CN111235881A - Hydrophilic finishing method for ES fiber non-woven fabric of sanitary towel surface coating - Google Patents
Hydrophilic finishing method for ES fiber non-woven fabric of sanitary towel surface coating Download PDFInfo
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- CN111235881A CN111235881A CN202010185543.0A CN202010185543A CN111235881A CN 111235881 A CN111235881 A CN 111235881A CN 202010185543 A CN202010185543 A CN 202010185543A CN 111235881 A CN111235881 A CN 111235881A
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- 239000000835 fiber Substances 0.000 title claims abstract description 145
- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000000576 coating method Methods 0.000 title claims abstract description 27
- 239000011248 coating agent Substances 0.000 title claims description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 25
- 239000001257 hydrogen Substances 0.000 claims abstract description 25
- 150000002433 hydrophilic molecules Chemical class 0.000 claims abstract description 23
- 230000004048 modification Effects 0.000 claims abstract description 23
- 238000012986 modification Methods 0.000 claims abstract description 23
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 claims abstract description 22
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 31
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000007864 aqueous solution Substances 0.000 claims description 24
- 239000004744 fabric Substances 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 19
- 239000003999 initiator Substances 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 19
- 238000005406 washing Methods 0.000 claims description 16
- 238000002791 soaking Methods 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 14
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 claims description 10
- VIOMIGLBMQVNLY-UHFFFAOYSA-N 4-[(4-amino-2-chloro-3,5-diethylphenyl)methyl]-3-chloro-2,6-diethylaniline Chemical compound CCC1=C(N)C(CC)=CC(CC=2C(=C(CC)C(N)=C(CC)C=2)Cl)=C1Cl VIOMIGLBMQVNLY-UHFFFAOYSA-N 0.000 claims description 10
- 230000001678 irradiating effect Effects 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 150000003573 thiols Chemical class 0.000 claims description 7
- IYVLMMUENZSXFK-UHFFFAOYSA-N ethanol;hydrate;hydrochloride Chemical compound O.Cl.CCO IYVLMMUENZSXFK-UHFFFAOYSA-N 0.000 claims description 6
- DZGCGKFAPXFTNM-UHFFFAOYSA-N ethanol;hydron;chloride Chemical compound Cl.CCO DZGCGKFAPXFTNM-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- XORPFVDIGIRKGM-UHFFFAOYSA-N [K].CCCOC(=O)C(C)=C Chemical compound [K].CCCOC(=O)C(C)=C XORPFVDIGIRKGM-UHFFFAOYSA-N 0.000 claims 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims 1
- 239000003513 alkali Substances 0.000 abstract description 9
- 239000002345 surface coating layer Substances 0.000 abstract description 3
- OXBLVCZKDOZZOJ-UHFFFAOYSA-N 2,3-Dihydrothiophene Chemical compound C1CC=CS1 OXBLVCZKDOZZOJ-UHFFFAOYSA-N 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 18
- 230000035515 penetration Effects 0.000 description 14
- 239000010410 layer Substances 0.000 description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 239000002250 absorbent Substances 0.000 description 8
- 230000002745 absorbent Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000004094 surface-active agent Substances 0.000 description 7
- 229910019142 PO4 Inorganic materials 0.000 description 6
- 229910008051 Si-OH Inorganic materials 0.000 description 6
- 229910006358 Si—OH Inorganic materials 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 239000001818 polyoxyethylene sorbitan monostearate Substances 0.000 description 6
- 235000010989 polyoxyethylene sorbitan monostearate Nutrition 0.000 description 6
- 238000001223 reverse osmosis Methods 0.000 description 6
- GOYGDRZICQPIBA-UHFFFAOYSA-N 2-methyl-3-oxo-3-propoxyprop-1-ene-1-sulfonic acid Chemical compound CCCOC(=O)C(C)=CS(O)(=O)=O GOYGDRZICQPIBA-UHFFFAOYSA-N 0.000 description 5
- 239000004900 Hydrophilic Finishing Agent Substances 0.000 description 5
- 239000004721 Polyphenylene oxide Substances 0.000 description 5
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 229920000570 polyether Polymers 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000001103 potassium chloride Substances 0.000 description 5
- 235000011164 potassium chloride Nutrition 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 229920002545 silicone oil Polymers 0.000 description 5
- 125000003396 thiol group Chemical group [H]S* 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 125000005233 alkylalcohol group Chemical group 0.000 description 4
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 4
- 125000000524 functional group Chemical group 0.000 description 4
- 239000002736 nonionic surfactant Substances 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 239000010452 phosphate Substances 0.000 description 4
- 229920000056 polyoxyethylene ether Polymers 0.000 description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004043 dyeing Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- PNOXUQIZPBURMT-UHFFFAOYSA-M potassium;3-(2-methylprop-2-enoyloxy)propane-1-sulfonate Chemical compound [K+].CC(=C)C(=O)OCCCS([O-])(=O)=O PNOXUQIZPBURMT-UHFFFAOYSA-M 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- 239000004753 textile Substances 0.000 description 3
- 229920001214 Polysorbate 60 Polymers 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 125000001165 hydrophobic group Chemical group 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002715 modification method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 210000004243 sweat Anatomy 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 210000002700 urine Anatomy 0.000 description 2
- XGDRLCRGKUCBQL-UHFFFAOYSA-N 1h-imidazole-4,5-dicarbonitrile Chemical compound N#CC=1N=CNC=1C#N XGDRLCRGKUCBQL-UHFFFAOYSA-N 0.000 description 1
- CGORERCPVAYUAZ-UHFFFAOYSA-N P(=O)(O)(O)O.C(CCCCCCCCCCC)[K] Chemical compound P(=O)(O)(O)O.C(CCCCCCCCCCC)[K] CGORERCPVAYUAZ-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002979 fabric softener Substances 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002504 physiological saline solution Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- 238000009988 textile finishing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/244—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus
- D06M13/248—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus with compounds containing sulfur
