JPH083597A - Washing powdery soap powder readily soluble in cold water and liquid soap - Google Patents

Abstract

PURPOSE:To obtain laundry soap powder easily soluble in cold water and liquid soap not precipitating by washing with cold water. CONSTITUTION:This laundry soap powder easily soluble in cold water is obtained by mixing 55-90wt.% of sodium oleate as sodium salt of a fatty acid of a simple substance with 8-40wt.% of sodium carbonate and 2-10wt.% of an organic acid salt. This liquid soap not precipitating by washing with cold water is prepared by blending 55-90wt.% of potassium oleate as potassium salt of a fatty acid of a simple substance with 8-40wt.% of potassium carbonate and 2-10wt.% of an organic acid salt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laundry powder soap which is easily dissolved in cold water and a liquid soap which does not cause soap to be deposited by washing with cold water.

The object of the present invention is to improve the usability of powder soap by producing a laundry powder soap which dissolves quickly even in cold water, does not remain undissolved, and can be rinsed in a short time. It is an object of the present invention to provide a powdered soap which is excellent in safety and has good texture of clothes after washing.

Another object of the present invention is to provide a liquid soap in which deposition of difficult and insoluble soap is eliminated by washing in cold water.

In the field of household laundry detergents, the soap movement is strong, but due to the permeation of the fact that there are many undissolved residues and the convenience of synthetic detergents, the results are not so great. With the advent of easy-to-use powdered soaps and liquid soaps, it is expected that the number of users will increase and eventually contribute to environmental problems (water pollution).

[0005] Compared with the current method for producing soap by directly saponifying fats and oils (rice bran oil, olive oil, etc.), the method of neutralization and saponification using decomposed fatty acid as a raw material raises the raw material cost, but in a short time. Since the saponification is completed and no expert is required, it is possible to reduce the overall cost, which leads to the activation of the soap industry, which is hitting the wall from the side of industrial prosperity.

The present invention is an ideal substance in which the ingredients blended in powder soaps and liquid soaps are excellent in biodegradability, producing raw materials in the primary industry and completely decomposing after the products are used and returning naturally. Since it is possible to realize a cycle, it will be an epoch-making product that meets the necessary conditions as a product that is totally discharged from domestic wastewater.

[0007]

2. Description of the Related Art Conventional soap is produced by directly saponifying fats and oils such as rice bran and olives, or by neutralizing and saponifying fatty acids (called direct fatty acids) obtained by hydrolyzing fats and oils,
It was manufactured by adding sodium carbonate as a builder.

For this reason, in the conventional soap powder, the complex fatty acid is present in the raw material oil, and as a result, sodium stearate (40 to 50 ° C.) having a property of being hardly soluble in cold water is obtained.
Soluble to some degree), and sodium palmitate (35
Necessarily melts).

Further, in the conventional liquid soap, the raw material oil contains complex fatty acids, and as a result, potassium stearate and potassium palmitate are inevitably present, and when washed with cold water, It may react with sodium such as sodium chloride, which is a stain component, and precipitate as sodium stearate or sodium palmitate.

Conventionally, there has been no product produced by using laundry fatty acid as a simple substance. In the case of powdered soap, as the saturated fatty acid sodium that is easily soluble, there are fatty acids having 12 or less carbon atoms such as sodium laurate, but it is unsuitable because it has poor detergency. Sodium unsaturated fatty acid such as sodium oleate is a soft soft soap. Sodium linoleate or sodium linolenate lacks stability as soap and has poor detergency.

Sodium oleate has good foamability and hard water resistance, and has extremely good detergency at low to medium temperatures.
It also has excellent solubility in cold water. Oleic acid itself is liquid at room temperature, and sodium oleate alone is soft and cannot be formed into solid or powder soap.

Sodium myristate is not readily soluble in cold water but is soluble and has a detergency. Sodium palmitate, which is sparingly soluble in cold water, exhibits excellent detergency at room temperature. Sodium stearate, which is insoluble in cold water, exhibits an extremely large detergency at medium to high temperatures.

As a result of a comparative test of detergency using a combination of simple fatty acid sodium and examination of hard water resistance, solubility, difficulty of processing into soap powder, etc. It was never used. Therefore, it has been common to adjust the solubility, detergency and the like by changing the composition of the oil and fat raw material.

Usually, in order to easily pulverize soap with a common water content of 20 to 30% or less in the production of powder soap, fats and oils containing a small amount of unsaturated fatty acids may be blended,
In consideration of detergency, oils and fats containing a large proportion of oleic acid, palmitic acid, etc. may be added. Further, when the solubility is important, it is advisable to add a large amount of fats and oils containing a large amount of short-chain fatty acids and fats and oils containing a large amount of unsaturated fatty acids.

