CN114369322A - Preparation method of high-molecular water-absorbent resin - Google Patents
Preparation method of high-molecular water-absorbent resin Download PDFInfo
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- CN114369322A CN114369322A CN202210056318.6A CN202210056318A CN114369322A CN 114369322 A CN114369322 A CN 114369322A CN 202210056318 A CN202210056318 A CN 202210056318A CN 114369322 A CN114369322 A CN 114369322A
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- 229920005989 resin Polymers 0.000 title claims abstract description 52
- 239000011347 resin Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000002250 absorbent Substances 0.000 title claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 15
- 108010020346 Polyglutamic Acid Proteins 0.000 claims abstract description 15
- 229920002643 polyglutamic acid Polymers 0.000 claims abstract description 15
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 10
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 8
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 7
- 239000012065 filter cake Substances 0.000 claims description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 9
- 239000003999 initiator Substances 0.000 claims description 9
- LXEKPEMOWBOYRF-QDBORUFSSA-N AAPH Chemical group Cl.Cl.NC(=N)C(C)(C)\N=N\C(C)(C)C(N)=N LXEKPEMOWBOYRF-QDBORUFSSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 229920003002 synthetic resin Polymers 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 230000002745 absorbent Effects 0.000 claims description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 2
- OZAIFHULBGXAKX-VAWYXSNFSA-N AIBN Substances N#CC(C)(C)\N=N\C(C)(C)C#N OZAIFHULBGXAKX-VAWYXSNFSA-N 0.000 claims description 2
- 239000002952 polymeric resin Substances 0.000 claims 6
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical group ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims 2
- 239000008213 purified water Substances 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 4
- 238000004132 cross linking Methods 0.000 abstract description 4
- 238000006116 polymerization reaction Methods 0.000 abstract description 4
- 239000000178 monomer Substances 0.000 abstract description 2
- 231100000252 nontoxic Toxicity 0.000 abstract description 2
- 230000003000 nontoxic effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000012295 chemical reaction liquid Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical group CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 description 5
- 229920002678 cellulose Polymers 0.000 description 5
- 235000010980 cellulose Nutrition 0.000 description 5
- 239000001913 cellulose Substances 0.000 description 4
- 235000019441 ethanol Nutrition 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920002472 Starch Polymers 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 235000019698 starch Nutrition 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 235000013922 glutamic acid Nutrition 0.000 description 1
- 239000004220 glutamic acid Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/246—Intercrosslinking of at least two polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/04—Acids; Metal salts or ammonium salts thereof
- C08F120/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2477/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
- C08K5/1515—Three-membered rings
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to a preparation method of high-molecular water-absorbing resin, belonging to the technical field of high-molecular materials. The invention takes acrylic acid as a polymerization monomer, prepares polyacrylic acid through polymerization reaction, then generates crosslinking reaction with polyglutamic acid under the action of a crosslinking agent to generate gel with a net structure, and finally obtains the high-molecular water-absorbing resin through post treatment. The high-molecular water-absorbing resin prepared by the invention has the advantages of good water absorption, high gel strength after water absorption, capability of being degraded into non-toxic and harmless micromolecules and the like.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a preparation method of high polymer water-absorbent resin.
Background
The high-molecular water-absorbent resin is a typical functional high-molecular material, contains a large number of strong hydrophilic groups such as amino groups, carboxyl groups and hydroxyl groups and a unique three-dimensional network structure, can absorb water which is hundreds times or thousands times heavier than the self-mass of the high-molecular water-absorbent resin, has strong water retention capacity, and can bear certain extrusion, thereby attracting the attention of a plurality of researchers and becoming a research hotspot of the functional high-molecular material.