- D06M13/256—Sulfonated compounds esters thereof, e.g. sultones
-
- 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
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
-
- 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
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/50—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with organometallic compounds; with organic compounds containing boron, silicon, selenium or tellurium atoms
- D06M13/51—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond
- D06M13/513—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond with at least one carbon-silicon bond
-
- 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
- D06M2101/20—Polyalkenes, polymers or copolymers of compounds with alkenyl groups bonded to aromatic groups
-
- 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
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/10—Repellency against liquids
- D06M2200/11—Oleophobic properties
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention discloses a hydrophilic finishing method for ES fiber non-woven fabrics of sanitary towel surface coatings, which is characterized in that the ES fiber non-woven fabrics are subjected to alkali treatment, 3-mercaptopropyltrimethoxysilane is used for realizing the sulfydryl modification of fibers, and thiol-ene click chemistry is used for grafting hydrophilic compounds of hydrogen sulfonic groups, so that the hydrophilic finishing of the ES fiber non-woven fabrics is realized. Compared with the prior art, the ES fiber non-woven fabric is subjected to surface grafting modification, so that the ES fiber non-woven fabric is stable in hydrophilic performance and excellent in multiple hydrophilic performance, can meet the high requirement of a disposable sanitary product on durability, and solves the problem of multiple hydrophilic performance of a sanitary towel surface coating layer.
Description
Technical Field
The invention particularly relates to a hydrophilic finishing method of ES fiber non-woven fabric of a sanitary towel surface coating layer.
Background
Currently, sanitary napkins for feminine hygiene are generally comprised of a cover layer, a flow directing layer, an absorbent core layer, and an isolation layer. The covering layer of the sanitary towel is made of non-woven fabric and is a key part of the sanitary product. The action of the covering layer is divided into two aspects: firstly, when liquid is discharged, the liquid can be quickly absorbed by the coating layer and enters the absorption layer, so that the skin is ensured to be clean and dry; secondly, when the liquid absorbed by the absorption layer is under a certain pressure, the liquid can not easily permeate back to the coating layer, and the coating layer needs to have the function of keeping dry and comfortable.
The ES fiber is called "Ethylene-Propylene Side By Side" in all English, is a novel thermal bonding polyolefin fiber developed By Chisso corporation of Japan, and has been highly evaluated in the world. The ES non-woven fabric is prepared by heating and melting PE (polyethylene) and PP (polypropylene) polymers at high temperature, extruding the polymers from spinning holes, cooling the polymers in air, stretching and thinning the polymers at a certain speed to form filaments with a sheath-core structure from polymer melts, and then processing the filaments by hot air and other methods. The prepared ES fiber non-woven fabric has the characteristics of fluffiness, softness and good strength, and is adopted as a facing material of a sanitary towel in adult diapers such as American P & G, Kimbcrly-Clark, Japan Youyijia, China Henan et al. Although the prior ES fiber non-woven fabric meets the requirements of the facing material of the sanitary product in terms of physical properties, the ES fiber non-woven fabric has poor hydrophilicity. Because polypropylene and polyethylene fibers lack hydrophilic groups, in order to enable the PE/PP (ethylene propylene) fiber (ES) non-woven fabric to meet the requirements of the facing material of the sanitary towel, hydrophilic finishing is needed on the ES fiber non-woven fabric.
In the prior art, two main hydrophilic modification methods for ES fiber non-woven fabrics are provided: one is to modify the fiber in the spinning process, and the other is to modify the spinning, namely to modify the fiber body; the other is modification in the finishing process of the non-woven fabric, and the surface layer of the non-woven fabric is finished and modified. At present, the most commonly used hydrophilic modification method for the ES fiber non-woven fabric mainly adopts fiber surface hydrophilization treatment, namely, a layer of hydrophilic compound-hydrophilic finishing agent (surfactant) is added on the fiber surface, but the surfactant in the hydrophilic finishing agent solution is adsorbed on an ES fiber interface mainly by virtue of intermolecular force and electrostatic action, and the surfactant solution is absorbed along with the solution after multiple times of hydrophilic action, so that the problems of insufficient hydrophilic ability and insufficient hydrophilic durability exist; the disposable sanitary product has high requirement on durability, such as good water permeability, and the 5 th hydrophilic time is less than 3 s. Therefore, there is a need to develop a hydrophilic finishing method for ES fiber nonwoven fabric with stable hydrophilicity, which solves the multiple hydrophilic property of the surface coating of the sanitary towel.
The surface hydrophilic grafting modification of the ES fiber non-woven fabric is realized by performing alkali treatment on the ES fiber non-woven fabric, performing sulfhydrylation modification, and then grafting a hydrophilic compound of a hydrogen sulfonic group through an initiator under the action of ultraviolet rays. According to the hydrophilic finishing method, the hydrophilic compound of the hydrogen sulfonic group is grafted to the surface of the fabric by adopting mercaptan-alkene click chemistry, the acting force is strong, the hydrophilic capability of the fabric can be stably maintained, and the requirement that the fifth hydrophilic time is less than 3s is met.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the technical problem to be solved by the invention is to improve the hydrophilic performance of the ES fiber nonwoven fabric of the surface coating layer of the sanitary towel.
