Preparation method and application of skin-friendly permeation-promoting fiber membrane cloth

Abstract

The invention discloses a preparation method and application of skin-friendly fiber membrane cloth with a bionic knuckle interlocking structure. The preparation method comprises the following steps: 1) mixing dry cellulose pulp and a 20% NMMO aqueous solution according to a solid-to-liquid ratio of 1: 8, and carrying out primary swelling for 20 minutes under negative pressure of-0.08 MPa; raising the temperature, and keeping negative pressure for secondary swelling for 20 minutes; continuously raising the temperature to form a uniform spinning solution; inducing to form periodic knuckle structure fibers; after secondary countercurrent washing and cross-linking treatment, drying and shaping with hot air at 110 DEG C; 2) mixing the knuckle fibers prepared in the step 1) with conventional lyocell fibers according to a mass ratio of (1-3): 10; after lapping, adopting a three-stage spunlace process, and drying to obtain the skin-friendly fiber membrane cloth. According to the skin-friendly fiber membrane cloth with the bionic knuckle interlocking structure, the problem that a facial mask cannot be adaptively attached to a high-curvature area of the face is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to a fiber film cloth, in particular to a preparation method and application of a skin-friendly and penetration-promoting fiber film cloth with a bionic knuckle interlocking structure. BACKGROUND

[0002] Lyocell fiber is a green natural regenerated cellulose fiber, and its production process is environmentally friendly and has excellent moisture absorption and air permeability, so it is widely used in base material fields such as facial masks and medical dressings. Although the lyocell fiber film cloth has a higher moisture absorption rate compared with traditional non-woven fabrics, there are still defects in dynamic fitting in high-curvature areas of the face (such as the nose wings, eye corners, brow bones, and eye sockets).

[0003] In the high-curvature area of the face, the film cloth has limited extensibility, the contact area of the face is reduced, and the local water loss rate is accelerated. After the product is used for 5 minutes or more, the film cloth loses part of the liquid load in the high-curvature area of the face first, the rigidity of the film cloth is increased, and the film cloth cannot follow the dynamic loss of water and cause micro-strain, resulting in a decrease in local lifting and fitting degree, and a decrease in penetration-promoting effect.

[0004] Lyocell fiber is the fiber with the highest crystallinity, and the orientation of the molecular chain affects the elastic modulus of the fiber. The higher the orientation, the higher the mechanical strength of the fiber, and the higher the elastic modulus. The cellulose molecular chain of lyocell fiber contains a large number of hydroxyl groups, which form a hydration layer when adsorbing water molecules. The migration of facial mask essence on the film cloth is mainly controlled by capillary action.

[0005] According to the Laplace equation The smaller the radius of curvature, the greater the additional pressure. When the film cloth is in a high-curvature part, the additional pressure increases, resulting in a significant increase in capillary pressure and accelerated loss of liquid load of the film cloth. Water molecules are a natural fiber plasticizer that can reduce the elastic modulus of the film cloth, so when the essence is lost, the elastic modulus of the film cloth increases, and the fitting degree of the film cloth changes dynamically. As the time of applying the facial mask increases, the fitting degree of the film cloth decreases dynamically, and the film cloth changes from fitting to non-fitting. When the fitting degree decreases, the contact area of the film cloth with the face skin decreases, and the penetration efficiency of the film cloth for the essence also decreases.

[0006] The entanglement depth of the conventional spunlace nonwoven fabric is affected by the fiber length characteristics. When the fiber length is less than 38 mm, the fiber free bending degree is insufficient, resulting in a decrease in the entanglement point. This is because the single fiber of lyocell fiber is in a cylindrical shape, the surface is smooth and uniform in shape, the contact area between the fibers is very small, and the combination ability between the fibers is insufficient, so that sliding easily occurs during the spunlace process, and the entanglement degree of the entanglement point is insufficient. Under the spunlace process, the speed of the high-pressure spunlace needle will be quickly reduced when penetrating the fiber web, and the entanglement degree of the lower layer of the fiber will be reduced. At this time, the spunlace pressure needs to be increased, but the increase of the spunlace pressure will cause the rigidity of the film cloth to increase obviously, the elastic modulus increases, and as a liquid substrate for face film, the ductility decreases, the fit degree of the high curvature part of the face decreases, and the soft feeling of the use experience decreases. In addition, the spunlace pressure is too large, which will break the fiber web and cause the film cloth to "leak bottom".

