CN115874445A - Amino modified calcium alginate fiber non-woven fabric and preparation method thereof - Google Patents
Amino modified calcium alginate fiber non-woven fabric and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an amino modified calcium alginate fiber non-woven fabric and a preparation method thereof, belonging to the technical field of fabric surface treatment, wherein the preparation method comprises the following steps: step 1, soaking a calcium alginate fiber non-woven fabric in glutaraldehyde aqueous solution for reaction after washing; step 2, drying the glutaraldehyde grafted calcium alginate fiber non-woven fabric obtained in the step 1; step 3, soaking the glutaraldehyde grafted calcium alginate fiber non-woven fabric in an amino-terminated hyperbranched polymer solution for reaction; and 4, drying the amino modified calcium alginate fiber non-woven fabric obtained in the step 3. The prepared product has high lead ion adsorption capacity, can be used for purifying lead-containing sewage, and is simple to operate, good in stability, low in cost, low in operating condition requirement and beneficial to large-scale industrial production.
Description
Technical Field
The invention belongs to the technical field of fabric surface treatment, and particularly relates to an amino modified calcium alginate fiber non-woven fabric and a preparation method thereof.
Background
Heavy metal lead ions in the wastewater have high toxicity, cannot be degraded, and are stored in water for a long time, so that the environment and the life health of human beings are damaged. Heavy metal lead ions are usually present in water in a trace amount, and have serious influence on the health of organisms through the biological enrichment effect. At present, methods for removing heavy metal lead ions in wastewater mainly include a chemical precipitation method, an electrochemical reduction method, an ion exchange method, a membrane separation method, an adsorption method and the like. Wherein, the chemical precipitation method has no selectivity and can cause secondary pollution; the electrochemical reduction cost is high and the efficiency is low; the ion exchange method has high cost, limited application range and high requirement on sewage; the membrane separation method mainly comprises electrodialysis and reverse osmosis, wherein electrodialysis has high filtration efficiency and can be recycled, but electrodialysis has small water treatment amount and high cost, and reverse osmosis has high removal rate and simple operation, but membranes have low strength, short service life and easy blockage. The adsorption method is considered to be the best adsorption method due to the advantages of simple preparation, low cost, high selectivity, reusability of the adsorbent and the like. In view of this, an excellent and effective low-carbon water purification method is needed in the field of heavy metal wastewater treatment.
Alginic acid is a component of seaweed plants, has natural biocompatibility and biodegradability, and has the characteristics of excellent moisture absorption, heavy metal adsorption and the like. Alginate fibers prepared from marine biomaterials are an important component of the biological manufacturing industry, and the environment-friendly characteristic of the alginate fibers has important significance for replacing fossil resources, developing circular economy, building resource-saving and environment-friendly society. Therefore, the invention provides a novel surface treatment mode aiming at the problem that the adsorption performance of calcium alginate fibers (CA) for heavy metal ions is enhanced.
Hyperbranched polymers (HBP) are a classThe highly branched three-dimensional dendritic macromolecular material different from a linear polymer has multiple branching points, molecular chains are not easy to tangle, the viscosity is not changed along with the increase of molecular weight, and the material also has rich terminal functional groups. Amino-terminated hyperbranched polymer (HBP-NH) 2 ) Is a quasi-spherical polymer with a molecular structure different from linear high molecular polymer and common small molecular compound, HBP-NH 2 The molecule (a) contains an extremely large amount of amino groups, imino groups and tertiary amino groups on the surface, making it an excellent amino modifier. Has been widely applied to the fields of coating, nanotechnology, additives, biological materials and the like. Because of having rich amino functional groups, the amino functional group can generate chelation with various heavy metals to remove heavy metal ions in water, and can also be applied to heavy metal adsorption materials. CN109225174A discloses a modified calcium alginate fiber heavy metal adsorption material and a preparation method thereof, wherein calcium alginate fibers are used as main raw materials, glutaraldehyde and hyperbranched polymers are adopted to prepare the modified calcium alginate fiber heavy metal adsorption material, and the adsorption amounts of the calcium alginate fibers before and after modification are greatly improved, but the preparation method has the disadvantages of waste and high production cost due to large raw material consumption; in addition, the adoption of the calcium alginate fiber has the problems of difficult processing and the like, and the modification method directly adds the hyperbranched polymer into the solution containing Glutaraldehyde (GA) dropwise, so that the hyperbranched polymer directly reacts with the glutaraldehyde in the solution, the effective reaction rate on the fiber is reduced, and meanwhile, a large amount of ineffective reaction products are attached to the surface of the calcium alginate fiber, and the adsorption performance of fibril is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of an amino modified calcium alginate fiber non-woven fabric, which has the advantages of simple operation, good stability, lower cost and low requirement on operation conditions, and is beneficial to large-scale industrial production; the invention also aims to provide an amino modified calcium alginate fiber non-woven fabric with excellent heavy metal lead ion adsorption capacity.
