CN113558873A - A absorb core and sanitary towel for sanitary towel - Google Patents
A absorb core and sanitary towel for sanitary towel Download PDFInfo
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- CN113558873A CN113558873A CN202110873544.9A CN202110873544A CN113558873A CN 113558873 A CN113558873 A CN 113558873A CN 202110873544 A CN202110873544 A CN 202110873544A CN 113558873 A CN113558873 A CN 113558873A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530437—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a part with elevated absorption means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530802—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterized by the foam or sponge other than superabsorbent
Abstract
The invention relates to the field of disposable sanitary products, and provides an absorption core body for a sanitary towel and the sanitary towel, wherein the absorption core body comprises a wrapping layer and a composite foaming material layer wrapped by the wrapping layer, the composite foaming material layer comprises an upper foaming material layer, a lower foaming material layer and a supporting layer, the supporting layer is arranged between the upper foaming material layer and the lower foaming material layer or below the lower foaming material layer, and the upper foaming material layer and the lower foaming material layer are prepared by emulsion polymerization, solidification and drying of the following raw material components.
Description
Technical Field
The invention relates to the field of disposable sanitary products, in particular to an absorption core body for a sanitary towel and the sanitary towel.
Background
The sanitary towel is an indispensable sanitary article for women in the physiological period and is used for absorbing menstrual blood flowing out from the vagina in the menstrual period of women. Conventional sanitary napkins generally comprise a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent core positioned between the liquid-permeable top sheet and the liquid-impermeable back sheet. The absorbent core is usually made of a material such as toilet paper or dust-free paper as a wrapping layer, and is wrapped with a mixture of fluff pulp and super absorbent resin, for example, chinese patent application No.: 201921425285.8 discloses a sanitary towel polymer absorbs core, sanitary towel polymer absorbs core includes the core body, the core body includes fluff pulp and the cladding is at the coating outside the fluff pulp, it has the polymer to absorb resin to mix in the fluff pulp, the core body has seted up the core hole through trompil equipment, can let the core body keep outside the sufficient absorbent capacity, greatly strengthen air permeability, can accelerate liquid absorption simultaneously, reduce sanitary towel's side leakage risk, thereby be of value to consumer physical and mental health, promote quality of life. However, the core has high gram weight, is easy to break and delaminate, is easy to deform after being extruded and has larger thickness.
Aiming at the problems, the industry improves products and provides respective solutions. Such as chinese patent application No.: 201621465869.4 discloses a sanitary napkin with a composite absorbent core, which comprises a main body, wherein the upper surface of the main body is provided with a mounting groove, the sanitary napkin with a composite absorbent core has a lower non-woven fabric layer, a mixture layer and an upper non-woven fabric layer which can expand after absorbing liquid, but because the lower non-woven fabric layer, the mixture layer and the upper non-woven fabric layer are of net structures, small net blocks of the composite core have small areas, and the small net blocks bear small force difference when being subjected to twisting force, and because the lower non-woven fabric layer, the mixture layer and the upper non-woven fabric layer are connected into a whole by sewing threads besides fibers of surface layer non-woven fabric and bottom layer non-woven fabric, the conditions of conglomeration, breakage and rolling are not easy to occur, and the sanitary napkin made of the composite absorbent core is not easy to conglomerate, The condition of breaking or rolling improves the comfort of the user.
Disclosure of Invention
Therefore, aiming at the content, the invention provides an absorption core body for a sanitary towel and the sanitary towel, which solve the problems that the absorption core body of the existing sanitary towel is easy to break, layer and deform and has larger thickness.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides an absorb core for sanitary towel, absorb core includes parcel layer and the compound expanded material layer by parcel layer parcel, compound expanded material layer includes expanded material layer, down expanded material layer and supporting layer, the supporting layer is located and is gone up between expanded material layer and the lower expanded material layer or locate the below of expanded material layer down, go up expanded material layer, down expanded material layer and make after emulsion polymerization, solidification, crowded water, the stoving by following raw materials component: isooctyl acrylate, isooctyl methacrylate, glycol dimethacrylate, Tween-80 and an initiator.
