Natural plant essential oil hair conditioner and preparation method thereof

Abstract

The invention belongs to the technical field of daily chemical products, and particularly relates to a natural plant essential oil hair conditioner and a preparation method thereof.The natural plant essential oil hair conditioner comprises an oil phase system, a water phase system, an active matter adding system and an auxiliary additive which are formed by mixing, and the oil phase system comprises, by weight, 13-17 parts of coconut oil and 23-27 parts of vegetable fat matrix composed of shea butter; the compound emulsifier is prepared from the following components in parts by weight: 11 to 13 parts of ceteareth-20 and 3.7 to 4.3 parts of sorbitan olivate; the water phase system is prepared from 38 to 52 parts of deionized water and 0.55 to 0.65 part of xanthan gum; the active matter adding system is prepared from 2.3 to 2.7 parts of lavender essential oil, 1.4 to 1.6 parts of rosemary essential oil, 0.9 to 1.1 parts of lemon essential oil, 0.05 to 0.1 part of borneol oil and 0.4 to 0.6 part of vitamin E; the auxiliary additive is prepared from the following components in parts by weight: 0.55 to 0.825 part of chitosan-lecithin composite powder, 0.28 to 0.32 part of EDTA (Ethylene Diamine Tetraacetic Acid) disodium salt and 0.48 to 0.52 part of magnesium aluminum silicate. The technical problems that in an existing hair care product, plant essential oil is insufficient in compounding stability, volatile active ingredients are not fully protected, and low-temperature process dispersity is poor are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of daily chemical products, specifically relating to a natural plant essential oil hair conditioner and its preparation method. Background Technology

[0002] With increasing consumer demand for natural and healthy hair care products, the application of plant essential oils in hair care is gradually gaining attention. However, existing hair care products still have many shortcomings when using plant essential oils, especially in terms of the stability of essential oil blends, the protection of volatile active ingredients, and the dispersibility during low-temperature processing, which limits their full efficacy and widespread application.

[0003] CN113633579B discloses a color-locking hair care oil and its preparation method. The color-locking hair care oil comprises bis-aminopropyl polydimethylsiloxane, *Capsella bursa-pastoris* seed oil, *Argania serratifolia* kernel oil, cyclopentamethoxane, a thickener, and a softener. The preparation method is as follows: First, cyclopentamethoxane, *Capsella bursa-pastoris* seed oil, and *Argania serratifolia* kernel oil are mixed and stirred evenly to obtain a mixture; then, a softener is prepared; finally, bis-aminopropyl polydimethylsiloxane, the thickener, and the softener are mixed with the mixture and stirred evenly to obtain the color-locking hair care oil.

[0004] The above issues indicate that existing hair care products have problems with the potential irritation of the scalp to plant essential oils in film-forming agents, insufficient protection of volatile active ingredients, stability of essential oil blends, and dispersibility in low-temperature processes. Summary of the Invention

[0005] To address the problems in existing technologies, this invention provides a natural plant essential oil hair conditioner and its preparation method, solving the technical difficulties of insufficient stability of plant essential oil blends, inadequate protection of volatile active ingredients, and poor dispersibility in low-temperature processes in existing hair care products. This invention aims to meet market demand for efficient, safe, and natural hair care products by optimizing essential oil blending technology, employing low-temperature emulsification processes to protect active ingredients, and achieving stable dispersion of essential oils in oil systems.

[0006] This invention provides a natural plant essential oil hair conditioner, comprising an oil phase system, an aqueous phase system, an active ingredient addition system, and auxiliary additives, in parts by weight. The oil phase system comprises a plant oil matrix and a composite emulsifier. The plant oil matrix comprises 13-17 parts coconut oil and 23-27 parts shea butter. The composite emulsifier comprises 11-13 parts cetearyl alcohol polyether-20 and 3.7-4.3 parts sorbitan olive oil ester. The aqueous phase system comprises: 38-52 parts deionized water and 0.55-0.65 parts xanthan gum; The active ingredient addition system includes: 2.3-2.7 parts lavender essential oil, 1.4-1.6 parts rosemary essential oil, 0.9-1.1 parts lemon essential oil, 0.05-0.1 parts borneol oil, and 0.4-0.6 parts vitamin E; The auxiliary additives include: 0.55-0.825 parts chitosan-lecithin composite powder, 0.28-0.32 parts disodium EDTA, and 0.48-0.52 parts magnesium aluminum silicate.

