CN114891149A - Porous structure material for patch type mask base material, patch type mask containing porous structure material and preparation method of patch type mask - Google Patents
Porous structure material for patch type mask base material, patch type mask containing porous structure material and preparation method of patch type mask Download PDFInfo
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- CN114891149A CN114891149A CN202210377632.4A CN202210377632A CN114891149A CN 114891149 A CN114891149 A CN 114891149A CN 202210377632 A CN202210377632 A CN 202210377632A CN 114891149 A CN114891149 A CN 114891149A
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- porous structure
- water
- oil phase
- structure material
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Abstract
The invention discloses a porous structure material for a patch type facial mask base material, a patch type facial mask containing the same and a preparation method of the porous structure material, wherein the porous structure material is formed by polymerizing high internal phase emulsion, and compared with traditional base materials such as non-woven fabric, silk, pectin fiber and other natural fibers, hydrogel and other materials, the facial mask base material has higher liquid carrying rate and liquid retention amount, better air permeability and good skin fitting property, can achieve a good antibacterial effect by regulating and controlling the structure composition, and has better comprehensive performance compared with the traditional facial mask base material.
Description
Technical Field
The invention relates to the technical field of porous materials and skin care products, in particular to a porous structure material for a patch type facial mask base material, a patch type facial mask containing the porous structure material and a preparation method of the patch type facial mask.
Background
At present, common facial masks in the market are mainly divided into a mud paste type, a tearing type, a patch type and the like for smearing, wherein more than 80 percent of the facial masks are patch type. The base material (base cloth) of the patch type facial mask mainly comprises a plurality of materials such as non-woven fabric, hydrogel and biological fibers, wherein the non-woven fabric is the most common, the commonly used non-woven fabric facial mask base material comprises pure cotton fibers, viscose fibers, silk fibers, cuprammonium fibers, tencel fibers and the like, the traditional non-woven fabric has poor skin adhesion degree and low absorption capacity, facial mask essence is easy to drip, the liquid retention capacity is low, and the air permeability is general; the hydrogel mask has good skin fitting degree and mild property, but has low liquid carrying rate and poor air permeability, is uncomfortable to apply for a long time, and has certain limitation on adaptable mask essence. In order to ensure the performance effect within the service life of the mask patches, most of them need to add certain content of antiseptic and bacteriostatic components, such as sodium benzoate, p-hydroxybenzoate, methylisothiazolinone and the like, into the mask liquid, and the components have certain sensitization and stimulation effects on the skin.
In order to solve the existing problems, patent CN107349111B discloses different applications of metal-organic framework materials and covalent organic framework materials in cleansing facial masks, anti-allergy facial masks and functional facial masks, in the invention, the porous framework material is used as a component to be applied to the smearing facial mask, and the structure and the component of the porous framework material are adjusted according to different application fields. Patent CN11534926B discloses a high porosity facial mask base fabric prepared by milk protein cellulose composite spinning and a preparation method thereof, compared with the traditional non-woven facial mask base fabric, the high porosity facial mask base fabric has the advantages of high porosity, good air permeability and good moisture absorption, but the preparation is tedious, the preparation cost is high, the shrinkage rate is large and unstable, and antiseptic and bacteriostatic components need to be added.
The innovation of the currently disclosed patch type facial mask base material focuses on non-woven fabric materials, but the problems in the prior art cannot be completely solved.
Disclosure of Invention
Compared with the mask base material disclosed by the prior art, the mask base material has the advantages of high liquid carrying rate and liquid retention, good skin fitting property, good air permeability, wide adaptability to mask essence, capability of realizing self-carried antibacterial effect, strong industrial realizability and the like.
The invention also aims to use the porous structure material as a patch type mask.
The invention further aims to provide a preparation method of the patch type mask taking the porous structure material as the base cloth.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a porous structure material for a surface mount type mask base material is obtained by polymerizing a water-in-oil type high internal phase emulsion, the number average pore diameter of the porous structure material is 1-100 mu m, the porosity is not lower than 60%, the thickness after wet saturation is not higher than 1mm, and the transverse and longitudinal bending rigidity of the porous structure material is not more than 0.2gf cm 2 /cm。
In a specific embodiment, the porous structure material has a number average cell diameter of 1 to 50 μm, a porosity of 70 to 90%, a thickness after wet saturation of 0.05 to 1mm, and transverse and longitudinal flexural rigidities of 0.001 to 0.2gf cm 2 /cm。
In a specific embodiment, when the porous structure material is used as a mask substrate, the liquid carrying rate of the mask liquid with different viscosities is not less than 1000%, and is preferably 1000-3000%.
In a specific embodiment, when the porous structure material is used as a mask substrate, the liquid retention rate of the mask liquid with different viscosities is not less than 80%, and preferably 80% to 95%.
In another aspect, a patch type mask is made of a porous structure material containing the substrate for the patch type mask.
In another aspect, a method for preparing the patch type mask includes the following steps:
1) preparing a water-in-oil emulsion comprising an oil phase which is dispersed under shear to form a homogeneous oil phase, the temperature of the oil phase being maintained at 20-90 ℃; wherein the oil phase comprises, based on the total weight of the oil phase:
a)80 to 99 weight percent of a substantially water-insoluble monomer component;
b) 1-20% by weight of an emulsifier component soluble in the oil phase and capable of forming a stable water-in-oil emulsion;
2) the water phase comprises 0.5 to 15 weight percent of water-soluble inorganic salt based on the total weight of the water phase, and the temperature of the water phase is maintained between 20 and 90 ℃; preferably, the oil phase also comprises water-soluble or oil-soluble initiator accounting for 1-10 percent of the total weight of the monomers based on the total weight of the monomers of the oil phase;
3) gradually adding the water phase into the oil phase under the shearing action to emulsify into a stable HIPEP emulsion; preferably at a shear rate of 50rpm to 5000 rpm;
4) curing the water-in-oil emulsion to form a porous structure material; preferably, the emulsified HIPEP emulsion is coated in a thickness of 0.05-1 mm, and then is cured in an oven or a water bath or a UV box, preferably at the curing temperature of 45-120 ℃ for 5 s-30 min;
5) and (3) washing, squeezing and dehydrating the cured porous material, and directly soaking the cured porous material into the prepared mask essence without drying until the porous material is saturated and absorbed to obtain the mask.
In a specific embodiment, the mass ratio of the water phase volume to the oil phase in the HIPE emulsion in the step 3) is not lower than 20 mL: 1g, preferably 20mL to 40 mL: 1g of the total weight of the composition.
