Thermopressure dual-trigger microcapsule, preparation method thereof and lipstick

Abstract

This application discloses a thermo-pressure dual-trigger microcapsule and its preparation method, as well as a lipstick. The thermo-pressure dual-trigger microcapsule includes: a core material, which comprises a first core material component, a second core material component, and a third core material component; and a shell layer, which covers the outer periphery of the core material and comprises a first shell layer component and a second shell layer component; the first core material component is at least one of squalane, hydrogenated polyisobutylene, caprylic / capric triglyceride, isononyl isononanoate, jojoba oil, squalene, and meadowfoam seed oil; the second core material component is at least one of vitamin E acetate, tocopherol, vitamin E linoleate, rosemary extract, and ascorbyl palmitate; the third core material component is at least one of phytosterols, cholesterol, phytosphoin, ceramide, and bisabolol; the first shell layer component is a polymethyl methacrylate cross-linked polymer; and the softening point of the second shell layer component is 30℃-50℃.

Description

Technical Field

[0001] This application relates to the field of daily chemical products technology, and in particular to a temperature and pressure dual-trigger microcapsule and its preparation method, and a lipstick. Background Technology

[0002] Lipstick is a major consumer product in daily care and beauty, with its main functions including moisturizing lips, improving dryness, providing color, and protection. However, traditional lipsticks generally suffer from a technical defect of "drying sensation" during use. That is, they are moisturizing at the beginning of application, but after a period of time, the lips become drier, tighter, and may even peel or crack, seriously affecting the consumer experience.

[0003] Currently, to prolong makeup wear and prevent smudging, most commercially available lipsticks contain film-forming agents, such as polyethylene wax, acrylate copolymers, polyurethane, and silicone resins. These film-forming agents form a continuous hydrophobic film on the lip surface. While this can lock in some oil and resist friction, it also hinders the natural moisture exchange of the lip's stratum corneum. As the initial emollients (such as mineral oil and esters) in the product are gradually absorbed or evaporated, this hydrophobic film remains on the lips, further inhibiting the rebuilding of the sebum film and the dynamic balance of transepidermal water, leading to a "pulled" dryness sensation on the lips. Therefore, there is an urgent need to develop a lipstick with long-lasting moisturizing properties and no drying effect to meet consumer demand. Summary of the Invention

[0004] One objective of this application is to provide a thermo-pressure dual-trigger microcapsule and its preparation method, as well as a lipstick, which, when used, helps to increase moisturizing performance and lasting power, and reduce the feeling of dryness.

[0005] To achieve the above objectives, this application provides a thermo-pressure dual-trigger microcapsule suitable for lipsticks, comprising: a core material, the core material comprising a first core material component, a second core material component, and a third core material component; and a shell layer, the shell layer covering the outer periphery of the core material, the shell layer comprising a first shell layer component and a second shell layer component; the first core material component is at least one selected from squalane, hydrogenated polyisobutylene, caprylic / capric triglyceride, isononyl isononanoate, jojoba oil, squalene, and meadowfoam seed oil; the second core material component is at least one selected from vitamin E acetate, tocopherol, vitamin E linoleate, rosemary extract, and ascorbyl palmitate; the third core material component is at least one selected from phytosterols, cholesterol, phytosphoin, ceramide, and bisabolol; the first shell layer component is a polymethyl methacrylate cross-linked polymer; and the softening point of the second shell layer component is 30℃-50℃.

[0006] In some embodiments, the second shell component is at least one of polycaprolactone, jojoba wax, and polyhydroxyalkanoate; when the second shell component includes polycaprolactone, the number average molecular weight of polycaprolactone is 1000-3000.

[0007] In some embodiments, the thermobaric dual-trigger microcapsule satisfies at least one of the following conditions: (a) the mass ratio of the first core material component, the second core material component, and the third core material component is (65-75):(20-30):(2-10); (b) the mass ratio of the first shell component to the second shell component is (50-60):(40-50); (c) the shell layer further includes a shell compatibilizer, the shell compatibilizer being a polymethyl methacrylate-polycaprolactone block copolymer; the mass ratio of the first shell component, the second shell component, and the shell compatibilizer is (50-60):(35-50):(1-5); (d) the thickness of the shell layer is n1, n1 is 0.3μm-0.6μm, the maximum particle size of the thermobaric dual-trigger microcapsule is n2, and the ratio between n1 and n2 is (0.04-0.06):1.

[0008] To achieve the above objectives, this application provides a method for preparing thermo-pressure dual-trigger microcapsules, comprising the following steps: S100, mixing and heating a first core material component, a second core material component, a third core material component, a second shell component, a shell compatibilizer, methyl methacrylate, and ethylene glycol dimethacrylate, then adding an initiator to obtain an oil phase; S200, adding polyvinyl alcohol and sodium dodecyl sulfate to deionized water, heating to 70℃-90℃ and stirring to dissolve, obtaining an aqueous phase, wherein the mass fraction of polyvinyl alcohol in the aqueous phase is 1.5wt.%-3wt.%, and the mass fraction of sodium dodecyl sulfate is 0.2wt.%-0.8wt.%; S300, adding the... The oil phase is added to the aqueous phase for shear emulsification to obtain a first emulsion; S400, under an inert atmosphere, the first emulsion is heated and stirred, the first core material component, the second core material component and the third core material component form a core material, the methyl methacrylate and the ethylene glycol dimethacrylate undergo free radical copolymerization under the action of the initiator to form a first shell component, the first shell component and the second shell component form a shell, the shell covers the outer periphery of the core material, and a thermobaric dual-trigger microcapsule precursor is obtained; S500, after centrifugation and washing of the thermobaric dual-trigger microcapsule precursor, it is heated under vacuum conditions to obtain thermobaric dual-trigger microcapsules.

[0009] In some embodiments, the preparation method satisfies at least one of the following conditions: (a) in step S100, the mass ratio of the first core material component, the second core material component, the third core material component, the second shell component, the shell compatibilizer, the methyl methacrylate, the ethylene glycol dimethacrylate, and the initiator is (65-75):(20-30):(2-6):(15-25):(0.8-2.5):(15-30):(0.8-2.5):(0.1-0.8); (b) the initiator is azobisisobutyronitrile, and in step S100, the heating temperature is 55℃-65℃, and the heating time is 30min-60min; (c) The mass ratio of the oil phase to the water phase is 1:(5-8), the shear emulsification speed is 8000rpm-11000rpm, the shear emulsification time is 3min-15min, and the shear emulsification temperature is ≤28℃; (d) In step S400, the heating treatment temperature is 55℃-75℃, the heating rate is 1℃ / min-5℃ / min, and the stirring speed is 150rpm-250rpm; (e) In step S500, the centrifugal washing speed is 2500rpm-4000rpm, the vacuum degree in the vacuum condition is -0.1MPa to -0.08MPa, the heating treatment temperature is ≤25℃, and the heating treatment time is 10h-24h.

