CN118044996A

CN118044996A - Self-thickening compositions of amino acid surfactants

Info

Publication number: CN118044996A
Application number: CN202211434507.9A
Authority: CN
Inventors: 王鞠骏
Original assignee: Shanghai Jahwa United Co Ltd
Current assignee: Shanghai Jahwa United Co Ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2024-05-17
Also published as: WO2024104026A1

Abstract

The present invention discloses a self-thickening composition of an amino acid surfactant comprising: sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, sodium lauroyl glutamate, and a carrier acceptable in the personal care arts, wherein the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, and sodium lauroyl glutamate is from about 1-3:1-3:1-3, wherein the total concentration of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, sodium lauroyl glutamate is from 8-20% by weight, based on the total weight of the composition. The invention also discloses the application of the self-thickening composition in personal care products.

Description

Self-thickening compositions of amino acid surfactants

Technical Field

The invention relates to the field of colloid and surface chemistry, in particular to a self-thickening composition of a pure amino acid surfactant, a preparation method of the self-thickening composition and application of the self-thickening composition in cosmetics.

Background

With the vigorous development of national economy, the daily life level of society is increased, the demands and requirements of people for daily personal cleaning products are higher and higher, and consumers select personal cleaning products to pay more attention to the mildness and environmental protection of the products besides the richness and cleaning capability of foam. The amino acid surfactant is an improved anionic surfactant with the characteristics of mildness, safety, foamability, degradability and the like, and the characteristics of the amino acid surfactant accord with the current expectations of people on green, environment-friendly and pollution-free personal cleaning care products. Amino acid surfactants can be synthesized by biotechnology or chemical methods using recyclable raw materials such as amino acids, sugars, fatty acids, rosin, and the like. Depending on the amino group and the carboxyl group, different amino acid surfactants are constituted. Among them, five amino acid surfactants of glutamic acid, glycine, sarcosine, alanine and methyl taurine are commonly used.

In practical applications, it is found that the amino acid surfactant has a problem of difficult thickening, and the reason thereof may be related to the molecular structure of the amino acid surfactant. The hydrophilic end structure of the amino acid surfactant is larger, and the surfactant micelle is difficult to further develop to the worm-shaped micelle after the spherical micelle is formed, so that the system is difficult to thicken.

For this problem, product developers typically thicken the system by adding high amounts of thickener, but often do not work well, and the high cost and poor skin feel associated with high amounts of thickener make the solution a half effort.

Some prior art solutions have also disclosed several means for achieving the adhesion of the system by compounding different types of surfactants. However, most of these solutions use a combination of an amino acid surfactant with a higher amount of amphoteric surfactant, or a combination of an amino acid surfactant with a nonionic surfactant, and do not provide a thickening solution for a pure amino acid surfactant self-thickening system, which is more difficult to thicken than a thickening solution for a combination of different types of surfactants.

For example, CN20131012777769.5 discloses an amino acid type surfactant self-thickening composition, which adopts a scheme of compounding an amino acid surfactant with an amphoteric surfactant, and comprises cocamidopropyl hydroxysulfobetaine and sodium lauroyl sarcosinate as thickening agents, but the thickening effect is achieved by adding the amphoteric surfactant with a higher dosage than the amino acid surfactant for compounding. As another example, CN201810800313.3 discloses an amino acid surfactant thickening system, which adopts a scheme of compounding an amino acid surfactant with a nonionic, amphoteric surfactant, and comprises sodium lauryl sarcosinate, alkyl glycoside and cocamidopropylamine oxide as thickeners.

Still further embodiments disclose additional configuration of a separate amino acid system thickening composition to achieve thickening of an amino acid surfactant system. For example, CN201910873456.1 discloses a highly efficient amino acid thickener and a process for its preparation, comprising cetostearyl alcohol behenate, polyethylene glycol-150 and C8-C14 alkyl glucosides as thickeners for such systems. However, the thickening system introduces a component containing dioxane and has certain risk hidden trouble. And from the market trend of the fire, the product is green and environment-friendly, has no sulfate, no dioxane and even no corrosion, and is an indispensable component label of a mature and excellent personal cleaning care product.

Therefore, research and development of a pure amino acid surfactant system capable of self-thickening has important practical significance.

