Antibacterial super absorbent resin and preparation method thereof

Abstract

The invention relates to the technical field of resin materials, in particular to antibacterial super absorbent resin and a preparation method thereof.The antibacterial super absorbent resin is prepared from, by weight, 50-100 parts of an antibacterial agent, 80-120 parts of acrylic acid, 100-200 parts of an alkaline agent solution, 0.5-2 parts of a cross-linking agent, 600-800 parts of water, 2-5 parts of an initiator, 2-5 parts of a reducing agent and 60-120 parts of a post-treatment agent; various hydrophilic groups are introduced into the super absorbent resin, and the super absorbent resin not only has amino, hydroxyl and other plasma groups, but also has quaternary ammonium salt and other nonionic groups. Chitosan is chemically modified to improve the water solubility and antibacterial property of the super absorbent resin, quaternized carboxyethyl chitosan with good antibacterial property is used as a bio-based skeleton to be subjected to graft copolymerization with monomers such as acrylic acid and the like, a core-shell structure is constructed by adopting a surface crosslinking technology, and the super absorbent resin with good antibacterial property is prepared.

Description

Technical Field

[0001] This invention relates to the field of resin materials technology, and in particular to an antibacterial superabsorbent resin and its preparation method. Background Technology

[0002] Superabsorbent polymer (SAP), a functional polymer material capable of absorbing hundreds or even thousands of times its own weight in water, has been widely used in hygiene products, agricultural water retention, medical dressings and other fields since its invention in the 1960s.

[0003] In terms of application performance, traditional superabsorbent polymers (SAPs) face several prominent technical bottlenecks. Firstly, insufficient antibacterial properties are a key factor restricting their application in the hygiene and medical fields. Especially when used in intimate hygiene products such as sanitary napkins and diapers, as well as wound dressings, microorganisms easily multiply in the moist environment, leading not only to unpleasant odors but also potentially causing skin infections, secondary wound infections, and other health problems.

[0004] To impart antibacterial properties to superabsorbent polymers (SAPs), inorganic antibacterial agents such as nano-silver are introduced. Nano-silver effectively kills or inhibits bacteria through the release of silver ions or contact sterilization. However, nano-silver disrupts the polymer network structure, occupies water molecule space, restricts chain extension, hinders water molecule diffusion, and reduces SAP strength, significantly decreasing its water retention capacity and pressurized absorption capacity. Chitosan, a natural aminopolysaccharide derived from the shells of marine crustaceans, possesses good biocompatibility, biodegradability, and inherent antibacterial activity. However, natural chitosan itself suffers from poor water solubility, instability under acidic conditions, and limited hygroscopic and moisturizing capabilities, severely restricting its direct application in superabsorbent polymers.

[0005] CN114854161A discloses an antibacterial and deodorizing superabsorbent resin and its preparation method, comprising a superabsorbent resin and an antibacterial and deodorizing composite material on the superabsorbent resin; the antibacterial and deodorizing composite material includes an antibacterial material and a deodorizing material; the antibacterial material includes polyhexylguanidine hydrochloride and / or nano-silver; the deodorizing material includes 4-ethyl-4-daidzeinyl methyl sulfate morpholine and / or zinc ricinoleate. This method provides an antibacterial and deodorizing superabsorbent resin composite material with a specific structure and composition, selecting a specific combination of antibacterial and deodorizing materials, and further selecting partially hydrolyzed polyacrylamide as the superabsorbent resin matrix, thereby obtaining a superabsorbent resin composite material with excellent antibacterial and deodorizing properties. The preparation method provided by this invention is simple, has mild conditions, strong controllability, stable raw materials, and low process cost, making it more suitable for industrial promotion and application.

