CN101531745A - Preparation of plural gel water absorbent material composed of silk fibroin/acrylic acid/acrylamide - Google Patents
Preparation of plural gel water absorbent material composed of silk fibroin/acrylic acid/acrylamide Download PDFInfo
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- CN101531745A CN101531745A CN200910097388A CN200910097388A CN101531745A CN 101531745 A CN101531745 A CN 101531745A CN 200910097388 A CN200910097388 A CN 200910097388A CN 200910097388 A CN200910097388 A CN 200910097388A CN 101531745 A CN101531745 A CN 101531745A
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- acrylic acid
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- silk fibroin
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- absorbent material
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Abstract
The invention discloses a method for preparing plural gel water absorbent material composed of silk fibroin/acrylic acid/acrylamide, comprising the following steps: dropping NaOH solution and acrylamide solids into analytical pure acrylic acid solution to obtain mixed solution of acrylic acid/acrylamide monomer after stirring; heating silk fibroin solution water bath, then adding initiating agent ammonium persulfate and the mixed solution of acrylic acid/acrylamide monomer, finally adding a cross linker N, N'-dimethyl bisacrylamide; heating and stirring to form gel, taking out the gel after standing, washing the gel by deionized water to obtain the plural gel water absorbent material composed of silk fibroin/acrylic acid/acrylamide. The material of the invention has not only hydrophile hygroscopicity but also biodegradability.
Description
Technical field
The present invention relates to the processing and utilization field of silk fibroin, the preparation method of particularly a kind of silk fibroin of water-absorbing-retaining purposes/acrylic acid plural gel water absorbent material.
Background technology
Silk fibroin (Silk Fibroin:SF) is a kind of natural structure albumen, form by crystallizing field and noncrystalline domain, because of its specific molecule structure has hydrophilic water absorbability, biological degradability, mechanics extension property etc., be good water-absorbing material base material, can in useless silk cocoon silk, extract preparation.
Vinylformic acid (acrylic acid:AA) is a kind of colourless liquid, water soluble, ethanol and ether etc.Be applied to fields such as building, papermaking, leather, weaving, daily-use chemical industry, water treatment with resin, synthetic rubber latex etc.Polypropylene and acrylic copolymer with vinylformic acid is produced are used as dispersion agent, flocculation agent and thickening material etc., are applied to High hydrophilous resin and help washing composition.
Acrylamide (Acrylamide:AM) is a kind of white crystalline solid, soluble in water, methyl alcohol and ethanol etc.Be mainly used in the synthetic of resin, tamanori etc., be applied to build, improve the soil, paint, papermaking and clothes processing etc.Also be used for daily lifes such as the starch food handled through high temperature process and tap water.
Attach great importance to the high-absorbent material that exploitation has biodegradability both at home and abroad.
At present, though widely used synthetic family macromolecule water-absorbing material water absorbent rate height is difficult for degraded, use easily contaminate environment of back.The natural polymer subclass water-absorbing material of exploitation has starch based, cellulose family, marine alga acids, polylactic acid-based etc., has certain biological degradability, but in material source, preparation tooling cost and to use the back that the influence of Soil structure etc. is existed not enough.Protein-based water-absorbing material is developed less except that gelatin, feather etc. at present.Silk fibroin possess hydrophilic property and biological degradability, raw material sources are extensive, extract easy to preparely, are a kind of good water-absorbing material base materials.Therefore, be raw material with useless silk etc., utilize the gel property and the water absorbing properties of fibroin, compound with organic polymer, it is good to develop a kind of water absorbing properties, has the novel high polymer water-absorbing material of biodegradable performance.For enriching the water-absorbing material type, expand the fibroin purposes, a developing direction that makes the silk fibroin utilization become high-absorbent material research application has than significance and using value.
The aquagel state water-absorbing material is to be different from beyond the form of solid water-absorbing material, can promptly make promptly use, advantage easy to use, be applicable to the i.e. property used soil water-retaining and coating etc.
