CN1314729C - Prepn process of copolymer of polyaspartic acid and chitosan - Google Patents
Prepn process of copolymer of polyaspartic acid and chitosan Download PDFInfo
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- CN1314729C CN1314729C CNB2005100150635A CN200510015063A CN1314729C CN 1314729 C CN1314729 C CN 1314729C CN B2005100150635 A CNB2005100150635 A CN B2005100150635A CN 200510015063 A CN200510015063 A CN 200510015063A CN 1314729 C CN1314729 C CN 1314729C
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Abstract
The present invention discloses a method for preparing the copolymer of polyaspartic acid and chitosan, which comprises: polyaspartic acid with amino side chains, and chitosan react in a crosslinking mode in an acid water solution; then, a product is precipitated and extracted by adding alkali, is washed by water, and is dried in a vacuum mode. The obtained product has the function of adsorbing heavy metal and certain organic matter. The obtained product can be used for eliminating heavy metal, chlorohydrocarbon, organic pigment, dye, etc., and can be widely applied to the fields of pharmaceutical industry, food engineering, printing and dyeing industry, sewage treatment, etc.
Description
[technical field]
The present invention relates to the fine chemicals field of chemical engineering, particularly a kind of method for preparing poly aspartic acid and chitin copolymer.
[background technology]
Chitin extensively is present in the crust of invertebrates (as shrimp, crab, insect), and in fungal cell wall and the plant cell wall.Chitosan is the deacetylated product of chitin, and it and cellulosic structural similitude are alkaline polysaccharides unique in the natural polysaccharide.Owing to contain a large amount of free amino (NH in its structure
2), some heavy metal ion are had stronger complexing adsorption.But-NH
2Can accept the proton salify, thus in acidic aqueous solution solubilized, therefore should manage it is carried out modification.
About the also existing report of the synthetic and application of poly aspartic acid material, see patent CN 1198444A, CN 1631517A.But institute's synthetic poly aspartic acid material has stronger water-absorbent mostly at present, and before and after the suction, the volume change of material is bigger, and this makes them be restricted in some applications.
[summary of the invention]
The objective of the invention is in order to satisfy the needs of application, and provide a kind of method for preparing poly aspartic acid and chitin copolymer, poly aspartic acid and chitosan that this method will have the amido side chain carry out crosslinking reaction in acidic aqueous solution, products therefrom has absorption heavy metal and some organic function, can be used for removing heavy metal, hydrochloric ether, pigment dyestuff, dyestuff etc.
The present invention addresses the above problem a kind of method for preparing poly aspartic acid and chitin copolymer that discloses.This method may further comprise the steps:
(1) polysuccinimide and polyamines are reacted, contained poly aspartic acid or its aqueous solution of the side chain of an amido at least; The mol ratio of polyamines and polysuccinimide (by the succimide unit): 0.10-0.50: 1;
(2) poly aspartic acid of the side chain that contains an amido at least that will obtain adds linking agent aliphatics or aromatic series dialdehyde again, makes mixed aqueous solution; The mol ratio of amido is in the poly aspartic acid of aldehyde radical in aliphatics or the aromatic series dialdehyde and band amido side chain: 0.01-1.0: 1;
(3) the preparation chitosan solution is dissolved in chitosan in the dilute acid soln, and the concentration of dilute acid soln is massfraction 1-2%, and the mass ratio of the diluted acid of chitosan and 1-2% is: 1: 1-1: 100;
Above-mentioned (2) that (4) will obtain, (3) two solution are 1 in the poly aspartic acid of band amido side chain and the mass ratio of chitosan: 99-99: mix under 1 the ratio, violent stirring, reaction mixture was reacted 0.1-10 hour under 20-100 ℃ of temperature again;
(5) afterwards under violent stirring, in mixing solutions, add alkali aqueous solution to pH2-7 in batches or progressively;
(6) isolate solid, and wash with water to washing lotion for neutral, get the lightpink particulate solid 25-60 ℃ of following vacuum-drying.
The invention has the beneficial effects as follows: the present invention's design is environmentally friendly with poly aspartic acid and these two of chitosans, and the material with widespread use combines, exploitation has the novel material of the two function concurrently, in the structure of products therefrom, contain amido, hydroxyl, carboxyl and amide group so simultaneously, make it have multiple function.Similar owing to poly aspartic acid/chitin copolymer in addition to peptidoglycan (containing amino acid, teichoic acid and the diamino acid) constitutional features of cell walls, so this multipolymer also can be considered bionical object height molecular material.The present invention is synthetic that poly aspartic acid and chitin copolymer have not only kept some application feature of poly aspartic acid and chitosan, and the swelling property of this multipolymer is little, and is little applicable to requiring material volume to change less swelling ratio) occasion.Can be used for removing heavy metal, hydrochloric ether, pigment dyestuff, dyestuff etc. and be widely used in medicine industry, food engineering, printing and dyeing industry, fields such as sewage disposal.
