CN104829788A - Preparation method for chitosan/2-acrylamido-2-methyl AMPS hydrogel - Google Patents

Preparation method for chitosan/2-acrylamido-2-methyl AMPS hydrogel Download PDF

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CN104829788A
CN104829788A CN201510182136.3A CN201510182136A CN104829788A CN 104829788 A CN104829788 A CN 104829788A CN 201510182136 A CN201510182136 A CN 201510182136A CN 104829788 A CN104829788 A CN 104829788A
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chitosan
amps
acrylamide
hydrogel
methylpro panesulfonic
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CN104829788B (en
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陆泉芳
徐海娟
王亮亮
马全福
俞洁
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Northwest Normal University
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Abstract

The present invention discloses a novel preparation method for chitosan/2-acrylamido-2-methyl AMPS hydrogel (CS/AMPS), wherein chitosan and 2-acrylamido-2-methyl AMPS are adopted as raw materials, and N, N'-methylene bis acrylamide (MBA) is adopted as a cross-linking agent. The cross-linking reaction directly occurs between the raw materials and the cross-linking agent in an aqueous solution system to generate the hydrogel. Compared with the conventional method, the above preparation process is simple, green, environment-friendly and low in cost. The synthesized CS/AMPS hydrogel as an adsorbing material is uniform in structure, higher in adsorption quantity, faster in adsorption rate, good in adsorbability of cationic dyes, and excellent in performance. The hydrogel is wide in application prospect in the fields of dyes and heavy-metal-ion wastewater purification.

Description

The preparation method of chitosan/2-acrylamide-2-methylpro panesulfonic acid hydrogel
Technical field
The present invention relates to the novel method that one prepares chitosan/2-acrylamide-2-methylpro panesulfonic acid (CS/AMPS) hydrogel, belong to functional high polymer material field.
Background technology
Chitosan (Chitosan, CS) is the deacetylated product of part of chitin, is be only second to cellulosic second largest multi-polysaccharide natural macromolecule compound.The good biocompatibility of chitosan, and can be biodegradable, degraded product nontoxicity; Chitosan-phospholipid complex also has unique character such as sequestering of antiviral property, microbial resistance, heavy metal ion.They are expected to obtain application in drug release, heavy metal recovery, sewage disposal, membrane sepn, daily-use chemical industry etc.But the free amine group in chitosan molecule can accept proton salify, can dissolve in an acidic solution, cause loss, seriously limit its application.Therefore, improving acid resistance is one of focus of current chitin modified research.Hydroxyl abundant on chitosan molecule chain and amino make it be easy to carry out chemically modified; as through the modified introducing stimuli responsive polymers of acidylate, carboxylation and hydroxylation or small molecules; give the stuctures and properties that chitosan is new; become by natural polysaccharide and the molecular intelligent macromolecule hydrogel with three-dimensional net structure of synthesis high score; greatly improve the water-soluble of chitosan and moisture retention, and change the liberation characteristic of chitosan molecule side-chain radical in different pH value.Accordingly, chitosan-based hydrogel material is expected to have certain using value in health care, agricultural gardening, sewage purification, biomaterial etc.
Up to now, the main preparation methods of chitosan-based hydrogel has chemistry initiation method, radiation causes method and light-initiated method, has recently also occurred some reports caused about microwave.In general, chemically prepare in the process of chitosan-based hydrogel and need N 2protection, and add a small amount of initiator, produce secondary pollution.And physics initiation also needs N 2protection, though non-secondary pollution, the hydrogel structure produced is uneven.
2-acrylamide-2-methylpro panesulfonic acid (AMPS) is a kind of anionic vinyl base monomer containing wetting ability sulfonate functional group and non-ionic type amide group, sulfonic group makes it have ion exchangeable, and active carbon-carbon double bond makes it easily be polymerized, addition reaction.Generally speaking; CS/AMPS hydrogel can adopt chemistry initiation, radiation initiation, uv-light polymerization also crosslinked by chitosan (CS) and 2-acrylamide-2-methylpro panesulfonic acid (AMPS) and obtain in acetum under nitrogen protection; but step is various; produce secondary pollution, performance is not good.
