CN111534926A - Preparation method of high-porosity mask - Google Patents
Preparation method of high-porosity mask Download PDFInfo
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- CN111534926A CN111534926A CN202010547201.9A CN202010547201A CN111534926A CN 111534926 A CN111534926 A CN 111534926A CN 202010547201 A CN202010547201 A CN 202010547201A CN 111534926 A CN111534926 A CN 111534926A
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/0212—Face masks
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
- D01F2/08—Composition of the spinning solution or the bath
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F4/00—Monocomponent artificial filaments or the like of proteins; Manufacture thereof
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/10—General cosmetic use
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Abstract
A preparation method of a high-porosity facial mask comprises milk protein cellulose preparation and composite spinning, and is characterized in that: the preparation of the milk protein cellulose sequentially comprises the steps of reduced pressure evaporation, degreasing, alkalization, separation and kneading; the decompression evaporation is to perform subsection decompression evaporation on pure milk, the temperature of the first stage is 45-60 ℃, the evaporation pressure is 22-30 kPa, the pure milk is concentrated until the water content is 65-75%, the temperature of the second stage is 35-50 ℃, the evaporation pressure is 12-20 kPa, and the pure milk is concentrated until the water content is 50-60%. Hair brushIn the method, the extraction rate of the milk protein fiber is improved from 70% to 90%, and the milk protein fiber has excellent mechanical properties. The modified mask base cloth prepared by the method has no phenomena of filament breakage and layering in the process of preparing the modified mask base cloth, has good uniformity, no agglomeration, reduced shrinkage rate after the base cloth is soaked in water and good dimensional stability, and the prepared base cloth has large aperture, high porosity and 70.2 percent of porosity, so that the mask basically has excellent air permeability and moisture absorption, the air permeability reaches 2960mm/s, and the water vapor permeability reaches 1580 g/(m) per second2·d)。
Description
Technical Field
The invention relates to a preparation method of a high-porosity composite mask base cloth.
Background
The mask is used as a skin care mask with multiple effects of moisturizing, whitening, cleaning pores and the like, is the first choice for skin care of consumers, and is used by covering the face to help the contained liquid components permeate the skin.
Currently, masks on the market are classified into 3 types, i.e., cream, paste, and sheet, according to their shapes. Among them, a sheet-like mask composed of essence and mask paper or mask base cloth is most common. The materials of the mask base cloth are very various, such as non-woven fabrics, biological fibers, gel and water-based adhesive tapes (also called cataplasm patch), wherein the non-woven fabrics are used by the most brands. From the facial mask base material that uses, more than 70% are the non-woven fabrics, and water thorn non-woven fabrics are given first place to, and the common use has tencel fibre, viscose fibre, cotton fiber, copper ammonia fibre, silk fibre etc. non-woven fabrics's characteristics are high-speed high yield, technology change many, can apply the fibre extensive, structural performance is diversified, accords with the facial mask operation requirement of "disposable, practical convenient, safety and sanitation, low cost". However, these base fabrics also have many problems. The viscose fiber prepared base cloth has the advantages of low manufacturing cost, good moisture absorption and better spinnability; but also has a plurality of defects when being used as a mask base cloth: the texture is heavy, the mechanical property is poor, the mechanical property is seriously reduced in a wet state, the elasticity is poor, the deformation is easy, the dimensional stability is poor, and the shrinkage rate is high; after being soaked in water, the mask base material becomes hard, so that the porosity of the mask base material is reduced, the air permeability of the mask base material in a wet state is reduced, the skin-friendly performance of the mask base material is poor, and the problem that the mask base material prepared from viscose cannot be avoided is solved. The milk protein is soft in water, high in water absorption rate, excellent in elasticity and light in texture, and is used for modifying viscose fibers to prepare the mask base cloth, so that the softness of the base cloth in water can be increased, the elasticity is improved, the skin-friendly performance of the base cloth is improved, and meanwhile, the milk protein contains a large amount of amino acids, so that the milk protein has excellent skin-friendly performance and has a skin care effect. However, when the milk protein fiber and the viscose fiber are blended, the problems of large shrinkage and unstable size still exist.