In a specific embodiment, the monomer component in step 1) is selected from alkyl acrylate monomers or alkyl styrene monomers containing one or more carbon-carbon double bonds; preferably, the oil phase a) further comprises hydrophobic modified nano zinc oxide accounting for 0-3% of the total weight of the oil phase, preferably 0.05-3%.
In a specific embodiment, the oil phase a) further comprises cellulose nanoparticles, wherein the cellulose nanoparticles are added in an amount of 0-2% of the total weight of the oil phase; preferably, the cellulose nanoparticles are selected from any one of cellulose nanocrystals, microcrystalline cellulose, cellulose nanofibers, nanocrystalline cellulose, nanocellulose.
In a specific embodiment, the glass transition temperature of the porous structure material after being cured in the step 5) is in the range of-30 ℃ to 25 ℃ after being dried.
Compared with the prior art, the porous structure material facing film substrate has the following beneficial effects:
the porous structure material suitable for the patch type facial mask base material is creatively prepared by utilizing high internal phase emulsion polymerization, and compared with the existing traditional non-woven fabric base materials, hydrogel base materials and various cellulose material base materials, the porous structure material has good absorptivity for low-viscosity and high-viscosity facial mask essence, prevents the facial mask liquid from dripping in the taking process, and improves the utilization rate and the application range of the facial mask essence; in addition, the hydrophobic modified nano zinc oxide mask serving as a mask base material has good air permeability and good skin fit, and has a good antibacterial effect when the hydrophobic modified nano zinc oxide is preferably contained, so that the hydrophobic modified nano zinc oxide mask does not need to be added with a preservative, and is safer for skin. The porous structure material has balanced performances in all aspects, good comprehensive performance and better application prospect in a patch type mask base material, and is a porous structure material suitable for the mask base material and prepared by initiatively utilizing the high internal phase emulsion.
Drawings
Fig. 1 is an SEM (1000 times magnification) spectrum of a porous structure material suitable for a patch-type mask substrate prepared in example 1 of the present invention.
Detailed Description
The following examples will further illustrate the method provided by the present invention in order to better understand the technical solution of the present invention, but the present invention is not limited to the listed examples, and should also include any other known modifications within the scope of the claims of the present invention.
A method for preparing a porous structure material for a patch type mask substrate by using a High Internal Phase Emulsion (HIPE), comprising the following steps:
1) preparing a water-in-oil emulsion comprising an oil phase comprising, based on the total weight of the oil phase:
a) from 80% to 99% by weight of a substantially water-insoluble monomer component, substantially water-insoluble meaning that the monomer is slightly soluble, poorly soluble or insoluble in water at 20 ℃;
b) 1-20% by weight of an emulsifier component soluble in the oil phase and capable of forming a stable water-in-oil emulsion;
2) ultrasonically treating the oil phase in an ultrasonic oscillator to obtain uniform oil phase, and maintaining the temperature of the oil phase at 20-90 deg.C;
3) the water phase comprises 0.5 to 15 weight percent of water-soluble inorganic salt based on the total weight of the water phase, and the temperature of the water phase is maintained between 20 and 90 ℃; gradually adding the water phase into the oil phase under the shearing action to emulsify into a stable HIPEP emulsion;
4) curing the water-in-oil emulsion to form a porous structure material; preferably, the mixture is put into a UV box or an oven or a water bath or steam for curing;
5) the solidified porous material is directly immersed into the prepared facial mask essence liquid without drying after washing, squeezing and dewatering until the porous material is saturated and absorbed.
Wherein the water phase of the water-in-oil emulsion comprises:
a) 0.5-15% by weight of water-soluble electrolyte based on the weight of the aqueous phase, wherein the electrolyte is water-soluble inorganic salt; preferably, the water-soluble inorganic salt is selected from monovalent, divalent inorganic salts of alkali metals and halide or sulfate salts of alkali metals;
b) water-soluble or oil-soluble initiator accounting for 1-10% of the total weight of the monomers of the oil phase; preferably, the initiator is selected from photoinitiators, such as at least any one of diphenylketones, alpha-hydroxyacetophenones, benzyl ketals, alpha-aminoalkylphenones, or acylphosphine oxides; it is also possible to select persulfates, azobisisobutyramidine hydrochloride, or redox initiation systems, such as sodium persulfate, ammonium persulfate, potassium persulfate, azobisisobutylamidine dihydrochloride, azobisisobutylimidazoline hydrochloride, or at least one of persulfate-sodium bisulfite, persulfate-ascorbic acid, persulfate-sodium thiosulfate, and the like.
Wherein the weight ratio of the water phase volume of the water-in-oil emulsion to the oil phase is not less than 20 mL: 1g, for example 25 mL: 1g, 30 mL: 1g, 35 mL: 1g, 40 mL: 1g, 50 mL: 1g, 60 mL: 1g, preferably 20mL to 40 mL: 1g of the total weight of the composition.
Wherein the monomer component in a) of the oil phase comprises:
i) from 60 to 95 weight percent, based on the total weight of monomers contained in the oil phase, of at least one substantially water-insoluble monofunctional comonomer; preferably, the monofunctional comonomer is selected from styrene, alkyl acrylate, alkyl methacrylate and mixtures thereof; more preferably, from 70% to 90% by weight of a monomer component selected from: acrylic acid C 4 -C 18 Alkyl esters, methacrylic acid C 4 -C 18 Alkyl ester esters, styrene, alkylstyrene, and mixtures thereof;
ii) 5 to 40 weight percent, based on the total weight of monomers contained in the oil phase, of at least one substantially water-insoluble polyfunctional crosslinking agent; preferably, the multifunctional crosslinking agent is selected from divinyl aromatics, alkyl acrylamides, diacrylates or dimethacrylates of polyols and mixtures thereof; more preferably, the amount of the multifunctional crosslinking agent is 10 to 30 wt% and the multifunctional crosslinking agent is selected from any one or a mixture of any several components of divinylbenzene, trivinylbenzene, divinyltoluene, divinylxylene, ethylene glycol dimethacrylate, 1, 4-butanediol dimethacrylate, 1, 6-hexanediol diacrylate, trimethylolpropane triacrylate, trimethylolpropane triisocrotonate, hexanediol dimethacrylate, 1, 12-dodecyl dimethacrylate, 1, 14-tetradecyl glycol dimethacrylate, etc.
