Light touch melting wax as well as preparation method and application thereof

Abstract

The invention relates to the technical field of waxy materials, and particularly discloses light touch melting wax as well as a preparation method and application thereof, the light touch melting wax comprises the following components: 30-50 parts of ozokerite, 10-50 parts of microcrystalline wax, 3-7 parts of light microspheres, 6-12 parts of vegetable fat wax and 1-3 parts of a regulator; the touch melting wax prepared by the preparation method disclosed by the invention is light in texture, has temperature-responsive touch melting characteristic and oil locking capability, improves the wrapping and fixing capability of the wax on oily components by optimizing the crystal structure of the wax and introducing oil locking auxiliary components, is high in stability, can still keep stable oil locking performance in the storage process, and avoids oil migration and layering; the air permeability is improved by a network structure formed by dispersing introduced light microspheres, the melting temperature is close to the temperature of human skin, the melting time is less than 10s by adding the light microspheres and the regulator and optimizing the composition proportion of the microcrystalline wax and other raw materials, the product is quickly softened but does not flow when being touched, and a formed film layer is compact and has strong oil locking capacity.

Description

Technical Field

[0001] This invention relates to the field of wax materials technology, specifically to a lightweight tactile wax, its preparation method, and its applications. Background Technology

[0002] There are many types of waxes available, possessing the characteristics of "solid-state shaping and heat-molding," with applications spanning cosmetics, personal care, pharmaceutical sustained-release, and industrial protection. The current market offers a diversified range of waxes, encompassing natural waxes (such as beeswax, hydrogenated jojoba wax, and carnauba wax), petroleum waxes (such as ceresin wax, microcrystalline wax, and paraffin wax), and synthetic waxes (such as polyethylene glycol wax and polyethylene wax). The core differences in the performance of existing waxes stem from three key characteristics: molecular chain structure (straight-chain / branched / cyclic), crystallinity (high / medium / low), and melting point range (high / medium / low). These characteristics directly determine the wax's performance. High-crystallinity waxes have high melting points and good oil-locking ability, but poor application properties and a heavy feel on the skin. Conversely, waxes with relatively short molecular chains or loose crystal structures have lower melting points, poor oil-locking ability, and a poor skin feel. Therefore, oil-locking ability and skin feel are the main problems currently facing waxes. The technical focus of this research is to develop a wax that combines touch-melting, lightweight texture, and oil-locking properties, overcoming the performance limitations of existing waxes. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a lightweight touch-melt wax and its preparation method and application, so as to solve the problem that the wax in the prior art has a single property and cannot have both lightweight and oil-locking properties.

[0004] The present invention solves the above-mentioned technical problems. The present invention provides a lightweight touch-melt wax, comprising the following components by weight: 30-50 parts of ceresin wax, 10-50 parts of microcrystalline wax, 3-7 parts of lightweight microspheres, 6-12 parts of plant lipid wax, and 1-3 parts of regulator. The lightweight microspheres are obtained by treating solid nano-silica with alkaline solution and then mixing it with animal fat. The solid nano-silica has a particle size of 50-100 nm; The lightweight microspheres are prepared by mixing solid nano-silica at a solid-liquid ratio of 1:5-8 g / mL with a NaOH solution of 0.1-0.3 mol / L, stirring at 30-35℃ for 30-40 min, adjusting the pH to neutralize, washing with deionized water by centrifugation, vacuum drying, adding 20-30% of the mass of solid nano-silica to molten animal fat at a melting temperature of 60-70℃, and then shearing and mixing at 1000-1200 rpm at 45-50℃ for 5-10 min. The animal fat is beeswax and lanolin in a mass ratio of 1:1-3; after alkaline treatment, nano-diameter pits are formed on the surface of nano-silica, which has good dispersibility and can be hydrogen bonded with animal fat to improve compatibility. The nano-level support improves the smoothness of the wax, and its transparent structure does not affect the appearance of the tactile wax. The plant-based lipid wax is obtained by mixing and homogenizing hydrogenated jojoba wax, acetylated rice bran wax and caprylic / capric triglycerides and then subjecting them to electrostatic treatment. The plant-based wax is obtained by mixing hydrogenated jojoba wax, acetylated rice bran wax, and caprylic / capric triglycerides in a mass ratio of 6-10:3-5:2-4, homogenizing and emulsifying at 65-75℃ for 20-30 minutes, and then electrostatically treating. By combining the three waxes with gradient polarity, the microcrystalline structure of the hydrogenated jojoba wax is optimized to form a continuous oil-locking network. The hydroxyl groups (-OH) of the acetylated rice bran wax and the ester groups (-COO-) of the hydrogenated jojoba wax form hydrogen bonds for anchoring, and the caprylic / capric triglycerides fill the gaps in the network, significantly improving the adsorption capacity of the tactile wax for polar oils and enhancing the oil-locking performance of the tactile wax.

