CN116763969A - Sanitary towel with high absorption speed and preparation method thereof - Google Patents
Sanitary towel with high absorption speed and preparation method thereof Download PDFInfo
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- CN116763969A CN116763969A CN202211443779.5A CN202211443779A CN116763969A CN 116763969 A CN116763969 A CN 116763969A CN 202211443779 A CN202211443779 A CN 202211443779A CN 116763969 A CN116763969 A CN 116763969A
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 34
- 239000010410 layer Substances 0.000 claims abstract description 143
- 229920002101 Chitin Polymers 0.000 claims abstract description 114
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims abstract description 95
- 239000000835 fiber Substances 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 230000006103 sulfonylation Effects 0.000 claims abstract description 36
- 238000005694 sulfonylation reaction Methods 0.000 claims abstract description 36
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000002344 surface layer Substances 0.000 claims abstract description 18
- 229920000297 Rayon Polymers 0.000 claims abstract description 15
- 229920002994 synthetic fiber Polymers 0.000 claims abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 239000007788 liquid Substances 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 39
- 239000000243 solution Substances 0.000 claims description 39
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 21
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 20
- YYROPELSRYBVMQ-UHFFFAOYSA-N 4-toluenesulfonyl chloride Chemical compound CC1=CC=C(S(Cl)(=O)=O)C=C1 YYROPELSRYBVMQ-UHFFFAOYSA-N 0.000 claims description 18
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 17
- 239000002244 precipitate Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- KJJPESOHTCIVIS-UHFFFAOYSA-N 2-chloroacetic acid propan-2-ol Chemical compound C(C)(C)O.ClCC(=O)O KJJPESOHTCIVIS-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 230000002745 absorbent Effects 0.000 claims description 8
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- 238000002166 wet spinning Methods 0.000 claims description 6
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical group [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 5
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 5
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 5
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 5
- 239000001099 ammonium carbonate Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 claims description 5
- 229940106681 chloroacetic acid Drugs 0.000 claims description 5
- 238000007731 hot pressing Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 5
- 239000004753 textile Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
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- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 3
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- HDECRAPHCDXMIJ-UHFFFAOYSA-N 2-methylbenzenesulfonyl chloride Chemical compound CC1=CC=CC=C1S(Cl)(=O)=O HDECRAPHCDXMIJ-UHFFFAOYSA-N 0.000 description 1
- RNIHAPSVIGPAFF-UHFFFAOYSA-N Acrylamide-acrylic acid resin Chemical compound NC(=O)C=C.OC(=O)C=C RNIHAPSVIGPAFF-UHFFFAOYSA-N 0.000 description 1
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- Absorbent Articles And Supports Therefor (AREA)
Abstract
The application relates to the field of female sanitary products, and particularly discloses a sanitary towel with high absorption speed and a preparation method thereof. The sanitary towel comprises a surface layer, a flow guide layer, a water absorption core and a waterproof bottom film which are sequentially arranged, wherein the flow guide layer comprises an upper hydrophilic layer and an anti-reverse osmosis layer, the upper hydrophilic layer is attached to the surface layer, the anti-reverse osmosis layer is attached to the water absorption core, the upper hydrophilic layer is made of modified sulfonylation carboxymethyl chitin fibers, and the anti-reverse osmosis layer is made of viscose fibers; the sulfonylated carboxymethyl chitin fiber is prepared from artificial fiber, sulfonylated carboxymethyl chitin and pore-forming agent; the preparation method comprises the following steps: preparing an upper hydrophilic layer; preparing a diversion layer; sanitary towel preparation. The application has the advantages of strong flow conductivity and quick and dry sanitary towel surface; solves the technical problem that the absorption speed of the sanitary towel is not fast enough.
Description
Technical Field
The application relates to the technical field of female sanitary products, in particular to a sanitary towel with high absorption speed and a preparation method thereof.
Background
Sanitary napkins are sanitary products with liquid absorbing function used by women during menstruation, and various sanitary napkin products with basic liquid absorbing function are already stored in the market along with the continuous development of the field of sanitary products. During menstruation, the slow absorption of menstrual fluid can lead to the skin of the sensitive part being in a moist state for a long time, and thus being easily damaged. The absorption speed of the menstrual fluid is closely related to the material structure of the surface layer and the water guiding capability of the water guiding layer.