The further improvement is that: the pore diameter of the upper foaming material layer is 10-200 mu m, and the pore diameter of the lower foaming material layer is 1-60 mu m.
The further improvement is that: the supporting layer is any one of perforated non-woven fabrics, perforated composite non-woven fabrics, embossed three-dimensional perforated non-woven fabrics, ultrasonic embossed perforated non-woven fabrics, perforated PE films and perforated composite films.
The further improvement is that: the aperture of the supporting layer is 0.4-5mm, and the gram weight is 10-50 gsm.
The further improvement is that: the thickness of the upper foaming material layer is 0.2-4mm, the thickness of the lower foaming material layer is 0.2-3mm, and the thickness of the supporting layer is 0.1-3 mm.
The further improvement is that: the preparation method of the composite foaming material layer comprises the following steps:
(1) preparation of the lower foam layer:
a1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:50-70, stirring and mixing uniformly to form a first reactant, then adding tween-80 accounting for 14-20% of the mass of the first reactant, stirring and mixing uniformly to obtain an oil phase;
a2, preparation of an aqueous phase: taking a calcium chloride solution as a water phase, wherein the mass ratio of the water phase to an oil phase is 90-97: 3-10;
a3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a first emulsifying tank to form uniform emulsion, heating the emulsion to 70-90 ℃, adding an initiator accounting for 5-15% of the mass of the first reaction substance, and continuously heating to 90-110 ℃ to perform polymerization reaction;
(2) preparing an upper foaming material layer:
b1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:50-70, stirring and mixing uniformly to form a second reactant, then adding tween-80 accounting for 10-14% of the mass of the second reactant, stirring and mixing uniformly to obtain an oil phase;
b2, preparing a water phase: taking a calcium chloride solution as a water phase, wherein the mass ratio of the water phase to an oil phase is 90-97: 3-10;
b3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a second emulsifying tank to form uniform emulsion, heating the emulsion to 70-90 ℃, adding an initiator accounting for 5-15% of the mass of the second reaction substance, and continuously heating to 90-110 ℃ to perform polymerization reaction;
(3) and (3) curing: uniformly spraying the product obtained by the polymerization reaction in the step (1) on the upper surface of the supporting layer through a nozzle to form a lower foaming material layer, then uniformly spraying the product obtained by the polymerization reaction in the step (2) on the upper surface of the lower foaming material layer through the nozzle to form an upper foaming material layer, and sending the upper foaming material layer into a curing and forming chamber for curing;
or uniformly spraying the product obtained by the polymerization reaction in the step (1) on the lower surface of the supporting layer through a nozzle to form a lower foaming material layer, uniformly spraying the product obtained by the polymerization reaction in the step (2) on the upper surface of the supporting layer through a nozzle to form an upper foaming material layer, and then conveying the upper foaming material layer into a curing and forming chamber for curing;
(4) drying: and (4) drying the material cured in the step (3) in an oven device until the water content is within 10% to obtain a composite foaming material layer, wherein the drying temperature is 60-80 ℃.
The further improvement is that: the initiator is any one of di-tert-butyl peroxide and lauroyl peroxide or a mixture of the di-tert-butyl peroxide and the lauroyl peroxide mixed in any ratio.
The invention also discloses a sanitary towel which comprises a sanitary towel body, wherein the sanitary towel body comprises a liquid-permeable surface layer, a liquid-impermeable bottom layer and an absorption core body positioned between the liquid-permeable surface layer and the liquid-impermeable bottom layer which are sequentially stacked from top to bottom, the absorption core body comprises a wrapping layer and a composite foaming material layer wrapped by the wrapping layer, the composite foaming material layer comprises an upper foaming material layer, a lower foaming material layer and a supporting layer, a plurality of digging holes are formed in the middle area of the composite foaming material layer, the digging holes penetrate through the upper surface and the lower surface of the composite foaming material layer, each digging hole forms a downward permeation area, the wrapping layer comprises a first wrapping part positioned on the upper surface of the composite foaming material layer, and the first wrapping part is distributed on the peripheral side of the downward permeation area.
