CN112940872A

CN112940872A - Solid detergent

Info

Publication number: CN112940872A
Application number: CN201911265929.6A
Authority: CN
Inventors: 姜昇材; 郑大韩
Original assignee: Kevin Orchard Co ltd
Current assignee: Kevin Orchard Co ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2021-06-11

Abstract

The present invention provides a solid detergent for tabletting a mixture comprising: 20-40 wt% sodium lauryl sulfoacetate powder, 50-70 wt% sugar powder and 1-10 wt% sodium bicarbonate powder, wherein the sugar powder comprises dextrose and sucrose powder.

Description

Solid detergent

Technical Field

The present invention relates to a solid detergent which is excellent in environmental friendliness and has improved disintegrability and detergency.

Background

Surfactants have hydrophobic and hydrophilic groups that can lower the surface tension of liquids, and are therefore well mixed and dissolved in oils and water, an essential ingredient for making soaps, synthetic detergents or cosmetics. The expression surfactant includes natural surfactants and synthetic surfactants, and the synthetic surfactants have the advantages of low cost and strong detergency, so that the synthetic surfactants are mostly used in daily life.

However, synthetic surfactants not only remove pollutants but also weaken the skin due to their strong detergency, reducing the skin barrier function. Therefore, it is easy to permeate foreign substances into the skin, and the moisture in the skin is easily evaporated, thereby accelerating the skin drying and wrinkle formation, and accelerating aging.

In addition, since a detergent prepared by using a synthetic surfactant is not subjected to a stability test, it is easily exposed to potential hazards by adding a builder, a preservative, an artificial perfume, and the like to the detergent, which are designated as inducing substances inducing various skin allergies, dermatitis, and the like, and improving the functions of the detergent. That is, products containing synthetic surfactants focus only on the function of removing contaminants and do not consider the aspects of skin health and environmental protection at all.

In order to improve the disadvantages of the expression of the active agent as described above, products containing natural surfactants are recently being demanded and developed. However, natural surfactants are easily affected by the external environment and thus are difficult to store, and further, they are expensive and have a small amount of foam compared to synthetic surfactants, and thus are difficult to stimulate the purchasing power of customers.

On the other hand, kitchen detergents are generally used in liquid form, but liquid kitchen detergents are heavy and are not easy to carry and store. Further, such a liquid kitchen detergent is generally used for cleaning tools or objects at once before a general cleaning operation, and at this time, most of the added detergent is exhausted at the initial stage of the cleaning operation, so that there is a problem that it is difficult to continuously maintain detergency throughout the entire cleaning operation, and if the number of times of using the detergent is increased during the cleaning period in order to continuously maintain detergency, the detergent more than necessary is used, so that it is disadvantageous in economical efficiency and environmental protection.

In addition, kitchen detergents directly contact the skin of a user during use, and thus remain on the skin after use, which may cause skin diseases; if left in the dishware, such cleaning ingredients can directly enter the mouth of the user, which can adversely affect health and hygiene.

Accordingly, a solid type kitchen detergent has been developed, but in the case of the solid type, since it is exposed to the external environment until it is consumed after use, bacteria are easily proliferated, and sanitary management is difficult. In addition, the solid type kitchen detergent shrinks with use, causing inconvenience to the user in generating the foam.

Therefore, development of a solid detergent containing a natural surfactant, which is excellent in environmental friendliness and also has improved disintegrability and detergency has been demanded.

Disclosure of Invention

In order to solve the above-mentioned problems of the prior art, the present invention provides a solid detergent which is excellent in environmental friendliness and also improved in disintegrability and detergency.

According to an aspect of the present invention, there is provided a solid detergent obtained by tabletting a mixture comprising: 20 to 40 wt% sodium lauryl sulfoacetate powder, 50 to 70 wt% sugar powder and 1 to 10 wt% sodium bicarbonate powder;

in an embodiment, the water content of the mixture may be 6% by weight or less.