[0007] In the oil phase system, coconut oil and shea butter serve as the basic oil components, possessing excellent moisturizing and antioxidant properties, respectively, providing long-lasting hydration and repair for the hair. Cetearyl alcohol polyether-20 acts as an oil phase solubilizer, enhancing the dispersibility of plant essential oils in the oil system. The composite emulsifier, through the synergistic effect of cetearyl alcohol polyether-20 and sorbitan olive oil ester, forms a stable bilayer emulsion structure, ensuring uniform dispersion of the oil and aqueous phases under low-temperature conditions and preventing separation.

[0008] In the aforementioned active ingredient addition system, lavender essential oil, rosemary essential oil, borneol oil, and lemon essential oil are blended in a specific ratio to form a stable essential oil combination. Lavender essential oil provides a soothing effect, rosemary essential oil enhances scalp blood circulation, and lemon essential oil regulates sebum secretion. The three work synergistically to achieve a comprehensive hair care effect. Vitamin E, as an antioxidant, is used to delay the oxidation process of the essential oils and enhance the overall stability of the conditioner. Borneol oil provides a cooling sensation and has anti-inflammatory effects.

[0009] This solution also proposes a method for preparing the above-mentioned natural plant essential oil hair conditioner, including the following steps: Oil phase preparation: Mix vegetable oil matrix and composite emulsifier according to the formula, and homogenize to obtain oil phase system; Aqueous phase preparation: Xanthan gum was dissolved in water according to the specified ratio to obtain an aqueous phase system; Emulsification: The oil phase system is slowly added to the aqueous phase system, homogenized and emulsified at 43-47℃, and then slowly cooled to 34-36℃ to obtain an emulsion; Essential oil blending: Mix according to the formula of the active ingredient addition system, and then add auxiliary additives. The order of adding auxiliary additive components is as follows: first add disodium EDTA, then add chitosan-lecithin complex powder, and finally add magnesium aluminum silicate to obtain blended essential oils. Semi-finished product preparation: Mix the emulsion and compound essential oil, adjust the pH to 4.5-5.0, and disperse evenly to obtain the semi-finished product; Finished product preparation: The semi-finished product is treated with negative pressure and then filled to obtain the finished product.

[0010] Preferably, in the oil phase preparation process, a constant temperature water bath environment of 38-47℃ is set up. 23-27 parts of shea butter, 13-17 parts of coconut oil, 11-13 parts of cetearyl alcohol polyether-20, and 3.7-4.3 parts of sorbitan olive oil ester are mixed and melted, and stirred at a stirring rate of 700-900 rpm for 8-12 minutes to ensure that all components are fully dissolved and form a homogeneous oil phase system. In the aqueous phase preparation process, 38-52 parts of deionized water are heated to 38-47℃, and 0.55-0.65 parts of xanthan gum are added and stirred to dissolve, forming a stable aqueous phase system. When the oil phase is slowly added to the aqueous phase, the flow rate is controlled at 4-6 mL / s. After preliminary mixing, the mixture is homogenized using a high-shear homogenizer at 2200-2800 rpm for 10-14 minutes. The particle size distribution is measured using a laser particle size analyzer. 50 =1.0-1.5μm, ensuring the dispersion of emulsion particles.

[0011] Preferably, during the essential oil blending process, 0.28-0.32 parts of disodium EDTA and 0.48-0.52 parts of magnesium aluminum silicate need to be added to adsorb free metal ions; 10-15% of chitosan-lecithin complex powder by weight of the essential oil also needs to be added to assist the essential oil in anti-oxidation, wherein the ratio of chitosan to lecithin is 2:1; in addition, when adding active ingredients, an appropriate amount of citric acid or sodium bicarbonate is added to adjust the pH to maintain the weakly acidic environment of the system and ensure that the essential oil remains stable in the pH range of 4.5-5.0.