The oil-soluble emulsifier in b) of the oil phase is preferably soluble in the oil phase and capable of forming a stable water-in-oil emulsion, and is selected from the group consisting of branched or straight chain glycerol esters of C16-C24 fatty acids, branched or straight chain sorbitan fatty acid esters of C16-C24 fatty acids, sucrose fatty acid esters, alkylphenol ethoxylates or mixtures of these components.
When the antibacterial porous structure surface membrane substrate needs to be prepared, in a preferred scheme, the oil phase a) may contain 0-3% by weight of hydrophobically modified nano zinc oxide particles, preferably, the particle size of the hydrophobically modified nano zinc oxide is 1-100nm, and the hydrophobically modified nano zinc oxide particles may be selected from long-chain fatty acid modified nano zinc oxide, organic silicon modified nano zinc oxide, surfactant modified nano zinc oxide, polyethylene glycol modified nano zinc oxide, various inorganic particle hybridized nano zinc oxide, or zinc oxide particles modified in any other way to change the surface hydrophilicity and hydrophobicity; preferably, the hydrophobic modified nano zinc oxide is selected from C9-C24 long-chain saturated or unsaturated fatty acid modified nano zinc oxide, organic silicon modified nano zinc oxide, silane coupling agent modified nano zinc oxide, titanate coupling agent modified nano zinc oxide, surfactant modified nano zinc oxide, polyethylene glycol modified nano zinc oxide or other modified zinc oxide particles which are modified in any mode so as to achieve the purpose of changing the surface hydrophilicity and hydrophobicity; more preferably, any one or more of lauric acid modified nano zinc oxide, stearic acid modified nano zinc oxide, silane coupling agent or titanate coupling agent modified nano zinc oxide, surfactant modified nano zinc oxide, chitosan modified nano zinc oxide, polyethylene glycol modified nano zinc oxide and titanate coupling agent modified nano zinc oxide is selected.
Specifically, the modification method of the hydrophobic modified nano zinc oxide comprises the steps of adding a certain mass of zinc oxide nano particles into an ethanol solution, adding a certain amount of C12-C22 long-chain fatty acid such as lauric acid, wherein the content of the fatty acid is more than 1%, continuously stirring for a proper time, performing centrifugal separation, and drying to obtain the hydrophobic surface fatty acid modified nano zinc oxide particles; for example, the preparation of the silane coupling agent modified nano zinc oxide can be realized by adding a certain mass of silane coupling agent into absolute ethyl alcohol, adjusting the pH value to about 5-6 by hydrochloric acid, adding nano zinc oxide at about 80 ℃, performing ultrasonic treatment, and finally performing centrifugal drying to obtain silane coupling agent modified nano zinc oxide particles; for example, the preparation of cationic surfactant modified zinc oxide particles, a certain amount of nano zinc oxide particles are stirred at a high speed for 2 hours in a hexadecyl trimethyl ammonium bromide solution with a certain concentration, and after centrifugation, the nano zinc oxide particles modified by hexadecyl trimethyl ammonium bromide are obtained by freeze drying; the preparation method is not limited to the examples in the invention, and any hydrophobic modified nano-zinc oxide obtained by the preparation method for achieving the purpose of hydrophobic modification is within the protection scope of the invention, and commercially available hydrophobic modified nano-zinc oxide can also be directly purchased.
In a preferred embodiment, the oil phase a) may further comprise the cellulose nanoparticles, preferably, the cellulose nanoparticles are selected from any one of cellulose nanocrystals, microcrystalline cellulose, cellulose nanofibers, nanocrystalline cellulose, nanocellulose, nanofibrillated cellulose or bacterial nanocellulose; the addition amount of the cellulose nano-particles can be 0-2%, preferably 0.5-2% of the total weight of the oil phase, and the addition of the cellulose nano-particles can improve the hydrophilicity and flexibility of the material.
Wherein the mixing emulsification temperature of the oil phase and the water phase of the water-in-oil emulsion prepared in the step 3) is 20-90 ℃, and a stable water-in-oil emulsion is formed at the mixing shearing speed of 50-5000 rpm.
The curing temperature of the water-in-oil emulsion in the step 4) is 45-120 ℃, the curing time is not higher than 0.5 hour, and the residual monomer content of the cured material is lower than 100ppm of the weight of the polymer.
The number average cell diameter of the porous structure material prepared in the step 4) is 1-100 μm, and preferably, the number average cell diameter of the porous structure material is 1-50 μm; porosity of not less than60%, preferably 70% to 90%; the thickness of the porous material after the porous material absorbs the mask essence and is saturated is not more than 1mm, and preferably 0.05-1 mm; the liquid carrying rate of the porous material to the facial mask essence with the viscosity ranging from 50cp to 2000cp is not less than 1000%, preferably 1000-3000%, and the liquid retention rate is not less than 80%, preferably 80-95%; the porous material has transverse and longitudinal bending rigidity of no more than 0.2gf cm after absorbing facial mask essence 2 Percm, preferably 0.001 to 0.2gf cm 2 /cm。
When the porous structure material is used as a mask base material, the safety of the porous structure material is equivalent to or superior to that of a traditional mask base material, wherein the traditional mask base material is non-woven fabric, silk, tencel, cuprammonium rayon, bamboo fiber, natural cotton, biological fiber, chitosan, composite fiber, hydrogel base material and the like.
The porous material can be compounded with wood pulp fibers, non-woven fibers or other viscose fibers and the like before or during the emulsion curing, or coated on a thermoplastic fiber net, so that the prepared mask base material has higher strength.
When the oil phase contains 0.05-3% of the hydrophobic modified nano zinc oxide particles, the antibacterial rate of the prepared porous material to staphylococcus aureus can reach more than 70% after 1 hour in an antibacterial test.
According to an optimal scheme, the preparation method of the porous structure mask with good air permeability, high liquid carrying rate, good fit with skin, wide adaptation of mask essence and antibacterial effect comprises the following specific preparation steps:
(1) forming a stable and uniform oil phase from the oil phase containing the hydrophobic modified nano zinc oxide, the polymeric monomer, the cross-linking agent and the emulsifier under the ultrasonic action at the temperature of 20-50 ℃;
(2) mixing an oil phase as a continuous phase with an aqueous phase containing an electrolyte as a dispersed phase at a temperature of from 40 ℃ to 90 ℃, preferably from 40 ℃ to 80 ℃, to form a stable HIPPE water-in-oil emulsion;
(3) curing the formed HIPEP emulsion for 30s-30 minutes in an oven or a water bath or under the condition of UV illumination;
(4) and washing, squeezing and dehydrating the cured porous material, and putting the porous material into the prepared mask essence to be absorbed to saturation.