In one embodiment, the sugar powder may comprise dextrose (dextrose) powder.

In one embodiment, the sugar powder may further comprise sucrose (sucrose) powder.

In one embodiment, the content of the sucrose powder in the sugar powder may be 20 to 80 wt%.

In one embodiment, the sucrose powder may be porous particles.

In one embodiment, the porosity of the porous particles may be 20 to 80 vol%.

In one embodiment, the mixture may have an apparent density of 0.5 to 1.5g/㏄; the apparent density of the solid detergent can be 1.51-3.0 g/㏄.

In one embodiment, the solid detergent may have a diameter of 7 to 30 mm.

The solid detergent according to an aspect of the present invention contains sugar powder in a natural surfactant, and thus can improve detergency while improving environmental friendliness. In particular, the mixture mixed in a powder state can be tabletted into a tablet shape without a binder, and thus, disintegration can be improved upon washing, and foaming can be easily generated to improve cleaning power.

In addition, the solid detergent is easily stored by tabletting into a tablet shape, and can be prevented from being used more than a liquid detergent, so that environmental protection and economical efficiency can be realized.

The effects of the present invention are not limited to the above-described effects, and should be understood to include all effects that can be presumed from the detailed description of the present invention or the structure of the present invention recited in the claims.

Drawings

FIG. 1 is a graph showing the particle size distribution of sodium lauryl sulfoacetate powder according to an embodiment of the present invention;

FIG. 2 is a particle size distribution curve for dextrose powder according to an embodiment of the invention;

FIG. 3 is a particle size distribution curve of sodium bicarbonate powder according to an embodiment of the present invention;

FIG. 4 is a measurement of the apparent density of a powder mixture according to an embodiment of the invention;

fig. 5 is a measurement result of apparent density of a solid detergent according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In addition, throughout the specification, when a part "includes" a certain component, it means that other components may be included unless otherwise specified, and the other components are not excluded.

According to an aspect of the present invention, there is provided a solid detergent prepared by tabletting a mixture comprising 20 to 40% by weight of sodium lauryl sulfoacetate powder, 50 to 70% by weight of sugar powder and 1 to 10% by weight of sodium bicarbonate powder into a tablet shape.

Generally, a detergent contains a surfactant to be dissolved in water, thereby performing an oil stain removing effect. Surface refers to the interface where gas and liquid, liquid and solid contact each other; the surfactant has a hydrophilic group on one side of the molecule and a hydrophobic group on the opposite side, and thus can lower the surface tension of the interface, thereby acting to relax the boundary of the interface.

When the concentration of the surfactant molecules is not less than a predetermined concentration at the time of washing, micelles (micelles) in which hydrophobic groups are on the inner side and hydrophilic groups are on the outer side can be formed. The hydrophobic groups aggregated in the micelle can absorb oil stains polluting the cleaning object into the micelle, so that the oil stains can be removed by water during washing.

Typical examples of the conventional detergent include synthetic surfactants which are inexpensive and excellent in detergency, and sulfates are widely used, such as Sodium Lauryl Sulfate (Sodium Lauryl Sulfate), Sodium Laureth Sulfate (Sodium Laureth Sulfate), ammonium Laureth Sulfate (Sodium Laureth Sulfate), and ammonium Laureth Sulfate (Sodium Laureth Sulfate).

The sulfate-based surfactant is low in price, is less affected by the external environment, and is excellent in detergency. However, if the sulfate-based products are used for a long time, 1, 4-dioxin produced in the body may be accumulated as carcinogenic substances, thereby causing various skin diseases and dysfunctions.

Accordingly, the solid detergent contains a natural surfactant, realizes environmental protection and skin protection effects, and contains sugar powder and sodium bicarbonate powder, thereby improving detergency.

The solid detergent may comprise sodium lauryl sulfoacetate powder. The Sodium Lauryl Sulfoacetate (Sodium Lauryl Sulfoacetate) is an anionic natural surfactant derived from coconut, has low skin irritation, abundant foam and excellent detergency, and is therefore suitable for bubble bath agents, shampoos, cleansing products, and the like.

