Aromatic heterocyclic super absorbent resin and preparation method thereof

Abstract

The invention relates to heteroaromatic super absorbent resin and a preparation method thereof, and belongs to the technical field of polymer synthesis. The invention provides heteroaromatic super absorbent resin. The structural formula of the heteroaromatic super absorbent resin is shown as a formula I, the heteroaromatic ring super absorbent resin does not contain a methine structure, contains more heteroaromatic ring structures, and is good in thermal stability. # imgabs0 #

Description

Technical Field

[0001] The invention relates to an aromatic heterocyclic high water-absorbent resin and a preparation method thereof, belonging to the technical field of polymer synthesis. Background Art

[0002] Super absorbent resin (SAP) is a kind of polymer material containing a large number of hydrophilic groups and a cross-linked network structure. It can absorb water dozens to thousands times its own weight, and is not easy to lose water even when squeezed, and has excellent water retention performance. According to the source of raw materials, super absorbent resins can be divided into starch, cellulose and synthetic polymers. Synthetic polymers can be divided into polyacrylates and polyvinyl alcohols.

[0003] Starch and cellulose super absorbent resins lose their water absorption and water retention capacity due to their susceptibility to microbial decomposition, and their long-term stability is poor. Although polyacrylic acid salts and polyvinyl alcohol super absorbent resins are not affected by microbial decomposition, they are easily affected by heat and oxygen during repeated water absorption and water loss, turning yellow or causing a decrease in water absorption performance, affecting repeated use. A large number of patents report that reducing the residual monomer acrylic acid in polyacrylic acid salt super absorbent resins can improve whiteness and yellowing resistance. For example: Chinese patent CN117050228A uses the method of adding initiators in batches to increase the conversion rate of acrylic acid, thereby reducing its residue in the product. Chinese patent CN113698526A uses the addition of sulfonic acid or sulfinic acid free radical slow-release agents to regulate the polymerization rate, stabilize the reaction temperature, improve the initiation efficiency of the initiator, and reduce the residual amount of acrylic acid to about 100ppm. In addition, Chinese patent CN112724461A reports that adding a sulfinic acid component with a chelating structure can also improve the yellowing resistance of polyacrylic acid salt super absorbent resins. However, since the methyl group structure of acrylic acid is easily attacked and destroyed by free radicals at high temperatures, and monomer residue cannot be completely avoided, it is difficult to further improve the yellowing resistance of polyacrylate-based superabsorbent resins only by reducing acrylic acid residues and delaying the destruction of methyl groups by free radicals.

[0004] Therefore, it is necessary to develop a highly stable aromatic heterocyclic super absorbent resin. Summary of the invention

[0005] The purpose of the present invention is to provide an aromatic heterocyclic super absorbent resin and a preparation method thereof in view of the deficiencies of the prior art. The invention is characterized in that methacrylic anhydride, aminopyridine, aminobenzenedicarboxylic acid and diamine are used as raw materials, and reacted in water to obtain a mixed reaction liquid containing methacrylic acid, methacrylamide derivatives and methacrylamide diamide derivatives; methacrylic acid and an alkaline compound are then added, and free radical polymerization occurs under the action of an initiator, and the aromatic heterocyclic super absorbent resin is obtained after further drying. The aromatic heterocyclic super absorbent resin obtained by the present invention does not contain a methine structure and contains a large number of aromatic heterocyclic structures, and has good thermal stability. The method of the present invention has the advantages of easy raw material availability, simple operation and high yield, and the obtained resin has the advantages of fast water absorption rate, high water absorption rate and good heat resistance.

[0006] The technical solution of the present invention:

[0007] The first technical problem to be solved by the present invention is to provide an aromatic heterocyclic super absorbent resin, the structural formula of which is shown in Formula I:

[0008]

[0009] In formula I, the wavy line represents a polymer chain; x=0.050-0.332, y=0.025-0.448, z=0.500-0.923, a=0.001-0.01, x+y+z+2a=1, n=50-1000;

[0010] At least one of;

[0011] At least one of;

[0012] At least one of;

[0013] M=H and alkali metal, wherein the molar ratio of alkali metal is 0.60-0.80; the molar ratio of alkali metal is the ratio of the molar amount of alkali metal to the total molar amount of H and alkali metal.

[0014] Furthermore, the alkali metal is at least one of Na, K or Cs.