[0007] The existing biomimetic fiber technology mainly simulates the structure of natural fibers, and artificially synthesizes fiber materials. By simulating the components or micro-morphological characteristics of natural fibers, special functions are realized, such as biomimetic spider silk to realize high toughness and strength, and biomimetic plant fiber to realize directional transport. However, this single fiber biomimetic preparation process has complex microstructure, high biomimetic precision requirement, high processing difficulty, low commercialization mass production feasibility, and limited practical application. Moreover, the biomimetic technology is more used to increase the strength of the fiber, and cannot meet the demand for improving the soft experience and fit of the film cloth. SUMMARY

[0008] In view of the deficiencies of the prior art, the purpose of the present application is to provide a preparation method of a skin-friendly fiber penetration-promoting film cloth with a biomimetic knuckle interlocking structure, which solves the problem of the decline of the penetration-promoting effect caused by the inability of the face mask to self-adaptively fit in the high-curvature area of the face.

[0009] Another purpose of the present application is to provide an application of the skin-friendly fiber penetration-promoting film cloth with the biomimetic knuckle interlocking structure.

[0010] The purpose of the present application and the solution to the technical problem are realized by adopting the following technical scheme. According to the preparation method of the skin-friendly fiber penetration-promoting film cloth with the biomimetic knuckle interlocking structure, the following steps are included:

[0011] 1) Preparation of biomimetic knuckle fiber:

[0012] Mix the dry cellulose pulp with 20% NMMO aqueous solution at a solid-liquid ratio of 1:8, and perform one-time swelling under a negative pressure of-0.08 MPa for 20 minutes;

[0013] Increase the temperature to 80℃ to concentrate the NMMO solution to 78%, and maintain the negative pressure for secondary swelling for 20 minutes;

[0014] Continue to warm up to 105℃ vacuum dehydration to make NMMO concentration of 87%, forming a uniform spinning solution;

[0015] The spinning plate is used for spinning, the air gap height is 18mm, the coagulation bath is 10% NMMO aqueous solution at 25℃, the initial shear rate is 400s -1 and gradually increase to 2400s -1 , the lifting speed is 5-10 per second, and the periodic knuckle structure fiber is induced to form;

[0016] The speed ratio of the traction roller is 1:3.5, and the fiber with a linear density of 0.9-1.3dtex is prepared, which is washed by two-stage countercurrent washing, crosslinking treatment, and then dried and shaped by hot air at 110℃;

[0017] 2) Preparation of interlocking structure non-woven fabric:

[0018] The knuckle fiber prepared in step 1) is mixed with conventional lyocell fiber in a mass ratio of (1-3):10;

[0019] After laying, a three-stage water jet process is used: the first way is 30°-50° and 110°-150°, the pressure is 30-80bar, the second way is 120° water jet 100-120bar, and the third way is 90° water jet 120-180bar;

[0020] After drying, the skin-friendly fiber membrane cloth is prepared.

[0021] Further, in the preparation process of the biomimetic knuckle fiber of step 1), first, the raw pulp is treated, the dry pulp is mixed with NMMO (N-methyl morpholine-N-oxide) solution at a certain solid-liquid ratio, and the first wet swelling is completed under negative pressure. Increase, warm up to NMMO gradually concentrated to 78%, maintain the second negative pressure for 20min, with the passage of time and the increase of NMMO concentration, the fiber from uniform swelling state through "spherical" swelling, further broken into smaller fiber dissolution, continue to heat the pulp to completely dissolve into concentrated fiber spinning solution;

[0022] After the spinning solution enters the spinning equipment, the air gap height and the micro-pore shear rate are adjusted, so that the axial length of the liquid layer deformation region is close to the air gap height. By setting the initial shear rate and controlling the lifting speed, the shear rate is slowly increased until the periodic knuckle shape appears in the spinning coagulation bath, and the solidified and shaped spinning is taken into the traction shaft; drawn into two-stage water washing by traction roller shaft;

[0023] After removing the excess solvent, it enters the crosslinking liquid, anti-fibrillation, drying and shaping to form a stable knuckle structure.

[0024] Further, in the preparation process of the interlocking structure non-woven fabric of step 2), the water jet stage is entered, first through the first water jet, divided into upper and lower two, the water jet angle is controlled to be 30-50° and 110-150° respectively, the pressure is 30-80 bar, the upper water jet head is used to wet the fiber compaction and surface entanglement, the knuckle fiber is preliminarily infiltrated to complete the preliminary entanglement, and the lower water jet head is used for fiber cross entanglement and knuckle fiber cross entanglement with conventional fibers;

[0025] The roller shaft is pulled into the second water jet, the water jet angle is 100-120°, the water jet pressure is 100-120 bar, the water jet pressure is increased to perform deep entanglement, at this time, the knuckle fiber is infiltrated and expanded to form a curvature, and the "S" structure is interwoven with conventional fibers to form fiber interlocking;

[0026] Finally, the third 90° vertical water jet is performed, and the structure interlocking is fixed by 120-180 bar water jet pressure; and then the fabric can be put into a drying device, and after high-temperature drying, the fabric is finished.