[0005] The electrostatic treatment involves processing under an electrostatic field of 20-30 kV for 8-12 seconds; this can refine the microcrystalline particle size of hydrogenated jojoba wax, improve the skin feel, and increase polarity through the interface, induce the directional arrangement of polar groups on the molecular surface, and form weak hydrogen bonds with polar oils to enhance oil-locking performance. The viscosity of the microcrystalline wax is 30-40 mPa·s, and the low softening point of the ceresin is 58-65℃. The regulator is PEG-40 hydrogenated castor oil containing 1-3 wt% triacetin; it has a dispersing effect. The PEG segments of PEG-40 hydrogenated castor oil can form hydrogen bonds with the hydroxyl groups (-OH) on the surface of light microspheres. The hydrogenated castor oil segments can be miscible with the fatty acid chains of plant waxes, improving the compatibility of raw materials. Triacetin can insert into the interlattice of wax molecular chains, weakening intermolecular forces, inhibiting the excessive crystallization of ceresin and microcrystalline wax, and reducing the viscosity of the system.

[0006] This invention also provides a method for preparing a lightweight thawable wax, comprising the following steps: (1) Pretreatment: Crush the wax and microcrystalline wax separately through an 80-mesh sieve and vacuum dry to remove trace amounts of moisture; (2) Melting and mixing: Under nitrogen protection, add ceresin wax and microcrystalline wax to a double-layer reactor, stir and melt at 65-70℃ and 100-200r / min, then add vegetable fat wax and continue stirring for 10-20min; (3) Stirring and mixing: Cool down to 50-55℃, add regulator, stir at 200-300r / min for 20-30min to form a uniform base material; (4) Lightweight treatment: Slowly add lightweight microspheres to the base material and disperse them ultrasonically, then stir at a low speed of 90-100 r / min for 6-10 min; (5) Molding: The mixture is poured into a mold, allowed to cool naturally, then refrigerated to set, and then demolded to obtain the final product; The ultrasonic dispersion power is 200-300W, and the time is 8-12min.

[0007] The present invention also provides an application of a lightweight touch-melt wax in the field of cosmetics and skin care products.

[0008] The beneficial effects of this invention are as follows: The touch-melt wax prepared by this invention has a light texture, temperature-responsive touch-melt properties, and oil-locking ability. By optimizing the crystal structure of the wax, a loose-dense hierarchical crystal network is constructed. Plant waxes and lightweight microspheres can enhance the wax's ability to encapsulate and fix oily components, resulting in high stability. It can maintain stable oil-locking performance during storage, avoiding oil migration and stratification. The introduced lightweight microspheres, along with plant waxes and microcrystalline waxes, enhance the spreadability after touch-melt, resulting in low application resistance. At the same time, they form nanoscale micro-gap in the wax matrix and provide structural support when the oil content of the touch-melt wax is high, enhancing the oil-locking ability. The addition of lightweight microspheres and regulators, as well as the optimization of the composition ratio of raw materials such as microcrystalline wax, make the touch-melt temperature close to the temperature of human skin, with a touch-melt time of <10s. It softens quickly upon contact but does not flow, forming a dense film with strong oil-locking ability. Detailed Implementation

[0009] The present invention will be further described in detail below through specific implementation examples. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope of the appended claims.

[0010] Unless otherwise specified, all raw materials and reagents used in this invention are from the conventional market.