Summary of the invention
The object of the invention is for synthesizing the defects such as CS/AMPS condition harshness, poor performance in prior art, a kind of novel method of convenient, fast synthesis CS/AMPS hydrogel is provided.
The novel preparation method of CS/AMPS hydrogel of the present invention, be raw material with chitosan (CS) and 2-acrylamide-2-methylpro panesulfonic acid (AMPS), N, N'-methylene-bisacrylamide (MBA) is linking agent, in aqueous, stir a step under certain temperature and obtain chitosan/2-acrylamide-2-methylpro panesulfonic acid (CS/AMPS) hydrogel.
Concrete preparation technology is: the water adding 0.2 ~ 0.6 g CS and 20 ~ 70 times in 250 mL there-necked flasks, 5-30 min is stirred with 90 ~ 120 r/min at 30 ~ 90 DEG C, then AMPS and the 0.02-0.16 times of linking agent MBA of 6 ~ 20 times is added, continue stirring 20 min, there is oyster white in solution, continues to stir 30 ~ 180 min at 60 ~ 80 DEG C, and cooled product is to room temperature, obtain white g., jelly-like product, take out.Product is cut the fragment for diameter about 2 ~ 5 mm, degree of neutralization is made to reach 40% ~ 90% with 1 mol/L NaOH neutralization again, again by product distilled water wash for several times to remove unreacted monomer, absolute ethanol washing for several times, 40 ~ 70 DEG C of dryings, pulverize, after crossing 100 mesh sieves, obtain chitosan/2-acrylamide-2-methylpro panesulfonic acid hydrogel (CS/AMPS).
Below by structure and the pattern of infrared spectra, X-ray diffraction, thermogravimetric analysis, scanning electron microscope exosyndrome material, by weighting method, its water absorbing properties is evaluated, evaluate its absorption property by the adsorptive capacity of hydrogel to cationic dyestuff.
1, infrared test
By DIGILAB FTS 3000 FT-IR type infrared spectrometer (KBr compressing tablet) at 400-4000 cm -1characterize the structure of matrix material.A is the infrared spectra of CS, at 3430-3391 cm -1there is wider absorption peak in place, this is superposed and broadening multi-absorption peak with the stretching vibration absorption peak of-NH by hydrogen bond association-OH, 1155 cm -1place is the charateristic avsorption band of C-O-C (glycosidic link); 1089 cm -1place is the stretching vibration absorption peak of secondary hydroxyl groups C3-OH in chitosan molecule; 1030 cm -1place is the charateristic avsorption band of chitosan molecule upper level hydroxyl C6-OH; 896 cm -1place is polysaccharide βthe characteristic peak of-configuration glycosidic link.
B is the infrared spectra of AMPS, 1666 cm -1place is the stretching vibration peak of C=O; 1613 cm -1place is the stretching vibration peak of C=C; 1242 cm -1place is the stretching vibration absorption peak of C-N; 1087 cm -1place is the stretching vibration of S=O; 626 cm -1place is the stretching vibration of S-O in sulfonic group.
C is the infrared spectra of CS/AMPS, can find out, after forming hydrogel, not only remains charateristic avsorption band (3417 cm of CS – 1), and 1613 cm of AMPS -1c=C stretching vibration peak in place disappears, and C=O has transferred at peak 1652 cm -1place, at 1045 cm -1there is the stretching vibration of S=O in place; 626 cm -1there is the stretching vibration of S-O in sulfonic acid group in place.Show that CS and AMPS there occurs graft copolymerization.
2, XRD test
With Rigaku D/max-2400 type X-ray powder diffractometer (source of radiation is CuK α, 40 kV, 150 mA, λ=0.15406 nm), CS/AMPS structure is tested.In Fig. 2, a, b are respectively the XRD figure of CS and CS/AMPS.As can be seen from a, CS in Fig. 22 θlocate the stronger diffraction peak of appearance 2 for=12.14 ° and 20.10 °.CS is formed after CS/AMPS hydrogel (b) through AMPS modification, 2 of CS θthe diffraction peak of=12.14 ° disappears, and 2 θthe diffraction peak at=20.10 ° of places moves on to 20.42 ° of places, and overall diffraction peak intensity reduces, and peak shape broadens, and presents mild Qiu Zhuanfeng.This may be that AMPS is grafted on CS, changes the accumulation shape of former CS, makes CS intramolecular hydrogen bond by destruction to a certain extent.In addition, there is strong interaction of hydrogen bond between the network structure that graft copolymerization is formed and the crystallization original to CS molecule produces interference, reduce the degree of crystallinity of CS, form amorphous mixture.