In order to achieve the aim, the invention provides a hydrophilic finishing method of ES fiber non-woven fabric of a sanitary towel surface coating, which comprises the following steps:
s1 pretreatment: immersing the ES fiber non-woven fabric into a sodium hydroxide aqueous solution, cleaning and drying to obtain a pretreated ES fiber non-woven fabric;
s2 sulfhydrylation modification: immersing the ES fiber non-woven fabric pretreated in the step S1 into a sulfydryl modified liquid, fishing out the ES fiber non-woven fabric, controlling the liquid content to be 60-90 wt%, and then curing at 110-130 ℃ to obtain a sulfydryl modified ES fiber non-woven fabric;
s3 hydrophilic finishing: immersing the mercapto-modified ES fiber non-woven fabric prepared in the step S2 into the grafting finishing liquid, and irradiating one side of the mercapto-modified ES fiber non-woven fabric with ultraviolet rays; and then washing with water and drying.
Further preferably, the hydrophilic finishing method of the ES fiber non-woven fabric for the surface coating of the sanitary towel comprises the following steps:
s1 pretreatment
Adding the ES fiber non-woven fabric into a sodium hydroxide aqueous solution with the molar concentration of 3-6 mol/L for soaking for 20-40 min according to the bath ratio of 1 (5-10) (v/v); washing the ES fiber non-woven fabric with water until the pH value of the fabric surface is 7; drying at 60-90 ℃ for 8-20 h to obtain the pretreated ES fiber non-woven fabric;
s2 thiol modification
Adding the ES fiber non-woven fabric pretreated in the step S1 into a sulfydryl modified liquid according to a bath ratio of 1 (5-10) (v/v), soaking for 20-40 min at 10-35 ℃, taking out the ES fiber non-woven fabric, controlling the liquid content to be 60-90 wt%, and then curing for 5-10 min at 110-130 ℃ to obtain a sulfydryl modified ES fiber non-woven fabric; the mercapto-modified liquid is prepared by adding 3-mercaptopropyltrimethoxysilane into an ethanol aqueous solution of hydrochloric acid, and stirring and mixing for 20-40 min at 10-35 ℃; the amount of the 3-mercaptopropyl-trimethoxysilane is 2-4 wt% of the ethanol hydrochloride aqueous solution;
the functional group Si-OCH of the 3-Mercaptopropyltrimethoxysilane (MTS) in the acidic condition3Hydrolysis is carried out to obtain Si-OH functional groups, and then the functional groups are dehydrated and condensed to form oligomeric siloxane containing Si-OH; the-OH on the surface of the fabric is fully contacted with the oligomeric siloxane containing Si-OH to form hydrogen bonds. Moreover, the hydrolyzed 3-mercaptopropyltrimethoxysilane is cured at high temperature to form a stable covalent bond, so that the surface of the ES fiber non-woven fabric is rich in sulfydryl;
s3 hydrophilic finishing:
immersing the sulfhydryl-modified ES fiber non-woven fabric prepared in the step S2 into the grafting finishing liquid according to the bath ratio of 1 (3-6) (v/v), and irradiating one side of the sulfhydryl-modified ES fiber non-woven fabric with ultraviolet rays with the wavelength of 10-400 nm for 40-80 min; and then washing with water and drying.
Preferably, the ethanol hydrochloride aqueous solution is prepared by adding 70-90 mL of absolute ethanol into 10-30 mL of 0.1mol/L diluted hydrochloric acid and uniformly mixing.
Preferably, the grafting finishing liquid consists of 8-12 wt% of hydrophilic compound with hydrogen sulfonic group, 0.5-1.5 wt% of initiator and the balance of water.
Preferably, the hydrophilic compound of the hydrogen sulfonic acid group is 3-sulfopropyl methacrylate potassium salt.
Preferably, the initiator is any one of 2, 2-dimethylolpropionic acid, 2-dimethylolbutyric acid and 4,4' -methylenebis (3-chloro-2, 6-diethylaniline) or a mixture of two of the two; more preferably, the initiator is a mixture of 2, 2-dimethylolpropionic acid and 4,4' -methylenebis (3-chloro-2, 6-diethylaniline) according to a mass ratio of (1-3): 1.
Under the irradiation of single-sided ultraviolet rays, the hydrophilic compound of the hydrogen sulfonic group is grafted to the surface of the ES fiber non-woven fabric with the surface being rich in the sulfydryl through mercaptan-alkene click chemistry, so that the hydrophilic finishing of the ES fiber non-woven fabric is realized, the high requirement of disposable sanitary products on durability can be met, and the multiple hydrophilic performance of the surface coating of the sanitary towel is solved.
The invention also discloses a single-sided hydrophilic ES fiber non-woven fabric for the surface coating of the sanitary towel, which is prepared by adopting the hydrophilic finishing method for the ES fiber non-woven fabric for the surface coating of the sanitary towel.
The invention has the beneficial effects that:
compared with the prior art, the surface hydrophilic grafting modification of the ES fiber non-woven fabric is realized by performing alkali treatment on the ES fiber non-woven fabric, performing sulfhydrylation modification, and then grafting a hydrophilic compound of a hydrogen sulfonic group through an initiator under the action of ultraviolet rays. According to the hydrophilic finishing method, the hydrophilic compound of the hydrogen sulfonic group is grafted to the surface of the fabric by adopting mercaptan-alkene click chemistry, the acting force is strong, the hydrophilic capability of the fabric can be stably maintained, and the requirement that the fifth hydrophilic time is less than 3s is met.
