CN111662672A - Hydrophilic adhesive and synthesis method and application thereof - Google Patents
Hydrophilic adhesive and synthesis method and application thereof Download PDFInfo
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- CN111662672A CN111662672A CN201910167487.5A CN201910167487A CN111662672A CN 111662672 A CN111662672 A CN 111662672A CN 201910167487 A CN201910167487 A CN 201910167487A CN 111662672 A CN111662672 A CN 111662672A
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- adhesive
- hydrophilic
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- 239000000853 adhesive Substances 0.000 title claims abstract description 61
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 61
- 238000001308 synthesis method Methods 0.000 title claims abstract description 5
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 34
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 27
- 229920000570 polyether Polymers 0.000 claims abstract description 27
- 229920000728 polyester Polymers 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000012948 isocyanate Substances 0.000 claims abstract description 10
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 10
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 34
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 17
- 229920001451 polypropylene glycol Polymers 0.000 claims description 16
- 239000003292 glue Substances 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 229920000562 Poly(ethylene adipate) Polymers 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- SENMPMXZMGNQAG-UHFFFAOYSA-N 3,4-dihydro-2,5-benzodioxocine-1,6-dione Chemical compound O=C1OCCOC(=O)C2=CC=CC=C12 SENMPMXZMGNQAG-UHFFFAOYSA-N 0.000 claims description 4
- FSEWDIPTRJFLRS-UHFFFAOYSA-N 2-(2,2-dimethylpropoxycarbonyl)benzoic acid Chemical compound CC(C)(C)COC(=O)C1=CC=CC=C1C(O)=O FSEWDIPTRJFLRS-UHFFFAOYSA-N 0.000 claims description 3
- VGHCVSPDKSEROA-UHFFFAOYSA-N 2-methyl-1,4-dioxecane-5,10-dione Chemical compound CC1COC(=O)CCCCC(=O)O1 VGHCVSPDKSEROA-UHFFFAOYSA-N 0.000 claims description 3
- ZJZLFDHSFOSUIJ-UHFFFAOYSA-N 4-methyl-3,4-dihydro-2,5-benzodioxocine-1,6-dione Chemical compound O=C1OC(C)COC(=O)C2=CC=CC=C21 ZJZLFDHSFOSUIJ-UHFFFAOYSA-N 0.000 claims description 3
- HDNIDWXLYXGKBI-UHFFFAOYSA-N 6-(2,2-dimethylpropoxy)-6-oxohexanoic acid Chemical compound CC(C)(C)COC(=O)CCCCC(O)=O HDNIDWXLYXGKBI-UHFFFAOYSA-N 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 4
- 238000003786 synthesis reaction Methods 0.000 claims 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 18
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 210000002700 urine Anatomy 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 6
- 238000010189 synthetic method Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 239000011162 core material Substances 0.000 description 53
- 239000010410 layer Substances 0.000 description 23
- 229920001131 Pulp (paper) Polymers 0.000 description 13
- 229920000642 polymer Polymers 0.000 description 8
- 239000012790 adhesive layer Substances 0.000 description 6
- 239000002250 absorbent Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 239000004831 Hot glue Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- PAALZGOZEUHCET-UHFFFAOYSA-N 1,4-dioxecane-5,10-dione Chemical compound O=C1CCCCC(=O)OCCO1 PAALZGOZEUHCET-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 239000008213 purified water Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002504 physiological saline solution Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 poly ethylene adipate Polymers 0.000 description 1
- 229920000921 polyethylene adipate Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- C08G18/40—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
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Hematology (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
The invention discloses a hydrophilic adhesive and a synthesis method and application thereof. The synthesis method comprises the following steps: the hydrophilic adhesive is formed by copolymerization reaction of a uniform mixed reaction system containing polyhydroxy polyether, polyhydroxy polyester and polyfunctional group isocyanate. The synthetic method of the hydrophilic adhesive is simple in process, and the obtained hydrophilic adhesive is coated on the wrapping layer of the non-woven fabric core body and then is attached to the core body. Because the adhesive is polar and hydrophilic, the wrapping layer of the non-woven fabric core body can still maintain certain hydrophilicity relative to a rubber adhesive after the core body absorbs urine and the hydrophilic agent of the wrapping layer of the non-woven fabric core body is eluted, so that the wrapping layer has better attaching and adhering properties to the core body material after water absorption, the core body after water absorption maintains certain physical wrapping property, the complete state of the core body can be maintained greatly, and the application prospect is wide.