[0011] Example 1 A method for preparing a lightweight thawable wax includes the following steps: (1) Pretreatment: 40 parts of terrestrial wax with a low softening point of 65℃ and 30 parts of microcrystalline wax with a viscosity of 40mPa・s were pulverized and passed through an 80-mesh sieve, and vacuum dried to remove trace amounts of moisture. (2) Melting and mixing: Under nitrogen protection, add ceresin and microcrystalline wax to a double-layer reactor, stir and melt at 68°C and 150 r / min, then add 9 parts of vegetable fat wax and continue stirring for 15 min; The plant-based wax is obtained by mixing hydrogenated jojoba wax, acetylated rice bran wax, and caprylic / capric triglycerides in a mass ratio of 8:4:3, homogenizing and emulsifying at 70°C for 25 min, and then electrostatically treating it under a 25 kV electrostatic field for 10 s. (3) Stirring and mixing: Cool down to 50°C, add 2 parts of PEG-40 hydrogenated castor oil containing 2wt% triacetin, stir at 250r / min for 25min to form a uniform base; (4) Lightweight treatment: Slowly add 5 parts of lightweight microspheres to the base material and ultrasonically disperse them for 10 min at a power of 250W, then stir at a low speed of 95r / min for 8 min; The lightweight microspheres are prepared by mixing solid nano-silica at a solid-liquid ratio of 1:7 g / mL with a 0.2 mol / L NaOH solution, stirring at 30°C for 35 min, adjusting the pH to neutralize, washing with deionized water by centrifugation, vacuum drying, adding 25% (by weight of the solid nano-silica) of molten animal fat at a melting temperature of 65°C, and then shearing and mixing at 48°C and 1100 rpm for 8 min; the animal fat is beeswax and lanolin in a mass ratio of 1:2. (5) Molding: The mixture is injected into the mold, cooled naturally, and then refrigerated to set. It is then demolded to obtain the final product.

[0012] Example 2 A method for preparing a lightweight thawable wax includes the following steps: (1) Pretreatment: 30 parts of terrestrial wax with a low softening point of 65℃ and 10 parts of microcrystalline wax with a viscosity of 40mPa・s were pulverized and passed through an 80-mesh sieve, and vacuum dried to remove trace amounts of moisture. (2) Melting and mixing: Under nitrogen protection, add ceresin and microcrystalline wax to a double-layer reactor, stir and melt at 65°C and 100 r / min, then add 6 parts of vegetable fat wax and continue stirring for 10 min; The plant-based lipid wax is obtained by mixing hydrogenated jojoba wax, acetylated rice bran wax, and caprylic / capric triglycerides in a mass ratio of 6:3:2, homogenizing and emulsifying at 70°C for 20 min, and then electrostatically treating it under a 20 kV electrostatic field for 8 s. (3) Stirring and mixing: Cool down to 50°C, add 1 part of PEG-40 hydrogenated castor oil containing 1 wt% triacetin, stir at 200 r / min for 20 min to form a uniform base; (4) Lightweight treatment: Slowly add 3 parts of lightweight microspheres to the base material and ultrasonically disperse them for 8 minutes at a power of 200W, then stir at a low speed of 90r / min for 6 minutes; The lightweight microspheres are prepared by mixing solid nano-silica at a solid-liquid ratio of 1:5 g / mL with a 0.1 mol / L NaOH solution, stirring at 30°C for 30 min, adjusting the pH to neutralize, washing with deionized water by centrifugation, vacuum drying, adding 20% ​​(by weight) of molten animal fat at a melting temperature of 60°C, and then shearing and mixing at 45°C and 1000 rpm for 5 min; the animal fat is a mixture of beeswax and lanolin in a 1:1 mass ratio. (5) Molding: The mixture is injected into the mold, cooled naturally, and then refrigerated to set. The mixture is then demolded.

[0013] Example 3 A method for preparing a lightweight thawable wax includes the following steps: (1) Pretreatment: 50 parts of terrestrial wax with a low softening point of 65℃ and 50 parts of microcrystalline wax with a viscosity of 40mPa・s were pulverized and passed through an 80-mesh sieve, and vacuum dried to remove trace amounts of moisture. (2) Melting and mixing: Under nitrogen protection, add ceresin and microcrystalline wax to a double-layer reactor, stir and melt at 70°C and 200 r / min, then add 12 parts of vegetable fat wax and continue stirring for 20 min; The plant-based lipid wax is obtained by mixing hydrogenated jojoba wax, acetylated rice bran wax, and caprylic / capric triglycerides in a mass ratio of 10:5:4, homogenizing and emulsifying at 75°C for 30 min, and then electrostatically treating it under a 30 kV electrostatic field for 12 s. (3) Stirring and mixing: Cool down to 55°C, add 3 parts of PEG-40 hydrogenated castor oil containing 3wt% triacetin, stir at 300r / min for 30min to form a uniform base material; (4) Lightweight treatment: Slowly add 7 parts of lightweight microspheres to the base material and ultrasonically disperse them for 12 minutes at a power of 300W, then stir at a low speed of 100r / min for 10 minutes; The lightweight microspheres are prepared by mixing solid nano-silica at a solid-liquid ratio of 1:8 g / mL with a 0.3 mol / L NaOH solution, stirring at 35°C for 40 min, adjusting the pH to neutralize, washing with deionized water by centrifugation, vacuum drying, adding 30% (by weight) of molten animal fat at a melting temperature of 70°C, and then shearing and mixing at 50°C and 1200 rpm for 10 min; the animal fat is beeswax and lanolin in a mass ratio of 1:3. (5) Molding: The mixture is injected into the mold, cooled naturally, and then refrigerated to set. The mixture is then demolded.