[0027] Further, the knuckle fiber has a knuckle diameter of 10-15 μm, a thin knuckle diameter of 8-11 μm, a diameter ratio of (1.1-3):1, and a bamboo joint spacing of 1-35 mm.

[0028] Further, the spinneret hole diameter is 0.12 mm, the hole number is 200 holes, and the length-diameter ratio L / D is 5.

[0029] Further, the cross-linking treatment adopts an epoxy cross-linking agent, and the treatment time is 30 minutes.

[0030] Further, the linear density of the conventional lyocell fiber is 1.3 dtex.

[0031] Further, the skin-friendly fiber membrane fabric prepared by the above method is obtained, and the bionic knuckle fiber in the membrane fabric is fixed in the conventional fiber network by the water jet process to form a three-dimensional interlocking structure.

[0032] Further, the skin-friendly fiber membrane fabric prepared by the above method is obtained, and the bionic knuckle fiber in the membrane fabric is fixed in the conventional fiber network by the water jet process to form a three-dimensional interlocking structure.

[0033] Further, the skin-friendly fiber membrane fabric prepared by the above method is obtained, and the bionic knuckle fiber in the membrane fabric is fixed in the conventional fiber network by the water jet process to form a three-dimensional interlocking structure.

[0034] Further, the skin-friendly fiber membrane fabric prepared by the above method is obtained, and the bionic knuckle fiber in the membrane fabric is fixed in the conventional fiber network by the water jet process to form a three-dimensional interlocking structure.

[0035] By means of the above technical scheme, the present application has the following advantages and beneficial technical effects:

[0036] 1) The process of the present application can effectively improve the adhesion and penetration effect of the film cloth during use, especially in the high curvature area of the face. After using the product for 5 minutes or more, due to the presence of knuckle structure fibers, the fibers can form a certain angle of movement like the knuckles, and after the contact with the essence is infiltrated and expanded, it can form a curved surface according to the curved surface, and the mask product can still be self-adapted to the high curvature area of the face after long-term use. Higher adhesion reduces the generation of air bubbles and voids, further improving the penetration efficiency and skin absorption rate of the mask essence.

[0037] 2) The film cloth containing special knuckle fibers produced by a simple method can form more entanglement points under lower hydroentanglement pressure conditions, and the elastic modulus of the prepared film cloth is close to the elastic modulus of the skin, so that better soft experience can be achieved in wet state while ensuring the mechanical strength of the film cloth. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The microstructure evolution diagram of knuckle fibers (swelling → spinning → setting) is shown.

[0039] Figure 2 The mechanism diagram of multi-angle hydroentanglement forming interlocking structure is shown.

[0040] Figure 3 The micrograph of knuckle structure fibers in wet state is shown.

[0041] Figure 4 The mixed fiber diagram of knuckle fibers and conventional smooth fibers for preparing skin-friendly film cloth is shown.

[0042] Figure 5 The skin-friendly penetration-promoting film cloth containing knuckle fibers prepared in Example 1 is shown.

[0043] Figure 6 The skin-friendly penetration-promoting film cloth containing knuckle fibers prepared in Example 2 is shown.

[0044] Figure 7 The skin-friendly penetration-promoting film cloth containing knuckle fibers prepared in Example 3 is shown.

[0045] Figure 8 The conventional fiber film cloth sample prepared in Comparative Example 1 is shown. DETAILED DESCRIPTION

[0046] The present application will be further described in detail below by specific preferred embodiments in conjunction with the accompanying drawings, but the present application is not limited to the following embodiments.

[0047] The conventional Lycra® fiber film cloth gradually reduces the fit over time and the gradual loss of essence liquid during use. In particular, in the eye area, due to frequent blinking and slight movement of the mouth, the displacement of the film cloth will be more obvious, resulting in further reduction of the fit.

[0048] As shown in Figure 1 , a schematic diagram of the microstructure evolution of the knuckle fiber (swelling → spinning → setting) is shown.

[0049] First, the original pulp treatment is carried out, the dry pulp is mixed with NMMO solution at a certain solid-liquid ratio, and the first wet swelling is completed under negative pressure. The temperature is raised to 78% NMMO, and the second negative pressure is maintained for 20 min. With the passage of time and the increase of NMMO concentration, the fiber from uniform swelling state experiences "spherical" swelling, and then further breaks into smaller fiber solution. Continue to heat to make the pulp finally completely dissolved into concentrated fiber spinning solution.