[0006] CN113736200A discloses an antibacterial superabsorbent resin composite material and its preparation method. The composite material comprises: 0.2-2 parts by weight of a high-molecular-weight guanidine antibacterial agent; 0.1-2 parts by weight of a single-chain small-molecule quaternary ammonium salt antibacterial agent; 0.1-2 parts by weight of a double-chain small-molecule quaternary ammonium salt antibacterial agent; and 94-99.6 parts by weight of superabsorbent resin. It is obtained through blending and drying processes. This method, through the screening and compounding of antibacterial agents, provides an antibacterial agent compound with good compatibility with the superabsorbent resin system. This antibacterial agent compound is easily soluble in water, and utilizes the water absorption characteristics of the superabsorbent resin to successfully and uniformly incorporate the antibacterial components into the superabsorbent resin. This antibacterial agent compound can exert a synergistic antibacterial effect in the superabsorbent resin matrix, achieving excellent bactericidal effects with only a small amount added, and is inexpensive. The production process of this antibacterial superabsorbent resin composite material is simple, it has excellent antibacterial functionality, and it does not adversely affect the absorption performance of the original resin.

[0007] CN111471137A discloses a superabsorbent resin, its preparation method, and its applications. The resin comprises an attapulgite matrix and modified cellulose loaded on its surface. The modified cellulose includes cellulose and acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid grafted and copolymerized onto its backbone. This method uses attapulgite as the base material. Acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid undergo an addition polymerization reaction with cellulose, causing the acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid to be grafted and copolymerized onto the molecular backbone of the cellulose. The cellulose is loaded onto the active sites of the attapulgite, effectively improving the resin's biodegradability, water absorption and retention capacity, sustained-release properties, and absorption capacity for urea solution.

[0008] Therefore, to address the above shortcomings, there is a need to provide a novel antibacterial superabsorbent resin for hygiene products. Summary of the Invention

[0009] The technical problem to be solved by the present invention is that the existing superabsorbent polymers have poor antibacterial effects. In view of the defects in the prior art, the present invention provides an antibacterial superabsorbent polymer and its preparation method.

[0010] To solve the above-mentioned technical problems, on the one hand, the present invention provides an antibacterial superabsorbent resin, wherein the raw materials for preparing the antibacterial superabsorbent resin include, by weight: 50-100 parts of antibacterial agent, 80-120 parts of acrylic acid, 100-200 parts of alkaline agent solution, 0.5-2 parts of crosslinking agent, 600-800 parts of water, 2-5 parts of initiator, 2-5 parts of reducing agent, and 60-120 parts of post-treatment agent.

[0011] The antibacterial agent is present in parts by weight of 50 to 100, for example, 50, 60, 70, 80, 90 or 100 parts.

[0012] Preferably, the antibacterial agent is quaternized carboxyethyl chitosan.

[0013] The antibacterial agent used in this invention introduces hydrophilic carboxyethyl groups into chitosan molecules through chemical modification to obtain quaternized carboxyethyl chitosan. This significantly improves the water solubility of chitosan and greatly enhances its positive charge, enabling it to effectively destroy negatively charged bacterial cell membranes through electrostatic interaction, thereby exhibiting stronger antibacterial activity. At the same time, its hygroscopicity and moisturizing properties are also significantly improved.

[0014] Preferably, the mass ratio of the antibacterial agent to water is 1:(40~100), for example, it can be 1:40, 1:50, 1:60, 1:70, 1:80, 1:90, 1:100, etc.

[0015] In existing technologies, CN106188552A utilizes a low-temperature alkalization method during the preparation of carboxyalkyl chitosan. This method facilitates the opening of hydrogen bonds in chitosan molecules, allowing the alkali solution to penetrate more easily into the chitosan molecules. Consequently, the carboxyalkyl side chains are more uniformly grafted onto the chitosan backbone, resulting in a stable structure and good solubility of the obtained carboxyalkyl chitosan. Methods for preparing chitosan-based natural polymer-modified crude oil desalting demulsifiers can be achieved by selecting sodium carboxylate, N,N-dimethylalkylamine, and polyether with different carbon chain lengths, or by changing the ratio of reactants, reaction temperature, and time. These factors can alter the molecular structure of the demulsifier, such as molecular weight, degree of substitution, hydrophobic segment length, and aggregate structure, thereby controlling the desalting and dehydration effect of the synthesized high-efficiency demulsifier to suit crude oils with different properties (different origins, varying salt and water contents).

