High-absorption side-leakage-preventing 3D liquid sanitary towel and preparation method thereof

Abstract

The invention belongs to the technical field of daily necessities, and particularly relates to a high-absorption side-leakage-preventing 3D liquid sanitary towel and a preparation method thereof. A high-absorption side-leakage-prevention 3D liquid sanitary towel sequentially comprises a surface layer, an absorption layer and a leakage-prevention layer from top to bottom. The preparation method of the absorption layer comprises the following steps: (1) introducing a first oil phase, a water phase A and a water phase B into a first continuous emulsification device to obtain a first emulsion; (2) introducing the second oil phase, the water phase C and the water phase D into a second continuous emulsification device to obtain a second emulsion; and (3) coating the upper surface of a non-woven fabric with the first emulsion, coating the lower surface of the non-woven fabric with the second emulsion, performing illumination and steam treatment, and then performing dehydration and drying to obtain the absorption layer. The absorption layer of the liquid sanitary towel is high in flow conductivity and liquid absorption capacity, and the absorption capacity and the side leakage prevention capacity of the liquid sanitary towel are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of daily necessities, and particularly relates to a 3D liquid sanitary napkin with high absorption and anti-side leakage and a preparation method thereof. Background Art

[0002] A liquid sanitary napkin is not in the true sense of the "liquid" form, but refers to an absorbent material that can quickly convert to a liquid state to achieve an instant dry effect. It uses new materials and innovates the absorbent core structure to enable the liquid to be quickly absorbed and locked, thereby providing a drier and more comfortable experience.

[0003] There are a variety of sanitary napkins on the market, but there are few sanitary napkins for visually impaired women. For people with visual impairments, high-absorbency products can simplify the menstrual management process and make the whole experience more simple and direct.

[0004] The core of a liquid sanitary napkin is the absorbent layer, whose performance directly determines the absorption speed, water locking ability, anti-leakage effect and use comfort of the product. Compared with traditional sanitary napkins, the absorbent layer of existing liquid sanitary napkins has achieved a qualitative improvement through the innovation of polymer materials and the optimization of structural design. However, the absorbent layer in the existing technology still cannot meet the needs of groups with higher requirements for the liquid absorption capacity of sanitary napkins.

[0005] The Chinese invention patent with the publication number CN 116421766 B discloses a preparation method of an absorbent core of a liquid sanitary napkin. By compounding a specific surfactant with a long-chain acrylate monomer and a crosslinking agent, according to the HIPE synthesis process and method, an absorbent core with stronger adsorption performance is prepared, enabling the product to have a higher porosity and a dense microporous structure, realizing the 3D three-dimensional fluid storage function, capable of keeping the surface of the sanitary napkin dry and extending the use time of the sanitary napkin, and solving the problems of blood backflow and side leakage under pressure of traditional core materials. Summary of the Invention

[0006] Aiming at the above problems, the purpose of the present invention is to provide a 3D liquid sanitary napkin with high absorption and anti-side leakage and a preparation method thereof.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A 3D liquid sanitary napkin with high absorption and anti-side leakage includes a surface layer, an absorbent layer and an anti-leakage layer from top to bottom in sequence; the preparation method of the absorbent layer includes the following steps:

[0009] (1) Mix acrylate monomers, crosslinking agents, photoinitiators, and surfactants to obtain a first oil phase; mix inorganic salts and water to obtain aqueous phase A, and mix peroxide initiators and water to obtain aqueous phase B; introduce the first oil phase, aqueous phase A, and aqueous phase B into a first continuous emulsification device to obtain a first emulsion; (2) Mix acrylate monomers, crosslinking agents, photoinitiators, and surfactants to obtain a second oil phase, mix inorganic salts and water to obtain aqueous phase C, and mix peroxide initiators, carboxymethyl cellulose grafted acrylic acid, and water to obtain aqueous phase D; introduce the second oil phase, aqueous phase C, and aqueous phase D into a second continuous emulsification device to obtain a second emulsion; (3) Coat the first emulsion on the upper surface of the non-woven fabric, coat the second emulsion on the lower surface of the non-woven fabric, and after light irradiation and steam treatment, perform dehydration and drying to obtain an absorption layer.

[0010] Preferably, in steps (1) and (2), the acrylate monomers include isodecyl methacrylate and tetradecyl methacrylate in a weight ratio of (60 - 65):(35 - 40); the weight ratio of acrylate monomers, crosslinking agents, photoinitiators, and surfactants is 80:(1 - 1.5):(2 - 2.5):(4 - 5).

