CN111662669B - Hydrophilic hot-melt adhesive and preparation method and application thereof - Google Patents

Hydrophilic hot-melt adhesive and preparation method and application thereof Download PDF

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Publication number
CN111662669B
CN111662669B CN201910167478.6A CN201910167478A CN111662669B CN 111662669 B CN111662669 B CN 111662669B CN 201910167478 A CN201910167478 A CN 201910167478A CN 111662669 B CN111662669 B CN 111662669B
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polyol
melt adhesive
polyester
hydrophilic
polyhydroxy
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CN111662669A (en
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霍毅松
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Suzhou Baihan Weikang New Material Co ltd
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Suzhou Kehua Juhui New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/06—Polyurethanes from polyesters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/58—Adhesives
    • A61L15/585—Mixtures of macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3203—Polyhydroxy compounds
    • C08G18/3206—Polyhydroxy compounds aliphatic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4202—Two or more polyesters of different physical or chemical nature
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4205—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups
    • C08G18/4208—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing aromatic groups
    • C08G18/4211—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing aromatic groups derived from aromatic dicarboxylic acids and dialcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
    • C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4804—Two or more polyethers of different physical or chemical nature
    • C08G18/4812—Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4829—Polyethers containing at least three hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6607—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6607—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
    • C08G18/6611—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203 having at least three hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/08—Polyurethanes from polyethers

Abstract

The invention discloses a hydrophilic hot-melt adhesive and a preparation method and application thereof. The preparation method comprises the following steps: the hydrophilic hot melt adhesive is formed by copolymerization reaction of a uniformly mixed reaction system containing polyhydroxy polyether, polyhydroxy polyester, polyol, polyisocyanate, low-melting polyester and polyurethane. The application of the hydrophilic hot-melt adhesive prepared by the method in the field of manufacturing sanitary absorbent articles comprises the step of carrying out multi-layer bonding on an absorption site material contained in the sanitary absorbent articles by using the hydrophilic hot-melt adhesive. The sanitary absorbing article of the present invention is obtained by adhering the absorbing part material in multiple layers by using the hydrophilic hot-melt adhesive. The preparation method of the hydrophilic hot-melt adhesive is simple in process, and the hydrophilic hot-melt adhesive is used for bonding multiple non-woven fabric layers in the main structure of the sanitary absorbent articles such as paper diapers and the like, so that the absorption performance of the sanitary absorbent articles such as the paper diapers and the like can be effectively improved.

Description

Hydrophilic hot-melt adhesive and preparation method and application thereof
Technical Field
The invention relates to a hydrophilic adhesive, in particular to a hydrophilic hot-melt adhesive applied to the bonding effect of a plurality of non-woven fabric layers in a sanitary absorption article, a preparation method thereof and application thereof in manufacturing the sanitary absorption article.
Background
In the design of sanitary absorbent articles such as diapers, it is desirable to use a multi-layer nonwoven structure. The typical structure is as follows: the uppermost layer is contacted with the surface layer of the skin of a user, the diversion layer which plays a role in diffusing urine is arranged below the surface layer, and the core body wrapping layer is arranged below the diversion layer. The core body wrapping layer can wrap a prefabricated composite core body and can also wrap a core body formed by directly and physically mixing wood pulp and water-absorbing polymers. Each layer of non-woven fabric structure can be a layer of non-woven fabric, or a plurality of layers of non-woven fabrics, and the non-woven fabric structure is formed by compounding through mechanical pressing, hot pressing or bonding methods. In the structure of the paper diaper, the non-woven fabric materials are required to be bonded together, so that the structure of the paper diaper is kept to form a whole. The method currently used in the market is to apply a hot-melt adhesive, including a rubber system or polyolefin system adhesive, between the non-woven fabric layers, bonding the non-woven fabric layers together in a filament, strip, web, sheet or full-width form according to different processes and product designs.
From the functional aspect of the diaper, it is necessary to allow urine to effectively penetrate through the composite layer of the above multi-layer nonwoven fabric and be absorbed by the core. Functionally, firstly, urine is required to pass through the non-woven fabric layer as quickly as possible, and secondly, after urine passes through the non-woven fabric layer once, twice or more times, the non-woven fabric layer can still keep good urine passing performance.
