Application of rhamnolipid in improving transparency and shampoo

Abstract

The present invention discloses an application of rhamnolipid in improving transparency and a shampoo. Specifically, it discloses an application of a rhamnolipid composition in improving the transparency of daily chemical products having a cationic conditioner, and discloses a shampoo, which comprises a surfactant and a cationic conditioner. The surfactant comprises a group consisting of rhamnolipid and other surfactants other than rhamnolipid; the mass proportion of the rhamnolipid in the shampoo is above 0.5%, and the mass proportion of the above-mentioned cationic conditioner in the shampoo is above 0.01%. When the rhamnolipid in the present invention is applied to daily chemical products having a cationic conditioner, it exhibits excellent transparency, improves the transparency defect of the surfactant formula derived from petrochemicals and the cationic conditioner used in combination, and at the same time circumvents the deficiency of the rhamnolipid itself in terms of foam, and has a better consumer use experience.

Description

Technical Field

[0001] The present invention relates to the technical field of shampoo preparation, and specifically relates to the application of rhamnolipid in improving transparency and a shampoo. Background Art

[0002] Rhamnolipid is a glycolipid biosurfactant produced by certain microorganisms (usually bacteria) and can also be cultured through a fermentation process. These glycolipids have a polar head group composed of one or two rhamnose units and a hydrophobic tail group composed of one or two hydrocarbon chains. The selection of bacteria (usually but not limited to Pseudomonas aeruginosa) and the optimization of fermentation conditions can produce different proportions of mono-rhamnolipid and di-rhamnolipid. Rhamnolipid has good surface activity, a green source, and the characteristic of 100% biodegradability, and is a new generation of surfactant that is more in line with sustainable development. However, rhamnolipid also has technical barriers such as less foam volume, poor foam stability, and low thickening responsiveness when used alone.

[0003] Currently, most commercially available shampoos use a combined formula of surfactants from petrochemical sources. When compounded with cationic conditioners, it can improve the conditioning performance of the product, but it will also bring a series of problems to the product itself. For example: First, some products are overall opaque and prone to precipitate crystals or flocs locally, unable to provide a transparent and pure visual experience; Second, the cleaning effect of the formula composition is too strong, with high irritation, and is prone to cause a series of problems such as scalp inflammation, itching, and frizzy hair; Third, while the cationic conditioner smooths frizzy hair, it may accumulate excessively on the scalp and hair, causing problems such as oily scalp and hair loss.

[0004] Therefore, how to improve the transparency of the system while ensuring the appropriate cleaning strength and foam performance of the system, so as to improve the shortcomings of transparency, irritation, and accumulation problems caused by simply using surfactants from petrochemical sources and cationic conditioners, and endow the product with better appearance texture is the technical problem to be solved urgently by the present invention. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is how to improve the defect of poor transparency caused by simply using surfactants from petrochemical sources compounded with cationic conditioners, and at the same time avoid the deficiency of rhamnolipid itself in terms of foam performance, and provide an application of rhamnolipid in improving transparency to solve the above problems.

[0006] An application of rhamnolipid in improving the transparency of a daily chemical product having a cationic conditioner.

[0007] The rhamnolipid components include mono-rhamnolipid and / or di-rhamnolipid, etc. It can be a single compound or a composition composed of multiple rhamnolipid compounds. The rhamnolipid added in the present invention is a commercially available product, which can achieve the purpose of improving the poor transparency caused by the simple compounding of surfactants derived from petrochemical sources and cationic conditioners. The above-mentioned rhamnolipid in the present invention can be compounded from various types of pure rhamnolipids, can also be obtained by screening and purifying the fermentation broth, and can also be obtained by adjusting the fermentation process to change the ratio of various rhamnolipids.

[0008] In some preferred embodiments, the addition amount of the rhamnolipid can be more than 0.5% of the total mass of the daily chemical product. For example, it can be about 1%, about 5%, about 9%, about 10%, about 20% or can be any mass percentage range. The addition within the above range can effectively improve the transparency of the daily chemical product. However, the rhamnolipid is a slightly yellowish product with a fruity aroma. To reduce the impact on the color and odor of the system itself and achieve the effect of significantly improving the transparency, in some more preferred embodiments, the addition amount can preferably be 2-8%.