Disclosure of Invention

In one aspect, the present invention provides a self-thickening composition of an amino acid surfactant comprising:

sodium methyl cocoyl taurate,

Sodium lauroyl sarcosinate is used as a starting material,

Sodium lauroyl glutamate, and

A carrier that is acceptable in the field of personal care,

Wherein the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate and sodium lauroyl glutamate is about 1-3:1-3:1-3,

Wherein the total concentration of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, sodium lauroyl glutamate is 8-20% by weight based on the total weight of the composition.

In a preferred embodiment, the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, and sodium lauroyl glutamate is about 1-2:1-2:1-2. In a more preferred embodiment, the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, and sodium lauroyl glutamate is about 1:1:3. In a preferred embodiment, the total concentration of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, sodium lauroyl glutamate is from 8 to 12% by weight, based on the total weight of the composition. In a preferred embodiment, the pH of the self-thickening composition of the present invention is from 4.0 to 6.2. In a more preferred embodiment, the pH of the self-thickening composition is from about 4.6 to about 6.2.

In another aspect, the present invention also relates to the use of the self-thickening composition in personal care products. In a preferred embodiment, the personal care product is selected from the group consisting of: infant bath lotion, infant shampoo, children hand lotion, adult bath lotion, adult shampoo, adult hand lotion and adult facial cleanser.

In a preferred embodiment, the self-thickening composition of the present invention is used in an amount equal to or greater than 20% by weight in a personal care product. In a more preferred embodiment, the self-thickening composition is present in an amount equal to or greater than 50% by weight of the personal care product.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods and materials are described herein. For the purposes of the present invention, the following terms are defined below.

The term "about" as used herein refers to an amount, level, value, dimension, size, or use that may differ by up to 30%, 20%, or 10% from the amount, level, value, dimension, size, or use of a reference. The percentages used herein are by weight unless otherwise indicated.

Throughout the specification and claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

Applicants have unexpectedly found that pure amino acid surfactants are capable of preparing compositions that form self-thickening. The self-thickening composition is capable of achieving a thickening effect within a pH range acceptable in the personal care arts (e.g., pH 4.0-6.2). Therefore, the invention firstly compounds the sodium methyl cocoyl taurate, the sodium lauroyl glutamate and the sodium lauroyl sarcosinate to form the self-thickening composition, thereby providing high-efficiency thickening effect. The self-thickening composition can be incorporated into personal care products while still maintaining an efficient thickening effect.

In a preferred embodiment, the self-thickening composition of the present invention consists essentially of sodium methyl cocoyl taurate, sodium lauroyl glutamate, sodium lauroyl sarcosinate and a carrier acceptable in the personal care arts. In a preferred embodiment, the carrier acceptable in the personal care arts is an aqueous carrier. For example, the carrier is water, e.g., pure water, distilled water, deionized water, and the like.

As used herein, the term "consisting essentially of … …" means that the composition contains less than about 1%, preferably less than about 0.5%, of ingredients other than those listed. The term "consisting essentially of … …" means that the indicated material is present in an amount of from about 99.5% to about 100% by weight, preferably from about 99.9% to about 100% by weight, and more preferably from 99.99% to about 100% by weight, and most preferably all other materials are present only as impurities below the analytically detectable content.

Amino acid surfactants

The amino acid type surfactant is a mild and degradable anionic surfactant, and the main active component of the amino acid type surfactant is compound amino acid sodium salt. Currently, amino acid surfactants have been widely used: medical products such as gynecological lotion, wound cleansing liquid, and analgesic; daily chemical products such as shampoo, infant washing products, bath lotion, facial cleanser and hand cleanser; oral care products such as toothpastes, tooth powders, mouthwashes, and the like.

The performance of the amino acid surfactant in daily chemical washing products is mainly shown as follows: (1) The foam is rich and stable, has mild properties, and can reduce the irritation of the whole formula; (2) Can promote flocculation in shampoo formulation and make conditioner, silicone oil, nutrient components, etc. adsorbed on hair. The use efficiency of the conditioner, the silicone oil, the nutrient components and the like is improved, and the use amount of the conditioner, the silicone oil, the nutrient components and the like in the formula is reduced; (3) Has excellent sterilization and bacteriostasis performance and excellent anti-dandruff and antipruritic effects; (4) Has the property of repairing chemically and naturally damaged hair; (5) imparting good appearance and rheology to the product; (6) easy degradation and no pollution to the environment; (7) pH 7-9, mild and no irritation.

