A dual-core paper diaper water-absorbing material and a method for manufacturing the same

Abstract

The present application relates to a kind of double-core paper diaper water-absorbing material and its preparation method, belong to baby paper diaper field, the double-core paper diaper water-absorbing material includes acrylic acid 55-67 parts, salt-resistant anti-bonding auxiliary agent 10-14 parts, ammonium persulfate 1.4-1.7 parts, sodium sulfite 0.7-1.0 parts, glycerol 1-2.5 parts, aluminium sulfate 0.5-0.9 parts and ethanol 16-26 parts according to weight parts.The water-absorbing material is composed of water-absorbing core and coating layer.Amide group in water-absorbing core water-absorbing capacity is less affected by salt solution, after water absorption, water-absorbing core internal macromolecular network ionizes into ion pair, due to the difference between internal and external ion concentration produces greater osmotic pressure, can effectively improve the salt resistance and water-absorbing speed of water-absorbing material;The formation of coating layer further improves the salt resistance of water-absorbing material, and the gel strength of this coating layer is larger after water absorption, to avoid bonding agglomeration.

Description

Technical Field

[0001] This invention belongs to the field of infant diapers, specifically, it relates to an absorbent material for dual-core diapers and its preparation method. Background Technology

[0002] Baby diapers mainly consist of three parts: the surface covering layer, the absorbent core, and the bottom fabric. The absorbent core is mainly composed of super absorbent polymer (SAP), and its main function is to quickly absorb urine. Traditional first, second, and third generation cores are all single-core structures. Clumping, tearing, and slow absorption rates are common problems of single-core structures. Although the third generation core has improved the process by using adhesive bonding, the diaper still expands after absorbing water, resulting in poor breathability. Excessive stuffiness reduces comfort and affects the wearing experience.

[0003] Due to the problems inherent in single-core structures, dual-core structures were developed. Dual-core structures are composed of a core structure and wood pulp sheets layered together. This layered structure prevents dual-core diapers from having a loose structure like polymer and wood pulp composites, thus improving the diaper's absorbency and allowing urine to spread faster and more evenly. It also solves the problem of clumping and tearing.

[0004] Normal infant urine is pale yellow and transparent. When the ambient temperature decreases, salt crystals precipitate in the urine. The water absorption of SAP is greatly affected by the electrolyte in the solution and is sensitive to ions in the solution. Under normal circumstances, the water absorption rate of SAP in inorganic salt solutions is only 5%-15% of that in pure water. At the same time, SAP is prone to deliquescence on the resin surface after contact with water, causing the particles to stick and agglomerate, which prevents water from entering and leads to a significant decrease in the amount and rate of water absorption of SAP. Summary of the Invention

[0005] In order to solve the technical problems mentioned in the background art, the purpose of this invention is to provide a absorbent material for dual-core diapers and its preparation method.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A type of absorbent material for dual-core diapers comprises the following raw materials in parts by weight:

[0008] Acrylic acid 55-67 parts, salt-resistant anti-blocking agent 10-14 parts, ammonium persulfate 1.4-1.7 parts, sodium sulfite 0.7-1.0 parts, glycerol 1-2.5 parts, aluminum sulfate 0.5-0.9 parts, and ethanol 16-26 parts.

[0009] Salt-resistant anti-blocking agent is prepared by the following method:

[0010] Step A1: Mix salicylic acid, p-phenylenediamine, zinc powder and DMSO, add zeolite, control the stirring rate at 200-250 r / min, heat to 150-170℃, and stir for 1-2 h to obtain compound A;

[0011] Furthermore, the ratio of salicylic acid, p-phenylenediamine, zinc powder, and DMSO is 1 mol: 1 mol: 0.3-0.5 g: 55-60 mL.

[0012] The carboxyl group in salicylic acid and the amino group at the terminal end of p-phenylenediamine undergo an amidation reaction catalyzed by zinc powder to introduce an amide group. The specific reaction process is as follows:

[0013]

[0014] Step A2: Mix compound A, methylcarbamoyl chloride, aluminum trichloride and DMF and add them to the mixture. Control the stirring rate to 500-600 r / min, heat to 80-95℃, and stir for 1-2 hours to obtain compound B.

