CN112176525A - One-way water guide mask base material and preparation method thereof - Google Patents

One-way water guide mask base material and preparation method thereof Download PDF

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Publication number
CN112176525A
CN112176525A CN202011013368.3A CN202011013368A CN112176525A CN 112176525 A CN112176525 A CN 112176525A CN 202011013368 A CN202011013368 A CN 202011013368A CN 112176525 A CN112176525 A CN 112176525A
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fiber
chitosan
polyvinyl alcohol
water
mask
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CN112176525B (en
Inventor
朱宏伟
王玉萍
王新标
徐熊耀
乔国华
许国良
李萌
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Zhejiang Wangjin Nonwovens Co ltd
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Zhejiang Wangjin Nonwovens Co ltd
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Publication of CN112176525A publication Critical patent/CN112176525A/en
Priority to PCT/CN2021/114913 priority patent/WO2022062830A1/en
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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
    • D04H1/4374—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 using different kinds of webs, e.g. by layering webs
    • 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
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • 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
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
    • 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
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • 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
    • D04H1/4282—Addition polymers
    • D04H1/4309—Polyvinyl alcohol
    • 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
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • 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
    • D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/492—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/01—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural macromolecular compounds or derivatives thereof
    • D06M15/03—Polysaccharides or derivatives thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/24—Polymers or copolymers of alkenylalcohols or esters thereof; Polymers or copolymers of alkenylethers, acetals or ketones

Abstract

The invention relates to a one-way water guide mask base material which is of a three-layer structure, wherein the upper layer is hydrophobic modified polyester fiber, the middle layer is chitosan modified polyvinyl alcohol fiber, and the lower layer is viscose fiber; and after the hydrophobic modified polyester fiber, the chitosan modified polyvinyl alcohol fiber and the viscose fiber are combed into a net and compounded, the composite material is obtained by spunlacing reinforcement. According to the invention, three fiber layers made of different materials are compounded, and the obtained mask base material has one-way vertical water guide, so that after the mask absorbs the nutrient essence, the nutrient essence can be directionally and vertically transmitted from top to bottom, the nutrient solution absorption efficiency is maximized, and no nutrient solution is wasted. The surface density and the compounding angle of each fiber layer and the synergistic effect of the upper, middle and lower fiber layers ensure that the obtained mask base material has excellent total performance, unidirectional water guiding performance, excellent water absorbing and retaining performance and good air permeability and moisture permeability of humidity. The full absorption of the face skin to the nutrient solution is ensured, and the texture of the mask is comfortable and soft.

Description

One-way water guide mask base material and preparation method thereof
Technical Field
The invention belongs to the technical field of mask base materials, and particularly relates to a one-way water guide mask base material and a preparation method thereof.
Background
With the increasing living standard of people, women and even men pay more and more attention to skin care, and in daily use of skin care products, the mask product is in the front. The facial masks are of various types and can be mainly divided into four types, namely a face pasting mask (a patch type facial mask), a gel facial mask, a powder facial mask, a paste facial mask and the like according to product forms. The mask has the characteristics of convenient carrying, simple and quick use and long-term storage, and becomes the most popular mask type for consumers. The data show that more than 80 percent of the facial masks sold in the market at present are facial masks, and the facial masks mainly take non-woven base cloth as a carrier, so that the absorption speed and the absorption amount of the skin to nutrient components in nutrient solution can be improved.