3, thermogravimetric test
By the thermostability of PE TG/DTA 6300 type thermogravimetric-differential scanning amount thermal analyzer working sample, nitrogen flow rate 50 mL/min, temperature range 20 ~ 700 DEG C, heat-up rate 10 DEG C/min Fig. 3 is the thermogravimetric curve of CS (a) and CS/AMPS (b).As can be seen from a in Fig. 3, the thermolysis of chitosan is divided into 2 stages, and 6.2% weightlessness of 25 ~ 148 DEG C is caused by the free water of adsorbing, irreducible water and a small amount of water of constitution slowly lose; 2nd stage 148 ~ 787 DEG C weightlessness 59.2 %, be that 700 DEG C of weightlessness are complete because the C-C bond rupture of chitosan main chain causes, total rate of weight loss is 65.4%.
CS/AMPS heat decomposition curve was divided into for three stages: first stage 25 ~ 309 DEG C of weightlessness 18.5%, caused by the free water, irreducible water and a small amount of small organic molecule that absorb slowly lose; 2nd stage 309 ~ 362 DEG C weightlessness 29.4%, this is because CS decomposition and AMPS lose caused by-NH; The weightlessness in the 3rd stage 30% occurs in 362 ~ 700 DEG C, and this is caused by main chain decomposition fracture, adjacent polymer chains dehydration, decarboxylation and sulfonic decomposition; 700 DEG C of weightlessness are complete, and total rate of weight loss is 77.9%.
Fig. 4 is the DTG curve of CS and CS/AMPS.Can find out, CS/AMPS maximum heat decomposition temperature is 332 DEG C, and the maximum heat decomposition temperature of CS is 308 DEG C, illustrates to there occurs effective chemical action between CS and AMPS, slow down the decomposition of thermal degradation products, improves the thermostability of CS/AMPS.
4, sem test
With the pattern of the Ultra Plus thermal field emission scanning electron microscopic observation CS/AMPS of German Zeiss, sample metal spraying after 60 DEG C of vacuum-drying before observing.Fig. 5 is the scanning electron microscope (left side amplifies 5000 times, and the right amplifies 10000 times) of CS/AMPS.As can be seen from Figure 5, after forming CS/AMPS, all materials presents the cellular three-dimensional net structure of even structure, and CS granule boundary is fuzzy, does not produce structural separation.Because polynuclear plane has larger specific surface area than smooth, spherical particle, when CS/AMPS meets water or dye solution, considerably increase the contact area of gel and water or dye molecule, this just means that the dye molecule in outside moisture or solution can fully contact with CS/AMPS hydrogel, diffuse into rapidly cellular three-dimensional net structure inner, effectively improve its water suction, adsorptive capacity and adsorption rate.
5, pH is to the performance test of CS/AMPS hydrogel Liquidity limit dyestuff
Take a small amount of xerogel respectively and put into the Viola crystallina (CV) of distilled water and 1000 mg/L, methylene blue (MB) and malachite green (MG) dye solution, vibrate under room temperature after 12 h and find, the colour-change of CS/AMPS is remarkable.Before swelling, xerogel is Off-white solid; After water suction, CS/AMPS hydrogel has certain water absorption and swelling; After absorbing dye, color and the pattern of CS/AMPS hydrogel there occurs wide variation, only has slight Swelling, snappiness is compared in distilled water higher with mechanical property, and gel outward appearance becomes the color of dyestuff, the CS/AMPS hydrogel prepared by this phenomenon proves can be used for the absorption of dyestuff in solution.