[0015] Furthermore, the aromatic heterocyclic super absorbent resin is prepared by the following method: methacrylic anhydride, aminopyridine, aminobenzenedicarboxylic acid and diamine are reacted in water to obtain a mixed solution; methacrylic acid and an alkaline compound are added to prepare a mixed reaction solution, free radical polymerization occurs under the action of an initiator, and the aromatic heterocyclic super absorbent resin is obtained after further drying.

[0016] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, the aminopyridine is at least one of p-aminopyridine, m-aminopyridine or o-aminopyridine.

[0017] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, the aminobenzene dicarboxylic acid is at least one of 5-aminoisophthalic acid, 4-aminoisophthalic acid or 2-aminoterephthalic acid.

[0018] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, the diamine is at least one of p-phenylenediamine and m-phenylenediamine.

[0019] Furthermore, the alkaline compound is at least one of sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium hydroxide, potassium carbonate, potassium bicarbonate or cesium carbonate.

[0020] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, the initiator is an oxidation-reduction initiator, comprising an oxidant and a reducing agent. The oxidant is at least one of hydrogen peroxide, ammonium persulfate, potassium persulfate or sodium persulfate. The reducing agent is at least one of sodium sulfite, sodium bisulfite, sodium thiosulfate or benzaldehyde.

[0021] The second technical problem to be solved by the present invention is to provide a method for preparing the above-mentioned aromatic heterocyclic super absorbent resin, which comprises: reacting methacrylic anhydride, aminopyridine, aminobenzenedicarboxylic acid, and diamine in water to obtain a mixed solution; adding methacrylic acid and an alkaline compound to prepare a mixed reaction solution, causing free radical polymerization under the action of an initiator, and further drying to obtain the aromatic heterocyclic super absorbent resin.

[0022] Furthermore, the structural formula of the aromatic heterocyclic super absorbent resin is:

[0023]

[0024] Wherein, the wavy line represents the polymer chain; x = 0.050-0.332, y = 0.025-0.448, z = 0.500-0.923, a = 0.001-0.01, x+y+z+2a = 1, n = 50-1000;

[0025] At least one of;

[0026] At least one of;

[0027] At least one of;

[0028] M=H or alkali metal, and the molar ratio of alkali metal is 0.60 to 0.80.

[0029] Furthermore, the alkali metal is at least one of Na, K or Cs.

[0030] Furthermore, the aromatic heterocyclic super absorbent resin is prepared by the following method: methacrylic anhydride, aminopyridine, aminobenzenedicarboxylic acid, and diamine are reacted in water to obtain a mixed solution of methacrylic acid, a methacrylamide derivative, and a methacrylamide diamide derivative; methacrylic acid and an alkaline compound are added to prepare a mixed reaction solution, free radical polymerization occurs under the action of an initiator, and the aromatic heterocyclic super absorbent resin is obtained after further drying.

[0031] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, the aminopyridine is at least one of p-aminopyridine, m-aminopyridine or o-aminopyridine.

[0032] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, the aminobenzene dicarboxylic acid is at least one of 5-aminoisophthalic acid, 4-aminoisophthalic acid or 2-aminoterephthalic acid.

[0033] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, the diamine is at least one of p-phenylenediamine and m-phenylenediamine.

[0034] Furthermore, in the preparation method of the above aromatic heterocyclic super absorbent resin, the alkaline compound is sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium hydroxide, potassium carbonate, potassium bicarbonate or cesium carbonate.

[0035] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, the initiator is an oxidation-reduction initiator, which comprises an oxidizing agent and a reducing agent.

[0036] Furthermore, the aromatic heterocyclic super absorbent resin is prepared by the following preparation steps:

[0037] (1) adding 47.0-312.1 parts of aminopyridine, 45.3-810.9 parts of aminobenzenedicarboxylic acid, 1.4-13.6 parts of diamine and 2800-5000 parts of water into a reaction kettle equipped with a thermometer, nitrogen inlet and outlet pipes, a water cooling device and a shear stirrer, introducing nitrogen and starting stirring;

[0038] (2) cooling with water, adding 118.6 to 770.0 parts of methacrylic anhydride dropwise over 0.5 to 1 hour, maintaining the temperature not exceeding 40° C.; after the addition is complete, reacting without heating for further 1 to 3 hours;

[0039] (3) adding 0 to 727.6 parts of methacrylic acid, and adding 200.0 to 1000.0 parts of a basic compound in batches over 0.5 to 1 hour, maintaining the temperature not exceeding 50° C.;

[0040] (4) Cooling to 0-35° C., adding 1.0-20.0 parts of an oxidant and 1.0-15.0 parts of a reducing agent in sequence, stirring until completely dissolved; heating to 60-100° C. within 0.5-1 hour, stopping nitrogen flow, stopping stirring, and keeping warm for reaction for 2-6 hours;

[0041] (5) Cooling, turning on the shear mixer to cut the material into gel particles, releasing the material, and drying to obtain the aromatic heterocyclic super absorbent resin.