[0011] Preferably, the volume ratio of the first oil phase, aqueous phase A, and aqueous phase B and the volume ratio of the second oil phase, aqueous phase C, and aqueous phase D are both 1:(30 - 35):(5 - 10).

[0012] Preferably, the crosslinking agent includes ethylene glycol diacrylate, butanediol dimethacrylate, and trimethylolpropane triacrylate in a weight ratio of 1:(0.2 - 0.4):(1.5 - 1.7).

[0013] Preferably, the peroxide initiator is selected from one or more of ammonium persulfate, sodium persulfate, and potassium persulfate.

[0014] Preferably, the photoinitiator is selected from one or more of benzophenone, benzoin, thioxanthone, and benzyl ketal.

[0015] Preferably, the preparation method of carboxymethyl cellulose grafted acrylic acid includes the following steps:

[0016] (1) Under a nitrogen atmosphere, mix 10 parts by weight of carboxymethyl cellulose and 200 - 230 parts by weight of water, heat up to 60 - 65 °C, and stir to dissolve to obtain an aqueous carboxymethyl cellulose solution;

[0017] (2) After adjusting 60 parts by weight of methacrylic acid to neutral, it is added to the aqueous carboxymethyl cellulose solution. Then, 0.06 - 0.09 parts by weight of N,N - methylenebisacrylamide is added. After stirring evenly, 1 part by weight of sodium persulfate is added, and the temperature is raised to 45 - 50 °C, followed by heat - retaining reaction for 3 - 4 h. After washing and drying, carboxymethyl cellulose grafted acrylic acid is obtained.

[0018] Preferably, the surfactant includes Tween - 60, Span - 80 and alkyl glycoside with a weight ratio of 1:(1.3 - 1.5):(0.5 - 0.7).

[0019] Preferably, aqueous phase A and aqueous phase C contain 3 wt% calcium chloride; aqueous phase B and aqueous phase D contain 10 - 15 wt% peroxide initiator and 3 - 5 wt% carboxymethyl cellulose grafted acrylic acid.

[0020] The preparation method of the high - absorption and anti - side - leakage 3D liquid sanitary napkin: The surface layer is embossed at high temperature to form 3D texture, and the surface layer, absorbent layer and anti - leakage layer are laminated in sequence from top to bottom and combined into a sanitary napkin by hot pressing.

[0021] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0022] 1. The present invention provides a high - absorption and anti - side - leakage 3D liquid sanitary napkin. The absorbent layer of the liquid sanitary napkin has excellent fluid conductivity and liquid absorbency, and is applicable to not only visually - impaired women but also ordinary consumers with high demand for absorption capacity.

[0023] 2. In order to simplify the process flow, by designing the composition ratio of raw materials, the oil - phase and water - phase components in the first emulsion and the second emulsion are kept as consistent as possible. The difference is that carboxymethyl cellulose grafted acrylic acid is added to the second emulsion. Such an operation can save the cost and time of batching, and the raw material storage tank can be reused.

[0024] 3. In the first emulsion used for the absorbent layer, by setting the ratio and composition of acrylate monomer and cross - linker, and under specific surfactant conditions, a synergistic effect is produced, making the pores in the upper layer of the absorbent layer formed by the first emulsion more uniform and more conducive to fluid conduction.

[0025] 4. The second emulsion uses specific surfactants and carboxymethyl cellulose grafted acrylic acid is added to aqueous phase D. Carboxymethyl cellulose grafted acrylic acid can copolymerize with acrylate monomer to form an interpenetrating network. At the same time, carboxymethyl cellulose grafted acrylic acid, as a polymer surfactant, and the surfactant compounded in the present invention play a synergistic role, reducing the oil - water interfacial tension and promoting droplet refinement. The pore size formed by the absorbent layer is smaller, improving the liquid absorption capacity of the liquid sanitary napkin. Description of the Drawings

[0026] Figure 1 This is a schematic structural diagram of the liquid sanitary napkin of the present invention. In the figure, 1 is the surface layer; 2 is the absorption layer; 201 is the non-woven fabric of the absorption layer, 202 is the upper surface layer formed by the first emulsion; 203 is the lower surface layer formed by the second emulsion; 3 is the leakage prevention layer. Specific embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] All raw materials used in the following embodiments of the present invention are commercially available products:

[0029] Carboxymethyl cellulose, Hunan Yunbang Biotechnology Co., Ltd., product number YB55201.