Various dyestuff pH value is regulated with NaOH and HCl of 0.1 mol/L.Dye solution (1000 mg/L respectively at 100 mL at 25 DEG C, pH=1 ~ 10) in add the CS/AMPS xerogel of 0.0300 g, with 120 r/min velocity fluctuations, filter after adsorbing 3 h, measure the absorbancy of adsorbing front and back solution in dyestuff maximum absorption wave strong point with UV757CRT Ver 2.00 ultraviolet-visible pectrophotometer of Shanghai Ke Heng industry development company limited, calculate the adsorptive capacity of dyestuff by (1) formula:
Wherein, qfor the adsorptive capacity (mg/g) of cationic dyestuff, mfor the quality (g) of xerogel, vfor liquor capacity (L), c 0with cfor the concentration (mg/L) of dyestuff before and after absorption.
Fig. 6 be pH to CS/AMPS hydrogel Liquidity limit dyestuff MG, the influence curve of MB and CV.All in all, when pH increases to 4 from 2, adsorptive capacity increase, and pH value adsorptive capacity 4 ~ 8 time higher and change not remarkable.This is because as pH < 4, great majority-SO 3 -be protonated form-SO 3h; In addition, containing a large amount of-OH in polymer chain, they mutually can form hydrogen bond and cause CS/AMPS volumetric shrinkage, and result dye molecule is difficult to diffuse into gel inside, causes adsorptive capacity little.But when pH=3, CS/AMPS still has certain absorption to MB, CV, MG, and adsorptive capacity is respectively 2488,908,876 mg/g, this may due to-OH in polymer chain and-SO 3amido (-NR in H and dyestuff 2) formed caused by hydrogen bond, the difference of adsorptive capacity may be relevant with dye structure.When pH is greater than 4 ,-SO 3h ionizes, negatively charged ion-SO 3 -between repulsion increase, to cause inside and outside gel permeable pressure head to increase, extension of network, it is inner that dye molecule can diffuse into gel three-dimensional network structure, with-OH ,-SO 3 -adsorbed by ion-exchange, hydrogen bond action and van der Waals interaction.
6, kinetics of adsorption
Accurately take 0.1000 g CS/AMPS xerogel three parts, the concentration that to join volume be respectively 160 mL concentration is the CV of 1500 mg/L, volume is 180 mL is the MB of 1000 mg/L and volume be 200 mL concentration is in the cationic dyestuff solution of the MG of 900 mg/L, with 120 r/min vibrations in the constant temperature oscillation case of 25 DEG C, sample at regular intervals, measure absorbancy after dilution, calculate adsorptive capacity by formula (1).The time dependent relation of adsorptive capacity is shown in Fig. 7.As can be seen from Figure 7, hydrogel is very fast to the adsorption rate of three kinds of dyestuffs in 50 min, afterwards along with the prolongation adsorption rate of time is slack-off, adsorbs and substantially tend to balance after 2 h, illustrate that gel has adsorption rate faster to dyestuff.The CS/AMPS hydrogel proving to have cellular three-dimensional net structure is conducive to shortening adsorption time.
7, dye strength is on the impact of adsorptive capacity
Accurately take 0.030 g xerogel number part and put into 100 mL vials, add three kinds of dye solutions (CV and MB100 mL, MG 50 mL) of the different concns gradient of pH=6.2, in 120 r/min constant temperature oscillators after balanced oscillations, measure absorbancy, calculate adsorptive capacity.Fig. 8 is initial dye concentration (CV 500 ~ 1300 mg/L, MB 500 ~ 1200 mg/L, the MG 300 ~ 800mg/L) impact on gel adsorption amount.Can find out, the adsorptive capacity of CS/AMPS hydrogel to three kinds of dyestuffs increases with the increase of dye strength.In addition, research finds, in lower concentration dyestuff, gel can water absorption and swelling, and in high density dyestuff, gel only has slight swelling.This is because gel there occurs competition that is swelling and absorption, in high density dyestuff ,-SO in gel 3 -with cationic dyestuff generation ion-exchange, meanwhile, in gel-OH also can with dyestuff generation hydrogen bond action, cause gel cross-linkage degree to increase, inside and outside osmotic pressure reduces, and swelling ratio declines, and adsorptive capacity increases.Experiment shows, this gel is suitable for the absorption research of high density dyestuff.
