Liquid detergent

Abstract

To provide a liquid detergent which, in the same amount as a synthetic detergent said to be gentle on the skin, exhibits good detergency, foaming properties, and good rinse-off properties, while also being gentle on the skin.SOLUTION: A liquid detergent comprises a soap component containing hot spring water and a fatty acid salt.SELECTED DRAWING: Figure 1

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 that 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, commercially available liquid detergents for cleaning objects are mostly liquid detergents with strong cleaning power and good foaming, and while they are good for cleaning objects, when used by people with sensitive skin with bare hands, the cleaning ingredients can be too strong and can cause rough hands.

[0006] Although there are liquid detergents that are said to be gentle on the skin, they have poor cleaning power and foaming properties, making it difficult to remove oil and making it difficult to feel the effects of the liquid detergent.Furthermore, while they are less irritating to the skin than liquid detergents with high cleaning power, they can still 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 dishwashing detergents, for example, 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] It has long been believed that hot spring water retains moisture in the skin and has the effect of moisturizing the skin, and so there are bar 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 oily stains. Furthermore, because they are not liquid, they are inconvenient when cleaning objects.

[0009] The objective of the present invention is to provide a liquid detergent that has good detergency, foaming, and foam-rinsing properties in the same amount as synthetic detergents that are known to be gentle on the hands and 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 has been made 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 detergent 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. [Effects of the Invention]

[0015] The present invention relates to a liquid detergent which has good detergency, foaming and foam rinsing properties in the same amount as synthetic detergents known to be gentle on the hands and skin, and is also gentle on the skin. [Brief explanation of the drawings]

[0016] [Figure 1] Condition of hand skin after use of Example 1. [Figure 2] Condition of hand skin after use of Comparative Example 2. [Figure 3] Condition of hand skin after use of Comparative Example 3. [Figure 4] Chili oil placed inside a Tupperware container. [Figure 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 INVENTION

[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 salts and hot spring water as main ingredients. The raw materials for forming the liquid detergent are described in detail below.

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

[0020] Fats and oils are used as raw materials for the fatty acid salts of the present invention. Fats and oils include animal-derived and plant-derived oils and oils, with plant-derived oils being more preferable. Furthermore, it is preferable that the plant oils and oils be primarily 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 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 types. At least one type preferably contains, as a main component, a saturated fatty acid with only a single bond or a monounsaturated fatty acid with one double bond. Furthermore, it is preferable that at least one type of vegetable oil and fat contains mainly 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 these specific fatty acids within a specific range, it is possible to provide high-density, rich, fine foam, and improve cleansing power and foaming.

[0024] To saponify vegetable oils and fats, i.e., to produce fatty acid salts, alkaline raw materials such as potassium hydroxide and sodium hydroxide are used. The alkaline raw material is preferably added in an amount sufficient to saponify all of the vegetable oil and fats and to maintain a pH value after saponification in the range of 9 or more and less than 11. The total amount of fatty acid salts and hot spring water is preferably 60% by mass or more of the total mass of the liquid detergent.

[0025] (B)Hot spring water The hot spring water used in the liquid detergent of this invention is water that has a temperature of 25°C or higher when it bubbles up 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 used as a raw material for forming the liquid detergent of the present invention may also include mineral springs, which are a type of hot spring as defined by the Hot Springs Act. Mineral springs are defined as hot water or mineral spring water that springs from the ground, as defined in the Ministry of the Environment's Mineral Spring Analysis Guidelines, and are either hot springs that contain large amounts 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 for this invention contains components not listed in the hot spring analysis report, and it is believed that no two hot springs are the same in different regions. While the strength of the effects may vary, they are generally effective on the skin. However, liquid cleansers are primarily used close to the nose. For this reason, it is preferable to use hot spring water with a combined scent of 2 mg / kg or less of the hot spring water components "hydrogen sulfide ions," "thiosulfate ions," and "free hydrogen sulfide."

[0029] The hot spring water used to make the liquid cleanser according to this embodiment contains components not listed in the hot spring analysis report, and it is believed that no two hot springs are the same in different locations. While the effects of each hot spring water may vary, they are generally effective on the skin. However, excessive concentrations of a single component may cause skin irritation. For this reason, it is preferable to use hot spring water containing two or more components in anions and cations at 20 mVal% or more, and even more preferable to use hot spring water containing three or more components.