[0010] To achieve the above objectives, this application provides a lipstick comprising the thermo-pressure dual-trigger microcapsules as described above, or thermo-pressure dual-trigger microcapsules prepared by the aforementioned preparation method.

[0011] In some embodiments, the lipstick comprises: Phase A, comprising at least one of polyethylene wax, bis-diglycerol polyacryladiate-2, hydrogenated polyisobutylene, diisostearyl malate, and isostearyl isostearate; Phase B, comprising at least one of polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, phenyl polytrimethylsiloxane, and polyglycerol-2 triisostearyl; Phase C, comprising at least one of caprylyl glycol, tocopheryl acetate, and panthenol; Phase D, comprising at least one of a complex of hexamethylene diisocyanate / trimethylolhexyl lactone crosspolymer and silica, nylon-12, mica, silica, and a colorant; Phase E, comprising the thermobaric dual-trigger microcapsules, wherein Phase E further comprises at least one of phenyl polytrimethylsiloxane and hydrophobic fumed silica; and Phase F, wherein Phase F is a fragrance enhancer.

[0012] In some embodiments, the lipstick satisfies at least one of the following conditions: (a) the mass ratio of phase A, phase B, phase C, phase D, phase E, and phase F is (15-25):(35-45):(0.8-3):(15-25):(11-18):(0.1-0.5); (b) phase A comprises polyethylene wax, bis-diglycerol polyacryl adipate-2, hydrogenated polyisobutylene, diisostearyl malate, isostearyl isostearate, polyethylene wax, bis-diglycerol polyacryl adipate-2, hydrogenated polyisobutylene, diisostearyl malate, isostearyl isostearate, polyethylene wax, bis-diglycerol polyacryl adipate-2, hydrogenated polyisobutylene, diisostearyl malate, isostearyl isostearate, and hydrogenated polyisobutylene. The mass ratio of diglycerol polyacryladiate-2, hydrogenated polyisobutylene, diisostearyl malate, and isostearyl isostearate is (3-6):(6-9):(3-6):(1.5-4.5):(1.5-4.5); (c) Phase B comprises polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, phenyl polytrimethylsiloxane, polyglycerol-2 triisostearyl, polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, phenyl polytrimethylsiloxane, The mass ratio of polyglycerol-2 triisostearate is (15-25):(12-20):(3-6); (d) Phase C includes octyl glycol, tocopheryl acetate, and panthenol, with a mass ratio of octyl glycol, tocopheryl acetate, and panthenol of (0.2-0.8):(0.1-0.5):(0.3-1); (e) Phase D includes a complex of hexamethylene diisocyanate / trimethylolhexyl lactone crosspolymer and silica, nylon-12, mica, silica, colorant, and hexamethylene diisocyanate. The mass ratio of the ester / trimethylolhexyl lactone crosslinked polymer and silica complex, nylon-12, mica, silica and colorant is (4-8):(2-8):(1.5-5):(1-3):(6.5-9); (f) The E phase includes the thermo-pressure dual-trigger microcapsules, phenyl polytrimethylsiloxane, and hydrophobic fumed silica, and the mass ratio of the thermo-pressure dual-trigger microcapsules, phenyl polytrimethylsiloxane and hydrophobic fumed silica is (5-12):(3-7):(0.8-2).

[0013] To achieve the above objectives, this application also provides a method for preparing the aforementioned lipstick, comprising the following steps: A100, heating the A phase to 85℃-95℃ and stirring to obtain a first intermediate; A200, adding the B phase after cooling the first intermediate to 65℃-75℃ and stirring to obtain a second intermediate; A300, adding the C phase after cooling the second intermediate to 50℃-65℃ and stirring to obtain a third intermediate; A400, mixing the third intermediate with the D phase and grinding them using a three-roll mill to obtain a fourth intermediate, wherein the particle size of the fourth intermediate is 6μm-10μm; A500, in the... The fourth intermediate is cooled to 35℃-45℃ and allowed to stand, then stirred to obtain the fifth intermediate; A600, the components in phase E are stirred and mixed at 10℃-25℃ to obtain the first mixture; A700, the fifth intermediate is cooled to 20℃-35℃, and the fifth intermediate and the first mixture are stirred and mixed at 20℃-35℃ to obtain the sixth intermediate; A800, the temperature of the sixth intermediate is adjusted to 35℃-40℃ and then added to phase F, and stirred to obtain the seventh intermediate; A900, the seventh intermediate is cooled to 28℃-33℃ and added to a filling container to obtain the lipstick.

[0014] In some embodiments, the preparation method satisfies at least one of the following conditions: (a) in step A100, the stirring speed is 50 rpm-70 rpm, and the stirring time is 20 min-30 min; in step A200, the stirring speed is 100 rpm-150 rpm, and the stirring time is 10 min-30 min; (b) in step A300, the stirring speed is 80 rpm-120 rpm, and the stirring time is 5 min-12 min; in step A400, the roller spacing of the three-roll mill is 12 μm-40 μm, and the grinding pressure is 0.2 MPa- 0.6MPa; (c) In step A500, the settling time is 10min-30min, the stirring speed is 40rpm-80rpm, and the stirring time is 10min-20min; (d) In step A600, the stirring speed is 10rpm-40rpm, and the stirring time is 5min-30min; In step A700, the stirring speed is 20rpm-45rpm, and the stirring time is 5min-30min; (e) In step A800, the stirring speed is 20rpm-55rpm, and the stirring time is 2min-15min.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: Because the stratum corneum of the lips is thin and lacks sebaceous glands, it is prone to dryness, oxidation, and damage. A single moisturizing active ingredient cannot simultaneously meet the multiple needs of moisturizing, anti-oxidation, and barrier repair. This application utilizes a combination of a first core material component, a second core material component, and a third core material component. The first core material component provides excellent emollient and occlusive properties, reducing transepidermal water loss and helping to improve dryness. The second core material component provides excellent antioxidant properties while protecting other unsaturated components in the core material from oxidation. The third core material component helps repair the damaged lip barrier and alleviate cheilitis or peeling. Therefore, the core material facilitates integrated moisturizing, anti-oxidation, and repair care for the lips. Furthermore, the first shell layer component is a polymethyl methacrylate cross-linked polymer, a rigid material with high mechanical strength, good chemical inertness, and biocompatibility at room temperature, which helps maintain the structural integrity and impact resistance of the thermo-pressure dual-triggered microcapsules. Based on this, the softening point of the second shell component in the outer shell is 30℃-50℃. When the lipstick comes into contact with the lips, heat is transferred to the thermo-pressure dual-trigger microcapsules, causing the second shell component to soften or its modulus to decrease significantly. Simultaneously, the external force generated by the application action can cause the softened shell to rupture, thereby releasing the core material. Compared to directly adding moisturizing active substances to the lipstick base, which easily leads to an initial excess of moisturizing active substances on the lips after application and subsequent depletion, and is also easily sealed by film-forming agents, this application, by encapsulating the moisturizing active substances—that is, the core material—in thermo-pressure dual-trigger microcapsules, enables on-demand release, replenishing the moisturizing active substances in batches during multiple uses for continuous replenishment, reducing the risk of dryness or a pulling sensation. Furthermore, because the glass transition temperature of polymethyl methacrylate crosspolymer is much higher than room temperature, it maintains good mechanical strength during storage and transportation, and will not break even under slight pressure (such as friction within the lipstick tube). When not in use, such as when the operating temperature is ≤25℃, the second shell component is in a semi-crystalline or highly crystalline state. At this time, the modulus is high, and even if it is subjected to accidental impact, such as dropping or transportation vibration, the probability of breakage is low, which is beneficial to enhancing the structural integrity and impact resistance of the temperature and pressure dual-trigger microcapsule. Detailed Implementation

