CN104829788B - The preparation method of the methyl propane sulfonic acid hydrogel of chitosan/2 acrylamido 2 - Google Patents
The preparation method of the methyl propane sulfonic acid hydrogel of chitosan/2 acrylamido 2 Download PDFInfo
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Abstract
The invention discloses the new method that one kind prepares the chitosan/methyl propane sulfonic acid of 2 acrylamido 2 (CS/AMPS) hydrogel, it is using chitosan, the methyl propane sulfonic acid of 2 acrylamido 2 as raw material, N, N' methylene-bisacrylamides (MBA) are crosslinking agent, directly carry out cross-linking reaction in water solution system and obtain.Compared with conventional method, preparation technology of the present invention is simple, it is green, cost is cheap, the CS/AMPS hydrogel structures of synthesis are uniform, have higher adsorbance, the faster rate of adsorption, there is good adsorptivity to the dye of positive ion, it is a kind of sorbing material of excellent performance, is had broad application prospects in terms of dyestuff and effluent containing heavy metal ions purification.
Description
Technical field
The present invention relates to one kind to prepare the new of chitosan/2- acrylamide-2-methylpro panesulfonic acids (CS/AMPS) hydrogel
Method, belong to functional high polymer material field.
Background technology
Chitosan (Chitosan, CS) is the deacetylated product in part of chitin, is be only second to cellulose second
Big multi-polysaccharide natural macromolecule compound.The good biocompatibility of chitosan, and can be biodegradable, catabolite is nontoxic
Property；Chitosan-phospholipid complex also has antiviral property, microbial resistance, unique property such as sequestering of heavy metal ion
Matter.They are expected to be applied in insoluble drug release, heavy metal recovery, sewage disposal, UF membrane, daily-use chemical industry etc..However,
Free amine group in chitosan molecule can receive proton into salt, can dissolve in an acidic solution, cause to be lost in, seriously limitation
Its application.Therefore, it is one of focus of current chitin modified research to improve acid resistance.The hydroxyl enriched in chitosan molecule chain
Base and amino make it easier to be chemically modified, and such as introduce stimuli responsive type polymerization by acylated, carboxylation and hydroxylating are modified
Thing or small molecule, assign chitosan new structure and performance, become by natural polysaccharide and synthesize that high score is molecular to be had
The intelligent macromolecule hydrogel of three-dimensional net structure, substantially improves the water solubility and moisture retention of chitosan, and changes chitosan point
Liberation characteristic of the sub- side-chain radical in different pH value.Accordingly, chitosan-based hydrogel material is expected in health care, agriculture
Wooden land skill, sewage purification, biomaterial etc. have certain application value.
So far, the main preparation methods of chitosan-based hydrogel have chemistry initiation method, radiation initiation method and light to draw
Hair method, also occur some reports triggered on microwave recently.In general, chitosan-based hydrogel is chemically prepared
During need N2Protection, and a small amount of initiator is added, produce secondary pollution.And physics initiation is also required to N2Protection, though without two
Secondary pollution, but caused hydrogel structure is uneven.
2- acrylamide-2-methylpro panesulfonic acids (AMPS) are a kind of containing hydrophily sulfonate functional group and nonionic acyl
The anionic vinyl base monomer of amido, sulfonic group make it have ion exchangeable, and active carbon-carbon double bond makes it easily gather
Close, addition reaction.In general, CS/AMPS hydrogels can be by chitosan (CS) and 2- acrylamide-2-methylpro panesulfonic acids
(AMPS) obtained in acetum under nitrogen protection using chemistry initiation, radiation initiation, uv-light polymerization and crosslinking, but
Step is various, produces secondary pollution, and performance is bad.
The content of the invention
The defects of purpose of the present invention is for synthesizing harsh CS/AMPS conditions, poor performance in the prior art, there is provided a kind of
The new method of convenient, fast synthesis CS/AMPS hydrogels.
The novel preparation method of CS/AMPS hydrogels of the present invention, with chitosan (CS) and 2- acrylamido -2- methyl-prop sulphurs
Sour (AMPS) is raw material, and N, N'- methylene-bisacrylamides (MBA) are crosslinking agent, in aqueous, one are stirred under certain temperature
Chitosan/2- acrylamide-2-methylpro panesulfonic acids (CS/AMPS) hydrogel is made in step.