[0030] The proportion of hot spring water used to form the liquid detergent of the present invention is preferably 10 to 85% by mass based on the total mass of the liquid detergent. By using a hot spring water proportion of 10 to 40% by mass, a highly viscous liquid detergent can be obtained, which is expected to enable the removal of dirt from slopes, space-saving storage, and high-concentration cleaning of stubborn dirt, thereby fully demonstrating the effects of this embodiment. By adjusting the water content to suit the application, from a highly viscous liquid detergent with low water content to a liquid detergent with high water content, it is expected that a liquid detergent with excellent cleaning effectiveness 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 restored to a liquid state by heating the container in warm water.

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

[0032] Using conventional liquid cleansers often disrupts this structure, which is thought to make skin more susceptible to problems. Metasilicic acid is not found in all hot spring water. Therefore, rice bran can be used as a secondary ingredient, as it not only complements metasilicic acid but also acts as a raw material for plant-derived ceramides. By using rice bran, the synergistic effect with other hot spring ingredients can be expected to further reduce hand skin problems.

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

[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 needed, as long as the content of absolute ethanol is 40% by mass or less relative to the total mass of the vegetable oils and fats.

[0036] The liquid detergent of the present invention can be scented with essential oils, if necessary. Essential oils include floral, citrus, herbal, woody, spice, resinous, and exotic essential oils, and it is desirable to use them according to the intended purpose. These oils may also be mixed. Examples of floral essential oils include lavender, geranium, neroli, palmarosa, Roman chamomile, and mimosa. Examples of citrus essential oils include lemon, melissa, citronella, lemongrass, sweet orange, mandarin, bergamot, grapefruit, yuzu, lime, and bitter orange. Examples of herbal essential oils include clary sage, sweet marjoram, fennel, spearmint, peppermint, lemon tea tree, basil, peppermint, and rosemary. Examples of woody oils include Kuromoji, Todomatsu, Hinoki, Japanese Cedar, Hiba, Eucalyptus Radiata, Eucalyptus Citriodora, Eucalyptus Globulus, Cypress, Juniper Berry, Cedarwood, Tea Tree, Petitgrain, Pine Needle, and Ho Wood. Examples of spices include cardamom, coriander, cinnamon leaf, ginger, and black pepper. Examples of resins include elemi, frankincense, benzoin, and myrrh. Examples of exotic oils include ylang-ylang, sandalwood, patchouli, palmarosa, and peper. It is desirable for the amount of essential oil to be less than 5% by weight of the total weight of the liquid cleanser.

[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 predetermined components that has been prepared in advance, and the mixture is thoroughly stirred to dissolve the alkaline raw material in the hot spring water. Then, in step 3, alcohol is uniformly mixed 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 the mixture is 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 produced by these steps. [Example]

[0038] The present example 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 15g palm oil Water: 100g of room temperature hot spring water A (simple alkaline hot spring) Main components of Hot Spring Water A (only those above 20mval%) (cation) sodium ion 68.86mval% Calcium ion 29.99mval% (anion) sulfate ion 72.56mval% 60g absolute ethanol 29g sodium hydroxide

[0039] Using these raw materials, a liquid detergent was produced according to the following procedure. Step 1. Heat the vegetable oil to 75-85°C. Step 2. Dissolve sodium hydroxide in hot spring water. Step 3. Mix the vegetable oil from Step 1 above with absolute ethanol. 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 was kept warm for at least 24 hours 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. The liquid detergent of Example 1 was produced according to these procedures.

[0040] Example 2 In Example 2, a liquid detergent was produced in the same manner as in Example 1, except that the following hot spring water B was used as a raw material instead of the 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% Bicarbonate ion 33.11mval%

[0041] Example 3 In Example 3, a liquid detergent 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 mineral spring (cation) sodium ion 92.41mval% (anion) sulfate ion 50.09mval% Chloride ions 32.78mval%

[0042] Example 4 In Example 4, a liquid detergent was produced in the same manner as in Example 1, except that the hot spring water D described below was used as a raw material instead of the 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 detergent was produced in the same manner as in Example 1, except that the following hot spring water E 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) bicarbonate ion 61.32mval% Sulfate ion 22.92mval%

[0044] Example 6 In Example 6, a liquid detergent 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) bicarbonate ion 22.61mval% Sulfate ion 46.94mval%

[0045] Example 7 In Example 7, a liquid detergent 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 used in Example 1. Hot spring water G: alkaline simple hot spring (cation) sodium ion 88.54mval% (anion) sulfate ion 63.93mval% Chloride ions 27.14mval%

[0046] Example 8 In Example 8, a liquid detergent was prepared 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] Comparison 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 hot spring water A.