In order to achieve the purpose, the invention adopts the following technical scheme: the preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, washing a calcium alginate fiber non-woven fabric, and soaking the calcium alginate fiber non-woven fabric in a glutaraldehyde aqueous solution for reaction to obtain a glutaraldehyde grafted calcium alginate fiber non-woven fabric; step 2, drying the glutaraldehyde grafted calcium alginate fiber non-woven fabric obtained in the step 1; step 3, soaking the glutaraldehyde grafted calcium alginate fiber non-woven fabric in an amino-terminated hyperbranched polymer solution for reaction to obtain an amino-modified calcium alginate fiber non-woven fabric; and 4, drying the amino modified calcium alginate fiber non-woven fabric obtained in the step 3.
Further, the water washing in the step 1 is deionized water ultrasonic water washing.
Further, the concentration of the glutaraldehyde aqueous solution in the step 1 is 5wt% -10 wt%.
Further, the reaction temperature in the step 1 is 50-60 ℃, and the reaction time is 1 hour.
Further, the mass ratio of the calcium alginate fiber non-woven fabric to the glutaraldehyde in the step 1 is 1:1-1.
Further, the concentration of the amino-terminated hyperbranched polymer solution in the step 3 is 0.1-2 g/L.
Further, the mass ratio of the calcium alginate fiber non-woven fabric to the amino-terminated hyperbranched polymer solution in the step 3 is 1:1-1.
Further, the reaction temperature in the step 3 is 50-60 ℃, and the reaction time is 30-60min.
Further, the drying treatment in the step 2 and the step 4 is extrusion roller extrusion.
The amino modified calcium alginate fiber non-woven fabric obtained by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
(1) The carrier used in the invention is alginate fiber non-woven fabric, so that the condition that the modified fiber is not easy to process is effectively avoided, and meanwhile, the non-woven fabric is rich in strength but not compact, and has the advantages of forming, good mechanical property and no influence on sufficient reaction;
(2) The preparation method has low cost and low energy consumption. The media required in the reaction process are all aqueous solutions, so that the method is green, nontoxic, low in cost and beneficial to industrial production; the temperature range required in the reaction process is lower and is between 50 and 60 ℃, so that the energy consumption and the production cost are reduced; the reaction time is short, each step is 30-60min, the process steps are simple, and the energy consumption is low; hot air drying is not needed, and only compression roller extrusion drying is needed, so that high energy consumption of hot air is avoided, and simultaneously, the situation that the hardness of the non-woven fabric is increased and the brittleness and the adsorption performance are reduced due to hot air drying is avoided;
(3) The invention can effectively improve the adsorption performance. By improving the pertinence of the grafting reaction, the added amino-terminated hyperbranched polymer is prevented from being mostly consumed by a large amount of residual glutaraldehyde in the solution, and the problem of reduced adsorption performance caused by the fact that a large amount of invalid reaction products are attached to the surface of calcium alginate is avoided while the materials are saved. Compared with the prior art, the adsorption capacity of the invention is improved by 20-40%, the limit of the adsorption capacity of the prior art is less than 800mg/g, and the limit of the adsorption capacity of the invention reaches 1100-1500mg/g under the concentration of 2500ppm lead solution.