The further improvement is that: the holes are round holes with the diameter ranging from 1mm to 5mm or long holes with the length ranging from 5mm to 30 mm.
The further improvement is that: the area of the infiltration area accounts for 5-50% of the area of the composite foaming material layer.
By adopting the technical scheme, the invention has the beneficial effects that:
the existing sanitary towel is usually formed by mixing fluff pulp and high water-absorbing resin together, the structure of the absorbing layer made of the material is relatively loose, when the high water-absorbing resin absorbs and expands, and is extruded when a user moves, the absorbing layer is easy to have the phenomena of lumping, fracture layering, deformation and the like, in order to avoid the phenomena, the content of the fluff pulp needs to be increased, but the thickness of the absorbing layer is thicker. The invention takes the composite foaming material layer as the absorption layer in the absorption core body, thoroughly solves the defects of easy lumping, fracture delamination and easy deformation of the absorption core body of the prior sanitary towel, the composite foaming material layer comprises an upper foaming material layer, a lower foaming material layer and a supporting layer, the upper and lower foaming material layers can meet the requirement of water absorption capacity, and the supporting layer can improve the strength and toughness of the material and does not influence the capillary infiltration effect between the two foaming material layers.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of embodiment 2 of the present invention;
FIG. 3 is a schematic structural view of embodiment 6 of the present invention;
fig. 4 is a schematic structural view of a sanitary napkin body in example 6 of the present invention.
Detailed Description
The following detailed description will be provided for the embodiments of the present invention with reference to specific embodiments, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Unless otherwise indicated, the techniques employed in the examples are conventional and well known to those skilled in the art, and the reagents and products employed are also commercially available. The source, trade name and if necessary the constituents of the reagents used are indicated at the first appearance.
Example 1
Referring to fig. 1, an absorbent core for sanitary napkins, the absorbent core comprising a wrapping layer 1 and a composite foam layer 2 wrapped by the wrapping layer 1, the composite foam layer 2 comprising an upper foam layer 21, a lower foam layer 22 and a support layer 23, the support layer 23 being disposed between the upper foam layer 21 and the lower foam layer 22.
The supporting layer can be selected from a punched non-woven fabric, an embossed three-dimensional punched non-woven fabric, a punched PE film or a punched composite film, wherein the punched non-woven fabric can be a single-layer non-woven fabric or a composite non-woven fabric with a multi-layer structure. Three-dimensional punching non-woven fabrics of impressed watermark is carried out the knurling through roller or other modes and is punched the formation, for prior art, can specifically refer to application number: CN201621022310.4, CN 201710392335.6. The perforated composite film may be a composite structure composed of a plurality of PE films or a composite structure composed of a PE film and a nonwoven fabric. In this embodiment, the supporting layer is a perforated single-layer air-through nonwoven fabric. The pore size of the support layer is 0.4-5mm, such as 0.4mm, 0.8mm, 1.0mm, 1.5mm, 2mm, 3mm, 4mm, 5 mm. The grammage of the support layer is 10-50gsm, e.g. 10gsm, 20gsm, 30gsm, 40gsm, 50gsm, in this embodiment the pore size is 2mm and the grammage is 30 gsm.