[0009] The function of the cationic conditioner in the daily chemical product is to improve the combability of hair, reduce the generation of hair static electricity, and endow hair with a sense of luster and smoothness. The cationic conditioner includes but is not limited to polysiloxane quaternary ammonium salts, modified cellulose-based cationic polymers (such as polyquaternium, etc., preferably polyquaternium-6, polyquaternium-7, polyquaternium-10, polyquaternium-22, polyquaternium-37), cationic guar gum (guar gum hydroxypropyltrimethylammonium chloride), etc. The molecular weight and cationic substitution degree of cationic conditioner products on the market have a relatively large range. Among them, the larger the molecular weight, the higher the product viscosity can be increased; the higher the charge density, the stronger the antistatic effect and conditioning effect, and at the same time, the greater the accumulation generated, and long-term use will cause the hair to be dull and sticky and greasy. In the present invention, polyquaternium-7 (PQ-7), polyquaternium-10 (PQ-10) and cationic guar gum (guar gum hydroxypropyltrimethylammonium chloride) are preferred.

[0010] In some preferred embodiments, the conventional dosage mass ratio of the cationic conditioner in the daily chemical product is more than 0.01%. For example, it can be about 0.01%, about 0.02%, about 0.04%, about 0.05%, about 0.1%, about 0.5%, about 0.8% or can be any mass percentage range. Preferably, the dosage of the cationic conditioner can be 0.01-0.5% of the total mass of the daily chemical product. In combination with the rhamnolipid, even at a relatively high addition amount of the cationic conditioner, a better transparency effect than the conventional shampoo formula can be achieved, and the rhamnolipid can effectively reduce the accumulation of the cationic conditioner on the hair and scalp.

[0011] In some alternative embodiments, the daily chemical product may further include surfactants of petrochemical origin.

[0012] In some alternative embodiments, the pH of the daily chemical product at 25 °C ranges from 2.5 to 7.5.

[0013] The daily chemical product in the present invention is preferably a product for personal care, more preferably a product for hair care, body care or hand care. As the most preferred embodiment, the daily chemical product is shampoo.

[0014] The present invention also provides a shampoo, which includes surfactants and cationic conditioners. The surfactants include rhamnolipids and surfactants of petrochemical origin; the added mass ratio of rhamnolipids in the shampoo is more than 0.5%; the added mass ratio of the cationic conditioner in the shampoo is more than 0.01%.

[0015] Among them, the surfactants of petrochemical origin include one or a combination of more of anionic surfactants, zwitterionic surfactants, and nonionic surfactants.

[0016] The anionic surfactants are selected from one or a combination of more of alkyl sulfates, fatty alcohol ether sulfates, alkyl benzene sulfonates, alkane sulfonates, olefin sulfonates, alkyl ether sulfonates, glycerol ether sulfonates, methyl ester sulfonates, sulfofatty acids, glycerol ether sulfates, alkyl ether sulfates, hydroxy mixed ether sulfates, glycerol monoester (ether) sulfates, fatty acid amide (ether) sulfates, monoalkyl sulfosuccinates, dialkyl sulfosuccinates, monoalkyl sulfosuccinamates, dialkyl sulfosuccinamates, sulfoglycerides, amides, ether carboxylic acids and their salts, fatty acid hydroxyethyl sulfonates, fatty acid sarcosinates, fatty acid taurates, N-acyl amino acids, alkyl oligoglycoside sulfates, and alkyl oligoglycoside carboxylates. The added mass ratio of the anionic surfactant in the shampoo is 1-40%. For example, it can be about 1%, about 2%, about 5%, about 7%, about 9%, about 10%, about 12%, about 15%, about 16%, about 20%, about 30%, about 40% or can be any mass percentage range. The above anionic surfactants have low prices, strong detergency and degreasing power, and good foaming properties. However, when the dosage of the anionic surfactant is relatively high, the degreasing power of the system will be too strong, and long-term use will damage the scalp barrier, which may cause dry, frizzy, split and falling hair. Therefore, the dosage of the anionic surfactant should be appropriate. In some more preferred embodiments, the dosage can be preferably 4-20%.