In particular, the Skin depth Score (Skin Deep Score) was 1 according to the EWG scale, and thus the Skin stability was very excellent. In addition, when mixed with other surfactants, the composition can maintain a stable texture, and thus can be applied to various products.

The term "EWG" rating as used in this specification is the cosmetic ingredient hazard rating issued by the American non-profit Environmental citizen organization known as EWG (Environmental Working Group); more specifically, the EWG classifies the component damage degree into 1 to 10 grades by adjusting the damage of the cosmetic components in a comprehensive manner, and classifies the 1 and 2 grades as safety grades.

On the other hand, the content of the sodium lauryl sulfoacetate powder may be 20 to 40 wt% based on the total weight of the solid detergent. If the sodium lauryl sulfoacetate powder content is less than 20 wt%, the cleaning power can be reduced; if it exceeds 40% by weight, the moisturizing ability can be reduced.

The solid detergent may comprise a sugar powder. The sugar powder may be one selected from the group consisting of monosaccharides (monosaccharides), disaccharides (disaccharides) and combinations thereof, and is preferably glucose (glucose) powder, and more preferably dextrose (dextrose) powder.

The monosaccharide is a basic unit of carbohydrate composed of one kind of sugar that is not hydrolyzed by acid, alkali, enzyme, or the like, and is anhydrous crystalline, has water solubility, and is insoluble in diethyl ether, ethanol, or the like. The monosaccharides are classified according to the number of carbons, and the monosaccharides most present in nature are hexoses, and the types thereof include glucose, fructose, and galactose.

The disaccharide is formed by combining two monosaccharides, and the types of the disaccharide are sucrose, maltose and lactose. A mixed mixture of these, i.e. polysaccharides (polysaccharides), can be formed in combination with a plurality of monosaccharides in a form that is made when the animal or plant stores energy or when a structure is formed. The polysaccharides can be classified into digestible powder, glycogen and indigestible cellulose.

The content of the sugar powder may be 50 to 70 wt% based on the total weight of the solid detergent. If the content of the sugar powder is less than 50 wt%, the cleaning power may be reduced; if it exceeds 70 wt%, the required amount is exceeded, and therefore no more excellent effect is achieved.

On the other hand, the sugar powder is dissolved in water during cleaning, and pollutants are adhered and removed by sugar molecules, so that the effect of improving the cleaning effect can be realized with the sodium lauryl sulfoacetate powder, and the cleaning force can be maximized. In addition, the sugar powder is decomposed by microorganisms after cleaning, so that it is excellent in environmental friendliness and can achieve the effect of protecting the skin of a user. Since the sugar powder is a monosaccharide, it has high solubility and reactivity, and therefore, the sugar powder is a monosaccharide, and preferably may be a glucose powder.

The glucose is produced by the hydrolysis of corn starch by heat, acid and enzymes, commonly referred to as glucose, and exists in the shape of a hexagonal ring having aldehyde groups. The glucose exists in two optical isomers of D-form and L-form, and is mostly D-glucose in a natural state, while L-glucose does not exist in a natural state, and the manufacturing method is very complicated. Therefore, when L-glucose is used in a detergent, the production cost can be increased. Thus, the sugar powder may be a D-glucose powder. I.e. dextrose (dextrose) powder.

The solid detergent may comprise sodium bicarbonate powder. The sodium bicarbonate adjusts the pH of the solid detergent to be in the range of 7.0-8.0, so that the effect of protecting the skin of a user can be realized while preventing the re-contamination of a cleaning object, and the cleaning power can be improved together with the sodium lauryl sulfoacetate and the sugar powder. In addition, the sodium bicarbonate absorbs moisture contained in other powders such as sugar powder during the mixing and tableting of the powders for manufacturing the solid detergent to combine the powders with each other, thereby improving the structure and shape stability of the solid detergent, imparting gloss of a desired level to a cleaning object, and providing visual satisfaction to a user.

