Hair styling spray compositions and methods for making same

Abstract

The present application relates to a water-soluble epoxy-terminated block copolymer, its preparation method and application, a hair styling composition and a corresponding hair styling spray and its use. By designing and synthesizing a water-soluble polymer with polyoxyethylene segments and polydimethylsiloxane segments arranged alternately, the water-soluble polymer is dispersed in water to play the effect of thickening, emulsification and rheological additive, which is beneficial to the atomization effect of the subsequent hair styling composition. In addition, the two ends of the water-soluble polymer are retained with epoxy groups, which can be cured and crosslinked with phenolic hydroxyl groups or carboxyl groups under heating conditions. The polymer film obtained by curing has better styling ability for hair, excellent mechanical properties, does not affect the gloss of hair, has better water resistance, can maintain the bonding ability between hair and the gloss of hair under the condition of soaking in water, and has higher reliability in actual use.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cosmetics, in particular relates to a water-soluble epoxy-terminated block copolymer and a preparation method and application thereof, a hair styling composition and a corresponding hair styling spray and use thereof, and a method for treating hair using the above hair styling composition or spray. BACKGROUND

[0002] The current hair styling spray, hair conditioner, styling foam or gel for enhancing the hair setting power is a non-polar long-chain hydrocarbon, such as a saturated or unsaturated hydrocarbon compound, for example, a liquid oil, a wax or a wax dispersion, etc. The use of a large amount of long-chain hydrocarbon components results in a very greasy, heavy appearance of the hair, and the appearance is obviously insufficient in gloss. The rheological properties of the water solution can be improved, the atomization effect and the gloss on the hair can be increased by using a water-soluble polymer (such as polyacrylate, polyvinylpyrrolidone, etc.) having a thickening effect, but the setting power is poor, the adhesion between the hairs is insufficient, and the setting fails easily under the action of sweat.

[0003] Based on the current technical background, it is necessary to develop a water-soluble polymer and a corresponding hair styling composition. The water-soluble polymer requires a corresponding rheological improvement effect, so that the water solution is easy to atomize and wet and level on the hair surface, and the polymer film formed after solidification on the hair surface has good adhesion to the hair, is easy to set and maintain, and has high gloss. In addition, the hair styling composition can be quickly solidified to form a polymer film with excellent water resistance after being sprayed and heated by a hair dryer, which can resist the immersion of sweat and avoid setting failure. Such a water-soluble polymer and a water-soluble polyphenol are used in a hair styling spray, which has the advantages of convenient use and can be sprayed at any time. SUMMARY

[0004] In view of the defects of the prior art, the technical problem to be solved by the present application is to provide a water-soluble epoxy-terminated block copolymer and a preparation method thereof. The water-soluble epoxy-terminated block copolymer is combined with a water-soluble polyphenol to be used as a film-forming component in a hair styling composition. The hair styling composition can be used as a raw material to prepare an atomizable hair styling spray.

[0005] The present application is realized by the following technical solutions:

[0006] In a first aspect, a water-soluble epoxy-terminated block copolymer has the following structural formula:

[0007] ; wherein a, b, and c are mutually independent and are positive integers greater than 0.

[0008] Preferably, the weight average molecular weight M w of the water-soluble end epoxy group block copolymer is 5000-20000, the number average molecular weight M n is 2000-8000, and the polydispersity index PDI is 1.5-3.0.

[0009] More preferably, the weight average molecular weight M w of the water-soluble end epoxy group block copolymer is 8000-16000, the number average molecular weight M n is 4000-8000, and the polydispersity index PDI is 1.8-3.0.

[0010] In a second aspect, the method for preparing the water-soluble end epoxy group block copolymer described above comprises: using polyethylene glycol diglycidyl ether and α, ω-dihydroxy polydimethylsiloxane to perform ring-opening reaction to obtain;

[0011] The molecular weight of the polyethylene glycol diglycidyl ether is 400-4000, preferably the molecular weight of the polyethylene glycol diglycidyl ether is 400-2000, and more preferably the molecular weight of the polyethylene glycol diglycidyl ether is 400-1000.