Detailed Description
The specific parameters of each substance in the embodiment of the invention are as follows:
20-25g/cm of ES fiber non-woven fabric2Changzhou Xinan non-woven fabrics Co., Ltd; the ES fiber non-woven fabric used in the embodiment of the invention is specially customized, and is not subjected to hydrophilic finishing before leaving a factory.
The polyether silicone oil adopted in the comparison example is JF-804Y hydrophilic polyether silicone oil, model JF-804Y; CAS number: 68937-55-3, brand: south of the Yangtze river; has excellent fluffiness and hydrophilicity, and can be used as raw materials of fabric softeners, fluffing agents, moisture absorption and sweat releasing finishing agents, antistatic agents and the like. The finishing agent is commonly used on fabrics, so that the fabrics have excellent hydrophilicity, the antistatic property and the hydrophilic property of fibers, yarns and fabrics treated by the finishing agent are greatly improved, and the fabrics treated by the finishing agent are not easy to pilling and have good bulkiness and better softness; the re-dyeing performance is good, and meanwhile, various chemical fiber fabrics with small moisture regain have better serviceability; is widely used for various hydrophilic softening agents.
The potassium salt of alkyl alcohol ether phosphate adopted in the comparison example of the invention is lauryl potassium phosphate MA24PK-50, which is sourced from Haian petrochemical plants in Jiangsu provinceThe companies Limited; being anionic surfactants, the hydrophobic groups binding to the hydrophobic matrix during hydrophilic finishing, -PO4K2Being a strong hydrophilic group, it readily binds water, reduces the contact angle of water on the fiber surface and accelerates the spreading of water.
The fatty alcohol-polyoxyethylene ether adopted in the comparative example of the invention has CAS number: 68439-50-9, model MOA-7, sourced from Haian petrochemical plant, Inc., Jiangsu province; the surfactant is a nonionic surfactant, has high stability, good water solubility, electrolyte resistance, easy biodegradation and small foam, and is widely used in the textile printing and dyeing industry.
Polyoxyethylene sorbitan monostearate, tween 60, type T-60, sourced from haian petrochemical plant ltd, Jiangsu province; the nonionic surfactant has a relatively high hydrophilicity due to the presence of a relatively large amount of polyoxyethylene, which is a hydrophilic group, in the molecule.
3-mercaptopropyltrimethoxysilane, CAS number 4420-74-0, molecular formula: c6H16O3SSi。
3-sulfopropyl methacrylate potassium salt, CAS number 31098-21-2, molecular formula: c7H12KO5S。
2, 2-dimethylolpropionic acid, CAS number 4767-03-7, molecular formula: c5H10O4。
4,4' -methylenebis (3-chloro-2, 6-diethylaniline), CAS number: 106246-33-7, formula: c21H28Cl2N2。
Comparative example 1 (prior art)
A hydrophilic finishing method for ES fiber non-woven fabrics of sanitary towel surface coatings comprises the following steps: 3, soaking the ES fiber non-woven fabric in a hydrophilic finishing agent with the concentration of 8g/L for 60min at the temperature of 60 ℃, fishing out, controlling the liquid content to be 80%, and drying in a hot air oven for 3min at the temperature of 100 ℃ to obtain the fabric; the mass ratio of polyether silicone oil, potassium alkyl alcohol ether phosphate, fatty alcohol-polyoxyethylene ether and polyoxyethylene sorbitan monostearate in the hydrophilic finishing agent is 10:30:20: 3.
The polyether silicone oil has the characteristics of water absorption, sweat absorption, softness and the like, has the effects of stain resistance and static resistance, and is a multifunctional textile finishing agent;
potassium alkyl alcohol ether phosphate, anionic surfactant, hydrophobic group bound to hydrophobic matrix during hydrophilic finishing, -PO4K2Being a strong hydrophilic group, it readily binds water, reduces the contact angle of water on the fiber surface and accelerates the spreading of water.
The fatty alcohol-polyoxyethylene ether and the nonionic surfactant have the advantages of high stability, good water solubility, electrolyte resistance, easy biodegradation, small foam and large-scale use in the textile printing and dyeing industry.
Polyoxyethylene sorbitan monostearate, Tween 60 and a nonionic surfactant, wherein the molecules of the polyoxyethylene sorbitan monostearate have more hydrophilic groups, namely polyoxyethylene groups, so that the polyoxyethylene sorbitan monostearate has stronger hydrophilicity.
