Bacteriostatic super absorbent resin as well as preparation method and application thereof

Abstract

The invention discloses antibacterial super absorbent resin as well as a preparation method and application thereof, and belongs to the field of super absorbent resin. The preparation method of the antibacterial super absorbent resin comprises the following steps: S1, carrying out polymerization reaction on an acrylic monomer at 50-90 DEG C to prepare primary super absorbent resin; in the polymerization reaction process, a first antibacterial material is added, the adding amount of the first antibacterial material is 4%-6% of the mass of the acrylic monomer, and the first antibacterial material contains polysaccharide substances and / or flavonoid substances; s2, mixing the primary super absorbent resin with a surface cross-linking agent and a second antibacterial material, and reacting at 100-200 DEG C to prepare antibacterial super absorbent resin; the addition amount of the second antibacterial material is 1.5%-3.5% of the mass of the acrylic monomer, and the second antibacterial material comprises a bacteriostatic agent containing hydroxyl. The antibacterial super absorbent resin disclosed by the invention has good antibacterial performance and water absorption performance at the same time.

Description

Technical Field

[0001] This invention relates to the field of superabsorbent resins, specifically to an antibacterial superabsorbent resin, its preparation method, and its applications. Background Technology

[0002] Superabsorbent polymers (SAPs) are a class of functional polymer materials with a three-dimensional network structure containing strong hydrophilic groups such as carboxyl and hydroxyl groups. They can absorb and retain water hundreds to thousands of times their own weight in water. Since their development in the 1960s, their global production capacity has exceeded 5 million tons per year, with polyacrylic acid resins accounting for over 80%. They are widely used in hygiene products (baby diapers, sanitary napkins, adult diapers, etc.), agricultural water retention, and medical dressings. However, traditional SAPs face serious challenges in the hygiene field: bacteria easily grow in humid and warm environments, leading to odors and health risks, and ordinary superabsorbent polymer products lack active antibacterial capabilities.

[0003] To address the aforementioned issues, existing technologies primarily enhance the antibacterial properties of superabsorbent polymers by introducing antibacterial agents. However, while conventional preparation methods improve the antibacterial properties of antibacterial superabsorbent resins to some extent, they also lead to a decrease in the water absorption ratio of the superabsorbent resin, thus affecting its application. Summary of the Invention

[0004] This invention provides an antibacterial superabsorbent resin, its preparation method, and its application, to solve the problem that the antibacterial and water-absorbing properties of the antibacterial superabsorbent resin prepared by the prior art are difficult to balance.

[0005] In a first aspect, this application provides a method for preparing an antibacterial superabsorbent resin, comprising the following steps: S1. A primary superabsorbent resin is prepared by polymerizing acrylic monomers at 50-90℃. During the polymerization reaction, a first antibacterial material is added. The amount of the first antibacterial material added is 4% to 6% of the mass of the acrylic monomer. The first antibacterial material contains polysaccharides and / or flavonoids. S2. The primary superabsorbent resin is mixed with a surface crosslinking agent and a second antibacterial material, and reacted at 100-200°C to obtain the antibacterial superabsorbent resin. The amount of the second antibacterial material added is 1.5% to 3.5% of the mass of the acrylic monomer, and the second antibacterial material includes an antibacterial agent containing hydroxyl groups.

[0006] In one possible implementation, the first antibacterial material includes one or more of the following: Artemisia argyi extract, Portulaca oleracea extract, Scutellaria baicalensis extract, Sophora flavescens extract, Artemisia argyi extract, Chestnut flower extract, Okra extract, Angelica dahurica extract, Moringa oleracea leaf extract, Dioscorea opposita stem and leaf extract, Guava leaf extract, Alfalfa extract, and Rutin extract, preferably Artemisia argyi extract and / or Portulaca oleracea extract.