[0012] The molecular weight of the α, ω-dihydroxy polydimethylsiloxane is 500-5000, preferably the molecular weight of the α, ω-dihydroxy polydimethylsiloxane is 500-2000, and more preferably the molecular weight of the α, ω-dihydroxy polydimethylsiloxane is 1000-2000.

[0013] The catalyst for the ring-opening reaction is an inorganic base and an alkyl ammonium halide salt, the inorganic base is selected from any one of NaOH or KOH, and the alkyl ammonium halide salt is selected from any one of tetrabutylammonium chloride or tetrabutylammonium bromide.

[0014] Preferably, the inorganic base is prepared into a 1-50 wt% aqueous solution for use.

[0015] Further, the method for preparing the water-soluble end epoxy group block copolymer comprises the following specific steps:

[0016] S1, dissolving and mixing the reactants, i.e. polyethylene glycol diglycidyl ether, inorganic base, alkyl ammonium halide salt, and α, ω-dihydroxy polydimethylsiloxane, using a solvent;

[0017] S2, heating the reaction mixture of S1 to 80-120°C to perform reaction;

[0018] S3, washing the crude product after reaction using a mixed organic solvent, and separating the organic phase;

[0019] S4, removing the residual solvent and water in the reaction system using vacuum distillation and vacuum drying, respectively.

[0020] Preferably, in step S1, the polyethylene glycol diglycidyl ether, inorganic base, alkyl ammonium halide salt and solvent are mixed uniformly at 40-80℃, and then the α,ω-dihydroxyl polydimethylsiloxane is added and mixed.

[0021] Preferably, in step S1, the solvent is any one or more of acetone, tetrahydrofuran and N,N-dimethylformamide.

[0022] Preferably, in step S2, the reaction time is 4-24h.

[0023] Preferably, in step S3, the mixed organic solvent is n-hexane and acetone, and the volume ratio is preferably 2:1.

[0024] In a third aspect, the use of the water-soluble epoxy-terminated block copolymer described above in the preparation of a hair treatment composition.

[0025] In a fourth aspect, a hair styling composition comprises: the water-soluble epoxy-terminated block copolymer described above, a water-soluble polyphenol and water.

[0026] Preferably, the water-soluble polyphenol is selected from any one of tannic acid, dopamine or polydopamine.

[0027] Further, the hair styling composition further comprises a C6-C20 fatty acid, preferably, the fatty acid is selected from any one of stearic acid or lauric acid.

[0028] Further, the hair styling composition further comprises a polyol, preferably, the polyol is selected from one or more of propylene glycol, glycerol, 1,3-butanediol and monoglyceride.

[0029] Further, the hair styling composition further comprises a neutralizing agent, preferably, the neutralizing agent is any one of sodium hydroxide or sodium bicarbonate.

[0030] Further, the hair styling composition further comprises a preservative, preferably, the preservative is selected from any one of benzoic acid and its salts or sorbic acid and its salts.

[0031] Further, the hair styling composition is composed of the following components in mass percentage: water-soluble epoxy-terminated block copolymer 5-15%, polyphenol 0.5-3.0%, polyol 1-10%, stearic acid 0.1-2.0%, neutralizing agent 0.1-2.0%, preservative 0.1-2.0%, and the rest is made up to 100% with water.

[0032] Preferably, the hair styling composition is composed of the following components in mass percentage: water-soluble epoxy-terminated block copolymer 8-12%, polyphenol 0.5-2.0%, polyol 1-10%, stearic acid 0.1-2.0%, neutralizing agent 0.1-2.0%, preservative 0.1-2.0%, and the rest is made up to 100% with water.

[0033] More preferably, the hair styling composition is composed of the following components in mass percentage: water-soluble epoxy-terminated block copolymer 10-12%, polyphenol 1.0-2.0%, polyol 1-10%, stearic acid 0.1-2.0%, neutralizing agent 0.1-2.0%, preservative 0.1-2.0%, and the rest is made up to 100% with water.

[0034] In a fifth aspect, a hair styling spray is prepared from the hair styling composition described above.