Example 1
A hydrophilic finishing method for ES fiber non-woven fabrics of sanitary towel surface coatings comprises the following steps:
s1 pretreatment
Adding the ES fiber non-woven fabric into a sodium hydroxide aqueous solution with the molar concentration of 5mol/L for soaking for 30min according to the bath ratio of 1:8 (v/v); washing the ES fiber non-woven fabric with a large amount of water until the pH value of the fabric surface is 7; then drying at 80 ℃ for 12h to obtain the pretreated ES fiber non-woven fabric; the ES fiber non-woven fabric is subjected to alkali treatment, and certain hydroxyl groups are generated on the surface;
s2 thiol modification
Adding the ES fiber non-woven fabric pretreated in the step S1 into a sulfydryl modified liquid according to a bath ratio of 1:8(v/v), soaking for 30min at 25 ℃, taking out the ES fiber non-woven fabric, controlling the liquid content to be 80 wt%, and then curing for 6min at 120 ℃ to obtain a sulfydryl modified ES fiber non-woven fabric;
the sulfhydryl modification liquid is prepared by adding 3-mercaptopropyltrimethoxysilane into an ethanol aqueous solution of hydrochloric acid, stirring and mixing for 30min at 25 ℃; the dosage of the 3-mercaptopropyltrimethoxysilane is 3 wt% of the ethanol aqueous solution of hydrochloric acid; the hydrochloric acid ethanol water solution is prepared by adding 85mL of absolute ethanol into 15mL of 0.1mol/L diluted hydrochloric acid and uniformly mixing;
s3 hydrophilic finish
Immersing the sulfhydryl-modified ES fiber non-woven fabric prepared in the step S2 into the grafting finishing liquid according to the bath ratio of 1:3(v/v), and irradiating one side of the sulfhydryl-modified ES fiber non-woven fabric with ultraviolet rays with the wavelength of 365nm for 60 min; then washing with water, and drying in a hot air oven at 80 deg.C for 10 min; the grafting finishing liquid is prepared by uniformly mixing 10 wt% of hydrophilic compound with hydrogen sulfonic group, 1.0 wt% of initiator and the balance of water; the hydrophilic compound of the hydrogen sulfonic group is 3-propyl sulfomethacrylate sylvite; the initiator is 2, 2-dimethylolpropionic acid.
The 3-Mercaptopropyltrimethoxysilane (MTS) of the invention is Si-OCH under acidic condition3Hydrolyzing to obtain Si-OH functional groups, and then dehydrating and condensing to form oligomeric siloxane containing Si-OH; and (3) fully contacting-OH on the surface of the fabric with oligomeric siloxane containing Si-OH to form hydrogen bonds, and finally curing at high temperature to form stable covalent bonds so as to realize that the surface of the ES fiber non-woven fabric is rich in sulfydryl. And finally, grafting a hydrophilic compound of a hydrogen sulfonic group by mercaptan-alkene click chemistry under the irradiation of single-side ultraviolet rays to realize hydrophilic finishing of the ES fiber non-woven fabric.
Example 2
A hydrophilic finishing method for ES fiber non-woven fabrics of sanitary towel surface coatings comprises the following steps:
s1 pretreatment
Adding the ES fiber non-woven fabric into a sodium hydroxide aqueous solution with the molar concentration of 5mol/L for soaking for 30min according to the bath ratio of 1:8 (v/v); washing the ES fiber non-woven fabric with a large amount of water until the pH value of the fabric surface is 7; then drying at 80 ℃ for 12h to obtain the pretreated ES fiber non-woven fabric; the ES fiber non-woven fabric is subjected to alkali treatment, and certain hydroxyl groups are generated on the surface;
s2 thiol modification
Adding the ES fiber non-woven fabric pretreated in the step S1 into a sulfydryl modified liquid according to a bath ratio of 1:8(v/v), soaking for 30min at 25 ℃, taking out the ES fiber non-woven fabric, controlling the liquid content to be 80 wt%, and then curing for 6min at 120 ℃ to obtain a sulfydryl modified ES fiber non-woven fabric;
the sulfhydryl modification liquid is prepared by adding 3-mercaptopropyltrimethoxysilane into an ethanol aqueous solution of hydrochloric acid, stirring and mixing for 30min at 25 ℃; the dosage of the 3-mercaptopropyltrimethoxysilane is 3 wt% of the ethanol aqueous solution of hydrochloric acid; the hydrochloric acid ethanol water solution is prepared by adding 85mL of absolute ethanol into 15mL of 0.1mol/L diluted hydrochloric acid and uniformly mixing;
s3 hydrophilic finish
Immersing the sulfhydryl-modified ES fiber non-woven fabric prepared in the step S2 into the grafting finishing liquid according to the bath ratio of 1:3(v/v), and irradiating one side of the sulfhydryl-modified ES fiber non-woven fabric with ultraviolet rays with the wavelength of 365nm for 60 min; then washing with water, and drying in a hot air oven at 80 deg.C for 10 min.
The grafting finishing liquid is prepared by uniformly mixing 10 wt% of hydrophilic compound with hydrogen sulfonic group, 1.0 wt% of initiator and the balance of water; the hydrophilic compound of the hydrogen sulfonic group is 3-propyl sulfomethacrylate sylvite; the initiator is 4,4' -methylene bis (3-chloro-2, 6-diethylaniline).
Example 3
A hydrophilic finishing method for ES fiber non-woven fabrics of sanitary towel surface coatings comprises the following steps:
s1 pretreatment
Adding the ES fiber non-woven fabric into a sodium hydroxide aqueous solution with the molar concentration of 5mol/L for soaking for 30min according to the bath ratio of 1:8 (v/v); washing the ES fiber non-woven fabric with a large amount of water until the pH value of the fabric surface is 7; then drying at 80 ℃ for 12h to obtain the pretreated ES fiber non-woven fabric; the ES fiber non-woven fabric is subjected to alkali treatment, and certain hydroxyl groups are generated on the surface;
s2 thiol modification
Adding the ES fiber non-woven fabric pretreated in the step S1 into a sulfydryl modified liquid according to a bath ratio of 1:8(v/v), soaking for 30min at 25 ℃, taking out the ES fiber non-woven fabric, controlling the liquid content to be 80 wt%, and then curing for 6min at 120 ℃ to obtain a sulfydryl modified ES fiber non-woven fabric;
the sulfhydryl modification liquid is prepared by adding 3-mercaptopropyltrimethoxysilane into an ethanol aqueous solution of hydrochloric acid, stirring and mixing for 30min at 25 ℃; the dosage of the 3-mercaptopropyltrimethoxysilane is 3 wt% of the ethanol aqueous solution of hydrochloric acid; the hydrochloric acid ethanol water solution is prepared by adding 85mL of absolute ethanol into 15mL of 0.1mol/L diluted hydrochloric acid and uniformly mixing;
s3 hydrophilic finish
Immersing the sulfhydryl-modified ES fiber non-woven fabric prepared in the step S2 into the grafting finishing liquid according to the bath ratio of 1:3(v/v), and irradiating one side of the sulfhydryl-modified ES fiber non-woven fabric with ultraviolet rays with the wavelength of 365nm for 60 min; then washing with water, and drying in a hot air oven at 80 deg.C for 10 min.