The preparation method of the composite foaming material layer comprises the following steps:
(1) preparation of the lower foam layer:
a1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:50, stirring and mixing uniformly to form a first reactant, then adding tween-80 with the mass of 14% of the first reactant, stirring and mixing uniformly to obtain an oil phase;
a2, preparation of an aqueous phase: taking a calcium chloride solution with the concentration of 4 wt% as a water phase, wherein the mass ratio of the water phase to an oil phase is 90: 10;
a3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a first emulsifying tank to form uniform emulsion, heating the emulsion to 70 ℃, adding di-tert-butyl peroxide accounting for 5% of the mass of the first reactant, continuously heating to 90 ℃, and carrying out polymerization reaction for 8 hours;
(2) preparing an upper foaming material layer:
b1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:50, stirring and mixing uniformly to form a second reactant, then adding tween-80 accounting for 10% of the mass of the second reactant, stirring and mixing uniformly to obtain an oil phase;
b2, preparing a water phase: taking a calcium chloride solution with the concentration of 4 wt% as a water phase, wherein the mass ratio of the water phase to an oil phase is 90: 10;
b3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a second emulsifying tank to form uniform emulsion, heating the emulsion to 70 ℃, adding 5% of di-tert-butyl peroxide by mass of a second reaction substance, continuously heating to 90 ℃, and carrying out polymerization reaction for 8 hours;
(3) and (3) curing: uniformly spraying the product obtained by the polymerization reaction in the step (1) on the lower surface of the supporting layer through a nozzle to form a lower foaming material layer, uniformly spraying the product obtained by the polymerization reaction in the step (2) on the upper surface of the supporting layer through the nozzle to form an upper foaming material layer, and then conveying the upper foaming material layer into a curing and forming chamber for curing;
(4) drying: and (4) drying the material cured in the step (3) in an oven device until the water content is within 10% to obtain a composite foaming material layer, wherein the drying temperature is 60 ℃.
In the prepared composite foaming material layer, the thickness of the upper foaming material layer is 4mm, the thickness of the lower foaming material layer is 1.5mm, and the thickness of the supporting layer is 0.2 mm. The pore diameter of the upper foaming material layer is within the range of 10-200 mu m, and the pore diameter of the lower foaming material layer is within the range of 1-60 mu m.
Comparative example 1
The utility model provides an absorb core for sanitary towel, absorb core includes the composite foaming material layer of parcel layer and parcel layer parcel, composite foaming material layer 2 only includes the last foaming material layer and the lower foaming material layer that stack gradually the setting, does not include the supporting layer. The upper and lower foam layers were prepared according to the other method described in example 1.
Example 2
Referring to fig. 2, the absorbent core for the sanitary napkin comprises a wrapping layer 1 and a composite foam material layer 2 wrapped by the wrapping layer 1, wherein the composite foam material layer 2 comprises an upper foam material layer 21, a lower foam material layer 22 and a supporting layer 23 which are sequentially stacked. Otherwise, the same procedure as in example 1 was repeated.
Example 3
An absorbent core for a sanitary napkin, differing from example 1 in that: the supporting layer is a perforated PE film.
Example 4
The utility model provides an absorb core for sanitary towel, absorb core includes the parcel layer and by the compound expanded material layer of parcel layer parcel, compound expanded material layer is including the last expanded material layer, supporting layer and the lower expanded material layer that stack gradually the setting.
The preparation method of the composite foaming material layer comprises the following steps:
(1) preparation of the lower foam layer:
a1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:60, stirring and mixing uniformly to form a first reactant, then adding tween-80 accounting for 16% of the mass of the first reactant, stirring and mixing uniformly to obtain an oil phase;
a2, preparation of an aqueous phase: taking a calcium chloride solution with the concentration of 4 wt% as a water phase, wherein the mass ratio of the water phase to an oil phase is 94: 6;
a3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a first emulsifying tank to form uniform emulsion, heating the emulsion to 80 ℃, adding 10% of di-tert-butyl peroxide by mass of the first reactant, continuously heating to 100 ℃, and carrying out polymerization reaction for 6 hours;
(2) preparing an upper foaming material layer:
b1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:60, stirring and mixing uniformly to form a second reactant, then adding tween-80 with the mass of 16% of the second reactant, stirring and mixing uniformly to obtain an oil phase;
b2, preparing a water phase: taking a calcium chloride solution with the concentration of 4 wt% as a water phase, wherein the mass ratio of the water phase to an oil phase is 94: 6;
b3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a second emulsifying tank to form uniform emulsion, heating the emulsion to 80 ℃, adding 10% of di-tert-butyl peroxide by mass of a second reaction substance, continuously heating to 100 ℃, and carrying out polymerization reaction for 6 hours;
(3) and (3) curing: uniformly spraying the product obtained by the polymerization reaction in the step (1) on the lower surface of the supporting layer through a nozzle to form a lower foaming material layer, uniformly spraying the product obtained by the polymerization reaction in the step (2) on the upper surface of the supporting layer through the nozzle to form an upper foaming material layer, and then conveying the upper foaming material layer into a curing and forming chamber for curing;
(4) drying: and (4) drying the material cured in the step (3) in an oven device until the water content is within 10% to obtain a composite foaming material layer, wherein the drying temperature is 70 ℃.