[0015] Furthermore, the ratio of compound A, methylcarbamoyl chloride, aluminum trichloride, and DMF is 1 mol: 1.1 mol: 2-3 g: 65-70 mL.

[0016] Metharcarbamoyl chloride is grafted onto the other end amino group of the benzene ring under the catalysis of aluminum trichloride. The specific reaction process is as follows:

[0017]

[0018] Step A3: Mix compound B, epichlorohydrin, catalyst TEBAC and toluene and add them to the mixture. Control the stirring rate to 200-300 r / min, heat to 80-83℃ and react for 1-1.5 h. After cooling to room temperature, add sodium hydroxide and continue the reaction for 0.5-1 h to obtain a salt-resistant anti-adhesion additive.

[0019] Furthermore, the ratio of compound B, epichlorohydrin, catalyst TEBAC, toluene, and sodium hydroxide is 1 mol: 3.2 mol: 0.1-0.2 g: 60-65 mL: 3-5 g.

[0020] Compound B reacts with epichlorohydrin under the catalysis of TEBAC, grafting epoxy groups onto compound B to obtain a salt-resistant anti-blocking agent. The specific reaction process is as follows:

[0021]

[0022] A method for preparing an absorbent material for diapers includes the following steps:

[0023] Step S1: Take acrylic acid, 2 / 3 of the amount of salt-resistant anti-blocking agent, ammonium persulfate and sodium sulfite, mix and feed them into the mixture, apply 100-200 r / min, heat to 40-50℃ and polymerize for 3-5 hours to obtain the billet, dry the billet in an oven, control the oven temperature at 100-110℃, dry for 1 hour, then crush and sieve to obtain the water-absorbing core.

[0024] Furthermore, the mesh size of the absorbent core is 40-60 mesh.

[0025] Step S2: Mix glycerol, aluminum sulfate, ethanol, and 1 / 3 of the salt-resistant anti-adhesion agent. Control the stirring speed to 100-200 r / min and mix for 30 min to obtain a surface crosslinking liquid. Set the temperature of the small rotary drum coating machine to 60-70℃ and add the absorbent core into the machine for preheating for 10-20 min. Then, spray the surface crosslinking liquid onto the surface of the absorbent core and cure for 2-3 h to obtain the absorbent material.

[0026] The beneficial effects of this invention are:

[0027] This invention discloses a double-core absorbent material for diapers and its preparation method. The absorbent material is composed of an absorbent core and a covering layer.

[0028] The absorbent core is obtained by polymerizing acrylic acid, salt-resistant anti-blocking agent, ammonium persulfate and sodium sulfite, followed by drying, crushing and sieving. The salt-resistant anti-blocking agent introduces a large number of amide groups, so the water absorption capacity is less affected by the salt solution and the water absorption speed is faster. After absorbing water, the polymer network inside the absorbent core ionizes into ion pairs, and the ion concentration of the aqueous solution increases. Due to the difference in ion concentration inside and outside, a large osmotic pressure is generated, which allows more water to enter the core, which can effectively improve the salt resistance and water absorption speed of the absorbent material.

[0029] The epoxy groups in the salt-resistant anti-adhesion additive react with the carboxyl groups in the absorbent core under the catalytic action of aluminum ions in the surface crosslinking liquid, forming a coating layer on the surface of the absorbent core. This facilitates liquid penetration while blocking the penetration of salt particles, further improving the salt resistance of the absorbent core. At the same time, the gel strength of this coating layer increases after water absorption, preventing it from sticking together due to water absorption. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] The raw materials for the absorbent material used in this embodiment of a dual-core diaper are as follows.