Sodium methyl cocoyl taurate is a novel amino acid type surfactant. The natural fatty acid is condensed with sodium methyltaurine, so that the natural fatty acid foam is rich, fine and stable under the condition of wide pH value, has very small skin irritation caused by a hydrophilic amino acid structure, and is often used for preparing various high-grade cosmetics, infant products and the like.

Sodium lauroyl glutamate is a common amino acid surfactant. In practical application, lauroyl sodium glutamate has the characteristic of difficult thickening. Sodium lauroyl glutamate has the problem that the surfactant of the amino acid type is difficult or impossible to thicken in the application of personal care products because of the fact that the sodium lauroyl glutamate contains two larger carboxylic acid groups as hydrophilic heads.

Sodium lauroyl sarcosinate is also a common amino acid surfactant. In practical application, lauroyl sarcosinate has the characteristic of difficult thickening. For example, at an active content of 8% by weight, at a pH of 5.2-6.5, the viscosity of sodium lauroyl sarcosinate is very low, only 8mPa.s. Thus, sodium lauroyl sarcosinate alone has substantially no thickening effect.

However, the present invention surprisingly found that the composition obtained by combining sodium methyl cocoyl taurate, sodium lauroyl glutamate and sodium lauroyl sarcosinate together has a self-thickening effect. Thus, the present invention innovatively provides a self-thickening composition comprising sodium methyl cocoyl taurate, sodium lauroyl glutamate, and sodium lauroyl sarcosinate, which has a synergistic thickening effect over a pH range acceptable in the personal care arts.

In some embodiments, the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl glutamate, and sodium lauroyl sarcosinate in the self-thickening composition is 1-3:1-3:1-3. In a preferred embodiment, the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl glutamate, and sodium lauroyl sarcosinate in the self-thickening composition is 1-2:1-2:1-2. In a specific embodiment, the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl glutamate, and sodium lauroyl sarcosinate in the self-thickening composition is 2:1:2. In a specific embodiment, the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl glutamate, and sodium lauroyl sarcosinate in the self-thickening composition is 1:1:3.

Self-thickening composition

The present invention is based on the following unexpected findings: the sodium methyl cocoyl taurate, sodium lauroyl glutamate and sodium lauroyl sarcosinate can synergistically improve the viscosity after being combined, and have excellent self-thickening capability.

In certain embodiments, the surfactant in the compositions of the present invention consists essentially of sodium methyl cocoyl taurate, sodium lauroyl glutamate, and sodium lauroyl sarcosinate. In a preferred embodiment, the compositions of the present invention are substantially free of other types of surfactants.

In a preferred embodiment, the compositions of the present invention have a self-thickening effect, and can be added as a thickener to personal care products with a superior thickening effect. In a preferred embodiment, the compositions of the present invention are substantially free of additional thickening agents.

The term "substantially free of" or "substantially free of" means that the indicated material is present in an amount of from 0wt% to 0.5 wt%, or preferably from 0wt% to 0.1 wt%, or more preferably from 0wt% to 0.01 wt%, and most preferably it is not present in an analytically detectable amount.

In certain embodiments, the total concentration of surfactants in the compositions of the present invention is from 5 to 25% by weight. In a preferred embodiment, the total concentration of surfactants in the compositions of the present invention is from 5 to 20% by weight. In a preferred embodiment, the total concentration of surfactants in the compositions of the present invention is from 8 to 15% by weight. In a more preferred embodiment, the total concentration of surfactants in the compositions of the present invention is from 8 to 12% by weight. In a more preferred embodiment, the total concentration of surfactants in the compositions of the present invention is from 8 to 10% by weight.

Any organic or inorganic acid may be used to adjust the pH of the self-thickening composition of the present invention. For example, acids that may be used include, but are not limited to: inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid and phosphoric acid, carboxylic acids such as acetic acid, fumaric acid, maleic acid, oxalic acid, malonic acid, succinic acid, citric acid and malic acid, sulfonic acids such as methanesulfonic acid, ethanesulfonic acid, benzenesulfonic acid and toluenesulfonic acid, and amino acids such as glutamic acid and aspartic acid.

The pH of the self-thickening composition of the present invention may be equal to or greater than 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9 or 5.0. In some embodiments, the pH of the self-thickening composition of the present invention is from 4.0 to 6.2. In some embodiments, the pH of the self-thickening composition of the present invention is from 4.6 to 6.2.