[0030] Alkyl polyglycoside, alkyl polyglycoside APG0814, Jinan Minghao Chemical Co., Ltd.

[0031] Example 1

[0032] This example provides a 3D liquid sanitary napkin with high absorption and anti-side leakage, which sequentially includes a surface layer, an absorption layer and a leakage prevention layer from top to bottom; the preparation method of the absorption layer includes the following steps:

[0033] (1) Mix acrylate monomers, crosslinking agents, photoinitiators and surfactants to obtain a first oil phase; mix inorganic salts and water to obtain aqueous phase A, and mix peroxide initiators and water to obtain aqueous phase B; introduce the first oil phase, aqueous phase A and aqueous phase B into a first continuous emulsification device to obtain a first emulsion;

[0034] The acrylate monomers include isodecyl methacrylate and myristyl methacrylate with a weight ratio of 62:38. The crosslinking agent includes ethylene glycol diacrylate, butanediol dimethacrylate and trimethylolpropane triacrylate with a weight ratio of 1:0.3:1.6. The peroxide initiator is ammonium persulfate. The surfactant includes Tween-60, Span-80 and alkyl polyglycoside with a weight ratio of 1:1.4:0.6. The photoinitiator is benzophenone.

[0035] The weight ratio of acrylate monomers, crosslinking agents, photoinitiators and surfactants is 80:1.2:2.3:4.4.

[0036] The volume ratio of the first oil phase, aqueous phase A and aqueous phase B is 1:32:7. Aqueous phase A is a 3wt% calcium chloride aqueous solution; aqueous phase B contains 12wt% peroxide initiator.

[0037] Operating steps in the first continuous emulsification device: Flow rate of the first oil phase: 20 L / min; Flow rate of aqueous phase A: 5 L / min; Flow rate of aqueous phase B: 10 L / min. Pre-mixing stage: The first oil phase and aqueous phase A are preliminarily mixed in a Y-type static mixer to form a coarse emulsion. The coarse emulsion enters a three-stage high-shear emulsification pump: First-stage shear: 2000 rpm, breaking the oil phase into large droplets (D50 is 152.6 μm). Second-stage shear: 5000 rpm, refining to D50 of 65.9 μm. Third-stage shear: 7000 rpm, homogenizing to D50 of 46.1 μm. The emulsified liquid after shear enters an in-line mixer, and aqueous phase B is simultaneously injected (through a side-flow injection port) and mixed under low-shear stirring (450 rpm) for 15 s.

[0038] (2) Mix acrylate monomers, crosslinking agents, photoinitiators, and surfactants to obtain a second oil phase, mix inorganic salts and water to obtain aqueous phase C, and mix peroxide initiators, carboxymethyl cellulose grafted acrylic acid, and water to obtain aqueous phase D; Feed the second oil phase, aqueous phase C, and aqueous phase D into a second continuous emulsification device to obtain a second emulsion;

[0039] The acrylate monomers include isodecyl methacrylate and myristyl methacrylate in a weight ratio of 62:38. The crosslinking agents include ethylene glycol diacrylate, butanediol dimethacrylate, and trimethylolpropane triacrylate in a weight ratio of 1:0.3:1.6. The peroxide initiator is ammonium persulfate. The surfactants include Tween-60, Span-80, and alkyl glycoside in a weight ratio of 1:1.4:0.6. The photoinitiator is benzophenone.

[0040] The weight ratio of acrylate monomers, crosslinking agents, photoinitiators, and surfactants is 80:1.2:2.3:4.4.

[0041] The volume ratio of the second oil phase, aqueous phase C, and aqueous phase D is all 1:32:7. Aqueous phase C is a 3 wt% calcium chloride aqueous solution. Aqueous phase D contains 13 wt% peroxide initiator and 4 wt% carboxymethyl cellulose grafted acrylic acid.