At present, the common way to improve the liquid absorbing capacity of the sanitary towel is to increase the liquid absorbing amount of the water absorbing layer, manufacture a macromolecule resin water absorbing core and the like, and domestic research data on the water absorbing layer of the sanitary towel are rich, but the progress of unilaterally improving the water storing amount of the water absorbing layer is obviously limited. If the liquid absorption speed of the sanitary towel product is increased, the flow guiding rate of the flow guiding layer is also very important. But domestic studies on the baffle layer of sanitary napkins are relatively few. Therefore, the research on the diversion rate of the diversion layer has important significance for solving the problem that the absorption speed of the sanitary towel is not fast enough.
Disclosure of Invention
The application provides a sanitary towel with high absorption speed and a preparation method thereof, aiming at solving the problem that the sanitary towel is easy to be damaged due to insufficient dryness of skin at a sensitive part of a female caused by low absorption speed.
In a first aspect, the present application provides a sanitary napkin with a fast absorption rate, which adopts the following technical scheme:
a sanitary towel with high absorption speed comprises a surface layer, a diversion layer, a water absorption core and a waterproof bottom film which are sequentially arranged, wherein the diversion layer comprises an upper hydrophilic layer and an anti-reverse osmosis layer, the upper hydrophilic layer is made of sulfonylation carboxymethyl chitin fibers, and the anti-reverse osmosis layer is made of viscose fibers; the sulfonylation carboxymethyl chitin fiber is prepared from artificial fiber, sulfonylation carboxymethyl chitin and pore-forming agent.
By adopting the scheme, the lower anti-reverse osmosis layer prepared by adopting the viscose fiber has a slightly compact texture compared with the upper hydrophilic layer. The upper hydrophilic layer and the lower hydrophilic layer can form a flow guiding layer with a fluffy upper part and a slightly compact lower part, so that the difference of hygroscopicity of the upper layer and the lower layer of fibers achieves a differential capillary effect, so that liquid contacting the upper hydrophilic layer can rapidly pass through the flow guiding layer, thereby playing a role in rapid flow guiding and resisting reverse osmosis of the liquid.
And pore-forming agents are added in the preparation of the upper hydrophilic layer to form pores, so that the fluffiness of the upper hydrophilic layer is increased, the hygroscopicity difference of the upper hydrophilic layer and the anti-reverse osmosis layer is enhanced, driving force is provided for the diversion effect of the diversion layer, and the rapid diversion effect is improved.
In addition, the introduction of sulfonyl and carboxymethyl in the upper hydrophilic layer of the sulfonylated carboxymethyl chitin not only realizes the hydrophilic modification of chitin, but also can lead the modified carboxymethyl chitin to have heparinoid anticoagulation, effectively prevent blood coagulation from blocking pores, ensure the downward permeation of Cheng Tongchang of liquid, be more beneficial to rapid diversion and improve the diversion rate of a diversion layer.
Optionally, the sulfonylation carboxymethyl chitin fiber is prepared from the following raw materials in parts by weight:
18-24 parts of sulfonylation carboxymethyl chitin, 70-80 parts of artificial fiber and 6-10 parts of pore-forming agent.
Optionally, the preparation method of the sulfonylation carboxymethyl chitin comprises the following steps: weighing 40-50 parts of carboxymethyl chitin, dissolving in a sodium hydroxide solution, mixing and stirring for 2-3 hours, adding 100-150 parts of ice cubes, stirring the mixture to obtain a clarified liquid, cooling in an ice bath, dropwise adding a chloroform solution in which 125-175 parts of p-toluenesulfonyl chloride is dissolved, carrying out ice bath reaction for 2-3 hours, then reacting at room temperature for 2-3 hours, finally pouring the reaction solution into water, collecting precipitate, washing the precipitate with water to be neutral, washing the precipitate with ethanol, and drying to obtain the sulfonylated carboxymethyl chitin.
By adopting the technical scheme, the ordered structure among macromolecules of the carboxymethyl chitin can lead the chain to have large regularity and rigidity. Adding alkali solution with a certain concentration, and generating alkalized carboxymethyl chitin through alkali absorption and diffusion of carboxymethyl chitin. In the alkalization process, the carboxymethyl chitin is puffed, the diffusion channel in the crystallization area is opened, the reaction performance is activated, and the sulfonylation of C6 and C3 hydroxyl groups on the carboxymethyl chitin by the toluenesulfonyl chloride is more facilitated.