The invention is further illustrated below in connection with specific examples. It is to be understood that these examples are illustrative of the present invention and are not to be construed as limiting the scope of the present invention. The test methods in the following examples, in which specific conditions are not specified, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. All percentages and parts are by weight unless otherwise indicated.

1. Experimental materials

Lauroyl sodium glutamate (active ingredient content 91.5% -100%), purchased from new material stock, inc. Of high-speed, guangzhou (trade name AMIN LG 95U);

Sodium methyl cocoyl taurate (active ingredient content 30%), purchased from Inonostrep (trade name PUREACT WS CONC);

Lauroyl sarcosine sodium (active ingredient content 30%) was purchased from new materials stock, inc. Of the new material, trichima, under the trade name AMIN LS 30.

2. Experimental instrument

A viscosimeter: brookfield RVDVS A

3. Experimental process

3.1 Weighing selected amounts of the surfactant Complex Components

3.2 Weighing deionized water, adding the weighed mixture of the components in the first step into the deionized water under the condition of stirring, heating to 75 ℃, and keeping stirring until the mixture is uniform

3.3 Cooling to 25deg.C, adding citric acid to adjust pH

3.4, Placing the prepared sample into a 25 ℃ incubator for 24 hours, taking out, selecting a proper rotor and rotating speed, testing the viscosity of the sample by using a Brookfield viscometer, recording data after waiting for stable reading, and testing the viscosity at 25 ℃.

Examples 1 to 6: preparation of self-thickening compositions

Examples 1-6 describe the preparation of compositions with a ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate to sodium lauroyl glutamate of about 1:1:1 and a total active content of about 10%.

77.7G of sodium methyl cocoyl taurate, 77.7g of sodium lauroyl sarcosinate and 23.31g of sodium lauroyl glutamate are weighed, 521.29g of deionized water is added, stirring is started, the speed is 380 r/min, heating to 75 ℃ is started, and stirring is kept for 10 minutes until uniform dissolution is achieved.

Cooling to 25deg.C, adding citric acid to adjust pH to 4.4-4.9, respectively, for use, as shown in Table 1 below.

TABLE 1

Test example 1: effect of pH on viscosity of self-thickening compositions

Samples prepared in examples 1-6 were placed in a 25℃incubator for 24 hours and then removed, a 3# rotor was selected, the rotational speed was 12rpm, the viscosity of the samples was measured using a Brookfield viscometer, the data were recorded after waiting for the reading to stabilize, and the viscosity was measured at 25 ℃.

Sodium methyl cocoyl taurate, sodium lauroyl glutamate and sodium lauroyl sarcosinate are three commonly used amino acid surfactants, have the problem of difficult thickening in terms of use, and greatly increase the application difficulty. Examples 1-6 examined the effect of the three when formulated for use at a total active content of about 10%, a pH of 4.4-4.9, and a ratio of about 1:1:1, and the results are shown in Table 2.

TABLE 2

From the results, it is clear that there is a synergistic self-thickening effect when the active content ratios of sodium methyl cocoyl taurate, sodium lauroyl glutamate and sodium lauroyl sarcosinate are compounded in a ratio of about 1:1:1, and the pH ranges from 4.4 to 4.9. Especially when the pH is in the range of 4.5-4.6, the viscosity of the composition reaches the peak value of the compound, and the viscosity can reach more than 700 under the condition of no amphoteric or nonionic surfactant. Continuously adjusting the proportion of the composition and observing the result.

Examples 7 to 13: preparation of self-thickening compositions

Examples 7-13 describe the preparation of compositions with a ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate to sodium lauroyl glutamate of about 1:2:1 and a total active content of about 10%.

58.33G of sodium methyl cocoyl taurate, 116.67g of sodium lauroyl sarcosinate and 17.5g of sodium lauroyl glutamate are weighed, 507.5g of deionized water is added, stirring is started, the speed is 380 r/min, heating to 75 ℃ is started, and stirring is kept for 10 minutes until uniform dissolution is achieved.

Cooling to 25deg.C, adding citric acid to adjust pH to 4.5-5.1, respectively, for use, as shown in Table 3 below.