[0042] Operating steps in the second continuous emulsification device: Flow rate of the second oil phase: 20 L / min; Flow rate of aqueous phase C: 5 L / min; Flow rate of aqueous phase D: 10 L / min. Pre-mixing stage: The second oil phase and aqueous phase C are initially mixed in a Y-type static mixer to form a coarse emulsion. The coarse emulsion enters a three-stage high-shear emulsification pump: First-stage shear: 3000 rpm, breaking the oil phase into large droplets (D50 is 101.3 μm). Second-stage shear: 6000 rpm, refining to D50 of 32.5 μm. Third-stage shear: 8000 rpm, homogenizing to D50 of 15.4 μm. After shear, the emulsion enters an in-line mixer, and aqueous phase D is simultaneously injected (through a side-stream injection port) and mixed under low-shear stirring (500 rpm) for 15 s.

[0043] (3)Coat the upper surface of the non-woven fabric with the first emulsion to a thickness of 0.5 mm, and coat the lower surface of the non-woven fabric with the second emulsion to a thickness of 1.5 mm. Irradiate with light having a wavelength of 450 nm and an intensity of 55 mW / cm 2 for 100 s, place it in a steam tunnel furnace for curing for 5 min, and after drying and slitting, the absorption layer.

[0044] The preparation method of carboxymethyl cellulose grafted with acrylic acid comprises the following steps:

[0045] (1)Under a nitrogen atmosphere, mix 10 parts by weight of carboxymethyl cellulose and 220 parts by weight of water, heat up to 62 °C, and stir to dissolve to obtain an aqueous carboxymethyl cellulose solution;

[0046] (2)Adjust the pH value of 60 parts by weight of methacrylic acid to neutral with a 2 wt% sodium hydroxide solution, add it to the aqueous carboxymethyl cellulose solution, continue to add 0.07 parts by weight of N,N-methylenebisacrylamide, stir evenly, add 1 part by weight of sodium persulfate, heat up to 46 °C, keep warm and react for 3.5 h, wash twice with ethanol and water in sequence, and dry to obtain carboxymethyl cellulose grafted with acrylic acid.

[0047] The preparation method of the highly absorbent and anti-side-leakage 3D liquid sanitary napkin: The surface non-woven fabric is formed with 3D texture by high-temperature embossing, and the surface layer, diversion layer, absorption layer and anti-leakage layer are sequentially laminated from top to bottom and combined into a sanitary napkin by hot pressing.

[0048] The material of the surface layer is non-woven fabric, and the material of the anti-leakage layer is PET film, which are combined by hot pressing. In addition, the preparation method of the liquid sanitary napkin in this embodiment further includes the processes of preparing winglets, brushing back glue on the back of the anti-leakage layer and adhering release paper.

[0049] Example 2

[0050] This embodiment provides a 3D liquid sanitary napkin with high absorption and anti-side leakage, which sequentially includes a surface layer, an absorption layer, and a leakage prevention layer from top to bottom; the preparation method of the absorption layer includes the following steps:

[0051] (1) Mix acrylate monomers, crosslinking agents, photoinitiators, and surfactants to obtain a first oil phase; mix inorganic salts and water to obtain aqueous phase A, and mix peroxide initiators and water to obtain aqueous phase B; introduce the first oil phase, aqueous phase A, and aqueous phase B into a first continuous emulsification device to obtain a first emulsion;

[0052] The acrylate monomers include isodecyl methacrylate and tetradecyl methacrylate with a weight ratio of 60:40. The crosslinking agent includes ethylene glycol diacrylate, butanediol dimethacrylate, and trimethylolpropane triacrylate with a weight ratio of 1:0.2:1.7. The peroxide initiator is ammonium persulfate. The surfactants include Tween-60, Span-80, and alkyl glycoside with a weight ratio of 1:1.5:0.5. The photoinitiator is benzophenone.

[0053] The weight ratio of acrylate monomers, crosslinking agents, photoinitiators, and surfactants is 80:1:2:4.

[0054] The volume ratio of the first oil phase, aqueous phase A, and aqueous phase B is 1:30:10. Aqueous phase A is a 3wt% calcium chloride aqueous solution; aqueous phase B contains 15wt% peroxide initiator.

[0055] Operating steps in the first continuous emulsification device: First oil phase flow rate: 20 L / min; Aqueous phase A flow rate: 5 L / min; Aqueous phase B flow rate: 10 L / min. Pre-mixing stage: The first oil phase and aqueous phase A are preliminarily mixed in a Y-type static mixer to form a coarse emulsion. The coarse emulsion enters a three-stage high-shear emulsification pump: First-stage shear: 2000 rpm, breaking the oil phase into large droplets (D50 is 155.1μm). Second-stage shear: 5000 rpm, refining to D50 of 64.7μm. Third-stage shear: 7000 rpm, homogenizing to D50 of 45.5μm. The sheared emulsion enters an in-line mixer, and aqueous phase B is simultaneously injected (through a side-stream injection port) and mixed under low-shear stirring (450 rpm) for 15 s.