Optionally, the preparation method of the carboxymethyl chitin comprises the following steps: mixing 10-15 parts of chitin, 100-150 parts of sodium hydroxide aqueous solution and 0.04-0.05 part of sodium dodecyl sulfate uniformly, stirring in a water bath at 20-25 ℃ for 20-25 hours under the protection of nitrogen and in a dark condition, filtering, removing redundant sodium hydroxide solution, adding 125-150 parts of isopropanol into residues, stirring uniformly, dissolving 75-80 parts of chloroacetic acid into 93-100 parts of isopropanol to obtain chloroacetic acid isopropanol solution, dropwise adding chloroacetic acid isopropanol solution at 8-12 ℃ for reaction for 6-8 hours, and heating to 12-16 ℃ for reaction for 20-24 hours after the completion of dropwise adding.
Preferably, the pore-forming agent is ammonium bicarbonate.
By adopting the technical scheme, the pore-forming agent occupies a place in a solid form in the fiber forming process, the pore-forming agent which is easy to volatilize is selected, a pore structure is gradually formed along with the change of temperature, the fluffiness of the fiber layer is enhanced, the fiber structure with pores forms a fluffy upper hydrophilic layer, and the porous upper hydrophilic layer has a moisture absorption difference with viscose fibers, so that a driving force is provided for the diversion layer. Ammonium bicarbonate is selected as a pore-forming agent, and compared with other pore-forming agents, the catalyst only needs to change the temperature to 50 ℃ in the volatilizing process, and the reaction condition is milder.
Preferably, bamboo fibers are used as the facing material.
By adopting the technical scheme, the surface layer material is natural and skin-friendly, has good strength, is resistant to contact and is not easy to damage.
In a second aspect, the present application provides a method for preparing a sanitary towel with a high water absorption rate, which adopts the following technical scheme:
a preparation method of a sanitary towel with high absorption speed comprises the following steps:
s1, preparing an upper hydrophilic layer: mixing a man-made fiber raw material and a sulfonylation carboxymethyl chitin fiber part, dissolving the mixture in an organic solvent NMP, adding a pore-forming agent, and preparing a sulfonylation carboxymethyl chitin fiber layer by adopting a wet spinning method; after textile forming, volatilizing for 1-2h at the constant temperature of 50-55 ℃ to prepare an upper hydrophilic layer formed by sulfonylation carboxymethyl chitin fiber;
s2, preparing a diversion layer: the upper hydrophilic layer formed by the sulfonylation carboxymethyl chitin fiber and the anti-reverse osmosis layer formed by the viscose fiber are respectively 1 (0.8-1.2) by weight parts and pressed into a diversion layer by a hot air penetrating and bonding method;
s3, preparing a sanitary towel: the surface layer, the diversion layer, the water absorption core and the seepage-proof bottom film are combined into the sanitary towel by hot pressing from bottom to top. In summary, the application has the following beneficial effects:
1. in the application, the pore-forming agent ammonium bicarbonate is preferably adopted, and the upper hydrophilic layer becomes fluffy due to the fact that occupied pores are left in the fiber layer after volatilization, so that the upper hydrophilic layer and the lower anti-reverse osmosis layer have obvious hydroscopic difference effects.
2. The modified sulfonylation carboxymethyl chitin fiber is used as the upper hydrophilic layer, the viscose fiber is made into the anti-reverse osmosis layer, and the upper and lower layers of fibers have different hygroscopicity to achieve the differential capillary effect, so that the effects of rapid diversion and anti-liquid reverse osmosis are achieved.
3. According to the method, the liquid is quickly conducted inwards from the surface layer by using the diversion layer with the structure, so that the liquid longitudinally diffuses and quickly leaves the surface layer and the skin, the technical problem of low absorption speed of the sanitary towel is solved, and the effect of improving the absorption speed of the sanitary towel is achieved.
4. According to the application, through the sulfonylation modification of the carboxymethyl chitin, not only is the hydrophilic modification of the chitin realized, but also the modified carboxymethyl chitin can have heparinoid anticoagulation effect by utilizing the introduced sulfonyl, so that the pores are effectively prevented from being blocked by blood coagulation, the downward permeation of liquid is ensured to Cheng Tongchang, the rapid diversion is facilitated, and the diversion rate of the diversion layer is improved.
Detailed Description
Examples the application is further described in detail with particular reference to the following examples: the following examples, in which no specific conditions are noted, are conducted under conventional conditions or conditions recommended by the manufacturer, and the raw materials used in the following examples are commercially available from ordinary sources except for the specific descriptions.