[0012] Preferably, when adding auxiliary additives to compound essential oils, the order is as follows: first add disodium EDTA, then add chitosan-lecithin composite powder, and finally add magnesium aluminum silicate. Disodium EDTA preferentially chelates free metal ions in the essential oils, preventing the subsequent coating of chitosan-lecithin composite powder from failing. Magnesium aluminum silicate specifically adsorbs residual ions, avoiding competition for the positive charge of the composite membrane. Disodium EDTA chelates dissolved ions, and magnesium aluminum silicate adsorbs colloidal / precipitated ions, achieving a synergistic effect to achieve high-efficiency removal of metal ions.

[0013] Preferably, in the low-temperature emulsification process, the emulsion temperature is monitored in real time during the homogenization process, and the temperature change is fed back to the water cooling device. The water cooling device adjusts the cooling water flow rate according to the temperature change. When the temperature rises during homogenization, the cooling water flow rate increases to accelerate the removal of the heat generated during homogenization, ensuring that the emulsification process is carried out under optimal conditions, thereby improving the stability and dispersibility of the emulsion.

[0014] Preferably, during the cooling process, the temperature is gradually reduced from 43-47℃ to 34-36℃ at a rate of 0.4-0.6℃ / min. This slow cooling reduces the damage of thermal stress to the emulsion structure and prevents the active ingredients of the essential oil from becoming ineffective due to sudden temperature changes. During the active ingredient addition stage, the essential oil and vitamin E are stirred at 400 rpm for 8 minutes at 34-36℃ to ensure that the active ingredients are evenly dispersed in the emulsion system. During the vacuum degassing process, the emulsion is treated with a negative pressure of -0.07~-0.09MPa for 5 minutes to remove air bubbles and improve the appearance quality and stability of the product. During the filling process, a 30℃ nitrogen-protected filling device is used to control the oxygen content to below 0.5% to prevent the essential oil from oxidizing during storage.

[0015] Preferably, high-purity nitrogen is introduced during the filling process to ensure that the oxygen content remains below 0.5% throughout the filling process.

[0016] Compared to existing technologies, the technical advantages of this solution are: This invention systematically solves the technical bottlenecks of plant essential oil hair care products through three major innovations: composite emulsification system design, active ingredient targeted protection technology, and low-temperature process control. It features stability, high activity retention rate, good safety, and high industrial adaptability, providing a reliable technical path for natural hair care products. Detailed Implementation

[0017] The technical solutions will now be clearly and completely described in conjunction with embodiments of the present invention. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] This invention relates to a natural plant essential oil hair conditioner and its preparation method. The core of this invention lies in achieving excellent retention of active ingredients through a specific ratio of raw materials and an optimized low-temperature emulsification process. The specific embodiments of this invention will be described in detail below with reference to relevant content and examples.