[0017] The zwitterionic surfactant is selected from one or a combination of more than one of betaine-type zwitterionic surfactants and / or imidazoline-type zwitterionic surfactants and / or amine oxide-type zwitterionic surfactants. Among them, the betaine-type zwitterionic surfactants include one or a combination of more than one of carboxylic acid-type betaines, sulfonic acid-type betaines, phosphate ester-type betaines, sulfate ester-type betaines, alkyl-type betaines, such as cocamidopropyl betaine, lauryl hydroxy sulfobetaine, lauramidopropyl hydroxysulfobetaine, etc. The imidazoline-type zwitterionic surfactants include one or a combination of more than one of sodium lauroamphoacetate, sodium cocoamphoacetate, disodium lauroamphodiacetate, disodium cocoamphodiacetate. The mass proportion of the above zwitterionic surfactant in the shampoo is 0.1-45%, for example: it can be about 2%, about 5%, about 7%, about 9%, about 10%, about 10.5%, about 14%, about 16%, about 20%, about 30%, about 40%, about 45% or can be any mass percentage range. Among them, when an anionic surfactant (such as: fatty alcohol ether sulfate) is combined with a zwitterionic surfactant (such as: cocamidopropyl betaine), it can effectively reduce the irritation of the anionic surfactant to the skin and eyes and increase the viscosity of the system. However, too much addition of the zwitterionic surfactant in the system will reduce the foam performance. Therefore, in some preferred embodiments, the dosage of the zwitterionic surfactant is preferably 1-20%.

[0018] The non-ionic surfactant is selected from one or a combination of more than one of alkyl glycosides, alkanolamides, fatty alcohol polyoxyethylene ethers, fatty acid polyoxyethylene esters, polyoxyethylene alkylamines, polyoxyethylene alkyl alkanolamides, polyol esters, polyol polyesters. The added mass proportion of the non-ionic surfactant in the shampoo is 0.1-30%, for example: it can be about 0.2%, about 0.5%, about 4%, about 7%, about 10%, about 15%, about 20%, about 25%, about 30% or can be any mass percentage range; the added mass proportion of the non-ionic surfactant in the shampoo is preferably 1-10%.

[0019] The shampoo of the present invention also has conventional additives, including but not limited to solubilizers, thickeners, brighteners, antidandruff and antipruritic agents, moisturizers, preservatives, pH regulators, fragrances, pigments, etc.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. Application of rhamnolipid in improving transparency of daily chemical products with cationic conditioner. The rhamnolipid is a biosurfactant with good biodegradability, lower toxicity and environmental compatibility, and has the advantages of a greener and safer fermentation source. Compared with surfactants from petrochemical sources, it has an advantage in product source. Moreover, when the rhamnolipid is applied to daily chemical products with cationic conditioner, it shows excellent transparency, improves the transparency defect of the compounding formula of simply using surfactants from petrochemical sources and cationic conditioner, and has a better consumer experience. Specifically, the mechanism of improving transparency may be that the accumulation of cationic conditioner is very sensitive to the types and proportions of the main surfactant, co-surfactant and salt used. Since the rhamnolipid itself has a relatively large molecular weight and undergoes anionic-nonionic structural transformation under different acid-base conditions, compared with ordinary anionic / zwitterionic / nonionic surfactants, it is more difficult to form stable micelles. After adding it to the daily chemical product system with cationic conditioner, the transparency of the system can be improved by changing the micelle size of the original system.

[0022] 2. A shampoo provided by the present invention not only improves the defect of poor transparency when anionic / zwitterionic / nonionic surfactants are compounded with cationic conditioner, but also changes the electric charge of the surfactant micelles bound to the molecular chain segment of the cationic conditioner by introducing rhamnolipid, which can effectively shield part of the charges of the anion surfactant and the cationic conditioner, thereby adjusting the charge density of the shampoo system, avoiding the excessive action of the cationic conditioner to form flocculation and resulting in its accumulation on the scalp, and reducing the risks of oily scalp, itchy scalp and hair loss. At the same time, the shampoo of the present invention shows an appropriate cleaning feeling and can solve the balance between the greasy feeling caused by the accumulation and residue of the cationic conditioner and the smooth feeling lacking combability from the source.

[0023] 3. When a shampoo provided by the present invention simply uses rhamnolipid as a surfactant, the foam richness is not as good as that of most anionic surfactants and zwitterionic surfactants from petrochemical sources. However, by combining rhamnolipid with surfactants from petrochemical sources, the shortcoming of poor foam richness when rhamnolipid is used alone can be effectively made up for, and the final product shows good foamability with a dense and rich foam texture. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 This is a foam performance diagram of Example 1 of the present invention;

[0026] Figure 2 This is a foam performance diagram of Example 2 of the present invention;

[0027] Figure 3 This is a foam performance diagram of Example 3 of the present invention;

[0028] Figure 4 This is a foam performance diagram of Example 4 of the present invention;

[0029] Figure 5 The figure shows the foam quality map before and after adding rhamnolipid in the present invention. DETAILED DESCRIPTION

[0030] The following examples are provided for a better understanding of the present invention, but are not intended to limit the best mode of implementation, nor to limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts shall fall within the protection scope of the present invention.