[0016] Acrylic acid 80-120 parts, for example, 80 parts, 90 parts, 100 parts, 110 parts or 120 parts, etc.

[0017] The alkaline agent solution is 100 to 200 parts, for example, 100 parts, 120 parts, 150 parts, 170 parts, 180 parts or 200 parts, etc.

[0018] Preferably, the alkaline agent includes any one or a combination of at least two of sodium hydroxide, potassium hydroxide, or sodium bicarbonate.

[0019] The mass concentration of the alkaline agent solution is 40%~60%.

[0020] The crosslinking agent is 0.5 to 2 parts, for example, it can be 0.5 parts, 1 part, 1.5 parts or 2 parts, etc.

[0021] Preferably, the crosslinking agent comprises any one or a combination of at least two of 2-acryloylamino-2-methylpropanesulfonic acid, 2,3-epoxypropyltrimethylammonium chloride, sodium methacrylate, and trimethylolpropane triacrylate (TMPTA).

[0022] Use 600 to 800 parts of water, for example, 600, 650, 700, 750, or 800 parts.

[0023] The initiator is 2 to 5 parts, for example, 2, 3, 4 or 5 parts, etc.

[0024] Preferably, the initiator comprises any one or a combination of at least two of potassium persulfate, ammonium persulfate, or sodium persulfate.

[0025] The reducing agent is 2 to 5 parts, for example, 2, 3, 4 or 5 parts, etc.

[0026] Preferably, the reducing agent includes any one or a combination of at least two of sodium bisulfite, sodium sulfite, or sodium thiosulfate.

[0027] The post-treatment agent is 60 to 120 parts, for example, 60 parts, 80 parts, 100 parts, 110 parts or 120 parts, etc.

[0028] Preferably, the post-treatment agent is a mixed solution of epichlorohydrin, glycerol and water, wherein the mass ratio of epichlorohydrin, glycerol and water is 1:1:(500~1000), for example, it can be 1:1:500, 1:1:700, 1:1:900 or 1:1:1000, etc.

[0029] As a preferred technical solution, the raw materials for preparing the antibacterial superabsorbent resin include, by weight, 60 parts of antibacterial agent, 100 parts of acrylic acid, 120 parts of alkaline agent solution, 1 part of crosslinking agent, 750 parts of water, 3 parts of initiator, 3 parts of reducing agent, and 110 parts of post-treatment agent.

[0030] The superabsorbent resin provided by this invention is suitable for developing water-absorbing and antibacterial products, and is especially suitable for use in hygiene products.

[0031] On the other hand, the present invention provides a method for preparing the antibacterial superabsorbent resin, the method comprising: dissolving an antibacterial agent in water to obtain an antibacterial agent solution, heating to remove oxygen, then adding a solution of acrylic acid, an alkaline agent, a crosslinking agent, an initiator and a reducing agent to the antibacterial agent solution, reacting, and then performing post-treatment with a post-treatment agent to obtain the antibacterial superabsorbent resin.

[0032] In this invention, when initiators and other agents are added, the reaction temperature is 80°C, and the reaction is maintained at this temperature for 4-6 hours. The resulting colloid is then granulated and dried. After drying, a post-treatment agent is used for swelling.

[0033] Preferably, the temperature for heating and deoxygenation is 80~90℃, for example, it can be 80℃, 84℃, 88℃ or 90℃.

[0034] The post-processing time is 20 to 40 minutes, for example, it can be 20 minutes, 25 minutes, 30 minutes, 35 minutes or 40 minutes.

