CN103709328A - Preparation method of hemicelluloses-based organic-inorganic compound hydrogel - Google Patents
Preparation method of hemicelluloses-based organic-inorganic compound hydrogel Download PDFInfo
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Abstract
The invention discloses a preparation method of hemicelluloses-based organic-inorganic compound hydrogel, the preparation method includes the following steps: mixing hemicellulose with water in a reactor, and then heating to 80 -90 DEG C for reaction to obtain a mixed liquid; adding montmorillonite to the mixed liquid, stirring under nitrogen atmosphere to produce a viscous solution, and cooling; when the viscous solution temperature is dropped to 68-75 DEG C, adding potassium persulfate for reacting for 5-15 min, then respectively adding acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and N, N-methyl acrylamide for reacting for4 hours to obtain a primary hydrogel product; putting the primary hydrogel product in an excess ethanol solution for dehydration; and then drying the dehydrated primary hydrogel product at 60-80 DEG C to obtain the hemicelluloses-based organic-inorganic compound hydrogel, and the preparation method is low in cost, simple in technique, and easy to put into industrial production.
Description
Technical field
The present invention relates to a kind of preparation method of composite aquogel, particularly relate to a kind of preparation method of hemicellulose base organic-inorganic composite aquogel.
Background technology
Gel is a kind of polymkeric substance with tridimensional network, and it mainly forms by covalent linkage, hydrogen bond, Van der Waals force or physical connection effect are crosslinked.Hydrogel is comprised of an elastic cross-linked network of tool and because its main component has certain solvability.It is a kind ofly to have wetting ability but water-fast high molecular polymer.They can be swelling to rapidly balance volume and still can keep its shape in water, and the deswelling that dewaters under certain conditions, are a class set water suction, water conservation, slowly-releasing is in one and develop functional high molecule material rapidly.Because of water suction, water conservation and the bionical characteristic of its uniqueness, hydrogel is widely used in the fields such as industry, agricultural, medicine and biological engineering material.
Along with the Nonrenewable resources total amounts such as oil, coal reduce increasingly, by biological renewable resources, transforming acquisition novel material, the high-valued energy, industrial chemicals and medicine is just becoming a kind of new development trend, and hemicellulose becomes an important branch in biological renewable resources utilization research.The content of hemicellulose in plant resources is only second to Mierocrystalline cellulose, is a kind of inexhaustible, nexhaustible reproducibility plant resources.The content of hemicellulose accounts for 1/4～1/3 in plant resources, and in different floristics, hemicellulose level also can be different, as hemicellulose level in Maize Stem accounts for 28.0%, in Herba Hordei Vulgaris, account for 34.9%, in wheat straw, account for 38.8%, in straw, account for 35.8%, in rye grass, account for 36.9%.The novel material that this relatively high hemicellulose level makes them can be used as industrial copolymer replaces environmentally harmful petroleum chemicals.
Hemicellulose as one of plant biomass three large components, although be one of renewable resources the abundantest on the earth, complicacy and diversity due to its structure, fail to be fully utilized always, as in paper industry, most hemicellulose is removed and can only discharges as waste liquid in pulping process, causes great waste.On hemicellulose molecule chain, contain a large amount of hydrophilic radicals, be expected to become the important source material of synthetic water gel.Hemicellulose based aquagel has the advantages such as raw material is renewable, product degraded by environment, and can be by efficiently utilizing biorefinery by product to reduce bioenergy.Therefore, effectively biomass half cellulose conversion is become to the degradable polymer of high added value, to realizing industrial or agricultural Sustainable Healthy Development, there is positive meaning.
Summary of the invention
The object of the invention is to propose a kind of preparation method of hemicellulose base organic-inorganic composite aquogel.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme: a kind of preparation method of hemicellulose base organic-inorganic composite aquogel, said method comprising the steps of:
Step 1 is mixed with 35 weight parts waters 1～5 weight part hemicellulose in reactor, is then heated to 80 ℃～90 ℃ reactions and obtains mixed solution;
Step 2 adds 0～0.12 weight part polynite in described mixed solution, stirs and forms thick solution, cooling under nitrogen atmosphere;
Step 3, when thick solution temperature is down to 68～75 ℃, add 0.05～0.1 weight part Potassium Persulphate reaction 5～15min, then add respectively 1.43～2.86 parts by weight of acrylic acid, 1.14～2.57 weight part 2-allylamine-2-methyl propane sulfonic acids, 0.05～0.25 weight part N, N-methylene radical acrylamide, react 4 hours, obtain primary water jel product;
Step 4, puts into excessive ethanolic soln by primary water jel product, dewaters; Then the primary water jel product after dehydration is dry at 60 ℃～80 ℃, obtain hemicellulose base organic-inorganic composite aquogel.During lower than this temperature, hydrogel will be difficult to be dried, the easy sex change of hydrogel during higher than this temperature.