[0031] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[0032] The sources of raw materials used in the following examples and comparative examples are as follows: rhamnolipid was purchased from Wanhua Chemical, sodium laureth sulfate, cocamidopropyl betaine, alkyl glucoside, and phenoxyethanol were all purchased from BASF, sodium cocoyl isethionate was purchased from Yuantairun, sodium cocoyl isethionate and piroctone olamine salt were purchased from Klein, sodium lauroyl sarcosinate was purchased from Croda, sodium methyl cocoyl taurate, sodium cocoyl glutamate, and disodium lauryl sulfosuccinate were purchased from Kao of Japan, chitosan, hydrolyzed collagen, and hydrolyzed keratin were purchased from CITIC Chemical, sodium chloride and citric acid were purchased from Sinopharm, sodium xylene sulfonate and sodium benzoate were purchased from Aladdin, cationic guar gum, PQ-10, and PQ-7 were purchased from Dow Chemical, and methylisothiazolinone was purchased from Bioao Chemical.

[0033] Example 1: Effect of rhamnolipid on transparency improvement.

[0034] This example shows that replacing the original petrochemical-derived surfactant in the formula with rhamnolipid significantly improves the defect of poor transparency when the petrochemical-derived anionic / zwitterionic / nonionic surfactants are used in combination with cationic conditioners. All concentrations in the application examples are given in mass percentages, and the raw material composition is shown in Table 1.

[0035] Table 1

[0036]

[0037] Weigh the surfactant in accordance with the parts by mass in the above table, add it to a water bath, heat and stir until it is completely dissolved at 70 °C, cool to 50 °C, add the pre-dispersed cationic conditioner and stir evenly. After returning to room temperature, adjust the pH to 6.3 with citric acid (the pH value range of conventional shampoo is 5.5 - 6.5), and make up the water to 100 parts by mass to obtain the shampoo. The following shampoo formulations are also prepared by this process.

[0038] Centrifuge the shampoo samples prepared in Comparative Example 1a, Comparative Example 1d, and Example 1a - d at 5000 rpm for 5 min to defoam, and then use an ultraviolet-visible spectrophotometer. Select a wavelength of 420 nm, use deionized water as the reference sample to measure the transparency of the shampoo. Each sample is measured 3 times repeatedly, and the average value is taken. The test data are shown in Table 2 below.

[0039] Table 2

[0040]

[0041] To alleviate the frizzy and dry problems of hair caused by damage, more cationic conditioners (such as cationic guar gum, PQ-10, PQ-7, etc.) are added to the shampoo and adsorbed on the surface of damaged hair through electrostatic action. However, an increase in the cation addition amount will reduce the transparency of the system and also bring a greasy and uncomfortable washing feeling. Therefore, the addition amount of the cationic conditioner is preferably 0.01 - 0.5%. After using rhamnolipid in the shampoo of the present invention having a cationic conditioner, a significant improvement in transparency can be brought. The reason why the present invention can improve the transparency of the system may be that the sugar ring and dissociated carboxyl group in the rhamnolipid structure can effectively change the charge density and binding state of the system, avoid salting out, and reduce the transparency loss caused by the increase in the cation addition amount.

[0042] Specifically, as can be seen from Table 1 - Table 2 above, in different shampoo formulations, when the added mass ratio of rhamnolipid ≥ 0.5%, the purpose of improving the transparency of the system can be achieved. When the addition amount of the cationic conditioner is relatively large (for example: Comparative Example 1d), insoluble flocculates will precipitate, and the transparency of the system will be significantly reduced. At this time, adding a small amount of rhamnolipid can bring a significant improvement in transparency; combined with Example 1a - c, it can be seen that the preferred addition amount of rhamnolipid is 2 - 8%, and good transparency can still be maintained when the level of the conditioner in the system is relatively high. In summary, when adding rhamnolipid to the shampoo having a cationic conditioner in the present invention, the effect of improving transparency can be achieved; when the rhamnolipid and the cationic conditioner are within the preferred ranges disclosed in the present invention, the effect of significantly improving transparency can be achieved.

[0043] Example 2-4: The effect of rhamnolipid on improving the transparency in shampoo formulations.