Description
Technical Field
The invention relates to a hydrophilic adhesive, in particular to a hydrophilic adhesive applied to a paper diaper core formed by mixing wood pulp wrapped by non-woven fabrics and a water-absorbing polymer, a synthetic method and application thereof.
Background
A key component of the construction of infant or adult diapers is the core, which is capable of absorbing urine. The diaper manufacturer effectively mixes the water-absorbent resin and the wood pulp fiber in the production process, and takes the mixture of the water-absorbent resin and the wood pulp fiber as a core body. The traditional core body is a mixture of high-molecular water-absorbent resin and wood pulp fiber, and is integrated into a paper diaper structure after being wrapped by dust-free paper, non-woven fabric and the like after being formed. The core body wrapped by the non-woven fabric has the advantages of being softer and lighter compared with the core body wrapped by the dust-free paper. The non-woven fabric is bonded on the core body by using rubber-based hot melt adhesive to play a role in wrapping. However, the core wrapped by the non-woven fabric has a weak point that after urine is absorbed, the non-woven fabric and the rubber-based hot melt adhesive both show non-polar and non-hydrophilic performance because the hydrophilic treatment agent on the surface of the non-woven fabric fiber is eluted, so that the non-woven fabric and the rubber-based hot melt adhesive are difficult to be tightly attached to the wood pulp and the high-molecular water-absorbent resin of the core which absorb liquid. Thus, the wrapping layer no longer has a physical wrapping effect on the material of the core. The wood pulp and the water-absorbent resin of the core are in dispersed particles after absorbing water, and are very easy to disperse under the condition of failure of physical wrapping effect, so that the stacking phenomenon is generated, and the core is represented as a fault of the diaper core. It is a poor use experience for the user.
Disclosure of Invention
The invention mainly aims to provide a hydrophilic adhesive, a synthetic 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 synthetic method of a hydrophilic adhesive, which comprises the following steps: the hydrophilic adhesive is formed by copolymerization reaction of a uniform mixed reaction system containing polyhydroxy polyether, polyhydroxy polyester and polyfunctional group isocyanate.
In some embodiments, the polyhydroxy polyether comprises any one of, or a combination of two or more of, a difunctional polyethylene glycol, a difunctional polypropylene glycol, and a trifunctional polypropylene glycol.
In some embodiments, the polyhydroxy polyester comprises any one or a combination of two or more of difunctional poly (ethylene adipate glycol), difunctional poly (propylene adipate glycol), difunctional poly (neopentyl adipate glycol), difunctional poly (ethylene phthalate glycol), difunctional poly (propylene phthalate glycol), difunctional poly (neopentyl phthalate glycol).
Further, the polyfunctional isocyanate comprises MDI.
The embodiment of the invention also provides a hydrophilic adhesive synthesized by the method, which comprises a copolymer formed by copolymerization of polyhydroxy polyether, polyhydroxy polyester and polyfunctional isocyanate.
The embodiment of the invention also provides application of the hydrophilic adhesive in the field of manufacturing of baby or adult diapers.
Further, the application includes: and applying the hydrophilic adhesive to the non-woven fabric core body wrapping layer to enable the non-woven fabric core body wrapping layer to be attached to the core body.
Compared with the prior art, the invention has the advantages that:
the synthetic method of the hydrophilic adhesive provided by the invention is simple in process, and the obtained hydrophilic adhesive is coated on the wrapping layer of the non-woven fabric core body and then is attached to the core body. Because the adhesive is polar and hydrophilic, the wrapping layer of the non-woven fabric core body can still maintain certain hydrophilicity relative to a rubber adhesive after the core body absorbs urine and the hydrophilic agent of the wrapping layer of the non-woven fabric core body is eluted, so that the wrapping layer has better attaching and adhering properties to the core body material after water absorption, the core body after water absorption maintains certain physical wrapping property, and the complete state of the core body can be maintained greatly.