The content of the sodium bicarbonate may be 1 to 10% by weight based on the total weight of the solid detergent. If the content of the sodium bicarbonate is less than 1 wt%, the cleaning power may be reduced; if it is more than 10% by weight, the skin of the user may be damaged.

The solid detergent may be a mixture containing sodium lauryl sulfoacetate powder, sugar powder and sodium bicarbonate powder, and the mixture may be tabletted into tablet shape, and the water content of the mixture is less than 6 wt%, preferably 0 wt% or more and 6 wt% or less. The term "moisture content" as used in this specification is the weight of moisture in percent for the total weight of the particular substance containing moisture. For example, the moisture content of a mixture containing moisture refers to the percentage by weight of moisture relative to the total weight of the mixture.

If the water content of the mixture is more than 6 wt%, the processability of the mixture and the structure and shape stability of the solid detergent can be reduced; if the mixture does not actually contain moisture, it is difficult to tablet the mixture into a solid detergent of a predetermined shape due to friction between powders.

In the case of the existing solid detergent, a binder for improving the binding force between powders is used alone, but such a binder not only reduces the disintegratability of the solid detergent but also is inherently water-insoluble, and thus the cleaning power can be reduced even if it is used in a small amount, and thus it is not environmentally friendly.

The powder constituting the solid detergent, such as sugar powder, may contain a predetermined amount of moisture, whereby the water content of the solid detergent may also be adjusted within a predetermined range. As described above, the sodium bicarbonate powder absorbs the moisture during the mixing and tableting processes of the powder for manufacturing the solid detergent to combine the powders with each other, thereby improving structural and shape stability.

Fig. 1 to 3 are particle size distribution curves of sodium lauryl sulfoacetate powder, dextrose powder, and sodium bicarbonate powder, respectively, according to an embodiment of the present invention.

The particle size of each powder, along with the moisture content, is an important factor in the processing (i.e., tableting) of the powder. If the particle size of the powder is too large, the disintegration speed is reduced, and the generation of bubbles and the cleaning force can be reduced; if the particle size of the powder is too small, unnecessary agglomeration between the powders occurs, and the workability may be lowered.

Referring to fig. 1, the sodium lauryl sulfoacetate powder may have an average particle size of 40 to 80 μm. If the average particle size of the sodium lauryl sulfoacetate powder is less than 40 μm, processability may be reduced; if it exceeds 80 μm, the disintegrability and detergency can be reduced.

Referring to fig. 2, the average particle size of the glucose powder may be 70 to 130 μm. If the average particle size of the glucose powder is less than 70 μm, processability may be reduced; if it exceeds 130 μm, the disintegrability and cleaning power can be reduced.

Referring to fig. 3, the sodium bicarbonate powder may have an average particle size of 60 to 120 μm. If the average particle size of the sodium bicarbonate powder is less than 60 μm, the workability may be reduced; if it exceeds 120 μm, the disintegrability and detergency can be reduced.

In another aspect, the sugar powder may further comprise sucrose (sucrose) powder. The sucrose is prepared by combining glucose and fructose, and can also be called sucrose or white sugar. The sucrose is a natural sweetener made by purifying raw sugar obtained from sugar cane or sugar beet. Specifically, liquid sugar is extracted from sugar cane stems or sugar beet roots, the sugar solution is boiled, filtered, and crystallized after removing impurities.

The sucrose powder has substantially the same action effect as the dextrose powder and can therefore be substituted for a portion of the glucose powder, for example, the content of the dextrose powder is 20 wt% or more, preferably 50 wt% or more, which can improve the environmental friendliness of the solid detergent. Preferably, the content of the sucrose powder in the sugar powder may be 20 to 80 wt%. If the content of the sucrose powder is less than 20 wt%, foaming and cleaning power can be reduced; if it is more than 80 wt%, the durability of the solid detergent may be reduced.