The grafting finishing liquid is prepared by uniformly mixing 10 wt% of hydrophilic compound with hydrogen sulfonic group, 1.0 wt% of initiator and the balance of water; the hydrophilic compound of the hydrogen sulfonic group is 3-propyl sulfomethacrylate sylvite; the initiator is a mixture of 2, 2-dimethylolpropionic acid and 4,4' -methylenebis (3-chloro-2, 6-diethylaniline) according to a mass ratio of 2: 1.
Example 4
A hydrophilic finishing method for ES fiber non-woven fabrics of sanitary towel surface coatings comprises the following steps:
s1 pretreatment
Adding the ES fiber non-woven fabric into a sodium hydroxide aqueous solution with the molar concentration of 4mol/L for soaking for 20min according to the bath ratio of 1:5 (v/v); washing the ES fiber non-woven fabric with a large amount of water until the pH value of the fabric surface is 7; then drying for 8h at 90 ℃ to obtain the pretreated ES fiber non-woven fabric; the ES fiber non-woven fabric is subjected to alkali treatment, and certain hydroxyl groups are generated on the surface;
s2 thiol modification
Adding the ES fiber non-woven fabric pretreated in the step S1 into a sulfydryl modified liquid according to a bath ratio of 1:5(v/v), soaking for 20min at 25 ℃, taking out the ES fiber non-woven fabric, controlling the liquid content to be 90 wt%, and then curing for 5min at 130 ℃ to obtain a sulfydryl modified ES fiber non-woven fabric;
the sulfhydryl modification liquid is prepared by adding 3-mercaptopropyltrimethoxysilane into an ethanol aqueous solution of hydrochloric acid, stirring and mixing for 30min at 25 ℃; the dosage of the 3-mercaptopropyltrimethoxysilane is 3 wt% of the ethanol aqueous solution of hydrochloric acid; the hydrochloric acid ethanol water solution is prepared by adding 85mL of absolute ethanol into 15mL of 0.1mol/L diluted hydrochloric acid and uniformly mixing;
s3 hydrophilic finish
Immersing the sulfhydryl-modified ES fiber non-woven fabric prepared in the step S2 into the grafting finishing liquid according to the bath ratio of 1:5(v/v), and irradiating one side of the sulfhydryl-modified ES fiber non-woven fabric with ultraviolet rays with the wavelength of 365nm for 50 min; then washing with water, and drying in a hot air oven at 80 deg.C for 20 min.
The grafting finishing liquid is prepared by uniformly mixing 10 wt% of hydrophilic compound with hydrogen sulfonic group, 1.0 wt% of initiator and the balance of water; the hydrophilic compound of the hydrogen sulfonic group is 3-propyl sulfomethacrylate sylvite; the initiator is a mixture of 2, 2-dimethylolpropionic acid and 4,4' -methylenebis (3-chloro-2, 6-diethylaniline) according to a mass ratio of 2: 1.
Example 5
A hydrophilic finishing method for ES fiber non-woven fabrics of sanitary towel surface coatings comprises the following steps:
s1 pretreatment
Adding the ES fiber non-woven fabric into a sodium hydroxide aqueous solution with the molar concentration of 6mol/L for soaking for 40min according to the bath ratio of 1:10 (v/v); washing the ES fiber non-woven fabric with a large amount of water until the pH value of the fabric surface is 7; then drying the fabric at 60 ℃ for 20h to obtain pretreated ES fiber non-woven fabric; the ES fiber non-woven fabric is subjected to alkali treatment, and certain hydroxyl groups are generated on the surface;
s2 thiol modification
Adding the ES fiber non-woven fabric pretreated in the step S1 into a sulfydryl modified liquid according to a bath ratio of 1:10(v/v), soaking for 25min at 35 ℃, taking out the ES fiber non-woven fabric, controlling the liquid content to be 70 wt%, and then curing for 10min at 110 ℃ to obtain a sulfydryl modified ES fiber non-woven fabric;
the sulfhydryl modification liquid is prepared by adding 3-mercaptopropyltrimethoxysilane into an ethanol aqueous solution of hydrochloric acid, stirring and mixing for 30min at 25 ℃; the dosage of the 3-mercaptopropyltrimethoxysilane is 3 wt% of the ethanol aqueous solution of hydrochloric acid; the hydrochloric acid ethanol water solution is prepared by adding 85mL of absolute ethanol into 15mL of 0.1mol/L diluted hydrochloric acid and uniformly mixing;
s3 hydrophilic finish
Immersing the sulfhydryl-modified ES fiber non-woven fabric prepared in the step S2 into the grafting finishing liquid according to the bath ratio of 1:5(v/v), and irradiating one side of the sulfhydryl-modified ES fiber non-woven fabric with ultraviolet rays with the wavelength of 365nm for 70 min; then washing with water, and drying in a hot air oven at 80 deg.C for 20 min.