[0042] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, in step (4), the oxidant is at least one of hydrogen peroxide, ammonium persulfate, potassium persulfate or sodium persulfate.

[0043] Furthermore, in the method for preparing the above aromatic heterocyclic super absorbent resin, in step (4), the reducing agent is at least one of sodium sulfite, sodium bisulfite, sodium thiosulfate or benzaldehyde.

[0044] In the present invention, the parts of raw materials are all parts by weight unless otherwise specified.

[0045] Beneficial effects of the present invention:

[0046] 1. The aromatic heterocyclic super absorbent resin prepared by the present invention does not contain methine in its structure, is not easily damaged by free radicals, and has the advantage of good yellowing resistance.

[0047] 2. The aromatic heterocyclic super absorbent resin prepared by the present invention contains rigid aromatic heterocyclic rings in its structure, and is mostly conjugated with nitrogen atoms or carboxyl groups, has a stable chemical structure, and has the advantages of high thermal decomposition temperature and high glass transition temperature.

[0048] 3. The present invention uses hydrophilic aminopyridine and aminobenzenedicarboxylic acid as the source of aromatic heterocycles, which still have strong hydrophilicity after copolymerization. The obtained aromatic heterocycle super absorbent resin has the advantage of high water absorption rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is the infrared spectrum of the aromatic heterocyclic super absorbent resin obtained in Example 1. DETAILED DESCRIPTION

[0050] The present invention provides an aromatic heterocyclic super absorbent resin and a preparation method thereof, which is characterized in that methacrylic anhydride, aminopyridine, aminobenzenedicarboxylic acid and diamine are used as raw materials, reacted in water to obtain a mixed reaction liquid containing methacrylic acid, methacrylamide derivatives and methacrylamide diamide derivatives; methacrylic acid and an alkaline compound are then added, free radical polymerization occurs under the action of an initiator, and the aromatic heterocyclic super absorbent resin is obtained after further drying. The aromatic heterocyclic super absorbent resin obtained by the present invention does not contain a methine structure and contains a relatively large number of aromatic heterocyclic structures, and has good thermal stability.

[0051] The present invention is described in detail below through examples. It is necessary to point out that the examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments based on the contents of the present invention.

[0052] Example 1

[0053] 94.0 g of p-aminopyridine, 181.0 g 5-aminoisophthalic acid, 2.7g m-phenylenediamine and 3300g water are added to a reactor equipped with a thermometer, a nitrogen inlet and outlet pipe, a water cooling device and a shearing stirrer, nitrogen is introduced, and stirring is started; water cooling is performed, and 314.2g methacrylic anhydride is added dropwise within 0.5 hour, maintaining the temperature not exceeding 40°C; after the dropwise addition is completed, the temperature of the reaction system is maintained and the reaction is continued for 2 hours; 509.1g methacrylic acid is added, and 300.0g sodium hydroxide is added to the reactor in batches within 1 hour, maintaining the temperature not exceeding 50°C; the temperature is lowered to 25°C, 4.0g ammonium persulfate and 2.0g sodium sulfite are added in sequence, and stirred until completely dissolved; the temperature is raised to 75°C within 1 hour, the nitrogen is stopped, the stirring is stopped, and the reaction is kept warm for 4 hours; the temperature is lowered, the shearing stirrer is turned on to cut the material into gel particles, the material is discharged, and it is dried at 150°C to a water content of ≤0.2%, and an aromatic heterocyclic super absorbent resin is obtained, and the pure water absorption rate is: 282. The performance parameters of each embodiment are shown in Table 1.