[embodiment]
The method for preparing poly aspartic acid and chitin copolymer.May further comprise the steps:
(1) polysuccinimide and polyamines are reacted, the reaction solvent for use can be organic solvent, for example dimethyl formamide; The reaction solvent for use also can be an inorganic solvent, or the mixed solvent of the two, preferably uses water medium, is contained poly aspartic acid or its aqueous solution of the side chain of an amido at least; The mol ratio of polyamines and polysuccinimide (by the succimide unit): 0.10-0.50: 1.Used polyamines can be one or both and the two or more mixing in diamines or triamine, the tetramine polyamines organic bases.Preferably use L-Methionin, hydrazine hydrate, quadrol, butanediamine etc., or have the polyamines (other amine that except that amido, also has the 3rd functional group) of second kind of functional group, be beneficial to continue functionization.Hybrid mode during the two reaction can be under agitation, the alkaline aqueous solution that will contain polyamines all or join in the suspension pulpous state liquid of polysuccinimide in water in batches or progressively and go, perhaps all or join in the polyamines solution in batches or progressively and go, with polysuccinimide or its suspension pulpous state aqueous solution or both and add.
(2) poly aspartic acid of the side chain that contains an amido at least that will obtain adds linking agent aliphatics or aromatic series dialdehyde again, makes mixed aqueous solution; The mol ratio of amido is in the poly aspartic acid of aldehyde radical in aliphatics or the aromatic series dialdehyde and band amido side chain: 0.01-1.0: 1; Aliphatics or aromatic series dialdehyde can be oxalic dialdehyde, mda, glutaraldehyde, terephthal aldehyde etc.
(3) the preparation chitosan solution is dissolved in chitosan in the dilute acid soln, and the concentration of dilute acid soln is massfraction 1-2%, and the mass ratio of the diluted acid of chitosan and 1-2% is: 1: 1-1: 100; Used dilute acid soln can be a dilute hydrochloric acid solution, acetum, or the mixture of the two.
Above-mentioned (2) that (4) will obtain, (3) two solution are 1 in the poly aspartic acid of band amido side chain and the mass ratio of chitosan: 99-99: mix under 1 the ratio, violent stirring; Again reaction mixture was reacted 0.1-10 hour under 20-100 ℃ of temperature.Its blending means be solution that (2) are obtained all or be added drop-wise in the solution that (3) obtain in batches or progressively and go, or the solution that will (3) obtains is whole or be added drop-wise in the solution that (2) obtain in batches or progressively and go, or two solution and adding.
(5) afterwards under violent stirring, in mixing solutions, add in batches or progressively alkali aqueous solution to pH less than 7, best pH2-6.Used alkali is sodium hydroxide or potassium hydroxide, and alkali concn is 1mol/L to 10mol/L.
(6) isolate solid, and wash with water to washing lotion for neutral, get the lightpink particulate solid 25-60 ℃ of following vacuum-drying.
The present invention can also prepare after the poly aspartic acid solution that has the amido side chain and (3) prepare chitosan solution in above-mentioned steps (1), add template among being increased in one of both solution or both solution, carry out subsequent operations then, finally make the resin that has template.Template is one or both and the two or more mixing in soluble calcium salt, magnesium salts, zinc salt, nickel salt, mantoquita, molysite, the manganese salt etc.; The mol ratio of template and polysuccinimide (by the succimide unit) is 0.1-1: 1.
If needed, the present invention can also carry out the stripper plate agent to the above-mentioned resin that has template.Among step (6) or afterwards promptly, increase and use the stripper plate agent: disodium edta, citric acid or Trisodium Citrate complexing agent, acetate and/or acetate carry out the stripper plate agent to the gained resin and operate.
It is soluble in water that step of the present invention (1) prepares the poly aspartic acid that has the amido side chain, and preferably in the deionized water, the poly aspartic acid of band amido side chain and the mass ratio of water are: 1: 99-99: 1.
The method of poly-day (door) winter propylhomoserin/chitin copolymer of the present invention's preparation comprises following several:
First kind: with an organic solvent, do not add poly-day (door) winter propylhomoserin/chitin copolymer of template preparation, this method comprises the following steps:
(1) preparation contains the poly aspartic acid of the side chain of an amido at least.Method is that polysuccinimide and polyamines or its hydrochloride are reacted in organic solvent (for example dimethyl formamide).The mol ratio of polyamines and polysuccinimide (by the succimide unit): 0.05-0.5: 1, temperature of reaction 20-100 ℃, the reaction times is 1-10 hour.After reaction finishes, add anhydrous methanol or dehydrated alcohol and separate out product, filter, filter cake obtains having the poly aspartic acid of amido side chain at 40-60 ℃ of following vacuum-drying 4h.
The raw material polysuccinimide can be with traditional thermal polycondensation method, for example by aspartic acid in catalysis or do not have that high temperature polymerization obtains under the catalytic condition, can be with reference to US 5,057,597, US 5,221,733, US5,319,145 etc.; Or by Malaysia (acid) acid anhydride (being MALEIC ANHYDRIDE, cis-butenedioic anhydride), toxilic acid or fumaric acid and derivative thereof earlier with can discharge NH
3Nitrogenous compound reaction, the polymerization of dewatering then can be with reference to US 4,839,461, US5,288,783, US5,610,267 etc.