Specifically preparation technology is：0.2 ~ 0.6 g CS of addition and 20 ~ 70 times of water in 250 mL there-necked flasks, 30 ~ 90
5-30 min are stirred with 90 ~ 120 r/min at DEG C, then add 6 ~ 20 times of AMPS and 0.02-0.16 times of crosslinking agent MBA, after
There is milky in 20 min of continuous stirring, solution, continue to stir 30 ~ 180 min at 60 ~ 80 DEG C, cooled product to room temperature, obtain
White g., jelly-like product, take out.Product is cut to the mm of diameter about 2 ~ 5 fragment, then makes degree of neutralization with 1 mol/L NaOH neutralizations
Water washing is distilled for several times to remove unreacted monomer up to 40% ~ 90%, then by product, and absolute ethyl alcohol washs for several times, 40 ~ 70 DEG C
It dry, pulverize, after crossing 100 mesh sieves, obtain chitosan/2- acrylamide-2-methylpro panesulfonic acids hydrogel (CS/AMPS).
The structure and pattern of material are characterized below by infrared spectrum, X-ray diffraction, thermogravimetric analysis, ESEM, with title
Weight method is evaluated its water absorbing properties, and its absorption property is evaluated to the adsorbance of the dye of positive ion with hydrogel.
1st, infrared test
With the FT-IR types infrared spectrometers (KBr tablettings) of DIGILAB FTS 3000 in 400-4000 cm-1Characterize composite wood
The structure of material.A is CS infrared spectrum, in 3430-3391 cm-1There is wider absworption peak in place, this be by hydrogen bond association-
OH is superimposed and broadening multi-absorption peak with-NH stretching vibration absworption peak, 1155 cm-1Locate as the feature of C-O-C (glycosidic bond)
Absworption peak；1089 cm-1Locate as the stretching vibration absworption peak of secondary hydroxyl groups C3-OH in chitosan molecule；1030 cm-1Locate as shell
Glycan molecule upper level hydroxyl C6-OH characteristic absorption peak；896 cm-1Locate as polysaccharideβThe characteristic peak of-configuration glycosidic bond.
B be AMPS infrared spectrum, 1666 cm-1Locate the stretching vibration peak for C=O；1613 cm-1Locate as the flexible of C=C
Vibration peak；1242 cm-1Locate the stretching vibration absworption peak for C-N；1087 cm-1Locate the stretching vibration for S=O；626 cm-1Locate be
S-O stretching vibration in sulfonic group.
C is CS/AMPS infrared spectrum, it can be seen that after forming hydrogel, not only remains CS characteristic absorption peak
(3417 cm–1), and AMPS 1613 cm-1Locate C=C stretching vibration peaks to disappear, C=O peaks have been transferred to 1652 cm-1Place,
1045 cm-1There is S=O stretching vibration in place；626 cm-1There is the stretching vibration of S-O in sulfonic acid group in place.Show CS with
There occurs graft copolymerization by AMPS.
2nd, XRD is tested
With Rigaku D/max-2400 type X-ray powder diffractions instrument, (radiation source is CuK α, 40 kV, 150 mA, λ
=0.15406 nm) CS/AMPS structures are tested.A, b are respectively CS and CS/AMPS XRD in Fig. 2.Can by a in Fig. 2
To find out, CS is 2θOccur 2 stronger diffraction maximums at=12.14 ° and 20.10 °.CS is modified to form CS/AMPS by AMPS
After hydrogel (b), the 2 of CSθ=12.14 ° of diffraction maximum disappears, and 2θDiffraction maximum at=20.10 ° is moved on at 20.42 °, and
Overall diffraction peak intensity reduces, and peak shape broadens, and gentle Qiu Zhuanfeng is presented.This is probably that AMPS is grafted on CS, changes original
CS accumulation shape, make CS intramolecular hydrogen bonds by a certain degree of destruction.In addition, between the network structure that graft copolymerization is formed
The crystallization original to CS molecules in the presence of strong interaction of hydrogen bond produces interference, reduces CS crystallinity, is formed amorphous
Compound.
3rd, thermogravimetric is tested
With the heat endurance of the type thermogravimetrics of PE TG/DTA 6300-differential scanning amount thermal analyzer determination sample, nitrogen flow rate
50 mL/min, 20 ~ 700 DEG C of temperature range, the thermogravimetric that 10 DEG C/min of programming rate Fig. 3 is CS (a) and CS/AMPS (b) are bent
Line.The thermal decomposition of chitosan is divided into 2 stages it can be seen from a in Fig. 3,25 ~ 148 DEG C of 6.2% weightlessness be by adsorb from
Caused by water, irreducible water and a small amount of constitution water slowly lose；2nd 148 ~ 787 DEG C of the stage % of weightlessness 59.2, it is due to
The C-C keys fracture of chitosan main chain causes, and 700 DEG C of weightlessness finish, and total weight loss rate is 65.4%.