[0054] Performance test: Infrared spectrum analysis uses Nicolet 670 infrared spectrometer, with the dried flakes of the product as samples, measuring the reflection mode, and the test wave number range: 4000~400cm -1 . Figure 1 The infrared spectrum of the aromatic heterocyclic super absorbent resin obtained in Example 1 is shown in FIG. Figure 1 It can be seen that 2980cm -1 、2926cm -1 、1401cm -1 and 1363cm -1 Methyl and methylene absorption peaks, 1655 cm -1 is the carboxyl absorption peak, 1553 cm -1 Carboxylate ion absorption peak, 836 cm -1 and 715cm -1 The absorption peak of 1,3,5-trisubstituted benzene ring is 778cm -1 It is the absorption peak of para-substituted pyridine ring.

[0055] Water absorption test: Take 3 portions of about 0.3g of aromatic heterocyclic super absorbent resin, add about 200g of pure water, physiological saline (0.9% sodium chloride solution) and seawater (density 1.023g / cm 3) and soaked for 12 hours; filtered with a 100-mesh filter, and the ratio of the increased weight of the resin to the original weight is the corresponding water absorption rate. As shown in Table 1, the water absorption rates of the aromatic heterocyclic super absorbent resin obtained in Example 1 in pure water, physiological saline and seawater are 282, 57 and 28, respectively.

[0056] Example 2

[0057] 312.1 g of m-aminopyridine, 200.0 g of 5-aminoisophthalic acid, 100.5 g 4-aminoisophthalic acid, 1.4g of meta-phenylenediamine and 4200g of water were added to a reactor equipped with a thermometer, a nitrogen inlet and outlet pipe, a water cooling device and a shearing stirrer, nitrogen was introduced, and stirring was started; water cooling was performed, and 770.0g of methacrylic anhydride was added dropwise within 1 hour, maintaining the temperature not exceeding 40°C; after the dropwise addition was completed, the temperature of the reaction system was maintained and the reaction continued for 3 hours; 353.6g of sodium carbonate was added to the reactor in batches within 0.5 hour, maintaining the temperature not exceeding 50°C; the temperature was lowered to 0°C, 16.0g of potassium persulfate and 9.0g of sodium bisulfite were added in sequence, and stirred until completely dissolved; the temperature was raised to 60°C within 0.5 hour, the nitrogen was stopped, the stirring was stopped, and the reaction was kept warm for 6 hours; the temperature was lowered, the shearing stirrer was turned on to cut the material into gel particles, the material was discharged, and it was dried at 150°C to a water content of ≤0.2%, and an aromatic heterocyclic super absorbent resin was obtained, and its water absorption results are shown in Table 1.

[0058] Example 3

[0059] 47.0g of o-aminopyridine, 45.3g of 2-aminoterephthalic acid, 1.4g of p-phenylenediamine and 2800g of water were added to a reactor equipped with a thermometer, a nitrogen inlet and outlet pipe, a water cooling device and a shear stirrer, nitrogen was introduced, and stirring was started; water cooling was passed, and 118.6g of methacrylic anhydride was added dropwise within 0.5 hours, maintaining the temperature not exceeding 40°C; after the addition was completed, the temperature of the reaction system was maintained and the reaction was continued for 1 hour; 727.6g of methacrylic acid was added, and 294.8g of sodium bicarbonate and 234.0g of potassium bicarbonate were added to the reactor in batches within 0.5 hours, maintaining the temperature not exceeding 50°C; the temperature was lowered to 35°C, and 3.3g of 30% aqueous hydrogen peroxide solution and 3.5g sodium thiosulfate were stirred until completely dissolved; the temperature was raised to 100°C within 1 hour, the nitrogen was stopped, the stirring was stopped, and the reaction was kept warm for 2 hours; the temperature was lowered, and the shear stirrer was turned on to cut the material into gel particles, the material was released, and dried at 150°C to a water content of ≤0.2% to obtain an aromatic heterocyclic super absorbent resin, and the water absorption results are shown in Table 1.