The application provides a preparation method of a sanitary towel with high absorption speed, which comprises the following steps:
preparation of sulfonylated carboxymethyl chitin: weighing 40-50 parts of carboxymethyl chitin, dissolving in a sodium hydroxide solution, mixing and stirring for 2-3 hours, adding 100-150 parts of ice cubes, stirring the mixture to obtain a clarified liquid, cooling in an ice bath, dropwise adding a chloroform solution in which 125-175 parts of p-toluenesulfonyl chloride is dissolved, carrying out ice bath reaction for 2-3 hours, then reacting at room temperature for 2-3 hours, finally pouring the reaction solution into water, collecting precipitate, washing the precipitate with water to be neutral, washing the precipitate with ethanol, and drying to obtain the sulfonylated carboxymethyl chitin.
Preparing an upper hydrophilic layer: 70-80 parts of artificial fiber raw material and 18-24 parts of sulfonylation carboxymethyl chitin fiber are mixed and dissolved in 100-150 parts of organic solvent NMP. 6-10 parts of pore-forming agent is added, and the sulfonylation carboxymethyl chitin fiber layer is prepared by adopting a wet spinning method. After textile forming, volatilizing for 1-2h at the constant temperature of 50-55 ℃ to prepare an upper hydrophilic layer formed by sulfonylation carboxymethyl chitin fiber.
Preparing a diversion layer: the upper hydrophilic layer formed by the sulfonylation carboxymethyl chitin fiber and the anti-reverse osmosis layer formed by the viscose fiber are pressed into a diversion layer by a hot air penetrating and bonding method according to the weight part of 1 (0.8-1.2). The sanitary towel is prepared by the following steps: the surface layer, the diversion layer, the water absorption core and the seepage-proof bottom film are combined into the sanitary towel by hot pressing from bottom to top. The following is a detailed description of specific embodiments.
The following preparation examples 1 to 3 are preparation examples of carboxymethyl chitin
Preparation example 1
The preparation method of carboxymethyl chitin comprises the following steps:
10kg of 60-mesh chitin, 100kg of 40% sodium hydroxide aqueous solution and 0.04kg of sodium dodecyl sulfate are uniformly mixed, stirred in a water bath at 20 ℃ for 20 hours under the protection of nitrogen and in a dark condition, suction filtration is carried out, 125kg of isopropanol is added into the residue to be uniformly stirred to obtain a mixture, 75kg of chloroacetic acid is dissolved in 93kg of isopropanol to obtain chloroacetic acid isopropanol solution, the mixture is kept at 8 ℃, chloroacetic acid isopropanol solution is dropwise added into the mixture for reaction for 8 hours, and the temperature is raised to 12 ℃ for reaction for 24 hours after the completion of the dropwise addition.
Preparation example 2
Mixing 12kg of 70-mesh chitin, 125kg of 40% sodium hydroxide aqueous solution and 0.045kg of sodium dodecyl sulfate uniformly, stirring in a water bath at 22 ℃ for 23 hours under the protection of nitrogen and in a dark condition, carrying out suction filtration, removing redundant sodium hydroxide solution, adding 135kg of isopropanol into the residue, stirring uniformly to obtain a mixture, dissolving 77kg of chloroacetic acid in 96kg of isopropanol to obtain chloroacetic acid isopropanol solution, keeping the mixture at 10 ℃, dropwise adding chloroacetic acid isopropanol solution into the mixture for reaction for 7 hours, and heating to 14 ℃ for reaction for 22 hours after the completion of dropwise adding.
Preparation example 3
Mixing 15kg of 80-mesh chitin, 150kg of 40% sodium hydroxide aqueous solution and 0.05kg of sodium dodecyl sulfate uniformly, stirring in a water bath at 25 ℃ for 25 hours under the protection of nitrogen and in a dark condition, filtering, removing redundant sodium hydroxide solution, adding 150kg of isopropanol into the residue, stirring uniformly to obtain a mixture, dissolving 80kg of chloroacetic acid in 100kg of isopropanol to obtain chloroacetic acid isopropanol solution, keeping the mixture at 12 ℃, dropwise adding chloroacetic acid isopropanol solution into the mixture for reaction for 8 hours, and heating to 16 ℃ for reaction for 24 hours after the dropwise adding is completed.
Examples
Example 1
A preparation method of a sanitary towel with high absorption speed comprises the following steps:
s1, preparing an upper hydrophilic layer:
s1-1, weighing 40g of carboxymethyl chitin prepared in preparation example 1, dissolving in 0.1mol/L sodium hydroxide solution, wherein the mass ratio of the volume consumption of the sodium hydroxide solution to the carboxymethyl chitin is 50ml:10g, mixing and stirring for 2 hours, adding 100g of ice cubes, stirring the mixture to obtain a clarified liquid, cooling in an ice bath, dropwise adding a chloroform solution in which 125g of p-toluenesulfonyl chloride is dissolved for ice bath reaction for 2 hours (125 g of p-toluenesulfonyl chloride is dissolved in 400ml of chloroform solution and then dropwise added), then reacting at room temperature for 2 hours, finally pouring the reaction solution into water, collecting a precipitate, washing with water to be neutral, washing with ethanol, and drying to obtain sulfonylated carboxymethyl chitin.