[0019] Example 1

[0020] A method for preparing a natural plant essential oil hair conditioner includes the following steps: Oil phase preparation: 23-27 parts shea butter, 13-17 parts coconut oil, 11-13 parts cetearyl alcohol polyether-20 and 3.7-4.3 parts sorbitan olive oil ester are mixed and melted in a constant temperature water bath at 38-47℃, and stirred at a stirring rate of 700-900 rpm for 8-12 minutes to ensure that all components are fully dissolved and form a homogeneous oil phase system; Aqueous phase preparation: Heat 38-52 parts of deionized water to 38-47℃, add 0.55-0.65 parts of xanthan gum and stir to dissolve, forming a stable aqueous phase system; Emulsification: The oil phase system is slowly added to the aqueous phase system at a flow rate of 4-6 mL / s. After initial mixing at 800 rpm, the mixture is homogenized using a high-shear homogenizer at 2200-2800 rpm for 10-14 min. During homogenization, a water-cooling device is used to control the emulsification process temperature at 43-47℃. The D particle size is measured using a laser particle size analyzer. 50 =1.0-1.5μm, to ensure the dispersion of emulsion particles, and then gradually cool from 43-47℃ to 34-36℃ at a rate of 0.4-0.6℃ / min to obtain an emulsion. The slow cooling reduces the damage of thermal stress to the emulsion structure and avoids the failure of essential oil active ingredients due to sudden temperature changes. Essential oil blend: Following the formula of 2.3-2.7 parts lavender essential oil, 1.4-1.6 parts rosemary essential oil, 0.9-1.1 parts lemon essential oil, 0.05-0.1 parts borneol oil, and 0.4-0.6 parts vitamin E, first stir the lavender and rosemary essential oils at 450-550 rpm for 4-6 minutes. Then add the lemon essential oil and stir at 700-900 rpm for 2-4 minutes. Finally, add the vitamin E and borneol oil at 350-500 rpm. Stir at 450 rpm for 2-3 minutes, then add 0.28-0.32 parts of disodium EDTA to the essential oil mixture and stir at 350-450 rpm for 4-6 minutes. Then add 0.55-0.825 parts of chitosan-lecithin complex powder and shake at 120-180 rpm for 80-100 minutes. Finally, add 0.48-0.52 parts of magnesium aluminum silicate and stir at 550-650 rpm for 7-9 minutes to obtain the compound essential oil. Semi-finished product preparation: Add compound essential oil to a homogenized emulsion with the temperature reduced to below 34-36℃, and slowly add 10% citric acid solution at 2mL / s to adjust the pH to 4.5-5.0. Stir at 400rpm for 8min to ensure that the active ingredients are evenly dispersed in the emulsion system to obtain the semi-finished product. Finished product preparation: The semi-finished product is subjected to negative pressure treatment of -0.07~-0.09MPa for 5 minutes to remove air bubbles in the emulsion, improve the appearance quality and stability of the product. During the filling process, high-purity nitrogen is introduced to control the oxygen content to be below 0.5% to prevent the essential oil from oxidizing during storage, thus obtaining the finished product.

[0021] Example 2

[0022] A natural plant essential oil hair conditioner and its preparation method, comprising the following steps: Oil phase preparation: 25 parts shea butter, 15 parts coconut oil, 12 parts cetearyl alcohol polyether-20 and 4 parts sorbitan olive oil ester were mixed and melted in a constant temperature water bath at 43°C and stirred at a stirring rate of 800 rpm for 10 min to ensure that each component was fully dissolved and formed a homogeneous oil phase system. Aqueous phase preparation: 45 parts of deionized water were heated to 43°C, and 0.6 parts of xanthan gum were added and stirred to dissolve, forming a stable aqueous phase system; Emulsification: The oil phase system was slowly added to the aqueous phase system at a flow rate of 5 mL / s. After initial mixing at 800 rpm, the mixture was homogenized at 2500 rpm for 12 min using a high-shear homogenizer. During homogenization, a water-cooling device was used to control the emulsification process temperature at 45℃. The D particle size was measured using a laser particle size analyzer. 50 =1.2μm, to ensure the dispersion of emulsion particles, and gradually cool from 43-47℃ to 34-36℃ at a rate of 0.5℃ / min to obtain emulsion; Essential oil blend: According to the formula of 2.5 parts lavender essential oil, 1.5 parts rosemary essential oil, 1.0 part lemon essential oil, 0.075 parts borneol oil and 0.5 parts vitamin E, first stir the lavender essential oil and rosemary essential oil at 500 rpm for 5 minutes, then add lemon essential oil and stir at 800 rpm for 3 minutes, then add vitamin E and borneol oil and stir at 400 rpm for 2 minutes, then add 0.3 parts disodium EDTA to the essential oil mixture and stir at 400 rpm for 5 minutes, then add 0.66 parts chitosan-lecithin complex powder and shake at 150 rpm for 90 minutes; finally add 0.5 parts magnesium aluminum silicate and stir at 600 rpm for 8 minutes to obtain the blended essential oil. Semi-finished product preparation: Add compound essential oil to a homogenized emulsion with the temperature reduced to below 35℃, and slowly add 10% citric acid solution at 2mL / s to adjust the pH to 4.7. Stir at 400rpm for 8min to ensure that the active ingredients are evenly dispersed in the emulsion system to obtain the semi-finished product. Finished product preparation: The semi-finished product is subjected to negative pressure of -0.08MPa for 5 minutes to remove air bubbles from the emulsion; during the filling process, high-purity nitrogen is introduced to control the oxygen content to be below 0.5% to obtain the finished product.