[0016] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0017] As used herein, the terms “prepared from” and “comprising” are synonymous. The terms “comprising,” “including,” “having,” “containing,” or any other variation thereof, as used herein, are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements and may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0018] When a quantity, concentration, or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range is disclosed as “1 to 5”, the described range should be interpreted as including ranges “1 to 4”, “1 to 3”, “1 to 2 and 4 to 5”, “1 to 3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range includes its endpoints and all integers and fractions within that range.

[0019] Approximate terms used in the specification and claims to modify quantities indicate that the invention is not limited to that specific quantity, but also includes acceptable modifications close to that quantity that do not alter the relevant essential function. Correspondingly, the use of "about," "approximately," etc., to modify a numerical value means that the invention is not limited to that precise value. In some instances, approximate terms may correspond to the precision of the instrument used to measure the value. In this application's specification and claims, scope definitions can be combined and / or interchanged, unless otherwise stated, these scopes include all subscopes contained therein.

[0020] This application provides a thermo-pressure dual-trigger microcapsule suitable for lipsticks, comprising: a core material, which includes a first core material component, a second core material component, and a third core material component; and a shell layer, which covers the outer periphery of the core material and includes a first shell layer component and a second shell layer component; the first core material component is at least one selected from squalane, hydrogenated polyisobutylene, caprylic / capric triglyceride, isononyl isononanoate, jojoba oil, squalene, and meadowfoam seed oil; the second core material component is at least one selected from vitamin E acetate, tocopherol, vitamin E linoleate, rosemary extract, and ascorbyl palmitate; the third core material component is at least one selected from phytosterols, cholesterol, phytosphoin, ceramide, and bisabolol; the first shell layer component is a polymethyl methacrylate cross-linked polymer; and the softening point of the second shell layer component is 30℃-50℃.

[0021] Because the stratum corneum of the lips is thin and lacks sebaceous glands, it is prone to dryness, oxidation, and damage. A single moisturizing active ingredient cannot simultaneously meet the multiple needs of moisturizing, anti-oxidation, and barrier repair. This application utilizes a combination of a first core material component, a second core material component, and a third core material component. The first core material component provides excellent emollient and occlusive properties, reducing transepidermal water loss and helping to improve dryness. The second core material component provides excellent antioxidant properties while protecting other unsaturated components in the core material from oxidation. The third core material component helps repair the damaged lip barrier and alleviate cheilitis or peeling. Therefore, the core material facilitates integrated moisturizing, anti-oxidation, and repair care for the lips. Furthermore, the first shell layer component is a polymethyl methacrylate cross-linked polymer, a rigid material with high mechanical strength, good chemical inertness, and biocompatibility at room temperature, which helps maintain the structural integrity and impact resistance of the thermo-pressure dual-triggered microcapsules. Based on this, the softening point of the second shell component in the outer shell is 30℃-50℃. When the lipstick comes into contact with the lips, heat is transferred to the thermo-pressure dual-trigger microcapsules, causing the second shell component to soften or its modulus to decrease significantly. Simultaneously, the external force generated by the application action can cause the softened shell to rupture, thereby releasing the core material. Compared to directly adding moisturizing active substances to the lipstick base, which easily leads to an initial excess of moisturizing active substances on the lips after application and subsequent depletion, and is also easily sealed by film-forming agents, this application, by encapsulating the moisturizing active substances—that is, the core material—in thermo-pressure dual-trigger microcapsules, enables on-demand release, replenishing the moisturizing active substances in batches during multiple uses for continuous replenishment, reducing the risk of dryness or a pulling sensation. Furthermore, because the glass transition temperature of polymethyl methacrylate crosspolymer is much higher than room temperature, it maintains good mechanical strength during storage and transportation, and will not break even under slight pressure (such as friction within the lipstick tube). When not in use, such as when the operating temperature is ≤25℃, the second shell component is in a semi-crystalline or highly crystalline state. At this time, the modulus is high, and even if it is subjected to accidental impact, such as dropping or transportation vibration, the probability of breakage is low, which is beneficial to enhancing the structural integrity and impact resistance of the temperature and pressure dual-trigger microcapsule.

[0022] In some embodiments, the second shell component is at least one selected from polycaprolactone (PCL), jojoba wax, and polyhydroxyalkanoate; when the second shell component includes polycaprolactone, the number average molecular weight of polycaprolactone is 1000-3000. By selecting a suitable type of second shell component, it is beneficial to prepare thermobaric dual-trigger microcapsules with good structural integrity and impact resistance.

[0023] It is understandable that low molecular weight polycaprolactone (PCL) has lower crystallinity, and under the influence of lip temperature, partial melting occurs in the crystalline region of PCL, resulting in a decrease in elastic modulus. Furthermore, PCL with a number-average molecular weight of 1000-3000 has a lower melt viscosity at 60℃-70℃, facilitating mixing with monomer components and core materials; jojoba wax is liquid at 50℃-60℃, making it easy to handle. Based on this, low-melting-point polyhydroxyalkanoates can also be selected.

[0024] In some embodiments, the mass ratio of the first core material component, the second core material component, and the third core material component is (65-75):(20-30):(2-10). By selecting a suitable mass ratio of the first core material component, the second core material component, and the third core material component, it is beneficial to prepare thermobaric dual-trigger microcapsules with good structural integrity and impact resistance.

[0025] In some embodiments, the mass ratio of the first shell component to the second shell component is (50-60):(40-50). By selecting an appropriate mass ratio of the first shell component to the second shell component, it is beneficial to prepare thermobaric dual-trigger microcapsules with good structural integrity and impact resistance.

[0026] In some embodiments, the shell layer further includes a shell layer compatibilizer, which is a polymethyl methacrylate-polycaprolactone block copolymer; the mass ratio of the first shell layer component, the second shell layer component, and the shell layer compatibilizer is (50-60):(35-50):(1-5). It is worth noting that, due to the poor thermodynamic compatibility between polymethyl methacrylate (PMMA) and polycaprolactone (PCL), uneven blending, poor mechanical properties, and difficulty in uniform distribution of the second shell layer component are easily observed in the shell layer. Therefore, adding a shell layer compatibilizer is beneficial for obtaining a uniform, continuous shell layer free of macroscopic phase interface defects.