The non-woven fabric material is generally formed by polypropylene fibers, polyethylene-wrapped polypropylene, polyethylene-wrapped polyester fibers and the like, and the fibers are water-repellent materials with low surface energy, so that liquid such as urine and the like cannot permeate the non-woven fabric layer quickly and effectively. In order to meet the requirement of the absorption functionality of the diaper, the fiber nonwoven fabric needs to be subjected to hydrophilic treatment, so that a layer of hydrophilic agent (i.e. surfactant) is attached to the fiber surface of the fiber nonwoven fabric, and thus the nonwoven fabric has hydrophilicity and can allow liquid such as urine to effectively penetrate through the nonwoven fabric. However, when urine passes through the hydrophilic agent attached to the surface of the nonwoven fabric fiber, the hydrophilic agent is dissolved in the urine and eluted from the surface of the fiber, so that the surface of the fiber is changed to low surface energy water repellency again. Resulting in a reduced urine penetration rate thereafter, especially after multiple urine penetrations.
Meanwhile, the hot-melt rubber-based or polyolefin adhesive between the non-woven fabric layers is a water-repellent material with low surface energy. The presence of the adhesive layer thus in fact constitutes a threadlike, strip-like, net-like or sheet-like water-repellent interface layer, reducing the urine permeation rate. Particularly, when the non-woven fabric fiber surface hydrophilic agent is eluted during use, the urine penetration rate of the paper diaper can be obviously reduced. This is manifested in an extended penetration time of the urine after the second, third and further times.
The reduction of the urine permeability causes the consumers to feel uncomfortable in the using process, prolongs the time of the skin contacting the urine, and increases the possibility of skin irritation, allergy and redness.
On the other hand, the diaper needs to prevent absorbed urine from leaking out from the bottom and the thighs. Structurally, breathable films and spun-bonded melt-blown non-woven fabrics are used as barrier materials. However, in the using process, the hydrophilic agent attached to the surface of the non-woven fabric fiber is dissolved in urine when the urine passes through, thereby reducing the surface tension of the urine. The low surface energy urine can more easily permeate the breathable film and the spun-bonded melt-blown non-woven fabric, so that the possibility of urine leakage is increased, and the problem of use of consumers is caused.
Disclosure of Invention
The invention mainly aims to provide a hydrophilic hot-melt adhesive, a preparation method and application thereof, so as to overcome the defects of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:
the embodiment of the invention provides a preparation method of a hydrophilic hot-melt adhesive, which comprises the following steps: copolymerizing a homogeneously mixed reaction system comprising a polyhydroxypolyether, polyhydroxypolyester, polyol with or without inclusion, polyisocyanate, low-melting polyester with or without inclusion, polyurethane with or without inclusion to form a hydrophilic hot-melt adhesive.
In some embodiments, the temperature of the copolymerization reaction is 60-160 ℃ and the time is 1-8 h.
In some embodiments, the homogeneous mixed reaction system comprises the following components in percentage by mass: 24-65 wt% of polyhydroxy polyether, 27-65 wt% of polyhydroxy polyester, less than 5wt% of polyol, 5-16 wt% of polyisocyanate, less than 2wt% of low-melting-point polyester and less than 2wt% of polyurethane.
Embodiments of the present invention also provide a hydrophilic hot melt adhesive prepared by the foregoing method, which includes a copolymer formed by copolymerization of a polyhydroxy polyether, a polyhydroxy polyester, a polyol, a polyisocyanate, a low melting point polyester, and a polyurethane.
The embodiment of the invention also provides application of the hydrophilic hot-melt adhesive in the field of manufacturing of sanitary absorbent articles.
The embodiment of the invention also provides a sanitary absorption article which is obtained by bonding the hydrophilic hot-melt adhesive on the absorption part material in multiple layers.
Further, the hydrophilic hot melt adhesive is disposed between at least two layers of absorbent site materials.