[0060] Example 4

[0061] 27.0 g of p-aminopyridine, 20.0 g of m-aminopyridine, 810.9 g of 5-aminoisophthalic acid, 1.4 g of p-phenylenediamine and 5000 g of water were added to a reactor equipped with a thermometer, a nitrogen inlet and outlet pipe, a water cooling device and a shear stirrer, nitrogen was introduced, and stirring was started; water cooling was passed, and 770.0 g of methacrylic anhydride was added dropwise within 1 hour, maintaining the temperature not exceeding 40°C; after the addition was completed, the temperature of the reaction system was maintained and the reaction was continued for 3 hours; 548.0 g of potassium hydroxide was added to the reactor in batches within 1 hour, maintaining the temperature not exceeding 50°C; the temperature was lowered to 30°C, and 3.3 g of 30% aqueous hydrogen peroxide solution and 3.0g sodium bisulfite were stirred until completely dissolved; the temperature was raised to 85°C within 1 hour, the nitrogen was stopped, the stirring was stopped, and the reaction was kept warm for 3 hours; the temperature was lowered, and the shear stirrer was turned on to cut the material into gel particles, the material was discharged, and dried at 150°C to a water content of ≤0.2% to obtain an aromatic heterocyclic super absorbent resin, and the water absorption results are shown in Table 1.

[0062] Example 5

[0063] 141.0g of p-aminopyridine, 407.3g of 2-aminoterephthalic acid, 6.8g of p-phenylenediamine, 6.8g of m-phenylenediamine and 4100g of water were added to a reactor equipped with a thermometer, nitrogen inlet and outlet pipes, a water cooling device and a shear stirrer, nitrogen was introduced, and stirring was started; water cooling was passed, and 608.3g of methacrylic anhydride was added dropwise within 0.5 hour, maintaining the temperature not exceeding 40°C; after the addition was completed, the reaction system temperature was maintained and the reaction was continued for 3 hours; 180.6g of methacrylic acid was added, and 433. 9 g of potassium carbonate and 113.8 g of cesium carbonate were added to the reaction kettle, and the temperature was maintained at no more than 50° C.; the temperature was lowered to 15° C., and 7.0 g of sodium ammonium persulfate and 4.0 g of benzaldehyde were added in sequence, and stirred until completely dissolved; the temperature was raised to 95° C. within 1 hour, the nitrogen was stopped, the stirring was stopped, and the reaction was kept warm for 2 hours; the temperature was lowered, and the shear stirrer was turned on to cut the material into gel particles, the material was discharged, and it was dried at 150° C. to a water content of ≤0.2%, to obtain an aromatic heterocyclic super absorbent resin, and its water absorption results are shown in Table 1.

[0064] Example 6

[0065] 0.94kg of p-aminopyridine, 1.81kg 5-aminoisophthalic acid, 41g of meta-phenylenediamine and 33kg of water were added to a reactor equipped with a thermometer, a nitrogen inlet and outlet pipe, a water cooling device and a shearing stirrer, nitrogen was introduced, and stirring was started; water was passed for cooling, and 3.17kg of methacrylic anhydride was added dropwise within 1 hour, maintaining the temperature not exceeding 40°C; after the dropwise addition was completed, the temperature of the reaction system was maintained and the reaction continued for 3 hours; 5.06kg of methacrylic acid was added, and 2.80kg of sodium hydroxide was added to the reactor in batches within 1 hour, maintaining the temperature not exceeding 50°C; the temperature was lowered to 30°C, 55g of potassium persulfate and 23g of sodium sulfite were added in sequence, and stirred until completely dissolved; the temperature was raised to 80°C within 1 hour, the nitrogen was stopped, the stirring was stopped, and the reaction was kept warm for 4 hours; the temperature was lowered, the shearing stirrer was turned on to cut the material into gel particles, the material was discharged, and it was dried at 150°C to a water content of ≤0.2%, and an aromatic heterocyclic super absorbent resin was obtained, and its water absorption results are shown in Table 1.

[0066] Table 1 Performance parameters of aromatic heterocyclic super absorbent resins obtained in Examples 1 to 6

[0067] Pure water absorption Water absorption rate of saline solution Seawater absorption Example 1 282 57 28 Example 2 271 53 26 Example 3 295 59 33 Example 4 317 67 37 Example 5 266 51 29 Example 6 305 73 43

Claims

1. An aromatic heterocyclic super absorbent resin, characterized in that: Its structural formula is shown in Formula I: In formula I, the wavy line represents a polymer chain; x=0.050-0.332, y=0.025-0.448, z=0.500-0.923, a=0.001-0.01, x+y+z+2a=1, n=50-1000; At least one of; At least one of; At least one of; M=H and alkali metal, wherein the molar ratio of alkali metal is 0.60-0.

80.