The grafting finishing liquid is prepared by uniformly mixing 10 wt% of hydrophilic compound with hydrogen sulfonic group, 1.0 wt% of initiator and the balance of water; the hydrophilic compound of the hydrogen sulfonic group is 3-propyl sulfomethacrylate sylvite; the initiator is a mixture of 2, 2-dimethylolpropionic acid and 4,4' -methylenebis (3-chloro-2, 6-diethylaniline) according to a mass ratio of 2: 1.
Test example 1
Hydrophilicity test
The standard adopted by the test is a test according to GB/T6504 and 2008 standard; the water permeability of the non-woven fabric is measured by penetration time, an instrument adopted in the experimental test is Austria LISTER AC, and the fifth penetration time is tested according to GB/T24218.13 standard. By liquid penetration time is meant the time required for a certain amount of liquid to penetrate a nonwoven laid on a dry standard absorbent pad.
Materials and reagents
(1) The super absorbent filter paper consists of 10 pieces of super absorbent filter paper with the light surface facing upwards, and the specification of the super absorbent filter paper is 100mm multiplied by 100 mm;
(2) simulated urine, which is 9g/L NaCl solution, its gammaSurface tension＝(70±2)mN/m。
Penetration time testing step:
(1) clamping the funnel on the ring frame;
(2) preparing 10 pieces of filter paper, laminating the filter paper layers together, and taking the filter paper layers as a standard absorption pad with the test surface facing upwards;
(3) the standard pad was placed on the instrument substrate and the sample was placed on the filter paper. The test specimens were placed in the appropriate locations so that the direction of liquid flow during the test was consistent with the use of the nonwoven. For sanitary articles, for example, the nonwoven is placed with the skin-contacting side facing upward.
(4) The penetration disk was placed on the sample with its center overlapping the center of the sample. The center of the funnel is opposite to the center of the circular cavity of the penetration disc;
(5) adjusting the height of the funnel to enable the tip mouth of the funnel to be positioned at the position (45 +/-1) mm above the instrument substrate;
(6) adding 5.0mL of test solution into the funnel by using a pipette or a burette, opening an electromagnetic liquid discharge valve of the funnel, and discharging 5.0mL of liquid;
(7) recording the time displayed on the display;
(8) and when waiting for 60s, repeating the operation steps, measuring the penetration time of the second effluent liquid, repeating the operation steps five times, and respectively recording the corresponding penetration time.
TABLE 2 multiple hydrophilicities after hydrophilic finishing of ES fiber nonwoven fabrics
As can be seen from table 1, in embodiments 1 to 3 of the present invention, the ES fiber nonwoven fabric is subjected to alkali treatment, sulfhydrylation modification, and then the hydrophilic compound having a hydrogen sulfonic acid group is grafted by the initiator under the action of ultraviolet light, so that the obtained ES fiber nonwoven fabric has a multiple hydrophilic performance significantly superior to that of the ES fiber nonwoven fabric subjected to hydrophilic finishing by the surfactant compounded by polyether silicone oil, potassium alkyl alcohol ether phosphate, fatty alcohol polyoxyethylene ether, and polyoxyethylene sorbitan monostearate in the prior art. The reason for this is that: the surfactant in the hydrophilic finishing agent solution is adsorbed on an ES fiber interface mainly by virtue of intermolecular force and electrostatic action, and the surfactant solution is absorbed along with the solution after multiple hydrophilic actions, so that the multiple hydrophilic capacity is insufficient, and the high requirement of the disposable sanitary product on durability cannot be met; the hydrophilic finishing method grafts the hydrophilic compound of the hydrogen sulfonic group on the surface of the fabric through mercaptan-alkene click chemistry, has strong acting force, can stably maintain the hydrophilic capability of the fabric, and meets the requirement that the fifth hydrophilic time is less than 3 s.
Test example 2
Return penetration test
The reverse osmosis amount is a method for testing the surface coating material of the sanitary towel to resist the reverse wetting of the permeated liquid on the skin, when the reverse osmosis amount is larger, the liquid in the sanitary towel can be extruded, and the liquid is in direct contact with the skin, so that the skin is not dry and is irritated.
GB/T24218.14 textile nonwoven test method part 14: determination of the rewet amount of the cover material the test method for testing the resistance of the cover material of a nonwoven against rewet of penetrated liquids onto the skin is specified, which is based on the test of the liquid penetration time.
The ES nonwoven was placed on a standard absorbent pad (10-layer) filter paper and 3 liquid penetration tests were performed according to the method of GB/T24218.13 using the specified simulated urine volume. After the 3 rd penetration test, a stainless steel block simulating the load of the baby was placed over the coverstock and absorbent pad to allow even diffusion of the liquid.
A blotter paper of known mass was placed over the tested coverstock and the simulated baby payload piece was replaced on the blotter paper.
The mass of liquid absorbed by the absorbent paper is defined as the amount of rewet.
The testing steps are as follows:
(1)10 pieces of filter paper (100 mm. times.100 mm) were weighed, and the weight W was recorded1. Then placing the glass on a bottom plate with the smooth surface facing upwards;
(2) calculating the physiological saline water quantity Q to be 3.4 xW according to a formula1；
(3) Repeating the penetration experiment step for 3 times;
(4) continuously permeating Q1-15 ml normal saline into the nonwoven fabric subjected to the permeation experiment;
(5) the penetrating disk was carefully removed. Slightly pressing the mass simulating the load of the baby onto the filter paper, and starting timing after completely pressing;
(6) after waiting for 3min, taking the blocks away, and wiping the blocks dry;
(7) qualitative filter paper (125 mm. times.125 mm) is weighed, and the weight W is recorded2Put on the test sample, press rapidly with the thing piece;
(8) meterAfter 2min, remove the mass and weigh the qualitative filter paper3；
(9) Reverse osmosis capacity is W3-W2Generally, the reverse osmosis amount needs to be less than 0.3g, and the reverse osmosis amount of the surface layer material of the baby diaper is less than 0.13 g.
