegetable oil and hot spring water, it is less likely to wash away the intercellular lipids necessary for the barrier function of the skin compared to petroleum-based synthetic surfactants. Furthermore, since hot spring water is used as the raw material of the present invention, the skin will be moisturized after use, combined with the beneficial effects of hot spring water on the skin. Liquid detergents made from fatty acid salts are said to have weak cleaning power if not used in large quantities, but the present invention provides high density, abundant foam, which gives it strong cleaning power, and because it is weakly alkaline, it can be used to wash dishes and even remove acidic stains such as burnt food and tea stains. It is said that 80% of the dirt in the home is acidic, so it has a wide range of uses. [Industrial Applicability]

[0084] Kitchen: Washing dishes, removing grease from the ventilation fan, stove, grill and walls, burnt food from the stove and grill, removing slime from the sink and drain, etc. - Bathroom: Removes slime, dirt on mirrors, oily stains, limescale, etc. - Laundry stains, sebum and protein stains, removing mold from the washing machine drum, etc. Living room: Removes fingerprints, stains on glass, cigarette tar, etc. Body washing including scalp

Claims

1. A step (I) of heating vegetable oil to a temperature of 60°C to 85°C to obtain a heated vegetable oil; A step (II) of adding hot spring water having a total weight of hydrogen sulfide ions, thiosulfate ions, and free hydrogen sulfide of 2 mg / kg or less and an alkaline raw material to the heated vegetable oil while maintaining the temperature of the heated vegetable oil; Step (III) of keeping the mixture obtained in step (II) warm so as to maintain the saponification reaction and obtain a highly viscous liquid; and step (IV) of adding and mixing hot spring water having a total weight of hydrogen sulfide ions, thiosulfate ions and free hydrogen sulfide of 2 mg / kg or less to the highly viscous liquid obtained in step (III) so that the total weight of the liquid detergent is 10 to 85 mass %.

2. A method for producing a liquid cleaning agent as described in claim 1, wherein alcohol is added in step (II).

3. A liquid cleaning agent produced by the manufacturing method of claim 1 or claim 2.

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