[0007] In one possible implementation, the first antibacterial material includes Artemisia argyi extract and Portulaca oleracea extract, with the mass ratio of Artemisia argyi extract to Portulaca oleracea extract being (1-25):5. For example, it can be 1:5, 5:5, 10:5, 15:5, 20:5 or 25:5, preferably (3-5):5.

[0008] In one possible implementation, the second antibacterial material contains organic acids and / or saponins; In one possible implementation, the second antibacterial material includes one or more of the following: honeysuckle extract, citric acid, malic acid, glycyrrhetinic acid, umenic acid, dandelion extract, forsythia leaf extract, soapberry extract, gardenia extract, astragalus stem and leaf extract, mulberry leaf extract, bitter melon extract, bletilla extract, cordyceps extract, lophatherum extract, soybean protein, and xanthan gum. The preferred ingredients are one or more of honeysuckle extract, citric acid, malic acid, glycyrrhetinic acid, umenic acid, dandelion extract, forsythia leaf extract, and soapberry extract, with honeysuckle extract being more preferred.

[0009] Both the first and second antibacterial materials in this application are natural plant extracts. Safety and environmental friendliness: The preference for natural plant extracts as antibacterial materials aligns with the trend towards safety and environmental protection.

[0010] In one possible implementation, the step of using acrylic monomers to perform a polymerization reaction to obtain a primary superabsorbent resin includes: S101. After neutralizing the acrylic monomer with alkali solution, add the primary crosslinking agent and the first antibacterial material, mix and then add the initiator, and perform a polymerization reaction to obtain a polymer colloid. After granulation, obtain gel particles. S102. The gel particles are dried, ground, and sieved to obtain the primary superabsorbent resin.

[0011] In one possible implementation, the alkaline solution includes one or more of sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, and sodium bicarbonate solution; In one possible implementation, the solvent for the alkaline solution is water; In one possible implementation, the mass concentration of the alkaline solution is 20% to 50%. In one possible implementation, the degree of neutralization of the acrylic monomer after neutralization with the alkali solution is 50% to 80%. The degree of neutralization is the ratio of the number of moles of acrylic acid that have been neutralized to the total number of moles of acrylic acid.

[0012] In one possible implementation, the primary crosslinking agent comprises one or more of polyethylene glycol diacrylate, pentaerythritol triallyl ether, polyethylene glycol diallyl ether, pentaerythritol triacrylate, pentaerythritol tetraacrylate, glycerol triacrylate, ethoxylated glycerol triallyl ether, N,N-dimethylbisacrylamide, and trimethylolpropane triacrylate, preferably polyethylene glycol diallyl ether; In one possible implementation, the initiator includes one or more of sodium persulfate, potassium persulfate, ammonium persulfate, sodium bisulfite, sodium thiosulfate, di-tert-butyl peroxide, cumene hydroperoxide, benzoyl peroxide, methyl ethyl ketone peroxide, or azobisisobutyrazoline, preferably sodium persulfate and / or potassium persulfate. In one possible implementation, the initiator is added in an amount of 0.05-0.5 wt% of the acrylic monomer. In one possible implementation, the amount of the primary crosslinking agent added is 0.05-0.5 wt% of the mass of the acrylic monomer.

[0013] In one possible implementation, the surface crosslinking agent includes one or more of polyols, epoxy compounds, and inorganic compounds of metal salts; Optionally, the polyol comprises one or more of ethylene glycol, propylene glycol, glycerol, diethylene glycol, 1,4-butanediol, pentanediol, or polyvinyl alcohol; Optionally, the epoxy compound comprises one or more of ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, and polypropylene glycol diglycidyl ether. Optionally, the metal salt inorganic compound includes one or more of kaolin, alumina, sodium sulfate, magnesium sulfate, aluminum sulfate, magnesium chloride, calcium chloride, aluminum chloride, or zinc chloride. In one possible implementation, the amount of the surface crosslinking agent is 0.5-5 wt% of the mass of the primary superabsorbent resin, preferably 0.8-2 wt%. In one possible implementation, the primary superabsorbent resin has a particle size of 10-800 μm; In one possible implementation, the particle size of the antibacterial superabsorbent resin is 150-710 μm; In one possible implementation, the reaction temperature in S2 is 120-160°C.