Drawings
FIG. 1 is a schematic view of the preparation process of the present invention.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
The preparation method of the amino modified calcium alginate fiber non-woven fabric is shown in figure 1, and comprises the following steps: step 1, preparing a GA aqueous solution with the concentration of 5wt%, soaking the CA non-woven fabric in the GA aqueous solution to fully wet the surface of the CA non-woven fabric in the GA aqueous solution, and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 50 ℃ for 1 hour to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl groups, thus obtaining the CA-GA non-woven fabric; step 2, carrying out compression roller extrusion drying treatment on the CA-GA non-woven fabric, and removing redundant unreacted GA in the solution; step 3, preparing 0.8g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Performing surface chemical grafting modification treatment on the aqueous solution at 50 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group to obtain CA-GA-HBP-NH 2 A non-woven fabric; step 4, carrying out reaction on CA-GA-HBP-NH 2 The non-woven fabric is subjected to compression roller extrusion drying treatment to remove excessive unreacted HBP-NH in the solution 2 。
Example 2
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, preparing a 10wt% GA aqueous solution, soaking a CA non-woven fabric in the GA aqueous solution to fully wet the surface of the CA non-woven fabric in the GA aqueous solution and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 50 ℃ for 1 hour to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl groups, thus obtaining the CA-GA non-woven fabric; step 2, carrying out compression roller extrusion drying treatment on the CA-GA non-woven fabric, and removing redundant unreacted GA in the solution; step 3, preparing 0.8g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Carrying out surface chemical grafting modification treatment on the obtained product in an aqueous solution at 50 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group, thus obtaining CA-GA-HBP-NH 2 A non-woven fabric; step 4, carrying out reaction on CA-GA-HBP-NH 2 Pressing the non-woven fabric with a press roll, extruding and drying to remove excessive unreacted HBP-NH in the solution 2 。
Example 3
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, preparing a GA aqueous solution with the concentration of 5wt%, soaking a CA non-woven fabric in the GA aqueous solution to fully wet the surface of the CA non-woven fabric in the GA aqueous solution and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 60 ℃ for 1 hour to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl groups, and thus obtaining the CA-GA non-woven fabric; step 2, carrying out compression roller extrusion drying treatment on the CA-GA non-woven fabric to remove redundant unreversed fibers in the solutionThe corresponding GA; step 3, preparing 0.8g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Carrying out surface chemical grafting modification treatment on the obtained product in an aqueous solution at 50 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group, thus obtaining CA-GA-HBP-NH 2 A non-woven fabric; step 4, carrying out reaction on CA-GA-HBP-NH 2 The non-woven fabric is subjected to compression roller extrusion drying treatment to remove excessive unreacted HBP-NH in the solution 2 。
Example 4
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, preparing a GA aqueous solution with the concentration of 5wt%, soaking the CA non-woven fabric in the GA aqueous solution to fully wet the surface of the CA non-woven fabric in the GA aqueous solution, and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 50 ℃ for 30min to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl groups, so as to obtain the CA-GA non-woven fabric; step 2, carrying out compression roller extrusion drying treatment on the CA-GA non-woven fabric, and removing redundant unreacted GA in the solution; step 3, preparing 0.8g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Carrying out surface chemical grafting modification treatment on the obtained product in an aqueous solution at 50 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group, thus obtaining CA-GA-HBP-NH 2 A non-woven fabric; step 4, carrying out reaction on CA-GA-HBP-NH 2 The non-woven fabric is subjected to compression roller extrusion drying treatment to remove excessive unreacted HBP-NH in the solution 2 。
Example 5