[0023] Example 3

[0024] A natural plant essential oil hair conditioner and its preparation method, comprising the following steps: Oil phase preparation: 23 parts shea butter, 15 parts coconut oil, 12 parts cetearyl alcohol polyether-20 and 4 parts sorbitan olive oil ester were mixed and melted in a constant temperature water bath at 38°C and stirred at a stirring rate of 800 rpm for 10 min to ensure that each component was fully dissolved and formed a homogeneous oil phase system. Aqueous phase preparation: 45 parts of deionized water were heated to 43°C, and 0.6 parts of xanthan gum were added and stirred to dissolve, forming a stable aqueous phase system; Emulsification: The oil phase system was slowly added to the aqueous phase system at a flow rate of 5 mL / s. After initial mixing at 800 rpm, the mixture was homogenized at 2200 rpm for 12 min using a high-shear homogenizer. During homogenization, a water-cooling device was used to control the emulsification process temperature at 46℃. The D particle size was measured using a laser particle size analyzer. 50 =1.2μm, to ensure the dispersion of emulsion particles, and gradually cool from 43-47℃ to 36℃ at a rate of 0.5℃ / min to obtain emulsion; Essential oil blend: According to the formula of 2.3 parts lavender essential oil, 1.5 parts rosemary essential oil, 1.0 part lemon essential oil, 0.05 parts borneol oil and 0.5 parts vitamin E, first stir the lavender essential oil and rosemary essential oil at 500 rpm for 5 minutes, then add lemon essential oil and stir at 800 rpm for 3 minutes, then add vitamin E and borneol oil and stir at 400 rpm for 2 minutes, then add 0.3 parts disodium EDTA to the essential oil mixture and stir at 400 rpm for 5 minutes, then add 0.55 parts chitosan-lecithin complex powder and shake at 150 rpm for 90 minutes; finally add 0.5 parts magnesium aluminum silicate and stir at 600 rpm for 8 minutes to obtain the blended essential oil; Semi-finished product preparation: Add compound essential oil to a homogenized emulsion with the temperature reduced to below 35℃, and slowly add 10% citric acid solution at 2mL / s to adjust the pH to 4.5. Stir at 400rpm for 8min to ensure that the active ingredients are evenly dispersed in the emulsion system to obtain the semi-finished product. Finished product preparation: The semi-finished product is treated with a negative pressure of -0.08MPa for 5 minutes to remove air bubbles from the emulsion; during the filling process, high-purity nitrogen is introduced to control the oxygen content to be below 0.5% to prevent the essential oil from oxidizing during storage, thus obtaining the finished product.

[0025] Example 4

[0026] A natural plant essential oil hair conditioner and its preparation method, comprising the following steps: Oil phase preparation: 27 parts shea butter, 15 parts coconut oil, 12 parts cetearyl alcohol polyether-20 and 4 parts sorbitan olive oil ester were mixed and melted in a constant temperature water bath at 47°C and stirred at a stirring rate of 800 rpm for 10 min to ensure that each component was fully dissolved and formed a homogeneous oil phase system. Aqueous phase preparation: 45 parts of deionized water were heated to 43°C, and 0.6 parts of xanthan gum were added and stirred to dissolve, forming a stable aqueous phase system; Emulsification: The oil phase system was slowly added to the aqueous phase system at a flow rate of 5 mL / s. After initial mixing at 800 rpm, the mixture was homogenized at 2200 rpm for 12 min using a high-shear homogenizer. During homogenization, a water-cooling device was used to control the emulsification process temperature at 44℃. The D particle size was measured using a laser particle size analyzer. 50 =1.2μm, to ensure the dispersion of emulsion particles, and gradually cool from 43-47℃ to 34℃ at a rate of 0.5℃ / min to obtain emulsion; Essential oil blend: Following the formula of 2.7 parts lavender essential oil, 1.5 parts rosemary essential oil, 1.0 part lemon essential oil, 0.1 part borneol oil, and 0.5 parts vitamin E, first stir the lavender and rosemary essential oils at 500 rpm for 5 minutes, then add the lemon essential oil and stir at 800 rpm for 3 minutes, then add the vitamin E and borneol oil and stir at 400 rpm for 2 minutes, then add 0.3 parts disodium EDTA to the essential oil mixture and stir at 400 rpm for 5 minutes, then add 0.825 parts chitosan-lecithin complex powder and shake at 150 rpm for 90 minutes; finally, add 0.5 parts magnesium aluminum silicate and stir at 600 rpm for 8 minutes to obtain the blended essential oil. Semi-finished product preparation: Add compound essential oil to a homogenized emulsion with the temperature reduced to below 35℃, and slowly add 10% citric acid solution at 2mL / s to adjust the pH to 5.0. Stir at 400rpm for 8min to ensure that the active ingredients are evenly dispersed in the emulsion system to obtain the semi-finished product. Finished product preparation: The semi-finished product is subjected to negative pressure of -0.08MPa for 5 minutes to remove air bubbles from the emulsion; during the filling process, high-purity nitrogen is introduced to control the oxygen content to be below 0.5% to obtain the finished product.