[0027] Based on this, polymethyl methacrylate-polycaprolactone block copolymer was selected as the shell compatibilizer. In the molecular chain of polymethyl methacrylate-polycaprolactone block copolymer (PMMA-b-PCL), one segment is compatible with PMMA (PMMA block) and the other segment is compatible with PCL (PCL block). Through the interfacial anchoring effect, it is beneficial to reduce the interfacial tension between the two phases and suppress phase separation.

[0028] In some embodiments, the shell thickness is n1, which is 0.3 μm-0.6 μm, and the maximum particle size of the thermobaric dual-trigger microcapsules is n2, with the ratio of n1 to n2 being (0.04-0.06):1. By selecting a shell of suitable thickness, good mechanical strength is achieved at room temperature, reducing the risk of breakage. When applied with lip temperature control, the core material can be released solely by the application force.

[0029] This application provides a method for preparing thermo-pressure dual-trigger microcapsules, comprising the following steps: S100, mixing and heating a first core material component, a second core material component, a third core material component, a second shell component, a shell compatibilizer, methyl methacrylate, and ethylene glycol dimethacrylate, then adding an initiator to obtain an oil phase; S200, adding polyvinyl alcohol and sodium dodecyl sulfate to deionized water, heating to 70℃-90℃ and stirring to dissolve, obtaining an aqueous phase, wherein the mass fraction of polyvinyl alcohol in the aqueous phase is 1.5wt.%-3wt.%, and the mass fraction of sodium dodecyl sulfate is 0.2wt.%-0.8wt.%. S300: The oil phase is added to the aqueous phase for shear emulsification to obtain the first emulsion; S400: Under an inert atmosphere, the first emulsion is heated and stirred, and the first core material component, the second core material component, and the third core material component form the core material. Methyl methacrylate and ethylene glycol dimethacrylate undergo free radical copolymerization under the action of an initiator to form the first shell component. The first shell component and the second shell component form the shell, which coats the outer periphery of the core material to obtain the thermobaric dual-trigger microcapsule precursor; S500: After centrifugation and washing of the thermobaric dual-trigger microcapsule precursor, it is heated under vacuum to obtain thermobaric dual-trigger microcapsules.

[0030] It is worth mentioning that in step S100, the components are mixed at the molecular level in the oil phase, laying the foundation for the subsequent formation of a uniform and continuous shell. Based on this, this step eliminates the need for additional stepwise pre-emulsification or pre-polymerization reactions, thus reducing the number of operational steps. In step S200, polyvinyl alcohol provides steric stabilization, and sodium dodecyl sulfate provides electrostatic repulsion; the synergistic effect of both helps reduce the oil-water interfacial tension, rapidly forming a water-in-oil emulsion with concentrated particle size and long-term stability under high-speed shear. In step S300, the oil phase is added to the aqueous phase for shear emulsification; the shear rate and time can be adjusted as needed to obtain oil droplets with an average particle size in the micrometer range. In step S400, free radical copolymerization of methyl methacrylate and ethylene glycol dimethacrylate is initiated, generating a polymethyl methacrylate crosslinked polymer network. Because the oil phase simultaneously contains a second shell component (such as low molecular weight PCL) and a shell compatibilizer (PMMA-b-PCL block copolymer), as the polymethyl methacrylate crosslinked polymer network gradually forms, one end of the shell compatibilizer is anchored to the PMMA phase, while the other end becomes entangled with the PCL molecular chains. This uniformly locks the PCL in the shell in a nanoscale domain, reducing the risk of macroscopic phase separation. This process achieves "one-step polymerization and in-situ shell formation," eliminating the need for additional curing agents or solvent evaporation, thus simplifying the preparation equipment and operating steps. Simultaneously, the components in the core material remain inert during polymerization and do not participate in the reaction, ultimately being completely encapsulated within the thermo-pressure dual-trigger microcapsules. In step S500, centrifugal washing removes unreacted monomers, free PCL, and emulsifiers. Subsequently, a heating treatment is performed under vacuum conditions. This avoids premature softening or melting of the second shell component due to high temperatures, while also facilitating the removal of residual moisture and trace amounts of solvent, resulting in powdered thermo-pressure dual-trigger microcapsules, which are easy to store and subsequently added to the lipstick matrix.

[0031] In some embodiments, in step S100, the mass ratio of the first core material component, the second core material component, the third core material component, the second shell component, the shell compatibilizer, methyl methacrylate, ethylene glycol dimethacrylate, and the initiator is (65-75):(20-30):(2-6):(15-25):(0.8-2.5):(15-30):(0.8-2.5):(0.1-0.8). By selecting appropriate mass ratios of the first core material component, the second core material component, the third core material component, the second shell component, the shell compatibilizer, methyl methacrylate, ethylene glycol dimethacrylate, and the initiator, it is beneficial to obtain thermobaric dual-trigger microcapsules with good structural integrity and impact resistance.

[0032] In some embodiments, the initiator is azobisisobutyronitrile (AIBN). In step S100, the temperature for heating is 55°C-65°C and the heating time is 30 min-60 min. By selecting appropriate preparation steps, it is beneficial to obtain thermobaric dual-trigger microcapsules with good structural integrity and impact resistance.

[0033] In some embodiments, the mass ratio of oil phase to water phase is 1:(5-8), the rotation speed of shear emulsification is 8000rpm-11000rpm, the shear emulsification time is 3min-15min, and the shear emulsification temperature is ≤28℃. By selecting appropriate preparation steps and parameters, it is beneficial to obtain thermobaric dual-trigger microcapsules with good structural integrity and impact resistance.

[0034] In some embodiments, in step S400, the temperature of the heating treatment is 55℃-75℃, the heating rate of the heating treatment is 1℃ / min-5℃ / min, and the stirring speed is 150rpm-250rpm. By selecting appropriate preparation steps, it is beneficial to obtain thermo-baric dual-trigger microcapsules with good structural integrity and impact resistance.

[0035] In some embodiments, in step S500, the centrifugal washing speed is 2500 rpm-4000 rpm, the vacuum degree in the vacuum condition is -0.1 MPa to -0.08 MPa, the temperature of the heating treatment is ≤25℃, and the heating treatment time is 10 h-24 h. By selecting appropriate preparation steps, it is beneficial to obtain thermobaric dual-trigger microcapsules with good structural integrity and shock resistance.

[0036] This application provides a lipstick comprising the aforementioned thermo-pressure dual-trigger microcapsules, or thermo-pressure dual-trigger microcapsules prepared by the aforementioned method. By using the thermo-pressure dual-trigger microcapsules provided in this application in the lipstick, it is beneficial to increase the moisturizing performance and lasting power of the lipstick when used, and reduce the feeling of dryness.