In the step (1), the hydrophobically modified nano zinc oxide contained in the oil phase accounts for 0.05-3% of the total weight of the oil phase, such as but not limited to, 0.05%, 0.1%, 0.2%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0% of the modified zinc oxide contained in the oil phase, preferably, the hydrophobically modified nano zinc oxide accounts for 0.2-3% of the total weight of the oil phase, and more preferably, the hydrophobically modified nano zinc oxide accounts for 0.2-1% of the total weight of the oil phase; the hydrophobically modified nano zinc oxide is selected from fatty acid modified nano zinc oxide, organic silicon modified nano zinc oxide, surfactant modified nano zinc oxide, chitosan modified nano zinc oxide, polyethylene glycol modified nano zinc oxide, titanate coupling agent modified nano zinc oxide, various particle composite hybrid nano zinc oxide and the like, and is preferably selected from fatty acid modified nano zinc oxide, organic silicon modified nano zinc oxide and surfactant modified nano zinc oxide.
In step (1), the substantially water-insoluble monomer component is present in the oil phase in an amount of 80% to 99% by weight of the total weight of the oil phase, including, for example, but not limited to, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, preferably 90% to 95% by weight of the total weight of the oil phase.
Wherein the monomer component comprises: i) from 60 to 95 weight percent of at least one substantially water-insoluble monofunctional comonomer, based on the total weight of monomers contained in the oil phase; preferably, the monofunctional comonomer is selected from the group consisting of styrene, alkyl acrylates, alkyl methacrylates, aryl acrylates, and mixtures thereof; more preferably, from 70% to 90% by weight of a monomer component selected from: acrylic acid C 4 -C 18 Alkyl esters, methacrylic acid C 4 -C 18 Alkyl esters, styrene, alkylstyrene, and mixtures thereof. For example butyl acrylate, isooctyl acrylate, n-octyl acrylate, n-hexyl acrylate, nonyl acrylate, decyl acrylateEsters, isodecyl acrylate, dodecyl acrylate, tetradecyl acrylate, hexyl methacrylate, isooctyl methacrylate, decyl methacrylate, isodecyl methacrylate, dodecyl methacrylate, tetradecyl methacrylate, or octadecyl methacrylate; the monomer component may also contain water-insoluble comonomers such as vinyl chloride, isoprene or chloroprene.
ii) 5 to 40 weight percent, based on the total weight of monomers contained in the oil phase, of at least one substantially water-insoluble polyfunctional crosslinking agent; for example, including but not limited to 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% by total weight of the monomers of at least one substantially water insoluble multifunctional crosslinking agent selected from the group consisting of divinyl aromatics, diacrylates or dimethacrylates of polyols, and mixtures thereof; more preferably, 10 to 30 weight percent of a multifunctional crosslinking agent selected from any one of divinylbenzene, trivinylbenzene, divinyltoluene, divinylxylene, 1, 4-ethylene glycol dimethacrylate, 1, 6-hexanediol dimethacrylate, ethylene glycol dimethacrylate, hexanediol dimethacrylate, etc., or mixtures of these components, the crosslinking agent component being capable of providing the desired elasticity and strength to the material.
In step (1), the oil phase comprises 1% to 20% of emulsifier component soluble in the oil phase and capable of forming a stable water-in-oil emulsion, including, for example, but not limited to, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 16%, 17%, 18%, 19%, 20% of emulsifier component soluble in the oil phase and capable of forming a stable water-in-oil emulsion, based on the total weight of the oil phase, specifically, the oil-soluble emulsifier is selected from branched or linear C 16 -C 24 Fatty acid glycerides, branched or straight-chain C 16 -C 24 Fatty acid sorbitan fatty acidEsters, sucrose fatty acid esters, alkylphenol ethoxylates or mixtures of these components, for example sorbitan monooleate, sorbitan laurate, di (poly) glycerol stearate, di (poly) glycerol monooleate, polyglycerol succinate, sucrose stearate, etc.
In the step (1), the oil phase may further include various fibers, such as cellulose fibers, microcrystalline cellulose, cellulose nanofibers, cotton fibers, wood pulp fibers, various artificial fibers, viscose fibers, and the like, and experiments show that such fiber materials can improve the strength and flexibility of the porous structure material, and the material can have a very thin thickness and a high strength, so as to enhance the use strength of the thin-film substrate.
In the step (2), the mixing shear rate of the oil phase and the water phase is 50rpm to 5000rpm, such as but not limited to 50rpm, 100rpm, 300rpm, 500rpm, 700rpm, 900rpm, 1100rpm, 1300rpm, 1500rpm, 1700rpm, 1900rpm, 2000rpm, 3000rpm, 4000rpm, 5000rpm, and more preferably, the mixing shear rate is 200 rpm to 1500 rpm; the mass ratio of the water phase volume to the oil phase is 20 mL-40 mL: 1g, for example including but not limited to 10 mL: 1g, 15 mL: 1g, 20 mL: 1g, 25 mL: 1g, 30 mL: 1g, 35 mL: 1g, 40 mL: 1g of a compound; more preferably, the mass ratio of the volume of the aqueous phase to the mass of the oil phase is between 20 mL: 1 g-30 mL: 1g of the total weight of the composition.
In the step (2), the aqueous phase contains 0.5-15 wt% of water-soluble electrolyte, such as but not limited to 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15 wt% of water-soluble electrolyte, which is inorganic water-soluble salt selected from calcium chloride, magnesium chloride, or magnesium sulfate, calcium sulfate. The water-soluble electrolyte can reduce the solubility of the monomer and the cross-linking agent in water to the minimum, and the size and the number of material cells can be controlled by adjusting the adding amount of the electrolyte.