S1-2, 18g of the sulfonylated carboxymethyl chitin prepared in S1-1 and 70g of ES fiber raw material are mixed and dissolved in 100g of NMP. Adding 6g of pore-forming agent ammonium bicarbonate, stirring, preparing a sulfonylation carboxymethyl chitin fiber layer by adopting a wet spinning method, volatilizing for 2 hours at a constant temperature of 50 ℃ after spinning and forming, and preparing an upper hydrophilic layer formed by the sulfonylation carboxymethyl chitin fiber;
s2, preparing a diversion layer:
the upper hydrophilic layer formed by the sulfonylation carboxymethyl chitin fiber and the anti-reverse osmosis layer formed by the viscose fiber are pressed into a diversion layer by a hot air penetrating and bonding method according to the weight g of 1:0.8.
S3, preparing a sanitary towel: according to the surface layer, the diversion layer, the water absorption core and the anti-seepage bottom film are attached from bottom to top, the upper hydrophilic layer is attached to the surface layer, the anti-seepage layer is attached to the water absorption core, and the sanitary towel is formed by combining the surface layer with the water absorption core through hot pressing, wherein the surface layer is made of bamboo fibers, the water absorption core is made of acrylic acid-acrylamide copolymer fibers, and the anti-seepage bottom film is a PE film.
Example 2
A method for producing a sanitary napkin having a high absorption rate was carried out in the same manner as in example 1, except that,
s1, preparing an upper hydrophilic layer:
s1-1, weighing 45g of carboxymethyl chitin prepared in preparation example 2, dissolving in 0.1mol/L sodium hydroxide solution, wherein the mass ratio of the volume consumption of the sodium hydroxide solution to the carboxymethyl chitin is 55ml:10g, mixing and stirring for 2.5 hours, adding 125g of ice cubes, stirring the mixture to obtain a clarified liquid, cooling in an ice bath, dropwise adding a chloroform solution in which 1g of p-toluenesulfonyl chloride is dissolved for 2.5 hours (150 g of p-toluenesulfonyl chloride is dissolved in 400ml of chloroform solution and then dropwise added), reacting at room temperature for 2.5 hours, finally pouring the reaction solution into water, collecting a precipitate, washing the precipitate with water to be neutral, washing the precipitate with ethanol, and drying to obtain the sulfonylated carboxymethyl chitin.
S1-2, 21g of the sulfonylated carboxymethyl chitin prepared in S1-1 and 75g of ES fiber raw material are mixed and dissolved in 125g of organic solvent NMP. 8g of pore-forming agent is added, stirred, and then the sulfonylation carboxymethyl chitin fiber layer is prepared by adopting a wet spinning method. After textile molding, volatilizing for 1.5h at constant temperature of 52 ℃ to prepare an upper hydrophilic layer composed of sulfonylation carboxymethyl chitin fiber.
S2, preparing a diversion layer: and pressing an upper hydrophilic layer formed by sulfonylation carboxymethyl chitin fibers and an anti-reverse osmosis layer formed by viscose fibers into a diversion layer by a hot air penetrating and bonding method according to the weight g of 1:1.
Example 3
A preparation method of a sanitary towel with high absorption speed is carried out according to the method in the example 1, and is characterized in that S1-1 is prepared by weighing 50g of carboxymethyl chitin prepared in the preparation example 3, and dissolving the carboxymethyl chitin in 0.1mol/L sodium hydroxide solution, wherein the mass ratio of the volume consumption of the sodium hydroxide solution to the carboxymethyl chitin is 60ml:10g, mixing and stirring for 3 hours, adding 150g of ice cubes, stirring the mixture to obtain a clarified liquid, cooling in an ice bath, dropwise adding a chloroform solution in which 175g of p-toluenesulfonyl chloride is dissolved for ice bath reaction for 3 hours (175 g of p-toluenesulfonyl chloride is dissolved in 400ml of chloroform solution and then dropwise added), reacting at room temperature for 3 hours, finally pouring the reaction solution into water, collecting a precipitate, washing the precipitate with water to be neutral, washing the precipitate with ethanol, and drying to obtain the sulfonylated carboxymethyl chitin.