[0014] In one possible implementation, in S1, the polymerization reaction temperature is 70-90°C and the reaction time is 2-10 min, preferably 5-8 min; In one possible implementation, the gel particles have a particle size of 1-10 mm.

[0015] In one possible implementation, in S102, the drying tool includes one or more of a belt dryer, a fluidized bed dryer, a chamber dryer, a spray dryer, or a rotary dryer.

[0016] In one possible implementation, in S102, the drying temperature is 100-220°C, preferably 150-200°C.

[0017] Secondly, this application provides an antibacterial superabsorbent resin prepared according to the preparation method described above.

[0018] Thirdly, this application provides an application of the aforementioned antibacterial superabsorbent resin in hygiene products, medical dressings, and agricultural water retention.

[0019] The technical solution of this invention has the following advantages: 1. The preparation method of the antibacterial superabsorbent resin of the present invention includes the following steps: S1, using acrylic monomers to carry out a polymerization reaction at 50-90℃ to obtain a primary superabsorbent resin; during the polymerization reaction, a first antibacterial material is added, the amount of the first antibacterial material added is 4%~6% of the mass of the acrylic monomers, and the first antibacterial material contains polysaccharides and / or flavonoids; S2, the primary superabsorbent resin is mixed with a surface crosslinking agent and a second antibacterial material, and reacted at 100-200℃ to obtain the antibacterial superabsorbent resin; the amount of the second antibacterial material added is 1.5%~3.5% of the mass of the acrylic monomers, and the second antibacterial material includes an antibacterial agent containing hydroxyl groups.

[0020] The method for preparing antibacterial superabsorbent resin provided by the present invention involves adding different types and amounts of antibacterial materials in stages, combined with specific reaction conditions. The resulting product can balance both water absorption rate and antibacterial properties, thereby improving the durability and broad-spectrum antibacterial activity of the superabsorbent resin while ensuring the water absorption rate.

[0021] This application incorporates a first antibacterial material during the polymerization stage. This first antibacterial material contains polysaccharides and / or flavonoids, which remain stable at the polymerization temperature and do not decompose or become inactive. The first antibacterial material is primarily dispersed within the polymer cross-linked network through physical interaction, providing a sustained-release effect. Using this specific type of first antibacterial material prevents clogging of the resin cross-linked network, thus ensuring water absorption while improving antibacterial performance. A second antibacterial material is added during the post-treatment stage. This second antibacterial material includes a hydroxyl-containing antibacterial agent that can surface bond and form ester groups with the surface of the primary superabsorbent resin, preventing excessive loss of the antibacterial agent. The second antibacterial material primarily adheres to the superabsorbent resin surface through chemical interaction, providing direct contact and an immediate contact antibacterial barrier. This dual antibacterial mechanism, introducing the first antibacterial material during polymerization and the second antibacterial material during post-treatment, achieves synergistic antibacterial effects both inside and outside the resin, significantly improving the broad-spectrum and long-lasting antibacterial efficacy.

[0022] When the dosage of the first antibacterial material is less than 4%, the internal antibacterial effect is insufficient; when it is more than 6%, it may interfere with the polymerization reaction and affect the water absorption performance of the resin. When the dosage of the second antibacterial material is less than 1.5%, the surface antibacterial effect is limited; when it is more than 3.5%, it may cause surface clumping or affect the water absorption and pressurized water absorption performance of the resin.