2. The aromatic heterocyclic super absorbent resin according to claim 1, characterized in that: The alkali metal is at least one of Na, K or Cs.

3. An aromatic heterocyclic super absorbent resin according to claim 1 or 2, characterized in that: The aromatic heterocyclic super absorbent resin is prepared by the following preparation method: methacrylic anhydride, aminopyridine, aminobenzenedicarboxylic acid and diamine are reacted in water to obtain a mixed solution; methacrylic acid and an alkaline compound are added to prepare a mixed reaction solution, and then free radical polymerization is carried out under the action of an initiator, and finally drying is carried out to obtain the aromatic heterocyclic super absorbent resin.

4. The aromatic heterocyclic super absorbent resin according to claim 3, characterized in that: The aminopyridine is at least one of p-aminopyridine, m-aminopyridine or o-aminopyridine; or: The aminobenzenedicarboxylic acid is at least one of 5-aminoisophthalic acid, 4-aminoisophthalic acid or 2-aminoterephthalic acid; or: The diamine is at least one of p-phenylenediamine or m-phenylenediamine; or: The alkaline compound is at least one of sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium hydroxide, potassium carbonate, potassium bicarbonate or cesium carbonate; or: The initiator is a redox initiator, comprising an oxidizing agent and a reducing agent.

5. The method for preparing an aromatic heterocyclic super absorbent resin according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: reacting methacrylic anhydride, aminopyridine, aminobenzenedicarboxylic acid and diamine in water to obtain a mixed solution; then adding methacrylic acid and an alkaline compound to prepare a mixed reaction solution; then free radical polymerization occurs under the action of an initiator; and finally drying to obtain an aromatic heterocyclic super absorbent resin.

6. The method for preparing an aromatic heterocyclic super absorbent resin according to claim 5, characterized in that: The aminopyridine is at least one of p-aminopyridine, m-aminopyridine or o-aminopyridine; or: The aminobenzene dicarboxylic acid is at least one of 5-aminoisophthalic acid, 4-aminoisophthalic acid or 2-aminoterephthalic acid; or: The diamine is at least one of p-phenylenediamine and m-phenylenediamine.

7. The method for preparing an aromatic heterocyclic super absorbent resin according to claim 5 or 6, characterized in that: The alkaline compound is at least one of sodium hydroxide, sodium carbonate, sodium bicarbonate, potassium hydroxide, potassium carbonate, potassium bicarbonate or cesium carbonate; or: The initiator is a redox initiator, comprising an oxidizing agent and a reducing agent.

8. The method for preparing an aromatic heterocyclic super absorbent resin according to claim 7, characterized in that: The oxidant is at least one of hydrogen peroxide, ammonium persulfate, potassium persulfate or sodium persulfate; The reducing agent is at least one of sodium sulfite, sodium bisulfite, sodium thiosulfate or benzaldehyde.

9. The method for preparing an aromatic heterocyclic super absorbent resin according to claim 5, characterized in that: The aromatic heterocyclic super absorbent resin is prepared by the following preparation steps: (1) adding 47.0-312.1 parts by weight of aminopyridine, 45.3-810.9 parts by weight of aminobenzenedicarboxylic acid, 1.4-13.6 parts by weight of diamine and 2800-5000 parts by weight of water into a reaction kettle equipped with a thermometer, nitrogen inlet and outlet pipes, a water cooling device and a shear stirrer, introducing nitrogen and starting stirring; (2) cooling with water, adding 118.6 to 770.0 parts by weight of methacrylic anhydride dropwise over 0.5 to 1 hour, maintaining the temperature at no more than 40° C.; after the addition is complete, maintaining the temperature of the reaction system for further reaction for 1 to 3 hours; (3) adding 0 to 727.6 parts by weight of methacrylic acid, and adding 200.0 to 1000.0 parts by weight of a basic compound in batches over 0.5 to 1 hour, while maintaining the temperature at no more than 50° C.; (4) cooling to 0-35° C., adding 1.0-20.0 parts by weight of an oxidant and 1.0-15.0 parts by weight of a reducing agent in sequence, and stirring until completely dissolved; heating to 60-100° C. within 0.5-1 hour, stopping nitrogen flow, stopping stirring, and keeping warm for reaction for 2-6 hours; (5) Cooling, turning on the shear mixer to cut the material into gel particles, releasing the material, and drying to obtain the aromatic heterocyclic super absorbent resin.

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