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, preparing a GA aqueous solution with the concentration of 5wt%, soaking the CA non-woven fabric in the GA aqueous solution to fully wet the surface of the CA non-woven fabric in the GA aqueous solution and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 50 ℃ for 1 hour to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl, and thus obtaining the calcium alginate fiber surface-hydroxyl-modified calcium alginate fiberA CA-GA nonwoven fabric; step 2, carrying out compression roller extrusion drying treatment on the CA-GA non-woven fabric, and removing redundant unreacted GA in the solution; step 3, preparing 0.1g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Carrying out surface chemical grafting modification treatment on the obtained product in an aqueous solution at 50 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group, thus obtaining CA-GA-HBP-NH 2 A non-woven fabric; step 4, carrying out reaction on CA-GA-HBP-NH 2 The non-woven fabric is subjected to compression roller extrusion drying treatment to remove excessive unreacted HBP-NH in the solution 2 。
Example 6
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, preparing a GA aqueous solution with the concentration of 5wt%, soaking the CA non-woven fabric in the GA aqueous solution to fully wet the surface of the CA non-woven fabric in the GA aqueous solution, and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 50 ℃ for 1 hour to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl groups, thus obtaining the CA-GA non-woven fabric; step 2, carrying out compression roller extrusion drying treatment on the CA-GA non-woven fabric, and removing redundant unreacted GA in the solution; step 3, preparing 0.8g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Surface chemical grafting modification treatment is carried out in aqueous solution at 60 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group, and then CA-GA-HBP-NH is obtained 2 A non-woven fabric; step 4, carrying out reaction on CA-GA-HBP-NH 2 The non-woven fabric is subjected to compression roller extrusion drying treatment to remove excessive unreacted HBP-NH in the solution 2 。
Comparative example 1
And (3) carrying out deionized water ultrasonic washing on the calcium alginate fiber non-woven fabric.
Comparative example 2
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, preparing GA water with concentration of 5wt%Soaking the CA non-woven fabric in a GA aqueous solution to fully wet the surface of the CA non-woven fabric in the GA aqueous solution and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 50 ℃ for 1 hour to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl groups, thus obtaining the CA-GA non-woven fabric; step 2, preparing 0.8g/L HBP-NH 2 Water solution, and dripping into the solution system in the step 1; step 3, carrying out reaction on CA-GA-HBP-NH 2 The non-woven fabric is subjected to compression roller extrusion drying treatment to remove excessive unreacted HBP-NH in the solution 2 。
Comparative example 3
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, preparing a GA aqueous solution with the concentration of 5wt%, soaking a CA woven fabric in the GA aqueous solution to fully wet the surface of the CA non-woven fabric in the GA aqueous solution, and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 50 ℃ for 1 hour to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl groups, so as to obtain the CA-GA non-woven fabric; step 2, carrying out hot air drying treatment on the CA-GA non-woven fabric; step 3, preparing 0.8g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Carrying out surface chemical grafting modification treatment on the obtained product in an aqueous solution at 50 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group, thus obtaining CA-GA-HBP-NH 2 A non-woven fabric; step 4, carrying out reaction on CA-GA-HBP-NH 2 The non-woven fabric is subjected to compression roller extrusion drying treatment to remove excessive unreacted HBP-NH in the solution 2 。
Comparative example 4
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, soaking a CA non-woven fabric in a GA aqueous solution by using a GA aqueous solution with the concentration of 5wt%, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 50 ℃ for 1 hour to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl groups, thereby obtaining the CA-GA non-woven fabric; step 2, to CA-GA non-woven fabricCarrying out compression roller extrusion drying treatment on the woven fabric to remove the excessive unreacted GA in the solution; step 3, preparing 10g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Performing surface chemical grafting modification treatment on the aqueous solution at 50 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group to obtain CA-GA-HBP-NH 2 A non-woven fabric; step 4, carrying out reaction on CA-GA-HBP-NH 2 Pressing the non-woven fabric with a press roll, extruding and drying to remove excessive unreacted HBP-NH in the solution 2 。