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

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

[0051] Also, "millival %" represents the millivalence of one cation that makes up the hot spring water components, divided by the total millivalence 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. cleansing power, 2. foaming, and 3. moisturizing of hands. The evaluation methods for each were as follows.

[0053] 1. Cleaning 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 containers for Examples 1 to 9 and Comparative Example 1. Next, a new sponge was placed in each Tupperware container, and one tablespoon of water and one teaspoon of each of Examples 1 to 9 and Comparative Example 1 were poured onto the sponge.

[0054] "2. Foaming" was evaluated as follows. In Examples 1 to 9 and Comparative Example 1, the container was intended to be kneaded 30 times in each container, but in all cases, the foam overflowed from the container after 20 kneads. For this reason, the number of kneads was stopped at 22. Therefore, all samples 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, no chili oil remained 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 in 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, subjects washed dishes with their bare hands, and measured the moisture content of their hands before and 20 minutes after washing. Measurements were taken on the right palm to ensure uniformity of measurement. A belulu Skin Checker manufactured by Beautiful Angel Co., Ltd. was used to measure the moisture content. The subjects had sensitive skin, so sensitive that their hands would crack in winter.

[0058] When the result was the same as that of Comparative Example 1, it was evaluated as "△", and when it was better than that of Comparative Example 1, 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 detergency and foaming power as Comparative Example 1, but significantly improved hand moisture. Specifically, Comparative Example 1 showed a 5% decrease in moisture after dishwashing compared to before dishwashing. On the other hand, Examples 1 to 9 all showed a 3 to 10% increase in moisture after dishwashing compared to before dishwashing.

[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 high detergency, dishes were washed with bare hands using each detergent, and the moisture and oil content of the hands were measured before washing the dishes and 20 minutes after washing the dishes. Measurements were taken on the right palm to ensure that the measurement points were the same.

[0062] The detergency, foaming, foam rinsing, and amount of foam remaining in the drain after rinsing are shown in Table 3. The condition of the hands after using Example 1 is shown in Figure 1, the condition of the hands after using Comparative Example 2 is shown in Figure 2, and the condition of the hands after using Comparative Example 3 is shown in Figure 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. 100% of the respondents from Comparative Examples 2 and 3 answered that their hands felt "moist."

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

[0066] Figure 4 shows 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 detergent of Example 1 and Comparative Example 2 were dropped onto the sponge.

[0068] Figure 6 shows a photograph taken after kneading 30 times in each container, but in Example 1, the foam began to overflow from the container after 20 kneads, so the number of kneads was stopped at 22. In Comparative Example 2, the foam did not overflow from the container 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 tendency to bounce back against the fingers that touched it.

[0069] Figure 7 is a photograph showing the cleaning power of the containers of Example 1 and Comparative Example 2, which were not scrubbed with a sponge but simply washed off with running water. The container of Comparative Example 2 had residual chili oil both in appearance and to the touch, with residual chili oil remaining all over. The container of Example 1 had no residual chili oil even in the corners, and the entire container felt squeaky.

[0070] Figure 8 shows photographs of the state of the sponges 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 less chili oil on the sponge than Comparative Example 2. In Example 1, no chili oil remained in the Tupperware even after the foam inside the Tupperware was washed away with running water, suggesting 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 removing stove stains and burnt-on food, but the present invention can be used without distinction for both 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, School Health Education Division.

[0072] [Table 4]

[0073] Commercially available liquid dishwashing detergents are predominantly neutral due to concerns about rough hands, while alkaline detergents, worn with gloves, are often used to remove grease and tea stains from stovetops. The liquid detergent of the present invention is weakly alkaline, but its characteristic feature is that the cleaning ingredients do not remain on the skin. Furthermore, hot spring water, depending on its hot spring ingredients and composition, is said to have moisturizing effects, support collagen production, improve blood circulation, prevent skin dryness, refine skin texture, increase skin elasticity and soften the skin, and provide anti-aging effects by hydrating the skin and giving it firmness and moisture. These effects, combined with other factors, are thought to reduce the risk of rough hands. However, because no two hot spring waters are identical, it is difficult to determine the specific ingredients or compositions, or the types and amounts of chemical components that contribute to these effects, and the sheer volume of available information makes it difficult to make any specific comments at this time.