[0027] Comparative Example 1 The difference from Example 1 is that, in the process of essential oil blending, chitosan-lecithin complex powder and disodium EDTA are not added, and untreated essential oils are added directly.

[0028] Comparative Example 2 The difference from Example 1 is that the emulsification process has large temperature fluctuations, ranging from 50°C to 55°C.

[0029] Comparative Example 3 The difference from Example 1 is that the oxygen content during the canning process is 1.0%.

[0030] Comparative Example 4 The difference from Example 1 is that the oil phase preparation temperature is 52°C and the emulsification and homogenization time is 8 min.

[0031] Comparative Example 5 The difference from Example 1 is that the essential oil combination ratio is 3 parts lavender essential oil, 1 part rosemary essential oil, 0.5 parts lemon essential oil and 0.5 parts vitamin E.

[0032] Comparative Example 6 The difference from Example 1 is that disodium EDTA is not added.

[0033] Comparative Example 7 The difference from Example 1 is that magnesium aluminum silicate is not added.

[0034] Comparative Example 8 The difference from Example 1 is that the chitosan-lecithin composite powder was added first, followed by disodium EDTA, and then magnesium aluminum silicate.

[0035] Comparative Example 9 The difference from Example 1 is that the emulsification process temperature is 50°C.

[0036] The test items include: Particle size stability: Refer to QB / T1975-2013, evaluation index: centrifugal stratification rate.

[0037] Active components of essential oils: Quantitative analysis was performed using HPLC (high performance liquid chromatography) in accordance with GB / T34819-2017. Evaluation index: retention rate of active components.

[0038] Tensile strength improvement rate: Undamaged human hair strands were selected and divided into a blank group (untreated) and an experimental group (treated with conditioner). Conditioner was applied evenly to 0.2 g / g of hair strands, left to stand for 5 minutes, rinsed, and blow-dried at 40℃ to constant weight. Using a fiber strength tester equipped with a pneumatic clamp (anti-slip) and a 10N force sensor, with a clamping distance of 20 mm, a tensile rate of 20 mm / min, and an environment of 25℃±1℃ and relative humidity of 65%±5%, the tensile strength of both groups was measured. The tensile strength improvement rate (%) was calculated as follows: (Average tensile strength of experimental group – Average tensile strength of blank group) ÷ Average tensile strength of blank group × 100.

[0039] Cuticle closure rate: The cuticle upturn angle (θ) and exposed area between cuticles are measured using image processing software (ImageJ). θ ≤ 5° and cuticle gap ≤ 5% are considered closed. Cuticle closure rate (%) = (1 – total number of cuticles ÷ number of upturned cuticles) × 100 The test results are shown in Table 1.