[0050] After the spinning solution enters the spinning equipment, the air gap height and the micro-pore shear rate are adjusted, so that the axial length of the liquid layer deformation region is close to the air gap height, and the special orientation condition control is completed. By setting the initial shear rate and controlling the lifting speed, the shear rate is slowly increased until the knuckle shape appears periodically in the coagulation bath, and the solidified spinning is taken into the traction shaft. By traction roller shaft traction stretching into two-stage washing, remove excess solvent.

[0051] After removing the excess solvent, it enters the cross-linking liquid, and the antigen fiber is formed. After drying and setting, the stable knuckle structure is formed.

[0052] Figure 2 A mechanism diagram of multi-angle hydroentanglement forming interlocking structure is shown. In the water jet stage, first pass through the first water jet, which is divided into upper and lower, and the water jet angle is controlled at 30-50° and 110-150° respectively. The pressure is 30-80 bar, the upper water jet head is wetted to complete the compaction and surface entanglement of the fiber, the knuckle fiber is preliminarily infiltrated to complete the preliminary entanglement, and the lower water jet head is water jet sprayed to cross and entangle the fiber, the knuckle fiber is further cross and entangled with the conventional fiber; The traction roller shaft is drawn into the second water jet, the water jet angle is 100-120°, the water jet pressure is 100-120 bar, the water jet pressure is increased to perform deep entanglement, at this time the knuckle fiber is infiltrated and expanded to open the activity angle to form curvature, and the "S" structure is interwoven with the conventional fiber to form fiber interlocking. Finally, through the third 90° vertical water jet, the structure interlocking is completed under the water jet pressure of 120-180 bar. It can enter the drying equipment, and after high temperature drying, the roll is completed.

[0053] Figure 3The display is the knuckle structure fiber micrograph in wet state; knuckle fiber, there is a similar joint shape, wet state knuckle fiber forms a certain angle, the fiber presents a micro-curved state. The knuckle structure fiber exists, so that the mask cloth can form a certain angle of movement, after contact with essence infiltration expansion, form a certain curved surface, in contact with the high curvature parts such as alae nasi, canthus, due to the existence of knuckle structure, can produce similar to the joint movement angle, according to the curved surface of the face to form a curved surface, so that the mask product can still maintain adaptive fit in the high curvature area of the face after a long time use. Higher fit degree reduces the generation of air bubbles and voids, and can also improve the penetration efficiency and skin absorption rate of mask essence. The existence of knuckle structure enables more entanglement points to be formed under lower hydroentanglement pressure conditions, while ensuring the mechanical strength of the mask cloth and providing better soft experience in wet state.

[0054] A skin-friendly fiber mask with bionic knuckle interlocking structure, the preparation method comprising the following steps:

[0055] 1. Bionic knuckle fiber preparation

[0056] Primary pulp treatment:

[0057] Mix 20% NMMO aqueous solution with dry pulp, solid-liquid ratio is 1:(7-10);

[0058] Negative pressure (-0.08 MPa) makes the cellulose pulp fully infiltrate, and completes the first 20 min swelling;

[0059] Rise to 80-85℃, concentrate the NMMO solution to 78%, maintain negative pressure for 20 min for secondary swelling; continue to rise and dehydrate to concentrate the NMMO solution to 87%, fully dissolve the cellulose to form a spinning solution.

[0060] Spinning forming:

[0061] Send the spinning solution to the spinning assembly, adjust the air gap height and micropore shear rate, so that the liquid layer deformation area range axial length is close to the air gap height, the initial shear rate is set to 400 s -1 , the lifting speed is 5-10 per second, slowly increase the shear rate until the knuckle shape appears periodically in the coagulation bath, and take the solidified spinning into the traction shaft. The traction roller speed ratio is 1:(2-5), secondary countercurrent washing, remove excess solvent.

[0062] Post-treatment drying and setting:

[0063] After water washing to remove excess solvent, enter the cross-linking liquid, and resist fibrillation;

[0064] Drying machine 110-120℃, air speed 1-3m -1, the stable knuckle structure is formed; the fiber linear density is (0.9-1.3) dtex;

[0065] The coarse knuckle diameter is 11-15 μm, the fine knuckle diameter is 8-10 μm, the diameter ratio (1.1-3) is 1, and the knuckle spacing is 1-35 mm.

[0066] The cutting machine cuts the fiber into staple fibers with a length of 38 mm, and each fiber length contains not less than 1 knuckle.