[0074] This liquid detergent is gentle on the hands and skin, so it can be used without rubber gloves 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 is thought that the cleaning power will be inferior to detergents 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 enhanced.

[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 dissolution, leaving foam in the drain, requiring the use of large amounts of water and time-consuming washing. However, the liquid detergent of the present invention has weak chemical bonds and quickly loses its surfactant properties when it comes into contact with calcium ions and magnesium ions contained in tap water. This allows for easy foam dissolution during rinsing, resulting in shorter washing times and less water usage, making it an environmentally friendly detergent. Furthermore, testing at an analytical center has shown that the present invention is readily biodegradable by microorganisms, making it an environmentally friendly invention in terms of biodegradability.

[0079] Commercially available cleansers contain many petroleum-based synthetic 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 it to swell (the volume of the stratum corneum increases as the surfactant solution penetrates). This disrupts the lamellar structure (in the stratum corneum, ceramides and other molecules are connected to each other and layered alternately with layers of water, with intercellular lipids filling the spaces between the stratum corneum cells), weakening the skin's barrier function and making it more susceptible to external stimuli and prone 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. This ultimately affects turnover (the regeneration of the stratum corneum).

[0080] Especially in winter, people often wash dishes with hot water. Hot water dissolves sebum, which not only washes away dirt from dishes, but also the sebum itself, which, combined with petroleum-based surfactants, can often cause serious hand skin problems. It also disrupts the balanced state of the resident bacteria that protects the skin, 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, since hot spring water is used as an ingredient in the present invention, combined with the beneficial effects of hot spring water on the skin, it is believed that the hands will be left moisturized after use.

[0082] Since hot spring water is used as a raw material in the present invention, the barrier function of the skin of the hands is enhanced 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 weak chemical bond, which allows it to quickly lose its surfactant activity upon contact with calcium and magnesium ions contained in tap water. These characteristics offer the advantages of easy foam removal, minimal surfactant residue on the skin, and relatively minimal skin irritation. Petroleum-based synthetic surfactants retain their surfactant activity even when diluted with water, and if not rinsed thoroughly, the cleansing ingredients remain on the skin. If the surfactant remains for a long time, it can weaken the skin's barrier function and cause skin problems. While typical petroleum-based synthetic surfactants retain their effectiveness even after being poured down the drain and some are resistant to decomposition in the natural environment, the liquid detergent of the present invention loses its surfactant activity when diluted with water. Furthermore, because it is an organic substance, it is more easily decomposed in the natural environment. Because the present invention is made from fatty acid salts made from vegetable oil and hot spring water, it is less likely to wash away intercellular lipids necessary for the skin's barrier function than petroleum-based synthetic surfactants. Furthermore, because hot spring water is used as an ingredient in the present invention, the beneficial effects of hot spring water on the skin are combined to leave hands feeling moisturized after use. While fatty acid salt liquid detergents are said to have weak cleaning power unless used in large quantities, this invention provides high-density, abundant foam, resulting in strong cleaning power. Because it is weakly alkaline, it can also be used to wash dishes and remove acidic stains such as burnt food and tea stains. Since 80% of household dirt is said to be acidic, this detergent has a wide range of uses. [Industrial Applicability]

[0084] Kitchen: Washing dishes, removing oil stains from the ventilation fan, stove, grill, and walls, removing burnt food from the stove and grill, and removing slime from the sink and drain. - Bathroom: Removes slime, dirt from mirrors, sebum 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 wash including scalp

Claims

1. A liquid cleaning agent comprising a fatty acid salt and hot spring water having a total weight of hydrogen sulfide ions, thiosulfate ions, and free hydrogen sulfide of 2 mg / kg or less, The ratio of the hot spring water in the liquid cleaning agent is 10 to 85 mass %, The liquid detergent contains 20% by weight or more of oleic acid, 3% by weight or more of lauric acid, and 3% by weight or more of myristic acid relative to the total amount of fatty acids constituting the fatty acid salt.

2. The liquid cleaning agent of claim 1 , wherein the liquid cleaning agent is for use in household products.

3. The liquid detergent according to claim 1, wherein the liquid detergent is for dishwashing.

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