[0037] In some embodiments, the lipstick comprises: Phase A, comprising at least one of polyethylene wax, bis-diglyceryl polyacryladiate-2, hydrogenated polyisobutylene, diisostearyl malate, and isostearyl isostearate; Phase B, comprising at least one of polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, phenyl polytrimethylsiloxane, and polyglycerol-2 triisostearyl; Phase C, comprising at least one of caprylyl glycol, tocopheryl acetate, and panthenol; Phase D, comprising at least one of a complex of hexamethylene diisocyanate / trimethylolhexyl lactone crosspolymer and silica, nylon-12, mica, silica, and a colorant; Phase E, comprising thermo-pressure dual-trigger microcapsules, Phase E further comprising at least one of phenyl polytrimethylsiloxane and hydrophobic fumed silica; and Phase F, wherein Phase F is a fragrance enhancer. By using the thermo-pressure dual-trigger microcapsules provided in this application in the lipstick, it is beneficial to increase the moisturizing performance and lasting power of the lipstick when used by the user, and reduce the feeling of dryness.

[0038] In some embodiments, the flavoring agent can be a fragrance, and can also be adapted to different usage scenarios.

[0039] In some embodiments, the mass ratio of phases A, B, C, D, E, and F is (15-25):(35-45):(0.8-3):(15-25):(11-18):(0.1-0.5). Using appropriate amounts of phases A, B, C, D, E, and F in lipstick can improve the moisturizing performance and lasting power of the lipstick, and reduce dryness.

[0040] In some embodiments, phase A comprises polyethylene wax, bis-diglycerol polyacryl adipate-2, hydrogenated polyisobutylene, diisostearyl malate, and isostearyl isostearate. The mass ratio of polyethylene wax, bis-diglycerol polyacryl adipate-2, hydrogenated polyisobutylene, diisostearyl malate, and isostearyl isostearate is (3-6):(6-9):(3-6):(1.5-4.5):(1.5-4.5). By using phase A, which includes suitable components, in lipstick, it is beneficial to increase the moisturizing performance and lasting power of the lipstick when the user uses it, and reduce the dryness.

[0041] In some embodiments, phase B comprises polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, phenyl polytrimethylsiloxane, and polyglycerol-2 triisostearate, with a mass ratio of (15-25):(12-20):(3-6). By using phase B, which includes suitable components, in lipstick, it is beneficial to increase the moisturizing performance and lasting power of the lipstick when the user uses it, and reduce the feeling of dryness.

[0042] In some embodiments, phase C includes caprylyl glycol, tocopheryl acetate, and panthenol, with a mass ratio of caprylyl glycol, tocopheryl acetate, and panthenol of (0.2-0.8):(0.1-0.5):(0.3-1). By using phase C containing suitable components in lipstick, it is beneficial to increase the moisturizing performance and lasting power of the lipstick when the user uses it, and reduce the feeling of dryness.

[0043] In some embodiments, phase D comprises a complex of hexamethylene diisocyanate / trimethylolpropionic acid crosspolymer and silica, nylon-12, mica, silica, and a colorant. The mass ratio of the complex of hexamethylene diisocyanate / trimethylolpropionic acid crosspolymer and silica, nylon-12, mica, silica, and colorant is (4-8):(2-8):(1.5-5):(1-3):(6.5-9). By using phase D containing suitable components in the lipstick, it is beneficial to increase the moisturizing performance and lasting power of the lipstick when used, and reduce the dryness. The colorant can be selected from at least one of organic synthetic lakes, inorganic pigments, and pearlescent pigments.

[0044] In at least one specific embodiment, the organic synthetic lake is selected from at least one of CI 15850, CI 19140, CI 42090, CI 45380, and CI 45410; the inorganic pigment is selected from at least one of CI 77891, CI 77491, and CI 77492; and the pearlescent pigment is selected from at least one of CI 77163 and titanium dioxide / mica composite.

[0045] In some embodiments, phase E comprises thermobaric dual-trigger microcapsules, phenyl polytrimethylsiloxane, and hydrophobic fumed silica, with a mass ratio of (5-12):(3-7):(0.8-2). Using phase E containing suitable components in lipsticks can improve the moisturizing properties and lasting power of the lipstick, and reduce dryness.

[0046] This application also provides a method for preparing the aforementioned lipstick, comprising the following steps: A100, heating phase A to 85℃-95℃ and stirring to obtain a first intermediate; A200, cooling the first intermediate to 65℃-75℃ and adding phase B for stirring to obtain a second intermediate; A300, cooling the second intermediate to 50℃-65℃ and adding phase C for stirring to obtain a third intermediate; A400, mixing the third intermediate with phase D and grinding them using a three-roll mill to obtain a fourth intermediate, the fourth intermediate having a particle size of 6μm-10μm; A500, in the fourth intermediate... After cooling to 35℃-45℃ and allowing to stand, the mixture is stirred to obtain the fifth intermediate. A600: The components in phase E are stirred and mixed at 10℃-25℃ to obtain the first mixture. A700: The fifth intermediate is cooled to 20℃-35℃, and the fifth intermediate and the first mixture are stirred and mixed at 20℃-35℃ to obtain the sixth intermediate. A800: The temperature of the sixth intermediate is adjusted to 35℃-40℃, and phase F is added and stirred to obtain the seventh intermediate. A900: The seventh intermediate is cooled to 28℃-33℃ and added to a filling container to obtain the lipstick. By selecting appropriate preparation steps, it is beneficial to obtain a lipstick with good moisturizing properties and lasting power, reducing dryness.

[0047] In some embodiments, the stirring speed in step A100 is 50 rpm-70 rpm, and the stirring time is 20 min-30 min; the stirring speed in step A200 is 100 rpm-150 rpm, and the stirring time is 10 min-30 min. By selecting appropriate preparation steps, it is beneficial to obtain lipsticks with good moisturizing properties and lasting power, and to reduce the feeling of dryness.

[0048] In some embodiments, the stirring speed in step A300 is 80 rpm-120 rpm, and the stirring time is 5 min-12 min; the roller spacing of the three-roll mill in step A400 is 12 μm-40 μm, and the grinding pressure is 0.2 MPa-0.6 MPa; the settling time in step A500 is 10 min-30 min, the stirring speed is 40 rpm-80 rpm, and the stirring time is 10 min-20 min. By selecting appropriate preparation steps, it is beneficial to obtain lipsticks with good moisturizing properties and lasting power, and reduced dryness.

[0049] In some embodiments, the stirring speed in step A600 is 10 rpm-40 rpm, and the stirring time is 5 min-30 min; the stirring speed in step A700 is 20 rpm-45 rpm, and the stirring time is 5 min-30 min. By selecting appropriate preparation steps, it is beneficial to obtain lipsticks with good moisturizing properties and lasting power, and to reduce the feeling of dryness.

[0050] In some embodiments, the stirring speed in step A800 is 20 rpm-55 rpm, and the stirring time is 2 min-15 min. By selecting appropriate preparation steps, it is beneficial to obtain lipsticks with good moisturizing properties and lasting power, and to reduce the feeling of dryness.

[0051] Example 1 A thermobaric dual-trigger microcapsule, comprising: The core material includes: squalane, vitamin E acetate and bisabolol.