Summary of the invention
At the deficiencies in the prior art part, the purpose of this invention is to provide a kind of method for preparing silk fibroin/acrylic acid plural gel water absorbent material, may further comprise the steps:
(1) certain mass analytical pure acrylic acid solution is joined in the beaker, at ambient temperature, the weight percent concentration that drips certain mass is 10% NaOH solution, makes acrylic acid degree of neutralization reach 70～80%; Add certain mass analytical pure acrylamide solids again, making acrylamide and acrylic acid massfraction ratio is 33%～51%.Obtain the monomeric mixing solutions of acrylic acid after the stirring;
(2) be 25%～50% by silk fibroin and the monomeric massfraction ratio of acrylic acid: with weight percent concentration is that 8% silk fibroin protein solution adds in the reactor, place and carry out 60～80 ℃ of heating in water bath on the constant temperature blender with magnetic force, add ammonium persulphate then as initiator, add the acrylic acid monomer mixed solution again, add N at last, N '-dimethyl bisacrylamide is as linking agent; Continue 60～80 ℃ of control bath temperatures, heat while stirring, when reactant becomes gel, the thickness that becomes stops to stir to stirring at need, leaves standstill then, stirs and standing and reacting time 2h altogether;
(3) gel after will leaving standstill takes out, and after the deionized water washing, obtains silk fibroin/acrylic acid plural gel water absorbent material.
The described room temperature of step (1) is 20～30 ℃.
The described degree of neutralization of step (1) is a mole degree of neutralization.
The preparation method of silk fibroin protein solution in the step (2): with the silkworm piques silk of cleaning, through Na
2CO
3After boiling water comes unstuck, with weight percent 50% CaCl
298 ℃ of dissolvings of solution are filtered, dialyse, are concentrated, and obtain silk fibroin protein solution.
Initiator ammonium persulfate is 1.8～2.5% with the monomeric massfraction ratio of acrylic acid in the step (2).
Linking agent N in the step (2), N '-dimethyl bisacrylamide is 0.15～0.3% with the monomeric massfraction ratio of acrylic acid.
Advantage of the present invention:
1, with silk fibroin (SF) and vinylformic acid (AA), the compound water-absorbing-retaining engineering water-absorbing material of making of acrylamide (AM), utilize the hydrophilic water absorbability of silk fibroin on the one hand, expand the source purposes of water-absorbing material, on the other hand because silk fibroin has biological degradability, can induce the decomposition of compound synthetic macromolecule, reduce environmental pollution.
2, silk fibroin/acrylic acid (SF/AA/AM) plural gel water absorbent material of the present invention preparation combines three's premium properties, has complementary advantages, and be a kind of novel biodegradable water-absorbing-retaining material.
3, silk fibroin (SF) water regain is 0.3～50g/g, and the SF/AA/AM plural gel water absorbent material of the present invention's preparation, water regain is 500～800g/g.
Embodiment
The present invention is further described by the following examples:
The preparation of silk fibroin protein solution:
With the silkworm piques silk of cleaning, through Na
2CO
3After boiling water comes unstuck, be 50%CaCl with weight percent concentration
298 ℃ of dissolvings of solution are filtered, dialyse, are concentrated, and obtain SF solution, and concentration is 8%, and is standby.
Embodiment 1:
(1) takes by weighing 2.65g analytical pure AA solution and add in the beaker, under 20～30 ℃ of room temperature conditions, drip 1.03g 10% (w/w) NaOH solution, make the degree of neutralization of AA reach 70%; Add 1.35g analytical pure AM solids again, obtain the mixing solutions of monomer (AA/AM) after the stirring.
(2) 2g SF is added in the reactor of 25ml distilled water, place and carry out heating in water bath (70 ℃) on the constant temperature blender with magnetic force; Add 0.072g ammonium persulphate (being called for short APS) then, add monomer (AA/AM) mixed solution and 0.006g N again, N '-dimethyl bisacrylamide (being called for short MBA).
(3) 70 ℃ of bath temperatures of control heat while stirring, and when reactant becomes gel, the thickness that becomes stops to stir to stirring at need, leaves standstill then, stir and standing and reacting time 2h altogether.
(4) gel that makes is taken out, after the deionized water washing, obtain the gluey composite absorbent material of water-setting.
(5) with the gluey composite absorbent material of water-setting, after the pelletizing, put into the 7000ml deionized water, leave standstill and soak 12h, make abundant suction saturated.
(6) take out the water-swelling gelatinous material, put to hang not have through 2h and only drip.Claim that then meter hydrogel weight is 5210g.
(7) again after 100 ℃ of dryings, claim that the meter dry weight is 6.77g.
(8) calculate water regain as follows:
Water regain=water absorbent gel weight-dry weight/dry weight
Composite absorbent material water regain=5210-6.77/6.77=768.6g/g
The water regain of the plural gel water absorbent material that this embodiment developed is 768.6g/g.