Detailed Description
As mentioned above, in view of the defects of the prior art, the inventors of the present invention have made extensive studies and practice to provide a hydrophilic adhesive, which is coated on a non-woven fabric wrapping layer and then attached to a core. Because the adhesive is polar and hydrophilic, the core body absorbs urine, and the hydrophilic agent of the non-woven fabric wrapping layer can still keep certain hydrophilicity of the wrapping layer relative to rubber adhesive after being eluted, so that the wrapping layer has certain attaching force to the core body, and the core body can be kept in a complete state. The technical solution, its implementation and principles, etc. will be further explained as follows.
In one aspect of the present invention, a method for synthesizing a hydrophilic adhesive, includes: the polar hydrophilic adhesive is formed by copolymerization reaction of a uniform mixed reaction system containing polyhydroxy polyether, polyhydroxy polyester and polyfunctional isocyanate.
In some embodiments, the polyhydroxy polyether includes any one or a combination of two or more of a difunctional polyethylene glycol, a difunctional polypropylene glycol, a trifunctional polypropylene glycol, and the like, but is not limited thereto.
Further, the mass average molecular weight of the polyhydroxy polyether is 1000-5000.
In some embodiments, the polyhydroxy polyester includes any one or combination of two or more of difunctional poly (ethylene adipate glycol), difunctional poly (propylene adipate glycol), difunctional poly (neopentyl adipate glycol), difunctional poly (ethylene phthalate glycol), difunctional poly (propylene phthalate glycol), difunctional poly (neopentyl phthalate) systems, and the like, but is not limited thereto.
Further, the mass average molecular weight of the polyhydroxy polyester is 1000-3000.
In some embodiments, the polyfunctional isocyanate is MDI, but is not limited thereto.
In some embodiments, the homogeneous mixed reaction system comprises the following components in percentage by mass: 25-65 wt% of polyhydroxy polyether, 29-60 wt% of polyhydroxy polyester and 6-15 wt% of MDI.
In some embodiments, the temperature of the copolymerization reaction is 60-160 ℃ and the time is 0.5-4 h.
As another aspect of the present invention, it relates to a hydrophilic adhesive synthesized by the foregoing method, which comprises a copolymer formed by copolymerization of a polyhydroxypolyether, a polyhydroxypolyester and a polyfunctional isocyanate.
Further, the viscosity of the hydrophilic adhesive is 500-20000 cps at 160 ℃.
In another aspect of the embodiments of the present invention, there is also provided a use of the hydrophilic adhesive in the field of making infant or adult diapers.
Further, the application includes: and applying the hydrophilic adhesive to the non-woven fabric core body wrapping layer to enable the non-woven fabric core body wrapping layer to be attached to the core body.
Still further, the application includes: and applying the hydrophilic adhesive to the non-woven fabric core wrapping layer by adopting any application method of glue scraping, glue dispensing, glue spraying and the like.
By the technical scheme, the synthetic method of the hydrophilic adhesive provided by the invention is simple in process, and the obtained hydrophilic adhesive is coated on the wrapping layer of the non-woven fabric core body and then is attached to the core body. Because the adhesive is polar and hydrophilic, the wrapping layer of the non-woven fabric core body can still maintain certain hydrophilicity relative to a rubber adhesive after the core body absorbs urine and the hydrophilic agent of the wrapping layer of the non-woven fabric core body is eluted, so that the wrapping layer has better attaching and adhering properties to the core body material after water absorption, the core body after water absorption maintains certain physical wrapping property, and the complete state of the core body can be maintained greatly.
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
100g of difunctional poly (ethylene adipate) polyester with the molecular weight of 3000, 180g of difunctional poly (ethylene glycol) polyether with the molecular weight of 3000, 30g of 3-functional poly (propylene glycol) polyether with the molecular weight of 5000, 30g of poly (ethylene phthalate) polyester with the molecular weight of 1600 and 35g of MDI are uniformly mixed and reacted for 1 hour at the temperature of 120 ℃.
The resultant hydrophilic adhesive of this example was tested to have a viscosity of 5600 at 160 ℃.
At 140 ℃, the synthetic product hydrophilic adhesive obtained in the embodiment is coated and glued on the surface of the non-woven fabric, and is attached to the surface of a core material formed by mixing wood pulp and water-absorbing polymer to form effective attachment.
Test example
Samples coated on the surface of the nonwoven fabric were also compared using a commercially available rubber-based hot melt adhesive, with a bond area of 5 cm by 5 cm, and poured onto the bond site using 150 ml of physiological saline. And after the physiological saline is completely absorbed, removing the bonded non-woven fabric.