Disclosure of Invention
The invention aims to provide a preparation method of a high-porosity facial mask. The mask base cloth with high porosity is prepared from the milk protein cellulose modified viscose, so that the air permeability and the moisture absorption of the mask base cloth are improved.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a high-porosity modified mask base cloth comprises milk protein cellulose preparation and composite spinning, and is characterized in that: the preparation of the milk protein cellulose sequentially comprises the steps of reduced pressure evaporation, degreasing, alkalization, separation and kneading; the decompression evaporation is to perform subsection decompression evaporation on pure milk, the temperature of the first stage is 45-60 ℃, the evaporation pressure is 22-30 kPa, the pure milk is concentrated until the water content is 65-75%, the temperature of the second stage is 35-50 ℃, the evaporation pressure is 12-20 kPa, and the pure milk is concentrated until the water content is 50-60%.
In the process of reduced pressure evaporation, due to water evaporation, the concentration of protein is increased, the heating uniformity is reduced, a local overheating phenomenon is generated, partial protein is denatured, the extraction rate of milk protein cellulose is reduced, and the quality of the prepared milk protein fiber is poor. The invention adopts a sectional decompression mode, improves the vacuum degree, avoids protein denaturation, simultaneously ensures the evaporation efficiency and improves the extraction rate of milk protein cellulose.
In addition, the tensile strength and the breaking strength of the milk protein fibers are low, and the problems of yarn breakage, layering and the like are easily caused due to the tensile effect among the fibers during spinning.
Further, the degreasing is that the milk after decompression evaporation is subjected to centrifugal separation, then liquid is collected by hands, the centrifugal speed is 1000-5000 rpm, the time is 30-60 min, and the fat removal rate is controlled to be 90-95%; in the alkalization, 3-5% of sodium hydroxide aqueous solution is added into the centrifuged filtrate, the alkalization temperature is 40-60 ℃, and the fat residual rate after alkalization is less than 1%; the separation is to separate the protein in the alkalized emulsion by using a semipermeable membrane; the kneading is to add deionized water and protein adhesive into protein, and put into a kneading machine to heat to 60 ℃ for kneading to form fluid.
Further, the composite spinning is to mix viscose cellulose with water to prepare spinning solution A, to pretreat milk protein cellulose, to add nano carbon black to prepare spinning solution B, and to prepare the composite mask base fabric by adopting coaxial electrostatic spinning.
Further, in the coaxial spinning process, the electrode voltage is 40-90 KV, the spinning electrode spacing is 150-200 mm, the spinning humidity is 20-35%, the spinning temperature is 25-55 ℃, and the spinning speed ratio of the spinning solution A to the spinning solution B is 6-12: 1.
Further, the mass concentration of the spinning solution A is 2-20%.
Further, the spinning solution B is prepared by adding 3-10% of nano carbon black by mass ratio into pretreated milk protein cellulose, stirring for 6-8 hours at the speed of 700-1000 rpm, and the mass concentration of the spinning solution B is 5-22%, wherein the particle size of the nano carbon black is 20-50 nm.
The milk protein cellulose has serious static electricity and high mass specific resistance, and is easy to agglomerate, intertwine and knot during spinning, so that the milk protein fiber is not uniformly distributed, and the prepared mask base cloth has poor performance. The composite mask base fabric has a large amount of microporous nano carbon black, and the microporous nano carbon black is mixed with the milk protein cellulose, so that the mass specific resistance of the spinning solution is reduced, and the static conduction between the milk protein cellulose is improved, so that the static accumulation inside the milk protein cellulose is eliminated, the aggregation of the milk protein cellulose is prevented, and the milk protein cellulose is uniformly dispersed in the composite mask base fabric in the spinning process, so that the thickness of the base fabric is uniform. In addition, the porous structure of the carbon black enables the milk protein fiber to shrink at the pore opening of the surface of the milk protein fiber, and a certain pore is formed near the shrinking position, so that the porosity is increased. In addition, acting force is generated between the milk protein fiber molecular chain and the viscose cellulose respectively by the surface groups of the carbon black, and if the cellulose needs to deform in size shrinkage and the like, the acting force needs to be overcome, so that the deformation resistance of the cellulose is improved, the size stability of the cellulose is enhanced, and the mechanical property of the base cloth in a wet state is improved.