[0035] Implementing this invention has the following beneficial effects: This invention introduces various hydrophilic groups into a superabsorbent resin, including not only ionic groups such as amino and hydroxyl groups, but also nonionic groups such as quaternary ammonium salts. By chemically modifying chitosan to enhance its water solubility and antibacterial properties, and using quaternized carboxyethyl chitosan with good antibacterial properties as a bio-based framework, it is grafted and copolymerized with monomers such as acrylic acid. A "core-shell" structure is then constructed using surface crosslinking technology, resulting in a superabsorbent resin with excellent antibacterial properties. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In this invention, the antibacterial agent quaternized carboxyethyl chitosan is prepared by the following process: Chitosan was dispersed in anhydrous methanol. Then, 80% sodium hydroxide solution was added to a three-necked flask, and the mixture was stirred vigorously and refluxed at 50°C for 1 hour. Chloroacetic acid ethanol solution was slowly added dropwise, and the reaction continued for 5 hours. After the reaction, the pH of the system was adjusted to 7.0 using glacial acetic acid, causing the product to precipitate. The precipitate was washed with 90% anhydrous methanol and filtered, repeated three times, and then filtered again. Finally, it was dried at 70°C and ground to obtain powdered carboxyethyl chitosan. The carboxyethyl chitosan was added to 90% isopropanol solution and stirred until completely dissolved. At 80°C, glycidyltriethylammonium chloride was slowly added in portions, and the reaction was stirred continuously for 5 hours. After the reaction, the product precipitated in anhydrous methanol, filtered, soaked, and washed, and finally dried at 80°C to obtain pale yellow quaternized carboxyethyl chitosan.

[0038] Example 1 This embodiment provides an antibacterial superabsorbent resin. 60 parts antibacterial agent, 100 parts acrylic acid, 120 parts 50% sodium hydroxide solution, 1 part 2,3-epoxypropyltrimethylammonium chloride, 750 parts water, 3 parts ammonium persulfate, 3 parts sodium sulfite, and 110 parts post-treatment agent.

[0039] The preparation process is as follows: (1) Dissolve the antibacterial agent in deionized water, heat it in a water bath to 80°C, purge with nitrogen to remove oxygen for 10 min, then cool it down to 50°C and continue to remove oxygen for 5 min; (2) Add acrylic acid to an alkaline solution to prepare an acrylic acid solution. After stirring and dissolving, add crosslinking agent, initiator and reducing agent solution in sequence. Pour nitrogen gas to mix it evenly. Add it dropwise to the above antibacterial agent solution. Heat to 80℃ and react for 1 h. When the system becomes viscous, stop purging nitrogen gas. When the temperature does not rise, the reaction is complete. Keep warm for 5 h. (3) Finally, the colloid is obtained, the colloid is granulated, and the granules are dried at 105°C. (4) Soak the dried granules in the treatment solution to swell for 30 min. Then dry the filtered resin granules at 140℃ for 40 min; after passing the dried granules through a 50-mesh sieve, the antibacterial superabsorbent resin is obtained.

[0040] Example 2 This embodiment provides an antibacterial superabsorbent resin. 100 parts antibacterial agent, 120 parts acrylic acid, 200 parts 50% sodium hydroxide solution, 2 parts 2,3-epoxypropyltrimethylammonium chloride, 800 parts water, 5 parts ammonium persulfate, 5 parts sodium sulfite, and 120 parts post-treatment agent.

[0041] The preparation process is as follows: (1) Dissolve the antibacterial agent in deionized water, heat it in a water bath to 80°C, purge with nitrogen to remove oxygen for 10 min, then cool it down to 50°C and continue to remove oxygen for 5 min; (2) Add acrylic acid to an alkaline solution to prepare an acrylic acid solution. After stirring and dissolving, add crosslinking agent, initiator and reducing agent solution in sequence. Pour nitrogen gas to mix it evenly. Add it dropwise to the above antibacterial agent solution. Heat to 80℃ and react for 1 h. When the system becomes viscous, stop purging nitrogen gas. When the temperature does not rise, the reaction is complete. Keep warm for 5 h. (3) Finally, the colloid is obtained, the colloid is granulated, and the granules are dried at 105°C. (4) Soak the dried granules in the treatment solution to swell for 30 min. Then dry the filtered resin granules at 140℃ for 40 min; after passing the dried granules through a 50-mesh sieve, the antibacterial superabsorbent resin is obtained.