[0032] Ammonium persulfate (Sinopharm Chemical Reagent Co., Ltd.);

[0033] Sodium sulfite (Sinopharm Chemical Reagent Co., Ltd.);

[0034] Aluminum sulfate (Shanghai Aladdin Biochemical Technology Co., Ltd.);

[0035] Ethanol (60% ethanol concentration);

[0036] DMSO (dimethyl sulfoxide, Shanghai Aladdin Biochemical Technology Co., Ltd.);

[0037] DMF (N,N-dimethylformamide, Shanghai Aladdin Biochemical Technology Co., Ltd.);

[0038] TEBAC (Triethylbenzylammonium chloride, Zhongshan Dixin Chemical Co., Ltd.);

[0039] Example 1

[0040] The process for preparing a dual-core absorbent material for diapers in this embodiment is as follows:

[0041] 1) Preparation of salt-resistant anti-adhesion additives

[0042] a1: Mix salicylic acid, p-phenylenediamine, zinc powder and DMSO, add zeolite, control the stirring speed at 230 r / min, heat to 160℃ and reflux for 1.5 h to obtain compound A; In the above reaction, the ratio of salicylic acid, p-phenylenediamine, zinc powder and DMSO is 1 mol: 1 mol: 0.4 g: 55 mL.

[0043] a2: Compound A, methylcarbamoyl chloride, aluminum trichloride and DMF were mixed and fed into the mixture. The stirring rate was controlled at 550 r / min, and the mixture was heated to 87℃ and reacted for 1.5 h to obtain compound B. In the above reaction, the ratio of the amount of compound A, methylcarbamoyl chloride, aluminum trichloride and DMF was 1 mol: 1.1 mol: 2.5 g: 65 mL.

[0044] a3: Compound B, epichlorohydrin, catalyst TEBAC, and toluene were mixed and fed into the mixture. The stirring rate was controlled at 250 r / min. The mixture was heated to 82℃ and reacted for 1.5 h. After cooling to room temperature, sodium hydroxide was added, and the reaction was continued for 1 h to obtain a salt-resistant anti-sticking agent. In the above reaction, the ratio of compound B, epichlorohydrin, catalyst TEBAC, toluene, and sodium hydroxide was 1 mol: 1.5 mol: 0.2 g: 60 mL: 4 g.

[0045] 2) Prepare a absorbent material for dual-core diapers

[0046] s1: Ingredients, take according to weight:

[0047] 57 parts acrylic acid;

[0048] 9 parts of salt-resistant anti-blocking agent;

[0049] 1.4 parts of ammonium persulfate;

[0050] Sodium sulfite 0.8 parts;

[0051] 1.5 parts glycerol;

[0052] 0.7 parts aluminum sulfate;

[0053] 26 parts of ethanol;

[0054] s2: Take acrylic acid, 2 / 3 of the amount of salt-resistant anti-blocking agent, ammonium persulfate and sodium sulfite, mix and feed them, apply 100 r / min, heat to 40℃ and polymerize for 3 hours to obtain the billet, dry the billet in an oven, control the oven temperature to 100℃, dry for 1 hour, crush and sieve to obtain 45 mesh water-absorbing core.

[0055] s3: Mix glycerol, aluminum sulfate, ethanol, and 1 / 3 of the amount of salt-resistant anti-adhesion additive, control the stirring speed at 100 r / min, and mix for 30 min to obtain a surface crosslinking liquid; set the temperature of the small rotary drum coating machine to 60℃, add the water-absorbing core into the small rotary drum coating machine and preheat for 10 min, then spray the surface crosslinking liquid onto the surface of the water-absorbing core, and cure for 2 h to obtain the water-absorbing material.

[0056] Example 2

[0057] The process for preparing a dual-core absorbent material for diapers in this embodiment is as follows:

[0058] 1) Preparation of salt-resistant anti-adhesion additives

[0059] a1: Mix salicylic acid, p-phenylenediamine, zinc powder and DMSO, add zeolite, control the stirring speed at 250 r / min, heat to 170℃ and reflux for 2 h to obtain compound A; In the above reaction, the ratio of salicylic acid, p-phenylenediamine, zinc powder and DMSO is 1 mol: 1 mol: 0.5 g: 60 mL.

[0060] a2: Compound A, methylcarbamoyl chloride, aluminum trichloride and DMF were mixed and fed into the mixture. The stirring rate was controlled at 600 r / min, and the mixture was heated to 95℃ and reacted for 2 h to obtain compound B. In the above reaction, the ratio of the amount of compound A, methylcarbamoyl chloride, aluminum trichloride and DMF was 1 mol: 1.1 mol: 3 g: 70 mL.