It has been conventionally abandoned that sodium oleate alone cannot be used to produce powdered soap, but powdering is possible if the amount of water is sufficiently reduced and the product is crushed under cooled (about room temperature) conditions. It turned out by the inventor's experiment.

Since the production of powdered soap using sodium oleate alone has become possible by adjusting the components to be added and the amount of water, it has become possible to manufacture powdered soap which is easier to use than synthetic detergents in terms of solubility. .

Detergency of sodium oleate alone is inferior to that of conventional powdered soap, and even when sodium carbonate is mixed with sodium oleate, it is inferior to that of conventional powdered soap, resulting in poor solubility. A perfect product is not practical. Even when edetate was added as a sequestering agent, no significant improvement in detergency was observed.

[0018] In this case, even if the solubility and the prevention of soap residue are completely improved, it is not possible to satisfy the detergency, which is the original purpose of the powder soap, and the cost is increased by adding an expensive simple fatty acid. There is little merit to fill in.

In the present invention, sodium oleate 55-
By adding 2 to 10% by weight of an organic acid salt as a sequestering agent to 90% by weight and 8 to 40% by weight of sodium carbonate, the detergency was successfully improved (the water content is olein as a manufacturing condition). It depends on the blending ratio of sodium acid, and if the blending ratio is low, it should be 15% by weight or less.

The fatty acid composition of soap in which the washing power is improved by the combination of sodium carbonate and sodium citrate is found when oleic acid accounts for about 50% of the total fatty acids, and the higher the concentration of oleic acid, the more remarkable.

The powdery soap of the present invention can contain an oxygen-based bleaching agent in an appropriate amount of 1% by weight or more, and the detergency is greatly improved. The oxygen-based bleach (sold separately) can be used for washing without any problems, and the effect is excellent.

Powder soap There is a limit to the bleaching agent that can be blended with the powdery soap in order to meet the JIS standard, and it is not a product aimed at a strong bleaching effect like the products sold as bleaching agents.

Sodium oleate, which is the main component of rice bran oil, olive oil, sunflower oil, camellia oil, etc., is readily soluble in cold water, has little skin irritation, and has excellent detergency, so sodium oleate is recommended. As the main component (sodium oleate has a soft soap base, and it was thought that it would not be easy to process it into powder soap alone, but it can also be powdered alone by mixing the builder and adjusting the water content. Became).

When a small amount of sodium myristate, which is soluble in cold water, has low skin irritation, excellent detergency, hard foundation and excellent stability, is added as an accessory component, it can be pulverized relatively easily. , Stability is also improved. Since sodium myristate is less soluble in cold water than sodium oleate, it takes more time to dissolve in cold water than soap powder of sodium oleate alone.

Other than the above-mentioned two types of fatty acid sodium, sodium linoleate is well dissolved in cold water and has little skin irritation, but has a moderate detergency and a soft foundation.
It should not be blended because it has the drawback of being easily deteriorated. The main component of palm oil soap that is easily soluble in cold water, such as sodium laurate C
Soluble sodium with a fatty acid of 12 or less is excellent in solubility, but has very strong skin irritation and poor or almost no detergency, and is therefore unsuitable for blending.

Saturated fatty acid sodium having a C16 or more such as sodium palmitate and sodium stearate has a large detergency and a small skin irritation, but is poorly soluble in cold water.
Not suitable because it is insoluble.

The difficulty of dissolving the powdered soap is (a) removal of the hardly soluble component contained in the case of rice bran soap or blending only with the easily soluble component, (b) fine particle formation or granulation of the powder,
(C) The problem is solved by maintaining the dry state of the powder (preventing caking).

The rice bran soap contains soap which is hardly soluble or insoluble in cold water, and the fatty acid content ratio thereof is as follows.

Palmitic acid (C16) 17% (third most) Poorly soluble in cold water Stearic acid (C18) 2.7% (fourth most) Insoluble in cold water Others (C20-C24) 1.4% In cold water Insoluble

As described above, the rice bran powder soap contains 20% or more of the pure soap insoluble or slightly soluble component in cold water.

The oxygen-based bleaching agent can be blended only in the powder soap (water content is adjusted) thus produced. At high water content, it decomposes easily and analysis is promoted when it comes into contact with metals, so care must be taken when blending.

Regarding the bleaching agent, sodium percarbonate or sodium perborate can be added in an appropriate amount as an oxygen-based bleaching agent. The bleaching effect is not so high compared to the dedicated bleaching agent (in short washing time), but it is more effective against stains such as stains and yellowing compared to other detergents, and the bleaching agent alone gives the indicated concentration and washing. The effect is superior to the case of treating for a time (6 to 10 minutes), and the difference is remarkable under low temperature conditions (30 ° C. or lower). It also prevents black debris from sticking to the washing tub and has the effect of cleaning the drainage pipe.