TABLE 2 Return penetration of ES fiber nonwoven after hydrophilic finishing
| Examples | Reverse osmosis amount/g |
| Comparative example 1 | 0.15 |
| Example 1 | 0.11 |
| Example 2 | 0.10 |
| Example 3 | 0.08 |
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A hydrophilic finishing method for ES fiber non-woven fabrics of sanitary towel surface coatings is characterized by comprising the following steps:
s1 pretreatment: immersing the ES fiber non-woven fabric into a sodium hydroxide aqueous solution, cleaning and drying to obtain a pretreated ES fiber non-woven fabric;
s2 sulfhydrylation modification: immersing the ES fiber non-woven fabric pretreated in the step S1 into a sulfydryl modified liquid, fishing out the ES fiber non-woven fabric, controlling the liquid content to be 60-90 wt%, and then curing at 110-130 ℃ to obtain a sulfydryl modified ES fiber non-woven fabric;
s3 hydrophilic finishing: immersing the mercapto-modified ES fiber non-woven fabric prepared in the step S2 into the grafting finishing liquid, and irradiating one side of the mercapto-modified ES fiber non-woven fabric with ultraviolet rays; and then washing with water and drying.
2. The hydrophilic finishing method for ES fiber nonwoven fabric for the surface coating of a sanitary napkin according to claim 1, comprising the steps of:
s1 pretreatment
Adding the ES fiber non-woven fabric into a sodium hydroxide aqueous solution with the molar concentration of 3-6 mol/L for soaking for 20-40 min according to the bath ratio of 1 (5-10) (v/v); washing the ES fiber non-woven fabric with water until the pH value of the fabric surface is 7; drying at 60-90 ℃ for 8-20 h to obtain the pretreated ES fiber non-woven fabric;
s2 thiol modification
Adding the ES fiber non-woven fabric pretreated in the step S1 into a sulfydryl modified liquid according to a bath ratio of 1 (5-10) (v/v), soaking for 20-40 min at 10-35 ℃, taking out the ES fiber non-woven fabric, controlling the liquid content to be 60-90 wt%, and then curing for 5-10 min at 110-130 ℃ to obtain a sulfydryl modified ES fiber non-woven fabric;
s3 hydrophilic finishing:
immersing the sulfhydryl-modified ES fiber non-woven fabric prepared in the step S2 into the grafting finishing liquid according to the bath ratio of 1 (3-6) (v/v), and irradiating one side of the sulfhydryl-modified ES fiber non-woven fabric with ultraviolet rays with the wavelength of 10-400 nm for 40-80 min; and then washing with water and drying.
3. The hydrophilic finishing method for ES fiber nonwoven fabric for the surface coating of sanitary napkin according to claim 1 or 2, characterized in that: the sulfydryl modified liquid is prepared by adding 3-mercaptopropyltrimethoxysilane into an ethanol aqueous solution of hydrochloric acid, stirring and mixing for 20-40 min at 10-35 ℃.
4. The hydrophilic finishing method for ES fiber nonwoven fabric for the surface coating of a sanitary napkin as claimed in claim 3, wherein: the dosage of the 3-mercaptopropyltrimethoxysilane is 2-4 wt% of the ethanol hydrochloride aqueous solution.
5. The hydrophilic finishing method for ES fiber nonwoven fabric for the surface coating of a sanitary napkin as claimed in claim 3, wherein: the hydrochloric acid ethanol water solution is prepared by adding 70-90 mL of absolute ethanol into 10-30 mL of 0.1mol/L diluted hydrochloric acid and uniformly mixing.
6. The hydrophilic finishing method for ES fiber nonwoven fabric for the surface coating of sanitary napkin according to claim 1 or 2, characterized in that: the grafting finishing liquid consists of 8-12 wt% of hydrophilic compound with hydrogen sulfonic group, 0.5-1.5 wt% of initiator and the balance of water.
7. The hydrophilic finishing method for ES fiber nonwoven fabric for the surface coating of sanitary napkin according to claim 6, wherein: the hydrophilic compound of the hydrogen sulfonic group is 3-propyl methacrylate potassium sulfonate.
8. The hydrophilic finishing method for ES fiber nonwoven fabric for the surface coating of sanitary napkin according to claim 6, wherein: the initiator is any one of 2, 2-dimethylolpropionic acid, 2-dimethylolbutyric acid and 4,4' -methylenebis (3-chloro-2, 6-diethylaniline) or the mixture of two of the two.
9. The hydrophilic finishing method for ES fiber nonwoven fabric as claimed in claim 8, wherein the method comprises the following steps: the initiator is a mixture of 2, 2-dimethylolpropionic acid and 4,4' -methylenebis (3-chloro-2, 6-diethylaniline) according to a mass ratio of (1-3) to 1.
10. A single-sided hydrophilic sanitary towel surface coating ES fiber non-woven fabric is characterized in that: the sanitary towel surface coating ES fiber non-woven fabric is prepared by adopting the hydrophilic finishing method of the sanitary towel surface coating ES fiber non-woven fabric as claimed in any one of claims 1 to 9.
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