Comparative example 5
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, soaking a CA non-woven fabric in a GA aqueous solution by using a GA aqueous solution with the concentration of 5wt%, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 30 ℃ for 1 hour to realize chemical linkage of GA and calcium alginate fiber surface groups-hydroxyl groups, thereby obtaining the CA-GA non-woven fabric; step 2, carrying out compression roller extrusion drying treatment on the CA-GA non-woven fabric, and removing redundant unreacted GA in the solution; step 3, preparing 0.8g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Carrying out surface chemical grafting modification treatment on the obtained product in an aqueous solution at 30 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group, thus obtaining CA-GA-HBP-NH 2 A non-woven fabric; step 4, carrying out reaction on CA-GA-HBP-NH 2 The non-woven fabric is subjected to compression roller extrusion drying treatment to remove excessive unreacted HBP-NH in the solution 2 。
Comparative example 6
The preparation method of the amino modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, soaking the CA non-woven fabric in a GA aqueous solution by using the GA aqueous solution with the concentration of 5wt%, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and carrying out surface chemical grafting modification treatment on the CA non-woven fabric at 70 ℃ for 1 hour to implementCarrying out chemical linkage of GA and a surface group-hydroxyl group of calcium alginate fiber to obtain a CA-GA non-woven fabric; step 2, carrying out compression roller extrusion drying treatment on the CA-GA non-woven fabric, and removing redundant unreacted GA in the solution; step 3, preparing 0.8g/L HBP-NH 2 Aqueous solution, soaking CA-GA non-woven fabric in HBP-NH 2 In the water solution, the surface of the CA-GA non-woven fabric is fully wetted with HBP-NH 2 Performing surface chemical grafting modification treatment on the aqueous solution at 70 ℃ to realize chemical linkage of amino and CA-GA surface group-aldehyde group to obtain CA-GA-HBP-NH 2 A non-woven fabric; step 4, for CA-GA-HBP-NH 2 Pressing the non-woven fabric with a press roll, extruding and drying to remove excessive unreacted HBP-NH in the solution 2 。
The adsorption performance detection is carried out on the examples 1-6 and the comparative examples 1-6, and the detection method specifically comprises the following steps: placing the non-woven fabric to be tested in a triangular flask, adding 1000PPm of lead ion solution, adsorbing at 30 ℃ until adsorption balance is achieved, and calculating the lead ion adsorption amount of each gram of material through testing of an ultraviolet spectrophotometer. The results of the lead ion adsorption amounts of examples 1 to 6 and comparative examples 1 to 6 are shown in table 1.
TABLE 1 adsorption of lead ions to fabrics
| Adsorption quantity mg/g | |
| Example 1 | 545 |
| Example 2 | 539 |
| Example 3 | 543 |
| Example 4 | 539 |
| Example 5 | 534 |
| Example 6 | 543 |
| Comparative example 1 | 388 |
| Comparative example 2 | 413 |
| Comparative example 3 | 421 |
| Comparative example 4 | 519 |
| Comparative example 5 | 512 |
| Comparative example 6 | 518 |
As can be seen from Table 1, in examples 1-6, compared with comparative example 1, the adsorption capacity of calcium alginate fiber nonwoven fabric to heavy metal lead ions is effectively improved after the calcium alginate fiber nonwoven fabric is subjected to surface treatment by the method of the invention.
Compared with the comparative example 2, in the example 1, the amino-terminated hyperbranched polymer solution is not directly added into the solution containing glutaraldehyde, so that the amino-terminated hyperbranched polymer is effectively prevented from directly reacting with glutaraldehyde in the solution, ineffective reaction is reduced, effective selective reaction between the amino-terminated hyperbranched polymer and calcium alginate fibers is improved, the effective utilization rate of the amino-terminated hyperbranched polymer is improved, material loss is reduced, the production cost is reduced, side reaction between double aldehyde groups of glutaraldehyde and the amino-terminated hyperbranched polymer is effectively reduced, and a large amount of side reaction products are prevented from being attached to the fiber surface of the non-woven fabric so as to reduce the heavy metal lead ion adsorption performance of the non-woven fabric. The adsorption amount in comparative example 2 was reduced by 24% compared to example 1, probably due to the large amount of side-reaction substances of glutaraldehyde dialdehyde and the amino-terminated hyperbranched polymer attached to the surface of the nonwoven fabric.