The macromolecular water-absorbing resin mainly comprises three main types: starches, celluloses, and synthetic resins. The starch water-absorbing resin has the advantages of easily obtained raw materials, high water absorption rate and the like, but has low gel strength, needs to be gelatinized for starch in the preparation process, and has a complex process. The cellulose water-absorbing resin has the advantages of easily obtained raw materials, flat structure, large specific surface area and the like. However, in the cellulose-based water-absorbent resin, hydrogen bonds may be formed between cellulose and water molecules. The presence of hydrogen bonds has a greater impact on the reactivity of the cellulose, not only affecting its rate of water uptake, but also making it unable to absorb as much water as polyacrylic acids. The synthetic resin water-absorbent resin mainly takes polyacrylic acids, polyethylene glycols and polyvinyl alcohols as main materials, is different from starch-type and cellulose-type water-absorbent resins, and has a large number of hydrophilic groups and a network structure formed by crosslinking on molecular chains, so that the material can absorb water rapidly and store the water in the network structure. However, the synthetic water-absorbent resin has small gel strength after water absorption and poor biodegradability, and is easy to cause environmental pollution after being discarded, thereby greatly limiting the application range of the water-absorbent material. In addition, when the water-absorbing resin is prepared, water-soluble impurities can enter the resin along with water due to water absorption, and are not easy to remove during post-treatment, so that the obtained product has high impurity content. In addition, when the water-absorbing resin is prepared, water-soluble impurities can enter the resin along with water due to water absorption, and are not easy to remove during post-treatment, so that the obtained product has high impurity content.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a preparation method of a high-molecular water-absorbent resin, which aims to solve the technical problems.
The technical scheme of the invention is as follows:
a process for preparing the high-molecular water-absorbent resin includes such steps as polymerizing acrylic acid to obtain polyacrylic acid, cross-linking reaction with polyglutamic acid under the action of cross-linking agent to obtain gel with netted structure, and post-treating.
The method comprises the following specific steps:
(1) adding acrylic acid into water, controlling the temperature, adding sodium hydroxide, adjusting the pH value of the reaction solution to 11-12, then adding part of initiator, heating for reaction for 2-3 h, adding the rest of initiator, and continuously preserving the heat for 1-2 h to obtain a polyacrylic acid reaction solution;
(2) adding polyglutamic acid into the reaction solution prepared in the step (1), uniformly stirring, adding a cross-linking agent, controlling the temperature, reacting for 2-3 hours, and gradually generating a gel substance in the reaction process;
(3) after the reaction is finished, cooling the reaction solution to room temperature, and filtering to obtain a filter cake I; washing the filter cake I with water until the pH value of the filtrate is 7-8; and then soaking and stirring the filter cake I by using absolute ethyl alcohol I, filtering and drying to obtain the high-molecular water-absorbent resin.
The reason for adopting the post-treatment method is that water in the resin can be replaced by soaking the resin after water absorption and swelling by using absolute ethyl alcohol; at the moment, the gel shrinks, and a large amount of water-soluble impurities in the resin can be transferred into ethanol along with water, so that the gel internal impurities can be removed. Meanwhile, because the resin contains a large amount of moisture, the drying time is very long by adopting a common drying process, most of the moisture in the resin is removed after the moisture in the resin is replaced by ethanol, and a small amount of moisture and ethanol are subjected to azeotropic overflow during high-temperature drying, so that the drying time is greatly shortened. The washed ethanol can be reused after water outlet operation.
Preferably, the initiator is selected from AAPH or AIBN, and the use amount of the initiator is 5-8% of the use amount of acrylic acid.
Preferably, the first adding amount of the initiator is 1/2-2/3 of the total amount.
Preferably, the average molecular weight of the polyglutamic acid is 70-100 KDa, and the dosage of the polyglutamic acid is 0.1-0.3 g/g based on the dosage of acrylic acid.
Preferably, the crosslinking agent is epoxy chloropropane, and the amount of the epoxy chloropropane is 0.01-0.02 g/g based on the amount of the acrylic acid.
Preferably, in the step (1), the reaction temperature is 70-80 ℃.
Preferably, in the step (2), the reaction temperature is 50-60 ℃.
Preferably, in the step (3), the amount of the absolute ethyl alcohol I is 2-3 ml/g based on the weight of the filter cake I.