Further, the milk protein cellulose pretreatment is to filter and remove impurities from the prepared milk protein cellulose fluid, and then stir the filtrate for 5-8 hours at the temperature of 30-50 ℃ and the rotating speed of 700-1500 rpm, so that broken filaments and broken ends in the subsequent spinning process are reduced, and the spinning toughness is improved.
Most specifically, the preparation method of the high-porosity modified mask base cloth is characterized by comprising the following steps:
step 1, preparing milk protein cellulose
Carrying out sectional reduced pressure evaporation on the pure milk, wherein the temperature of the first stage is 45-60 ℃, the evaporation pressure is 22-30 kPa, the pure milk is concentrated until the water content is 65-75%, the temperature of the second stage is 35-50 ℃, the evaporation pressure is 12-20 kPa, and the pure milk is concentrated until the water content is 50-60%; carrying out centrifugal separation on the milk subjected to reduced pressure evaporation, and then collecting filtrate, wherein the centrifugal rotation speed is 1000-5000 rpm, and the time is 30-60 min; adding 3-5% sodium hydroxide aqueous solution into the centrifuged filtrate, wherein the alkalization temperature is 40-60 ℃; separating the protein from the alkalized emulsion by using a semipermeable membrane; adding deionized water and protein adhesive into protein, placing into a kneading machine, heating to 60 deg.C, and kneading to form fluid;
step 2, preparing composite mask base cloth
2.1, dissolving viscose cellulose in water to prepare spinning solution A with the mass concentration of 2-20%;
2.2, filtering the milk protein cellulose fluid prepared in the step 1, stirring the filtrate at the temperature of 30-50 ℃ for 5-8 h at the rotating speed of 700-1500 rpm, adding 3-10% of nano carbon black in mass proportion, and stirring at the speed of 700-1000 rpm for 6-8 h to form a spinning solution B with the mass concentration of 5-22%, wherein the particle size of the nano carbon black is 20-50 nm;
2.3, co-axial electrostatic spinning and blending are adopted for the spinning solution A and the spinning solution B, the voltage of spinning electrodes is 40-90 KV, the distance between the spinning electrodes is 150-200 mm, the spinning humidity is 20-35%, the spinning temperature is 25-55 ℃, and the spinning speed ratio of the spinning solution A to the spinning solution B is 6-12: 1, so that the composite mask base fabric is prepared.
The invention adopts the mixture of the milk protein fiber and the viscose cellulose, when the spinning solution A and the spinning solution B are used for coaxial different-speed spinning, the milk protein fiber is stretched in the forming process due to different spinning speeds, so that certain pores are formed in the base fabric. In addition, the milk protein cellulose and the viscose cellulose are blended, so that mutual repulsion between molecular chain segments of the cellulose is increased, a certain distance is kept between fibers in the blending process, a certain pore structure is formed, the porosity of the composite mask base cloth is further improved, the compactness of the base cloth is reduced, and the air permeability and the moisture absorption of the base cloth are improved.