CS/AMPS heat decomposition curves were divided into for three stages：25 ~ 309 DEG C of weightlessness 18.5% of first stage, for the Free water of absorption,
Caused by irreducible water and a small amount of small organic molecule slowly lose；2nd 309 ~ 362 DEG C of stage weightlessness 29.4%, this is due to
CS decomposition and AMPS are lost caused by-NH；The weightless of 3rd stage 30% occurs at 362 ~ 700 DEG C, and this is due to that main chain decomposition breaks
Split, caused by adjacent polymer chains dehydration, decarboxylation and sulfonic decomposition；700 DEG C of weightlessness finish, and total weight loss rate is 77.9%.
Fig. 4 is CS and CS/AMPS DTG curves.As can be seen that CS/AMPS maximums heat decomposition temperature is 332 DEG C, and
CS maximum heat decomposition temperature is 308 DEG C, illustrates to slow down thermal degradation production there occurs effective chemical action between CS and AMPS
The decomposition of thing, improve CS/AMPS heat endurance.
4th, sem test
With German Zeiss Ultra Plus thermal field emission scanning electron microscopic observations CS/AMPS pattern, sample exists before observation
Metal spraying after 60 DEG C of vacuum drying.The ESEM that Fig. 5 is CS/AMPS (left side amplifies 5000 times, and the right amplifies 10000 times).From
Fig. 5 can be seen that to form CS/AMPS after, material totally present even structure cellular three-dimensional net structure, CS granule boundaries
It is fuzzy, do not produce the separation in structure.Because alveolate texture than smooth, spherical particle has bigger specific surface area, when
When CS/AMPS meets water or dye solution, the contact area of gel and water or dye molecule is considerably increased, this means that the external world
Dye molecule in hydrone or solution can be contacted fully with CS/AMPS hydrogels, diffuse rapidly into cellular three-dimensional network
Inside configuration, effectively improve its water suction, adsorbance and rate of adsorption.
5th, performance tests of the pH to CS/AMPS hydrogel Liquidity limit dyestuffs
A small amount of xerogel is weighed respectively to be put into distilled water and 1000 mg/L crystal violet (CV), methylene blue (MB)
In malachite green (MG) dye solution, found after vibrating 12 h at room temperature, CS/AMPS color change is notable.Before swelling, do
Gel is Off-white solid；After water suction, CS/AMPS hydrogels have certain water absorption and swelling；After adsorbing dyestuff, CS/AMPS water-settings
There occurs great changes, only slight Swelling, pliability to be compared with mechanical performance in distilled water for the color and pattern of glue
In it is higher, and gel outward appearance is changed into the color of dyestuff, and this phenomenon proves that prepared CS/AMPS hydrogels can be used in solution
The absorption of dyestuff.
Various dyestuff pH value are adjusted with 0.1 mol/L NaOH and HCl.Respectively in 100 mL dye solution at 25 DEG C
0.0300 g CS/AMPS xerogel is added in (1000 mg/L, pH=1 ~ 10), with 120 r/min velocity fluctuations, adsorbs 3 h
After filter, with the ultraviolet-uisible spectrophotometers of UV757CRT Ver 2.00 of Shanghai Ke Heng industry developments Co., Ltd in dyestuff
The absorbance of solution before and after the measure absorption of maximum absorption wave strong point, the adsorbance of dyestuff is calculated with (1) formula：
Wherein,qFor the adsorbance (mg/g) of the dye of positive ion,mFor the quality (g) of xerogel,VFor liquor capacity (L),C 0
WithCFor the concentration (mg/L) of dyestuff before and after absorption.