On the surface coated with the rubber base, the wood pulp and the water-absorbing polymer adhered to the surface are easy to fall off after friction, but the hydrophilic adhesive of the embodiment is difficult to fall off after friction.
After wood pulp and water-absorbing polymers attached to the hydrophilic adhesive are completely removed, the two samples are attached to the surface of the water-absorbing core again, and after the two samples are uncovered again, the surfaces of the samples of the rubber-based adhesive are completely not attached to the wood pulp and the water-absorbing polymers. The surface of the hydrophilic adhesive of this embodiment is again adhered with wood pulp and water-absorbing polymer.
Therefore, the hydrophilic adhesive of the embodiment has better attaching and adhering performance to the core material after water absorption, so that a certain physical wrapping performance is kept for the core after water absorption, and the integrity of the core is maintained.
Example 2
100g of difunctional poly (ethylene adipate) polyester with the molecular weight of 3000, 40g of difunctional polyethylene glycol polyether with the molecular weight of 3000, 20g of 3-functional poly (propylene glycol) polyether with the molecular weight of 5000, 20g of difunctional polypropylene glycol polyether with the molecular weight of 4000 and 15g of MDI are uniformly mixed and reacted for 2 hours at the temperature of 90 ℃.
At 140 ℃, the synthetic product hydrophilic adhesive obtained in the embodiment is dispensed on the surface of the non-woven fabric by using a 0.6 mm needle head, and is attached to the surface of a core material formed by mixing wood pulp and water-absorbing polymer to form effective attachment.
Example 3
100g of difunctional ethylene adipate glycol polyester with molecular weight of 2000, 50g of difunctional propylene glycol polyether with molecular weight of 1000, 150g of 3-functional polypropylene glycol polyether with molecular weight of 5000 and 40g of MDI are uniformly mixed, reacted for 0.5 hour at 110 ℃, and then heated to 140 ℃ for reaction for 1 hour. The resulting adhesive can be coated on a substrate at 160 ℃. Purified water is dripped on the surface of the adhesive layer, and the water drops can be spread to wet the surface of the adhesive layer. The coated rubber-based adhesive does not spread on the surface of the water drop and is not wet.
Example 4
142g of difunctional poly (ethylene adipate) polyester with the molecular weight of 1000, 40g of difunctional polypropylene glycol polyether with the molecular weight of 4000, 20g of 3-functional poly (propylene glycol) polyether with the molecular weight of 5000 and 22g of MDI are uniformly mixed and reacted for 2 hours at the temperature of 100 ℃. The formed adhesive can be coated on a substrate at 120 ℃. Purified water is dripped on the surface of the adhesive layer, and the water drops can be spread to wet the surface of the adhesive layer. The coated rubber-based adhesive does not spread on the surface of the water drop and is not wet.
Example 5
85g of difunctional poly ethylene adipate polyester with molecular weight of 3000, 130g of difunctional poly propylene glycol polyether with molecular weight of 4000, 60g of 3-functional poly propylene glycol polyether with molecular weight of 5000 and 18g of MDI are uniformly mixed, reacted for 1 hour at 60 ℃, gradually heated to 140 ℃ and kept for 3 hours, and the formed adhesive can be coated on a substrate at 140 ℃. Purified water is dripped on the surface of the adhesive layer, and the water drops can be spread to wet the surface of the adhesive layer. The coated rubber-based adhesive does not spread on the surface of the water drop and is not wet.
Example 6
100g of difunctional poly (ethylene adipate) polyester with the molecular weight of 3000, 40g of difunctional polyethylene glycol polyether with the molecular weight of 3000, 20g of 3-functional poly (propylene glycol) polyether with the molecular weight of 5000, 20g of difunctional polypropylene glycol polyether with the molecular weight of 4000 and 15g of MDI are uniformly mixed and reacted for 0.5 hour at the temperature of 160 ℃.
At 140 ℃, the synthetic product hydrophilic adhesive obtained in the embodiment is dispensed on the surface of the non-woven fabric by using a 0.6 mm needle head, and is attached to the surface of a core material formed by mixing wood pulp and water-absorbing polymer to form effective attachment.
