Amino-modified calcium alginate fiber nonwoven fabric and method for producing the same

Abstract

The application discloses a kind of amino-modified calcium alginate fiber nonwoven fabrics and preparation method thereof, belong to fabric surface treatment technical field, its preparation method includes the following steps: step 1, after washing with water, calcium alginate fiber nonwoven fabric is soaked in glutaraldehyde aqueous solution and reacts;Step 2, the glutaraldehyde grafted calcium alginate fiber nonwoven fabric obtained in step 1 is dry treated;Step 3, glutaraldehyde grafted calcium alginate fiber nonwoven fabric is soaked in terminal amino hyperbranched polymer solution and reacts;Step 4, the amino-modified calcium alginate fiber nonwoven fabric obtained in step 3 is dry treated.The prepared product has high lead ion adsorption capacity and can be used for purification treatment of lead-containing wastewater.The preparation method is simple to operate, stable, low in cost and low in operating condition requirement, which is conducive to large-scale industrial production.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fabric surface treatment, and particularly relates to a kind of amino-modified calcium alginate fiber non-woven fabric and its preparation method. BACKGROUND

[0002] Heavy metal lead ions in wastewater are highly toxic and cannot be degraded, persisting in water for a long time, endangering the environment and human life and health. Heavy metal lead ions are usually present in trace amounts in water and have a serious impact on biological health through biological enrichment. Currently, the methods for removing heavy metal lead ions from wastewater include chemical precipitation, electrochemical reduction, ion exchange, membrane separation, and adsorption. Among them, the chemical precipitation method has no selectivity and can cause secondary pollution; the electrochemical reduction method has high cost and low efficiency; the ion exchange method has high cost, limited application range, and high requirements for wastewater; the membrane separation method mainly includes electrodialysis and reverse osmosis, electrodialysis has high filtration efficiency and can be recycled, but has small water treatment capacity and high cost, reverse osmosis has high removal rate and simple operation, but has low membrane strength, short service life, and is prone to blockage. The adsorption method is considered to be the best adsorption method due to its simple preparation, low cost, high selectivity, and reusable adsorbent. Therefore, the field of heavy metal wastewater treatment needs to find an excellent and effective low-carbon water purification method.

[0003] Alginate is a component of seaweed plants, has natural biocompatibility and biodegradability, and has excellent moisture absorption and heavy metal adsorption properties. Alginate fibers prepared from marine biological materials are an important part of the bio-manufacturing industry, and their environmental friendly properties are of great significance for replacing fossil resources, developing circular economy, and building a resource-saving and environment-friendly society. Therefore, to enhance the adsorption performance of heavy metal ions of calcium alginate fibers (CA), the present application proposes a new surface treatment method.

[0004] Hyperbranched polymers (HBP) are a class of highly branched three-dimensional dendrimer materials different from linear polymers, with many branching points, molecular chains not easy to entangle, and viscosity not changing with the increase of molecular weight, also with rich terminal functional groups. The amino-terminated hyperbranched polymer (HBP-NH2) is a quasi-spherical structure polymer different from both linear polymer and general small molecule compound. The molecular surface of HBP-NH2 contains extremely rich amino, imine and tertiary amine groups, making it an excellent amino modifier. It has been widely used in coating, nanotechnology, additive and biomaterial fields. Due to its rich amino functional groups, it can produce 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. The modified calcium alginate fiber heavy metal adsorption material is prepared by using glutaraldehyde and hyperbranched polymer as main raw materials. The adsorption capacity of the modified calcium alginate fiber before and after modification is greatly improved, but the preparation method has large raw material consumption, causing waste and high production cost. In addition, the calcium alginate fiber is not easy to process, and the modification method directly drops the hyperbranched polymer into the solution containing glutaraldehyde (GA), so that the hyperbranched polymer directly reacts with glutaraldehyde in the solution, reducing the effective reaction rate on the fiber, and a large amount of invalid reaction products are attached to the surface of the calcium alginate fiber, which reduces the adsorption performance of the original fiber. SUMMARY

[0005] In view of the deficiencies in the prior art, the present application provides a preparation method of amino-modified calcium alginate fiber non-woven fabric, which is simple to operate, good in stability, low in cost, low in operation condition requirement, and conducive to large-scale industrialized production. Another object of the present application is to provide an amino-modified calcium alginate fiber non-woven fabric with excellent heavy metal lead ion adsorption capacity.