Compared with the comparative example 3, the comparative example 3 has low adsorption capacity because the fiber is hardened and brittle in the hot air drying process, the shape and structure of the fiber are changed in the wetting and drying processes, the grafting condition of the amino-terminated hyperbranched polymer is influenced, and the lead ion adsorption performance is reduced. The invention adopts the extrusion roller for extrusion drying, effectively avoids the condition that the hardening brittleness of the fiber is increased in the hot air drying process to influence the next reaction, simultaneously removes redundant glutaraldehyde solution, and improves the grafting selectivity of the amino-terminated hyperbranched polymer on the fiber in the next step. In addition, extrusion drying is carried out by adopting an extrusion roller, so that the energy consumption is effectively reduced, and the production cost is reduced.
Compared with the comparative example 4, the adsorption amount in the comparative example 4 is reduced, which may be caused by that a large amount of excessive amino-terminated hyperbranched polymer is attached to the surface of the calcium alginate non-woven fabric, so that the effective adsorption is reduced, and the adsorption performance is influenced.
Compared with the comparative example 5, the reaction temperature of the comparative example 1 is lower, and the adsorption quantity is lower; compared with the comparative example 6, the reaction temperature of the comparative example 6 is higher, but the adsorption amount is lower, which shows that the preparation method of the invention does not need excessively high reaction temperature, can reduce energy consumption and production cost.
Claims (10)
1. The preparation method of the amino modified calcium alginate fiber non-woven fabric is characterized by comprising the following steps:
step 1, washing a calcium alginate fiber non-woven fabric, and soaking the calcium alginate fiber non-woven fabric in a glutaraldehyde aqueous solution for reaction to obtain a glutaraldehyde grafted calcium alginate fiber non-woven fabric;
step 2, drying the glutaraldehyde grafted calcium alginate fiber non-woven fabric obtained in the step 1;
step 3, soaking the glutaraldehyde grafted calcium alginate fiber non-woven fabric in an amino-terminated hyperbranched polymer solution for reaction,
obtaining amino modified calcium alginate fiber non-woven fabric;
and 4, drying the amino modified calcium alginate fiber non-woven fabric obtained in the step 3.
2. The method for preparing the amino modified calcium alginate fiber non-woven fabric according to claim 1, wherein the water washing in the step 1 is deionized water ultrasonic water washing.
3. The method for preparing the amino modified calcium alginate fiber non-woven fabric according to claim 1, wherein the concentration of the glutaraldehyde aqueous solution in the step 1 is 5-10 wt%.
4. The method for preparing the amino modified calcium alginate fiber non-woven fabric according to claim 1, wherein the reaction temperature in the step 1 is 50-60 ℃ and the reaction time is 1 hour.
5. The method for preparing the amino modified calcium alginate fiber non-woven fabric according to claim 1, wherein the mass ratio of the calcium alginate fiber non-woven fabric to glutaraldehyde in the step 1 is 1:1-1.
6. The method for preparing amino modified calcium alginate fiber non-woven fabric according to claim 1, wherein the concentration of the amino terminated hyperbranched polymer solution in the step 3 is 0.1-2 g/L.
7. The method for preparing the amino modified calcium alginate fiber non-woven fabric according to claim 1, wherein the mass ratio of the calcium alginate fiber non-woven fabric to the amino terminated hyperbranched polymer solution in the step 3 is 1:1-1.
8. The method for preparing the amino modified calcium alginate fiber non-woven fabric according to claim 1, wherein the reaction temperature in the step 3 is 50-60 ℃ and the reaction time is 30-60min.
9. The method for preparing the amino modified calcium alginate fiber nonwoven fabric as claimed in claim 1, wherein the drying treatment in the step 2 and the step 4 is squeeze roll extrusion.
10. An amino-modified calcium alginate fiber nonwoven fabric obtained by the preparation method of any one of claims 1 to 9.
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