The sucrose powder is dissolved in water during cleaning, contaminants are adhered and removed by sucrose molecules, and the sucrose powder and the sodium lauryl sulfoacetate realize a lifting effect and can maximize cleaning force. In addition, the sucrose powder is decomposed by microorganisms after cleaning, so that it is excellent in environmental friendliness and can achieve the effect of protecting the skin of a user.

The sucrose powder may be porous granules. The pores of the sucrose powder induce bubble formation, thereby forming abundant foam, which can improve the detergency of the solid detergent.

The porosity of the porous particles may be 20 to 80 vol%. If the porosity of the porous particles is less than 20 vol%, foam formation and cleaning power can be reduced; if it exceeds 80 vol%, the durability of the solid detergent may be reduced.

In another aspect, the mixture has an apparent density of 0.5 to 1.5g/㏄, and the solid detergent may have an apparent density of 1.51 to 3.0g/㏄.

The term "apparent density" as used in this specification is meant to include both particles and the spatially calculated density between particles. For example, a higher apparent density of tabletted solid detergents means that there is no spatially dense binding. That is, it means that the larger the apparent density, the larger the bonding force.

In the invention, the mixture is formed by mixing sodium lauryl sulfoacetate powder, sugar powder and sodium bicarbonate powder, and the solid detergent is formed by tabletting the mixture through a tabletting machine, so that the binding force among the powders can be improved. That is, the mixture may be subjected to a tableting process while increasing the apparent density.

If the apparent density of the mixture is less than 0.5g/㏄, the durability of the solid detergent may be reduced; if it exceeds 1.5g/㏄, the cleaning power can be reduced. In addition, if the apparent density of the solid detergent is less than 1.51g/㏄, the durability of the solid detergent may be reduced; if it exceeds 3.0g/㏄, the cleaning power can be reduced.

On the other hand, the solid detergent may further comprise plant essential oils, as required. The plant essential oil is a liquid extracted and concentrated from stems, leaves, flowers, roots, etc. of plants, can emit fragrance when added to the solid detergent, and has different effects according to kinds, so that the kind of the plant essential oil can be selected according to desired fragrance and effect in the present invention.

Specifically, the plant essential oil may be one selected from the group consisting of Eucalyptus (Eucalyptus), Peppermint (Peppermint), Lemongrass (Lemongrass), Palmarosa (Palmarosa), Lavender (Lavender), Chamomile (Chamomile), tea tree (tea tree), and a mixture of two or more thereof, but is not limited thereto.

The solid detergent can be made into cylindrical shape and coin shape. At this time, the solid detergent is adjusted to have a diameter within a range of 7 to 30 mm, and can be individually packaged. If the diameter of the solid detergent is less than 7 mm, the size of the detergent is too small, which may reduce processability and cleaning duration; if it is greater than 30 mm, the foam formation and cleansing power can be reduced.

The solid detergent adjusted in the range may have an amount required for cleaning more than once, and thus, is convenient to carry and keep, and is exposed to the outside for a short time, and thus, may be hygienically managed.

The individual package is composed of a safety cap including an inner cap and an outer cap, and can be easily opened by a predetermined external force, but is difficult to open by a child or a child, and thus has excellent safety.

Hereinafter, examples of the present invention will be described in detail.

Example 1

A mixture with a water content adjusted to 5 wt% was prepared by mixing 35 wt% of sodium lauryl sulfoacetate powder with an average particle size of about 61.18 μm, 60 wt% of aqueous dextrose powder with an average particle size of about 113.11 μm, and 5 wt% of sodium bicarbonate powder with an average particle size of about 109.86 μm. The mixture was compressed at a pressure of 10ton using a tablet press to produce a coin-shaped solid detergent having a diameter of 30 mm and a height of 5 mm.

Example 2

A solid detergent was produced in the same manner as in example 1 except that a mixture having a water content of 4% was prepared by adjusting the contents of the respective powders to 40% by weight of sodium lauryl sulfoacetate powder, 50% by weight of aqueous dextrose powder and 10% by weight of sodium bicarbonate powder.