[0023] The process described in this application is controllable and has good compatibility: the steps and proportions for adding antibacterial materials are clearly defined, making it easy to implement industrially, and it has little impact on the inherent superabsorbent properties of the resin. The antibacterial superabsorbent resin prepared by the method described in this application does not have the problem of skin and mucous membrane irritation caused by the dissolution of small molecule antibacterial agents, and the process is simple with good mass production stability. Detailed Implementation

[0024] The following embodiments are provided to better understand the present invention, but the following embodiments do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the scope of protection of the present invention.

[0025] Unless otherwise specified, all experimental steps or conditions in the examples were performed according to conventional experimental procedures and conditions in the art. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0026] Source of raw materials Acrylic acid: Wanhua Chemical Group Co., Ltd.; 32wt% sodium hydroxide solution: Wanhua Chemical Group Co., Ltd. Polyethylene glycol diallyl ether: Shanghai Aladdin Biochemical Technology Co., Ltd.; Artemisia argyi extract: Xi'an Tianyi Biotechnology Co., Ltd.; Purslane extract: Shaanxi Xintianyu Biotechnology Co., Ltd.; Sodium persulfate: Hebei Yatai Electrochemical Co., Ltd.; Aluminum sulfate: Zibo Yiheng Environmental Protection Materials Co., Ltd.; Ethylene glycol diglycidyl ether: Nagase Chemical Co., Ltd., Japan; Honeysuckle extract: Shaanxi Jiahe Botanical Chemical Co., Ltd.; Example 1 This embodiment provides a method for preparing an antibacterial superabsorbent resin, comprising the following steps: Pour 500g of acrylic acid and 100g of deionized water into a beaker, then add 452.5g of 32wt% NaOH solution and stir well; then add 2.5g of polyethylene glycol diallyl ether and 20g of the first antibacterial material (Artemisia argyi extract: Portulaca oleracea extract mass ratio = 3:5) to obtain a mixture.

[0027] The temperature of the mixture is controlled at 70℃. At the same time, 10g of 5wt% sodium persulfate aqueous solution is added to the mixture. Then, the mixture is quickly poured into an open polymerization tank and placed in a 70℃ oven. After polymerization reaction for 5 minutes, a polymer colloid is obtained. After cutting and granulation, gel particles with a particle size of 1-10mm are obtained.

[0028] The gel particles were dried in a belt dryer at 180℃ for 40 minutes. After grinding and sieving, a primary superabsorbent resin was obtained with a particle size between 150-710μm. The specific particle size distribution was 150-300μm: 300-500μm: 500-710μm in a mass ratio of 2:5:3.

[0029] Take 100g of primary superabsorbent resin and spray it evenly onto the surface with a surface crosslinking agent solution formed by mixing 0.8g of ethylene glycol diglycidyl ether and 3.2g of water. After mixing evenly, place the primary superabsorbent resin sprayed with the surface crosslinking agent solution into an oven at 160℃ for 30min. Then, mix the obtained product evenly with 1.5g of the second antibacterial material (honeysuckle extract) to obtain an antibacterial superabsorbent resin.

[0030] Example 2 This embodiment provides a method for preparing an antibacterial superabsorbent resin, comprising the following steps: Pour 500g of acrylic acid and 100g of deionized water into a beaker, then add 452.5g of 32wt% NaOH solution and stir well; then add 2.5g of polyethylene glycol diallyl ether and 30g of the first antibacterial material (purslane extract) to obtain a mixture.

[0031] The temperature of the mixture is controlled at 70℃. At the same time, 10g of 5wt% potassium persulfate aqueous solution is added to the mixture. Then, the mixture is quickly poured into an open polymerization tank and placed in a 90℃ oven. After the polymerization reaction is carried out for 8 minutes, a polymer colloid is obtained. After cutting and granulation, gel particles with a particle size of 1-10mm are obtained.

[0032] The gel particles were dried in a belt dryer at 160℃ for 40 minutes. After grinding and sieving, a primary superabsorbent resin was obtained with a particle size between 150-710μm. The specific particle size distribution was 150-300μm: 300-500μm: 500-710μm in a mass ratio of 2:5:3.