[0044] The specific settings of the shampoo formulations in each example are shown in Tables 3-5. Table 3 shows the specific ratio of the shampoo formulation in Example 2, Table 4 shows the specific ratio of the shampoo formulation in Example 3, and Table 5 shows the specific ratio of the shampoo formulation in Example 4.

[0045] Table 3

[0046]

[0047] Table 4

[0048]

[0049] Table 5

[0050]

[0051] The preparation method of the shampoo samples in the above tables is the same as that in Example 1.

[0052] The transparency detection method is as follows:

[0053] Centrifuge the shampoo samples prepared in the above examples and comparative examples at 5000 rpm for 5 min to remove bubbles, and then use an ultraviolet-visible spectrophotometer. Select a wavelength of 420 nm and use deionized water as the reference sample to measure the transparency of the shampoo. Each sample is measured 3 times repeatedly, and the average value is taken. The test data are shown in Table 6 below.

[0054] Table 6

[0055]

[0056] According to the data in Table 6, it can be concluded that the transparency of the combination formulations of the rhamnolipid and other surfactants, including at least one of anionic surfactants, zwitterionic surfactants, and nonionic surfactants, has been improved to varying degrees due to the addition of rhamnolipid.

[0057] More notably, a surfactant combination with overly strong irritation can affect the integrity of the lipid barrier in the skin's stratum corneum, causing partial removal of natural moisturizing factors and enhancing the possibility of penetration of irritating chemicals into the epidermis, thereby leading to problems such as skin inflammation and itching. Currently, existing solutions usually involve increasing the proportion of zwitterionic surfactants / nonionic surfactants or surfactants with low red blood cell (RBC) test data in the system to reduce the risk of irritation that shampoo may cause to the scalp. In the present invention, rhamnolipid is more green and natural in source and the product itself is mild and non-irritating, and it will not cause hemolysis, swelling and denaturation of zein. Therefore, adding rhamnolipid to the shampoo system not only improves transparency but also significantly reduces the risk of irritation that shampoo may cause to the scalp, and is particularly suitable for people with sensitive scalps.

[0058] Test Examples 1-3: Improvement effect of rhamnolipid on the overall washing feel in shampoo formulations.

[0059] Samples of the shampoo formulations disclosed in Examples 1-4 were used for testing sensory-related properties (overall washing feel). The test items included: foam volume and foam stability, combing feel during wet hair process, dry hair detangling and conditioning performance, shampoo irritation, etc.; the above test items are particularly important for consumers and are all consideration indicators of the present invention. The following evaluations were made on each test item.

[0060] Test 1: Evaluation of foam performance:

[0061] Use hard water to prepare 100 g of a 5% aqueous solution of the shampoo sample in a soymilk machine. After high-speed stirring for 30 s and whipping twice, immediately pour the foam into a graduated cylinder, record the initial foam volume and the foam volume after 5 min, and repeat the test 3 times for each sample and take the average value.

[0062] When rhamnolipid is used alone, its foam performance is not good (the foam performance is between that of zwitterionic surfactants and nonionic surfactants), and the foam stability is poor. From the Figures 1 - 4 data results, it can be seen that according to the solution of the present invention, when rhamnolipid is combined with other petrochemical-derived surfactants and cationic conditioners, it will not cause a decrease in foam volume and loss of foam stability performance, but instead will increase the foam stability performance of the formulation. And according to Figure 5 it can be intuitively found that the addition of rhamnolipid can also effectively improve the density of the foam. It can be seen with the naked eye that the foam pores become smaller and more uniform, which can bring a more delicate washing and care feeling. Fine foam can be understood as the number of initial bubbles per square millimeter in the system. Because rhamnolipid contains a longer carbon chain and the steric effect of the sugar ring makes the foam size formed in the system smaller, macroscopically resulting in an increase in foam density and an increase in fineness.

[0063] Test 2: Evaluation of combing performance:

[0064] A 50-cm-long human hair piece was selected to simulate the shampooing process. Before the operation, it was cleaned with a 10% aqueous solution of sodium dodecyl sulfate (K12) to remove the dirt on the hair surface. 5 mL of the shampoo sample was evenly applied to both the front and back sides of the hair piece and gently rubbed for 1 min. After rubbing, the hair piece was rinsed with tap water for 1 min, and then the excess water was filtered off by clamping the hair piece with the index finger and middle finger from top to bottom for the wet combability test. The processed hair piece was hung on the combing instrument, and the teeth of the wooden comb on the combing instrument passed through the hair piece evenly. The hair piece was fixed with a rubber band to prevent it from leaving the comb. The start button was pressed, and the wooden comb was combed from the root part to the end part of the hair piece, and the friction force during the combing process was recorded. Each sample was tested 3 times, the data was recorded, and the average value was taken. After the hair piece was taken down and left standing overnight at a temperature of 25 °C and a humidity of 60%, its dry combing performance was measured by the same method as above. The test results of wet combing performance and dry combing performance are shown in Table 7 below.