In the step (2), the aqueous phase contains 1% to 10% of water-soluble or oil-soluble initiator based on the total weight of the monomers, for example, including but not limited to 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10% of water-soluble or oil-soluble initiator based on the total weight of the monomers, wherein the initiator is selected from a photoinitiator or a thermal initiator or a redox-coupled initiator, and optionally the photoinitiator is selected from benzophenone, alpha-hydroxyalkylacetone (trade name 1173), benzyl ketal, alpha-aminoalkylphenone, acylphosphine oxide, and the like; or a thermal initiator such as persulfate or azobisisobutyronitrile hydrochloride, e.g., ammonium persulfate, sodium persulfate, potassium persulfate, azobisisobutyramidine dihydrochloride, azobisisobutyrimidazoline hydrochloride, or the like, and may also be selected from redox initiation systems such as at least any one of sodium persulfate, ammonium persulfate, potassium persulfate, azobisisobutyramidine dihydrochloride, azobisisobutyrimidazoline hydrochloride, or persulfate-sodium bisulfite, persulfate-ascorbic acid, persulfate-sodium thiosulfate, or the like; preferably, selected from photoinitiators, including: benzophenone, 1-hydroxycyclohexyl phenyl ketone (trade name 184), 2-methyl-2- (4-morpholinyl) -1- [4- (methylthio) phenyl ] -1-propanone, 2-isopropylthioxanthone, α -hydroxyalkylacetone (trade name 1173), benzyl ketal, α -aminoalkylphenones, acylphosphine oxides (e.g., TPO), and the like which can be dissolved in the oil phase; or may be 2-hydroxy-2-methyl-1- [4- (2-hydroxyethoxy) phenyl ] -1-propanone, 2-azobis [2- (2-imidazolin-2-yl) propane ] dihydrochloride or sulfate, thioxanthone derivatives (e.g., trade name TX), or the like, dissolved in an aqueous phase; in the present invention, it is preferable that the initiator is a persulfate type initiator.
In the step (3), the emulsified high internal phase emulsion prepared in the step (2) is coated in a polymethyl methacrylate or polyethylene or polypropylene or polytetrafluoroethylene container with the thickness of 0.05-1 mm, and then is cured in an oven or a water bath or a UV (ultraviolet) box, preferably at the curing temperature of 45-120 ℃, for 5-30 min, preferably 30 seconds-10 minutes, and after the curing is finished, the monomer conversion rate (calculated according to the mass percentage of unreacted residual monomers in the total monomers) in the oil phase is not lower than 85%.
In the step (3), the high internal phase emulsion prepared in the step (2) can also be directly coated on non-woven fabric fiber nets/cloths made of various materials, so that a porous structure material with improved strength and toughness can be obtained.
In the step (4), the solidified porous structure material is washed by deionized water, and then is extruded and dehydrated by a compression roller, the washing and extrusion and dehydration processes can be repeated for several times, for example, 1 time, 2 times, 3 times, 4 times, 5 times or more than 5 times, and the water content of the extruded and dehydrated porous structure material is not higher than 20% of the weight of the porous structure material.
In the step (4), the porous structure material after being washed, extruded and dehydrated for one or more times can be directly immersed into facial mask essence with the viscosity range of 50 cp-10000 cp to be absorbed to saturation, and the thickness of the facial mask after being absorbed to saturation is 0.05-1 mm.
The invention discloses a preparation method of a porous structure material used for a patch type facial mask base material and prepared from high internal phase emulsion and application of the porous structure material as the facial mask base material. When the High Internal Phase Pickering Emulsion (HIPPE) is prepared by adding the hydrophobic modified nano zinc oxide, the porous structure material obtained after the solidification has good antibacterial and bacteriostatic effects under the action of the modified zinc oxide, and the addition of the preservative can be avoided or greatly reduced, so that the irritation and sensitization to the skin are reduced, and the comprehensive advantages are more obvious compared with the traditional base material.
All the raw materials of the invention are not particularly specified and can be purchased from the market.
The properties of the porous material prepared in the present invention and the mask prepared therefrom were tested and characterized using the methods described below:
A) determination of the thickness of a Material
And measuring the material sample saturated with the facial mask liquid 1# by using a sponge material thickness measuring instrument, measuring for 3 times at different positions, and taking an average value.
B) Determination of number average cell diameter
The cell size of the porous material is measured by a Scanning Electron Microscope (SEM), the porous material is subjected to electron microscope test after being completely dried, at least more than 50 cell diameters are measured in a proper visual field range, and then the average value of the cell diameters is the number average cell diameter of the sample.
C) Determination of porosity
The porosity of a sample of porous material was tested using the following method:
measuring 3 samples with the length of 5cm x 5cm by using calipers after squeezing and dewatering (unabsorbed mask essence), obtaining the thickness of each sample by using the method A), weighing the weight of each sample, putting the sample into a closed container containing 2-propanol at room temperature, soaking for 0.5 hour, taking out, weighing when the sample does not drip liquid any more, and obtaining the porosity (the mass of the sample after absorbing 2-propanol-the mass of the sample before absorbing)/(the volume of the sample of 2-propanol) × 100%.
The porosity of non-woven fabrics, tencel or other fiber non-woven materials is tested by adopting a mass density method, namely, the real volume of the fiber is obtained by utilizing the ratio of the material surface density to the fiber density, and then the porosity is calculated as follows:
porosity 1-m/(ρ δ)
m is the areal density of the material, g/m 2 ；
Rho is fiber density, g/cm 3 ；
Delta is the material thickness, mm.
D) Measurement of liquid carrying rate
The liquid-carrying rate of the mask base material represents the liquid-holding capacity of the base material for absorbing the mask essence, if the mask liquid-holding capacity is low, the amount of the absorbed essence is small, the essence is remained in a packaging bag in a large number when the mask is used, the essence is easy to drip when being taken, and the utilization rate of the essence is low. Determination of liquid carrying Rate with reference to the GB/T24218.6-2010 test, each sample was cut to 10cm by 10cm size and the initial weight M of each sample was measured 0 Completely immersing it in the face mask essenceTaking out the Chinese liquor after 60 seconds, vertically hanging the Chinese liquor for 120 seconds, and then weighing M 1 . (M) liquid carrying rate 1 -M 0 )/M 0 100%, three times per sample, and the results averaged.
E) Measurement of liquid retention
The samples were cut into 6.5 x 6.5cm size samples and weighed M 0 Firstly, immersing a sample in the facial mask liquid for 2min, taking out the sample, vertically hanging the sample for 1min, and weighing M 1 Immediately placing into YG601H moisture permeameter of Ningbo Dahe apparatus Co Ltd at 37 deg.C and 65% RH, placing for 20min, taking out and weighing M 2 Each sample was tested in triplicate and the average was taken. Retention rate (M) 2 -M 0 )/(M 1 -M 0 )*100％。
F) Testing of air Permeability
Referring to the air permeability determination method in the standard GB/T24218.15-2018, a YG461 type full-automatic air permeability tester of the Laizhou electronic instrument factory is utilized to test the air permeability of a sample in the environment of 20 ℃ and 65% of humidity, the parameter of the test pressure difference is set to be 50Pa, and the test area is set to be 20cm 2 . And randomly selecting 5 positions for each sample, keeping the test part of the sample as flat as possible without pulling by force, and averaging the test results.