In the prepared composite foaming material layer, the thickness of the upper foaming material layer is 2mm, the thickness of the lower foaming material layer is 0.5mm, and the thickness of the supporting layer is 1.5 mm. The pore diameter of the upper foaming material layer is within the range of 10-200 mu m, and the pore diameter of the lower foaming material layer is within the range of 1-60 mu m.
Example 5
The utility model provides an absorb core for sanitary towel, absorb core includes the parcel layer and by the compound expanded material layer of parcel layer parcel, compound expanded material layer is including the last expanded material layer, supporting layer and the lower expanded material layer that stack gradually the setting.
The preparation method of the composite foaming material layer comprises the following steps:
(1) preparation of the lower foam layer:
a1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:70, stirring and mixing uniformly to form a first reactant, then adding Tween-80 accounting for 20% of the mass of the first reactant, stirring and mixing uniformly to obtain an oil phase;
a2, preparation of an aqueous phase: taking a calcium chloride solution with the concentration of 4 wt% as a water phase, wherein the mass ratio of the water phase to an oil phase is 97: 3;
a3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a first emulsifying tank to form uniform emulsion, heating the emulsion to 90 ℃, adding lauroyl peroxide accounting for 15% of the mass of the first reaction substance, continuously heating to 110 ℃, and carrying out polymerization reaction for 4 hours;
(2) preparing an upper foaming material layer:
b1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:70, stirring and mixing uniformly to form a second reactant, then adding Tween-80 accounting for 20% of the mass of the second reactant, stirring and mixing uniformly to obtain an oil phase;
b2, preparing a water phase: taking a calcium chloride solution with the concentration of 4 wt% as a water phase, wherein the mass ratio of the water phase to an oil phase is 97: 3;
b3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a second emulsifying tank to form uniform emulsion, heating the emulsion to 90 ℃, adding lauroyl peroxide accounting for 15% of the mass of a second reaction substance, continuously heating to 110 ℃, and carrying out polymerization reaction for 4 hours;
(3) and (3) curing: uniformly spraying the product obtained by the polymerization reaction in the step (1) on the lower surface of the supporting layer through a nozzle to form a lower foaming material layer, uniformly spraying the product obtained by the polymerization reaction in the step (2) on the upper surface of the supporting layer through the nozzle to form an upper foaming material layer, and then conveying the upper foaming material layer into a curing and forming chamber for curing;
(4) drying: and (4) drying the material cured in the step (3) in an oven device until the water content is within 10% to obtain a composite foaming material layer, wherein the drying temperature is 80 ℃.
In the prepared composite foaming material layer, the thickness of the upper foaming material layer is 0.5mm, the thickness of the lower foaming material layer is 3mm, and the thickness of the supporting layer is 3 mm. The pore diameter of the upper foaming material layer is within the range of 10-200 mu m, and the pore diameter of the lower foaming material layer is within the range of 1-60 mu m.