[0042] Example 3 This embodiment provides an antibacterial superabsorbent resin. 50 parts antibacterial agent, 80 parts acrylic acid, 100 parts 50% sodium hydroxide solution, 0.5 parts 2-acrylamido-2-methylpropanesulfonic acid, 600 parts water, 2 parts ammonium persulfate, 2 parts sodium sulfite, and 60 parts post-treatment agent.

[0043] The preparation process is as follows: (1) Dissolve the antibacterial agent in deionized water, heat it in a water bath to 80°C, purge with nitrogen to remove oxygen for 10 min, then cool it down to 50°C and continue to remove oxygen for 5 min; (2) Add acrylic acid to an alkaline solution to prepare an acrylic acid solution. After stirring and dissolving, add crosslinking agent, initiator and reducing agent solution in sequence. Pour nitrogen gas to mix it evenly. Add it dropwise to the above antibacterial agent solution. Heat to 80℃ and react for 1 h. When the system becomes viscous, stop purging nitrogen gas. When the temperature does not rise, the reaction is complete. Keep warm for 5 h. (3) Finally, the colloid is obtained, the colloid is granulated, and the granules are dried at 105°C. (4) Soak the dried granules in the treatment solution to swell for 30 min. Then dry the filtered resin granules at 140℃ for 40 min; after passing the dried granules through a 50-mesh sieve, the antibacterial superabsorbent resin is obtained.

[0044] Example 4 This embodiment provides an antibacterial superabsorbent resin. 60 parts antibacterial agent, 100 parts acrylic acid, 120 parts 50% sodium hydroxide solution, 1 part 2-acrylamido-2-methylpropanesulfonic acid, 650 parts water, 3 parts ammonium persulfate, 3 parts sodium sulfite, and 110 parts post-treatment agent.

[0045] The preparation process is as follows: (1) Dissolve the antibacterial agent in deionized water, heat it in a water bath to 80°C, purge with nitrogen to remove oxygen for 10 min, then cool it down to 50°C and continue to remove oxygen for 5 min; (2) Add acrylic acid to an alkaline solution to prepare an acrylic acid solution. After stirring and dissolving, add crosslinking agent, initiator and reducing agent solution in sequence. Pour nitrogen gas to mix it evenly. Add it dropwise to the above antibacterial agent solution. Heat to 80℃ and react for 1 h. When the system becomes viscous, stop purging nitrogen gas. When the temperature does not rise, the reaction is complete. Keep warm for 5 h. (3) Finally, the colloid is obtained, the colloid is granulated, and the granules are dried at 105°C. (4) Soak the dried granules in the treatment solution to swell for 30 min. Then dry the filtered resin granules at 140℃ for 40 min; after passing the dried granules through a 50-mesh sieve, the antibacterial superabsorbent resin is obtained.

[0046] Example 5 This embodiment provides an antibacterial superabsorbent resin. 60 parts antibacterial agent, 100 parts acrylic acid, 120 parts 50% sodium hydroxide solution, 1 part 2,3-epoxypropyltrimethylammonium chloride, 750 parts water, 3 parts potassium persulfate, 3 parts sodium bisulfite, and 110 parts post-treatment agent.

[0047] The preparation process is as follows: (1) Dissolve the antibacterial agent in deionized water, heat it in a water bath to 80°C, purge with nitrogen to remove oxygen for 10 min, then cool it down to 50°C and continue to remove oxygen for 5 min; (2) Add acrylic acid to an alkaline solution to prepare an acrylic acid solution. After stirring and dissolving, add crosslinking agent, initiator and reducing agent solution in sequence. Pour nitrogen gas to mix it evenly. Add it dropwise to the above antibacterial agent solution. Heat to 80℃ and react for 1 h. When the system becomes viscous, stop purging nitrogen gas. When the temperature does not rise, the reaction is complete. Keep warm for 5 h. (3) Finally, the colloid is obtained, the colloid is granulated, and the granules are dried at 105°C. (4) Soak the dried granules in the treatment solution to swell for 30 min. Then dry the filtered resin granules at 140℃ for 40 min; after passing the dried granules through a 50-mesh sieve, the antibacterial superabsorbent resin is obtained.