S1-2, mixing 24g of the sulfonylated carboxymethyl chitin prepared in S1-1 with 80g of ES fiber raw material, and dissolving in 150g of organic solvent NMP. 8g of pore-forming agent is added, stirred, and then the sulfonylation carboxymethyl chitin fiber layer is prepared by adopting a wet spinning method. After textile molding, volatilizing for 1.5h at constant temperature of 52 ℃ to prepare an upper hydrophilic layer composed of sulfonylation carboxymethyl chitin fiber.
S2, preparing a diversion layer: the upper hydrophilic layer formed by the sulfonylation carboxymethyl chitin fiber and the anti-reverse osmosis layer formed by the viscose fiber are pressed into a diversion layer by a hot air penetrating and bonding method according to the weight g of 1:1.2.
Example 4
A method for preparing a sanitary napkin with high absorption rate was carried out in the same manner as in example 1, except that the ES fiber raw material in S1-2 was replaced with the polypropylene fiber raw material in equal amount.
Comparative example
Comparative example 1
A preparation method of a sanitary towel with high absorption speed is carried out according to the method in the embodiment 1, except that in the step S3, an upper hydrophilic layer of a diversion layer is attached to a water absorption core, an anti-reverse osmosis layer is attached to a surface layer, and hot pressing is combined to form the sanitary towel.
Comparative example 2
A method for preparing a sanitary towel with high absorption speed is carried out according to the method in the embodiment 1, except that the sulfonylated carboxymethyl chitin fiber in the upper hydrophilic layer is replaced by carboxymethyl chitin fiber in an equivalent manner, that is, the sulfonylated carboxymethyl chitin in the step S1-2 is replaced by carboxymethyl chitin obtained in the preparation embodiment 1 in an equivalent manner.
Comparative example 3
A preparation method of a sanitary towel with high absorption speed is carried out according to the method in the embodiment 1, except that the sulfonylated carboxymethyl chitin fiber in the upper hydrophilic layer is replaced by sulfonylated chitin fiber in equal amount, that is, the raw material carboxymethyl chitin in the step S1-1 is replaced by chitin in equal amount, and then the sulfonylated chitin ggg is obtained according to the method in the step S1-1.
Comparative example 4
A preparation method of a sanitary towel with high absorption speed is carried out according to the method in the embodiment 1, except that the sulfonylated carboxymethyl chitin fiber in the upper hydrophilic layer is replaced by the sulfonylated chitin fiber and the carboxymethyl chitin fiber with the weight g of 1:1. That is, the sulfonylated carboxymethyl chitin in the step S1-2g is replaced by sulfonylated chitin and carboxymethyl chitin with the mass ratio of 1:1, the carboxymethyl chitin is carboxymethyl chitin prepared in the preparation example 1, the sulfonylated chitin is obtained by replacing the carboxymethyl chitin raw material in the step S1-1 with chitin in an equivalent manner according to the method in the step S1-1.
Comparative example 5
A method for preparing a sanitary napkin with high absorption rate is carried out by the method in example 1, except that the ES fibers of the upper hydrophilic layer in step S1-2 are replaced with cotton fibers in equal amounts.
Comparative example 6
A method for preparing a sanitary napkin with high absorption rate is carried out by the method in example 1, except that no pore-forming agent is added in step S1-2.
Comparative example 7
A preparation method of a sanitary towel with high absorption speed is carried out according to the method in the embodiment 1, except that the raw material sulfonylated carboxymethyl chitin in the step S1-2 is replaced by chitin in equal quantity, and finally the upper hydrophilic layer is prepared from chitin fiber.
Comparative example 8
A preparation method of a sanitary towel with high absorption speed is carried out according to the method in the embodiment 1, except that the preparation process of the diversion layer in the step S2 is changed, and an upper hydrophilic layer formed by ES fibers and an anti-reverse osmosis layer formed by viscose fibers are pressed into the diversion layer by a hot air penetration bonding method according to the weight g of 1:0.8.
Performance test
1. Liquid penetration time test
Test standard FZT 60017-93 method for testing liquid penetrability of sanitary thin nonwoven fabrics.
2. Liquid holdup test
Detection method/test method
1. Liquid penetration time test: the method is characterized in that a certain amount of artificial urine flows onto a diversion layer sample paved on a standard absorbent core liner according to a specified method, and the time required for the whole liquid to penetrate through the diversion layer sample is measured by an electrical measurement method according to a liquid penetrability test method of the FZT 60017-93 sanitary thin type non-woven fabric. The measured average penetration time is calculated.