Compared with the prior art, the invention has the advantages that:
1) the preparation method of the hydrophilic hot-melt adhesive provided by the invention is simple in process, and the hydrophilic hot-melt adhesive is used for bonding a plurality of non-woven fabric layers in the main structure of the sanitary absorption articles such as paper diapers and the like to replace the existing water-repellent hot-melt rubber base and polyolefin adhesive, and different non-woven fabric structural materials are bonded at the absorption functional parts of the paper diapers and the like, so that the absorption performance of the sanitary absorption articles such as the paper diapers and the like can be effectively improved;
2) the hydrophilic hot-melt adhesive provided by the invention can effectively improve the multiple hydrophilicity of the water absorption part materials of sanitary absorbent articles such as paper diapers and the like. Under the conditions that normal saline simulating urine passes through and is absorbed for the first time and a non-woven fabric hydrophilic agent is partially eluted, the normal saline is tested for the second time, the adhesive structure disclosed by the invention has quicker passing and absorption compared with a rubber-based hot melt adhesive structure, so that the absorption of a sanitary product on multiple times of urine can be effectively improved in application;
3) the present invention may use lower cost non-hydrophilic nonwovens. In the embodiment, non-woven fabrics such as spun-bonded fabrics and spun-melt fabrics which are not subjected to hydrophilic treatment are used, and a structure formed by bonding rubber-based and polyolefin hot melt adhesives is used, so that physiological saline cannot penetrate through the non-woven fabrics, and the non-woven fabrics cannot be directly used as an absorption function structure of a sanitary product. With the bonding structure of the invention, because of the existence of the hydrophilic hot-melt adhesive, a hydrophilic structure layer is formed on the fiber surface of the non-woven fabric, so that the physiological saline can effectively infiltrate the surface layer of the non-woven fabric and then penetrate the non-woven fabric through the capillary action. The physiological saline water can rapidly penetrate through the non-woven fabric layer without hydrophilic treatment, and the non-woven fabric layer can be used as an absorption functional structure of a sanitary product. Therefore, the non-woven fabric which is not subjected to hydrophilic treatment is used, so that the cost of the sanitary product can be effectively reduced;
4) the invention uses the non-woven fabrics which are not subjected to hydrophilic treatment, and can reduce the use of a non-woven fabric hydrophilic agent. The non-woven fabric hydrophilic agent enters absorbed urine after being eluted, so that the polarity of the urine is reduced, and the urine is easier to seep out from the leg leakage-proof three-dimensional protection enclosure and the basement membrane. In comparison with pure water with surface energy value 71 (maximum bubble method), by applying the structure of the invention, the surface energy value of the non-hydrophilic spun-bonded non-woven fabric is more than 65 after the non-hydrophilic spun-bonded non-woven fabric is matched with the hydrophilic hot melt adhesive, and the surface energy value is reduced to 55 by matching the hydrophilic spun-bonded non-woven fabric with the rubber-based hot melt adhesive. Therefore, the structure of the invention can effectively avoid the reduction of the surface energy of urine after the hydrophilic agent is dissolved, and reduce the seepage risk.
Drawings
FIG. 1 is a schematic view of an absorbent functional structure of a sanitary absorbent article according to an exemplary embodiment of the present invention.
Description of the drawings: 1-surface layer, 2-second surface layer, 3-flow guide layer, 4-core body wrapping layer and 5-hydrophilic hot melt adhesive.
Detailed Description
As described above, in view of the defects of the prior art, the present inventors have made extensive studies and extensive practices to provide a hydrophilic adhesive, a multi-layer bonding of the absorbent site material of the sanitary absorbent article using the hydrophilic adhesive, and a sanitary absorbent article structure using the same. The technical solution, its implementation and principles, etc. will be further explained as follows.
As an aspect of the present invention, there is provided a method for preparing a hydrophilic hot-melt adhesive, comprising: copolymerizing a homogeneously mixed reaction system comprising a polyhydroxypolyether, polyhydroxypolyester, polyol with or without inclusion, polyisocyanate, low-melting polyester with or without inclusion, polyurethane with or without inclusion to form a hydrophilic hot-melt adhesive.
In some embodiments, the above polyhydroxy polyethers, polyhydroxy polyesters may be heated, premixed and agitated first, and then the polyisocyanate may be dosed in one or more steps. The temperature of the copolymerization reaction is 60-160 ℃, and the time is 1-8 h, preferably 2-8 h.
Further, after the reaction is finished, materials such as polyhydroxy polyether, polyhydroxy polyester, polyol, polyurethane, low-melting point polyester and the like can be further added.
In some embodiments, the homogeneous mixed reaction system comprises the following components in percentage by mass: 24-65 wt% of polyhydroxy polyether, 27-65 wt% of polyhydroxy polyester, less than 5wt% of polyol, 5-16 wt% of polyisocyanate, less than 2wt% of low-melting-point polyester and less than 2wt% of polyurethane.
In some embodiments, the polyhydroxy polyether includes a first polyol such as polyethylene glycol, polypropylene glycol, polybutylene glycol, and the like, and 2-hydroxy, 3-hydroxy, 4-hydroxy functional derivatives of the above first polyol, and the like, but is not limited thereto.
Further, the first polyol includes any one or a combination of two or more of polyethylene glycol, polypropylene glycol, polybutylene glycol, and the like, but is not limited thereto.
Further, the mass-average molecular weight of the polyhydroxy polyether is 500-20000.
In some embodiments, the polyhydroxy polyester includes, but is not limited to, polyesters of poly (adipic acid) and secondary polyols such as ethylene glycol, glycerol, neopentyl glycol, and derivatives thereof using ring opening synthesis, polyesters of poly (phthalic acid) and secondary polyols such as ethylene glycol, glycerol, neopentyl glycol, and derivatives thereof using other synthetic routes, or polyesters of poly (isophthalic acid) and secondary polyols, derivatives of polyesters of poly (isophthalic acid) and secondary polyols, and the like.