(2) poly aspartic acid of the side chain that contains an amido at least that obtains in (1) is soluble in water, preferably in the deionized water, the poly aspartic acid of band amido side chain and the mass ratio of water are: 1: 99-99: 1;
(3) in above-mentioned solution, add the linking agent dialdehyde, mix.The mol ratio of amido: 0.01-1.0: 1 in the poly aspartic acid of aldehyde radical in the dialdehyde and band amido side chain; Described dialdehyde can be oxalic dialdehyde, aliphatic dialdehydes or aromatic series dialdehyde such as mda, glutaraldehyde;
(4) in addition chitosan is dissolved in the dilute acid soln.Described dilute acid soln can be a dilute hydrochloric acid solution, acetum, or the mixture of the two.The concentration of dilute acid soln is 1-2% (massfraction).The mass ratio of the diluted acid of chitosan and 1-2% is: 1: 1-1: 100;
(5) two solution that (3), (4) are obtained mix.The poly aspartic acid of band amido side chain and the mass ratio of chitosan are 1: 99-99: 1.
(6) hybrid mode can be under violent stirring, (3) all or in batches or progressively are added drop-wise in the solution that (4) obtain go, or (4) all or in batches or progressively be added drop-wise in the solution that (3) obtain go, or two solution and adding;
(7) reaction mixture that (6) are obtained reacts under 20-100 ℃ of temperature, reaction times 0.1-10 hour;
(8) afterwards under violent stirring, in mixing solutions, add alkali aqueous solution to pH2-7 in batches or progressively, used alkali is sodium hydroxide or potassium hydroxide, alkali concn is 1mol/L to 10mol/L;
(9) isolate solid, and wash with water to neutrality.Get the lightpink particulate solid 25-60 ℃ of following vacuum-drying.
Second kind: with an organic solvent, add poly-day (door) winter propylhomoserin/chitin copolymer of template preparation, this method comprises the following steps:
Basic step just adds template with first kind of embodiment in step (2) gained solution, carry out subsequent operations afterwards again.Template used dose is preferentially selected CaCl
2Or Ca (NO
3)
2, CaSO
4, ZnCl
2, MgCl
2, MgSO
4In one or both and two or more mixing, or other soluble nickel salt, mantoquita, molysite, manganese salt etc.The mol ratio of template and polysuccinimide (by the succimide unit) is 0.1-1: 1;
Also can in chitosan solution (4), add template.Or several template are joined in the chitosan solution (4), and other several template are joined in the solution (2) of poly aspartic acid of band amido side chain;
Need, also can carry out stripper plate agent operation to the gained resin, the agent of indication stripper plate is a disodium edta, citric acid or Trisodium Citrate complexing agent, acetate and/or acetate.
The third: use the water medium method, do not add poly-day (door) winter propylhomoserin/chitin copolymer of template preparation, this method comprises the following steps:
(1) preparation contains the poly aspartic acid aqueous solution of the side chain of an amido at least.Method is that polyamines or its salt that will contain two amidos at least are dissolved in the alkaliferous aqueous solution, and the mol ratio of polyamines and alkali is: 1: 9-9: 1; Then with gained solution by the mol ratio of polyamines with polysuccinimide (by the succimide unit): 0.05-0.5: 1 mixes, temperature of reaction 20-100 ℃, reaction times is 0.5-10 hour, if the words that need, can add a little alkali aqueous solutions to the imide ring in the polysuccinimide again and all open, generate the poly aspartic acid aqueous solution that has the amido side chain;
The hybrid mode of above-mentioned polyamines and polysuccinimide can be under agitation, with polyamines solution all or join in the suspension pulpous state liquid of polysuccinimide in water in batches or progressively and go, perhaps all or join in the polyamines solution in batches or progressively and go, with polysuccinimide or its suspension pulpous state aqueous solution or both and add;
(2) pH of the solution that (1) is obtained with hydrochloric acid soln transfers to below 7, preferably pH2-6;
(3) in above-mentioned solution, add the linking agent dialdehyde, mix.The mol ratio of amido: 0.01-1.0: 1 in the poly aspartic acid of aldehyde radical in the dialdehyde and band amido side chain; Make the aqueous solution of the two mixture;
(4) in addition chitosan is dissolved in the dilute acid soln.Described dilute acid soln can be a dilute hydrochloric acid solution, acetum, or the mixture of the two.The concentration of dilute acid soln is 1-2% (massfraction).The mass ratio of the diluted acid of chitosan and 1-2% is: 1: 1-1: 100;
(5) two solution that (3) (4) are obtained mix.The poly aspartic acid of band amido side chain and the mass ratio of chitosan are 1: 99-99: 1.
(6) hybrid mode can be under violent stirring, (3) all or in batches or progressively are added drop-wise in the solution that (4) obtain go, or (4) all or in batches or progressively be added drop-wise in the solution that (5) obtain go, or two solution and adding;
(7) reaction mixture that (6) are obtained reacts under 20-100 ℃ of temperature, reaction times 0.1-10 hour;
(8) afterwards under violent stirring, in mixing solutions, add alkali aqueous solution to pH2-7 in batches or progressively, used alkali is sodium hydroxide or potassium hydroxide, alkali concn is 1mol/L to 10mol/L;
(9) isolate solid, and wash with water to neutrality.Get the lightpink particulate solid 25-60 ℃ of following vacuum-drying.