[0052] A shell layer, covering the outer periphery of the core material, comprises a first shell layer component, a second shell layer component, and a shell layer compatibilizer. The first shell layer component is a polymethyl methacrylate crosslinked polymer, the second shell layer component is a low molecular weight polycaprolactone with a number average molecular weight of 1800-2200, and the shell layer compatibilizer is a polymethyl methacrylate-polycaprolactone block copolymer. The composition includes 70 parts by weight of squalane, 25 parts by weight of vitamin E acetate, 5 parts by weight of bisabolol, 20 parts by weight of low molecular weight polycaprolactone, 1.3 parts by weight of the polymethyl methacrylate-polycaprolactone block copolymer, and 23.9 parts by weight of the polymethyl methacrylate crosslinked polymer.

[0053] The shell thickness is n1, which is 0.55 μm. The maximum particle size of the thermo-pressure dual-trigger microcapsules is n2, and the ratio between n1 and n2 is 0.055:1.

[0054] A method for preparing thermobaric dual-trigger microcapsules includes the following steps: S100. In a nitrogen atmosphere, the first core material component, the second core material component, the third core material component, the second shell component, the shell compatibilizer, methyl methacrylate, ethylene glycol dimethacrylate and azobisisobutyronitrile are mixed and stirred at 60°C for 35 min and at a stirring speed of 250 rpm to obtain an oil phase. S200. Polyvinyl alcohol and sodium dodecyl sulfate are added to deionized water, heated to 80°C, stirred and dissolved, cooled to room temperature, and filtered to obtain an aqueous phase. The mass fraction of polyvinyl alcohol in the aqueous phase is 2.5 wt.%, and the mass fraction of sodium dodecyl sulfate is 0.5 wt.%. S300. The oil phase is added to the aqueous phase for shear emulsification to obtain the first emulsion. The mass ratio of the oil phase to the aqueous phase is 1:6. The shear emulsification speed is 10000 rpm, the shear emulsification time is 12 min, and the shear emulsification temperature is 25℃. S400. Under an inert atmosphere, the first emulsion is heated and stirred. The first core material component, the second core material component, and the third core material component form a core material. Methyl methacrylate and ethylene glycol dimethacrylate undergo free radical copolymerization under the action of azobisisobutyronitrile to form the first shell component. The first shell component and the second shell component form a shell, thus obtaining a thermobaric dual-trigger microcapsule precursor. The stirring speed is 200 rpm, the heating temperature is 70℃, the heating rate is 1℃ / min, and the heating time is 6h. The mass fraction of the first core material component is 70, the mass fraction of the second core material component is 25, the mass fraction of the third core component is 5, the mass fraction of the second shell component is 20, the mass fraction of the shell compatibilizer is 1.3, the mass fraction of methyl methacrylate is 25, the mass fraction of ethylene glycol dimethacrylate is 1.6, and the mass fraction of azobisisobutyronitrile is 0.3. After centrifuging and washing the S500 microcapsule precursor three times, the microcapsules were prepared by heating under vacuum conditions. The centrifugation speed was 3000 rpm, the vacuum level was -0.09 MPa, the heating temperature was 20℃, and the heating time was 12 h. The residual amount of methyl methacrylate in the prepared microcapsules was detected by headspace gas chromatography, and the residual amount of methyl methacrylate was less than 100 ppm.

[0055] A lipstick includes phases A, B, C, D, E, and F, wherein: Phase A includes 4.5g polyethylene wax, 7.5g bis-diglycerol polyacryl adipate-2, 4.5g hydrogenated polyisobutylene, 3g diisostearyl malate, and 2.5g isostearyl isostearate. Phase B includes 20g of polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer, 15g of phenyl polytrimethylsiloxane, and 4g of polyglycerol-2 triisostearate. Phase C includes 0.5g octyl glycol, 0.2g tocopheryl acetate, and 0.8g panthenol; Phase D comprises a complex of 6g hexamethylene diisocyanate / trimethylolpropionic acid crosslinked polymer and silica, 5g nylon-12, 3.5g mica, 1.5g silica, 7g CI 15850, and 0.3g CI 77499. Phase E includes 8g of thermobaric dual-trigger microcapsules, 4.7g of phenyl polytrimethylsiloxane, and 1.2g of hydrophobic fumed silica; Phase F includes 0.3g of fragrance.

[0056] A method for preparing a lipstick, comprising the following steps: A100. Heat phase A to 92°C and stir to obtain the first intermediate. The stirring speed is 60 rpm and the stirring time is 28 min. A200: After the first intermediate is cooled to 72°C, phase B is added and stirred to obtain the second intermediate. The stirring speed is 120 rpm and the stirring time is 20 min. A300, after the second intermediate is cooled to 55°C, the C phase is added and stirred to obtain the third intermediate. The stirring speed is 100 rpm and the stirring time is 8 min. A400, a third intermediate, and the D phase were mixed and ground using a three-roll mill to obtain a fourth intermediate with a particle size of 8.2 μm. A500: After the fourth intermediate is cooled to 40°C, it is allowed to stand for 15 minutes, and then stirred to obtain the fifth intermediate. The stirring speed is 60 rpm and the stirring time is 15 minutes. A600, the components in phase E are stirred and mixed at 20°C to obtain the first mixture. The stirring speed is 20 rpm and the stirring time is 10 min. A700: Cool the fifth intermediate to 30°C, and stir and mix the fifth intermediate and the first mixture at 30°C to obtain the sixth intermediate. The stirring speed is 30 rpm and the stirring time is 20 min. A800, after adjusting the temperature of the sixth intermediate to 38℃, add phase F and stir to obtain the seventh intermediate. The stirring speed is 50 rpm and the stirring time is 3 min. A900: Cool the seventh intermediate to 33°C, add the seventh intermediate to a filling container, and obtain the lipstick.

[0057] Example 2 The difference between Example 2 and Example 1 is that the amount of temperature-pressure dual-trigger microcapsules used in the preparation of the lipstick is increased to 12g.

[0058] Example 3 The difference between Example 3 and Example 1 is that the amount of temperature-pressure dual-trigger microcapsules used in the preparation of the lipstick is increased to 5g.

[0059] Example 4 The difference between Example 4 and Example 1 is that the rotation speed of shear emulsification in step S300 is adjusted to increase the shell thickness to 0.6 μm.

[0060] Example 5 The difference between Example 5 and Example 1 is that the rotation speed of shear emulsification in step S300 is adjusted to reduce the shell thickness to 0.4 μm.

[0061] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the lipstick did not contain thermo-pressure dual-trigger microcapsules.