Further, the second polyol includes any one or a combination of two or more of ethylene glycol, glycerin, neopentyl glycol, butylene glycol, hexylene glycol, and the like, but is not limited thereto.
Further, the mass average molecular weight of the polyhydroxy polyester is 500-10000, preferably 1000-5000.
In some embodiments, the polyol includes any one or a combination of two or more of glycerol, erythritol, pentaerythritol, sorbitol, xylitol, and the like, but is not limited thereto.
In some embodiments, the polyisocyanate includes any one of MDI, TDI, HDI, a combination of two or more thereof, and/or a polymer thereof, but is not limited thereto.
As another aspect of the present invention, it relates to a hydrophilic hot melt adhesive prepared by the foregoing method, comprising a copolymer formed by copolymerization of a polyhydroxypolyether, a polyhydroxypolyester, a polyol, a polyisocyanate, a low-melting polyester and a polyurethane.
In another aspect, the present invention further provides a use of the above-mentioned hydrophilic hot-melt adhesive in the field of manufacturing sanitary absorbent articles.
Further, the application includes: the hydrophilic hot-melt adhesive is adopted to carry out multilayer bonding on the material of the absorption part contained in the sanitary absorption article.
Further, the sanitary absorbent article may be, but is not limited to, a baby diaper, an adult diaper, a feminine napkin, or the like.
Further, the application includes: the hydrophilic hot-melt adhesive is coated on the surface of the material of the absorption part by means of spraying, knife coating or roller coating, but is not limited thereto.
Furthermore, the hydrophilic hot-melt adhesive forms a discontinuous coating form on the surface of the material of the absorption part.
Further, the discontinuous coating form includes a sheet form, a stripe form, a full-page form, etc., and preferably a silk net form, wherein the morphology of the silk net form includes a large spiral form, an Omiga form, a linear form, a random form, etc., but is not limited thereto.
Furthermore, the application amount of the hydrophilic hot-melt adhesive between every two layers of absorption part materials is 0.1-20 g/m2Preferably 0.5 to 5g/m2。
In another aspect of the embodiment of the present invention, there is provided a sanitary absorbent article obtained by bonding the absorbent site material in multiple layers using the above-mentioned hydrophilic hot-melt adhesive.
Further, the bonded absorbent site materials include, but are not limited to, a skin-engaging facing layer 1, a second facing layer 2 below the facing layer, a flow guiding layer 3 below the facing layer, a core wrapping layer 4 below the flow guiding layer, and a core surface layer below the flow guiding layer, which are sequentially arranged along a predetermined direction, as shown in fig. 1.
Further, the material of the absorption part comprises spun-bonded non-woven fabric, spun-melt non-woven fabric, spunlace non-woven fabric, hot air non-woven fabric or dust-free paper, and the gram weight is 8g/m2～100g/m2。
Further, as shown in fig. 1, the absorption function structure of the sanitary absorption article comprises a surface layer non-woven fabric, a second surface layer non-woven fabric, a flow guide layer non-woven fabric, a wrapping layer non-woven fabric or wrapping layer dust-free paper, a composite core body surface layer non-woven fabric or composite core body surface layer dust-free paper, wherein at least two layers of the surface layer non-woven fabric, the wrapping layer non-woven fabric or wrapping layer dust-free paper are provided with a hydrophilic hot melt adhesive 5.
Further, the above structure uses a hydrophilic hot-melt type adhesive between each layer.
Further, the absorbent site material is subjected to hydrophilic treatment, and further, the absorbent site material includes a hydrophilic nonwoven fabric or a non-hydrophilic nonwoven fabric.
Further, the sanitary absorbent article may be, but is not limited to, a baby diaper, an adult diaper, a feminine napkin, or the like.
By the technical scheme, the preparation method of the hydrophilic hot-melt adhesive is simple in process, and the hydrophilic hot-melt adhesive is used for bonding multiple non-woven fabric layers in the main structure of the sanitary absorbent articles such as paper diapers and the like, so that the absorption performance of the sanitary absorbent articles such as the paper diapers and the like can be effectively improved.