The 4th kind: use the water medium method, add the method for poly-day (door) winter propylhomoserin/chitin copolymer of template preparation, this method comprises the following steps:
Basic step just adds template with the third mode in step (2) gained solution, carry out subsequent operations afterwards again.Template used dose is preferentially selected CaCl
2Or Ca (NO
3)
2, CaSO
4, ZnCl
2, MgCl
2, MgSO
4In one or both and two or more mixing, or other soluble nickel salt, mantoquita, molysite, manganese salt etc.The mol ratio of template and polysuccinimide (by the succimide unit) is 0.1-1: 1;
Also can in chitosan solution (4), add template, or several template are joined in the chitosan solution (4), and other several template be joined in the solution (2) of the poly aspartic acid of being with the amido side chain;
Need, also can carry out stripper plate agent operation to the gained resin, the agent of indication stripper plate is a disodium edta, citric acid or Trisodium Citrate complexing agent, acetate and/or acetate.
The 5th kind: use the water medium method, do not add poly-day (door) winter propylhomoserin/chitin copolymer of template preparation, this method comprises the following steps:
(1) preparation contains the poly aspartic acid aqueous solution of the side chain of an amido at least.Method is:
(a) under agitation polysuccinimide is added to the water, makes the suspension pulpous state aqueous solution of polysuccinimide.
(b) alkali aqueous solution of the polyamines of at least two amidos of preparation, the mol ratio of polyamines and alkali is 1: 9-9: 1; Used alkali is sodium hydroxide or potassium hydroxide, and alkali concn is 1mol/L to 10mol/L.
Above-mentioned polyamines can be one or both in the polyamines organic basess such as diamines or triamine, tetramine and two or more mixing.Said diamines or polyamines organic basess such as triamine, tetramine can be L-Methionin, hydrazine hydrate, quadrol, butanediamine.
(c) solution that obtains in (b) is added drop-wise in the solution that obtains in (a) in batches or progressively, finish until reaction, the mol ratio of polyamines and polysuccinimide (by the succimide unit) is: 0.1-0.5: 1, temperature of reaction is controlled at 20-100 ℃, can adopt common heating or microwave heating, the reaction times is 1-10 hour; The weight ratio of water and polysuccinimide is 2-20: 1.
(2) pH of the solution that (1) is obtained with hydrochloric acid soln transfers to below 7, preferably pH2-6;
(3) in above-mentioned solution, add the linking agent dialdehyde, mix.The mol ratio of amido: 0.01-1.0: 1 in the poly aspartic acid of aldehyde radical in the dialdehyde and band amido side chain;
(4) in addition chitosan is dissolved in the dilute acid soln.Described dilute acid soln can be a dilute hydrochloric acid solution, acetum, or the mixture of the two.The concentration of dilute acid soln is 1-2% (massfraction).The mass ratio of the diluted acid of chitosan and 1-2% is: 1: 1-1: 100;
(5) two solution that (3) (4) are obtained mix.The poly aspartic acid of band amido side chain and the mass ratio of chitosan are 1: 99-99: 1.
(6) hybrid mode can be under violent stirring, (3) all or in batches or progressively are added drop-wise in the solution that (4) obtain go, or (4) all or in batches or progressively be added drop-wise in the solution that (5) obtain go, or two solution and adding;
(7) reaction mixture that (6) are obtained reacts under 20-100 ℃ of temperature, reaction times 0.1-10 hour;
(8) afterwards under violent stirring, in mixing solutions, add alkali aqueous solution to pH2-7 in batches or progressively, used alkali is sodium hydroxide or potassium hydroxide, alkali concn is 1mol/L to 10mol/L;
(9) isolate solid, and wash with water to neutrality.Get the lightpink particulate solid 25-60 ℃ of following vacuum-drying.
The 6th kind: use the water medium method, add poly-day (door) winter propylhomoserin/chitin copolymer of template preparation, this method comprises the following steps:
Basic step just adds template with the 5th kind of embodiment in step (2) gained solution, carry out subsequent operations afterwards again.Template used dose is preferentially selected CaCl
2Or Ca (NO
3)
2, CaSO
4, ZnCl
2, MgCl
2, MgSO
4In one or both and two or more mixing, or other soluble nickel salt, mantoquita, molysite, manganese salt etc.The mol ratio of template and polysuccinimide (by the succimide unit) is 0.1-1: 1;
Also can in chitosan solution (4), add template.Or several template are joined in the chitosan solution (4), and other several template are joined in the solution (2) of poly aspartic acid of band amido side chain;
Need, also can carry out stripper plate agent operation to the gained resin, the agent of indication stripper plate is a disodium edta, citric acid or Trisodium Citrate complexing agent, acetate and/or acetate.