Fig. 6 is influence curves of the pH to CS/AMPS hydrogel Liquidity limit dyestuffs MG, MB and CV.All in all, pH is worked as
When increasing to 4 from 2, adsorbance increase, and pH value adsorbance at 4 ~ 8 is higher and change is not notable.Because work as pH< 4
When, most of-SO3 -It is protonated form-SO3H；In addition, containing substantial amounts of-OH in polymer chain, they can be mutually formed
Hydrogen bond and cause CS/AMPS volume contractions, as a result dye molecule is difficult to diffuse into inside gel, causes adsorbance small.However,
In pH=3, for CS/AMPS to MB, CV, MG still have certain absorption, and adsorbance is respectively 2488,908,876 mg/g, and this can
Can be due to-OH in polymer chain and-SO3H and the amido (- NR in dyestuff2) formed caused by hydrogen bond, the difference of adsorbance may be with
Dye structure is relevant.When pH is more than 4 ,-SO3H is ionized, anion-SO3 -Between repulsion increase, cause inside and outside gel
Permeable pressure head increases, and network extension, dye molecule can be diffused into inside gel three-dimensional network structure, with-OH ,-SO3 -Pass through
Ion exchange, hydrogen bond action and van der Waals interaction and adsorb.
6th, adsorption dynamics adsorption kinetics
0.1000 three parts of g CS/AMPS xerogel accurately is weighed, it is that 160 mL concentration are 1500 to be added separately to volume
Mg/L CV, volume are the MB that 180 mL concentration is 1000 mg/L and volume is MG that 200 mL concentration are 900 mg/L
In dye of positive ion solution, vibrated, sampled at regular intervals, after dilution with 120 r/min in 25 DEG C of constant temperature oscillation case
Absorbance is determined, adsorbance is calculated by formula (1).The relation that adsorbance changes over time is shown in Fig. 7.From figure 7 it can be seen that hydrogel
Very fast to the rate of adsorption of three kinds of dyestuffs in 50 min, the extension rate of adsorption afterwards over time is slack-off, and base is adsorbed after 2 h
Originally tend to balance, illustrate that gel has the faster rate of adsorption to dyestuff.Prove the CS/AMPS with cellular three-dimensional net structure
Hydrogel is advantageous to shorten adsorption time.
7th, influence of the dye strength to adsorbance
Accurately weigh 0.030 g xerogel numbers part to be put into 100 mL vials, add the various concentrations gradient of pH=6.2
Three kinds of dye solutions (mL of CV and MB100 mL, MG 50), in 120 r/min constant temperature oscillators after balanced oscillations, measure
Absorbance, calculate adsorbance.Fig. 8 be initial dye concentration (CV 500 ~ 1300 mg/L, MB 500 ~ 1200 mg/L, MG 300 ~
800mg/L) to the influence of gel adsorption amount.As can be seen that CS/AMPS hydrogels to the adsorbance of three kinds of dyestuffs with dye strength
Increase and increase.In addition, research is found, and in low concentration dyestuff, gel meeting water absorption and swelling, in high concentration dyestuff, gel
Only slight swelling.Because the competition that gel is swelled and adsorbed, in high concentration dyestuff ,-SO in gel3 -With sun
Ion exchange occurs for ionic dye, meanwhile, also with dyestuff hydrogen bond action can occur for-OH in gel, cause gel cross-linkage degree to increase,
Inside and outside osmotic pressure reduces, and swelling ratio declines, adsorbance increase.Experiment shows that the absorption that the gel is suitable for high concentration dyestuff is ground
Study carefully.
In a word, pH value of solution and dye strength have a great influence to CS/AMPS absorption property, optimal adsorption pH scopes be 4.5 ~
6, with the increase of dye strength, adsorbance gradually increases, and the maximal absorptive capacity of methylene blue, crystal violet and malachite green is distinguished
For：2564, 3272, 1343 mg/g.
8th, the selection of stripping liquid
The measure of desorption efficiency：The stripping liquid of different proportion is configured to 0.1 mol/L HCl solutions and analysis straight alcohol, will
The gel for having adsorbed dyestuff MG is put into stripping liquid up to after desorption balance, is determined absorbance, is calculated desorption quantity and desorption efficiency.Desorption
Rate（η）Calculated by (2) formula：
η=100%×q 2/q 1（2）
Wherein,q 2(mg/g) amount discharged for dyestuff in eluent；q 1(mg/g) it is the amount of the dyestuff adsorbed on hydrogel.