2. Liquid holdup measurement:
liquid holdup refers to the amount of liquid retained per unit mass of material, commonly expressed as a percentage, that is applied to a fully wetted material under pressure conditions for a period of time. The diversion layer is required to be in quick contact with a large amount of liquid, the absorbed liquid is released under the condition of constant pressure, and the liquid is conveyed into the water absorption core, so that conditions are created for continuous diversion, and the smaller the liquid holding rate is, the better the continuous diversion capability of the diversion layer is.
The liquid holdup measurement steps are as follows: firstly, measuring the mass dry weight M1 of a sample, fully swelling the sample of the diversion layer with artificial urine for 1h according to a liquid absorption test method, then rapidly placing the sample on the surface of standard absorbent paper, simultaneously pressing a standard pressing block with the length and the width of 100mmx and the mass of 1.20kg on the sample, removing the standard pressing block when the pressure is applied for 1min, and weighing the mass M2 of the sample of the diversion layer by using a balance, wherein the liquid holding rate Lr (%) is shown in the specification. Lr=M2-M1/M1x100%
The liquid penetration time and the liquid holding ratio of the diversion layer in examples and comparative examples were measured according to the above-described methods, respectively, and the measurement results are shown in tables 1 and 2 below:
table 1 example test results
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Liquid penetration time/s | 1.48 | 1.31 | 1.46 | 1.37 |
| Liquid holdup/% | 19.12 | 18.44 | 19.06 | 19.94 |
Table 2 comparative test results
By combining the detection results of examples 1, 2 and 3, the diversion layer prepared according to the application can achieve the effect of rapid diversion and accelerating liquid absorption, wherein the effect of example 2 is better. As can be seen from the combination of examples 1 and 4, the ES fibers and the polypropylene fibers selected in the present application have excellent water-guiding ability as measured in terms of both the liquid penetration time and the liquid holding ratio, and the liquid is rapidly supplied to the absorbent core, thereby accelerating the absorption rate of the sanitary napkin.
As can be seen from the detection results of example 1 and comparative example 6, the fiber layer without pore-forming agent has no enhancement of the bulk of the upper hydrophilic layer, is difficult to form a loose structure of the upper layer and a compact structure of the lower layer, and has insignificant differential capillary effect initiation and significant difference in effect compared with the examples, so that it can be seen that the formation of pores is a key point of the water guiding capability of the upper hydrophilic flow guiding layer.
As can be seen from the detection results of example 1 and comparative example 1, when the viscose fiber is used as the upper layer and the sulfonylated carboxymethyl chitin fiber is used as the lower layer, the liquid penetration speed is obviously reduced, the water absorption rate is reduced, the liquid holding rate is greatly increased, the arrangement structure of the upper layer and the lower layer is the main factor influencing the liquid holding rate, and the effect proves that the upper layer hydrophilic layer is the sulfonylated carboxymethyl chitin fiber with a loose structure and the lower layer is the viscose fiber.
In combination with the results of examples 1 and 2, 3 and 4, it can be seen that the penetration time of the carboxymethyl chitin fiber or the sulfonylated chitin fiber is increased, the liquid holding rate is reduced, and the carboxymethyl chitin fiber has better hydrophilicity, but has no anticoagulation effect, and the fluidity of blood cannot be changed to accelerate drainage, so that the penetration time of liquid is increased, and the liquid holding rate is increased. However, the sulfonylated chitin fiber also needs strong hydrophilicity of carboxymethyl groups to achieve better hydrophilicity. It can be seen that the flow guiding effect is better when the sulfonylated carboxymethyl chitin is added in example 1 than when only carboxymethyl chitin or sulfonylated chitin is added, or when both sulfonylated chitin and carboxymethyl chitin are added, the structure that sulfonyl is based on carboxymethyl is grafted on the chitin chain segment after sulfonylating carboxymethyl chitin in the application.
The test results of example 1 and comparative example 7 show that the use of chitin fiber as the upper hydrophilic layer fiber greatly increases the penetration time, greatly reduces the liquid holding capacity, has general hydrophilicity and general flow conductivity, and cannot solve the technical problem of slow absorption rate of sanitary napkins.