The 7th kind: use the water medium method, do not add poly-day (door) winter propylhomoserin/chitin copolymer of template preparation, this method comprises the following steps:
(1) preparation contains the poly aspartic acid aqueous solution of the side chain of an amido at least.Method is:
(a) preparation contains the salts solution of the polyamines of at least two amidos;
Above-mentioned polyamines can be one or both in the polyamines organic basess such as diamines or triamine, tetramine and two or more mixing.Said diamines or polyamines organic basess such as triamine, tetramine can be L-Methionin, hydrazine hydrate, quadrol, butanediamine.
(b) with above-mentioned solution by the mol ratio of polyamines with polysuccinimide (by the succimide unit): 0.10-0.5: 1 mixes.
The hybrid mode of above-mentioned polyamines salts solution and polysuccinimide can be under agitation, with the polyamines salts solution all or join in the suspension pulpous state liquid of polysuccinimide in water in batches or progressively and go, perhaps all or join in the polyamines solution in batches or progressively and go, with polysuccinimide or its suspension pulpous state aqueous solution or both and add;
(c) under 20-100 ℃ of temperature, drip alkali aqueous solution in the reaction mixture that obtains in batches or progressively in (b), all finish until reaction, used alkali is sodium hydroxide or potassium hydroxide, alkali concn is 1mol/L to 10mol/L, obtains having the poly aspartic acid aqueous solution of amido side chain.
(2) pH of the solution that (1) is obtained with hydrochloric acid soln transfers to below 7, preferably pH2-6;
(3) in above-mentioned solution, add the linking agent dialdehyde, mix.The mol ratio of amido: 0.01-1.0 in the poly aspartic acid of aldehyde radical in the dialdehyde and band amido side chain; Make the aqueous solution of the two mixture;
Described dialdehyde can be oxalic dialdehyde, aliphatic dialdehydes or aromatic series dialdehyde such as mda, glutaraldehyde.
(4) in addition chitosan is dissolved in the dilute acid soln.Described dilute acid soln can be a dilute hydrochloric acid solution, acetum, or the mixture of the two.The concentration of dilute acid soln is 1-2% (massfraction).The mass ratio of the diluted acid of chitosan and 1-2% is: 1: 1-1: 100;
(5) two solution that (3) (4) are obtained mix.The poly aspartic acid of band amido side chain and the mass ratio of chitosan are 1: 99-99: 1.
(6) hybrid mode can be under violent stirring, (3) all or in batches or progressively are added drop-wise in the solution that (4) obtain go, or (4) all or in batches or progressively be added drop-wise in the solution that (5) obtain go, or two solution and adding;
(7) reaction mixture that (6) are obtained reacts under 20-100 ℃ of temperature, reaction times 0.1-10 hour;
(8) afterwards under violent stirring, in mixing solutions, add alkali aqueous solution to pH2-7 in batches or progressively, used alkali is sodium hydroxide or potassium hydroxide, alkali concn is 1mol/L to 10mol/L;
(9) isolate solid, and wash with water to neutrality.Get the lightpink particulate solid 25-60 ℃ of following vacuum-drying.
The 8th kind: use the water medium method, add poly-day (door) winter propylhomoserin/chitin copolymer of template preparation, this method comprises the following steps:
Basic step just adds template with the 5th kind of embodiment in step (2) gained solution, carry out subsequent operations afterwards again.Template used dose is preferentially selected CaCl
2Or Ca (NO
3)
2, CaSO
4, ZnCl
2, MgCl
2, MgSO
4In one or both and two or more mixing, or other soluble nickel salt, mantoquita, molysite, manganese salt etc.The mol ratio of template and polysuccinimide (by the succimide unit) is 0.1-1: 1;
Also can in chitosan solution (4), add template.Or several template are joined in the chitosan solution (4), and other several template are joined in the solution (2) of poly aspartic acid of band amido side chain;
Need, also can carry out stripper plate agent operation to the gained resin, the agent of indication stripper plate is a disodium edta, citric acid or Trisodium Citrate complexing agent, acetate and/or acetate.
Embodiment 1: adding 10ml water and 1.0g weight-average molecular weight are about 10,000 polysuccinimide in beaker, form suspension, add 0.45g Methionin and 0.25g sodium hydroxide then under violent stirring.27 ℃ were reacted about 6 hours down, continued to add 0.15g sodium hydroxide, restir 1 hour.With dilute hydrochloric acid solution regulator solution pH5-6, add 0.3ml 50% glutaraldehyde (solution A) then.
Take by weighing the 0.1g chitosan in addition, add 10ml 1-2% hydrochloric acid and be dipped to dissolving (solution B) fully.
Under violent stirring, solution A is mixed with solution B.React 30min down at 30 ℃ afterwards.In mixing solutions, dropwise add 2mol/L NaOH solution then to pH6-7, filter out solid, and wash with water to neutrality.Get the lightpink particulate solid 45 ℃ of following vacuum-dryings.