[0035] Further, the preparation method specifically comprises: first dissolving the water-soluble epoxy-terminated block copolymer in water using mechanical stirring, and then adding the remaining components of the composition formula for mixing, thereby obtaining the hair styling composition.

[0036] Preferably, the water is deionized water.

[0037] Preferably, the rotation speed of the mechanical mixing is 100-1000 rpm.

[0038] Preferably, the temperature of the mechanical mixing is room temperature to 60°C.

[0039] Preferably, the time of the mechanical mixing is 1-60 min.

[0040] In a sixth aspect, the use of the hair styling composition and / or the hair styling spray described above for treating hair.

[0041] In a seventh aspect, a method for treating hair, comprising: applying the hair styling composition and / or the hair styling spray described above to the hair by spraying, and then heating the hair, the heating temperature being 40-100°C.

[0042] Preferably, the hair is heated using a hair dryer.

[0043] Preferably, the heating time is 30-120 s, and more preferably, the heating time is 60-120 s.

[0044] The present application has the beneficial effects of designing and synthesizing a water-soluble polymer with polyoxyethylene segments and polydimethylsiloxane segments arranged alternately, which is dispersed in water to play the effects of thickening, emulsifying and rheological additive, and is beneficial to the atomization effect of the subsequent hair styling composition. In addition, the water-soluble polymer retains epoxy groups at both ends, which can be cured and crosslinked with phenolic hydroxyl groups or carboxyl groups under heating conditions. The polymer film obtained by curing has better styling ability for hair, excellent mechanical properties, does not affect the gloss of hair, has better water resistance, can maintain the bonding ability between hair and the gloss of hair under the condition of soaking in water, and has higher reliability in actual use. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 ATR-FTIR spectrum of the water-soluble epoxy-terminated block copolymer prepared in Example 4.

[0046] Figure 2 Molecular weight distribution graph of the water-soluble epoxy-terminated block copolymer prepared in Example 1.

[0047] Figure 3 Molecular weight distribution graph of the water-soluble epoxy-terminated block copolymer prepared in Example 2.

[0048] Figure 4 Molecular weight distribution graph of the water-soluble epoxy-terminated block copolymer prepared in Example 3.

[0049] Figure 5 Molecular weight distribution graph of the water-soluble epoxy-terminated block copolymer prepared in Example 4. DETAILED DESCRIPTION

[0050] The application will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the application and not intended to limit the scope of the application. Furthermore, it should be understood that those skilled in the art can make various modifications or changes to the application after reading the content taught by the application, and these equivalent forms also fall within the scope of the appended claims.

[0051] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of the features, steps, operations, devices, components and / or combinations thereof.

[0052] If the experimental specific conditions are not specified in the examples, they are generally in accordance with the conventional conditions in the art, or in accordance with the conditions recommended by the reagent company; the materials, reagents, etc. used in the examples can be purchased through commercial channels, unless otherwise specified.

[0053] Example 1

[0054] Synthesis of water-soluble epoxy-terminated block copolymer, polyethylene glycol diglycidyl ether (Sigma-Aldrich) with molecular weight of 500, 16.5 g (0.033 mol), 100 mL of acetone, 1 g of 30 wt% NaOH aqueous solution, and 1 g of tetrabutylammonium bromide (TBAB) were added to a flask, and stirred uniformly at 65°C under reflux condensation for 30 min, then α, ω-dihydroxypolydimethylsiloxane with average degree of polymerization of 20 and molecular weight of 1500, 22.5 g (0.015 mol) and 100 mL of n-hexane were added, and the temperature was raised to 85°C for reaction for 6 h, after the reaction was completed, the temperature was lowered to room temperature, the reaction product was washed with n-hexane / acetone mixed solvent with a volume ratio of 2:1 for 3 times to remove the unreacted reactants and catalysts TBAB and NaOH, and finally rotary evaporation was carried out at 50°C to remove the solvents n-hexane and acetone, and finally vacuum drying was carried out at 80°C and a vacuum degree of 0.8 torr for 8 h to obtain the water-soluble epoxy-terminated block copolymer.