As can be seen from the results of the test in example 1 and comparative example 8, the use of the ES fibers as the upper hydrophilic layer greatly increases the penetration time, increases the liquid holding capacity, and the upper hydrophilic layer has insufficient performance, so that the baffle layer does not function well to accelerate the absorption rate of the sanitary napkin.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (8)
1. The sanitary towel with the high absorption speed comprises a surface layer, a diversion layer, a water absorption core and a waterproof bottom film which are sequentially arranged, and is characterized in that the diversion layer comprises an upper hydrophilic layer and an anti-reverse osmosis layer, the upper hydrophilic layer is attached to the surface layer, the anti-reverse osmosis layer is attached to the water absorption core, the upper hydrophilic layer is made of sulfonylation carboxymethyl chitin fibers, and the anti-reverse osmosis layer is made of viscose fibers; the sulfonylation carboxymethyl chitin fiber is prepared from artificial fiber, sulfonylation carboxymethyl chitin and pore-forming agent.
2. The sanitary towel with high absorption speed according to claim 1, wherein the sulfonylated carboxymethyl chitin fiber is prepared from the following raw materials in parts by weight:
18-24 parts of sulfonylation carboxymethyl chitin, 70-80 parts of artificial fiber and 6-10 parts of pore-forming agent.
3. A quick absorbent sanitary napkin as defined in claim 2, wherein: the preparation method of the sulfonylation carboxymethyl chitin comprises the following steps: weighing 40-50 parts by weight of carboxymethyl chitin, dissolving in a sodium hydroxide solution, mixing and stirring for 2-3 hours, adding 100-150 parts by weight of ice cubes, stirring the mixture to obtain a clarified liquid, cooling in an ice bath, dropwise adding a chloroform solution in which 125-175 parts of p-toluenesulfonyl chloride is dissolved for ice bath reaction for 2-3 hours, then reacting at room temperature for 2-3 hours, finally pouring the reaction solution into water, collecting a precipitate, washing with water to be neutral, washing with ethanol, and drying to obtain the sulfonylated carboxymethyl chitin.
4. A quick absorbent sanitary napkin as defined in claim 3, wherein: the preparation method of the carboxymethyl chitin comprises the following steps of: mixing 10-15 parts of chitin, 100-150 parts of sodium hydroxide aqueous solution and 0.04-0.05 part of sodium dodecyl sulfate uniformly, stirring in a water bath at 20-25 ℃ for 20-25 hours under the protection of nitrogen and in a dark condition, filtering, removing redundant sodium hydroxide solution, adding 125-150 parts of isopropanol into residues, stirring uniformly, dissolving 75-80 parts of chloroacetic acid into 93-100 parts of isopropanol to obtain chloroacetic acid isopropanol solution, dropwise adding chloroacetic acid isopropanol solution at 8-12 ℃ for reaction for 6-8 hours, and heating to 12-16 ℃ for reaction for 20-24 hours after the completion of dropwise adding.
5. A quick absorbent sanitary napkin as defined in claim 1, wherein: the artificial fiber is one of ES fiber and polypropylene fiber.
6. A quick absorbent sanitary napkin as defined in claim 1, wherein: the pore-forming agent is ammonium bicarbonate.
7. A quick absorbent sanitary napkin as defined in claim 1, wherein: the surface layer adopts a fiber net formed by bamboo fiber through a direct laying method.
8. A method of preparing a sanitary napkin having a rapid absorption rate according to any one of claims 1 to 7, comprising the steps of:
s1, preparing an upper hydrophilic layer: mixing a man-made fiber raw material and a sulfonylation carboxymethyl chitin fiber part, dissolving the mixture in an organic solvent NMP, adding a pore-forming agent, and preparing a sulfonylation carboxymethyl chitin fiber layer by adopting a wet spinning method; after textile forming, volatilizing for 1-2h at the constant temperature of 50-55 ℃ to prepare an upper hydrophilic layer formed by sulfonylation carboxymethyl chitin fiber;
s2, preparing a diversion layer: the upper hydrophilic layer formed by the sulfonylation carboxymethyl chitin fiber and the anti-reverse osmosis layer formed by the viscose fiber are respectively 1 (0.8-1.2) by weight parts and pressed into a diversion layer by a hot air penetrating and bonding method; s3, preparing a sanitary towel: the surface layer, the diversion layer, the water absorption core and the seepage-proof bottom film are combined into the sanitary towel by hot pressing from bottom to top.
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| CN202211443779.5A CN116763969A (en) | 2022-11-18 | 2022-11-18 | Sanitary towel with high absorption speed and preparation method thereof |
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| CN202211443779.5A CN116763969A (en) | 2022-11-18 | 2022-11-18 | Sanitary towel with high absorption speed and preparation method thereof |
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