The commercially available non-woven mask base cloth mainly takes cotton, viscose, tencel, cuprammonium fiber and wood pulp fiber as main raw materials, and a few products adopt chitin fiber, silk fiber and the like. The production process of the product mainly comprises the production modes of a spunlace method, wet-method spun bonding, dry-method papermaking and the like. The application of the non-woven material compounded by the spunlace process in the field of sanitary products is developed vigorously, and the spunlace non-woven fabric mask becomes the popular mask preference in time due to low price and high yield. The development of the spunlace nonwoven fabric for the facial mask aims to exert the effect to the maximum extent, so that the skin can absorb essence to the maximum extent, and the optimal use experience and effect are brought to people. The development trend of the facial mask can be summarized as follows: comfortable, light, thin, soft, easy to form, transparent and invisible, high in moisture retention, functional and non-deformable. Because the beauty effect of the facial mask is realized by the nutrient solution carried by the mask cloth, the facial mask base cloth is used as a carrier of the nutrient solution, and the using effect of the facial mask is directly influenced by the amount of the carried nutrient solution. The base cloth has too little liquid holding capacity and unobvious beautifying effect, and simultaneously, the facial mask is dried quickly due to the absorption of the skin and the volatilization of the facial mask, so that the facial mask absorbs water from the skin and cannot play a role in maintenance. The facial mask is used for preventing the skin from contacting with air by covering the facial mask for a short time, and inhibiting the evaporation of skin moisture, so that the sufficient moisture of the facial skin is kept; meanwhile, the mask carries water to fully moisten the skin cuticle, so that the permeability of the cuticle is enhanced, nutrient substances in the mask can effectively permeate into the skin, and the metabolism of epithelial tissue cells is promoted. Because the beauty effect of the facial mask is realized by the nutrient solution carried by the mask cloth, the facial mask base cloth is used as a carrier of the nutrient solution, and the using effect of the facial mask is directly influenced by the amount of the carried nutrient solution. The base cloth has too little liquid holding capacity and unobvious beautifying effect, and simultaneously, the facial mask is dried quickly due to the absorption of the skin and the volatilization of the facial mask, so that the facial mask absorbs water from the skin and cannot play a role in maintenance. Therefore, the mask material is comfortable, soft, light and thin in fabric, and simultaneously has higher liquid holding capacity and water locking (volatilization prevention) performance.
Recently, scientists have proposed the concept of one-way water diversion, which means that water flows irreversibly in a single direction when passing through a substance or material having a specific structure. This phenomenon is common in nature, such as cell membrane fluid exchange, and plants absorb water from the soil. The unidirectional water guide is applied to the field of fabrics, particularly to a base material of a mask, and can solve the problems of water locking and water retention of the mask. The key of preparing the one-way water guide material lies in the differential capillary effect and the gradient wettability of the material, so that the differential capillary effect is generated, and the directional movement of water in the material without external driving force is formed. However, most of the existing raw materials and preparation methods of some single-direction water guide materials adopt chemical finishing methods, such as fluorine-containing hydrophobic treatment, which is not beneficial to the environment and human health and is not suitable for mask materials. And the use of toxic chemical finishing agents is avoided by modifying the surface of the material by a plasma method, but the method is high in cost and has obvious time limit, and the duration of the one-way water guide effect after treatment is short.
Disclosure of Invention
The invention takes hydrophobic fiber and hydrophilic fiber as raw materials, so that the hydrophilic-hydrophobic difference of the two surfaces of the mask base material is large enough, the moisture absorption difference between the upper layer fiber and the lower layer fiber forms a differential capillary effect, and the directional water guiding of the material is realized. Meanwhile, the material is used as a mask base material, the viscose fiber layer is tightly attached to the skin, and the polyester fiber layer is exposed in the air, so that the moisture evaporation can be prevented, and the moisture can be effectively locked. The mask base material obtained by the invention has high water retention rate and strong water shrinkage capacity, can keep the water retention rate of the essence in the mask for more than 2 hours to be more than 90%, and simultaneously has good air permeability while having water retention property due to proper aperture. As a facial mask, it is comfortable and soft, and does not make skin uncomfortable.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a one-way water guide mask base material is of a three-layer structure, wherein the upper layer is hydrophobic modified polyester fiber, the middle layer is chitosan modified polyvinyl alcohol fiber, and the lower layer is viscose fiber; and after the hydrophobic modified polyester fiber, the chitosan modified polyvinyl alcohol fiber and the viscose fiber are combed into a net and compounded, the composite material is obtained by spunlacing reinforcement.
The compounding is that the two fibers are compounded at 30-60 degrees. The compound angle here is an angle in the MD direction (machine output direction) of the two webs being combined.