Example 6
Referring to fig. 3, a sanitary napkin comprises a sanitary napkin body 3, wings 4 are symmetrically arranged on two sides of the middle of the sanitary napkin body 3, and the sanitary napkin body 3 comprises a liquid-permeable surface layer 5, a liquid-impermeable bottom layer 6 and an absorbing core 7 between the liquid-permeable surface layer 5 and the liquid-impermeable bottom layer 6, which are sequentially stacked from top to bottom. The absorbing core body comprises a wrapping layer and a composite foaming material layer wrapped by the wrapping layer, the structure is shown in figure 1 and figure 2, a plurality of digging holes 8 are formed in the middle area of the composite foaming material layer, the digging holes 8 penetrate through the upper surface and the lower surface of the composite foaming material layer, each digging hole 8 forms an infiltration area, the wrapping layer comprises a first wrapping part 9 located on the upper surface of the composite foaming material layer, and the first wrapping part 9 is distributed on the periphery side of the infiltration area.
The hole may be a circular hole with a diameter of 1-5mm, for example 1mm, 2mm, 3mm, 4mm, 5 mm. It may also be a slot of length 5-30mm, for example 5mm, 10mm, 15mm, 20mm, 25mm, 30 mm. In the embodiment, the shape of the dug hole is circular, and the aperture is 3 mm.
The area of the holes accounts for 5-50% of the area of the composite foam material layer, for example, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, and the absorbent core prepared in this range can achieve the desired technical effect, i.e., accelerate the infiltration of menstrual blood, and simultaneously ensure the strength and absorption capacity of the absorbent core, and the area of the holes accounts for 20% of the area of the composite foam material layer in this embodiment.
The supporting layer of the invention is not limited to the structure of the perforated non-woven fabric, embossed three-dimensional perforated non-woven fabric, perforated PE film or perforated composite film, and can also improve the strength and toughness of the material without perforation. The wrapping layer of the present invention is not limited to the structure in which the composite foamed material layer is fully wrapped as described in the embodiment, and may be a structure in which the composite foamed material layer is C-wrapped, or a structure in which only the upper and lower surfaces of the composite foamed material layer are wrapped.
A sample of the composite foamed material layer obtained in examples 1 to 5 was cut into a width of 25mm, and the longitudinal tensile strength (MD direction) thereof was measured by a tensile machine, and the test results are shown in Table 1.
| Longitudinal breaking force (N/25mm) | |
| Example 1 | 11.0 |
| Example 2 | 10.2 |
| Example 3 | 8.5 |
| Example 4 | 11.6 |
| Example 5 | 12.4 |
| Comparative example 1 | 3.0 |
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (10)
1. An absorbent core for a sanitary napkin characterized by: the absorbing core body comprises a wrapping layer and a composite foaming material layer wrapped by the wrapping layer, the composite foaming material layer comprises an upper foaming material layer, a lower foaming material layer and a supporting layer, the supporting layer is arranged between the upper foaming material layer and the lower foaming material layer or below the lower foaming material layer, and the upper foaming material layer and the lower foaming material layer are prepared from the following raw material components through emulsion polymerization, curing and drying: isooctyl acrylate, isooctyl methacrylate, glycol dimethacrylate, Tween-80 and an initiator.
2. An absorbent core for a sanitary napkin as claimed in claim 1, wherein: the pore diameter of the upper foaming material layer is 10-200 mu m, and the pore diameter of the lower foaming material layer is 1-60 mu m.
3. An absorbent core for a sanitary napkin as claimed in claim 1, wherein: the supporting layer is any one of perforated non-woven fabrics, embossed three-dimensional perforated non-woven fabrics, perforated PE films and perforated composite films.
4. An absorbent core for a sanitary napkin as claimed in claim 3, wherein: the aperture of the supporting layer is 0.4-5mm, and the gram weight is 10-50 gsm.
5. An absorbent core for a sanitary napkin as claimed in claim 1, wherein: the thickness of the upper foaming material layer is 0.2-4mm, the thickness of the lower foaming material layer is 0.2-3mm, and the thickness of the supporting layer is 0.1-3 mm.