Example 3

A solid detergent was produced in the same manner as in example 1 except that a mixture having a water content of 6% was prepared by adjusting the contents of the respective powders to 27% by weight of sodium lauryl sulfoacetate powder, 70% by weight of aqueous dextrose powder, and 3% by weight of sodium bicarbonate powder.

Example 4

A solid detergent was produced in the same manner as in example 1, except that 50% by weight of sucrose powder having a void volume of 50% by volume based on the total weight of the comparative dextrose-containing powder was further included, and a mixture having a water content of 3% was produced.

Comparative example 1

A solid detergent was produced in the same manner as in example 1 except that a mixture having a water content of 3.8% was prepared by adjusting the contents of the respective powders to 45% by weight of sodium lauryl sulfoacetate powder, 45% by weight of aqueous dextrose powder and 10% by weight of sodium bicarbonate powder.

Comparative example 2

A solid detergent was produced in the same manner as in example 1, except that a mixture having a water content of 7% was prepared by adjusting the content of each powder to 20% by weight of sodium lauryl sulfoacetate powder, 75% by weight of aqueous dextrose powder, and 5% by weight of sodium bicarbonate powder.

Comparative example 3

A solid detergent was produced in the same manner as in example 1 except that a mixture having a water content of 0% was produced by including 60% by weight of anhydrous dextrose powder instead of the aqueous dextrose powder.

Comparative example 4

A solid detergent was produced in the same manner as in example 1, except that a mixture having a water content of 5% was prepared by adjusting the contents of the respective powders to 39.5% by weight of sodium lauryl sulfoacetate powder, 60% by weight of aqueous dextrose powder, and 0.5% by weight of sodium bicarbonate powder.

Comparative example 5

A solid detergent was produced in the same manner as in example 1, except that a mixture having a water content of 5% was prepared by adjusting the contents of the respective powders to 29% by weight of sodium lauryl sulfoacetate powder, 60% by weight of aqueous dextrose powder, and 11% by weight of sodium bicarbonate powder.

Experimental example 1: apparent density of detergent

Fig. 4 and 5 are the results of apparent density measurement of the powder mixture and the solid detergent of example 1, respectively. Referring to FIGS. 4 and 5, the apparent densities of the powder mixture and the solid detergent of example 1 were measured five times, and the average values were 1.4936g/cc and 1.5182g/cc, respectively, and the powders were combined with each other by tableting while reducing the void volume between the powders, showing an increase in the apparent density, and particularly, the apparent density of 1.5g/cc was defined as the limit, and a stable structure and shape of the solid detergent was realized at values above.

Experimental example 2: evaluation of detergent Performance

(Table 1)

(excellent relative evaluation criteria:. good. DELTA. general. x. poor)

Referring to table 1 above, the case of the solid detergent produced from the mixture containing sodium lauryl sulfoacetate powder, aqueous dextrose powder, and sodium bicarbonate powder and having a water content of 5% (example 1) was excellent in all performance evaluations (degree of foam formation, disintegratability, detergency, durability, usability).

In addition, in the case of solid detergents prepared from mixtures in which the content of aqueous dextrose powder was adjusted to adjust the water content to 4% and 6%, respectively (examples 2 and 3), there was a slight difference, but the performance was excellent or good in all performance evaluations; the case of adding sucrose powder to produce a solid detergent (example 4) is excellent in all the performance evaluations as in example 1; in particular, an excellent cleaning power of the solid detergent can be expected by the enhancing effect with other powders.

Conversely, in the case of too little or too much solid detergent containing aqueous dextrose powder (comparative examples 1, 2), the structure of the solid detergent is reduced, the shape stability is reduced, and finally the durability and the practicability are reduced; in particular, solid detergents made from mixtures having a water content of 7% are prone to collapse, and therefore difficult to form and maintain foam, and therefore poor in durability and usability.