[0067] 2. Preparation of the interlocking structure nonwoven fabric

[0068] The prepared knuckle fiber is mixed with the smooth conventional fiber at a mass ratio of (1-3) : 10, and after opening and laying, the first water jet is performed, the pre-water jet is performed, and the water jet angle is controlled to be 30-50° and 110-150° respectively, the second water jet is performed by using one water jet column, and the water jet angle is controlled to be 100-120°, the water jet pressure is controlled to be 100-120 bar, the third water jet column is controlled to be perpendicular to 90°, and the water jet pressure is controlled to be 120-180, so that the knuckle structure is uniformly wound in the smooth conventional fiber; drying and lap forming are performed.

[0069] Figure 4 The figure shows the mixed fiber of the knuckle fiber and the conventional smooth fiber for preparing the skin-friendly membrane fabric; compared with the knuckle fiber, the conventional fiber has a smooth surface and is in a straight cylindrical shape. The cutting machine cuts the knuckle fiber into staple fibers with a length of 38 mm, and each fiber length contains not less than 1 knuckle. The prepared knuckle fiber is mixed with the smooth conventional fiber at a mass ratio of (1-3) : 10, and after being uniformly mixed in the mixing box, carding and laying are performed.

[0070] Example 1

[0071] A skin-friendly fiber membrane fabric with a bionic knuckle interlocking structure, and a preparation method thereof, the preparation method comprising the following steps

[0072] Preparation of the knuckle fiber

[0073] 1. Mixing and swelling

[0074] The dry cellulose pulp is mixed with 20% NMMO aqueous solution at a solid-liquid ratio of 1:8, and the first swelling is completed by stirring in a vacuum reaction kettle (-0.08 MPa) for 20 minutes. The temperature is increased to 80℃, and the second swelling is maintained under negative pressure for 20 minutes. The NMMO concentration is concentrated to 78%. The temperature is continuously increased to 105℃, and the NMMO concentration is increased to 87% by vacuum dehydration to form a uniform spinning solution.

[0075] 2. Spinning and forming

[0076] The device uses a spinneret (pore diameter 0.12 mm, number of holes 200 holes, length-diameter ratio L / D = 5), the air gap height is adjusted to 18 mm,

[0077] Coagulation bath: 10% NMMO aqueous solution, temperature 25℃;

[0078] Dynamic regulation: the initial shear rate is set to 400 s -1 , gradually increased to 2400 s -1 , the speed of increase is 5 s per second -1 , the periodic aggregation of cellulose molecular chains is induced, and knuckle structures are formed in the coagulation bath (thick knuckle diameter 15 μm, thin knuckle diameter 10 μm). The speed ratio of the traction roller is 1:3.5.

[0079] 3. Post-treatment setting

[0080] Water washing: after secondary countercurrent washing (60℃ pure water), crosslinking agent crosslinking treatment for 30 minutes;

[0081] Drying setting: hot air drying (110℃, air speed 2 m / s), the fiber moisture regain is controlled at 8-10%. The fiber linear density is 1.3 dtex;

[0082] Knuckle film cloth preparation:

[0083] 1. Fiber mixing and opening

[0084] Fiber ratio: biomimetic knuckle fiber 10% + conventional lyocell fiber 90% (linear density 1.3 dtex) mixed in the cotton mixing box for 1 hour, opening roller speed 800 rpm,

[0085] 2. Spunlace film cloth forming

[0086] Spunlace film cloth forming Figure 5 The picture shows a skin-friendly penetration-promoting film cloth sample containing knuckle fibers prepared according to Example 1. As can be seen from the picture, the film cloth has a moderate thickness, the overall distribution of fibers on the cloth surface is uniform, the transverse and longitudinal entanglement of fibers is good, and there is no abnormal neps on the front and back of the film cloth. The cloth surface is soft.

[0087] Example 2

[0088] A skin-friendly fiber film cloth with a biomimetic knuckle interlocking structure, the preparation method comprising the following steps:

[0089] Knuckle fiber preparation:

[0090] 1. Mixing and swelling:

[0091] Dry cellulose pulp was mixed with 20% NMMO aqueous solution at a solid-liquid ratio of 1:8. The mixture was stirred in a vacuum reactor (-0.08 MPa) for 20 minutes to complete the first swelling. The temperature was raised to 80°C, and the second swelling was maintained for 20 minutes under negative pressure. The concentration of NMMO was concentrated to 78%. The temperature was continuously raised to 105°C, and vacuum dehydration was performed to make the concentration of NMMO reach 87%, forming a uniform spinning solution.

[0092] 2. Spinning forming:

[0093] The device used a spinneret (pore size 0.12 mm, number of holes 200, length-diameter ratio L / D = 5), and the air gap height was adjusted to 18 mm.