Embodiment 2: adding 5ml water and 1.0g weight-average molecular weight are about 9,000 polysuccinimide in beaker, form suspension, progressively add under violent stirring then and contain 0.45g Methionin and 0.25g aqueous sodium hydroxide solution.27 ℃ were reacted about 6 hours down, continued to add 0.15g sodium hydroxide, restir 1 hour.With dilute hydrochloric acid solution regulator solution pH5-6.Add 0.25g CaCl afterwards
2, it is fully dissolved, add 0.3ml 50% glutaraldehyde (solution A) then.
Take by weighing the 0.2g chitosan in addition, add 10ml 1-2% hydrochloric acid and be dipped to dissolving (solution B) fully.
Under violent stirring, solution A is mixed with solution B.React 30min down at 30 ℃ afterwards.In mixing solutions, dropwise add 2mol/L NaOH solution then to pH6-7, filter out solid, and wash with water to neutrality.Get the lightpink particulate solid 45 ℃ of following vacuum-dryings.
Embodiment 3: the 1.0g polysuccinimide is joined 10ml contain in the aqueous solution of 0.45g Methionin and 0.4g sodium hydroxide under violent stirring.Reacted about 3 hours down at 27 ℃.With dilute hydrochloric acid solution regulator solution pH5-6.Add 0.3g FeCl afterwards
36H
2O fully dissolves it, adds 0.3ml50% glutaraldehyde (solution A) then.
Take by weighing the 0.5g chitosan in addition, add 10ml 1-2% hydrochloric acid and be dipped to dissolving (solution B) fully.
Under violent stirring, solution A is mixed with solution B.React 30min down at 30 ℃ afterwards.In mixing solutions, dropwise add 2mol/L NaOH solution then to pH6-7, filter out solid, and wash with water to neutrality.Get the lightpink particulate solid 45 ℃ of following vacuum-dryings.
Embodiment 4: add 5ml water and 1.0g polysuccinimide in beaker, form suspension, progressively add the aqueous solution that contains 0.6g one lysine hydrochloride and 0.4g sodium hydroxide then under violent stirring.27 ℃ were reacted about 6 hours down, continued to add 0.1g sodium hydroxide, restir 1 hour.With dilute hydrochloric acid solution regulator solution pH5-6.Add 0.4g Ca (NO afterwards
3)
2, it is fully dissolved, add 0.3ml 50% glutaraldehyde (solution A) then.
Take by weighing the 0.1g chitosan in addition, add 10ml 1-2% hydrochloric acid and be dipped to dissolving (solution B) fully.
Under violent stirring, solution A is mixed with solution B.React 30min down at 30 ℃ afterwards.In mixing solutions, dropwise add 2mol/L NaOH solution then to pH6-7, filter out solid, and wash with water to neutrality.Get the lightpink particulate solid 45 ℃ of following vacuum-dryings.
Embodiment 5 adds the NaOH aqueous solution and the 80% 1 hydrazine hydrate 0.13g of 4ml 2mol/L in the beaker of 100ml.Under violent stirring, add the 1.0g weight-average molecular weight and be about 20,000 polysuccinimide, reacted about 3 hours down at 25 ℃.With dilute hydrochloric acid solution regulator solution pH5-6.Add 0.25g CaCl afterwards
2, it is fully dissolved, add 0.3ml 50% glutaraldehyde (solution A) then.
Take by weighing the 0.3g chitosan in addition, add 10ml 1-2% hydrochloric acid and be dipped to dissolving (solution B) fully.
Under violent stirring, solution A is mixed with solution B.React 30min down at 30 ℃ afterwards.In mixing solutions, dropwise add 2mol/L NaOH solution then to pH6-7, filter out solid, and wash with water to neutrality.Get the lightpink particulate solid 45 ℃ of following vacuum-dryings.
Embodiment 6 adds 1g (0.01mol) weight-average molecular weight and is about 5 in the 100ml flask, the pulpous state suspension of 000 polysuccinimide in 3ml water, then in batches or the mixed solution of the NaOH aqueous solution of disposable adding 3ml2mol/L and 0.2g quadrol, reacted about 5 hours down at 25 ℃, with dilute hydrochloric acid solution regulator solution pH5-6.Add 0.25g CaCl afterwards
2, it is fully dissolved, add 0.3ml 50% glutaraldehyde (solution A) then.
Take by weighing the 0.2g chitosan in addition, add 10ml 1-2% hydrochloric acid and be dipped to dissolving (solution B) fully.
Under violent stirring, solution A is mixed with solution B.React 30min down at 30 ℃ afterwards.In mixing solutions, dropwise add 2mol/L NaOH solution then to pH6-7, filter out solid, and wash with water to neutrality.Get the lightpink particulate solid 45 ℃ of following vacuum-dryings.
Embodiment 7: with 1.62g polysuccinimide, 15g N, dinethylformamide (DMF) is put into the 100mL flask, stirring makes the solid materials dissolving, with a little distilled water 0.5g L-Methionin and 0.15g NaOH are dissolved respectively in addition, mix then, mixed solution is under agitation joined in the above-mentioned polysuccinimide solution, and the solution that this is mixed is put into the microwave oven that reflux is housed then, heats 2min under power 120W.After being cooled to room temperature, adding the 50mL anhydrous methanol and separate out product.With about 50mL anhydrous methanol washing precipitate 3 times, filter, drying.