G) Determination of the bacteriostatic Rate
Referring to the antibacterial test of the test sample by the oscillation method provided in GBT 20944.3-2008, after oscillation contact for 18h, the bacteria inhibition rate is calculated by comparing the viable bacteria concentration in the control sample and the antibacterial fabric sample flask. The sample is cut into 5.0mm х 5.0.0 mm for testing, and staphylococcus aureus is selected as the test bacteria. The test is repeated for 3 times, the bacteriostasis rate is respectively calculated, and the average value is taken.
The bacteriostasis rate is (blank control recovered viable count-sample recovered viable count)/blank control recovered viable count is 100%.
H) Measurement of flexural rigidity
The transverse and longitudinal bending stiffness of the material absorbing the mask solution No. 1 (refer to Table 1) was tested by the skew method using a Japanese Kato Tech Co. model KES-FB2-A bending tester, referred to GB/T18318.1-2009, and the absorbing mask samples were cutThe test pieces cut into 200mm by 200mm are tested, and the test result is accurate to 0.01gf cm 2 In/cm, each sample was tested in each of the transverse and longitudinal directions three times, and the results were averaged.
I) Determination of the glass transition temperature Tg
The glass transition temperature characterizes the mechanical properties of the polymer, and the TG of the HIPE foam in the invention is tested by Thermal Mechanical Analysis (TMA), and a METTLER TMA/SDTA instrument (compression mode) is used for cutting a foam sample into cuboid sample pieces of 10mm multiplied by 5mm multiplied by 3mm, thereby ensuring that the upper surface and the lower surface are flat. The sample was placed on the support in the instrument, a quartz pad was placed on the upper surface of the sample, and the probe was lowered to begin the test.
The following embodiments are further described in the present invention, but not intended to limit the invention.
The facial mask essence adopted in the experiment comprises the following components:
TABLE 1 facial mask essence base formula
Example 1
A) Preparation of HIPEs
Stearic acid modified nano zinc oxide (purchased from Darcy concentrated nanotechnology Co., Ltd., 50nm, 0.1 g) and isooctyl acrylate (15.5 g), styrene (0.5 g), ethylene glycol dimethacrylate (4.0 g), benzophenone (0.7 g) and Cithrol DPHS (PEG-30 dipolyhydroxystearate, purchased from CRODA, 1.5 g) were mixed in an oil phase to obtain a homogeneous oil phase. Calcium chloride (7.6 g) was dissolved in 560 ml of deionized water to prepare an aqueous phase.
Placing the obtained oil phase in a polypropylene container with the volume of 1 liter, stirring the oil phase by using an IKA stirrer, wherein the stirring paddle is an anchor type stirring paddle made of polytetrafluoroethylene, the total length of the paddle is about 5cm, stirring the oil phase at the beginning by using the rotating speed of 100 revolutions per minute, simultaneously adding all the water phase within 5 minutes, preheating the water phase to 60 ℃ in advance, adding circulating water outside the dispersion container for heat preservation, and setting the temperature of the circulating water to be 60 ℃; with the addition of the water phase, the stirring speed is gradually increased, and the rotating speed is about 400 r/min after all the water phase is added, so that a stable and non-layered high internal phase emulsion is formed.
B) Curing of high internal phase emulsions
The prepared high internal phase emulsion was coated to a film thickness of 0.3 mm. And (5) after coating, putting the film into a UV box for illumination, and taking out after 30 s.
C) Washing and dewatering treatment
And washing the cured material with deionized water to remove residual emulsifier and inorganic salt, and then performing extrusion dehydration, wherein the washing and extrusion dehydration process can be repeated for several times according to actual conditions.
D) Preparation of facial mask
And cutting the dehydrated materials into the same size, and soaking and absorbing the materials in the mask liquid No. 1, No. 2 and No. 3 respectively until the materials are saturated.
Example 2
A) Preparation of high internal phase emulsions
Isooctyl acrylate (13.0 g), isooctyl methacrylate (4.0 g), 1, 4-butanediol dimethacrylate (3.0 g) and sucrose fatty acid ester S-370 (available from Mitsubishi chemical, 2.9 g) were mixed to give a homogeneous oil phase. Sodium chloride (12.2 g) was dissolved in 500 ml of deionized water to prepare an aqueous phase. 0.9 g of sodium persulfate was dissolved in 15ml of deionized water to obtain an initiator phase.
Placing the obtained oil phase in a polypropylene container with the volume of 1 liter, stirring the oil phase by using an IKA stirrer, wherein the stirring paddle is an anchor type stirring paddle made of polytetrafluoroethylene, the total length of the paddle is about 5cm, initially stirring the oil phase at the rotating speed of 200 revolutions per minute, simultaneously adding all the water phase within 5 minutes, preheating the water phase to 65 ℃ in advance, adding circulating water outside the dispersion container for heat preservation, and setting the temperature of the circulating water to be 55 ℃; the stirring speed is gradually increased along with the addition of the water phase, and the rotating speed is about 500 r/min after all the water phase is added, so that the stable and non-layered high internal phase emulsion is formed.
B) Curing of high internal phase emulsions
The prepared high internal phase emulsion was coated to a film thickness of 0.36 mm, and then placed in an oven at 100 ℃ for 20 minutes and then taken out.
The subsequent treatment process conditions and the preparation mode of the mask are completely consistent with those in example 1.
Example 3
A) Preparation of high internal phase Pickering emulsion
Lauric acid modified nano zinc oxide (purchased from Darcy concentrated nanotechnology Co., Ltd., 30nm, 0.08 g) and an oil phase of isodecyl acrylate (13.0 g), isooctyl methacrylate (1.0 g), divinylbenzene (6.0 g), glyceryl succinate (purchased from Chinese medicine, 1.7 g) and 1173(0.86 g) were mixed to obtain a uniform oil phase. Calcium chloride (18.1 g) was dissolved in 680 ml of deionized water to make an aqueous phase.