The invention has the beneficial effects that:
the high molecular water-absorbing resin prepared by the invention adopts acrylic acid as a polymerization matrix, long-chain polyacrylic acid is obtained through polymerization reaction, polyglutamic acid used in crosslinking also has a chain structure, and the two are crosslinked through the action of a crosslinking agent to form a dense spatial network structure. After the absorbed water enters the net-shaped structure, hydrogen bonds are formed between the absorbed water and the net-shaped molecules, the evaporation loss is slow, the gel strength of the water-absorbent resin is high, the impact resistance is strong, the absorbed water is not easy to extrude out, and the water retention performance is good. The polyglutamic acid has a large number of hydrophilic groups in molecules, so that the water absorption property of the resin is improved. Because a large number of peptide bonds exist on the main chain of the polyglutamic acid, the polyglutamic acid is easily subjected to the action of light and heat in the environment, and is degraded into nontoxic short peptide or glutamic acid monomer, so that the use is safe and environment-friendly.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of high-molecular water-absorbent resin comprises the following specific preparation steps:
(1) adding 100g of acrylic acid into 1000ml of water, reducing the temperature of a reaction system to 0-10 ℃, adding sodium hydroxide at controlled temperature, adjusting the pH of a reaction solution to 11-12, adding 58g of the reaction solution, adding 2.5g of AAPH, replacing 3 times with nitrogen, heating to 70 ℃, and reacting for 2.5 hours; then adding the rest 2.5g of AAPH, and keeping the temperature for 1h to obtain polyacrylic acid reaction liquid;
(2) cooling the reaction liquid prepared in the step (1) to 50 ℃, adding 20g of polyglutamic acid (average molecular weight is 70KDa), uniformly stirring, adding 1.0g of epoxy chloropropane, reacting for 2 hours at a controlled temperature, and gradually generating a gel substance in the reaction process;
(3) after the reaction is finished, cooling the reaction solution to room temperature, and filtering to obtain a filter cake I; washing the filter cake I with water until the pH value of the filtrate is 7-8, and weighing 5.8kg of the filter cake I; and then adding 6L of absolute ethyl alcohol to soak and stir the filter cake I, filtering and drying to obtain 97g of white-like high polymer water-absorbent resin.
Example 2
A preparation method of high-molecular water-absorbent resin comprises the following specific preparation steps:
(1) adding 500g of acrylic acid into 5L of water, reducing the temperature of a reaction system to 0-10 ℃, adding sodium hydroxide at controlled temperature, adjusting the pH of a reaction solution to 11-12, adding 291g of acrylic acid, adding 15g of AAPH, replacing 3 times with nitrogen, and heating to 70 ℃ for reaction for 3 hours; then adding the rest 15g of AAPH, and keeping the temperature for 1h to obtain polyacrylic acid reaction liquid;
(2) cooling the reaction liquid prepared in the step (1) to 50 ℃, adding 100g of polyglutamic acid (with the average molecular weight of 90KDa), uniformly stirring, adding 7.0g of epoxy chloropropane, reacting for 2 hours at a controlled temperature, and gradually generating a gel substance in the reaction process;
(3) after the reaction is finished, cooling the reaction solution to room temperature, and filtering to obtain a filter cake I; washing the filter cake I with water until the pH value of the filtrate is 7-8, and weighing 2.55kg of the filter cake I; and then, adding 2.6L of absolute ethyl alcohol to soak and stir the filter cake I, filtering and drying to obtain 510g of light yellow macromolecular water-absorbing resin.
Example 3
A preparation method of high-molecular water-absorbent resin comprises the following specific preparation steps:
(1) adding 2.0kg of acrylic acid into 20L of water, reducing the temperature of a reaction system to 0-10 ℃, adding sodium hydroxide at controlled temperature, adjusting the pH of a reaction solution to 11-12, adding 1.2kg of the reaction solution, adding 100g of AAPH, replacing 3 times with nitrogen, heating to 70 ℃ and reacting for 3 hours; then adding the rest 60g of AAPH, and keeping the temperature for 2 hours to obtain polyacrylic acid reaction liquid;
(2) cooling the reaction liquid prepared in the step (1) to 50 ℃, adding 0.6kg of polyglutamic acid (average molecular weight 100KDa), uniformly stirring, adding 40g of epoxy chloropropane, reacting for 3 hours at a controlled temperature, and gradually generating a gel substance in the reaction process;
(3) after the reaction is finished, cooling the reaction solution to room temperature, and filtering to obtain a filter cake I; washing the filter cake I with water until the pH value of the filtrate is 7-8, and weighing 11.1kg of the filter cake I; and then adding 15L of absolute ethyl alcohol to soak and stir the filter cake I, filtering and drying to obtain 2.2kg of off-white macromolecular water-absorbing resin.