In addition, in the case of a solid detergent comprising anhydrous dextrose powder as a powdered sugar, and thus made of a mixture having a water content of 0% (example 3), the binding and binding retention between the respective powders were reduced, and therefore, it was inferior in all performance evaluations.

On the other hand, in the case where the content of the sodium bicarbonate powder is too small or too much contained (comparative examples 4 and 5), the mutual bonding force of the respective powders can be reduced, and therefore, all the performance evaluations are degraded, and particularly, the durability and the usability are poor.

Experimental example 3: evaluation of skin protective Properties of detergents

The skin protective properties of the solid detergents of the examples were evaluated as follows.

In order to evaluate the skin protective properties of the solid detergent according to the surfactant involved in skin damage, a solid detergent comprising the solid detergent of example 1 was used as an experimental group and a solid detergent comprising an existing sulfate-based surfactant was used as a control group for conducting experiments.

For the experiment, ten animals (rabbits) were used as the subjects, and the health status of all the individuals was checked visually before entering the experiment, and healthy individuals were put into the experiment through a quarantine and decontamination period of eight days.

The back of ten subjects was shaved, and two treatment regions and two control regions each having a width of 2.5cm × 2.5cm were divided into a friction region and a non-friction region before treatment, and the friction region was scratched to such an extent that only the epidermis was damaged and the dermis was not damaged.

For ten subjects, 0.5mL of gauze impregnated with the solid detergent of example 1 was attached to the treatment area (rubbing area 1, non-rubbing area 1); for ten test subjects, gauze immersed in 0.5mL of a sulfate-based solid detergent was attached to the control area (rubbing part 1, non-rubbing part 1), and then the gauze was fixed with a non-irritating tape and an elastic bandage to prevent the gauze from falling off. After 24 hours had elapsed, gauze was removed to clean the material remaining on the skin.

Erythema, edema, skin irritation index (p.i. i, Primary irritation index) were evaluated after 72 hours for the subjects. In this case, the evaluation criteria and the evaluation results are shown in tables 2 and 3 below, respectively.

(Table 2)

(Table 3)

Referring to table 3 above, in the case where sodium lauryl sulfoacetate was included as a natural surfactant (example 1), erythema and edema were not formed, and the skin irritation index was also 0.3, so that the skin protection effect was excellent. In contrast, in the case of a detergent containing a sulfate-type synthetic surfactant, erythema and edema were formed, and the skin irritation index was 4.2, causing moderate irritation to the skin.

The present invention described above is for illustration, and those having ordinary knowledge in the art to which the present invention pertains should understand that it can be easily deformed into other specific shapes without changing the technical idea or essential features of the present invention. The embodiments described above are therefore to be considered in all respects as illustrative and not restrictive. For example, each component described in the singular may be implemented in a distributed manner, and similarly, components described in the distributed manner may be implemented in a combined manner.

The scope of the present invention is indicated by the appended claims, and all changes and modifications that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

Claims

1. A solid detergent characterized in that,

compressing a mixture into a tablet shape, the mixture comprising:

20 to 40 wt% sodium lauryl sulfoacetate powder, 50 to 70 wt% sugar powder and 1 to 10 wt% sodium bicarbonate powder;

wherein the sugar powder comprises dextrose and sucrose powder.

2. A solid detergent according to claim 1,

the water content of the mixture is 6% by weight or less.

3. A solid detergent according to claim 1,

the content of the sucrose powder in the sugar powder is 20-80 wt%.

4. A solid detergent according to claim 1,

the sucrose powder is a porous granule.

5. A solid detergent according to claim 4,

the porosity of the porous particles is 20 to 80 vol%.

6. A solid detergent according to claim 1,

the apparent density of the mixture is 0.5-1.5 g/㏄;

the apparent density of the solid detergent is 1.51-3.0 g/㏄.

7. A solid detergent according to claim 1,

the diameter of the solid detergent is 7-30 mm.