[0056] (2) Mix acrylate monomers, crosslinking agents, photoinitiators, and surfactants to obtain a second oil phase, mix inorganic salts and water to obtain aqueous phase C, and mix peroxide initiators, carboxymethyl cellulose grafted acrylic acid, and water to obtain aqueous phase D; introduce the second oil phase, aqueous phase C, and aqueous phase D into a second continuous emulsification device to obtain a second emulsion;

[0057] The acrylate monomer includes isodecyl methacrylate and myristyl methacrylate in a weight ratio of 60:40. The crosslinking agent includes ethylene glycol diacrylate, butanediol dimethacrylate and trimethylolpropane triacrylate in a weight ratio of 1:0.2:1.7. The peroxide initiator is ammonium persulfate. The surfactant includes Tween-60, Span-80 and alkyl glycoside in a weight ratio of 1:1.5:0.5. The photoinitiator is benzophenone.

[0058] The weight ratio of the acrylate monomer, crosslinking agent, photoinitiator and surfactant is 80:1:2:4.

[0059] The volume ratio of the second oil phase, aqueous phase C and aqueous phase D is 1:30:10. Aqueous phase C is an aqueous calcium chloride solution with a concentration of 3 wt%. Aqueous phase D contains 10 wt% peroxide initiator and 5 wt% carboxymethyl cellulose grafted acrylic acid.

[0060] Operating steps in the second continuous emulsification device: Flow rate of the second oil phase: 20 L / min; Flow rate of aqueous phase C: 5 L / min; Flow rate of aqueous phase D: 10 L / min. Pre-mixing stage: The second oil phase and aqueous phase C are preliminarily mixed in a Y-type static mixer to form a coarse emulsion. The coarse emulsion enters a three-stage high-shear emulsification pump: First-stage shear: 3000 rpm, breaking the oil phase into large droplets (D50 is 100.5 μm). Second-stage shear: 6000 rpm, refining to D50 of 30.8 μm. Third-stage shear: 8000 rpm, homogenizing to D50 of 15.1 μm. The emulsified liquid after shear enters an in-line mixer, and aqueous phase D is synchronously injected (through a side-stream injection port) and mixed under low-shear stirring (500 rpm) for 15 s.

[0061] (3) Coat the first emulsion on the upper surface of the non-woven fabric with a thickness of 0.5 mm, and coat the second emulsion on the lower surface of the non-woven fabric with a thickness of 1.5 mm. Irradiate with light of a wavelength of 450 nm and an intensity of 55 mW / cm 2 for 100 s, place it in a steam tunnel furnace for curing for 5 min, and after drying and slitting, an absorption layer is obtained.

[0062] The preparation method of carboxymethyl cellulose grafted acrylic acid includes the following steps:

[0063] (1) Under a nitrogen atmosphere, mix 10 parts by weight of carboxymethyl cellulose and 230 parts by weight of water, heat up to 60 °C, and stir to dissolve to obtain an aqueous carboxymethyl cellulose solution;

[0064] (2) Adjust the pH value of 60 parts by weight of methacrylic acid to neutral with a 2 wt% sodium hydroxide solution, add it to the aqueous carboxymethyl cellulose solution, continue to add 0.07 parts by weight of N,N-methylenebisacrylamide, stir evenly, add 1 part by weight of sodium persulfate, heat up to 50 °C, keep the temperature for reaction for 3 h, wash twice with ethanol and water in sequence, and dry to obtain carboxymethyl cellulose grafted with acrylic acid.

[0065] The preparation method of the high-absorbency and anti-side-leakage 3D liquid sanitary napkin: The surface non-woven fabric is embossed at high temperature to form 3D texture, and the surface layer, the diversion layer, the absorption layer and the anti-leakage layer are laminated in sequence from top to bottom and combined into a sanitary napkin by hot pressing.

[0066] The material of the surface layer is non-woven fabric, and the material of the anti-leakage layer is PET film, which are combined by hot pressing. In addition, the preparation method of the liquid sanitary napkin in this embodiment further includes the processes of preparing winglets, brushing back glue on the back of the anti-leakage layer and adhering release paper.