Desorption experiment is carried out to the gel after absorption MG dyestuffs, (desorption quantity and repetition adsorbance are all for desorption quantity and desorption efficiency
It is to be calculated by radix of the amount of previous adsorption dyestuff) it is listed in table 1.As can be seen that stripping liquid is used as by the use of single hydrochloric acid or ethanol
When, desorption efficiency is relatively low；And when doing stripping liquid with ethanol and HYDROCHLORIC ACID MIXED SOLVENT, desorption efficiency is of a relatively high, MG optimal desorption bar
Part is：40:60(V Hydrochloric acid:V Ethanol)；Desorption efficiency is up to 89.26%.CV and MB desorption efficiency in hydrochloric acid and alcohol mixed solvent compared with
It is low, though not listed in table 1, it can not illustrate that they are not desorbed, only because we do not find suitable desorption also
Liquid.
9th, the regeneration of hydrogel and reusing
The xerogel of certain mass is really weighed in 250 mL conical flasks, the concentration for adding pH=6.2 is 1000 mg/L's
MG dye solutions, vibrated under 120 r/min, up to balance after determine absorbance, calculate adsorbance.The gel for having adsorbed MG is put
Enter and desorbed in optimal stripping liquid, calculate desorption quantity and desorption efficiency, be repeated 3 times, experimental data is shown in Table 2.After as can be seen that once
Adsorbance and desorption quantity once have certain increase than preceding.This is probably that gel micropore size during absorption-desorption increases
Greatly, adsorption surface area increases, and more MG dye molecules, which enter micropore, causes adsorbance to increase.Thus illustrate, CS/AMPS is to dyestuff
Absorption there is certain desorption behavior and power of regeneration.
With N, N'- methylene-bisacrylamides are crosslinking agent, lasting stirring at a certain temperature can high yield obtain CS/
AMPS hydrogels.This method is simple to operate, and the degree of cross linking can be by changing N, and N'- methylene-bisacrylamides content controls,
Without any initiator adding ingredient, do not pollute the environment, the preparation of product can be completed with a step.Compared with conventional method, prepare
Technique is simple, and method is green, and the CS/AMPS hydrogel structures of synthesis are uniform.In addition, obtained CS/AMPS is to cation
Dyestuff has good adsorptivity, is a kind of sorbing material of excellent performance, has in terms of dyestuff and effluent containing heavy metal ions purification
Have broad application prospects.
In summary, the present invention has the following effects that compared with the prior art：
1st, the present invention is using chitosan and 2- acrylamide-2-methylpro panesulfonic acids as raw material, N, N'- methylene bisacrylamide acyls
Amine (MBA) is crosslinking agent, and chitosan/2- acrylamide-2-methylpro panesulfonic acids (CS/ is made in a step in water solution system
AMPS) hydrogel, preparation technology is simple, and synthesis cost is low；
2nd, preparation condition of the present invention is gentle (without N2), any initiator is not required to, other initiation methods is also not required to, avoids
The secondary pollution and trigger the material of synthesis uneven that initiator is brought；
3rd, whole preparation process of the present invention is carried out in water solution system, simplifies the Enrichment purification technique of hydrogel,
Reduce pollution of the emulsifying agent to material, improve the purity of material, enhance its biological safety；
4th, CS/AMPS materials prepared by the present invention have higher adsorbance, the faster rate of adsorption, are adapted to dyeing waste water
It is a kind of adsorbent of excellent performance with the purification of heavy metal wastewater thereby；
5th, material prepared by the present invention has cellular three-dimensional net structure, and heat endurance is higher, before 200 DEG C very
Hardly possible is decomposed, thus the scope of application is wider；
6th, material prepared by the present invention has absorption-desorption function repeatedly, therefore repeatable utilization.
Brief description of the drawings
Fig. 1 is CS (a), AMPS (b) and CS/AMPS (c) infrared spectrum；
The XRD that Fig. 2 is CS (a) and CS/AMPS (b) is composed；
Fig. 3 is CS (a) and CS/AMPS (b) TG curves；
Fig. 4 is CS (a) and CS/AMPS (b) DTG curves；
Fig. 5 is CS/AMPS SEM patterns；
Fig. 6 is influences of the dye solution pH to CS/AMPS adsorbances；
Fig. 7 is CS/AMPS curve of adsorption kinetics；
Fig. 8 is adsorbance tests of the CS/AMPS in various concentrations dye solution.
Embodiment
With reference to preparation of the specific embodiment to CS/AMPS hydrogels of the present invention and its water absorbing properties and to cation
The absorption property of dyestuff is described further.