[0040] Table 1. Test results of the examples and comparative examples. experimental group Centrifugation stratification rate (%) Linaloyl acetate retention rate (%) d-Limonene retention (%) Example 1 0.8 93.7 91.5 Example 2 1.2 91.0 89.8 Example 3 1.6 89.5 87.2 Comparative Example 1 15.3 67.3 58.2 Comparative Example 2 7.2 82.1 76.4 Comparative Example 3 1.5 72.6 51.3 Comparative Example 4 8.9 78.3 70.5 Comparative Example 5 4.3 85.2 74.1 Comparative Example 6 5.1 80.5 68.3 Comparative Example 7 3.8 84.7 73.2 Comparative Example 8 12.7 82.4 69.8 experimental group Fracture strength improvement rate (%) Hair cuticle closure rate (%) Peroxides (ppm) Example 1 +45.2 94.5 42 Example 2 +43.5 93.2 48 Example 3 +42.1 93.7 52 Comparative Example 1 +22.1 71.2 210 Comparative Example 2 +30.3 83.5 125 Comparative Example 3 +25.8 76.4 385 Comparative Example 4 +28.7 80.1 168 Comparative Example 5 +29.6 81.9 102 Comparative Example 6 +27.9 79.6 155 Comparative Example 7 +31.5 85.3 112 Comparative Example 8 +26.3 73.5 138 The examples provide better data compared to the comparative examples. The performance degradation of each comparative example compared to Example 1 is mainly due to the absence of key processes or components: Comparative Example 1, due to the omission of chitosan-lecithin complex powder and disodium EDTA, resulted in the essential oil being exposed to an oxidative environment, causing a surge in peroxide value, while the retention rates of linalyl acetate and d-limonene decreased, and the cuticle closure rate significantly deteriorated; Comparative Example 2, due to exceeding the emulsification temperature limit, caused the decomposition of heat-sensitive components and the destruction of the emulsion structure, resulting in an increased centrifugal stratification rate and a decreased retention rate of active ingredients; Comparative Example 3, due to excessive oxygen content during filling, intensified the oxidation chain reaction of the essential oil, causing a sharp decrease in the retention rate of d-limonene and an increase in the peroxide value; Comparative Example 4, due to high oil phase temperature leading to lipid crystallization and insufficient homogenization time, resulted in uneven particle size dispersion, a stratification rate of 8.9%, and a 16.5% decrease in the rate of improvement in tensile strength; Comparative Example 5, due to the absence of chitosan-lecithin complex powder and disodium EDTA, resulted in the loss of essential oil closure rate and the loss of the retention rate of active ingredients; Comparative Example 5, due to the absence of chitosan-lecithin complex powder and disodium EDTA, caused the essential oil closure rate to decrease, while the retention rate of d-limonene decreased, and the retention rate of active ingredients decreased; Comparative Example 5, due to excessive oxygen content during filling, intensified the oxidation chain reaction of essential oil, resulting in a sharp decrease in the retention rate of d-limonene and an increase in the peroxide value; Comparative Example 4, due to high oil phase temperature leading to lipid crystallization and insufficient homogenization time, resulted in uneven particle size dispersion, a stratification rate of 8.9%, and a 16.5% decrease in the An imbalance in the oil ratio weakens the synergistic antioxidant effect and exacerbates acidic hydrolysis, ultimately leading to a 17.4% decrease in d-limonene retention and a reduction in hair-conditioning efficacy. Comparative Example 6, due to the loss of metal ion chelating ability, leads to catalytic oxidation of metal ions, generating free radicals, resulting in an increased oxidation rate of essential oils and an increase in peroxides. Comparative Example 7, due to the inability to adsorb and remove free oxidation products, continuously attacks the active ingredients, leading to a decrease in the retention rate of active substances. Test data from Comparative Example 8 shows that the order of addition of auxiliary additives significantly affects the stability and efficacy of the conditioner. The correct order (disodium EDTA → chitosan-lecithin → magnesium aluminum silicate) can synergistically remove metal ions and form a stable protective layer, while the incorrect order in Comparative Example 8 leads to metal ion residue and a decrease in antioxidant capacity, thus resulting in a decline in conditioner function. In summary, Example 1, through innovative processes such as low-temperature emulsification, composite antioxidant encapsulation, precise formulation, and inert filling, systematically solves the problems of active ingredient protection and system stability.

[0041] In summary, this invention has successfully developed a natural plant essential oil hair conditioner with high retention rate of active ingredients by optimizing the raw material ratio and low-temperature emulsification process, as well as a process for achieving stable dispersion of essential oils in an oil system under low-temperature conditions.