[0061] a3: Compound B, epichlorohydrin, catalyst TEBAC, and toluene were mixed and fed into the mixture. The stirring rate was controlled at 200 r / min. The mixture was heated to 80℃ and reacted for 1 h. After cooling to room temperature, sodium hydroxide was added, and the reaction was continued for 0.5 h to obtain a salt-resistant anti-sticking agent. In the above reaction, the ratio of compound B, epichlorohydrin, catalyst TEBAC, and toluene was 1 mol: 3.2 mol: 0.1 g: 65 mL: 3 g.

[0062] 2) Prepare a absorbent material for dual-core diapers

[0063] s1: Ingredients, take according to weight:

[0064] 67 parts acrylic acid;

[0065] 14 parts of salt-resistant anti-blocking agent;

[0066] 1.7 parts of ammonium persulfate;

[0067] Sodium sulfite 1.0 part;

[0068] Glycerol 2.5 parts;

[0069] 0.9 parts aluminum sulfate;

[0070] 26 parts of ethanol;

[0071] s2: Take acrylic acid, 2 / 3 of the amount of salt-resistant anti-blocking agent, ammonium persulfate and sodium sulfite, mix and feed them, apply 200 r / min, heat to 50℃ and polymerize for 5 hours to obtain the billet, dry the billet in an oven, control the oven temperature at 110℃, dry for 1 hour, crush and sieve to obtain 40 mesh water-absorbing core.

[0072] s3: Mix glycerol, aluminum sulfate, ethanol, and 1 / 3 of the amount of salt-resistant anti-adhesion additive, control the stirring speed at 200 r / min, and mix for 30 min to obtain a surface crosslinking liquid; set the temperature of the small rotary drum coating machine to 70℃, add the water-absorbing core into the small rotary drum coating machine and preheat for 20 min, then spray the surface crosslinking liquid onto the surface of the water-absorbing core, and cure for 3 h to obtain the water-absorbing material.

[0073] Example 3

[0074] The process for preparing a dual-core absorbent material for diapers in this embodiment is as follows:

[0075] 1) Preparation of salt-resistant anti-adhesion additives

[0076] a1: Salicylic acid, p-phenylenediamine, zinc powder and DMSO were mixed and fed into the mixture. Zeolite was added, and the stirring speed was controlled at 250 r / min. The mixture was heated to 170℃ and refluxed for 2 h to obtain compound A. In the above reaction, the ratio of salicylic acid, p-phenylenediamine, zinc powder and DMSO was 1 mol: 1 mol: 0.5 g: 57 mL.

[0077] a2: Compound A, methylcarbamoyl chloride, aluminum trichloride and DMF were mixed and fed into the mixture. The stirring rate was controlled at 520 r / min, and the mixture was heated to 88℃ and reacted for 1 h to obtain compound B. In the above reaction, the ratio of the amount of compound A, methylcarbamoyl chloride, aluminum trichloride and DMF was 1 mol: 1.1 mol: 2.1 g: 68 mL.

[0078] a3: Compound B, epichlorohydrin, catalyst TEBAC and toluene were mixed and fed into the mixture. The stirring rate was controlled at 200 r / min. The mixture was heated to 81℃ and reacted for 1 h. After cooling to room temperature, sodium hydroxide was added and the reaction was continued for 0.5 h to obtain a salt-resistant anti-sticking agent. In the above reaction, the ratio of compound B, epichlorohydrin, catalyst TEBAC and toluene was 1 mol: 1.5 mol: 0.1 g: 4 g: 62 mL.