Test example
The resin prepared in the embodiment 1-3 is subjected to relevant detection, and the specific detection method comprises the following steps:
the method for testing the water absorption rate of the resin comprises the following steps: a0.25 g sample is taken and added into a beaker filled with 500mL deionized water, the mixture is kept stand for 24 hours at room temperature, and the resin after water absorption is filtered by a 100-mesh standard sieve until no water drops. The mass of the absorbent gel was weighed and the water absorption was calculated as follows: resin water absorption (g/g) — (mass of resin after liquid absorption (g) -mass of resin before liquid absorption (g))/(mass of resin before liquid absorption (g).
The resin gel strength test method comprises the following steps: the size of the resin after water absorption is about 40mm multiplied by 40mm, the drill bit of the physical property analyzer is selected to be P0.5 during the measurement, the measurement conditions are that the speed before the test is 2mm/s, the pressing speed during the test is 0.5mm/s, the returning speed after the test is 2mm/s, the depth of the compressed sample is 4mm, and the g/cm is measured2The gel strength at this time was recorded in units.
The test results are shown in Table 1 below
| Test item | Example 1 | Example 2 | Example 3 |
| Water absorption Rate (g/g) | 58.4 | 59.2 | 59.6 |
| Gel Strength (g/cm) of the resin2) | 154 | 166 | 174 |
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A preparation method of high-molecular water-absorbent resin is characterized by comprising the following specific steps:
(1) adding acrylic acid into water, controlling the temperature, adding sodium hydroxide, adjusting the pH value of the reaction solution to 11-12, then adding an initiator, heating for reaction for 2-3 h, then adding the initiator, and continuing to keep the temperature for 1-2 h to obtain a polyacrylic acid reaction solution;
(2) adding polyglutamic acid into the reaction solution prepared in the step (1), uniformly stirring, adding a cross-linking agent, and controlling the temperature to react for 2-3 hours;
(3) after the reaction is finished, cooling the reaction solution to room temperature, and filtering to obtain a filter cake I; washing the filter cake I with water until the pH value of the filtrate is 7-8; then, soaking and stirring the filter cake I by using absolute ethyl alcohol I, and filtering to obtain a filter cake II; then soaking and washing the filter cake II by using purified water, soaking and stirring the filtered filter cake by using absolute ethyl alcohol II once, and filtering; drying to obtain the high molecular water-absorbing resin.
2. The method for preparing a water absorbent polymer resin according to claim 1, wherein said initiator is selected from AAPH and AIBN.
3. The method for preparing a water-absorbent polymer resin according to claim 1, wherein the amount of the initiator is 5 to 8% based on the amount of acrylic acid.
4. The method for preparing a water-absorbent polymer resin according to claim 1, wherein the polyglutamic acid has an average molecular weight of 70kDa to 100 kDa.
5. The method for preparing a water-absorbent polymer resin according to claim 1, wherein the amount of the polyglutamic acid is 0.1 to 0.3g/g based on the amount of acrylic acid.
6. The method for preparing a water-absorbent polymer resin according to claim 1, wherein said crosslinking agent is epichlorohydrin.
7. The method for preparing a high molecular water absorbent resin according to claim 1, wherein the amount of epichlorohydrin is 0.1 to 0.2g/g based on the amount of acrylic acid.
8. The method for preparing a high molecular water-absorbent resin according to claim 1, wherein in the step (1), the reaction temperature is 70 to 80 ℃.
9. The method for preparing a water-absorbent polymer resin according to claim 1, wherein in the step (2), the reaction temperature is 50 to 60 ℃.
10. The method for preparing a high molecular water-absorbing resin according to claim 1, wherein in the step (3), the amount of the absolute ethyl alcohol I is 1 to 2ml/g based on the weight of the filter cake I.
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