TABLE 3 Table 3

Test example 2: effect of pH on viscosity of self-thickening compositions

Samples prepared in examples 7-13 were placed in a 25℃incubator for 24 hours and then removed, a 3# rotor was selected, the rotational speed was 12rpm, the viscosity of the samples was measured using a Brookfield viscometer, the data were recorded after waiting for the reading to stabilize, and the viscosity was measured at 25 ℃.

Examples 7-13 examined the effect of the three when formulated for use at a total active content of 10%, pH4.5-5.1, and at a ratio of about 1:2:1, and the results are shown in Table 4.

TABLE 4 Table 4

From the results, when the three active contents were compounded at a ratio of about 1:2:1, the thickening effect was inferior to 1:1:1 at pH 4.5-5.1, and the peak value appeared at pH4.7, the viscosity was 430. Continuously adjusting the proportion of the composition and observing the result.

Examples 14 to 19: preparation of self-thickening compositions

Examples 14-19 describe the preparation of compositions with sodium methyl cocoyl taurate, sodium lauroyl sarcosinate and sodium lauroyl glutamate in a ratio of about 1:1:2 and a total active content of about 10%.

58.33G of sodium methyl cocoyl taurate, 58.33g of sodium lauroyl sarcosinate and 35g of sodium lauroyl glutamate are weighed, 548.33g of deionized water is added, stirring is started, the speed is 380 r/min, heating to 75 ℃ is started, and stirring is kept for 10 minutes until uniform dissolution is achieved.

Cooling to 25deg.C, adding citric acid to adjust pH from 4.4 to 4.9, respectively, for use, as shown in Table 5 below.

TABLE 5

Test example 3: effect of pH on viscosity of self-thickening compositions

Samples prepared in examples 14-19 were placed in a 25℃incubator for 24 hours and then removed, a 3# rotor was selected, the rotational speed was 12rpm, the viscosity of the samples was measured using a Brookfield viscometer, the data were recorded after waiting for the reading to stabilize, and the viscosity was measured at 25 ℃.

Examples 14-19 examined the effect of the three when formulated for use at a total active content of about 10%, pH4.4-4.9, and at a ratio of about 1:1:2, and the results are shown in Table 6.

TABLE 6

From the results, when the active matter content ratio of the three components is compounded in a ratio of 1:1:2, the result of the synergistic self-thickening effect exists under the pH range of 4.4-4.9, and especially when the pH is in the range of 4.5-4.6, the viscosity of the composition reaches the compounding peak value, and the peak viscosity can reach 1100 under the pH of 4.6. The composition ratio was continuously adjusted, and the results were observed.

Examples 20 to 27: preparation of self-thickening compositions

Examples 20-27 describe the preparation of compositions with a ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate to sodium lauroyl glutamate of about 2:1:1 and a total active content of about 10%.

116.67G of sodium methyl cocoyl taurate, 58.33g of sodium lauroyl sarcosinate and 17.5g of sodium lauroyl glutamate are weighed, 507.5g of deionized water is added, stirring is started, the speed is 380 r/min, heating to 75 ℃ is started, and stirring is kept for 10 minutes until uniform dissolution is achieved.

Cooling to 25 ℃, adding citric acid to adjust the pH value from 4.0 to 4.7 for standby, as shown in the following table 7.

TABLE 7

Test example 4: effect of pH on viscosity of self-thickening compositions

Samples prepared in examples 20-27 were placed in a 25℃incubator for 24 hours and then removed, a 3# rotor was selected, the rotational speed was 12rpm, the viscosity of the samples was measured using a Brookfield viscometer, the data were recorded after waiting for the reading to stabilize, and the viscosity was measured at 25 ℃.

Examples 20-27 examined the effect of the three when formulated for use at a total active content of about 10%, pH4.0-4.7, and at a ratio of about 2:1:1, and the results are shown in Table 8.

TABLE 8

From the results, when the active matter content ratio of the three components is compounded in a ratio of 2:1:1, the result of the synergistic self-thickening effect exists under the pH range of 4.0-4.7, and especially when the pH is in the range of 4.1-4.2, the viscosity of the composition reaches the compounding peak value, and the peak value viscosity can reach 1250 under the pH of 4.2. The composition ratio is continuously adjusted in consideration of that the effective pH range is far lower than that of the conventional product. The results of this test example and test example 3 are combined, the composition ratio is adjusted to 2:1:2, and the results and their pH ranges of onset are observed.