[0033] Take 100g of primary superabsorbent resin and spray it evenly onto the surface with a surface crosslinking agent solution formed by mixing 0.8g of ethylene glycol diglycidyl ether and 3.2g of water. After mixing evenly, place the primary superabsorbent resin sprayed with the surface crosslinking agent solution into an oven at 160℃ for 30min. Then, mix the obtained product evenly with 3.5g of the second antibacterial material (honeysuckle extract) to obtain an antibacterial superabsorbent resin.

[0034] Example 3 This embodiment provides a method for preparing an antibacterial superabsorbent resin, comprising the following steps: Pour 500g of acrylic acid and 100g of deionized water into a beaker, then add 452.5g of 32wt% NaOH solution and stir well; then add 2.5g of N,N-dimethylbisacrylamide and 25g of the first antibacterial material (Artemisia argyi extract) to obtain a mixture.

[0035] The temperature of the mixture is controlled at 70℃. At the same time, 10g of 5wt% sodium persulfate aqueous solution is added to the mixture. Then, the mixture is quickly poured into an open polymerization tank and placed in an 80℃ oven. After polymerization reaction for 6 minutes, a polymer colloid is obtained. After cutting and granulation, gel particles with a particle size of 1-10mm are obtained.

[0036] The gel particles were dried in a belt dryer at 170℃ for 40 minutes. After grinding and sieving, a primary superabsorbent resin with a particle size between 150-710μm was obtained.

[0037] Take 100g of primary superabsorbent resin and spray it evenly onto the surface with a surface crosslinking agent solution formed by mixing 0.8g of ethylene glycol diglycidyl ether and 3.2g of water. After mixing evenly, place the primary superabsorbent resin sprayed with the surface crosslinking agent solution into an oven at 160℃ for 30min. Then, mix the obtained product evenly with 2.5g of the second antibacterial material (citric acid) to obtain an antibacterial superabsorbent resin.

[0038] Comparative Example 1 This comparative example provides a method for preparing a superabsorbent resin, comprising the following steps: Pour 500g of acrylic acid and 100g of deionized water into a beaker, then add 452.5g of 32wt% NaOH solution and stir well; then add 2.5g of polyethylene glycol diallyl ether to obtain a mixture.

[0039] The temperature of the mixture is controlled at 70℃. At the same time, 10g of 5wt% sodium persulfate aqueous solution is added to the mixture. Then, the mixture is quickly poured into an open polymerization tank and placed in a 70℃ oven. After polymerization reaction for 5 minutes, a polymer colloid is obtained. After cutting and granulation, gel particles with a particle size of 1-10mm are obtained.

[0040] The gel particles were dried in a belt dryer at 180°C for 40 minutes. After grinding and sieving, a primary superabsorbent resin with a particle size between 150-710 μm was obtained.

[0041] Take 100g of primary superabsorbent resin and spray it evenly onto the surface with a surface crosslinking agent solution formed by mixing 0.8g of ethylene glycol diglycidyl ether and 3.2g of water. After mixing evenly, place the primary superabsorbent resin sprayed with the surface crosslinking agent solution into an oven at 160℃ for 30 minutes to obtain the superabsorbent resin product.

[0042] The properties of superabsorbent resin products are shown in Table 1.

[0043] Comparative Example 2 This comparative example provides a method for preparing an antibacterial superabsorbent resin, comprising the following steps: Pour 500g of acrylic acid and 100g of deionized water into a beaker, then add 452.5g of 32wt% NaOH solution and stir well; then add 2.5g of polyethylene glycol diallyl ether and 40g of the first antibacterial material (Artemisia argyi extract: Portulaca oleracea extract mass ratio = 3:5) to obtain a mixture.