Preferably, the hydrophobic modified polyester fiber net and the chitosan modified polyvinyl alcohol fiber net are compounded at 30 degrees +/-5 degrees, and the chitosan modified polyvinyl alcohol fiber net and the viscose fiber net are compounded at 45 degrees +/-5 degrees. The inventors have unexpectedly found that a mask base material having vertical water-conducting properties and excellent water retentivity and air permeability can be finally obtained by the above-mentioned composite method. The preparation method of the hydrophobic modified polyester fiber comprises the following steps: carrying out prepolymerization and polycondensation on terephthalic acid, butanediol and castor oil modified polyol to obtain polyester; polyester and polyethylene glycol are subjected to melt extrusion granulation to obtain master batches; and carrying out melt spinning, cooling, drafting and winding to prepare the hydrophobic modified polyester fiber.
Further, the hydroxyl value of the castor oil modified polyol is 50-80mg KOH/g, the acid value is 0.1-0.6mg KOH/g, the number average molecular weight is 2000-5000, and the functionality is 2-3.
Further, the molar ratio of terephthalic acid, butanediol and castor oil modified polyol is 110-: 100-120: 5-10; the reaction conditions of the prepolymerization stage are that the temperature is 230-250 ℃, the pressure is-0.05-0.1 MPa, and the prepolymerization time is 0.5-1 h; the reaction conditions of the polycondensation stage are that a polycondensation catalyst is added, the temperature is 260 ℃ and 275 ℃, the vacuum degree is 0.01-0.05Mpa, and the polycondensation time is 3-5 h. The polycondensation catalyst is Sb2O3The amount used is 0.5 to 1.5% by weight based on the total mass of the starting monomers (terephthalic acid, butanediol and castor oil-modified polyol).
The viscosity average molecular weight of the obtained polyester was 2X 105To 3X 105g/mol。
The mass ratio of the polyester chip to the polyethylene glycol is 100: 5-10, and the number average molecular weight of the polyethylene glycol is 400-600. The temperature of the melt extrusion granulation is 190-230 ℃. Preferably, a twin-screw extruder is used, the temperature parameters of each zone being: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third zone, 220 ℃ in the fourth zone, 230 ℃ in the fifth zone and 220 ℃ in the sixth zone.
Preferably, various auxiliary agents such as a lubricant, an antibacterial agent and an antioxidant can be added during extrusion granulation.
The kind and addition amount of each adjuvant are well known in the art, and specifically, the lubricant is selected from pentaerythritol stearate, polyvinylpyrrolidone; the antibacterial agent is selected from nano silver and quaternary ammonium salt; the antioxidant is selected from BHT1010 and 2246; the addition amount of various additives is 0.1-3% of the mass of the polyester.
The melt spinning process comprises the following steps of spinning temperature of 295-: 2600-.
The chitosan modified polyvinyl alcohol fiber is prepared by the following preparation method: soaking polyvinyl alcohol fiber in acetic acid solution of chitosan, and drying.
Furthermore, in the acetic acid solution of chitosan, the concentration of chitosan is 3-5 wt%, and the concentration of acetic acid is 5-10 wt%; the dipping time is 3-5 h.
The viscose fibers are preferably strong viscose fibers, and the dry strength is 35-50cN/tex, preferably 38-44 cN/tex.
The viscose fiber has good water absorption, hydrophilicity and natural degradability, and is very suitable for being used as a material of the mask.
Preferably, in the step of carding, the surface density of the hydrophobic modified polyester fiber after carding is 20-25g/m2The surface density of the chitosan modified polyvinyl alcohol fiber after being carded is 15 to 20g/m2The surface density of the viscose fiber obtained after carding is 10-15g/m2. More preferably, after the three fibers are carded, the surface density is decreased in the order of the hydrophobic modified polyester fiber net, the chitosan modified polyvinyl alcohol fiber net and the viscose fiber net.
The inventor finds that mutually winding the three fibers from top to bottom through hydroentanglement with gradually reduced areal density is more beneficial to the performance of the obtained material for one-way water diversion, and can keep excellent air permeability.
The technological conditions of the spunlace reinforcement are that a spunlace machine is used for prewetting the chitosan modified polyvinyl alcohol fiber layer, and then 3-5 spunlace reinforcement is carried out.