Claims

1. A natural plant essential oil hair conditioner, characterized in that, Including a mixture of oil phase system, aqueous phase system, active ingredient addition system and auxiliary additives, by weight, The oil phase system comprises: a vegetable oil matrix and a composite emulsifier; The plant oil matrix comprises: 13-17 parts coconut oil and 23-27 parts shea butter; The composite emulsifier comprises: 11-13 parts cetearyl alcohol polyether-20 and 3.7-4.3 parts sorbitan olive oil ester; The aqueous phase system comprises: 38-52 parts deionized water and 0.55-0.65 parts xanthan gum; The active ingredient addition system includes: 2.3-2.7 parts lavender essential oil, 1.4-1.6 parts rosemary essential oil, 0.9-1.1 parts lemon essential oil, 0.05-0.1 parts borneol oil, and 0.4-0.6 parts vitamin E; The auxiliary additives include: 0.55-0.825 parts chitosan-lecithin composite powder, 0.28-0.32 parts disodium EDTA and 0.48-0.52 parts magnesium aluminum silicate.

2. A method for preparing a natural plant essential oil hair conditioner as described in claim 1, characterized in that, Includes the following steps: Oil phase preparation: Mix vegetable oil matrix and composite emulsifier according to the formula, and homogenize to obtain oil phase system; Aqueous phase preparation: Xanthan gum was dissolved in water according to the specified ratio to obtain an aqueous phase system; Emulsification: The oil phase system is slowly added to the aqueous phase system, homogenized and emulsified at 43-47℃, and then slowly cooled to 34-36℃ to obtain an emulsion; Essential oil blending: Mix according to the formula of the active ingredient addition system, and then add auxiliary additives. The order of adding auxiliary additive components is as follows: first add disodium EDTA, then add chitosan-lecithin complex powder, and finally add magnesium aluminum silicate to obtain blended essential oils. Semi-finished product preparation: Mix the homogenized emulsion and compound essential oil, adjust the pH to 4.5-5.0, and disperse evenly to obtain the semi-finished product; Finished product preparation: The semi-finished product is treated with negative pressure and then filled to obtain the finished product.

3. The method for preparing the natural plant essential oil hair conditioner as described in claim 2, characterized in that, In the oil phase preparation process, the homogenization process is as follows: the vegetable oil matrix and the composite emulsifier are mixed and melted in a constant temperature water bath environment of 38-47℃, and stirred at a stirring rate of 700-900rpm for 8-12min.

4. The method for preparing the natural plant essential oil hair conditioner as described in claim 2, characterized in that, During the aqueous phase preparation process, xanthan gum is dissolved in water at 38-47℃ according to the specified ratio.

5. The method for preparing the natural plant essential oil hair conditioner as described in claim 2, characterized in that, During the emulsification process, the homogenization emulsification process is as follows: after initial mixing at 800 rpm under 43-47℃ conditions, homogenize for 10-14 min at 2200-2800 rpm using a high-shear homogenizer.

6. The method for preparing the natural plant essential oil hair conditioner as described in claim 2, characterized in that, The temperature was gradually reduced from 43-47℃ to 34-36℃ at a rate of 0.4-0.6℃ / min.

7. The method for preparing the natural plant essential oil hair conditioner as described in claim 2, characterized in that, According to the formula of the active ingredient addition system, first stir lavender essential oil and rosemary essential oil at 450-550 rpm for 4-6 minutes, then add lemon essential oil and stir at 700-900 rpm for 2-4 minutes, then add vitamin E and borneol oil and stir at 350-450 rpm for 2-3 minutes, then add disodium EDTA and stir at 350-450 rpm for 4-6 minutes, then add chitosan-lecithin complex powder and shake at 120-180 rpm for 80-100 minutes, and finally add magnesium aluminum silicate and stir at 550-650 rpm for 7-9 minutes.

8. The method for preparing the natural plant essential oil hair conditioner as described in claim 2, characterized in that, During the preparation of the semi-finished product, the pH is adjusted using citric acid.

9. The method for preparing the natural plant essential oil hair conditioner as described in claim 2, characterized in that, The negative pressure treatment process is as follows: negative pressure treatment of -0.07~-0.09MPa for 5 minutes.

10. The method for preparing the natural plant essential oil hair conditioner as described in claim 2, characterized in that, The filling process requires the introduction of high-purity nitrogen gas to control the oxygen content to below 0.5%.