To go up the step products therefrom and put into beaker, and add 10mL water and make it to become suspension, and drip the NaOH aqueous solution of 2mol/L then under room temperature and stirring, hierarchy of control pH=11～12 are until reaction system yellowly clarified liq (needing 1h approximately).After reaction finishes, add anhydrous methanol and separate out yellow product, filter, filter cake obtains having the poly aspartic acid of amido side chain at 40 ℃ of following vacuum-drying 4h.Take by weighing 0.5g and have the poly aspartic acid of amido side chain, make it dissolving, add the aqueous solution that contains the 0.2g mda, obtain solution A with 5ml water.
Take by weighing the 0.1g chitosan in addition, add 10ml 1-2% hydrochloric acid and be dipped to dissolving fully, obtain solution B.The gained solution B is progressively joined under violent stirring among the gained chitosan solution A.React 10min down at 25 ℃.Afterwards, in mixing solutions, dropwise add 2mol/L NaOH solution, filter out solid, and wash with water to neutrality to pH6-7.Get the lightpink particulate solid 40 ℃ of following vacuum-dryings.
Embodiment 8: with 0.8g polysuccinimide, 10g N, dinethylformamide (DMF) is put into the 100mL beaker, stirring makes the solid materials dissolving, with a little distilled water 0.25g L-Methionin and 0.8g NaOH are dissolved respectively in addition, mix then, to join in the above-mentioned polysuccinimide solution under the mixed solution stirring, the solution that this is mixed at room temperature stirs 10h then, adds the 30mL anhydrous methanol afterwards and separates out product.With about 20mL anhydrous methanol washing precipitate 3 times, filter, drying.
To go up the step products therefrom and put into beaker, add 10mL water and make it to become suspension, under room temperature and stirring, drip the NaOH aqueous solution of 2mol/L then, hierarchy of control pH=11～12, until reaction system yellowly clarified liq, obtain having the poly aspartic acid aqueous solution of amido side chain.Add 0.2mL massfraction 50% glutaraldehyde water solution then, obtain solution A.
Take by weighing the 0.2g chitosan in addition, add 10ml 1-2% hydrochloric acid and be dipped to dissolving fully, obtain solution B.
The gained solution A is progressively joined under violent stirring among the gained chitosan solution B.React 20min down at 25 ℃.Afterwards, in mixing solutions, dropwise add 2mol/L NaOH solution, filter out solid, and wash with water to neutrality to pH6-7.Get the lightpink particulate solid 40 ℃ of following vacuum-dryings.
Embodiment 9: take by weighing the 0.1g chitosan, with 10ml 1-2% hydrochloric acid: the mixed acid solution of 1-2% acetic acid (volume ratio)=3: 1 (v/v) makes it to dissolve fully (solution A).Take by weighing 0.8g in addition and have the poly aspartic acid of amido side chain, make it dissolving, add 0.2mL massfraction 50% glutaraldehyde water solution, with dilute hydrochloric acid solution regulator solution pH5-6 (solution B) with 5ml water.Under violent stirring, solution A is joined in the solution B.React 30min down at 30 ℃.In mixing solutions, dropwise add 2mol/L NaOH solution then to pH6-7, filter out solid, and wash with water to neutrality.Get the lightpink particulate solid 45 ℃ of following vacuum-dryings.
Embodiment 10: operation steps just adds template 0.2g FeCl earlier substantially with example 7,8,9 before adding glutaraldehyde
2, and then carry out the operation of back.
Embodiment 11: operation steps is substantially with example 1, and example 2 is after chitosan solution is added the 0.1g neutralized verdigris, to mix with solution B, and then carry out the operation of back.
Claims (13)
1, a kind of method for preparing poly aspartic acid and chitin copolymer is characterized in that may further comprise the steps:
(1) polysuccinimide and polyamines are reacted, contained poly aspartic acid or its aqueous solution of the side chain of an amido at least; Polyamines with mol ratio by the polysuccinimide of succimide unit is: 0.10-0.50: 1.
(2) poly aspartic acid of the side chain that contains an amido at least that will obtain adds linking agent aliphatics or aromatic series dialdehyde again, makes mixed aqueous solution; The mol ratio of amido is in the poly aspartic acid of aldehyde radical in aliphatics or the aromatic series dialdehyde and band amido side chain: 0.01-1.0: 1;
(3) the preparation chitosan solution is dissolved in chitosan in the dilute acid soln, and the concentration of dilute acid soln is massfraction 1-2%, and the mass ratio of the diluted acid of chitosan and 1-2% is: 1: 1-1: 100;
Above-mentioned (2) that (4) will obtain, (3) two solution are 1 in the poly aspartic acid of band amido side chain and the mass ratio of chitosan: 99-99: 1 ratio, under violent stirring, mix, and again reaction mixture was reacted 0.1-10 hour under 20-100 ℃ of temperature;
(5) afterwards under violent stirring, in mixing solutions, add alkali aqueous solution to pH2-7 in batches or progressively;
(6) isolate solid, and wash with water to washing lotion for neutral, get the lightpink particulate solid 25-60 ℃ of following vacuum-drying.