The technical solution of the present invention is further described in detail by the following examples. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The formula of the hydrophilic hot-melt adhesive in this example was selected from 25g of difunctional poly (ethylene glycol adipate) (molecular weight 3000), 40g of difunctional poly (ethylene glycol) (molecular weight 3000), 25g of poly (neopentyl glycol adipate) (molecular weight 3000), 16g of 3-functional polyether, and 9.5g of MDI. The components are uniformly mixed and then subjected to copolymerization reaction, the reaction temperature is set to be 160 ℃, and the reaction time is 1 h. Then, 6g of neopentyl glycol was added, and the temperature was gradually decreased to 120 ℃ to react for 1 hour.
The viscosity of the hydrophilic hot-melt adhesive synthesized in the embodiment is 7000 centipoises at 160 ℃, and the hydrophilic hot-melt adhesive can be effectively coated on a non-woven fabric substrate.
Example 2
The hydrophilic hot-melt adhesive prepared in example 1 was compared to a commercially available rubber-based hot-melt adhesive using a size application device using 15g/m2The hydrophilic spun-bonded non-woven fabric comprises two hydrophilic spun-bonded non-woven fabrics, wherein a linear glue line with the diameter of 0.5mm is coated on the surface of a first non-woven fabric, the distance between the glue lines is 3mm, and a second non-woven fabric is attached. The physiological saline permeation rate was tested using a dust-free filter paper pad under the above nonwoven fabric layer to be tested. Using 1cm2The sectional area of the syringe, each time using 5mL of saline, record the first, second, third saline penetration time. The results are given in table 1 below.
TABLE 1
Percolation time(s) Hydrophilic hot-melt adhesive structure Rubber-based adhesive structure
For the first time 24 24
For the second time 26 30
The third time 27 40
Therefore, the non-woven fabric layer of the absorption functional part of the paper diaper bonded by the hydrophilic hot-melt adhesive shows more durable hydrophilic permeability than the material of the rubber-based non-hydrophilic adhesive.
Example 3
The hydrophilic hot melt adhesive prepared in example 1 was compared to a commercially available rubber-based hot melt adhesive using 15g/m2The non-hydrophilic spun-bonded non-woven fabric is characterized in that linear glue lines with the diameter of 0.5mm are coated on the surface of the non-woven fabric, the distance between the glue lines is 3mm, and then a dust-free filter paper pad is used for testing the permeation rate of physiological saline below the non-woven fabric layer to be tested. Using 1cm2The syringe with the cross section is placed in a non-woven fabric glue applying cylinder, 2mL of physiological saline is used each time, and the first penetration permeation time and the second penetration permeation time are respectively recorded. The results are given in table 2 below.
TABLE 2
Percolation time(s) Hydrophilic hot-melt adhesive structure Rubber-based adhesive structure
For the first time 10 Greater than 60, impermeable
For the second time 11 Greater than 60, impermeable
Therefore, the hydrophilic hot-melt adhesive can effectively change the surface of the non-hydrophilic non-woven fabric, so that the surface of the non-hydrophilic non-woven fabric has hydrophilicity, and the non-hydrophilic non-woven fabric can be used at the absorption function parts of sanitary products such as paper diapers and the like. The water-repellent rubber-based hot melt adhesive has no function.
Example 4
The hydrophilic hot-melt adhesive prepared in example 1 was compared to a commercially available rubber-based hot-melt adhesive using a size application device using 15g/m2The hydrophilic spun-bonded non-woven fabric comprises two hydrophilic spun-bonded non-woven fabrics, wherein a linear glue line with the diameter of 0.5mm is coated on the surface of a first non-woven fabric, the distance between the glue lines is 3mm, and a second non-woven fabric is attached. The absorbent polymer and wood pulp mixture in the diaper core is used to be padded under the above nonwoven fabric layer to be tested. Using 1cm2The sectional area of the syringe, each time using 3mL of saline, record the first, second, third saline penetration time. The results are given in Table 3 below.
TABLE 3
Percolation time(s) Hydrophilic hot-melt adhesive structure Rubber-based adhesive structure
For the first time 10 11
For the second time 13 20
The third time 16 40
Example 5
15g/m coated with the hydrophilic Hot melt adhesive of example 32Non-hydrophilic nonwoven 10cm by 10cm samples, 15g/m rubber-based hot melt adhesive coated in comparative example 22Non-hydrophilic nonwoven 10cm by 10cm monolayer samples. Soaking in 100mL of purified water for 5 min. The surface energy of the water in the two samples was then separately measured using the maximum bubble method.
Purified water used for the experiments had an initial surface energy of 71.
Tests show that the surface energy of the hydrophilic non-woven fabric coated with the rubber-based hot melt adhesive is reduced to 55 after the hydrophilic non-woven fabric is soaked. After the non-hydrophilic non-woven fabric coated with the hydrophilic hot-melt adhesive in example 3 is soaked, the surface energy is only reduced to 67.