Preferably, the pre-wetted hydroentangling water pressure is 1.5-2.0 MPa; the water pressure of the 3-5 times of water jetting is gradually increased and then gradually decreased. The water pressure of the first and the last spunlace is 4.5-5MPa, and the water pressure of the intermediate spunlace is 6.5-9.5 MPa. For example, if 3 times of water jet, the water pressure of the first and last water jet is 4.5-5MPa, and the water pressure of the second water jet is 7.5-8 MPa; if the number of the water jet holes is 5, the water pressure of the first water jet hole and the last water jet hole is 4.5-5MPa, the water pressure of the second water jet hole and the fourth water jet hole is 6.5-7.5MPa, and the water pressure of the third water jet hole is 8.5-9.5 MPa.
Further preferably, the action distance of the water needle stimulated by water is 12-20mm, preferably 14-16 mm; the net conveying roller shutter speed is 50-100m/s, preferably 70-90 m/s.
The spunlace reinforcement is to continuously spray the fiber web through high-pressure water flow, and under the action of hydraulic power, the fibers in each fiber layer are displaced, rearranged and intertwined with each other, so that the three fiber webs are compounded into a whole. The spunlace process ensures that the mask base cloth has high strength, soft hand feeling, no chemical adhesive and good air permeability, and meets the use requirements.
The invention also provides a preparation method of the one-way water guide mask base material, which comprises the following steps: the hydrophobic modified polyester fiber and the viscose fiber are obtained by opening, carding, forming a net, compounding, spunlacing, reinforcing, drying and curling respectively.
Compared with the prior art, the one-way water guide mask base material provided by the invention has the following beneficial effects:
according to the invention, three fiber layers made of different materials are compounded, and the obtained facial mask base material has one-way vertical water guide, so that after the facial mask absorbs the nutrient essence, the nutrient essence can be directionally and vertically transmitted from top to bottom, the nutrient solution absorption efficiency is maximized, and no nutrient solution is wasted.
In the mask base material with the three-layer composite structure, three layers of materials play a synergistic role; the modified polyester fiber layer on the uppermost layer can fully lock water, and volatilization and loss are reduced; the polyvinyl alcohol fiber layer treated by the chitosan in the middle layer has good water absorption and large liquid holdup; the viscose fiber at the lowest layer keeps good and comfortable and soft touch with the skin. The surface density and the compounding angle of each fiber layer and the synergistic effect of the upper, middle and lower fiber layers are selected by a proper spunlace reinforcement process, so that the obtained mask base material has excellent total performance, unidirectional water guiding performance, excellent water absorbing and retaining performance and good air permeability and moisture permeability of humidity. The full absorption of the face skin to the nutrient solution is ensured, and the texture of the mask is comfortable and soft.
Detailed Description
Chitosan was purchased from Onkang, Shandong, Biotech, Inc., having a molecular weight of 70kDa and a degree of deacetylation of 75%.
The polyvinyl alcohol fiber is purchased from Taian macrofiber Co, Ltd, has fineness of 2.3dtex, strength of 13.5cN/dtex and specific gravity of 1.29g/cm3。
The viscose fiber is purchased from Quanzhou Haitian light textile Co., Ltd, and has the strength of 26.5 cN/dtex.
The castor oil-modified polyol was purchased from Van. RTM., trade designation D2000, molecular weight 2000, hydroxyl number 56mg KOH/g, acid number 0.3mg KOH/g, functionality 3.
Preparation example 1
Adding terephthalic acid, butanediol and castor oil modified polyol into a reaction kettle, wherein the molar ratio of the terephthalic acid to the butanediol to the castor oil modified polyol is 120: 100: 10, pre-polymerizing for 1h at 230 ℃ and the relative pressure of-0.05 MPa; then adding 1 wt% of polycondensation catalyst Sb of monomer (the sum of terephthalic acid, butanediol and castor oil modified polyol)2O3And carrying out polycondensation at 270 ℃ and 0.01MPa for 5h, detecting that the acid value of a system is lower than 10mg KOH/g, stopping the reaction, filtering to remove impurities, casting the mixture into a belt, cutting the polyester into slices by using particles, and measuring the viscosity-average molecular weight of the obtained polyester to be 23400 g/mol.