Placing the obtained oil phase in a polypropylene container with the volume of 1 liter, stirring the oil phase by using an IKA stirrer, wherein the stirring paddle is an anchor type stirring paddle made of polytetrafluoroethylene, the total length of the paddle is about 5cm, stirring the oil phase at the beginning by using the rotating speed of 180 revolutions per minute, simultaneously adding all the water phase within 5 minutes, preheating the water phase to 70 ℃ in advance, adding circulating water outside the dispersion container for heat preservation, and setting the temperature of the circulating water to 70 ℃; the stirring speed is gradually increased along with the addition of the water phase, the rotating speed is about 600 revolutions per minute after all the water phase is added, and after a stable and non-layered high internal phase emulsion is formed, the initiator solution is added and then stirred for 1 to 3 minutes.
B) Curing of high internal phase emulsions
The prepared high internal phase emulsion was coated to a film thickness of 0.5mm, and then placed in a UV box and taken out after 60 seconds of light irradiation.
The subsequent treatment process conditions and the preparation mode of the mask are completely consistent with those in example 1.
Example 4
A) Preparation of HIPEs
Silane coupling agent KH-570 modified nano zinc oxide (purchased from Rauwolfia new materials Co., Ltd., 30nm, 0.28 g) and ultrasonic are dispersed in an oil phase mixed with octadecyl methacrylate (13.0 g), trimethylolpropane triacrylate (7.0 g), Span 80(1.93 g) and benzophenone (0.89 g) to obtain a uniform oil phase. Calcium chloride (5.0 g) was dissolved in 650 ml of deionized water to prepare an aqueous phase.
Placing the obtained oil phase in a polypropylene container with the volume of 1 liter, stirring the oil phase by using an IKA stirrer, wherein the stirring paddle is an anchor type stirring paddle made of polytetrafluoroethylene, the total length of the paddle is about 5cm, stirring the oil phase at the beginning by using the rotating speed of 140 revolutions per minute, simultaneously adding all the water phase within 5 minutes, preheating the water phase to 60 ℃ in advance, adding circulating water outside the dispersion container for heat preservation, and setting the temperature of the circulating water to be 60 ℃; the stirring speed is gradually increased along with the addition of the water phase, the rotating speed is about 500 r/min after all the water phase is added, and after a stable and non-layered high internal phase emulsion is formed, the initiator solution is added and then stirred for 1-3 min.
B) Curing of high internal phase emulsions
The prepared high internal phase emulsion was coated to a thickness of 0.56 mm. And putting the curing mold into a UV box, and taking out after the curing mold is irradiated for 60 s.
The subsequent treatment process conditions and the preparation mode of the mask are completely consistent with those in example 1.
Example 5
A) Preparation of high internal phase Pickering emulsion
Microcrystalline cellulose (0.11 g from Kjeldahl, Shanghai) was dispersed in a mixture of isooctyl acrylate (12.5 g), isooctyl methacrylate (1.0 g), 1, 6-hexanediol dimethacrylate (6.5 g), triglycerol stearate (2.3 g, from a national drug), and benzophenone (0.9 g) to give a homogeneous oil phase. Calcium chloride (10.0 g) was dissolved in 550 ml of deionized water to prepare an aqueous phase.
Placing the obtained oil phase in a polypropylene container with the volume of 1 liter, stirring the oil phase by using an IKA stirrer, wherein the stirring paddle is an anchor type stirring paddle made of polytetrafluoroethylene, the total length of the paddle is about 5cm, stirring the oil phase at the beginning by using the rotating speed of 100 revolutions per minute, simultaneously adding all the water phase within 5 minutes, preheating the water phase to 76 ℃ in advance, adding circulating water outside the dispersion container for heat preservation, and setting the temperature of the circulating water to 76 ℃; the stirring speed is gradually increased along with the addition of the water phase, and the rotating speed is about 600 revolutions per minute after all the water phase is added, so that the stable and non-layered high internal phase emulsion is formed.
B) Curing of high internal phase emulsions
The prepared high internal phase emulsion was coated at a thickness of 0.65mm at 30g/m 2 The polypropylene non-woven fabric fiber net is put into a UV box and is taken out after being irradiated for 60 seconds.
The subsequent treatment process conditions and the preparation mode of the mask are completely consistent with those in example 1.
Example 6
A) Preparation of high internal phase Pickering emulsion
Microcrystalline cellulose (0.1 g) and stearic acid modified nano zinc oxide (0.2 g) are dispersed in a mixture of isooctyl acrylate (13.0 g), isooctyl methacrylate (4.0 g), 1, 4-butanediol dimethacrylate (3.0 g) and SPAN 80(2.9 g) to obtain a uniform oil phase. Calcium chloride (11.5 g) was dissolved in 680 ml of deionized water to make an aqueous phase. 0.9 g of sodium persulfate was dissolved in 10ml of water to obtain an initiation phase.
Placing the obtained oil phase in a polypropylene container with the volume of 1 liter, stirring the oil phase by using an IKA stirrer, wherein the stirring paddle is an anchor type stirring paddle made of polytetrafluoroethylene, the total length of the paddle is about 5cm, stirring the oil phase at the beginning by using the rotating speed of 100 revolutions per minute, simultaneously adding all the water phase within 5 minutes, preheating the water phase to 62 ℃ in advance, adding circulating water outside the dispersion container for heat preservation, and setting the temperature of the circulating water to 62 ℃; the stirring speed is gradually increased along with the addition of the water phase, the rotating speed is about 600 revolutions per minute after all the water phase is added, and the initiator solution is added and then stirred for 1 to 3 minutes to form the stable high internal phase emulsion without layering.
B) Curing of high internal phase emulsions
The prepared high internal phase emulsion was coated at a thickness of 0.5mm at 30g/m 2 The polypropylene non-woven fabric fiber net is put into a 90 ℃ oven for 30 minutes and then taken out.
The subsequent treatment process conditions and the preparation mode of the mask are completely consistent with those in example 1.
Comparative examples 1 to 6
Commercially available mask base fabrics such as spun-bonded non-woven fabrics, pure cotton fibers, silk fibers, hydrogel, tencel fibers and cuprammonium fibers are used as comparative examples 1-6, and are respectively cut into the same size and specification and then immersed into the mask solutions of No. 1, No. 2 and No. 3 to be soaked and absorbed until the mask base fabrics are saturated.