Therefore, the non-hydrophilic adhesive is matched with the non-hydrophilic non-woven fabric to be applied to the absorption part of the paper diaper, and compared with the non-woven fabric treated by using the hydrophilic agent, the influence of the hydrophilic agent on the surface performance of the absorption liquid can be effectively reduced, and the risk of permeation and seepage of the absorption liquid such as urine and the like is reduced.
Example 6
The formula of the hydrophilic hot melt adhesive in this example is selected from 25g of difunctional poly (ethylene adipate) (molecular weight 3000), 40g of difunctional polyethylene glycol (molecular weight 3000), 6g of polyethylene phthalate (molecular weight 1600), 5g of 3-functional polyether and 6g of MDI. The components are evenly mixed and then subjected to copolymerization reaction, the initial reaction temperature is 60 ℃, and the reaction time is 1 h. Then the temperature is raised to 140 ℃, 1g of erythritol is added, and the reaction is continued for 2 h.
The hydrophilic hot melt adhesive synthesized in this example had a viscosity of 7000 cps at 160 ℃. Can be effectively coated on the surface of a substrate such as non-woven fabric.
Example 7
The formula of the hydrophilic hot melt adhesive in this example is selected from 25g of difunctional poly (ethylene adipate) (molecular weight 3000), 40g of difunctional polyethylene glycol (molecular weight 3000), 6g of polyethylene phthalate (molecular weight 1600), 10g of 3-functional polyether and 6g of MDI. The components are evenly mixed and then carry out copolymerization reaction, the reaction temperature is 120 ℃, and the reaction time is 2 hours. Then, 1g of erythritol and 1.5g of polyester having a melting point of 135 ℃ were added thereto, and the reaction was continued for 6 hours.
The hydrophilic hot melt adhesive synthesized in this example had a viscosity of 6000 cps at 160 ℃. Can be effectively coated on the surface of a substrate such as non-woven fabric.
Example 8
The formula of the hydrophilic hot melt adhesive in this example is selected from 25g of difunctional poly (ethylene adipate) (molecular weight 3000), 40g of difunctional polyethylene glycol (molecular weight 3000), 6g of polyethylene phthalate (molecular weight 1600), 5g of 3-functional polyether and 6g of MDI. The components are evenly mixed and then subjected to copolymerization reaction, the reaction temperature is 160 ℃, and the reaction time is 1 h. Then, 1g of erythritol and 1.5g of polyurethane with a softening point of 100 ℃ were added, and the reaction was continued for 5 hours.
The hydrophilic hot-melt adhesive synthesized by the embodiment can be effectively coated on the surface of a substrate such as non-woven fabric at 160 ℃.
Example 9
The formula of the hydrophilic hot-melt adhesive in this example is selected from 50g of difunctional poly (ethylene glycol adipate) (molecular weight 3000), 20g of difunctional poly (ethylene glycol) (molecular weight 3000), 10g of difunctional polyether (molecular weight 4000), 10g of 3-functional polyether, 7g of MDI, and 2g of neopentyl glycol. The components are mixed and reacted at the reaction temperature of 140 ℃ for 4 hours, and then added for reaction for 1 hour.
The hydrophilic hot-melt adhesive synthesized by the embodiment can be effectively coated on the surface of a substrate such as non-woven fabric at 160 ℃.
Example 10
The formula of the hydrophilic hot-melt adhesive in this example was selected from 60g of difunctional poly (neopentyl glycol adipate) (molecular weight 2000), 60g of difunctional polyethylene glycol (molecular weight 1000), 6g of 3-functional polyether, 5.5g of MDI, and 2g of neopentyl glycol. The components are mixed and reacted, the reaction temperature is 140 ℃, and the reaction time is 1 h.
The hydrophilic hot-melt adhesive synthesized by the embodiment can be effectively coated on the surface of a substrate such as non-woven fabric at 160 ℃.
Example 11
The formulation of the hydrophilic hot melt adhesive in this example was selected from 100g of difunctional neopentyl glycol adipate (molecular weight 2000), 50g of difunctional polyether (molecular weight 1000), 150g of 3-functional polyether and 25g of MDI. The components are mixed and reacted, the reaction temperature is 140 ℃, and the reaction time is 4 hours.
The hydrophilic hot-melt adhesive synthesized by the embodiment can be effectively coated on the surface of a substrate such as non-woven fabric at 140 ℃.
Example 12
The formula of the hydrophilic hot melt adhesive in this example is selected from 90g of difunctional poly (ethylene glycol adipate) (molecular weight 3000), 130g of difunctional polyether (molecular weight 4000), 60g of 3-functional polyether and 18g of MDI. The components are mixed and reacted, the reaction temperature is 140 ℃, and the reaction time is 2 hours.