In summary, according to the above technical scheme of the present invention, the hydrophilic adhesive of the present invention is coated on the non-woven fabric wrapping layer and then attached to the core body. Because the adhesive is polar and hydrophilic, the core body absorbs urine, and the hydrophilic agent of the non-woven fabric wrapping layer can still keep certain hydrophilicity of the wrapping layer relative to rubber adhesive after being eluted, so that the wrapping layer has certain attaching force to the core body, the core body can be kept in a complete state, and the application prospect is wide.
In addition, the inventor also refers to the mode of examples 1-6, tests are carried out by using other raw materials and conditions listed in the specification, and the hydrophilic adhesive which is polar and hydrophilic, enables the wrapping layer to have certain attaching force to the core body, and enables the core body to have a larger possibility of keeping the complete state is 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 (10)
1. A method for synthesizing a hydrophilic adhesive is characterized by comprising the following steps: the hydrophilic adhesive is formed by copolymerization reaction of a uniform mixed reaction system containing polyhydroxy polyether, polyhydroxy polyester and polyfunctional group isocyanate.
2. The method of synthesis according to claim 1, characterized in that: the polyhydroxy polyether comprises any one or the combination of more than two of difunctional polyethylene glycol, difunctional polypropylene glycol and trifunctional polypropylene glycol; and/or the mass average molecular weight of the polyhydroxy polyether is 1000-5000.
3. The method of synthesis according to claim 1, characterized in that: the polyhydroxy polyester comprises any one or the combination of more than two of difunctional poly (ethylene adipate) glycol, difunctional poly (propylene adipate) glycol, difunctional poly (neopentyl adipate) glycol, difunctional poly (ethylene phthalate) glycol, difunctional poly (propylene phthalate) glycol and difunctional poly (neopentyl phthalate); and/or the mass average molecular weight of the polyhydroxy polyester is 1000-3000.
4. The method of synthesis according to claim 1, characterized in that: the polyfunctional isocyanate comprises MDI.
5. The synthesis method of claim 1, wherein the homogeneous mixing reaction system comprises the following components in percentage by mass: 25-65 wt% of polyhydroxy polyether, 29-60 wt% of polyhydroxy polyester and 6-15 wt% of MDI.
6. The method of synthesis according to claim 1, characterized in that: the temperature of the copolymerization reaction is 60-160 ℃, and the time is 0.5-4 h.
7. A hydrophilic adhesive synthesized by the method of any one of claims 1-6 comprising a copolymer formed by copolymerization of a polyhydroxy polyether, a polyhydroxy polyester, and a polyfunctional isocyanate.
8. The hydrophilic adhesive of claim 7, wherein: the viscosity of the hydrophilic adhesive is 500-20000 cps at 160 ℃.
9. Use of the hydrophilic adhesive of claim 7 or 8 in the field of baby or adult diaper manufacture.
10. The application according to claim 9, wherein the application comprises: applying the hydrophilic adhesive to the non-woven fabric core body wrapping layer to enable the non-woven fabric core body wrapping layer to be attached to the core body; preferably, the application comprises: and applying the hydrophilic adhesive on the non-woven fabric core wrapping layer by adopting any one of glue scraping, glue dispensing and glue spraying.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910167487.5A CN111662672A (en) | 2019-03-06 | 2019-03-06 | Hydrophilic adhesive and synthesis method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910167487.5A CN111662672A (en) | 2019-03-06 | 2019-03-06 | Hydrophilic adhesive and synthesis method and application thereof |
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| CN201910167487.5A Pending CN111662672A (en) | 2019-03-06 | 2019-03-06 | Hydrophilic adhesive and synthesis method and application thereof |
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| CN1325430A (en) * | 1998-11-03 | 2001-12-05 | 陶氏化学公司 | Hot-melt adhesive compositions |
| US20020120245A1 (en) * | 2001-02-20 | 2002-08-29 | Olle Carlbark | Diaper cover and method for manufacturing a diaper cover |
| CN101418192A (en) * | 2007-10-24 | 2009-04-29 | 天津大学 | Hydrophilicity hot melt type polyurethane contact adhesive and preparation method and use |
| CN101724372A (en) * | 2009-11-19 | 2010-06-09 | 北京高盟化工有限公司 | Preparation method of adhesive for solvent-free spinning composite |
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