Examples 28 to 35: preparation of self-thickening compositions

Examples 28-35 describe the preparation of compositions with a ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate to sodium lauroyl glutamate of about 2:1:2 and a total active content of about 10%.

93.33G of sodium methyl cocoyl taurate, 46.67g of sodium lauroyl sarcosinate and 28g of sodium lauroyl glutamate are weighed, 532g of deionized water is added, stirring is started, the speed is 380 r/min, heating to 75 ℃ is started, and stirring is kept for 10 minutes until uniform dissolution is achieved.

Cooling to 25 ℃, adding citric acid to adjust the pH value from 4.0 to 4.7 for standby, as shown in the following table 9.

TABLE 9

Test example 5: effect of pH on viscosity of self-thickening compositions

Samples prepared in examples 28-35 were placed in a 25℃incubator for 24 hours and then removed, a 3# rotor was selected, the rotational speed was 12rpm, the viscosity of the samples was measured using a Brookfield viscometer, the data were recorded after waiting for the reading to stabilize, and the viscosity was measured at 25 ℃.

Examples 28-35 examined the effect of the three when formulated for use at a total active content of about 10%, pH4.0-4.7, and at a ratio of about 2:1:2, and the results are shown in Table 10.

Table 10

From the results, when the active content ratio of the three is compounded in a ratio of 2:1:2, the synergistic self-thickening effect results exist at the pH range of 4.0-4.7, and the viscosity of the composition can reach the peak viscosity 1217 when the pH is 4.3. The peak viscosity pH is not significantly increased compared with 2:1:1. The effect was observed by continuing to increase the amount of sodium lauroyl glutamate according to the results of test example 3.

Examples 36 to 40: preparation of self-thickening compositions

Examples 36-40 describe the preparation of compositions with sodium methyl cocoyl taurate, sodium lauroyl sarcosinate and sodium lauroyl glutamate in a ratio of about 1:1:3 and a total active content of about 10%.

46.67G of sodium methyl cocoyl taurate, 46.67g of sodium lauroyl sarcosinate and 42g of sodium lauroyl glutamate are weighed, 564.67g of deionized water is added, stirring is started, the speed is 380 r/min, heating to 75 ℃ is started, and stirring is kept for 10 minutes until uniform dissolution is achieved.

Cooling to 25deg.C, adding citric acid to adjust pH to 4.4-4.8, respectively, for use, as shown in Table 11 below.

TABLE 11

Test example 6: effect of pH on viscosity of self-thickening compositions

Samples prepared in examples 36-40 were placed in a 25℃incubator for 24 hours and then removed, a 3# rotor was selected, the rotational speed was 12rpm, the viscosity of the samples was measured using a Brookfield viscometer, the data were recorded after waiting for the reading to stabilize, and the viscosity was measured at 25 ℃.

Examples 36-40 examined the effect of the three when formulated for use at a total active content of 10%, pH4.4-4.8, and at a ratio of 1:1:3, and the results are shown in Table 12.

Table 12

From the results, when the active matter content ratio of the three is compounded in a ratio of 1:1:3, the result of the synergistic self-thickening effect exists in the pH range of 4.4-4.8, and when the pH is 4.6, the viscosity of the composition can reach the peak viscosity of 1400. The ratio has the best self-thickening effect in the attempted compound, and achieves the effect of a common self-thickening composition. The following changes in the self-thickening effect were observed by changing the total active content on a 1:1:3 basis.

Examples 41 to 45: preparation of self-thickening compositions

Examples 41-45 describe the preparation of compositions with fixed ratios of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate to sodium lauroyl glutamate of about 1:1:3, with a total active content of about 8%.

37.31G of sodium methyl cocoyl taurate, 37.31g of sodium lauroyl sarcosinate and 33.6g of sodium lauroyl glutamate are weighed, 588.63g of deionized water is added, stirring is started, the speed is 380 r/min, heating to 75 ℃ is started, and stirring is kept for 10 minutes until uniform dissolution is achieved.

Cooling to 25deg.C, adding citric acid to adjust pH from 4.4 to 4.8, respectively, for use, as shown in Table 13 below.

TABLE 13

Examples 46 to 50: preparation of self-thickening compositions

Examples 46-50 describe the preparation of compositions with fixed ratios of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate to sodium lauroyl glutamate of about 1:1:3, varying the total active content to about 12%.