[0055] The molecular weight and molecular weight distribution of the water-soluble epoxy-terminated block copolymer were tested by GPC, and the water-soluble epoxy-terminated block copolymer prepared in Example 1 had M w = 13457, M n = 6124, PDI = 2.20.

[0056] Example 2

[0057] Synthesis of water-soluble epoxy-terminated block copolymer, polyethylene glycol diglycidyl ether (Sigma-Aldrich) with molecular weight of 500, 16.5 g (0.033 mol), 100 mL of acetone, 1 g of 30 wt% NaOH aqueous solution, and 1 g of tetrabutylammonium bromide (TBAB) were added to a flask, and stirred uniformly at 65°C under reflux condensation for 30 min, then α, ω-dihydroxypolydimethylsiloxane with average degree of polymerization of 20 and molecular weight of 1500, 22.5 g (0.015 mol) and 100 mL of n-hexane were added, and the temperature was raised to 85°C for reaction for 6 h, after the reaction was completed, the temperature was lowered to room temperature, the reaction product was washed with n-hexane / acetone mixed solvent with a volume ratio of 2:1 for 3 times to remove the unreacted reactants and catalysts TBAB and NaOH, and finally rotary evaporation was carried out at 50°C to remove the solvents n-hexane and acetone, and finally vacuum drying was carried out at 80°C and a vacuum degree of 0.8 torr for 8 h to obtain the water-soluble epoxy-terminated block copolymer.

[0058] The molecular weight and molecular weight distribution of the water-soluble epoxy-terminated block copolymer were tested by GPC, and the water-soluble epoxy-terminated block copolymer prepared in Example 1 had M w = 10703, M n = 5292, PDI = 2.02.

[0059] Example 3

[0060] The synthesis of water-soluble epoxy-terminated block copolymer, polyethylene glycol diglycidyl ether (Sigma-Aldrich) with molecular weight of 2000, 70 g (0.035 mol), 100 mL of acetone, 1 g of 30 wt% NaOH aqueous solution and 1 g of tetrabutyl ammonium bromide (TBAB) were added into a flask, stirred uniformly at 65 °C under reflux condensation for 30 min, then α,ω-dihydroxypolydimethylsiloxane with average degree of polymerization of 20 and molecular weight of 1500, 22.5 g (0.015 mol) and 100 mL of n-hexane were added, the temperature was raised to 85 °C and reacted for 6 h, after the reaction was completed, the temperature was lowered to room temperature, the reaction product was washed with n-hexane / acetone mixed solvent with volume ratio of 2:1 for 3 times to remove the unreacted reactants and catalysts TBAB and NaOH, then rotary evaporation was carried out at 50 °C to remove the solvents n-hexane and acetone, and finally vacuum drying was carried out at 80 °C and vacuum degree of 0.8 torr for 8 h to obtain the water-soluble epoxy-terminated block copolymer.

[0061] The molecular weight and molecular weight distribution of the water-soluble epoxy-terminated block copolymer were tested by GPC, the water-soluble epoxy-terminated block copolymer prepared in Example 1 had M w = 14699, M n = 6216, PDI = 2.36.

[0062] Example 4

[0063] The synthesis of water-soluble epoxy-terminated block copolymer, polyethylene glycol diglycidyl ether (Sigma-Aldrich) with molecular weight of 500, 80 g (0.04 mol), 100 mL of acetone, 1 g of 30 wt% NaOH aqueous solution and 1 g of tetrabutyl ammonium bromide (TBAB) were added into a flask, stirred uniformly at 65 °C under reflux condensation for 30 min, then α,ω-dihydroxypolydimethylsiloxane with average degree of polymerization of 20 and molecular weight of 1500, 22.5 g (0.015 mol) and 100 mL of n-hexane were added, and the rest of the operation was the same as that in Example 3.

[0064] The water-soluble epoxy-terminated block copolymer prepared in Example 4 was characterized by ATR-FTIR, and the corresponding infrared spectrum is shown in Figure 1 .

[0065] The molecular weight and molecular weight distribution of the water-soluble epoxy-terminated block copolymer were tested by GPC, the water-soluble epoxy-terminated block copolymer prepared in Example 1 had M w = 13427, M n = 5400, PDI = 2.49.