In a word, on the absorption property impact of CS/AMPS comparatively greatly, optimal adsorption pH scope is 4.5 ~ 6 for pH value of solution and dye strength, with the increase of dye strength, adsorptive capacity increases gradually, is respectively: 2564 to the maximal absorptive capacity of methylene blue, Viola crystallina and malachite green, 3272,1343 mg/g.
8, the selection of stripping liquid
The mensuration of desorption efficiency: the stripping liquid being mixed with different ratios with 0.1 mol/L HCl solution and analytical pure ethanol, the gel having adsorbed dyestuff MG is put into stripping liquid reach desorb balance after, measure absorbancy, computational solution pipette and desorption efficiency.Desorption efficiency (η) calculates by (2) formula:
η=100%× q 2/ q 1（2）
Wherein, q 2(mg/g) be the amount of dyestuff release in elutriant; q 1(mg/g) amount of dyestuff for hydrogel adsorbs.
Carry out desorption experiment to the gel after absorption MG dyestuff, desorption quantity and desorption efficiency (desorption quantity and repetition adsorptive capacity are all for radix calculates with the amount of previous absorbing dye) list in table 1.Can find out, during with single hydrochloric acid or ethanol as stripping liquid, desorption efficiency is lower; And when doing stripping liquid by ethanol and HYDROCHLORIC ACID MIXED SOLVENT, desorption efficiency is relatively high, the best desorption condition of MG is: 40:60 ( v hydrochloric acid: v ethanol); Desorption efficiency can reach 89.26%.The desorption efficiency of CV and MB is lower in hydrochloric acid and alcohol mixed solvent, though do not list in Table 1, their not desorbs can not be described, just because we also do not find suitable stripping liquid.
9, the regeneration of hydrogel and reusing
The xerogel really taking certain mass is in 250 mL Erlenmeyer flasks, and the concentration adding pH=6.2 is the MG dye solution of 1000 mg/L, vibrates, measure absorbancy after reaching balance under 120 r/min, calculates adsorptive capacity.The gel adsorbing MG is put into optimum solution imbibition desorb, computational solution pipette and desorption efficiency, repeat 3 times, experimental data is in table 2.Can find out, after adsorptive capacity once and desorption quantity all once have certain increase than front.This may be that gel micropore size in absorption-desorption process increases, and adsorption surface area increases, and more MG dye molecules enter micropore and cause adsorptive capacity to increase.Illustrate thus, the absorption of CS/AMPS to dyestuff has certain desorption behavior and regenerative power.
With N, N'-methylene-bisacrylamide for linking agent, Keep agitation just high yield can obtain CS/AMPS hydrogel at a certain temperature.This method is simple to operate, and degree of crosslinking controls by changing N, N'-methylene-bisacrylamide content, without any initiator added ingredients, does not pollute the environment, and a step can complete the preparation of product.Compared with traditional method, preparation technology is simple, and method environmental protection, the CS/AMPS hydrogel structure of synthesis is even.In addition, the CS/AMPS obtained has good adsorptivity to cationic dyestuff, is a kind of sorbing material of excellent performance, has broad application prospects in dyestuff and effluent containing heavy metal ions purification.
In sum, hinge structure of the present invention has following effect:
1, the present invention with chitosan and 2-acrylamide-2-methylpro panesulfonic acid for raw material, N, N'-methylene-bisacrylamide (MBA) is linking agent, in water solution system, a step obtains chitosan/2-acrylamide-2-methylpro panesulfonic acid (CS/AMPS) hydrogel, preparation technology is simple, and synthesis cost is low;
2, preparation condition gentleness of the present invention is (without the need to N 2), do not need any initiator, do not need other initiation methods yet, avoid secondary pollution that initiator brings and cause the material of synthesis uneven;
3, the whole preparation process of the present invention is carried out in water solution system, simplifies the Enrichment purification technique of hydrogel, decreases the pollution of emulsifying agent to material, improve the purity of material, enhance its biological safety;
4, the CS/AMPS material that prepared by the present invention has higher adsorptive capacity, faster adsorption rate, and being applicable to the purification of dyeing waste water and heavy metal wastewater thereby, is a kind of sorbent material of excellent performance;
5, the material that prepared by the present invention has cellular three-dimensional net structure, and thermostability is higher, and be difficult to decompose before 200 DEG C, thus the scope of application is wider;
6, the material that prepared by the present invention has absorption-desorption function repeatedly, therefore can reuse.