The hydrophilic hot-melt adhesive synthesized by the embodiment can be effectively coated on the surface of a substrate such as non-woven fabric at 160 ℃.
Example 13
The formula of the hydrophilic hot-melt adhesive in this example was selected from 80g of difunctional poly (neopentyl glycol adipate) (molecular weight 2000), 20g of difunctional polyether (molecular weight 4000), 10g of 3-functional polyether, 12g of MDI and 1.5g of neopentyl glycol. The components are mixed and reacted, the reaction temperature is 140 ℃, and the reaction time is 4 hours.
The hydrophilic hot-melt adhesive synthesized by the embodiment can be effectively coated on the surface of a substrate such as non-woven fabric at 160 ℃.
In summary, according to the technical scheme of the invention, the preparation method of the hydrophilic hot-melt adhesive provided by the invention is simple in process, and the hydrophilic hot-melt adhesive is used for bonding the multiple non-woven fabric layers in the main structure of the sanitary absorbent articles such as paper diapers and the like, so that the absorption performance of the sanitary absorbent articles such as paper diapers and the like can be effectively improved.
In addition, the inventor also refers to the mode of examples 1-13, and tests are carried out by using other raw materials and conditions listed in the specification, and a hydrophilic resin adhesive capable of effectively improving the absorption performance of sanitary absorbent articles such as paper diapers and the like and a sanitary absorbent article with excellent absorption performance are also prepared.
It should be understood that the above-mentioned embodiments are merely illustrative of the technical concepts and features of the present invention, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and therefore, the protection scope of the present invention is not limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (14)

1. The application of a hydrophilic hot-melt adhesive in the field of manufacturing sanitary absorbent articles, wherein the hydrophilic hot-melt adhesive comprises a copolymer formed by copolymerization of polyhydroxy polyether, polyhydroxy polyester, polyol, polyisocyanate, low-melting-point polyester and polyurethane, and the preparation method of the hydrophilic hot-melt adhesive comprises the following steps: copolymerizing a uniformly mixed reaction system containing polyhydroxy polyether, polyhydroxy polyester, polyol, polyisocyanate, low-melting-point polyester and polyurethane to form the hydrophilic hot-melt adhesive, wherein the uniformly mixed reaction system comprises the following components in percentage by mass: 24-65 wt% of polyhydroxy polyether, 27-65 wt% of polyhydroxy polyester, less than 5wt% of polyol, 5-16 wt% of polyisocyanate, less than 2wt% of low melting point polyester and less than 2wt% of polyurethane, wherein the polyhydroxy polyether is selected from a first polyol and/or a 2 hydroxyl, 3 hydroxyl or 4 hydroxyl functional group derivative of the first polyol, the first polyol is selected from one or more of polyethylene glycol, polypropylene glycol and polybutylene glycol, the polyhydroxy polyether has a mass average molecular weight of 500-20000, the polyhydroxy polyester is selected from a polyester formed by polyadipic acid and a second polyol, a derivative formed by polyester formed by polyadipic acid and a second polyol, a polyester formed by polyaphtalic acid and a second polyol, a derivative formed by polyester formed by polyaphtalic acid and a second polyol, a polyester formed by ring-opening of polyaphtalic acid and a second polyol, a polyester formed by ring-opening of polyaphtalic acid and a second polyol, Any one or a combination of two or more of derivatives of polyesters formed from poly (isophthalic acid) and a second polyol; the second polyol is selected from any one or combination of more than two of ethylene glycol, glycerol, neopentyl glycol, butanediol and hexanediol, the mass-average molecular weight of the polyhydroxy polyester is 500-10000, and the polyol is selected from any one or combination of more than two of glycerol, erythritol, pentaerythritol, sorbitol and xylitol; the polyisocyanate is selected from any one of MDI, TDI and HDI, a combination of more than two of the MDI, the TDI and the HDI and/or a polymer thereof; the low-melting-point polyester is thermoplastic polyethylene terephthalate; the polyurethane is a thermoplastic polyurethane elastomer, the temperature of the copolymerization reaction is 60-160 ℃, and the time is 1-8 h.
2. Use according to claim 1, characterized in that: the time of the copolymerization reaction is 2-8 h.
3. Use according to claim 1, characterized in that: the mass average molecular weight of the polyhydroxy polyester is 1000-4000.
4. The application according to claim 1, wherein the application comprises: the hydrophilic hot-melt adhesive is adopted to carry out multilayer bonding on the material of the absorption part contained in the sanitary absorption article.