Adding the obtained 100 parts of polyester slices, 7 parts of PEG600, 0.5 part of nano-silver, 1.1 part of pentaerythritol stearate and 0.8 part of antioxidant 2246 into a double-screw extruder for extrusion granulation, wherein the process of the double-screw extruder is as follows: the temperature parameters of each zone are as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third zone, 220 ℃ in the fourth zone, 230 ℃ in the fifth zone, 220 ℃ in the sixth zone and 260r/min of rotation speed.
And carrying out melt spinning, cooling, drafting and winding on the obtained modified polyester master batch to obtain the hydrophobic modified polyester fiber. The melt spinning process comprises the following steps of spinning temperature 300 ℃, setting temperature 150 ℃, POY spinning speed: 2600m/min, POY draft multiple 2 times, FDY spinning speed 4200m/min, FDY draft multiple 3 times, winding speed 3000 r/min.
Preparation example 2
The other conditions and procedure were the same as in preparation example 1 except that the molar ratio of the castor oil-modified polyol, terephthalic acid, butylene glycol, castor oil-modified polyol was 120: 100: 5.
preparation example 3
And (3) soaking the polyvinyl alcohol fiber in an acetic acid solution of chitosan for 4 hours, taking out and drying to obtain the chitosan modified polyvinyl alcohol fiber, wherein the concentration of the chitosan is 3 wt% and the concentration of the acetic acid is 6 wt%.
Comparative preparation example 1
The other conditions and procedures were the same as in preparation example 1 except that no castor oil-modified polyol was added.
Example 1
The hydrophobic modified polyester fiber obtained in preparation example 1, the chitosan modified polyvinyl alcohol fiber obtained in preparation example 3 and the viscose fiber are respectively loosened and carded into a web. The injection amount is controlled so that the surface density of the hydrophobically modified polyester fiber web is 20g/m2The surface density of the chitosan modified polyvinyl alcohol fiber after being combed is 15g/m2The surface density of the viscose fiber obtained after carding is 10g/m2. Compounding the hydrophobic modified polyester fiber net, the chitosan modified polyvinyl alcohol fiber net and the viscose fiber net from top to bottom, wherein the hydrophobic modified polyester fiber net and the chitosan modified polyvinyl alcohol fiber net are compounded at 30 degrees, the chitosan modified polyvinyl alcohol fiber net and the viscose fiber net are compounded at 45 degrees, and performing spunlace reinforcement after compounding. The spunlace reinforcement process comprises the following steps: firstly, pre-wetting a chitosan modified polyvinyl alcohol fiber layer, wherein the water pressure of spunlace is 1.5 MPa; and 3 times of spunlace reinforcement, wherein the water pressure of the first spunlace is 4.5MPa, the water pressure of the second spunlace is 7.5MPa, and the water pressure of the third spunlace is 4.5 MPa. The acting distance of the water needle stimulated by water is 14 mm; the speed of the net conveying roller shutter is 180 m/s. And (5) drying after spunlacing and reinforcing, and curling to obtain the one-way water guide mask base material.
Example 2
The other steps and conditions were the same as those of example 1 except that the hydrophobic modified polyester fiber of preparation example 1 was replaced with the hydrophobic polyester fiber prepared in preparation example 2.
Example 3
The other steps and conditions were the same as in example 1 except that the injection amount was controlled so that the areal density of the hydrophobically modified polyester fiber web was 15g/m2The surface density of the chitosan modified polyvinyl alcohol fiber after being combed is 15g/m2The surface density of the viscose fiber is 15g/m after being carded2。
Example 4
The other steps and conditions were the same as in example 1 except that the hydrophobically modified polyester fiber web and the chitosan modified polyvinyl alcohol fiber web, the chitosan modified polyvinyl alcohol fiber web and the viscose fiber web were each 30 ° composite.
Example 5
The other steps and conditions were the same as in example 1 except that the hydrophobically modified polyester fiber web and the chitosan modified polyvinyl alcohol fiber web, the chitosan modified polyvinyl alcohol fiber web and the viscose fiber web were each compounded at 45 °.
Comparative example 1
The other steps and conditions were the same as in example 1 except that the hydrophobically modified polyester fiber of preparation example 1 was replaced with polybutylene terephthalate (PBT) fiber prepared in comparative preparation example 1.
Comparative example 2
The other steps and conditions were the same as in example 1 except that the chitosan-modified polyvinyl alcohol fiber obtained in preparation example 3 was replaced with a common polyvinyl alcohol fiber which was not treated with the chitosan acetic acid solution.