[0067] Comparative Example 1

[0068] The difference between this comparative example and Example 1 is that: the acrylate monomer is isodecyl methacrylate.

[0069] Comparative Example 2

[0070] The difference between this comparative example and Example 1 is that: the acrylate monomer includes isodecyl methacrylate and tetradecyl methacrylate with a weight ratio of 50:50.

[0071] Comparative Example 3

[0072] The difference between this comparative example and Example 1 is that: the acrylate monomer includes 2-ethylhexyl acrylate and isooctyl methacrylate with a weight ratio of 62:38.

[0073] Comparative Example 4

[0074] The difference between this comparative example and Example 1 is that: the crosslinking agent is trimethylolpropane triacrylate.

[0075] Comparative Example 5

[0076] The difference between this comparative example and Example 1 is that: the crosslinking agent includes ethylene glycol diacrylate and trimethylolpropane triacrylate with a weight ratio of 1:1.6.

[0077] Comparative Example 6

[0078] The difference between this comparative example and Example 1 is that: the crosslinking agent includes ethylene glycol diacrylate, butanediol dimethacrylate and trimethylolpropane triacrylate with a weight ratio of 0.3:1.6:1.

[0079] Comparative Example 7

[0080] The difference between this comparative example and Example 1 is that the surfactant includes Tween-60, Span-80 and alkyl polyglycoside with a weight ratio of 1.4:0.6:1.

[0081] Comparative Example 8

[0082] The difference between this comparative example and Example 1 is that the surfactant is Span-80.

[0083] Comparative Example 9

[0084] The difference between this comparative example and Example 1 is that the surfactant includes Tween-60 and Span-80 with a weight ratio of 1:0.6.

[0085] Comparative Example 10

[0086] The difference between this comparative example and Example 1 is that the surfactant is the surfactant in Example 1 of the preparation method of a liquid sanitary napkin absorbent core disclosed in the Chinese patent with the publication number CN 116421766 B.

[0087] Performance Test

[0088] (1) Coat the first emulsion on the upper surface of the non-woven fabric with a thickness of 0.5 mm, irradiate it with light with a wavelength of 450 nm and an intensity of 55 mW / cm 2 for 100 s, put it into a steam tunnel furnace for curing for 5 min, and after drying and slitting, obtain the diversion layer of the absorbent layer. Perform performance tests on it.

[0089] Liquid penetration time: Refer to the test method for liquid penetration of thin non-woven fabrics for sanitary use FZ / T 60017-1993 to measure the liquid penetration time.

[0090] Liquid holding rate: Put the diversion layer (mass m1) into artificial menstrual blood to fully swell for 1 h, then quickly place the sample on the surface of standard absorbent paper, and at the same time press a standard press block with a length and width of 100 mm×100 mm and a mass of 1.20 kg on the sample. Remove the standard press block after 1 min of pressing, measure the mass m2, and measure the liquid holding rate = (m2 - m1) / m1×100%. The lower the liquid holding rate, the better the continuous diversion ability of the diversion layer.

[0091] (2) Refer to GB / T14207-2024 to measure the water absorption multiple of the absorbent layers prepared in Examples 1-2 and Comparative Examples 1-10. The formula for the water absorption multiple = (mass after water absorption - mass before water absorption) / mass before water absorption.

[0092] The results are shown in Table 1.

[0093] Table 1 Performance Test Results

[0094] As can be seen from Table 1, the absorption layer prepared in Examples 1-2 has high flow guiding ability and strong liquid absorption ability.

[0095] In Comparative Examples 1-3, the type and ratio of acrylate monomer 1 are changed. Different acrylate monomers have different hydrophilic and hydrophobic balances, and the emulsification effect of the surfactant is poor under this condition, resulting in a decrease in the flow guiding ability of the absorption layer.

[0096] In Comparative Examples 4-6, the type and ratio of the crosslinking agent are changed. The reaction activity of the crosslinking agent will affect the growth mode of the polymer chain and the crosslinking mode, thereby affecting the size and shape of the pores, and the flow guiding ability of the absorption layer decreases.

[0097] In Comparative Examples 7-10, the type and ratio of the surfactant are changed, and the liquid absorption ability of the absorption layer decreases.