5. Use according to claim 4, wherein said sanitary absorbent article is selected from the group consisting of baby diapers, adult diapers and feminine napkins.
6. The application according to claim 4, wherein the application comprises: and coating the hydrophilic hot-melt adhesive on the surface of the material at the absorption part in a spraying, blade coating or roller coating mode, wherein the hydrophilic hot-melt adhesive forms a discontinuous coating form on the surface of the material at the absorption part.
7. Use according to claim 6, characterized in that: the discontinuous coating form is selected from a sheet form, a strip form or a silk net form, wherein the morphology of the silk net form is selected from a large spiral form, an Omiga form, a linear form or a random form.
8. Use according to claim 4, characterized in that: the application amount of the hydrophilic hot-melt adhesive between every two layers of absorption part materials is 0.1-20 g/m2。
9. Use according to claim 8, characterized in that: the application amount of the hydrophilic hot-melt adhesive between every two layers of absorption part materials is 0.5-5 g/m2。
10. A sanitary absorbing article is characterized in that the sanitary absorbing article is obtained by bonding multiple layers of absorbing position materials by using a hydrophilic hot-melt adhesive; the absorption part material comprises a skin-fitting surface layer and a second surface layer which are sequentially arranged along a set directionThe core body comprises a flow guide layer, a core body wrapping layer and a core body surface layer; the absorbing part material is selected from spun-bonded non-woven fabric, spun-melt non-woven fabric, spunlace non-woven fabric, hot air non-woven fabric or dust-free paper, and the gram weight is 7g/m2~100 g/m2；
The hydrophilic hot-melt adhesive comprises a copolymer formed by copolymerization of polyhydroxy polyether, polyhydroxy polyester, polyol, polyisocyanate, low-melting-point polyester and polyurethane, and the preparation method of the hydrophilic hot-melt adhesive comprises the following steps: copolymerizing a uniformly mixed reaction system containing polyhydroxy polyether, polyhydroxy polyester, polyol, polyisocyanate, low-melting-point polyester and polyurethane to form the hydrophilic hot-melt adhesive, wherein the uniformly mixed reaction system comprises the following components in percentage by mass: 24-65 wt% of polyhydroxy polyether, 27-65 wt% of polyhydroxy polyester, less than 5wt% of polyol, 5-16 wt% of polyisocyanate, less than 2wt% of low melting point polyester and less than 2wt% of polyurethane, wherein the polyhydroxy polyether is selected from a first polyol and/or a 2 hydroxyl, 3 hydroxyl or 4 hydroxyl functional group derivative of the first polyol, the first polyol is selected from one or more of polyethylene glycol, polypropylene glycol and polybutylene glycol, the polyhydroxy polyether has a mass average molecular weight of 500-20000, the polyhydroxy polyester is selected from a polyester formed by polyadipic acid and a second polyol, a derivative formed by polyester formed by polyadipic acid and a second polyol, a polyester formed by polyaphtalic acid and a second polyol, a derivative formed by polyester formed by polyaphtalic acid and a second polyol, a polyester formed by ring-opening of polyaphtalic acid and a second polyol, a polyester formed by ring-opening of polyaphtalic acid and a second polyol, Any one or a combination of two or more of derivatives of polyesters formed from poly (isophthalic acid) and a second polyol; the second polyol is selected from any one or combination of more than two of ethylene glycol, glycerol, neopentyl glycol, butanediol and hexanediol, the mass-average molecular weight of the polyhydroxy polyester is 500-10000, and the polyol is selected from any one or combination of more than two of glycerol, erythritol, pentaerythritol, sorbitol and xylitol; the polyisocyanate is selected from any one of MDI, TDI and HDI, a combination of more than two of the MDI, the TDI and the HDI and/or a polymer thereof; the low-melting-point polyester is thermoplastic polyethylene terephthalate; the polyurethane is a thermoplastic polyurethane elastomer, the temperature of the copolymerization reaction is 60-160 ℃, and the time is 1-8 h.
11. A sanitary absorbent article as defined in claim 10, wherein: the absorbent site material is selected from hydrophilic nonwoven fabrics or non-hydrophilic nonwoven fabrics.
12. A sanitary absorbent article as defined in claim 10, wherein: the hydrophilic hot melt adhesive is arranged between at least two layers of absorption part materials.
13. A sanitary absorbent article as defined in claim 12, wherein: the hydrophilic hot-melt adhesive is arranged between the materials of each layer of absorption part.
14. A sanitary absorbent article as defined in claim 10, wherein: the sanitary absorption article is selected from a baby diaper, an adult diaper or a sanitary towel for women.
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