[0048] Comparative Example 1 This comparative example is basically the same as Example 1, except that the raw material components do not include antibacterial agents.

[0049] Comparative Example 2 This comparative example is basically the same as Example 1, except that the raw material components do not include antibacterial agents and the acrylic acid content is 200 parts.

[0050] Comparative Example 3 This comparative example is basically the same as Example 1, except that the quaternized carboxyethyl chitosan in Example 1 is replaced with an equal amount of chitosan.

[0051] Comparative Example 4 This comparative example is basically the same as Example 1, except that all the quaternized carboxyethyl chitosan in Example 1 is replaced with 120 parts of chitosan.

[0052] Comparative Example 5 This comparative example is basically the same as Example 1, except that all the quaternized carboxyethyl chitosan in Example 1 is replaced with an equal amount of nano silver.

[0053] The products of Examples 1-5 and Comparative Examples 1-5 were subjected to performance tests, including antibacterial rate, pressure absorption, and water retention ratio. The specific methods are as follows: Methods for testing antibacterial rate: (1) Prepare test pieces of uniform size and smooth surface by sterile conditions for the superabsorbent resin sample to be tested and the negative control sample.

[0054] (2) After melting the nutrient agar medium by heating, cool it to about 45°C, pour it into a sterile culture dish in a laminar flow hood, and prepare a bacterial suspension: (3) Inoculate the test strain into the nutrient broth and culture it at 37°C with shaking for about 18-24 hours to obtain the activated bacterial solution.

[0055] (4) Use a sterile pipette to draw 0.1 ml of the bacterial suspension with the adjusted concentration and drop it into the center of the agar plate. Immediately use a sterile spreader to spread the bacterial suspension evenly over the entire surface of the plate.

[0056] (5) Use sterile tweezers to place the test sample, negative control sample and positive control sample on the agar plate that has been inoculated with bacterial solution.

[0057] (6) Place the culture dish with the sample attached upright in a constant temperature incubator and incubate at 37±1°C for 18-24 hours.

[0058] (7) After the culture is completed, take out the culture dish and observe the results. Observe whether an inhibition zone appears around the negative and positive control samples respectively.

[0059] (8) Measure the width around each sample in at least four different directions and take the average value as the width of the inhibition zone of that sample. Samples with a clear inhibition zone around them have leaching antibacterial activity. The wider the inhibition zone, the stronger the diffusion and immediate antibacterial ability of the antibacterial component.

[0060] Water retention ratio testing method: (1) Weigh 0.2g of the sample, accurate to 0.0001g, and record this mass as m. Pour the entire sample into the bottom of the tea bag. (2) Seal the tea bag and soak it in a beaker containing a sufficient amount of 0.9% sodium chloride solution for 30 minutes.

[0061] (3) Centrifuge the tea bag containing the sample under a centrifugal force of 250g for 3 minutes to remove water.

[0062] (4) After dehydration, weigh the tea bag containing the sample and record the mass as m1.

[0063] (5) Use tea bags without samples to simultaneously determine the blank value, weigh the blank test tea bags and record the mass as m2.

[0064] (6) Expression of measurement results Water retention ratio calculation: In the formula: X — Water retention ratio of the sample, in grams per gram (g / g); m — Mass of the sample, in grams (g); m1——The mass of the tea bag containing the sample after dehydration, in grams (g). m2 — the mass of the tea bag in the blank test after dehydration, in grams (g).

[0065] Two measurements were performed simultaneously, and the arithmetic mean of the two measurements was taken as the result, which was then rounded to one decimal place.