[0079] 2) Prepare a absorbent material for dual-core diapers

[0080] s1: Ingredients, take according to weight:

[0081] 60 parts acrylic acid;

[0082] 12 parts of salt-resistant anti-adhesion additive;

[0083] 1.6 parts of ammonium persulfate;

[0084] Sodium sulfite 1.0 part;

[0085] Glycerol 2.5 parts;

[0086] 0.9 parts aluminum sulfate;

[0087] 26 parts of ethanol;

[0088] s2: Take acrylic acid, 2 / 3 of the amount of salt-resistant anti-blocking agent, ammonium persulfate and sodium sulfite, mix and feed them, apply 200 r / min, heat to 50℃ and polymerize for 5 hours to obtain the billet, dry the billet in an oven, control the oven temperature at 110℃, dry for 1 hour, crush and sieve to obtain 60 mesh water-absorbing core.

[0089] s3: Mix glycerol, aluminum sulfate, ethanol, and 1 / 3 of the amount of salt-resistant anti-adhesion additive, control the stirring speed at 150 r / min, and mix for 30 min to obtain a surface crosslinking liquid; set the temperature of the small rotary drum coating machine to 65℃, add the water-absorbing core into the small rotary drum coating machine and preheat for 20 min, then spray the surface crosslinking liquid onto the surface of the water-absorbing core, and cure for 2.5 h to obtain the water-absorbing material.

[0090] Example 4

[0091] The process for preparing a dual-core absorbent material for diapers in this embodiment is as follows:

[0092] 1) Preparation of salt-resistant anti-adhesion additives

[0093] a1: Take salicylic acid, p-phenylenediamine, zinc powder and DMSO, add zeolite, control the stirring speed at 250 r / min, heat to 170℃ and reflux for 2 h to obtain compound A; in the above reaction, the ratio of salicylic acid, p-phenylenediamine, zinc powder and DMSO is 1 mol: 1 mol: 0.5 g: 60.

[0094] a2: Compound A, methylcarbamoyl chloride, aluminum trichloride and DMF were mixed and fed into the mixture. The stirring rate was controlled at 520 r / min, and the mixture was heated to 88℃ and reacted for 1 h to obtain compound B. In the above reaction, the ratio of the amount of compound A, methylcarbamoyl chloride, aluminum trichloride and DMF was 1 mol: 1.1 mol: 2.1 g: 68 mL.

[0095] a3: Compound B, epichlorohydrin, catalyst TEBAC, and toluene were mixed and fed into the mixture. The stirring rate was controlled at 200 r / min. The mixture was heated to 82℃ and reacted for 1 h. After cooling to room temperature, sodium hydroxide was added, and the reaction was continued for 0.5 h to obtain a salt-resistant anti-sticking agent. In the above reaction, the ratio of compound B, epichlorohydrin, catalyst TEBAC, and toluene was 1 mol: 1.5 mol: 0.1 g: 64 mL: 4 g.

[0096] 2) Prepare a absorbent material for dual-core diapers

[0097] s1: Ingredients, take according to weight:

[0098] 60 parts acrylic acid;

[0099] 12 parts of salt-resistant anti-adhesion additive;

[0100] 1.5 parts ammonium persulfate;

[0101] Sodium sulfite 1.0 part;

[0102] Glycerol 2.5 parts;

[0103] 0.9 parts aluminum sulfate;

[0104] 26 parts of ethanol;

[0105] s2: Take acrylic acid, 2 / 3 of the amount of salt-resistant anti-blocking agent, ammonium persulfate and sodium sulfite, mix and feed them, apply 200 r / min, heat to 50℃ and polymerize for 5 hours to obtain the billet, dry the billet in an oven, control the oven temperature at 110℃, dry for 1 hour, crush and sieve to obtain 50 mesh water-absorbing core.

[0106] s3: Mix glycerol, aluminum sulfate, ethanol, and 1 / 3 of the amount of salt-resistant anti-adhesion additive, control the stirring speed at 150 r / min, and mix for 30 min to obtain a surface crosslinking liquid; set the temperature of the small rotary drum coating machine to 68℃, add the water-absorbing core into the small rotary drum coating machine and preheat for 20 min, then spray the surface crosslinking liquid onto the surface of the water-absorbing core, and cure for 1.5 h to obtain the water-absorbing material.