[0066] Example 5

[0067] A hair styling spray composition, by mass percent, comprising: the water-soluble epoxy-terminated block copolymer prepared in Example 1 10%, tannic acid 1.0%, stearic acid 0.5%, propylene glycol 3.0%, glyceryl monostearate 1.5%, sodium bicarbonate 0.7%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0068] Example 6

[0069] A hair styling spray composition, by mass percent, comprising: the water-soluble epoxy-terminated block copolymer prepared in Example 1 11%, tannic acid 1.5%, stearic acid 1.0%, propylene glycol 3.0%, glyceryl monostearate 1.0%, sodium bicarbonate 0.8%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0070] Example 7

[0071] A hair styling spray composition, by mass percent, comprising: the water-soluble epoxy-terminated block copolymer prepared in Example 2 10%, tannic acid 1.0%, lauric acid 0.5%, 1,3-butanediol 3.0%, glyceryl monostearate 1.5%, sodium bicarbonate 0.7%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0072] Example 8

[0073] A hair styling spray composition, by mass percent, comprising: the water-soluble epoxy-terminated block copolymer prepared in Example 2 11%, tannic acid 1.5%, lauric acid 1.0%, 1,3-butanediol 3.0%, glyceryl monostearate 1.0%, sodium bicarbonate 0.8%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0074] Example 9

[0075] A hair styling spray composition, by mass percent, comprising: the water-soluble epoxy-terminated block copolymer prepared in Example 3 10%, tannic acid 1.0%, stearic acid 0.5%, propylene glycol 3.0%, glyceryl monostearate 1.5%, sodium bicarbonate 0.7%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0076] Example 10

[0077] A hair styling spray composition, by mass percent, comprising: the water-soluble epoxy-terminated block copolymer prepared in Example 3 11%, tannic acid 1.5%, stearic acid 1.0%, propylene glycol 3.0%, glyceryl monostearate 1.0%, sodium bicarbonate 0.8%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0078] Example 11

[0079] A hair styling spray composition, by mass percent, comprising: the water-soluble epoxy-terminated block copolymer prepared in Example 4 10%, tannic acid 1.0%, lauric acid 0.5%, 1,3-butanediol 3.0%, glyceryl monostearate 1.5%, sodium bicarbonate 0.7%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0080] Example 12

[0081] A hair styling spray composition, by mass percent, comprising: the water-soluble epoxy-terminated block copolymer prepared in Example 4 11%, tannic acid 1.5%, lauric acid 1.0%, 1,3-butanediol 3.0%, glyceryl monostearate 1.0%, sodium bicarbonate 0.8%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0082] Comparative Example 1

[0083] A hair styling spray composition, by mass percent, comprising: polyethylene glycol dilaurate (PEG-32) 10%, tannic acid 1.0%, lauric acid 0.5%, propylene glycol 3.0%, glyceryl monostearate 1.5%, sodium bicarbonate 0.7%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0084] Comparative Example 2

[0085] A hair styling spray composition, by mass percent, comprising: an alpha, omega-dihydroxypolydimethylsiloxane having an average degree of polymerization of 20 and a number average molecular weight of 1500 10%, tannic acid 1.0%, lauric acid 0.5%, 1,3-butanediol 3.0%, glyceryl monostearate 1.5%, sodium bicarbonate 0.7%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0086] Comparative Example 3

[0087] A hair styling spray composition, by mass percent, comprising: polyethylene glycol diglycidyl ether having a molecular weight of 2000 10%, tannic acid 1.0%, lauric acid 0.5%, 1,3-butanediol 3.0%, glyceryl monostearate 1.5%, sodium bicarbonate 0.7%, sodium sorbate 1.0%, and the balance made up to 100% with deionized water.

[0088] Comparative Example 4

[0089] A hair styling spray composition comprising, by mass percentage, 11% of the water-soluble epoxy-terminated block copolymer prepared in Example 1, 1.0% of stearic acid, 3.0% of propylene glycol, 1.0% of glyceryl monostearate, 0.8% of sodium bicarbonate, 1.0% of sodium sorbate, and the balance made up to 100% with deionized water.