[0094] Coagulation bath: 10% NMMO aqueous solution, temperature 25°C;

[0095] Dynamic control: the initial shear rate was set to 400 s -1 , gradually increased to 2400 s -1 , the speed of increase was 5 s per second -1 , inducing periodic aggregation of cellulose molecular chains, forming knuckle structures (thick section diameter 12 μm, thin section diameter 10 μm) in the coagulation bath. The speed ratio of the drawing roller was 1:3.5.

[0096] 3. Post-processing shaping

[0097] Water washing: after secondary countercurrent washing (60°C pure water), crosslinking agent crosslinking treatment for 30 minutes;

[0098] Dry shaping F type: hot air drying (110°C, air speed 2 m / s), fiber moisture content controlled at 8-10%. The linear density of the fiber was 1.3 dtex.

[0099] Knuckle film cloth preparation:

[0100] 1. Fiber mixing and opening

[0101] Fiber ratio: biomimetic knuckle fiber 5% + conventional lyocell fiber 95% (linear density 1.3 dtex) mixed in the cotton mixing box for 1 hour, opening roller speed 800 rpm,

[0102] 2. Spunlace film cloth forming

[0103] Carding and water jetting, first water jetting, 30° up water jet 80 bar, 150° down water jet 80 bar, second water jetting, 120° water jet 120 bar, third water jetting, 180° water jet 180 bar. Enter the drying equipment for drying and winding. Figure 6The display is the knuckle fiber-containing skin-friendly penetration membrane cloth sample prepared in Example 2. As can be seen from the figure, the thickness of the membrane cloth is moderate, the overall distribution of the fibers on the cloth surface is uniform, the transverse and longitudinal entanglement degrees of the fibers are good, and there is no abnormal neps on the front and back surfaces of the membrane cloth. The cloth surface is soft.

[0104] Example 3

[0105] A skin-friendly fiber membrane cloth with a bionic knuckle interlocking structure, the preparation method comprising the following steps:

[0106] Knuckle fiber preparation:

[0107] 1. Mixing and swelling:

[0108] Dry cellulose pulp and 20% NMMO aqueous solution, the pulp and NMMO solution are mixed at a solid-liquid ratio of 1:8, and the first swelling is completed in a vacuum reaction kettle (-0.08 MPa) for 20 minutes. The temperature is raised to 80℃, and the second swelling is maintained under negative pressure for 20 minutes. The concentration of NMMO is concentrated to 78%. Continue to raise the temperature to 105℃, and vacuum dehydration to make the concentration of NMMO reach 87%, forming a uniform spinning solution.

[0109] 2. Spinning forming:

[0110] The equipment uses a spinneret (pore diameter 0.12 mm, number of holes 200, length-diameter ratio L / D=5), and the air gap height is adjusted to 18 mm.

[0111] Coagulation bath: 10% NMMO aqueous solution, temperature 25℃;

[0112] Dynamic regulation: the initial shear rate is set to 400s -1 , gradually increased to 2400s -1 , the speed of increase is 10s per second -1 Inducing periodic aggregation of cellulose molecular chains, forming knuckle structure (thick knuckle diameter 11μm, thin knuckle diameter 8μm) in the coagulation bath. The speed ratio of the traction roller is 1:3.5.

[0113] 3. Post-treatment setting

[0114] Water washing: after two-stage countercurrent washing (60℃ pure water), crosslinking agent crosslinking treatment for 30 minutes;

[0115] Drying and setting: hot air drying (110℃, air speed 2m / s), the moisture regain of the fiber is controlled at 8-10%. The linear density of the fiber is 1.3dtex.

[0116] Preparation of knuckle membrane cloth:

[0117] 1. Fiber mixing and opening

[0118] Fiber ratio: 1% bionic knuckle fiber + 99% conventional lyocell fiber (linear density 1.3 dtex) mixed in a cotton mixing box for 1 hour, and the opening roller speed is 800 rpm,

[0119] 2. Forming of the spunlace film

[0120] Carding and laying, first water jet, 30° up 80 bar, 150° down 80 bar, second water jet, 120° 120 bar, third water jet, 180° 180 bar. Enter the drying equipment to dry the lap. Figure 7 The skin-friendly penetration film sample containing knuckle fibers prepared in Example 3 is shown. As can be seen from the figure, the film has a moderate thickness, the overall fiber distribution on the cloth surface is uniform, the fiber transverse and longitudinal entanglement is good, and there is no abnormal neps on the front and back of the film. The cloth surface is soft.