Embodiment 2:
(1) takes by weighing 2.65g AA solution and add in the beaker, under 20～30 ℃ of room temperature conditions, drip 1.177g10% (w/w) NaOH solution, make the degree of neutralization of AA reach 80%; Add 1.35g AM solids again, obtain the mixing solutions of monomer (AA/AM) after the stirring.
(2) 2g SF is added in the reactor of 25ml distilled water, place and carry out heating in water bath (80 ℃) on the constant temperature blender with magnetic force; Add 0.1g ammonium persulphate (being called for short APS) then, add monomer (AA/AM) mixed solution and 0.012g N again, N '-dimethyl bisacrylamide (being called for short MBA).
(3) 80 ℃ of bath temperatures of control heat while stirring, and when reactant becomes gel, the thickness that becomes stops to stir to stirring at need, leaves standstill then, stir and standing and reacting time 2h altogether.
(4) gel that makes is taken out, after the deionized water washing, obtain the gluey composite absorbent material of water-setting.
(5) with the gluey composite absorbent material of water-setting, after the pelletizing, put into the 7000ml deionized water, leave standstill and soak 12h, make abundant suction saturated.
(6) take out the water-swelling gelatinous material, put to hang not have through 2h and only drip.Claim that meter hydrogel weight is 3520g.
(7) again after 100 ℃ of dryings, the acquisition dry weight is 6.95g.
(8) calculate water regain as follows:
Water regain=water absorbent gel weight-dry weight/dry weight
Composite absorbent material water regain=3520-6.95/6.95=505.5g/g
The water regain of the plural gel water absorbent material that this embodiment developed is 505.5g/g.
Embodiment 3:
(1) takes by weighing 2.65g AA solution and add in the beaker, under 20～30 ℃ of room temperature conditions, drip 1.03g10% (w/w) NaOH solution, make the degree of neutralization of AA reach 70%; Add 1.35g AM solids again, obtain the mixing solutions of monomer (AA/AM) after the stirring.
(2) 2g SF is added in the reactor of 25ml distilled water, place and carry out heating in water bath (70 ℃) on the constant temperature blender with magnetic force; Add 0.08g ammonium persulphate (being called for short APS) then, add monomer (AA/AM) mixed solution and 0.008g N again, N '-dimethyl bisacrylamide (being called for short MBA).
(3) 70 ℃ of bath temperatures of control heat while stirring, and when reactant becomes gel, the thickness that becomes stops to stir to stirring at need, leaves standstill then, stir and standing and reacting time 2h altogether.
(4) gel that makes is taken out, after the deionized water washing, obtain the gluey composite absorbent material of water-setting.
(5) with the gluey composite absorbent material of water-setting, after the pelletizing, put into the 7000ml deionized water, leave standstill and soak 12h, make abundant suction saturated.
(6) take out the water-swelling gelatinous material, put to hang not have through 2h and only drip.Claim that meter hydrogel weight is 4500g.
(7) again after 100 ℃ of dryings, claim that the meter dry weight is 6.85g.
(8) calculate water regain as follows:
Water regain=water absorbent gel weight-dry weight/dry weight
Composite absorbent material water regain=4500-6.85/6.85=655.4g/g
The water regain of the plural gel water absorbent material that this embodiment developed is 655.4g/g.
Embodiment 4:
(1) takes by weighing 2.65g AA solution and add in the beaker, under 20～30 ℃ of room temperature conditions, drip 1.03g 10% (w/w) NaOH solution, make the degree of neutralization of AA reach 70%; Add 1.35g AM solids again, obtain the mixing solutions of monomer (AA/AM) after the stirring.
(2) 1g SF is added in the reactor of 25ml distilled water, place and carry out heating in water bath (60 ℃) on the constant temperature blender with magnetic force; Add 0.072g ammonium persulphate (being called for short APS) then, add monomer (AA/AM) mixed solution and 0.0072g N again, N '-dimethyl bisacrylamide (being called for short MBA).
(3) 60 ℃ of bath temperatures of control heat while stirring, and when reactant becomes gel, the thickness that becomes stops to stir to stirring at need, leaves standstill then, stir and standing and reacting time 2h altogether.
(4) gel that makes is taken out, after the deionized water washing, obtain the gluey composite absorbent material of water-setting.
(5) with the gluey composite absorbent material of water-setting, after the pelletizing, put into the 7000ml deionized water, leave standstill and soak 12h, make abundant suction saturated.