Preferably, in the preparation method of hemicellulose base organic-inorganic composite aquogel as above, step 2 to the polynite that adds 0.06～0.10 weight part in described mixed solution, stirs and forms thick solution under nitrogen atmosphere.
Preferably, in the preparation method of hemicellulose base organic-inorganic composite aquogel as above, step 3, according to its chemical principle and gel-strength, water-absorbent, consider and determine three's weight part proportioning, add 1.5～2 parts by weight of acrylic acid, 1.6～2 weight part 2-allylamine-2-methyl propane sulfonic acids, 0.1～0.2 weight part N, N-methylene radical acrylamide.
Preferably, in the preparation method of hemicellulose base organic-inorganic composite aquogel as above, the dewatering time of step 4 is 24～48 hours.
Preferably, in the preparation method of hemicellulose base organic-inorganic composite aquogel as above, described hemicellulose is bamboo wood hemicellulose, Technique of Hemicellulose from Cornstalk or Triploid of Populus Tomentosa hemicellulose.
Initiator potassium persulfate (KPS) by hemicellulose with cause producing free radical, then with vinylformic acid and the graft copolymerization of 2-acrylamide-2-methyl propane sulfonic acid, and at linking agent N, under N-methylene radical acrylamide (MBA) condition, be cross-linked to form network structure.Finally, polynite (MMT) cuttage is formed to hydrogel in three-dimensional network.
Compared with prior art, beneficial effect of the present invention is:
1, the method is with low cost, technique is simple, be easy to drop into industrial production.
2,, by two-step reaction, elder generation by after hemicellulose and monomer vinylformic acid (AA) and 2-allylamine-2-methyl propane sulfonic acid (AMPS) combination, forms three-dimensional net structure with inorganic clay-polynite (MMT) with graft copolymerization.
3, by changing the consumption of reactant, can obtain the hydrogel of different swelling behaviors.
4, the organic-inorganic composition hydrogel of hemicellulose group has different swelling properties in different solution.
Accompanying drawing explanation
Fig. 1 is hemicellulose base organic-inorganic composite aquogel preparation principle figure of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but not as a limitation of the invention.
Embodiment 1
Prepare embodiment 1 hemicellulose used, i.e. bamboo wood hemicellulose.
The mao bamboon powder of grinding is first used to toluene-ethanol (2:1, v/v) extracting 6h in Soxhlet extractor.Then residual substance and Textone are added to the water at 78 ℃ of heating 2h, with acetic acid adjust pH to 3.8～4.0, obtain the mao bamboon of delignification.The NaOH that is 3wt% by concentration is at 60 ℃ of extracting 4h, and the amount ratio of the mao bamboon of delignification and NaOH solution is 1:25gml
-1.The filtrate obtaining is with 6mol/l hydrochloric acid adjust pH to 5.5～6.0, then concentrated, dialysis, and after reconcentration, lyophilize, obtains hemicellulose.
Step 1 is mixed with 35g water 1g hemicellulose in tri-mouthfuls of reaction flasks of 50ml, is then heated to 90 ℃, and in nitrogen atmosphere, stirs acquisition mixed solution;
Step 2 adds 0.12g polynite (MMT) in described mixed solution, stirs and forms thick solution, cooling under nitrogen atmosphere;
Step 3, when thick solution temperature is down to 68 ℃, add 0.1g Potassium Persulphate (KPS) reaction 10～12min, then add respectively 1.43g vinylformic acid (AA), 1.16g2-allylamine-2-methyl propane sulfonic acid (AMPS), 0.05g N, N-methylene radical acrylamide (MBA), react 4 hours, obtain primary water jel product;
Step 4, puts into primary water jel product ethanol (volumetric concentration 65%) solution of 3～5 times of volumes, and 30h dewaters; Then the primary water jel product after dehydration is dry at 60 ℃, obtain hemicellulose base organic-inorganic composite aquogel.