[0065] Table 7

[0066]

[0067] Combined with the data in Table 7, it can be seen that cationic conditioners can effectively improve the combability of hair, reduce the generation of hair static electricity, and give hair a better smooth feeling. However, excessive accumulation of cationic conditioners will bring a greasy feeling of incomplete cleaning. By setting the optimal content of each component in the shampoo prepared by the present invention, and introducing rhamnolipid to change the electric property of the surfactant micelles bound to the molecular chain segment of the cationic conditioner, and adjusting the charge density of the shampoo system through the process of the conversion of the anionic-nonionic structure of rhamnolipid in the formula, the excessive action of the cationic conditioner to form flocculation and its accumulation on the hair and scalp are avoided. At the same time, the shampoo of the present invention shows an appropriate cleaning feeling, and can balance the greasy feeling caused by the residue of cationic conditioner and the smooth feeling lacking combability from the source.

[0068] Test 3: Evaluation of irritation:

[0069] The skin closed patch test was adopted, and qualified patch test devices with an area not exceeding 50 mm 2 and a depth of about 1 mm were selected. 15 qualified subjects were selected for each example to participate in the test. The experimental product was placed in the small chamber of the patch test device, and the dosage was about 0.020 mL - 0.025 mL. The patch test device with the test substance was applied to the flexor side of the forearm of the subject with a low-sensitization tape, and gently pressed with the palm to make it evenly applied to the skin for 24 h. The skin reaction was observed for 24 hours according to the skin reaction grading standard of the skin closed patch test.

[0070] When the skin reaction is +, it indicates no adverse reaction; when the skin reaction is ++, it means that a small amount of irritation can be felt, but no adverse reaction occurs; when the skin reaction is +++, it means that a strong irritation can be felt, but no adverse reaction occurs; when the skin reaction is ++++, it means that a strong irritation can be felt and an adverse reaction occurs.

[0071] The evaluation results of the irritation of each example and comparative example are shown in Table 8 below.

[0072] Table 8

[0073]

[0074] The skin reactions of the shampoo provided by the present invention are all +, indicating that it has the effects of being mild, safe, and non-irritating to the skin.

[0075] Obviously, the above examples are only for illustration and are not intended to limit the implementation. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementations here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An application of rhamnolipid in improving the transparency of a daily chemical product with a cationic conditioning agent, wherein the daily chemical product with a cationic conditioning agent comprises a surfactant from a petrochemical source, a cationic conditioning agent, rhamnolipid and deionized water; the pH of the daily chemical product at 25° C. is 2.5-7.5; The added mass proportion of the rhamnolipid in the daily chemical product is ≥0.5%; The added mass proportion of the cationic conditioning agent in the daily chemical product is ≥ 0.01%; Cationic conditioning agents include cationic guar gum; The petrochemical-derived surfactant includes a combination of one or more of anionic surfactants, zwitterionic surfactants, and nonionic surfactants.

2. The use according to claim 1, characterized in that: The cationic conditioning agent further comprises one or more of modified cellulose-based cationic polymers and polysiloxane quaternary ammonium salts.

3. The use according to claim 1 or 2, characterized in that: The daily chemical product is shampoo.

4. The use according to claim 3, characterized in that: The cationic conditioning agent is added to the shampoo in an amount of 0.01-0.4% by weight.

5. The use according to claim 1, characterized in that: The anionic surfactant is added to the shampoo in an amount of 1-40% by mass; And / or, the zwitterionic surfactant is added to the shampoo in an amount of 0.1-45% by mass; And / or, the nonionic surfactant is added to the shampoo in an amount of 0.1-30% by weight.

6. The use according to claim 1, characterized in that: The anionic surfactant is added to the shampoo in an amount of 4-20% by mass; And / or, the zwitterionic surfactant is added to the shampoo in an amount of 1-20% by mass; And / or, the nonionic surfactant is added to the shampoo in an amount of 1-10% by weight; And / or, the mass proportion of the rhamnolipid added to the shampoo is 2-8%.

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