56G of sodium methyl cocoyl taurate, 56g of sodium lauroyl sarcosinate and 50.41g of sodium lauroyl glutamate are weighed, 532.91g of deionized water is added, stirring is started, the speed is 380 r/min, heating to 75 ℃ is started, and stirring is kept for 10 minutes until uniform dissolution is achieved.

Cooling to 25deg.C, adding citric acid to adjust pH from 4.4 to 4.8, respectively, for use, as shown in Table 14 below.

TABLE 14

Examples 51 to 55: preparation of self-thickening compositions

Examples 51-55 describe the preparation of compositions with fixed ratios of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate to sodium lauroyl glutamate of about 1:1:3, with a total active content of about 15% being varied.

70G of sodium methyl cocoyl taurate, 70g of sodium lauroyl sarcosinate and 63g of sodium lauroyl glutamate are weighed, 497g of deionized water is added, stirring is started, the speed is 380 r/min, heating to 75 ℃ is started, and stirring is kept for 10 minutes until uniform dissolution is achieved.

Cooling to 25deg.C, adding citric acid to adjust pH from 4.4 to 4.8, respectively, for use, as shown in Table 15 below.

TABLE 15

Test example 7: effect of pH on viscosity of self-thickening compositions

Samples prepared in examples 41-55 were placed in a 25℃incubator for 24 hours and then removed, a 3# rotor was selected, the rotational speed was 12rpm, the viscosity of the samples was measured using a Brookfield viscometer, the data were recorded after waiting for the reading to stabilize, and the viscosity was measured at 25 ℃.

Examples 41-55 examined the self-thickening effect of the system in the pH range of 4.4-4.8 with the total active content adjusted to 8%, 12% and 15% at a fixed 1:1:3 ratio, and the results are shown in Table 16, while the results of 10% total active content in test example 6 are included in Table 16 for comparison.

Table 16

From the results, it is clear that the system has a synergistic self-thickening effect at a total active content ranging from about 8% to 15%, and the viscosity of the composition reaches its peak viscosity at a pH of 4.6. From the results, example 43 at 8% total active content and example 38 at 10% total active content both showed good self-thickening efficiency, although the self-thickening viscosity was highest at 15% total active content, combined with the cost of use.

Application example

The composition of the invention can be used as an intermediate raw material for preparing corresponding personal cleaning care products, and the personal cleaning care products are preferably rinse-off cleaning product compositions, including but not limited to preparation of products in dosage forms of body washes, shampoos, shampoo body washes, children's hand washes, body washes for adults, shampoos, hand washes, face washes and the like for infants. The following are specific examples of the use of the compositions obtained by the examples in personal cleansing care products, as well as the formulations and methods of making these dosage forms. Specific applications are as follows:

Application example 1: preparation of baby bath lotion

Application example 2: preparation of baby shampoo

Application example 3: preparation of shampoo and bath lotion for infants

Application example 4: preparation of bath lotion

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Application example 5: preparation of hand sanitizer for children

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Claims

1. A self-thickening composition of an amino acid surfactant comprising:

sodium methyl cocoyl taurate,

Sodium lauroyl sarcosinate is used as a starting material,

Sodium lauroyl glutamate, and

A carrier that is acceptable in the field of personal care,

2. The self-thickening composition according to claim 1, wherein the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate and sodium lauroyl glutamate is about 1-2:1-2:1-2.

3. The self-thickening composition according to claim 2, wherein the weight ratio of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate and sodium lauroyl glutamate is about 1:1:3.

4. The self-thickening composition according to claim 1, wherein the total concentration of sodium methyl cocoyl taurate, sodium lauroyl sarcosinate, sodium lauroyl glutamate is 8-12% by weight, based on the total weight of the composition.

5. The self-thickening composition according to claim 1, wherein the pH of the composition is from 4.0 to 6.2.

6. The self-thickening composition of claim 5, wherein the pH of said composition is from about 4.6 to about 6.2.

7. Use of a composition according to any one of claims 1 to 6 in a personal care product.

8. The use according to claim 7, wherein the personal care product is selected from the group consisting of: infant bath lotion, infant shampoo, children hand lotion, adult bath lotion, adult shampoo, adult hand lotion and adult facial cleanser.

9. The use according to claim 7, wherein the composition is present in an amount equal to or greater than 20% by weight in a personal care product.

10. The use according to claim 9, wherein the composition is present in an amount equal to or greater than 50% by weight of the personal care product.