[0121] Comparative Example 1

[0122] Mix the dry cellulose pulp with 20% NMMO aqueous solution at a solid-liquid ratio of 1:8, and perform one-time swelling under a negative pressure of -0.08 MPa for 20 minutes;

[0123] Warm up to 80°C to concentrate the NMMO solution to 78%, and maintain the negative pressure for secondary swelling for 20 minutes;

[0124] Continue to warm up to 105°C for vacuum dehydration to make the NMMO concentration reach 87%, forming a uniform spinning solution;

[0125] Use a spinneret to spin, with an air gap height of 18 mm, a coagulation bath of 10% NMMO aqueous solution at 25°C, an initial shear rate of 200 s -1 and gradually increase to 800 s -1 at a speed of 5 s per second -1 , and the fiber is smooth and uniform.

[0126] Preparation of a conventional smooth lyocell fiber film:

[0127] 1. Fiber mixing and opening

[0128] Fiber ratio: 100% conventional smooth lyocell fiber (linear density 1.3 dtex) mixed in a cotton mixing box for 1 hour, and the opening roller speed is 800 rpm,

[0129] 2. Forming of the spunlace film

[0130] Carding and laying, first water jet, 30° up 80 bar, 150° down 80 bar, second water jet, 120° 120 bar, third water jet, 180° 180 bar. Enter the drying equipment to dry the lap. Figure 8The display is a conventional smooth lyocell film cloth sample prepared by Comparative Example 1. As can be seen from the figure, the film cloth has a relatively moderate thickness. Due to the cylindrical shape of the conventional fibers, part of the fibers fail to penetrate and entangle in the water jet direction under the same water jet process, and the "deviation" is concentrated in the cloth surface, which is relatively thick in the middle. The film cloth has good entanglement in the transverse and longitudinal directions, no abnormal nubs, and a relatively soft surface.

[0131] Comparative Example 2

[0132] The dry cellulose pulp was mixed with 20% NMMO aqueous solution at a solid-liquid ratio of 1:8, and was subjected to one-time swelling under a negative pressure of-0.08 MPa for 20 minutes;

[0133] The temperature was increased to 80°C to concentrate the NMMO solution to 78%, and the negative pressure was maintained for secondary swelling for 20 minutes;

[0134] The temperature was continuously increased to 105°C for vacuum dehydration to make the NMMO concentration reach 87%, forming a uniform spinning solution;

[0135] Spinning was performed using a spinneret with a gas gap height of 18 mm, a coagulation bath of 10% NMMO aqueous solution at 25°C, and a shear rate of 2400 s -1 , the fiber turbulence entanglement blocked the spinneret hole, and the induction failed.

[0136] The following are the efficacy test examples of the product of the present application.

[0137] Example 1

[0138] Example comparison: The implementation sample was matched with the essence liquid to prepare a facial mask, and 30 healthy people aged 25-40 years old were evaluated for satisfaction. The experimental environment was controlled at a humidity of 50±10% and a temperature of 21±1%. The subjects first sat quietly for 30 minutes under the condition, and then entered the formal use experience evaluation. The use method was as follows: after cleansing, the facial mask was taken out and applied to the face, and was applied statically. The satisfaction evaluation of the facial mask product was carried out at 5 min, 10 min and 20 min, as shown in Table 1 below.

[0139] Table 1 Satisfaction evaluation of facial mask product of different examples and comparative examples on facial adhesion

[0140]

[0141] As can be seen from Table 1, the mixing improves the tensile breaking strength of the film cloth made of knuckle fibers, and the more the knuckle fiber content, the relatively higher the mechanical strength. With the addition of knuckle fibers, the wet modulus of elasticity of the film cloth is significantly reduced, the wet modulus of elasticity in the micro-strain range is closer to the elastic modulus of the skin (0.64±1Mpa), and after use for 5 minutes or longer, a better fitting effect is maintained, and the satisfaction degree of the face fitting evaluation of the crowd is higher.

[0142] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification of the above embodiment without departing from the technical solution content of the present application, and in accordance with the technical essence of the present application, all still belong to the scope of the technical solution of the present application.