[0098] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A 3D liquid sanitary napkin with high absorbency and anti-side leakage, characterized in that, It successively includes a surface layer, an absorption layer, and a leakage-proof layer from top to bottom; the preparation method of the absorption layer includes the following steps: (1) Mix acrylate monomers, a crosslinking agent, a photoinitiator, and a surfactant to obtain a first oil phase; mix inorganic salts and water to obtain aqueous phase A, and mix a peroxide initiator and water to obtain aqueous phase B; feed the first oil phase, aqueous phase A, and aqueous phase B into a first continuous emulsifying device to obtain a first emulsion; (2) Mix acrylate monomers, a crosslinking agent, a photoinitiator, and a surfactant to obtain a second oil phase, mix inorganic salts and water to obtain aqueous phase C, and mix a peroxide initiator, carboxymethyl cellulose grafted acrylic acid, and water to obtain aqueous phase D; feed the second oil phase, aqueous phase C, and aqueous phase D into a second continuous emulsifying device to obtain a second emulsion; (3) Coat the first emulsion on the upper surface of the non-woven fabric, coat the second emulsion on the lower surface of the non-woven fabric, after light irradiation and steam treatment, carry out dehydration and drying to obtain the absorption layer.

2. The 3D liquid sanitary napkin with high absorption and anti-side leakage according to claim 1, characterized in that, In the steps (1) and (2), the acrylate monomers include isodecyl methacrylate and myristyl methacrylate with a weight ratio of (60 - 65):(35 - 40); the weight ratio of the acrylate monomers, the crosslinking agent, the photoinitiator, and the surfactant is 80:(1 - 1.5):(2 - 2.5):(4 - 5).

3. The 3D liquid sanitary napkin with high absorbency and side leakage prevention according to claim 1, wherein The volume ratio of the first oil phase, aqueous phase A, and aqueous phase B, and the volume ratio of the second oil phase, aqueous phase C, and aqueous phase D are the same, both being 1:(30 - 35):(5 - 10).

4. The 3D liquid sanitary napkin with high absorbency and anti-side leakage according to claim 1, characterized in that, The crosslinking agent includes ethylene glycol diacrylate, butanediol dimethacrylate, and trimethylolpropane triacrylate with a weight ratio of 1:(0.2 - 0.4):(1.5 - 1.7).

5. The 3D liquid sanitary napkin with high absorbency and side leakage prevention according to claim 1, characterized in that, The peroxide initiator is selected from one or more of ammonium persulfate, sodium persulfate, and potassium persulfate.

6. The 3D liquid sanitary napkin with high absorbency and anti-side leakage according to claim 1, characterized in that, The photoinitiator is selected from one or more of benzophenone, benzil, thioxanthone, and benzyl ketal.

7. The high-absorbency and side leakage-proof 3D liquid sanitary napkin according to claim 1, characterized in that, The preparation method of carboxymethyl cellulose grafted acrylic acid includes the following steps: (1) Under a nitrogen atmosphere, mix 10 parts by weight of carboxymethyl cellulose and 200 - 230 parts by weight of water, stir and dissolve to obtain a carboxymethyl cellulose aqueous solution; (2) Adjust 60 parts by weight of methacrylic acid to neutral, add it to the carboxymethyl cellulose aqueous solution, continue to add 0.06 - 0.09 parts by weight of N,N - methylenebisacrylamide, stir evenly, add ammonium persulfate, heat up to 45 - 50 °C, keep warm and react for 3 - 4 h, wash and dry to obtain carboxymethyl cellulose grafted acrylic acid.

8. The 3D liquid sanitary napkin with high absorbency and anti-side leakage according to claim 1, characterized in that, The surfactant includes Tween - 60, Span - 80, and alkyl glycoside with a weight ratio of 1:(1.3 - 1.5):(0.5 - 0.7).

9. The 3D liquid sanitary napkin with high absorption and anti-side leakage according to claim 1, wherein, Both aqueous phase B and aqueous phase D contain 10 - 15 wt% of peroxide initiator and 3 - 5 wt% of carboxymethyl cellulose grafted acrylic acid.

10. A method for preparing a 3D liquid sanitary napkin with high absorption and anti-side leakage according to any one of claims 1-9, characterized in that, Form 3D textures on the surface layer by high - temperature embossing, stack the surface layer, the absorption layer, and the leakage - proof layer in sequence from top to bottom, and combine them into a sanitary napkin by hot pressing.

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