For stubborn stains, it is advisable to wash them in warm water for 1-2 hours. Still, it is necessary to use a dedicated bleach for stubborn stains and yellowing that will not come off.

As for the enzyme agent, an appropriate amount such as a proteolytic enzyme which is alkaline and has an effect can be blended, but the decomposition rate is slow and takes a long time at a low temperature, and the effect is not sufficient at a low temperature due to the optimum temperature. Although there are problems and recently improved enzyme preparations have been developed, the test results show almost no effect and it is not a fundamental solution.

Considering the environment and safety, it is considered preferable not to incorporate edetic acid as a chelating agent, which is considered to have problems in cytotoxicity and biodegradation.

Example

The characteristics of the soap powder according to the present invention are that no harmful components are blended, and all the blended components are substances excellent in safety and biodegradability.

Standard type (development code OCC) basic compounding ingredients Pure soap: oleic acid soap Alkali auxiliary agent: carbonate Sequestering agent: organic acid salt

Bleach formulation type (development code OCCP)
Basic compounding ingredients of pure soap: oleic acid soap Alkali auxiliary: carbonate Sequestering agent: organic acid salt Bleach: oxygen bleach

[Formulation Example 1] Sodium oleate 60.0% Sodium carbonate 33.0% Sodium citrate 7.0% Moisture (in product) 15.0% or less

[Formulation Example 2] Sodium oleate 60.0% Sodium carbonate 32.0% Sodium citrate 5.0% Sodium percarbonate 3.0% Moisture (in product) 15.0% or less

[Formulation Example 3] Sodium oleate 55.0% Sodium myristate 0.5% Sodium carbonate 40.0% Sodium citrate 4.0% EDTA.2Na 0.5% Water (in product) 20.0 %Less than

[Formulation Example 4] Potassium oleate 78.0% Potassium carbonate 17.0% Potassium citrate 5.0% Moisture (in product) 60.0% or less

[Effect test]

Sample Sample

Sample A (OCCCP: laboratory prepared):
Washing concentration 1g / l Sodium oleate 60% Sodium carbonate 32% Sodium citrate 5% Sodium percarbonate 3%

Sample B (OCC: laboratory prepared):
Washing instruction concentration 1g / l Sodium oleate 60% Sodium carbonate 35% Sodium citrate 5%

Sample C (rice bran powder soap: water wheel):
Washing instruction concentration 1.17 g / l Rice bran oil soap, sodium carbonate, edetic acid, fragrance

Sample D (Attack: Kaosha):
Washing concentration 0.83g / l Surfactant (41%): sodium linear alkylbenzene sulfonate, sodium alkyl sulfate, polyoxyethylene alkyl ether fatty acid sodium (pure soap) aluminosilicate, carbonate, fluorescent brightening Agent, enzyme

Sample E (bleach: sodium percarbonate):
Treatment concentration 10g / l Sodium percarbonate 100%

Trial cloth

(A) 100% cotton, (b) rayon,
(C) Polyester + cotton mixed spinning

Washing / rinsing conditions

Temperature 5 ° C., 20 ° C .: Stir at indicated concentration for 8 minutes, rinse twice, dry.

Dirt

A duvet cover to be used during sleep, in which a cloth is sewn on a portion touched by a user's chin and fixed for one month or more (dry sterilization in sunlight twice a week). A cloth having the same degree of stain strength is washed and cut into the same area for the test.

[Solubility comparison test]

Sample A used in the cleaning ability comparison test
Solubility of D was compared at 5 ° C. and 20 ° C. at the washing indicated concentration, and samples A and B were subjected to a double concentration test as a severe test.

Sample A: Dissolves in 5 minutes even at 5 ° C.
Even at double concentration, it dissolves in almost the same time. Dissolve at 20 ° C. for 2-3 minutes. Even at double concentration, it dissolves in almost the same time.

Sample B: Dissolves in 5 minutes even at 5 ° C.
Even at double concentration, it dissolves in almost the same time. Dissolve at 20 ° C. for 2-3 minutes. Even at double concentration, it dissolves in almost the same time.

Sample C: At 5 ° C., there was a considerable amount of unmelted residue, which remained even after 24 hours. 20 ° C
However, it is almost dissolved by stirring for 10 to 15 minutes, but it takes 20 minutes to completely dissolve it.

Sample D: Melting slowly at 5 ° C.,
Easier to melt than sample C. There is an insoluble component in the blending component, and that component precipitates. It almost dissolves at 20 ° C. in 5 minutes. There is an insoluble component in the blending component, and that component precipitates.

[Cleaning ability comparison test: Dry fabrics are visually compared and ranked. ]

In the case of 5 ° C. (the same result was obtained irrespective of the kind of cloth) Sample A> Sample B> Sample E> Sample C> Sample D

At 20 ° C. (same result was obtained regardless of the kind of cloth) Sample A> Sample B> Sample E> Sample C> Sample D

[Yellow comparison test: accelerated test]

Washing was repeated once a day for 10 days at 5 ° C. and drying in sunlight, and the presence or absence of yellowing was observed. Samples A, B, D
Was not observed, but in Sample C,
Clearly yellowing was observed.