Performance test: by the hydrogel of embodiment 1 gained put into respectively pH value for 2-12(gradient be 1) solution, the swelling property of hydrogel first increases rear minimizing, swelling ratio is up to 1000gg
-1(pH=8).Hydrogel has different swelling properties under different pH, illustrates that hydrogel has pH responsiveness, can be applicable to medicament slow release field.
Embodiment 2
Prepare embodiment 2 Technique of Hemicellulose from Cornstalk used.
The maize straw powder of grinding is first used to toluene-ethanol (2:1, v/v) extracting 6h in Soxhlet extractor.Then residual substance and Textone are added to the water at 78 ℃ of heating 2h, with acetic acid adjust pH to 3.8～4.0, obtain the maize straw of delignification.The NaOH that is 3wt% by concentration is at 60 ℃ of extracting 4h, and the amount ratio of the mao bamboon of delignification and NaOH solution is 1:25gml
-1.The filtrate obtaining is with 6mol/l hydrochloric acid adjust pH to 5.5～6.0, then concentrated, dialysis, and after reconcentration, lyophilize, obtains hemicellulose.
Step 1 is mixed with 35g water 4g hemicellulose in tri-mouthfuls of reaction flasks of 50ml, is then heated to 80 ℃, and in nitrogen atmosphere, stirs acquisition mixed solution;
Step 2 adds 0.1g polynite (MMT) in described mixed solution, stirs and forms thick solution, cooling under nitrogen atmosphere;
Step 3, when thick solution temperature is down to 70 ℃, add 0.08g Potassium Persulphate (KPS) reaction 5～15min, then add respectively 2g vinylformic acid (AA), 2g2-allylamine-2-methyl propane sulfonic acid (AMPS), 0.15g N, N-methylene radical acrylamide (MBA), react 4 hours, obtain primary water jel product;
Step 4, puts into excessive ethanol (volumetric concentration 65%) solution by primary water jel product, and 24h dewaters; Then the primary water jel product after dehydration is dry at 72 ℃, obtain hemicellulose base organic-inorganic composite aquogel.
Performance test: the LiCl, the CaCl that the hydrogel of embodiment 2 gained are put into respectively to 0.05-0.25%
2and FeCl
3in solution, the swelling property of hydrogel in salts solution successively: LiCl>CaCl
2>FeCl
3.Solution middle-jiao yang, function of the spleen and stomach ionic valence electricity is higher, and the swelling property of hydrogel is lower.
Embodiment 3
Prepare embodiment 3 Triploid of Populus Tomentosa hemicellulose used.
The Triploid of Populus Tomentosa powder of grinding is first used to toluene-ethanol (2:1, v/v) extracting 6h in Soxhlet extractor.Then residual substance and Textone are added to the water at 78 ℃ of heating 2h, with acetic acid adjust pH to 3.8～4.0, obtain the Triploid of Populus Tomentosa of delignification.The NaOH that is 3wt% by concentration is at 60 ℃ of extracting 4h, and the amount ratio of the mao bamboon of delignification and NaOH solution is 1:25gml
-1.The filtrate obtaining is with 6mol/l hydrochloric acid adjust pH to 5.5～6.0, then concentrated, dialysis, and after reconcentration, lyophilize, obtains Triploid of Populus Tomentosa hemicellulose.
Step 1 is mixed with 35g water 5g hemicellulose in tri-mouthfuls of reaction flasks of 50ml, is then heated to 83 ℃, and in nitrogen atmosphere, stirs acquisition mixed solution; And under nitrogen atmosphere, stir the thick solution of formation, lower the temperature;
Step 2, when thick solution temperature is down to 75 ℃, add 0.06g Potassium Persulphate (KPS) reaction 10min, then add respectively 2.86g vinylformic acid (AA), 2.5g2-allylamine-2-methyl propane sulfonic acid (AMPS), 0.2g N, N-methylene radical acrylamide (MBA), react 4 hours, obtain primary water jel product;
Step 3, puts into excessive ethanol (volumetric concentration 65%) solution by primary water jel product, and 48h dewaters; Then the primary water jel product after dehydration is dry at 80 ℃, obtain hemicellulose base organic-inorganic composite aquogel.
Performance test: the hydrogel of embodiment 3 gained is put into water, and in different time, swelling property is different.After 30s, swelling property forms rapidly and reduces, and finally tends to balance.