The invention has the following technical effects:
in the method, the extraction rate of the milk protein fiber is improved from 70% to 90%, and the milk protein fiber has excellent mechanical properties. The method has the advantages that the phenomena of filament breakage and layering are avoided in the process of preparing the modified mask base cloth; the prepared base cloth has good uniformity and no agglomeration; meanwhile, the shrinkage rate of the base fabric after soaking in water is reduced, and the dimensional stability is good; the base cloth has large aperture, high porosity and 70.2 percent of porosity, so that the mask basically has excellent air permeability and moisture absorption, the air permeability reaches 2960mm/s, and the water vapor permeability reaches 1580 g/(m)2·d)。
Drawings
FIG. 1: the pore size distribution proportion diagram of the milk protein fiber modified base cloth and the non-modified base cloth prepared by the invention.
FIG. 2: the porosity of the milk protein fiber modified base cloth prepared by the invention is compared with that of the non-modified base cloth.
FIG. 3: the air permeability of the milk protein fiber modified base cloth prepared by the invention is compared with that of the non-modified base cloth.
FIG. 4: the comparison graph of the moisture permeability of the milk protein fiber modified base cloth and the non-modified base cloth prepared by the invention.
Detailed Description
The present invention is described in detail below by way of examples, it should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and adaptations of the present invention based on the above-mentioned disclosure.
Example 1
A preparation method of a high-porosity modified mask base cloth comprises the following steps:
step 1, preparing milk protein cellulose
Carrying out sectional reduced pressure evaporation on pure milk, wherein the temperature of the first stage is 55 ℃, the evaporation pressure is 25kPa, the pure milk is concentrated until the water content is 70 percent, the temperature of the second stage is 40 ℃, the evaporation pressure is 15kPa, and the pure milk is concentrated until the water content is 55 percent;
carrying out centrifugal separation on the milk subjected to reduced pressure evaporation, and then collecting filtrate, wherein the centrifugal rotation speed is 4000rpm, and the time is 40 min; adding a sodium hydroxide aqueous solution with the mass concentration of 4% into the centrifuged filtrate, and alkalifying at 50 ℃; separating the protein from the alkalized emulsion by using a semipermeable membrane; adding deionized water and protein adhesive into protein, placing into a kneading machine, heating to 60 deg.C, and kneading;
step 2, preparing composite mask base cloth
2.1, dissolving viscose cellulose in water to prepare spinning solution A with the mass concentration of 10%;
2.2, filtering the milk protein cellulose prepared in the step 1, stirring the filtrate at 45 ℃ for 6h at the rotating speed of 1000rpm, adding 5% of nano carbon black in mass proportion, and stirring at the speed of 800rpm for 7h to form a spinning solution B with the mass concentration of 15%, wherein the particle size of the nano carbon black is 20-50 nm;
and 2.3, adopting coaxial electrostatic spinning and blending to spin the spinning solution A and the spinning solution B, wherein the voltage of spinning electrodes is 60KV, the distance between the spinning electrodes is 180mm, the spinning humidity is 30%, the spinning temperature is 45 ℃, and the spinning speed ratio of the spinning solution A to the spinning solution B is 8:1, so as to prepare the composite mask base fabric.
The embodiment has no phenomena of yarn breaking and layering in the spinning process, and the prepared mask base cloth has no agglomeration phenomenon and good uniformity.
Example 2
A preparation method of a high-porosity modified mask base cloth comprises the following steps:
step 1, preparing milk protein cellulose
Carrying out sectional reduced pressure evaporation on pure milk, wherein the temperature of the first stage is 60 ℃, the evaporation pressure is 30kPa, and the pure milk is concentrated until the water content is 65%, the temperature of the second stage is 50 ℃, the evaporation pressure is 20kPa, and the pure milk is concentrated until the water content is 50%;
carrying out centrifugal separation on the milk subjected to reduced pressure evaporation, and then collecting filtrate, wherein the centrifugal rotation speed is 1000rpm, and the time is 60 min; adding a sodium hydroxide aqueous solution with the mass concentration of 5% into the centrifuged filtrate, and alkalifying at 40 ℃; separating protein from the alkalized emulsion with semipermeable membrane, adding deionized water and protein adhesive into protein, placing into a kneading machine, heating to 60 deg.C, and kneading;
step 2, preparing composite mask base cloth
2.1, dissolving viscose cellulose in water to prepare spinning solution A with the mass concentration of 2%;
2.2, filtering the milk protein cellulose prepared in the step 1, stirring the filtrate at 50 ℃ for 8h at the rotating speed of 700rpm, adding 3% of nano carbon black in mass proportion, and stirring at the speed of 700rpm for 6h to form a spinning solution B with the mass concentration of 5%, wherein the particle size of the nano carbon black is 20-50 nm;
and 2.3, adopting coaxial electrostatic spinning and blending to spin the spinning solution A and the spinning solution B, wherein the voltage of spinning electrodes is 40KV, the distance between the spinning electrodes is 150mm, the spinning temperature is 55 ℃ with the spinning humidity of 20%, and the spinning speed ratio of the spinning solution A to the spinning solution B is 6:1, and preparing the composite mask base fabric.