[0044] The temperature of the mixture is controlled at 70℃. At the same time, 10g of 5wt% sodium persulfate aqueous solution is added to the mixture. Then, the mixture is quickly poured into an open polymerization tank and placed in a 70℃ oven. After polymerization reaction for 5 minutes, a polymer colloid is obtained. After cutting and granulation, gel particles with a particle size of 1-10mm are obtained.

[0045] The gel particles were dried in a belt dryer at 180°C for 40 minutes. After grinding and sieving, a primary superabsorbent resin with a particle size between 150-710 μm was obtained.

[0046] Take 100g of primary superabsorbent resin and spray it evenly onto the surface with a surface crosslinking agent solution formed by mixing 0.8g of ethylene glycol diglycidyl ether and 3.2g of water. After mixing evenly, place the primary superabsorbent resin sprayed with the surface crosslinking agent solution into an oven at 160℃ for 30min. Then, mix the obtained superabsorbent resin with 1.5g of the second antibacterial material (honeysuckle extract) evenly to obtain an antibacterial superabsorbent resin.

[0047] Comparative Example 3 This comparative example provides a method for preparing an antibacterial superabsorbent resin, comprising the following steps: Pour 500g of acrylic acid and 100g of deionized water into a beaker, then add 452.5g of 32wt% NaOH solution and stir well; then add 2.5g of polyethylene glycol diallyl ether and 20g of the first antibacterial material (Artemisia argyi extract: Portulaca oleracea extract mass ratio = 3:5) to obtain a mixture.

[0048] The temperature of the mixture is controlled at 70℃. At the same time, 10g of 5wt% sodium persulfate aqueous solution is added to the mixture. Then, the mixture is quickly poured into an open polymerization tank and placed in a 70℃ oven. After polymerization reaction for 5 minutes, a polymer colloid is obtained. After cutting and granulation, gel particles with a particle size of 1-10mm are obtained.

[0049] The gel particles were dried in a belt dryer at 180°C for 40 minutes. After grinding and sieving, a primary superabsorbent resin with a particle size between 150-710 μm was obtained.

[0050] Take 100g of primary superabsorbent resin and spray it evenly onto the surface with a surface crosslinking agent solution formed by mixing 0.8g of ethylene glycol diglycidyl ether and 3.2g of water. After mixing evenly, place the primary superabsorbent resin sprayed with the surface crosslinking agent solution into an oven at 160℃ for 30min. Then, mix the obtained superabsorbent resin with 5g of the second antibacterial material (honeysuckle extract) evenly to obtain an antibacterial superabsorbent resin.

[0051] Comparative Example 4 This comparative example provides a method for preparing an antibacterial superabsorbent resin, comprising the following steps: Pour 500g of acrylic acid and 100g of deionized water into a beaker, then add 452.5g of 32wt% NaOH solution and stir well; then add 2.5g of polyethylene glycol diallyl ether and 20g of the first antibacterial material (honeysuckle extract) to obtain a mixture.

[0052] The temperature of the mixture is controlled at 70℃. At the same time, 10g of 5wt% sodium persulfate aqueous solution is added to the mixture. Then, the mixture is quickly poured into an open polymerization tank and placed in a 70℃ oven. After polymerization reaction for 5 minutes, a polymer colloid is obtained. After cutting and granulation, gel particles with a particle size of 1-10mm are obtained.

[0053] The gel particles were dried in a belt dryer at 180°C for 40 minutes. After grinding and sieving, a primary superabsorbent resin with a particle size between 150-710 μm was obtained.

[0054] Take 100g of primary superabsorbent resin and spray it evenly onto the surface with a surface crosslinking agent solution formed by mixing 0.8g of ethylene glycol diglycidyl ether and 3.2g of water. After mixing evenly, place the primary superabsorbent resin sprayed with the surface crosslinking agent solution into an oven at 160℃ for 30min. Then, mix the obtained product with 1.5g of the second antibacterial material (Artemisia argyi extract: Portulaca oleracea extract = 3:5) evenly to obtain antibacterial superabsorbent resin.