[0090] Preparation of hair styling spray: The high molecular weight component in the compositions of Examples 5-12 and Comparative Examples 1-4 (water-soluble epoxy-terminated block copolymer in Examples 5-12 and Comparative Example 4, polyethylene glycol dilaurate in Comparative Example 1, a, w-dihydroxypolydimethylsiloxane in Comparative Example 2, and polyethylene glycol diglycidyl ether with a molecular weight of 2000 in Comparative Example 3) were mixed with deionized water by mechanical stirring at a rotation speed of 300 rpm for 15 min, and then the remaining other components were mixed and stirred at a rotation speed of 300 rpm for 30 min, thereby preparing the corresponding hair styling spray.

[0091] Newly purchased hair tresses (each 50 hairs tied into a tress) were cut to a size of 180 mm in length and 12.5 mm in width, soaked in a 0.1% NaOH solution for 2 hours, and then the tresses were taken out, washed, and dried. The tresses were then placed in a 50% ethanol solution and soaked for 4 hours, and then the tresses were taken out, washed, and dried. The hair styling spray compositions of Examples 5-12 and Comparative Examples 1-4 were each sprayed onto each tress in an amount of 1 g, and then dried using a hair dryer for 60 s.

[0092] Mechanical property testing: Diastron automatic tensile testing machine was used to test the tresses sprayed with the above styling compositions for their Young's modulus and breaking strength.

[0093] Glossiness testing: A hair glossiness tester of the SAMBA HAIR type was used to test the glossiness of the tresses after being sprayed with the above styling compositions at three angles of -10°, 0°, and 10°.

[0094] Water resistance testing: The tresses sprayed with the above styling compositions were soaked in pure water at (40±2) °C for 1 hour, and then the mechanical property testing and glossiness testing were repeated and the test results were compared.

[0095] The test results for the hair styling sprays of Examples 5-12 and Comparative Examples 1-4 are listed in Table 1.

[0096] Table 1

[0097]

[0098] The analysis of the test data in Table 1 shows that the hair styling spray compositions prepared in Examples 5-12 have better mechanical properties and gloss, enhancing the hair styling ability while maintaining good gloss of the hair. In addition, the water resistance after film formation is excellent, and the mechanical properties and gloss of the hair do not decrease significantly after soaking in water at a temperature of (40±2) °C for 1 hour, which can meet the actual application. Among them, Examples 5-8 use the water-soluble epoxy-terminated block copolymer prepared in Examples 1 or 2, and have better mechanical properties and gloss than Examples 9-12. The reason is that the water-soluble epoxy-terminated block copolymer prepared in Examples 1 and 2 uses polyethylene glycol diglycidyl ether with a molecular weight of 500 as a raw material. Under the condition of close molecular weight, the polymerization degree is higher, the number of hydroxyl groups formed by the ring opening of epoxy groups is more, and after drying by a hair dryer, a higher crosslinking density can be formed, which is beneficial to improve the mechanical properties and gloss of the sprayed hair.

[0099] Comparative Example 1 uses polyethylene glycol dilaurate (PEG-32) instead of water-soluble epoxy-terminated block copolymer. Polyethylene glycol dilaurate lacks epoxy groups that can crosslink with tannic acid and stearic acid, so the mechanical properties of the sprayed hair are significantly lower than those of Examples 5-12.

[0100] Comparative Example 2 does not use water-soluble epoxy-terminated block copolymer, but uses the raw material α,ω-dihydroxy polydimethylsiloxane instead of water-soluble epoxy-terminated block copolymer. α,ω-dihydroxy polydimethylsiloxane lacks epoxy groups that can crosslink with tannic acid and stearic acid, so the mechanical properties of the sprayed hair are significantly lower than those of Examples 5-12, and the gloss also decreases significantly.