The embodiment has no phenomena of yarn breaking and layering in the spinning process, and the prepared mask base cloth has no agglomeration phenomenon and good uniformity.
Example 3
A preparation method of a high-porosity modified mask base cloth comprises the following steps:
step 1, preparing milk protein cellulose
Carrying out sectional reduced pressure evaporation on pure milk, wherein the temperature of the first stage is 45 ℃, the evaporation pressure is 22kPa, the pure milk is concentrated until the water content is 75 percent, the temperature of the second stage is 35 ℃, the evaporation pressure is 12kPa, and the pure milk is concentrated until the water content is 60 percent;
centrifuging the milk after decompression and evaporation, and then collecting filtrate, wherein the centrifugal speed is 5000rpm, and the time is 30 min; adding 3% sodium hydroxide aqueous solution into the centrifuged filtrate, and alkalifying at 60 deg.C; separating protein from the alkalized emulsion with semipermeable membrane, adding deionized water and protein adhesive into protein, placing into a kneading machine, heating to 60 deg.C, and kneading;
step 2, preparing composite mask base cloth
2.1, dissolving viscose cellulose in water to prepare spinning solution A with the mass concentration of 20%;
2.2, filtering the milk protein cellulose prepared in the step 1, stirring the filtrate at 30 ℃ for 5h at the rotating speed of 1500rpm, adding 10% of nano carbon black in mass proportion, and stirring at the speed of 1000rpm for 8h to form a spinning solution B with the mass concentration of 22%, wherein the particle size of the nano carbon black is 20-50 nm;
and 2.3, adopting coaxial electrostatic spinning and blending to spin the spinning solution A and the spinning solution B, wherein the voltage of spinning electrodes is 40KV, the distance between the spinning electrodes is 200mm, the spinning humidity is 35%, the spinning temperature is 25 ℃, and the spinning speed ratio of the spinning solution A to the spinning solution B is 12:1, so as to prepare the composite mask base fabric.
The embodiment has no phenomena of yarn breaking and layering in the spinning process, and the prepared mask base cloth has no agglomeration phenomenon and good uniformity.
Comparative example
The comparative example adopts milk protein fiber to directly blend and prepare base cloth with viscose cellulose:
dissolving viscose cellulose in water to prepare spinning solution A with the mass concentration of 15%; preparing a spinning solution B with the mass concentration of 12% by adopting milk protein cellulose extracted by once reduced pressure evaporation and water, and blending by adopting electrostatic spinning, wherein the voltage of a spinning electrode is 60KV, the distance between spinning electrodes is 180mm, the spinning humidity is 30%, the spinning temperature is 45 ℃, and the spinning speed ratio of the spinning solution A to the spinning solution B is 8:1 to prepare the mask base fabric.
In the preparation process, spinning fracture and delamination occur, and the prepared base fabric is uneven in thickness.
The pore diameter ratio data of the modified mask base cloth prepared by the invention and the base cloth prepared by the comparative example are shown in table 1.