[0107] Example 5

[0108] The process for preparing a dual-core absorbent material for diapers in this embodiment is as follows:

[0109] 1) Preparation of salt-resistant anti-adhesion additives

[0110] a1: Mix salicylic acid, p-phenylenediamine, zinc powder and DMSO, add zeolite, control the stirring speed at 200 r / min, heat to 150℃ and reflux for 1 h to obtain compound A; In the above reaction, the ratio of salicylic acid, p-phenylenediamine, zinc powder and DMSO is 1 mol: 1 mol: 0.3 g: 60 mL.

[0111] a2: Compound A, methylcarbamoyl chloride, aluminum trichloride and DMF were mixed and fed into the mixture. The stirring rate was controlled at 500 r / min. The mixture was heated to 80℃ and reacted for 1 h to obtain compound B. In the above reaction, the ratio of the amount of compound A, methylcarbamoyl chloride, aluminum trichloride and DMF was 1 mol: 1.1 mol: 2 g: 70 mL.

[0112] a3: Compound B, epichlorohydrin, catalyst TEBAC and toluene were mixed and fed into the mixture. The stirring rate was controlled at 200 r / min. The mixture was heated to 80℃ and reacted for 1 h. After cooling to room temperature, sodium hydroxide was added and the reaction was continued for 0.5 h to obtain a salt-resistant anti-sticking agent. In the above reaction, the ratio of compound B, epichlorohydrin, catalyst TEBAC and toluene was 1 mol: 1.5 mol: 0.1 g: 65 mL: 3 g.

[0113] 2) Prepare a absorbent material for dual-core diapers

[0114] s1: Ingredients, take according to weight:

[0115] 55 parts acrylic acid;

[0116] 10 parts of salt-resistant anti-blocking agent;

[0117] 1.4 parts of ammonium persulfate;

[0118] Sodium sulfite 0.7 parts;

[0119] 1 part glycerol;

[0120] 0.5 parts aluminum sulfate;

[0121] 16 parts ethanol;

[0122] s2: Take acrylic acid, 2 / 3 of the amount of salt-resistant anti-blocking agent, ammonium persulfate and sodium sulfite, mix and feed them, apply 100 r / min, heat to 40℃ and polymerize for 3 hours to obtain the billet, dry the billet in an oven, control the oven temperature at 100℃, dry for 1 hour, crush and sieve to obtain 60 mesh water-absorbing core.

[0123] s3: Mix glycerol, aluminum sulfate, ethanol, and 1 / 3 of the amount of salt-resistant anti-adhesion additive, control the stirring speed at 100 r / min, and mix for 30 min to obtain a surface crosslinking liquid; set the temperature of the small rotary drum coating machine to 60℃, add the water-absorbing core into the small rotary drum coating machine and preheat for 10 min, then spray the surface crosslinking liquid onto the surface of the water-absorbing core, and cure for 2 h to obtain the water-absorbing material.

[0124] Comparative Example

[0125] Absorbent polymer for diapers (NR-511, Shandong Nuoer Biotechnology Co., Ltd.)

[0126] To facilitate the testing of the relevant performance of a dual-core absorbent material for diapers, the absorbent materials for diapers prepared in Examples 1-5 and the absorbent resin NR-511 for diapers in the comparative example were subjected to performance tests. The specific test data are shown in Table 1.

[0127] Table 1

[0128] Test Project Absorption amount (g / g) Water retention capacity g / g Pressure absorption capacity (g / g) Test Standards GB / T22905-2008 GB / T22905-2008 GB / T22905-2008 Example 1 679 51.7 43.0 Example 2 682 52.3 46.2 Example 3 691 53.1 46.7 Example 4 685 52.4 45.2 Example 5 681 52.1 44.9 NR-511 571 35.0 24.3

[0129] As shown in Table 1, the salt-resistant anti-blocking additive, after participating in polymerization, has better absorption capacity, water retention capacity, and pressure absorption capacity than NR-511 absorbent resin for diapers.

[0130] To facilitate the testing of the relevant performance of a dual-core absorbent material for diapers, the absorbent materials for diapers prepared in Examples 1-5 and the absorbent resin NR-511 for diapers in the comparative example were subjected to performance tests. The specific test data are shown in Table 2.