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 adds 3
G AMPS and 0.04 g N, N'- methylene-bisacrylamides (MBA), continue to stir 15 min, solution is changed into milky, 75
After 3 h are stirred at DEG C, white g., jelly-like gel produces, then cooled product to room temperature.Take out product and be cut into length with scissors as 2
~ 5 mm fragment, make-SO with 1 mol/LNaOH3H degree of neutralization reaches 70%, and afterwards, product distills water washing for several times to remove
Unreacted monomer is removed, then is washed for several times with ethanol, being dried under vacuum to constant weight at 60 DEG C obtains CS/AMPS hydrogels, powder
It is broken, 100 mesh sieves are crossed, yield is about 62%.
Performance indications are as follows：
Water absorbing properties：93.6 g/g；
Liquidity limit dyestuff performance：CS/AMPS hydrogels are respectively 1326.4 to MB, CV and MG adsorbance,
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 adds 5
G AMPS and 0.065 g N, N'- methylene-bisacrylamides (MBA), continue to stir 10 min, solution is changed into milky, 75
After 2 h are stirred at DEG C, white g., jelly-like gel produces, then cooled product to room temperature.Take out product and be cut into length with scissors as 2
~ 5 mm fragment, make SO with 1mol/LNaOH3H degree of neutralization reaches 80%, and afterwards, product is with distillation water washing for several times with removing
Unreacted monomer, then washed for several times with ethanol, 60oC is dried under vacuum to constant weight and obtains CS/AMPS hydrogels, crushed
100 mesh sieves, yield are about 82%.
Performance indications are as follows：
Water absorbing properties：222.8 g/g；
Liquidity limit dyestuff performance：CS/AMPS hydrogels are respectively 748.0,3533.9 to MB, CV and MG adsorbance
With 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, is then added
7 g AMPS and 0.080 g N, N'- methylene-bisacrylamides (MBA), continuing to stir 10 min, solution is changed into milky,
After 3 h are stirred at 75 DEG C, there is the generation of milky g., jelly-like gel, then cooled product to room temperature.Product is taken out to be cut into scissors
Length is 2 ~ 5 mm fragment, makes-SO with 1mol/LNaOH3H degree of neutralization reaches 90%, afterwards, product distillation water washing number
Secondary then to be washed for several times with ethanol with removing unreacted monomer, being dried under vacuum to constant weight at 60 DEG C obtains CS/AMPS water-settings
Glue, crushed 100 mesh sieves, and yield is about 85%.
Performance indications are as follows：
Water absorbing properties：175.5 g/g；
Liquidity limit dyestuff performance：CS/AMPS hydrogels are respectively 1789.8 to MB, CV and MG adsorbance,
3423.5 and 1271.0 mg/g.
Claims (3)
1. the preparation method of chitosan/2- acrylamide-2-methylpro panesulfonic acid hydrogels, it is with chitosan, 2- acrylamides
Base -2- methyl propane sulfonic acids are raw material, and N, N'- methylene-bisacrylamides are crosslinking agent, are directly handed in water solution system
Connection reacts and obtained；It is specially：First chitosan is dispersed with stirring in water, adds 2- acrylamide-2-methylpro panesulfonic acids
And N, N'- methylene-bisacrylamide, it is dispersed with stirring solution and milky occurs；Then 30 ~ 180 min are stirred at 60 ~ 80 DEG C；
Cooled product obtains milky jelly shaped polymer to room temperature；Shred, being neutralized with NaOH makes degree of neutralization up to 40% ~ 90%, then will production
Thing distills water washing to remove unreacted monomer, is then washed, dry, pulverize with absolute ethyl alcohol, crosses 100 mesh sieves, obtains
Chitosan/2- acrylamide-2-methylpro panesulfonic acid hydrogel products；
The mass ratio of chitosan and 2- acrylamide-2-methylpro panesulfonic acids is 1:6~1:20；
The dosage of crosslinking agent is 0.02 ~ 0.16 times of chitosan mass.
2. the preparation method of chitosan as claimed in claim 1/2- acrylamide-2-methylpro panesulfonic acid hydrogels, its feature
It is：In water solution system, the quality of water is 20 ~ 70 times of chitosan mass.
3. the preparation method of chitosan as claimed in claim 1/2- acrylamide-2-methylpro panesulfonic acid hydrogels, its feature
It is：Drying is in 40 ~ 70 DEG C of drying.
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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 |
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| CN108360072B (en) * | 2018-02-25 | 2020-03-10 | 温岭汉德高分子科技有限公司 | Monocrystalline silicon texturing additive based on chitosan-poly 2-acrylamide-2-methyl sodium propanesulfonate copolymer |
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