Table 1: different aperture ratio data of two base fabrics
| Range of pore diameters | Less than 10 μm | 10-20μm | 20-30μm | 30-40μm | 40-50μm | 50-60μm | 60 μm or more |
| Comparative example | 21.20％ | 20.30％ | 13.50％ | 15.70％ | 11.90％ | 7.90％ | 9.50％ |
| The invention | 14.40％ | 15.20％ | 13％ | 17.80％ | 22.20％ | 13.30％ | 4.10％ |
Therefore, in the pore size distribution of the modified base fabric prepared by the invention, the large-size pore occupation ratio is high, the large pore structure is adopted, and the air permeability is enhanced. The pore size distribution of 60 μm or more in the comparative example was increased, mainly due to the occurrence of filament breakage during spinning, resulting in larger pore sizes.
Compared with the base fabric prepared by the comparative example, the shrinkage of the base fabric prepared by the invention after soaking is reduced by 56.4%, and the base fabric has excellent dimensional stability.
The performance of the modified mask base cloth prepared by the invention is analyzed:
1. pore size structure and porosity
The surface morphology of the sample is analyzed by using a scanning electron microscope, the porosity of the modified mask base cloth is obviously larger than that of the base cloth prepared by a proportion, namely, the porosity of the base cloth is greatly improved by combining modification with a specific spinning means. The permeability of the non-woven material is characterized by porosity, and the calculation formula is
P＝[1-m/(ρ)]×100％；
Wherein p is porosity,%; rho is the fiber density, g/m3(ii) a Is the material thickness, m; m is the mass of the material in square meters,g/m2。
according to the formula, the porosity of the milk protein cellulose modified base fabric is calculated to be 72.4%, and the porosity of the base fabric prepared by the comparative example is 49.1%, as shown in figure 2. The milk protein fiber modified base fabric prepared by the invention has high porosity, thereby ensuring excellent air permeability and moisture absorption.
FIG. 1 shows the ratio of different pore sizes of two materials. The data show that compared with the pore size distribution of a non-modified base fabric, the pore size distribution of the mask base fabric prepared by the milk protein modified cellulose is high in large-size pore occupancy ratio and high in porosity of 72.4%.
2. Air permeability detection
Referring to GB/T5453-1997 Standard of determination of air permeability of textile fabrics, the air permeability of the dry mask base cloth is measured by a YG461E full-automatic fabric air permeability instrument. As can be seen from FIG. 3, the air permeability of the milk protein cellulose modified base fabric was 2980mm/s, which is about 54.9% higher than that of the non-modified base fabric.
3. Moisture permeability detection
According to the standard of GB/T12704.1-2009 part 1 of textile fabric moisture permeability test method: wet absorption method, a positive cup method is adopted, and the moisture permeability (WVT) of the dry facial mask base cloth is calculated. As can be seen from FIG. 4, the moisture permeability of the milk protein cellulose modified base fabric was 1580 g/(m)2D) compared with non-modified base fabric (730 g/(m)2D)) increased by about 67.2%, from which it can be seen that the milk protein fiber-modified base fabric prepared according to the present invention is excellent in moisture absorption performance.
Claims (7)
1. A preparation method of a high-porosity mask base cloth comprises milk protein cellulose preparation and composite spinning, and is characterized in that: the preparation of the milk protein cellulose sequentially comprises the steps of reduced pressure evaporation, degreasing, alkalization, separation and kneading; the decompression evaporation is to perform subsection decompression evaporation on pure milk, the temperature of the first stage is 45-60 ℃, the evaporation pressure is 22-30 kPa, the pure milk is concentrated until the water content is 65-75%, the temperature of the second stage is 35-50 ℃, the evaporation pressure is 12-20 kPa, and the pure milk is concentrated until the water content is 50-60%.