[Odor comparison test after dehydration]: The test was conducted in an atmosphere at room temperature of 20 ° C. or higher.

In Samples A and B, no unpleasant odor was generated after 6 hours and 24 hours even after being left moist after dehydration (under severe conditions, put in a semi-dry vinyl bag and No unpleasant odor was produced over the course of a week).

Sample C was unpleasant because the rotten smell was mixed with the smell of the fragrance after 6 hours.

Sample D had only the odor of detergent fragrance, and no unpleasant odor.

[Liquid soap]

In a comparative test of rice bran potash soap made from rice bran oil and fat and potassium oleate, after immersing sweat stain gauze in cold water at 10 ° C. for 5 minutes, each soap was added to confirm the presence or absence of deposits. (For experiments, EDTA is added in advance in order to eliminate the influence of metal ions such as Ca ²⁺ ).

In the rice bran potash soap, a small amount of soap was deposited, but when potassium oleate was used, no deposit was observed.

[Stability test]

The sample was allowed to stand for 1 month under accelerated conditions (30 ° C.), and changes in detergency, solubility, appearance and the like were observed.

No particular change was observed in Samples A, B and D. In Sample C, the odor of the fragrance is reduced,
No major change was observed except that the color became slightly yellow.

[Water and powder]

As compared with normal powder soap (including saturated fatty acid soap), it cannot be powdered unless the water content is reduced. When crushing, it is necessary to be careful so that the temperature does not rise.

The water content of the manufactured soap powder is 12% or less in OCC (product of the present invention: standard type) and 10% or less in OCCP (product of the present invention: bleaching agent-mixed type), which is less than that of commercially available soap powder. The average is 15%.

Even when sodium carbonate and sodium citrate are blended in the conventional soap powder so as to have the same composition ratio as in the present invention, the detergency tends to be slightly improved, but a large amount of washing like the product of the present invention is obtained. No improvement in strength was observed.

It is considered that the reason is that the detergent power as soap is lowered because the fatty acid sodium which is inferior in the detergent power is contained.

[Compounding ingredients and detergency]

Here, the relationship between the compounding ingredients and the detergency will be explained. Sodium oleate 100% sodium oleate 95%, sodium citrate 5% sodium oleate 70%, sodium citrate 30% sodium oleate 70%, Sodium carbonate 30% Cope Rice bran soap (trade name: Mizu no Wa) Rice bran oil and fat soap, simple acid salt, edetic acid Rice bran oil and fat soap 60%, sodium carbonate 35%, sodium citrate 5% Olive oil soap 60%, sodium carbonate 35% , Sodium citrate 5% OCC (Invention product: Standard type) OCCP (Invention product: Bleaching agent combination type)

Under the temperature conditions of 5 ° C. and 10 ° C., the following detergency was evaluated. <<<<<<<<<<

Under the temperature condition of 20 ° C., the following detergency was evaluated. <<<<<<<<<<<<<<

The washing power of the soap powder prepared by blending sodium oleate with sodium carbonate and sodium citrate exhibited a remarkable effect as compared with the other samples.

The oleic acid contained in rice bran oil is 40 to 50.
%, Olive oil is 65 to 85%, and it has been found that the oil and fat soap having a high concentration of oleic acid improves the detergency by the combined use of sodium carbonate and sodium citrate.

[0089]

As described above, according to the present invention, since the powder soap is easily soluble in cold water, the convenience of the powder soap is improved. That is, in the present invention, there is a difference that it is easily dissolved even in water at 5 ° C. (use concentration is 2 to 3 minutes), but the present powder soap is 20% to 30% undissolved in cold water.

Further, when washed with cold water, there is an effect that a liquid soap in which difficult / insoluble soap is not deposited is obtained.

In addition, since the remaining undissolved soap content is eliminated, there is a feature that damage such as yellowing of clothes can be reduced, and the usability is comparable to that of synthetic detergents, and the cleaning power, safety and biodegradability are extremely high. It is possible to supply excellent soap powder.

Claims (2)

[Claims] 1. As a simple substance fatty acid sodium, 55 to 90% by weight of sodium oleate, and 8 to 4 of sodium carbonate.
A laundry powder soap which is easily soluble in cold water and which contains 0% by weight and 2 to 10% by weight of an organic acid salt. 2. Soap does not precipitate by washing with cold water containing 55 to 90% by weight of potassium oleate as potassium simple fatty acid, 8 to 40% by weight of potassium carbonate, and 2 to 10% by weight of organic acid potassium. Liquid soap.