[0062] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the preparation steps of the thermo-pressure dual-trigger microcapsules are replaced by the microcapsule preparation steps. The microcapsule preparation steps are as follows: blending squalane, vitamin E acetate, bisabolol, polymethyl methacrylate crosspolymer, low molecular weight polycaprolactone with a number average molecular weight of 1800-2200, and polymethyl methacrylate-polycaprolactone block copolymer, and grinding to obtain powdered microcapsules. The mass fractions are: 70 parts squalane, 25 parts vitamin E acetate, 5 parts bisabolol, 18 parts low molecular weight polycaprolactone, 1.3 parts polymethyl methacrylate-polycaprolactone block copolymer, and 23.9 parts polymethyl methacrylate crosspolymer.

[0063] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that only a shell is provided in the thermo-pressure dual-trigger microcapsule.

[0064] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that only the core material is provided in the thermo-pressure dual-trigger microcapsule.

[0065] Comparative Example 5 The temperature-pressure dual-trigger microcapsules in Comparative Example 5 were the same as those in Example 1, but the volunteers applied them with a lower application force than normal and applied them repeatedly to achieve the effect of applying them with normal application force.

[0066] Performance testing As shown in Tables 1-4, the lipsticks prepared in Examples 1-5 and Comparative Examples 1-5 were subjected to performance tests. First, in an environment with room temperature (23±2℃) and relative humidity of 50±10%, 20 healthy female volunteers aged 25-45 years were asked to evenly apply (application force > 0.8N) the lipsticks prepared in Examples 1-5 and Comparative Examples 1-4 to their lips. The lipstick prepared in Comparative Example 5 was applied with a lower application force (application force ≤ 0.5N) and repeatedly applied multiple times to achieve the effect of applying with normal application force. The average lip moisture content difference compared to the unapplication state at 0h, 1h, 2h, 4h, and 6h after application was measured using a Corneometer CM825 skin moisture meter. The lip color difference compared to the initial application state at 0h, 1h, 2h, 4h, and 6h after application was measured using a Konica Minolta CM-700d spectrophotometer.

[0067] Among them, the lip moisture content value was U0 when no application was made, and the lip moisture content value was U after n hours of application.n The difference in lip moisture content at time n is ΔU = (U n -U0). The lip color before application is (L0, a0, b0), and the lip color after application is (L...). n a n b n ), the lip color difference value ΔE at time n = [(L n -L0) 2 +(a n -a0) 2 +(b n -b0) 2 ] 0.5 .

[0068] The lipsticks prepared in Examples 1-5 and Comparative Examples 1-5 were stored at 40°C for 24 hours, and then at 20°C for 24 hours. This process was repeated 10 times before volunteers were tested. The average lip moisture content and lip color difference ΔE were recorded at different times after application.

[0069] Table 1. Statistical table of differences in lip moisture content before and after lipstick application in each example and comparative example.

[0070] Table 2. Statistical table of lip color difference before and after lipstick application in each example and comparative example.

[0071] Table 3. Statistical table of differences in lip moisture content before and after use for heat-treated lipsticks in each embodiment and comparative example.

[0072] Table 4. Statistical table of lip color difference before and after use for heat-treated lipsticks in each embodiment and comparative example.

[0073] As demonstrated in Examples 1-5 and Comparative Examples 1-5, both the temperature and pressure conditions required for the release of the internal core material from the thermo-pressure dual-trigger microcapsules in this application are indispensable. When the shell thickness of the thermo-pressure dual-trigger microcapsules is too large, a noticeable gritty feeling is produced when applying lipstick, and an excessively thick shell requires greater external force to rupture at body temperature, potentially leading to insufficient release of the core material. When the shell thickness of the thermo-pressure dual-trigger microcapsules is too small, the encapsulation rate of the shell is low, the risk of core material leakage is high, and the capsules are prone to rupture during preparation and storage.

[0074] When the amount of thermo-pressure dual-trigger microcapsules used is too large, the number of microcapsules in contact with the lips per unit area increases, and the excessively high density may produce a powdery feel. Furthermore, during application, a large number of thermo-pressure dual-trigger microcapsules rupture simultaneously, releasing a large amount of oily components such as squalane. Excessive lubrication can reduce the adhesion of the pigment to the lips, further reducing colorfastness. When the amount of thermo-pressure dual-trigger microcapsules used is too small, the total amount of moisturizing active ingredients such as squalane released is insufficient, and the content of antioxidants released, such as vitamin E linoleate, is low, making it difficult to inhibit pigment oxidation and makeup fading.

[0075] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A temperature- and pressure-triggered microcapsule suitable for lipstick, characterized in that, include: The core material includes a first core material component, a second core material component, and a third core material component; A shell layer, which covers the outer periphery of the core material, and the shell layer includes a first shell layer component and a second shell layer component; The first core material component is at least one of squalane, hydrogenated polyisobutylene, caprylic / capric triglyceride, isononyl isononanoate, jojoba oil, squalene, and meadowfoam seed oil; The second core material component is at least one of vitamin E acetate, tocopherol, vitamin E linoleate, rosemary extract, and ascorbyl palmitate; The third core material component is at least one of phytosterols, cholesterol, phytosphoprotein, ceramide, and bisabolol; The first shell component is a polymethyl methacrylate crosslinked polymer; The softening point of the second shell component is 30℃-50℃.

2. The thermobaric dual-trigger microcapsule according to claim 1, characterized in that, The second shell component is at least one of polycaprolactone, jojoba wax, and polyhydroxyalkanoate; when the second shell component includes polycaprolactone, the number average molecular weight of polycaprolactone is 1000-3000.

3. The thermobaric dual-trigger microcapsule according to claim 1 or 2, characterized in that, The thermobaric dual-trigger microcapsule satisfies at least one of the following conditions: (a) The mass ratio of the first core material component, the second core material component, and the third core material component is (65-75):(20-30):(2-10); (b) The mass ratio of the first shell component to the second shell component is (50-60):(40-50); (c) The shell layer further includes a shell layer compatibilizer, which is a polymethyl methacrylate-polycaprolactone block copolymer; the mass ratio of the first shell layer component, the second shell layer component and the shell layer compatibilizer is (50-60):(35-50):(1-5); (d) The thickness of the shell is n1, n1 is 0.3μm-0.6μm, the maximum particle size of the thermo-pressure dual-trigger microcapsule is n2, and the ratio between n1 and n2 is (0.04-0.06):

1.

4. A method for preparing thermo-baric dual-trigger microcapsules, characterized in that, Including the following steps: S100, after mixing and heating the first core material component, the second core material component, the third core material component, the second shell component, the shell compatibilizer, methyl methacrylate, and ethylene glycol dimethacrylate, an initiator is added to obtain the oil phase; S200. Polyvinyl alcohol and sodium dodecyl sulfate are added to deionized water, heated to 70℃-90℃, and stirred to dissolve, yielding an aqueous phase. The mass fraction of polyvinyl alcohol in the aqueous phase is 1.5wt.%-3wt.%, and the mass fraction of sodium dodecyl sulfate is 0.2wt.%-0.8wt.%. S300: The oil phase is added to the aqueous phase for shear emulsification to obtain a first emulsion; S400. Under an inert atmosphere, the first emulsion is heated and stirred. The first core material component, the second core material component, and the third core material component form a core material. The methyl methacrylate and the ethylene glycol dimethacrylate undergo free radical copolymerization under the action of the initiator to form a first shell component. The first shell component and the second shell component form a shell. The shell covers the outer periphery of the core material, thus obtaining a thermobaric dual-trigger microcapsule precursor. S500. After centrifugation and washing of the temperature-pressure dual-trigger microcapsule precursor, the temperature-pressure dual-trigger microcapsules are heated under vacuum conditions to obtain the temperature-pressure dual-trigger microcapsules.