[0055] Test case (1) Water absorption performance test According to GB / T 22875-2018, weigh 0.200g of the antibacterial superabsorbent resin prepared in each example and comparative example, pour it all into the bottom of the tea bag, and seal the tea bag; prepare a blank tea bag, seal it, and test it together with the tea bag containing the antibacterial superabsorbent resin prepared above: soak it in 0.9% NaCl solution for 30min, then lift it out and hang it for 10min, weigh the tea bag to be tested to obtain the mass m1, weigh the blank tea bag to obtain the mass mb1, then place it in a centrifuge and centrifuge at 250g centrifugal force for 3min, weigh the tea bag to be tested to obtain the mass m2, weigh the blank tea bag to obtain the mass mb2, and calculate the water absorption ratio (g / g) and water retention ratio (g / g).

[0056] Water absorption ratio = (m1 - mb1 - 0.200g) / 0.200g; Water retention ratio (CRC) = (m2 - mb2 - 0.200g) / 0.200g.

[0057] AUL (Adjusted Uptake Limit): The uptake ratio (g / g) was determined over 30 minutes at a pressure of 0.7 psi, in accordance with GB / T 22875-2018.

[0058] (2) Antibacterial performance test Antibacterial rate: According to GB / T 15979-2024, Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC25922) were used as test species to calculate the 24-hour antibacterial rate (%).

[0059] The test results are shown in Table 1.

[0060] Table 1. Performance test results of superabsorbent resin products in each example and comparative example.

[0061] As shown in Table 1, the CRC of the embodiments of this application is ≥33g / g, the water absorption ratio is ≥60g / g, the AUL is ≥22g / g, the antibacterial rate against Staphylococcus aureus is ≥95%, and the antibacterial rate against Escherichia coli is ≥95%. That is, the superabsorbent resin prepared in this application has both high water absorption and antibacterial properties.

[0062] In Comparative Example 4, the addition of the second antibacterial agent during the polymerization stage increases the gel strength of the superabsorbent resin, thereby reducing the water absorption ratio and water retention capacity (CRC) and increasing the pressure absorption.

[0063] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing an antibacterial superabsorbent resin, characterized in that, Includes the following steps: S1. A primary superabsorbent resin is prepared by polymerizing acrylic monomers at 50-90℃. During the polymerization reaction, a first antibacterial material is added. The amount of the first antibacterial material added is 4% to 6% of the mass of the acrylic monomer. The first antibacterial material contains polysaccharides and / or flavonoids. S2. The primary superabsorbent resin is mixed with a surface crosslinking agent and a second antibacterial material, and reacted at 100-200°C to obtain the antibacterial superabsorbent resin. The amount of the second antibacterial material added is 1.5% to 3.5% of the mass of the acrylic monomer, and the second antibacterial material includes an antibacterial agent containing hydroxyl groups.

2. The method for preparing the antibacterial superabsorbent resin according to claim 1, characterized in that, The first antibacterial material includes one or more of the following: Artemisia argyi extract, Portulaca oleracea extract, Scutellaria baicalensis extract, Sophora flavescens extract, Artemisia argyi extract, Chestnut flower extract, Okra extract, Angelica dahurica extract, Moringa leaf extract, Sweet potato stem and leaf extract, Guava leaf extract, Alfalfa extract, and Rutin extract, preferably Artemisia argyi extract and / or Portulaca oleracea extract.

3. The method for preparing the antibacterial superabsorbent resin according to claim 2, characterized in that, The first antibacterial material includes Artemisia argyi extract and Portulaca oleracea extract, with a mass ratio of Artemisia argyi extract to Portulaca oleracea extract of (1-25):

5.