[0014] Example 4 A method for preparing a lightweight thawable wax includes the following steps: (1) Pretreatment: 45 parts of terrestrial wax with a low softening point of 65℃ and 20 parts of microcrystalline wax with a viscosity of 40mPa・s were pulverized and passed through an 80-mesh sieve, and vacuum dried to remove trace amounts of moisture. (2) Melting and mixing: Under nitrogen protection, add ceresin and microcrystalline wax to a double-layer reactor, stir and melt at 70°C and 100 r / min, then add 7 parts of vegetable fat wax and continue stirring for 15 min; The plant-based lipid wax is obtained by mixing hydrogenated jojoba wax, acetylated rice bran wax, and caprylic / capric triglycerides in a mass ratio of 7:4:2, homogenizing and emulsifying at 70°C for 30 min, and then electrostatically treating it under a 20 kV electrostatic field for 12 s. (3) Stirring and mixing: Cool down to 50°C, add 3 parts of PEG-40 hydrogenated castor oil containing 2wt% triacetin, stir at 200r / min for 30min to form a uniform base material; (4) Lightweight treatment: Slowly add 7 parts of lightweight microspheres to the base material and ultrasonically disperse them for 12 minutes at a power of 200W, then stir at a low speed of 90r / min for 10 minutes; The lightweight microspheres are prepared by mixing solid nano-silica at a solid-liquid ratio of 1:6 g / mL with a 0.3 mol / L NaOH solution, stirring at 30°C for 40 min, adjusting the pH to neutralize, washing with deionized water by centrifugation, vacuum drying, adding molten animal fat at 22% of the mass of the solid nano-silica, melting at 70°C, and then shearing and mixing at 1200 rpm for 5 min at 45°C. The animal fat is a mixture of beeswax and lanolin in a mass ratio of 1:3. (6) Molding: The mixture is injected into the mold, cooled naturally, and then refrigerated to set. It is then demolded to obtain the final product.

[0015] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 uses solid nano-silica instead of lightweight microspheres, while everything else remains the same.

[0016] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 does not contain acetylated rice bran wax, while other aspects remain the same.

[0017] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the plant wax in Comparative Example 3 is not subjected to electrostatic treatment, while everything else remains the same.

[0018] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that no regulator was added to Comparative Example 4, while everything else remained the same.

[0019] 1. (1) Place the fusion wax samples of the examples and comparative examples in a constant temperature environment of (25±1)℃ for equilibration for 24h, and detect the density of the fusion wax in solid state at 25℃. Set the temperature of the constant temperature heating stage to (35±0.5)℃ (simulating the average temperature of facial skin). After the temperature stabilizes, place 1g of fusion wax sample in the center of the heating stage and record the time from when the sample contacts the heating stage until it completely melts and forms a homogeneous fluid. This is the fusion time. At the same time, use a viscometer (NDJ-8S type) to detect the viscosity of the melted fluid (at 35℃). (2) Coating resistance = constant force applied during coating (g, unit of gravity or converted to gravity value) / contact length between coating tool and substrate (cm); Take the tactile wax samples from the examples and comparative examples, heat and melt them, and then evenly apply them to the surface of the artificial skin simulation membrane (area ≥10cm×5cm). Control the sample thickness (e.g., 0.5mm, calibrated with a thickness gauge), cool to 37℃, and test the application resistance using a universal testing machine. The test results are shown in Table 1.

[0020] Table 1. Catalytic properties of catalytic waxes As shown in Table 1, the tactile wax prepared in the embodiments of the present invention is a high-quality tactile wax with a melting time of <10s, a melting viscosity of <500 mPa·s, a density of <9.8 g / cm³, a coating resistance of <60g / cm, a light texture, melts upon contact with the skin, and is smooth to apply without clumping. As shown in the comparative example, the added lightweight microspheres, plant waxes and regulators can improve the skin feel and tactile properties of the tactile wax.