6. An absorbent core for a sanitary napkin as claimed in claim 1, wherein: the preparation method of the composite foaming material layer comprises the following steps:
(1) preparation of the lower foam layer:
a1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:50-70, stirring and mixing uniformly to form a first reactant, then adding tween-80 accounting for 14-20% of the mass of the first reactant, stirring and mixing uniformly to obtain an oil phase;
a2, preparation of an aqueous phase: taking a calcium chloride solution as a water phase, wherein the mass ratio of the water phase to an oil phase is 90-97: 3-10;
a3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a first emulsifying tank to form uniform emulsion, heating the emulsion to 70-90 ℃, adding an initiator accounting for 5-15% of the mass of the first reaction substance, and continuously heating to 90-110 ℃ to perform polymerization reaction;
(2) preparing an upper foaming material layer:
b1, preparing an oil phase: weighing isooctyl acrylate, isooctyl methacrylate and ethylene glycol dimethacrylate according to the mass ratio of 50:50:50-70, stirring and mixing uniformly to form a second reactant, then adding tween-80 accounting for 10-14% of the mass of the second reactant, stirring and mixing uniformly to obtain an oil phase;
b2, preparing a water phase: taking a calcium chloride solution as a water phase, wherein the mass ratio of the water phase to an oil phase is 90-97: 3-10;
b3, emulsion polymerization: fully stirring the oil phase and the water phase obtained in the step in a second emulsifying tank to form uniform emulsion, heating the emulsion to 70-90 ℃, adding an initiator accounting for 5-15% of the mass of the second reaction substance, and continuously heating to 90-110 ℃ to perform polymerization reaction;
(3) and (3) curing: uniformly spraying the product obtained by the polymerization reaction in the step (1) on the upper surface of the supporting layer through a nozzle to form a lower foaming material layer, then uniformly spraying the product obtained by the polymerization reaction in the step (2) on the upper surface of the lower foaming material layer through the nozzle to form an upper foaming material layer, and sending the upper foaming material layer into a curing and forming chamber for curing;
or uniformly spraying the product obtained by the polymerization reaction in the step (1) on the lower surface of the supporting layer through a nozzle to form a lower foaming material layer, uniformly spraying the product obtained by the polymerization reaction in the step (2) on the upper surface of the supporting layer through a nozzle to form an upper foaming material layer, and then conveying the upper foaming material layer into a curing and forming chamber for curing;
(4) drying: and (4) drying the material cured in the step (3) in an oven device until the water content is within 10% to obtain a composite foaming material layer, wherein the drying temperature is 60-80 ℃.
7. An absorbent core for a sanitary napkin as claimed in any one of claims 1 to 6, wherein: the initiator is any one of di-tert-butyl peroxide and lauroyl peroxide or a mixture of the di-tert-butyl peroxide and the lauroyl peroxide mixed in any ratio.
8. The utility model provides a sanitary towel, includes the sanitary towel body, the sanitary towel body includes from top to bottom stacks gradually the liquid permeability surface course, the liquid-tight nature bottom that sets up and is located the absorption core between liquid permeability surface course and the liquid-tight bottom, its characterized in that: the absorbent core for the sanitary napkin according to any one of claims 1 to 7, wherein the central region of the composite foam layer is provided with a plurality of cut holes penetrating the upper surface and the lower surface of the composite foam layer, each of the cut holes forms an infiltration region, and the cover comprises a first cover portion located on the upper surface of the composite foam layer, and the first cover portion is arranged on the periphery of the infiltration region.
9. A sanitary napkin as claimed in claim 8, wherein: the holes are round holes with the diameter ranging from 1mm to 5mm or long holes with the length ranging from 5mm to 30 mm.
10. A sanitary napkin as claimed in claim 8, wherein: the area of the digging holes accounts for 5-50% of the area of the composite foaming material layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110873544.9A CN113558873A (en) | 2021-07-30 | 2021-07-30 | A absorb core and sanitary towel for sanitary towel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110873544.9A CN113558873A (en) | 2021-07-30 | 2021-07-30 | A absorb core and sanitary towel for sanitary towel |
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| CN113558873A true CN113558873A (en) | 2021-10-29 |
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| CN202110873544.9A Pending CN113558873A (en) | 2021-07-30 | 2021-07-30 | A absorb core and sanitary towel for sanitary towel |
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Application publication date: 20211029 |