4. The method for preparing the antibacterial superabsorbent resin according to claim 1, characterized in that, The second antibacterial material contains organic acids and / or saponins; Optionally, the second antibacterial material includes one or more of the following: honeysuckle extract, citric acid, malic acid, glycyrrhetinic acid, umenic acid, dandelion extract, forsythia leaf extract, soapberry extract, gardenia extract, astragalus stem and leaf extract, mulberry leaf extract, bitter melon extract, bletilla extract, cordyceps extract, lophatherum extract, soybean protein, and xanthan gum. The preferred ingredients are one or more of honeysuckle extract, citric acid, malic acid, glycyrrhetinic acid, umenic acid, dandelion extract, forsythia leaf extract, and soapberry extract, with honeysuckle extract being more preferred.

5. The method for preparing the antibacterial superabsorbent resin according to any one of claims 1-4, characterized in that, The steps for preparing a primary superabsorbent resin by polymerizing acrylic monomers include: S101. After neutralizing the acrylic monomer with alkali solution, add the primary crosslinking agent and the first antibacterial material, mix and then add the initiator, and perform a polymerization reaction to obtain a polymer colloid. After granulation, obtain gel particles. S102. The gel particles are dried, ground, and sieved to obtain the primary superabsorbent resin.

6. The method for preparing the antibacterial superabsorbent resin according to claim 5, characterized in that, At least one of the following conditions must be met: (1) The alkaline solution includes one or more of sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, and sodium bicarbonate solution; (2) The primary crosslinking agent includes one or more of polyethylene glycol diacrylate, pentaerythritol triallyl ether, polyethylene glycol diallyl ether, pentaerythritol triacrylate, pentaerythritol tetraacrylate, glycerol triacrylate, ethoxylated glycerol triallyl ether, N,N-dimethylbisacrylamide, and trimethylolpropane triacrylate, preferably polyethylene glycol diallyl ether; (3) The initiator includes one or more of sodium persulfate, potassium persulfate, ammonium persulfate, sodium bisulfite, sodium thiosulfate, di-tert-butyl peroxide, cumene hydroperoxide, benzoyl peroxide, methyl ethyl ketone peroxide, or azobisisobutyrazoline, preferably sodium persulfate and / or potassium persulfate; (4) The amount of the initiator added is 0.05-0.5 wt% of the mass of the acrylic monomer; (5) The amount of the primary crosslinking agent added is 0.05-0.5 wt% of the mass of the acrylic monomer.

7. The method for preparing the antibacterial superabsorbent resin according to any one of claims 1-4, characterized in that, At least one of the following conditions must be met: (1) The surface crosslinking agent includes one or more of polyols, epoxy compounds, and inorganic compounds of metal salts; Optionally, the polyol comprises one or more of ethylene glycol, propylene glycol, glycerol, diethylene glycol, 1,4-butanediol, pentanediol, or polyvinyl alcohol; Optionally, the epoxy compound comprises one or more of ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, and polypropylene glycol diglycidyl ether. Optionally, the metal salt inorganic compound includes one or more of kaolin, alumina, sodium sulfate, magnesium sulfate, aluminum sulfate, magnesium chloride, calcium chloride, aluminum chloride, or zinc chloride. (2) The mass of the surface crosslinking agent is 0.5-5 wt% of the mass of the primary superabsorbent resin, preferably 0.8-2 wt%; (3) The particle size of the primary superabsorbent resin is 10-800 μm; (4) In S2, the reaction temperature is 120-160℃.

8. The method for preparing the antibacterial superabsorbent resin according to claim 5, characterized in that, At least one of the following conditions must be met: (1) In S1, the polymerization reaction temperature is 70-90℃ and the reaction time is 2-10 min, preferably 5-8 min; (2) The particle size of the gel particles is 1-10 mm.

9. An antibacterial superabsorbent resin prepared by the preparation method according to any one of claims 1-8.

10. The application of the antibacterial superabsorbent resin of claim 9 in sanitary products, medical dressings, and agricultural water retention.

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