Above embodiment is only exemplary embodiment of the present invention, is not used in restriction the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can make various modifications or be equal to replacement the present invention in essence of the present invention and protection domain, this modification or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (5)
1. a preparation method for hemicellulose base organic-inorganic composite aquogel, said method comprising the steps of:
Step 1 is mixed with 35 weight parts waters 1～5 weight part hemicellulose in reactor, is then heated to 80 ℃～90 ℃ reactions and obtains mixed solution;
Step 2 adds 0～0.12 weight part polynite in described mixed solution, stirs and forms thick solution, cooling under nitrogen atmosphere;
Step 3, when thick solution temperature is down to 68～75 ℃, add 0.05～0.1 weight part Potassium Persulphate reaction 5～15min, then add respectively 1.43～2.86 parts by weight of acrylic acid, 1.14～2.57 weight part 2-allylamine-2-methyl propane sulfonic acids, 0.05～0.25 weight part N, N-methylene radical acrylamide, react 4 hours, obtain primary water jel product;
Step 4, puts into excessive ethanolic soln by primary water jel product, dewaters; Then the primary water jel product after dehydration is dry at 60 ℃～80 ℃, obtain hemicellulose base organic-inorganic composite aquogel.
2. the preparation method of hemicellulose base organic-inorganic composite aquogel according to claim 1, is characterized in that, step 2, to the polynite that adds 0.06～0.10 weight part in described mixed solution, stirs and forms thick solution under nitrogen atmosphere.
3. the preparation method of hemicellulose base organic-inorganic composite aquogel according to claim 1, it is characterized in that, in step 3, add 1.5～2 parts by weight of acrylic acid, 1.6～2 weight part 2-allylamine-2-methyl propane sulfonic acids, 0.1～0.2 weight part N, N-methylene radical acrylamide.
4. the preparation method of hemicellulose base organic-inorganic composite aquogel according to claim 1, is characterized in that, the dewatering time in step 4 is 24～48 hours.
5. the preparation method of hemicellulose base organic-inorganic composite aquogel according to claim 1, is characterized in that, described hemicellulose is bamboo wood hemicellulose, Technique of Hemicellulose from Cornstalk or Triploid of Populus Tomentosa hemicellulose.
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| CN104710583A (en) * | 2015-02-15 | 2015-06-17 | 青岛大学 | Preparation method for high-strength hydrogel |
| CN105131185A (en) * | 2015-09-17 | 2015-12-09 | 华南理工大学 | Pineapple waste hemicellulose based pH sensitive type porous hydrogel as well as preparation method and application thereof |
| CN105315410A (en) * | 2014-08-03 | 2016-02-10 | 浙江理工大学 | Method for preparing temperature/pH sensitive hydrogel by using bamboo dissolving pulp |
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| CN105315410A (en) * | 2014-08-03 | 2016-02-10 | 浙江理工大学 | Method for preparing temperature/pH sensitive hydrogel by using bamboo dissolving pulp |
| CN105315410B (en) * | 2014-08-03 | 2018-02-09 | 浙江理工大学 | The method that one kind utilizes bamboo dissolving pulp preparation temperature/pH sensitive hydrogels |
| CN104710583A (en) * | 2015-02-15 | 2015-06-17 | 青岛大学 | Preparation method for high-strength hydrogel |
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| CN105131185A (en) * | 2015-09-17 | 2015-12-09 | 华南理工大学 | Pineapple waste hemicellulose based pH sensitive type porous hydrogel as well as preparation method and application thereof |
| CN105618006A (en) * | 2015-12-22 | 2016-06-01 | 成都新柯力化工科技有限公司 | Preparation method for straw hydrogel composite material special for sewage treatment |
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| CN106075791A (en) * | 2016-07-20 | 2016-11-09 | 周荣 | A kind of preparation method of polymolecularity aerosol extinguishing agent |
| CN107759735A (en) * | 2016-08-22 | 2018-03-06 | 华南理工大学 | A kind of water-insoluble hemicellulose grafted polyacrylamide and its preparation and application |
| CN107759735B (en) * | 2016-08-22 | 2020-07-28 | 华南理工大学 | Water-insoluble hemicellulose grafted polyacrylamide and preparation and application thereof |
| CN107552008A (en) * | 2017-09-12 | 2018-01-09 | 齐鲁工业大学 | A kind of method of corn cob fiber element based aquagel absorption heavy metal ion |
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