2. The method for preparing the high-porosity modified mask base cloth according to claim 1, wherein the method comprises the following steps: the degreasing is that the milk after decompression evaporation is subjected to centrifugal separation, then liquid is collected by hands, the centrifugal speed is 1000-5000 rpm, the time is 30-60 min, and the fat removal rate is controlled to be 90-95%; in the alkalization, 3-5% of sodium hydroxide aqueous solution is added into the centrifuged filtrate, the alkalization temperature is 40-60 ℃, and the fat residual rate after alkalization is less than 1%; the separation is to separate the protein in the alkalized emulsion by using a semipermeable membrane; the kneading is to add deionized water and protein adhesive into protein, and put into a kneading machine to heat to 60 ℃ for kneading to form fluid.
3. The method for preparing the high-porosity modified mask base cloth according to claim 1, wherein the method comprises the following steps: the composite spinning is to mix viscose cellulose with water to prepare spinning solution A, to pretreat milk protein cellulose, to add nano carbon black to prepare spinning solution B, and to prepare the composite mask base cloth by coaxial electrostatic spinning.
4. The method for preparing the high-porosity modified mask base cloth according to claim 3, wherein the method comprises the following steps: in the coaxial electrostatic spinning process, the electrode voltage is 40-90 KV, the spinning electrode spacing is 150-200 mm, the spinning humidity is 20-35%, the spinning temperature is 25-55 ℃, and the spinning speed ratio of the spinning solution A to the spinning solution B is 6-12: 1.
5. The method for preparing the high-porosity modified mask base cloth according to claim 3 or 4, wherein the method comprises the following steps: the mass concentration of the spinning solution A is 2-20%.
6. The method for preparing the high-porosity modified mask base cloth according to any one of claims 3 to 5, wherein the method comprises the following steps: the spinning solution B is prepared by adding 3-10% of nano carbon black in mass proportion into pretreated milk protein cellulose, and stirring at the speed of 700-1000 rpm for 6-8 hours, wherein the mass concentration of the spinning solution B is 5-22%, and the particle size of the nano carbon black is 20-50 nm.
7. A preparation method of a high-porosity modified mask base cloth is characterized by comprising the following steps:
step 1, preparing milk protein cellulose
Carrying out sectional reduced pressure evaporation on the pure milk, wherein the temperature of the first stage is 45-60 ℃, the evaporation pressure is 22-30 kPa, the pure milk is concentrated until the water content is 65-75%, the temperature of the second stage is 35-50 ℃, the evaporation pressure is 12-20 kPa, and the pure milk is concentrated until the water content is 50-60%; carrying out centrifugal separation on the milk subjected to reduced pressure evaporation, and then collecting filtrate, wherein the centrifugal rotation speed is 1000-5000 rpm, and the time is 30-60 min; adding 3-5% sodium hydroxide aqueous solution into the centrifuged filtrate, wherein the alkalization temperature is 40-60 ℃; separating the protein from the alkalized emulsion by using a semipermeable membrane; adding deionized water and protein adhesive into protein, placing into a kneading machine, heating to 60 deg.C, and kneading to form fluid;
step 2, preparing composite mask base cloth
2.1, dissolving viscose cellulose in water to prepare spinning solution A with the mass concentration of 2-20%;
2.2, filtering the milk protein cellulose fluid prepared in the step 1, stirring the filtrate at the temperature of 30-50 ℃ for 5-8 h at the rotating speed of 700-1500 rpm, adding 3-10% of nano carbon black in mass proportion, and stirring at the speed of 700-1000 rpm for 6-8 h to form a spinning solution B with the mass concentration of 5-22%, wherein the particle size of the nano carbon black is 20-50 nm;
2.3, co-axial electrostatic spinning and blending are adopted for the spinning solution A and the spinning solution B, the voltage of spinning electrodes is 40-90 KV, the distance between the spinning electrodes is 150-200 mm, the spinning humidity is 20-35%, the spinning temperature is 25-55 ℃, and the spinning speed ratio of the spinning solution A to the spinning solution B is 6-12: 1, so that the composite mask base fabric is prepared.
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