2, in accordance with the method for claim 1, it is characterized in that said step can also prepare after the aqueous solution of the poly aspartic acid that has the amido side chain and (3) prepare chitosan solution in (1), adds template among one of both solution or both solution; Template is one or both and the two or more mixing in soluble calcium salt, magnesium salts, zinc salt, nickel salt, mantoquita, molysite, the manganese salt; Template is 0.1-1 with mol ratio by the polysuccinimide of succimide unit: 1.
3, according to claim 1 or 2 described methods, it is characterized in that said step can also or add the stripper plate agent among step (6) afterwards: disodium edta, citric acid or Trisodium Citrate complexing agent, acetate and/or acetate carry out stripper plate agent operation to the gained resin.
4, according to claim 1 or 2 described methods, it is soluble in water to it is characterized in that said step (1) prepares the poly aspartic acid that has the amido side chain, and the poly aspartic acid of band amido side chain and the mass ratio of water are: 1: 99-99: 1.
5, in accordance with the method for claim 4, it is characterized in that said water is deionized water.
6, in accordance with the method for claim 3, it is characterized in that the used reaction solvent of said step (1) can be the organic solvent dimethyl formamide, or inorganic solvent.
7, in accordance with the method for claim 6, it is characterized in that said inorganic solvent is a water.
8, according to claim 1 or 2 described methods, it is characterized in that said aliphatics or aromatic series dialdehyde can be oxalic dialdehyde, mda, glutaraldehyde, terephthal aldehyde.
9,, it is characterized in that said polyamines is one or both and the two or more mixing in diamines or triamine, the tetramine polyamines organic bases according to claim 1 or 2 described methods.
10, in accordance with the method for claim 9, it is characterized in that said diamines or triamine, tetramine are L-Methionin, hydrazine hydrate, quadrol, butanediamine, or have the polyamines of second kind of functional group.
11, according to claim 1 or 2 described methods, the blending means that it is characterized in that said step (4) is: the solution that (2) are obtained all or in batches or progressively is added drop-wise in the solution that (3) obtain and goes, or the solution that (3) obtain all or in batches or progressively is added drop-wise in the solution that (2) obtain goes, or two solution and adding.
12,, it is characterized in that dilute acid soln can be a dilute hydrochloric acid solution described in the said step (3), acetum, or the mixture of the two according to claim 1 or 2 described methods.
13, according to claim 1 or 2 described methods, it is characterized in that used alkali is sodium hydroxide or potassium hydroxide in the said step (5), alkali concn is 1mol/L to 10mol/L.
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| CN100412113C (en) * | 2006-08-18 | 2008-08-20 | 天津理工大学 | Method for preparing interpolymer bionic membrane material of poly-asparagine and chitosan |
| CN102247817B (en) * | 2011-05-03 | 2012-12-26 | 大连理工大学 | Endotoxin adsorbent using molecular cluster as functional group and preparation method thereof |
| CN102816348B (en) * | 2012-08-01 | 2015-02-25 | 宁波大学 | Chitosan aspartic acid and succinic acid compound salt and application thereof as freshener |
| CN104231267B (en) * | 2014-09-05 | 2017-05-31 | 武汉理工大学 | A kind of preparation of modified polyaspartic acid scale inhibitor and its application process |
| CN104970274B (en) * | 2015-05-29 | 2018-08-28 | 渤海大学 | A method of removing removing heavy metals from marine animal protein enzymatic hydrolyzate |
| CN110102082B (en) * | 2019-05-21 | 2022-05-17 | 浙江省海洋水产研究所 | Method for removing heavy metal cadmium in shellfish enzymolysis liquid |
| CN111303894B (en) * | 2020-02-19 | 2021-08-27 | 北京联合大学 | Lignin-based composite stabilizer for in-situ remediation of heavy metal pollution in soil and preparation method thereof |
| CN112717209B (en) * | 2020-12-29 | 2022-05-20 | 中国科学院理化技术研究所 | Antibacterial polyethylene composite material for intrauterine device and preparation method and application thereof |
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| CN1083460C (en) * | 1997-03-21 | 2002-04-24 | 三井化学株式会社 | Production process of cross-linked polyaspartic acid resin |
| CN1587282A (en) * | 2004-07-29 | 2005-03-02 | 上海交通大学 | Process for preparing poly succinimide crosslinking modified chitosan material |
| CN1631517A (en) * | 2004-11-17 | 2005-06-29 | 天津理工大学 | Method for preparing polyaspartic acid heavy metal absorbing resin by aqueous medium method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1083460C (en) * | 1997-03-21 | 2002-04-24 | 三井化学株式会社 | Production process of cross-linked polyaspartic acid resin |
| CN1587282A (en) * | 2004-07-29 | 2005-03-02 | 上海交通大学 | Process for preparing poly succinimide crosslinking modified chitosan material |
| CN1631517A (en) * | 2004-11-17 | 2005-06-29 | 天津理工大学 | Method for preparing polyaspartic acid heavy metal absorbing resin by aqueous medium method |
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