[0131] Liquid absorption rate measurement:

[0132] The vortex method was used to determine the absorption rate. 50g of 0.9% NaCl solution and a 25mm diameter PTFE stir bar with an iron core were weighed and placed in a 100ml beaker. The beaker was placed on a thermostatic magnetic stirrer set to 25℃ and 600r / min. After observing the vortex in the solution, 2.0g of absorbent material was added, and timing was started. Timing was stopped after the vortex disappeared, and the time t(s) was recorded.

[0133] Table 2

[0134]

[0135]

[0136] As shown in Table 2, the absorbent material for dual-core diapers prepared in this embodiment has a similar absorption ratio and absorption rate to NR-511 in 0.9% NaCl solution. The absorbent material for dual-core diapers prepared in Examples 1-5 has a greater gel strength than NR-511 in 0.9% NaCl solution, indicating that the anti-adhesion of the absorbent material for dual-core diapers prepared in this embodiment is better than that of NR-511.

[0137] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0138] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0139] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0140] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A absorbent material for dual-core diapers, characterized in that, The ingredients, by weight, include the following: 55-67 parts acrylic acid, 10-14 parts salt-resistant anti-blocking agent, 1.4-1.7 parts ammonium persulfate, 0.7-1.0 parts sodium sulfite, 1-2.5 parts glycerol, 0.5-0.9 parts aluminum sulfate, and 16-26 parts ethanol. The salt-resistant anti-blocking agent is prepared by the following method: Step A1: Mix salicylic acid, p-phenylenediamine, zinc powder and DMSO, heat to 150-170℃, stir and react for 1-2 hours to obtain compound A; Step A2: Mix compound A, methylcarbamoyl chloride, aluminum trichloride and DMF, heat to 80-95℃, stir and react for 1-2 hours to obtain compound B; Step A3: Mix compound B, epichlorohydrin, catalyst TEBAC and toluene and feed them into the mixture. Heat the mixture to 80-83℃ and react for 1-1.5 hours. Then cool the mixture to room temperature, add sodium hydroxide, and continue the reaction for 0.5-1 hours to obtain a salt-resistant anti-caking agent.

2. The absorbent material for dual-core diapers according to claim 1, characterized in that, The ratio of salicylic acid, p-phenylenediamine, zinc powder and DMSO is 1 mol: 1 mol: 0.3-0.5 g: 55-60 mL.

3. The absorbent material for dual-core diapers according to claim 2, characterized in that, The ratio of compound A, methylcarbamoyl chloride, aluminum trichloride and DMF is 1 mol: 1.1 mol: 2-3 g: 65-70 mL.

4. The absorbent material for dual-core diapers according to claim 3, characterized in that, The ratio of compound B, epichlorohydrin, catalyst TEBAC, and sodium hydroxide is 1 mol: 1.5 mol: 0.1-0.2 g: 3-5 g.

5. The method for preparing a absorbent material for dual-core diapers according to claim 4, characterized in that, Includes the following steps: Step S1: Take acrylic acid, 2 / 3 of the amount of salt-resistant anti-adhesion agent, ammonium persulfate and sodium sulfite, mix and feed them into the mixture, heat to 40-50℃ and polymerize for 3-5 hours to obtain the billet, dry the billet in an oven, control the oven temperature to 100-110℃, dry for 1 hour, crush and sieve to obtain the water-absorbing core. Step S2: Mix glycerol, aluminum sulfate, ethanol, and 1 / 3 of the salt-resistant anti-adhesion agent and stir for 30 minutes to obtain a surface crosslinking liquid; Set the temperature of the small rotary drum wrapping machine, add the absorbent core into the small rotary drum wrapping machine and preheat for 10-20 minutes. Then spray the surface crosslinking liquid onto the surface of the absorbent core and cure for 2-3 hours to obtain the absorbent material.

6. The method for preparing a absorbent material for dual-core diapers according to claim 5, characterized in that, The absorbent core has a mesh size of 40-60.

7. The method for preparing a absorbent material for dual-core diapers according to claim 5, characterized in that, The temperature in a small rotary drum wrapping machine is set to 60-70℃.

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