(6) take out the water-swelling gelatinous material, put to hang not have through 2h and only drip.Claim that meter hydrogel weight is 3600g.
(7) again after 100 ℃ of dryings, the acquisition dry weight is 6.63g.
(8) calculate water regain as follows:
Water regain=water absorbent gel weight-dry weight/dry weight
Composite absorbent material water regain=3600-6.63/6.63=542g/g
The water regain of the plural gel water absorbent material that this embodiment developed is 542g/g.
Embodiment 5:
(1) takes by weighing 3g AA solution and add in the beaker, under 20～30 ℃ of room temperature conditions, drip 1.03g10% (w/w) NaOH solution, make the degree of neutralization of AA reach 70%; Add 1g AM solids again, obtain the mixing solutions of monomer (AA/AM) after the stirring.
(2) 2g SF is added in the reactor of 25ml distilled water, place and carry out heating in water bath (80 ℃) on the constant temperature blender with magnetic force; Add 0.09g ammonium persulphate (being called for short APS) then, add monomer (AA/AM) mixed solution and 0.006g N again, N '-dimethyl bisacrylamide (being called for short MBA).
(3) 80 ℃ of bath temperatures of control heat while stirring, and when reactant becomes gel, the thickness that becomes stops to stir to stirring at need, leaves standstill then, stir and standing and reacting time 2h altogether.
(4) gel that makes is taken out, after the deionized water washing, obtain the gluey composite absorbent material of water-setting.
(5) with the gluey composite absorbent material of water-setting, after the pelletizing, put into the 7000ml deionized water, leave standstill and soak 12h, make abundant suction saturated.
(6) take out the water-swelling gelatinous material, put to hang not have through 2h and only drip.Claim that meter hydrogel weight is 4350g.
(7) again after 100 ℃ of dryings, the acquisition dry weight is 5.8g.
(8) calculate water regain as follows:
Water regain=water absorbent gel weight-dry weight/dry weight
Composite absorbent material water regain=4350-5.8/5.8=749g/g
The water regain of the plural gel water absorbent material that this embodiment developed is 749g/g.
At last, it is also to be noted that what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above examples of implementation, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (6)
1, a kind of method for preparing silk fibroin/acrylic acid plural gel water absorbent material, its feature may further comprise the steps:
(1) certain mass analytical pure acrylic acid solution is joined in the beaker, at ambient temperature, the weight percent concentration that drips certain mass is 10% NaOH solution, makes acrylic acid degree of neutralization reach 70～80%; Add certain mass analytical pure acrylamide solids again, making acrylamide and acrylic acid massfraction ratio is 33%～51%.Obtain the monomeric mixing solutions of acrylic acid after the stirring;
(2) be 25%～50% by silk fibroin and the monomeric massfraction ratio of acrylic acid: with weight percent concentration is that 8% silk fibroin protein solution adds in the reactor, place and carry out 60～80 ℃ of heating in water bath on the constant temperature blender with magnetic force, add ammonium persulphate then as initiator, add the acrylic acid monomer mixed solution again, add N at last, N '-dimethyl bisacrylamide is as linking agent; Continue 60～80 ℃ of control bath temperatures, heat while stirring, when reactant becomes gel, the thickness that becomes stops to stir to stirring at need, leaves standstill then, stirs and standing and reacting time 2h altogether;
(3) gel after will leaving standstill takes out, and after the deionized water washing, obtains silk fibroin/acrylic acid plural gel water absorbent material.
2, method according to claim 1 is characterized in that: the described room temperature of step (1) is 20～30 ℃.
3, method according to claim 1 is characterized in that: the described degree of neutralization of step (1) is a mole degree of neutralization.
4, method according to claim 1, the preparation method who it is characterized in that silk fibroin protein solution in the step (2): with the silkworm piques silk of cleaning, after Na2CO3 boiling water comes unstuck, with weight percent 98 ℃ of dissolvings of CaCl2 solution of 50%, filter, dialyse, concentrate, obtain silk fibroin protein solution.
5, method according to claim 1 is characterized in that: initiator ammonium persulfate is 1.8～2.5% with the monomeric massfraction ratio of acrylic acid in the step (2).
6, method according to claim 1 is characterized in that: linking agent N in the step (2), N '-dimethyl bisacrylamide is 0.15～0.3% with the monomeric massfraction ratio of acrylic acid.
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