Claims

1. A method of making a skin-friendly, penetration-enhancing fibrous membrane cloth, characterized by: The method comprises the following steps: 1) Preparation of bionic knuckle fibers: Dry cellulose pulp is mixed with 20% NMMO aqueous solution at a solid-liquid ratio of 1:8, and is subjected to one-time swelling under a negative pressure of -0.08 MPa for 20 minutes; The temperature is raised to 80°C to concentrate the NMMO solution to 78%, and the negative pressure is maintained for two-time swelling for 20 minutes; The temperature is continuously raised to 105°C for vacuum dehydration to make the concentration of NMMO reach 87%, and a uniform spinning solution is formed; The spinning is carried out by using a spinneret, the air gap height is 18 mm, the coagulation bath is 10% NMMO aqueous solution at 25°C, the initial shear rate is 400 s -1 and is gradually increased to 2400 s -1 at a speed of 5-10 s per second, so as to induce the formation of the periodic knuckle structure fiber; After two-stage countercurrent washing and crosslinking treatment, the fiber with a linear density of 0.9-1.3 dtex is prepared by hot air drying at 110°C; 2) Preparation of interlocking structure non-woven fabric: The knuckle fibers prepared in step 1) are mixed with conventional lyocell fibers at a mass ratio of (1-3):10; After laying, a three-stage water jet process is adopted: the first stage is water jet at an angle of 30-50° and 110-150°, respectively, and the pressure is 30-80 bar; the second stage is water jet at an angle of 100-120°, and the pressure is 100-120 bar; and the third stage is water jet at an angle of 90°, and the pressure is 120-180 bar; After drying, the skin-friendly fiber membrane fabric is prepared.

2. The preparation method according to claim 1, characterized in that: First, the raw pulp is treated, the dry pulp is mixed with the NMMO solution at a certain solid-liquid ratio, and the negative pressure is used to complete one-time wet swelling and expansion, the temperature is raised to gradually concentrate the NMMO to 78%, and the negative pressure is maintained for two-time swelling for 20 minutes; as time goes on and the concentration of NMMO increases, the fibers undergo "spherical" swelling and further break into smaller fibers, and the pulp is finally completely dissolved into a concentrated fiber spinning solution; After the spinning solution enters the spinning equipment, the air gap height and the micro-pore shear rate are adjusted, so that the axial length of the liquid layer deformation region is close to the air gap height; by setting the initial shear rate and controlling the lifting speed, the shear rate is slowly increased until the knuckle shape appears periodically in the coagulation bath, and the solidified spinning is taken into the traction shaft; the fibers are drawn into the two-stage water washing by the traction roller shaft to remove excess solvent; After removing the excess solvent, the fibers are subjected to crosslinking to resist fibrillation, dried and shaped to form a stable knuckle structure.

3. The preparation method according to claim 1, characterized in that: In the water jet stage, the fibers are first subjected to the first stage of water jet, which is divided into two stages, and the water jet angles are controlled to be 30-50° and 110-150°, respectively, and the pressure is 30-80 bar; the upper water jet head is used to complete the compaction and surface entanglement of the fibers, the knuckle fibers are preliminarily infiltrated and entangled, and the lower water jet head is used for water jet spraying to entangle the fibers, and the knuckle fibers are further entangled with the conventional fibers; The fibers are drawn into the second stage of water jet by the traction roller shaft, the water jet angle is 100-120°, and the water jet pressure is 100-120 bar; the water jet pressure is increased to perform deep entanglement, at this time, the knuckle fibers are infiltrated and expanded to form curvature, and the "S" structure is interwoven with the conventional fibers to form fiber interlocking; Finally, the fibers are subjected to the third stage of 90° vertical water jet, and the water jet pressure is 120-180 bar to complete the structure interlocking; then the fibers are taken into the drying equipment, and after high-temperature drying, the fibers are finished and rolled.

4. The method of claim 1, wherein: The thick section diameter of the knuckle fiber is 11-15 μm, the thin section diameter is 8-10 μm, the diameter ratio is (1.1-3):1, and the bamboo joint spacing is 1-35 mm.

5. The method of claim 1, wherein: The spinneret aperture is 0.07-0.12 mm, the number of holes is 20-300, and the length-diameter ratio L / D is 0.2-5.

6. The method of claim 1, wherein: The cross-linking treatment adopts an epoxy cross-linking agent, and the treatment time is 30 minutes.

7. The method of claim 1, wherein: The linear density of the conventional lyocell fiber is 1.3 dtex.

8. A skin-friendly penetration enhancing fibrous membrane cloth prepared by the method of any one of claims 1 to 7, characterized in that: The biomimetic knuckle fiber in the film cloth is fixed in the network of conventional fibers by a water jet process to form a three-dimensional interlocking structure.

9. The skin-friendly penetration-promoting fibrous membrane cloth according to claim 8, characterized by: After the film cloth is soaked in the essence, the knuckle structure can produce an activity angle of 5°-15° to adapt to the curvature change of the face. 10.The application of the skin-friendly penetration-promoting fiber film cloth of claim 8 or 9 in a facial, neck, eye, hand film, foot film care film cloth or in a medical dressing.

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