[0101] Comparative Example 3 does not use water-soluble epoxy-terminated block copolymer, but uses polyethylene glycol diglycidyl ether with a molecular weight of 2000 instead of water-soluble epoxy-terminated block copolymer. Polyethylene glycol diglycidyl ether can achieve crosslinking with tannic acid and stearic acid, but lacks polydimethylsiloxane segments that easily expose hydrophilic groups such as hydroxyl and carboxyl groups, resulting in poor water resistance of the hair styling spray. After soaking in water at a temperature of (40±2) °C for 1 hour, the mechanical properties decrease significantly.

[0102] Comparative Example 4 does not use tannic acid, and the water-soluble epoxy-terminated block copolymer lacks a crosslinking agent to react with the epoxy groups. Tannic acid can provide a large number of phenolic hydroxyl groups to crosslink with the epoxy groups during the blowing process of the hair dryer, improving the mechanical properties of the hair styling spray after curing. The lack of tannic acid results in mechanical properties of the sprayed hair that are significantly lower than those of Examples 5-12.

[0103] Finally, it should be noted that the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although with reference to the foregoing embodiments of the present application has been described in detail, for those skilled in the art, still can be modified, or part of the equivalent replacement of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included within the scope of the present application. Although the above describes the specific embodiments of the present application, but not the limitation of the scope of protection of the present application, the skilled in the art should be clear that, on the basis of the technical solutions of the present application, the skilled in the art without the need for creative labor can make various modifications or deformation still within the scope of the present application.

Claims

1. A hair styling composition, characterized in that, The hair styling composition comprises: a water-soluble terminal epoxy block copolymer, a water-soluble polyphenol, and water; The structural formula of the water-soluble terminal epoxy block copolymer is as follows: Where a, b, and c are independent and are positive integers greater than 0. The water-soluble polyphenols are selected from any one of tannic acid, dopamine, or polydopamine.

2. The hair styling composition according to claim 1, characterized in that, The hair styling composition includes C6-C20 fatty acids; And / or, the hair styling composition comprises a polyol; And / or, the hair styling composition includes a neutralizing agent; And / or, the hair styling composition further includes a preservative.

3. The hair styling composition according to claim 1, characterized in that, The hair styling composition comprises the following components in weight percentages: 5-15% of the water-soluble terminal epoxy block copolymer as described in claim 1, 0.5-3.0% of the water-soluble polyphenol, 1-10% of the polyol, 0.1-2.0% of the stearic acid, 0.1-2.0% of the neutralizer, 0.1-2.0% of the preservative, and the remainder is made up to 100% with water.

4. The hair styling composition according to claim 1, characterized in that, The water-soluble terminal epoxy block copolymer is prepared by performing a ring-opening reaction between polyethylene glycol diglycidyl ether and α,ω-dihydroxypolydimethylsiloxane. The molecular weight of the polyethylene glycol diglycidyl ether is 400-4000; the molecular weight of the α,ω-dihydroxypolydimethylsiloxane is 500-5000. The catalyst for the ring-opening reaction is an inorganic base and an alkyl ammonium halide salt, wherein the inorganic base is selected from either NaOH or KOH, and the alkyl ammonium halide salt is selected from either tetrabutylammonium chloride or tetrabutylammonium bromide.

5. The hair styling composition according to claim 4, characterized in that, The specific steps of the method for preparing the water-soluble terminal epoxy group block copolymer include: S1. Dissolve and mix the reactants polyethylene glycol diglycidyl ether, inorganic base, alkyl ammonium halide salt and α,ω-dihydroxypolydimethylsiloxane using a solvent; S2. Heat the reaction mixture of S1 to 80-120℃ to carry out the reaction; S3. Wash the crude product after the reaction with a mixed organic solvent to separate the organic phase; S4. Remove residual solvent and water from the reaction system by vacuum distillation and vacuum drying, respectively.

6. A hair styling spray, characterized in that, The hair styling spray is prepared from the hair styling composition according to any one of claims 1-5.

7. Use of the hair styling composition according to any one of claims 1-5 and / or the hair styling spray according to claim 6, characterized in that, Use of hair styling compositions and / or hair styling sprays for treating hair.

8. A method for treating hair, characterized in that, The hair styling composition according to any one of claims 1-5 and / or the hair styling spray according to claim 6 are applied to the hair by spraying, and then the hair is heated to a temperature of 40-100°C.

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