Application example 1Mechanical testing of mask substrates
Referring to GB/T24218.3-2010 part 3, the mask substrate was tested for breaking strength and elongation at break in dry and wet states using a model YG028-500 extensometer. The mask base material was cut to a size of 50mm × 200mm, the holding distance was 100mm, the stretching speed was 100mm/min, and the stretching experiment was performed in a constant stretching manner.
The mechanical property test under the wet state is to soak the mask base material in distilled water for 10min and take out after fully washing the water, and immediately test the mechanical property of the mask base material. The mask substrate was dried and wet, each group of samples was tested 10 times and the data were averaged. The results are shown in table 1 below:
TABLE 1
Figure BDA0002698267350000071
Application example 2Water absorption and Water Retention evaluation
The water absorbency and water retention of the mask substrate of the examples of the present invention were tested with reference to the measurement of absorbency of GB/T24218.6-2010. The mask base material is cut into 10cm × 10 cm.
The water absorption is expressed as the liquid absorption S (g/g), S0＝(m1-m0)/m0In the formula, m1Showing the mass m of the film substrate after the film substrate is soaked in distilled water for 10min and taken out, the sample is vertically hung on a metal copper net, and the film substrate is kept stand for 1min to drain excessive water0Denotes the mass of the mask base material before immersion in water, S0Representing the maximum amount of water that can be absorbed per mass of the facial film substrate. The liquid absorption amount of the mask base material is an important index of the consideration of mask materials, directly influences the amount of essence absorbed by the mask and is an important guarantee for skin to absorb nutrition.
The water retention is that the liquid absorption S of the facial mask base material is tested at the ambient temperature of 25 ℃ and the relative humidity of 60 percent in a standard atmospheric pressure environment at a certain time intervalt，(St＝(mt-m0)/m0，mtMass of mask base material at t time) is represented by St/S0The calculated value shows the retention rate of the water absorption capacity along with the change of the time, and the higher the percentage value is, the better the water retention property is. The water retention is an important index of consideration of mask materials, and when a person uses the mask, the mask is generally kept attached to the face for more than half an hour, and if water is quickly lost, the effect of the mask is greatly reduced. Therefore, excellent water absorption and water retention are both required properties of the mask material. The mask material prepared by the invention has excellent water absorption and water retention, and the results are shown in the following table 2:
TABLE 2
Figure BDA0002698267350000081
Application example 3Evaluation of air permeability and moisture permeability
With reference to GB/T24218-2018-non-woven fabric air permeability test standard, the air permeability of the lower membrane substrate in a dry state is tested by using a YG461E type full-automatic fabric air permeability instrument; the water vapor transmission rate was tested using a W3/060 water vapor transmission rate test system with reference to YY/T0471.2, the test conditions were set at 36 ℃ and a relative humidity of 90 RH%, and the results are shown in Table 3 below:
TABLE 3
Figure BDA0002698267350000082
Figure BDA0002698267350000091
Good breathability is one indicator of mask comfort. The basal layer cells of the skin need to absorb oxygen for metabolism, and the mask base cloth with good ventilation can ensure that the skin is normally contacted with the oxygen. When people use the facial mask, the facial mask with the essence is applied to the face for a period of time, the facial mask essence is gradually evaporated along with the time while being absorbed by the skin, and the facial mask base cloth with better water locking performance can reduce the evaporation of the facial mask essence, so that the facial mask essence stays on the face for a longer time, and a greater effect is achieved. However, the mask base material also needs a certain moisture permeability to make the user feel comfortable. Air and moisture permeability depends on the number of voids between the fibers, the nature and structure of the fibers. The composite face film substrate with a three-layer structure is prepared by selecting a proper fiber material according to a specific process. The mask base material has the advantages of one-way water guiding, excellent water absorption and retention performance, good air permeability and proper moisture permeability, and ensures the comfort and the function of the mask base material as mask base cloth to the skin.