[0066] 0.7psi pressure absorption test method: (1) Weigh 0.9000g of sample m1, accurate to 0.0001g, put it into a plastic cylinder, and sprinkle it evenly on the metal mesh at the bottom of the plastic cylinder.

[0067] (2) Insert the piston into the plastic cylinder containing the sample and weigh its mass m2.

[0068] (3) Place the plastic cylinder containing the sample and piston into the petri dish, add 0.9% sodium chloride solution to make the height 18 mm, and start timing.

[0069] (4) After 60 minutes, remove the plastic cylinder from the petri dish and weigh the cylinder (m3).

[0070] (5) Expression of measurement results Calculation of pressure absorption ratio: In the formula: P—the pressure absorption ratio of the sample, expressed in grams per gram (g / g). m1 — Mass of the sample, in grams (g); m2 — the mass of the sample, piston, and plastic cylinder, in grams (g); m3 — the mass of the plastic cylinder, piston, and sample after pressure absorption, expressed in grams (g).

[0071] Two measurements were performed simultaneously, and the arithmetic mean of the two measurements was taken as the result, which was then rounded to one decimal place.

[0072] The specific test results are shown in Table 1 below: Table 1 As can be seen from the data in Table 1, when the component does not contain an antibacterial agent or is replaced with another type of antibacterial agent, not only will the antibacterial effect decrease, but the pressure absorption effect and water retention ratio will also be affected. Meanwhile, the antibacterial agent of this application has an antibacterial effect comparable to that of nano-silver, but at a more advantageous price.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An antibacterial superabsorbent resin, characterized by: The preparation raw material of the antibacterial superabsorbent resin comprises, by weight fraction: 50-100 parts of antibacterial agent, 80-120 parts of acrylic acid, 100-200 parts of solution of alkaline agent, 0.5-2 parts of crosslinking agent, 600-800 parts of water, 2-5 parts of initiator, 2-5 parts of reducing agent, and 60-120 parts of post-treatment agent.

2. The antibacterial superabsorbent resin according to claim 1, characterized by: The antibacterial agent is quaternary ammonium carboxyethyl chitosan.

3. The antibacterial superabsorbent resin according to claim 1, characterized by: The mass ratio of the antibacterial agent to water is 1:(40-100).

4. The antibacterial superabsorbent resin according to claim 1, characterized by: The alkaline agent comprises any one or combination of at least two of sodium hydroxide, potassium hydroxide or sodium bicarbonate. The mass concentration of the solution of the alkaline agent is 40%-60%.

5. The antibacterial superabsorbent resin according to claim 1, characterized by: The crosslinking agent comprises any one or combination of at least two of 2-acrylamido-2-methylpropanesulfonic acid, 2,3-epoxypropyltrimethylammonium chloride, sodium methacryl sulfonate or trimethylolpropane triacrylate.

6. The antibacterial superabsorbent resin according to claim 1, characterized by: The initiator comprises any one or combination of at least two of potassium persulfate, ammonium persulfate or sodium persulfate.

7. The antibacterial superabsorbent resin according to claim 1, characterized by: The reducing agent comprises any one or combination of at least two of sodium bisulfite, sodium sulfite or sodium thiosulfate.

8. The antibacterial superabsorbent resin according to claim 1, characterized by: The post-treatment agent is a mixed solution of epichlorohydrin, glycerol and water, and the mass ratio of the epichlorohydrin, glycerol and water is 1:1:(500-1000).

9. The method of producing an antibacterial superabsorbent resin according to any one of claims 1 to 8, characterized by: The preparation method comprises: dissolving the antibacterial agent in water to obtain an antibacterial agent solution, heating to remove oxygen, then adding the acrylic acid, solution of alkaline agent, crosslinking agent, initiator and reducing agent into the antibacterial agent solution, after reaction, using the post-treatment agent for post-treatment to obtain the antibacterial superabsorbent resin.

10. The method of claim 9, wherein: The temperature of the heating to remove oxygen is 80-90℃. The time of the post-treatment is 20-40min.

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