5. The preparation method according to claim 4, characterized in that, The preparation method satisfies at least one of the following conditions: (a) In step S100, the mass ratio of the first core material component, the second core material component, the third core material component, the second shell component, the shell compatibilizer, the methyl methacrylate, the ethylene glycol dimethacrylate, and the initiator is (65-75):(20-30):(2-6):(15-25):(0.8-2.5):(15-30):(0.8-2.5):(0.1-0.8); (b) The initiator is azobisisobutyronitrile, and in step S100, the temperature for heating is 55℃-65℃ and the heating time is 30min-60min. (c) The mass ratio of the oil phase to the water phase is 1:(5-8), the rotation speed of shear emulsification is 8000rpm-11000rpm, the shear emulsification time is 3min-15min, and the shear emulsification temperature is ≤28℃. (d) In step S400, the temperature of the heating treatment is 55℃-75℃, the heating rate of the heating treatment is 1℃ / min-5℃ / min, and the stirring speed is 150rpm-250rpm. (e) In step S500, the centrifugal washing speed is 2500rpm-4000rpm, the vacuum degree in the vacuum condition is -0.1MPa to -0.08MPa, the temperature of the heating treatment is ≤25℃, and the heating treatment time is 10h-24h.

6. A lipstick, characterized in that, This includes the thermobaric dual-trigger microcapsules as described in any one of claims 1-3, or the thermobaric dual-trigger microcapsules prepared by the preparation method described in claim 4 or 5.

7. The lipstick according to claim 6, characterized in that, The lipstick includes: Phase A includes at least one of polyethylene wax, bis-diglycerol polyacryl adipate-2, hydrogenated polyisobutylene, diisostearyl malate, and isostearyl isostearate; Phase B includes at least one of polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer, phenyl polytrimethylsiloxane, and polyglycerol-2 triisostearate. Phase C includes at least one of octyl glycol, tocopheryl acetate, and panthenol; Phase D includes at least one of the following: a complex of hexamethylene diisocyanate / trimethylolhexyl lactone crosslinked polymer and silica; nylon-12; mica; silica; and colorant. Phase E includes the thermo-baric dual-trigger microcapsule, and Phase E further includes at least one of phenyl polytrimethylsiloxane and hydrophobic fumed silica. Phase F, wherein Phase F is a flavor enhancer.

8. The lipstick according to claim 7, characterized in that, The lipstick meets at least one of the following conditions: (a) The mass ratio of phase A, phase B, phase C, phase D, phase E to phase F is (15-25):(35-45):(0.8-3):(15-25):(11-18):(0.1-0.5); (b) Phase A comprises polyethylene wax, bis-diglycerol polyacryl adipate-2, hydrogenated polyisobutylene, diisostearyl malate, and isostearyl isostearate. The mass ratio of polyethylene wax, bis-diglycerol polyacryl adipate-2, hydrogenated polyisobutylene, diisostearyl malate, and isostearyl isostearate is (3-6):(6-9):(3-6):(1.5-4.5):(1.5-4.5). (c) The B phase comprises polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer, phenyl polytrimethylsiloxane, and polyglycerol-2 triisostearate, wherein the mass ratio of polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer, phenyl polytrimethylsiloxane, and polyglycerol-2 triisostearate is (15-25):(12-20):(3-6); (d) The C phase comprises octyl glycol, tocopheryl acetate, and panthenol, with a mass ratio of octyl glycol, tocopheryl acetate, and panthenol of (0.2-0.8):(0.1-0.5):(0.3-1). (e) The D phase comprises a complex of hexamethylene diisocyanate / trimethylolhexyl lactone crosslinked polymer and silica, nylon-12, mica, silica, and colorant, wherein the mass ratio of the complex of hexamethylene diisocyanate / trimethylolhexyl lactone crosslinked polymer and silica, nylon-12, mica, silica, and colorant is (4-8):(2-8):(1.5-5):(1-3):(6.5-9); (f) The E phase includes the thermo-pressure dual-trigger microcapsule, phenyl polytrimethylsiloxane, and hydrophobic fumed silica, and the mass ratio of the thermo-pressure dual-trigger microcapsule, phenyl polytrimethylsiloxane, and hydrophobic fumed silica is (5-12):(3-7):(0.8-2).

9. A method for preparing the lipstick as described in claim 7 or 8, characterized in that, Including the following steps: A100, heating the A phase to 85℃-95℃ and stirring to obtain the first intermediate; A200: After cooling the first intermediate to 65℃-75℃, phase B is added and stirred to obtain the second intermediate; A300: After the second intermediate is cooled to 50℃-65℃, the C phase is added and stirred to obtain the third intermediate; A400, the third intermediate is mixed with the D phase and ground by a three-roll mill to obtain a fourth intermediate, the fourth intermediate having a particle size of 6μm-10μm; A500: After the fourth intermediate is cooled to 35℃-45℃, it is allowed to stand and then stirred to obtain the fifth intermediate. A600, the components in phase E are stirred and mixed at 10℃-25℃ to obtain a first mixture; A700: Cool the fifth intermediate to 20°C-35°C, and stir and mix the fifth intermediate with the first mixture at 20°C-35°C to obtain the sixth intermediate; A800: After adjusting the temperature of the sixth intermediate to 35℃-40℃, add the F phase and stir to obtain the seventh intermediate; A900: Cool the seventh intermediate to 28℃-33℃, add the seventh intermediate to a filling container, and obtain lipstick.

10. The preparation method according to claim 9, characterized in that, The preparation method satisfies at least one of the following conditions: (a) In step A100, the stirring speed is 50 rpm-70 rpm and the stirring time is 20 min-30 min; in step A200, the stirring speed is 100 rpm-150 rpm and the stirring time is 10 min-30 min. (b) In step A300, the stirring speed is 80 rpm-120 rpm and the stirring time is 5 min-12 min; in step A400, the roller spacing of the three-roll mill is 12 μm-40 μm and the grinding pressure is 0.2 MPa-0.6 MPa; in step A500, the settling time is 10 min-30 min, the stirring speed is 40 rpm-80 rpm, and the stirring time is 10 min-20 min. (c) In step A600, the stirring speed is 10 rpm-40 rpm and the stirring time is 5 min-30 min; in step A700, the stirring speed is 20 rpm-45 rpm and the stirring time is 5 min-30 min. (d) The stirring speed in step A800 is 20rpm-55rpm and the stirring time is 2min-15min.

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