Accompanying drawing explanation
Fig. 1 is the infrared spectra of CS (a), AMPS (b) and CS/AMPS (c);
Fig. 2 is that CS (a) composes with the XRD of CS/AMPS (b);
Fig. 3 is the TG curve of CS (a) and CS/AMPS (b);
Fig. 4 is the DTG curve of CS (a) and CS/AMPS (b);
Fig. 5 is the SEM pattern of CS/AMPS;
Fig. 6 is the impact of dye solution pH on CS/AMPS adsorptive capacity;
Fig. 7 is CS/AMPS curve of adsorption kinetics;
Fig. 8 is the adsorptive capacity test of CS/AMPS in different concns dye solution.
Embodiment
Below in conjunction with specific embodiment to the preparation of CS/AMPS hydrogel of the present invention and water absorbing properties thereof and be described further the absorption property of cationic dyestuff.
Embodiment 1
0.5 g CS and 15 mL distilled water are added in 100 mL there-necked flasks, 0.5 h is stirred at 75 DEG C, then 3 g AMPS and 0.04 g N are added, N'-methylene-bisacrylamide (MBA), continue stirring 15 min, solution becomes oyster white, stir 3 h at 75 DEG C after, white g., jelly-like gel produces, and then cooled product is to room temperature.Take out product scissors and be cut into the fragment that length is 2 ~ 5 mm, make-SO with 1 mol/LNaOH 3the degree of neutralization of H reaches 70%, and afterwards, product distilled water wash for several times to remove unreacted monomer, then with washing with alcohol several, namely obtains CS/AMPS hydrogel 60 DEG C of vacuum-dryings to constant weight, and pulverize, cross 100 mesh sieves, productive rate is about 62%.
Performance index are as follows:
Water absorbing properties: 93.6 g/g;
Liquidity limit dyestuff performance: the adsorptive capacity of CS/AMPS hydrogel to MB, CV and MG is respectively 1326.4,2979.4 and 193.9 mg/g.
Embodiment 2
0.5 g CS and 15 mL distilled water are added in 100 mL there-necked flasks, 0.5 h is stirred at 70 DEG C, then 5 g AMPS and 0.065 g N are added, N'-methylene-bisacrylamide (MBA), continue stirring 10 min, solution becomes oyster white, stir 2 h at 75 DEG C after, white g., jelly-like gel produces, and then cooled product is to room temperature.Take out product scissors and be cut into the fragment that length is 2 ~ 5 mm, make SO with 1mol/LNaOH 3the degree of neutralization of H reaches 80%, afterwards, product distilled water wash for several times to remove unreacted monomer, then with washing with alcohol for several times, 60 onamely C vacuum-drying obtain CS/AMPS hydrogel to constant weight, and pulverized 100 mesh sieves, productive rate is about 82%.
Performance index are as follows:
Water absorbing properties: 222.8 g/g;
Liquidity limit dyestuff performance: the adsorptive capacity of CS/AMPS hydrogel to MB, CV and MG is respectively 748.0,3533.9 and 1175.5 mg/g.
Embodiment 3
0.5 g CS and 20 mL distilled water are added in 100 mL there-necked flasks, 0.5 h is stirred at 70 DEG C, then 7 g AMPS and 0.080 g N are added, N'-methylene-bisacrylamide (MBA), continue stirring 10 min, solution becomes oyster white, stir 3 h at 75 DEG C after, have oyster white g., jelly-like gel to produce, then cooled product is to room temperature.Take out product scissors and be cut into the fragment that length is 2 ~ 5 mm, make-SO with 1mol/LNaOH 3the degree of neutralization of H reaches 90%, afterwards, product distilled water wash for several times to remove unreacted monomer, then with washing with alcohol for several times, namely obtain CS/AMPS hydrogel 60 DEG C of vacuum-dryings to constant weight, pulverized 100 mesh sieves, productive rate is about 85%.
Performance index are as follows:
Water absorbing properties: 175.5 g/g;
Liquidity limit dyestuff performance: the adsorptive capacity of CS/AMPS hydrogel to MB, CV and MG is respectively 1789.8,3423.5 and 1271.0 mg/g.