Application example 4Evaluation of flexibility and comfort
Because the human face is rugged and three-dimensional, the mask base material needs to have lower bending performance and better softness, so that the mask can be tightly attached to the human face in a wet state, and meanwhile, the comfort level of the human body needs to be considered. The mask substrate obtained in the examples of the present invention was subjected to the bending stiffness test, and the results are shown in table 4 below:
TABLE 4
Figure BDA0002698267350000092
As can be seen from the data in table 4, the bending stiffness of the mask substrate prepared in the embodiment of the present invention in the wet state is much lower than that in the wet state, which indicates that the mask substrate provided by the present invention can maintain stiffness in the dry state, can sufficiently fit with a human face in the wet state, and is soft and comfortable.

Claims (10)

1. A one-way water guide mask base material is of a three-layer structure, wherein the upper layer is hydrophobic modified polyester fiber, the middle layer is chitosan modified polyvinyl alcohol fiber, and the lower layer is viscose fiber; and after the hydrophobic modified polyester fiber, the chitosan modified polyvinyl alcohol fiber and the viscose fiber are combed into a net and compounded, the composite material is obtained by spunlacing reinforcement.
2. The mask substrate of claim 1, wherein said compounding is of two fibers at 30-60 °.
3. The mask substrate of claim 2, wherein the hydrophobically modified polyester fiber web and the chitosan modified polyvinyl alcohol fiber web are 30 ° ± 5 ° composite, and the chitosan modified polyvinyl alcohol fiber web and the viscose fiber web are 45 ° ± 5 ° composite.
4. The mask substrate of claim 1, wherein the hydrophobically modified polyester fiber is prepared by the steps of: carrying out prepolymerization and polycondensation on terephthalic acid, butanediol and castor oil modified polyol to obtain polyester; polyester and polyethylene glycol are subjected to melt extrusion granulation to obtain master batches; and carrying out melt spinning, cooling, drafting and winding to prepare the hydrophobic modified polyester fiber.
5. The mask substrate of claim 4, wherein the castor oil-modified polyol has a hydroxyl number of 50-80mg KOH/g, an acid number of 0.1-0.6mg KOH/g, a number average molecular weight of 2000-; and/or
The molar ratio of terephthalic acid to butanediol to the castor oil modified polyol is 110-: 100-120:5-10.
6. The mask substrate according to claim 4, wherein the weight ratio of the polyester chip to the polyethylene glycol is 100: 5-10, and the number average molecular weight of the polyethylene glycol is 400-600.
7. The mask substrate of claim 1, wherein the chitosan-modified polyvinyl alcohol fibers are prepared by a method comprising: soaking polyvinyl alcohol fiber in acetic acid solution of chitosan, and drying; preferably, in the acetic acid solution of chitosan, the concentration of chitosan is 3-5 wt%, and the concentration of acetic acid is 5-10 wt%; the dipping time is 3-5 h.
8. The mask substrate according to claim 1, wherein in the step of carding, the hydrophobically modified polyester fiber has an areal density of 20 to 25g/m after carding2The surface density of the chitosan modified polyvinyl alcohol fiber after being carded is 15 to 20g/m2The surface density of the viscose fiber obtained after carding is 10-15g/m2(ii) a Preferably, after the three fibers are carded, the surface density is decreased in the order of the hydrophobic modified polyester fiber net, the chitosan modified polyvinyl alcohol fiber net and the viscose fiber net.
9. The mask substrate according to claim 1, wherein the process conditions of the hydroentangling are that the chitosan modified polyvinyl alcohol fiber layer is pre-wetted by a hydroentangling machine and then is subjected to 3-5 times of hydroentangling;
preferably, the pre-wetted hydroentangling water pressure is 1.5-2.0 MPa; the water pressure of the 3-5 water stabs is gradually increased and then gradually decreased; the water pressure of the first and last spunlace channels is 4.5-5MPa, and the water pressure of the intermediate channel is 6.5-9.5 MPa; further preferably, the action distance of the water needle stimulated by water is 12-20mm, preferably 14-16 mm; the net conveying roller shutter speed is 50-100m/s, preferably 70-90 m/s.
10. A method of making a unidirectional water directing mask substrate of any one of claims 1-9, comprising the steps of: the hydrophobic modified polyester fiber and the viscose fiber are obtained by opening, carding, forming a net, compounding, spunlacing, reinforcing, drying and curling respectively.
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