TABLE 2 absorbency of different facial mask essences
The results of the absorption performance of different mask base materials in mask solutions with different viscosities show that the porous structure material prepared from the high internal phase emulsion has very high absorption capacity and liquid retention capacity for different viscosities, particularly high viscosity mask solutions, and ensures the full utilization and wide blending range of the mask solutions; as can be seen from comparative examples 1 to 6, when the viscosity of the mask liquid is low, the viscosity of the conventional mask substrate is increased, and the liquid carrying rate and the liquid retention amount are increased, while when the viscosity of the mask liquid is high (from # 2 to # 3), the liquid carrying rate and the liquid retention amount are both decreased, because more mask liquid is adhered and absorbed by the fabric when the viscosity of the mask liquid is low, but when the viscosity of the mask liquid is high, the diffusion of the liquid into the interior of the fabric is influenced, and due to the unique microstructure that bubbles are connected and pores are communicated, the material with the porous structure has a good liquid carrying rate and liquid retention amount when the viscosity of the mask liquid is high by referring to the SEM image of the structure of fig. 1.
TABLE 3 other Properties
As can be seen from Table 3, the porous structure material has a plurality of window holes on each cell in the structure, and the highly porous structure enables the material to have good air permeability even when the number average cell diameter is not necessarily large, so that the porous structure material has higher porosity and better air permeability compared with mask base fabrics such as spun-bonded non-woven fabrics, pure cotton fibers, hydrogels and the like. The bending rigidity reflects the softness of the base cloth, the larger the bending rigidity is, the poorer the softness is, the poorer the skin attachment degree is in experience feeling, and the foaming is. When the porous material is obtained by curing the HIPEP emulsion prepared by the nano zinc oxide, the material has good antibacterial effect, and it can be seen that the materials still have good antibacterial effect when the mask liquid does not contain the antibacterial agent in the examples 1, 3 and 4, and the mask antibacterial effect of the masks of other examples and comparative examples which do not contain the nano zinc oxide is 0 when the mask liquid does not contain the antibacterial agent. In addition, in example 5, since the porous structure material was compounded on the nonwoven fabric web, the obtained mask base fabric had higher flexural rigidity, decreased softness, and improved strength.
The performances of the facial masks with different base materials are analyzed by combining the tables 2 and 3, and the fact that the porous structure material has high liquid carrying rate and liquid retention capacity for facial mask liquids with different viscosity ranges can be found, meanwhile, the porous structure material is good in fit degree with skin and good in air permeability, the purpose of achieving self-carried antibacterial effect can be achieved by adding the modified nano zinc oxide, and the comprehensive performance of the facial mask is better compared with that of a conventional facial mask base fabric in the market.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. It will be appreciated by those skilled in the art that modifications or adaptations to the invention may be made in light of the teachings of the present specification. Such modifications or adaptations are intended to be within the scope of the present invention as defined in the claims.
Claims (10)
1. The porous structure material for the surface mount type mask base material is characterized by being obtained by polymerizing a water-in-oil type high internal phase emulsion, the number average pore diameter of pores of the porous structure material is 1-100 mu m, the porosity is not lower than 60%, the thickness after wet saturation is not higher than 1mm, and the transverse and longitudinal bending rigidity of the porous structure material is not more than 0.2gf cm 2 /cm。
2. The porous structure material for the patch-type mask substrate according to claim 1, wherein the porous structure material has a number average cell size of 1 to 50 μm, a porosity of 70 to 90%, a thickness after wet saturation of 0.05 to 1mm, and a transverse and longitudinal bending rigidity of 0.001 to 0.2gf cm 2 /cm。
3. The porous structure material for the patch type mask substrate according to claim 1 or 2, wherein when the porous structure material is used as a mask substrate, a liquid carrying rate of mask liquid with different viscosities is not less than 1000%, and is preferably 1000-3000%.
4. The porous structure material for the patch type mask substrate according to any one of claims 1 to 3, wherein when the porous structure material is used as a mask substrate, a liquid retention rate of a mask liquid with different viscosities is not less than 80%, and preferably 80% to 95%.
5. A patch type mask, characterized by being made of a porous structure material for a patch type mask base material according to any one of claims 1 to 4.
6. The method for preparing the patch type mask according to claim 5, comprising the following steps:
1) preparing a water-in-oil emulsion comprising an oil phase which is dispersed under shear to form a homogeneous oil phase, the temperature of the oil phase being maintained at 20-90 ℃; wherein the oil phase comprises, based on the total weight of the oil phase:
a)80 to 99 weight percent of a substantially water-insoluble monomer component;
b) 1-20% by weight of an emulsifier component soluble in the oil phase and capable of forming a stable water-in-oil emulsion;
2) the water phase comprises 0.5 to 15 weight percent of water-soluble inorganic salt based on the total weight of the water phase, and the temperature of the water phase is maintained between 20 and 90 ℃; preferably, the oil phase also comprises water-soluble or oil-soluble initiator accounting for 1-10 percent of the total weight of the monomers based on the total weight of the monomers of the oil phase;
3) gradually adding the water phase into the oil phase under the shearing action to emulsify into a stable HIPEP emulsion; preferably at a shear rate of 50rpm to 5000 rpm;
4) curing the water-in-oil emulsion to form a porous structure material; preferably, the emulsified HIPEP emulsion is coated in a thickness of 0.05-1 mm, and then is cured in an oven or a water bath or a UV box, preferably at the curing temperature of 45-120 ℃ for 5 s-30 min;
5) and (3) washing, squeezing and dehydrating the cured porous material, and directly soaking the cured porous material into the prepared mask essence without drying until the porous material is saturated and absorbed to obtain the mask.
7. The preparation method according to claim 6, wherein the mass ratio of the water phase volume to the oil phase in the HIPE emulsion in the step 3) is not less than 20 mL: 1g, preferably 20mL to 40 mL: 1g of the total weight of the composition.
8. The preparation method according to claim 6, wherein the monomer component in the step 1) is selected from alkyl acrylate monomers or alkyl styrene monomers containing one or more carbon-carbon double bonds; preferably, the oil phase a) further comprises hydrophobic modified nano zinc oxide accounting for 0-3% of the total weight of the oil phase.
9. The preparation method of claim 6, wherein the oil phase a) further comprises cellulose nanoparticles, and the cellulose nanoparticles are added in an amount of 0-2% of the total weight of the oil phase; preferably, the cellulose nanoparticles are selected from any one of cellulose nanocrystals, microcrystalline cellulose, cellulose nanofibers, nanocrystalline cellulose, nanocellulose.
10. The method according to claim 6, wherein the glass transition temperature of the porous structure material after curing in step 5) after drying is in the range of-30 ℃ to 25 ℃.
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