[0021] II. Test method for the oil-locking ability of tactile wax: Mix tactile wax and jojoba oil at a mass ratio of 7:3 to prepare a sample simulating the actual formula. Apply the sample evenly to a polytetrafluoroethylene (PTFE) film (area 5cm×5cm) and place it in a constant temperature and humidity chamber at 37℃ and 40% relative humidity. Weigh the sample at 0h, 4h and 8h respectively. Calculate the oil residue rate by the ratio of the weight at the time of test to the initial weight. The results are shown in Table 2.

[0022] Table 2 Oil Residue Rate As shown in Table 2, the residual oil rate of the tactile wax prepared by the present invention is >80% after 8 hours, indicating good oil-locking performance and good storage stability.

[0023] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lightweight, thawable wax, characterized in that, It includes the following components by weight: 30-50 parts of ceresin wax, 10-50 parts of microcrystalline wax, 3-7 parts of lightweight microspheres, 6-12 parts of plant lipid wax, and 1-3 parts of regulator; The lightweight microspheres are obtained by treating solid nano-silica with alkaline solution and then mixing it with animal fat. The plant-based lipid wax is obtained by mixing and homogenizing hydrogenated jojoba wax, acetylated rice bran wax, and caprylic / capric triglycerides and then subjecting them to electrostatic treatment.

2. The lightweight thawable wax according to claim 1, characterized in that, The lightweight microspheres are prepared by mixing solid nano-silica at a solid-liquid ratio of 1:5-8 g / mL with a NaOH solution of 0.1-0.3 mol / L, stirring at 30-35℃ for 30-40 min, adjusting the pH to neutralize, washing with deionized water by centrifugation, vacuum drying, adding 20-30% (by weight of the solid nano-silica) of molten animal fat at a melting temperature of 60-70℃, and then shearing and mixing at 1000-1200 rpm for 5-10 min at 45-50℃.

3. The lightweight touch-melting wax according to claim 1, characterized in that, The animal fat is beeswax and lanolin in a mass ratio of 1:1-3.

4. The lightweight thawable wax according to claim 1, characterized in that, The viscosity of the microcrystalline wax is 30-40 mPa·s, and the low softening point of the terrestrial wax is 58-65℃.

5. The lightweight thawable wax according to claim 1, characterized in that, The regulator is PEG-40 hydrogenated castor oil containing 1-3 wt% triacetin.

6. The lightweight thawable wax according to claim 1, characterized in that, The plant-based wax is obtained by mixing hydrogenated jojoba wax, acetylated rice bran wax, and caprylic / capric triglycerides in a mass ratio of 6-10:3-5:2-4, homogenizing and emulsifying at 65-75℃ for 20-30 minutes, and then electrostatically treating it.

7. The lightweight thawable wax according to claim 1, characterized in that, The electrostatic treatment is performed under an electrostatic field of 20-30 kV for 8-12 seconds.

8. A method for preparing a lightweight thawable wax, used to prepare the lightweight thawable wax according to any one of claims 1-7, characterized in that, Includes the following steps: (1) Pretreatment: Crush the wax and microcrystalline wax separately through an 80-mesh sieve and vacuum dry to remove trace amounts of moisture; (2) Melting and mixing: Under nitrogen protection, add ceresin wax and microcrystalline wax to a double-layer reactor, stir and melt at 65-70℃ and 100-200r / min, then add vegetable fat wax and continue stirring for 10-20min; (3) Stirring and mixing: Cool down to 50-55℃, add regulator, stir at 200-300r / min for 20-30min to form a uniform base material; (4) Lightweight treatment: Slowly add lightweight microspheres to the base material and disperse them ultrasonically, then stir at a low speed of 90-100 r / min for 6-10 min; (5) Molding: The mixture is injected into the mold, cooled naturally, and then refrigerated to set. The mixture is then demolded.

9. The method for preparing a lightweight thawable wax according to claim 8, characterized in that, The ultrasonic dispersion power is 200-300W, and the time is 8-12min.

10. The application of a lightweight, thawable wax, characterized in that, The application of a lightweight touch-melt wax according to any one of claims 1-7 in the field of cosmetics and skin care products.

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