Claims (6)

1. the preparation method of chitosan/2-acrylamide-2-methylpro panesulfonic acid hydrogel, for raw material with chitosan, 2-acrylamide-2-methylpro panesulfonic acid, N, N'-methylene-bisacrylamide is linking agent, directly carries out crosslinking reaction and obtain in water solution system.
2. the preparation method of chitosan/2-acrylamide-2-methylpro panesulfonic acid hydrogel as claimed in claim 1, it is characterized in that: first by chitosan dispersed with stirring in water, add 2-acrylamide-2-methylpro panesulfonic acid and N again, N'-methylene-bisacrylamide, there is oyster white in dispersed with stirring solution; Then 30 ~ 180 min are stirred at 60 ~ 80 DEG C; Cooled product, to room temperature, obtains oyster white g., jelly-like polymkeric substance; Shred, make degree of neutralization reach 40% ~ 90% with NaOH neutralization, then by product distilled water wash to remove unreacted monomer, then use absolute ethanol washing, dry, pulverize, cross 100 mesh sieves, obtain chitosan/2-acrylamide-2-methylpro panesulfonic acid hydrogel product.
3. the preparation method of chitosan/2-acrylamide-2-methylpro panesulfonic acid hydrogel as claimed in claim 1 or 2, is characterized in that: the mass ratio of chitosan and 2-acrylamide-2-methylpro panesulfonic acid is 1:6 ~ 1:20.
4. the preparation method of chitosan/2-acrylamide-2-methylpro panesulfonic acid hydrogel as claimed in claim 1 or 2, is characterized in that: the consumption of linking agent is 0.02 ~ 0.16 times of chitosan mass.
5. the preparation method of chitosan/2-acrylamide-2-methylpro panesulfonic acid hydrogel as claimed in claim 1 or 2, it is characterized in that: in water solution system, the quality of water is 20 ~ 70 times of chitosan mass.
6. the preparation method of chitosan/2-acrylamide-2-methylpro panesulfonic acid hydrogel as claimed in claim 1 or 2, is characterized in that: drying is 40 ~ 70 DEG C of oven dry.
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CN105903442A (en) * 2016-05-10 2016-08-31 西北师范大学 Preparation of polysaccharide-base hydrogel and application of polysaccharide-base hydrogel as adsorbent to waste water treatment
CN107159290B (en) * 2017-04-24 2018-08-10 长江大学 Oxygen reduction catalyst and preparation method thereof based on polyalcohol hydrogel
CN107159290A (en) * 2017-04-24 2017-09-15 长江大学 Oxygen reduction catalyst based on polyalcohol hydrogel and preparation method thereof
CN108360072A (en) * 2018-02-25 2018-08-03 温岭汉德高分子科技有限公司 A kind of monocrystalline silicon flocking additive based on the poly- 2- acrylamide-2-methylpro panesulfonic acids sodium copolymer of chitosan-
CN108360071A (en) * 2018-02-25 2018-08-03 温岭汉德高分子科技有限公司 A kind of etching method of antiradar reflectivity monocrystalline silicon piece
CN110294858A (en) * 2019-06-25 2019-10-01 常州大学 It is a kind of can sequence detection anion, metal cation and dye molecule hydrogel sensing membrane and preparation method thereof
CN110294858B (en) * 2019-06-25 2022-01-25 常州大学 Hydrogel sensing membrane capable of sequentially detecting anions, metal cations and dye molecules and preparation method thereof
CN111013553A (en) * 2019-12-26 2020-04-17 西南石油大学 Methylene blue and rhodamine B adsorbent and preparation method thereof
CN111013553B (en) * 2019-12-26 2022-02-11 西南石油大学 Methylene blue and rhodamine B adsorbent and preparation method thereof
CN111574972A (en) * 2020-06-19 2020-08-25 中国石油大学(华东) Environment-friendly high-temperature-resistant shale inhibitor for water-based drilling fluid and preparation method thereof
CN111574972B (en) * 2020-06-19 2021-01-26 中国石油大学(华东) Environment-friendly high-temperature-resistant shale inhibitor for water-based drilling fluid and preparation method thereof

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