[0006] In order to achieve the above object, the present application adopts the following technical scheme: the preparation method of the amino-modified calcium alginate fiber non-woven fabric comprises the following steps: step 1, soaking the calcium alginate fiber non-woven fabric in a glutaraldehyde aqueous solution after water washing 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 step 1; step 3, soaking the glutaraldehyde grafted calcium alginate fiber non-woven fabric in an amino-terminated hyperbranched polymer solution to obtain an amino-modified calcium alginate fiber non-woven fabric; and step 4, drying the amino-modified calcium alginate fiber non-woven fabric obtained in step 3.

[0007] Further, the water washing in step 1 is ultrasonic water washing with deionized water.

[0008] Further, the concentration of the aqueous solution of glutaraldehyde in step 1 is 5wt%-10wt%.

[0009] Further, the reaction temperature in step 1 is 50-60℃, and the reaction time is 1 hour.

[0010] Further, the mass ratio of the calcium alginate fiber non-woven fabric to glutaraldehyde in step 1 is 1:1-1:10.

[0011] Further, the concentration of the solution of the amino-terminated hyperbranched polymer in step 3 is 0.1-2g / L.

[0012] Further, the mass ratio of the calcium alginate fiber non-woven fabric to the solution of the amino-terminated hyperbranched polymer in step 3 is 1:1-1:40.

[0013] Further, the reaction temperature in step 3 is 50-60℃, and the reaction time is 30-60min.

[0014] Further, the drying treatment in steps 2 and 4 is extrusion by an extrusion roller.

[0015] The above preparation method obtains an amino-modified calcium alginate fiber non-woven fabric.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] (1) The carrier used in the present application is a non-woven fabric of seaweed fibers, which effectively avoids the difficulty in processing the modified fibers, and at the same time, the non-woven fabric is strong but not compact, and has good mechanical properties and no effect on full reaction;

[0018] (2) The preparation method of the present application is low in cost and energy consumption. The medium required in the reaction process is an aqueous solution, which is green, non-toxic, low in cost and beneficial to industrial production; the required temperature range in the reaction process is relatively low, at 50-60℃, which reduces energy consumption and production cost; the reaction time is short, each step is 30-60min, the process steps are simple, and the energy consumption is low; no hot air drying is required, only extrusion drying by a roller is needed, which not only avoids high energy consumption of hot air, but also avoids the increase in hardness and brittleness of the non-woven fabric and the decrease in adsorption performance caused by hot air drying;

[0019] (3) This invention can effectively improve adsorption performance. By improving the targeting of the grafting reaction, it avoids the fact that most of the added terminal amino hyperbranched polymer is consumed by the large amount of glutaraldehyde remaining in the solution, thus saving materials and avoiding the problem of a large amount of ineffective reaction products adhering to the surface of calcium alginate, which would reduce the adsorption performance. Compared with the prior art, the adsorption capacity of this invention is increased by 20% to 40%. Furthermore, the adsorption capacity limit of the prior art is less than 800 mg / g, while the adsorption capacity limit of this invention reaches 1100-1500 mg / g at a lead solution concentration of 2500 ppm. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the preparation process of the present invention. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the embodiments.

[0022] Example 1

[0023] A schematic diagram of the preparation method of amino-modified calcium alginate fiber nonwoven fabric is shown below. Figure 1 The process includes the following steps: Step 1: Prepare a 5wt% GA aqueous solution, immerse the CA nonwoven fabric in the GA aqueous solution to fully wet the surface of the CA nonwoven fabric, and perform surface chemical grafting modification treatment at 50℃ for 1 hour to achieve chemical linking of GA with the hydroxyl groups on the surface of calcium alginate fiber, thus obtaining CA-GA nonwoven fabric; Step 2: Perform roller extrusion drying treatment on the CA-GA nonwoven fabric to remove excess unreacted GA from the solution; Step 3: Prepare a 0.8g / L solution... The CA-GA nonwoven fabric is immersed in the HBP-NH2 aqueous solution to fully wet the surface of the CA-GA nonwoven fabric. Then, it is subjected to surface chemical grafting modification treatment at 50°C to achieve chemical linking of amino groups with aldehyde groups on the CA-GA surface, thus obtaining CA-GA-HBP-NH2 nonwoven fabric. Step 4: The CA-GA-HBP-NH2 nonwoven fabric is subjected to roller extrusion drying treatment to remove excess unreacted HBP-NH2 in the solution.

[0024] Example 2

[0025] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, preparing a GA aqueous solution with a concentration of 10 wt%, immersing the CA non-woven fabric in the GA aqueous solution, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and performing surface chemical grafting modification treatment on the CA non-woven fabric at 50 DEG C for 1 hour to realize chemical linkage of GA and the surface group -hydroxyl of the calcium alginate fiber, thereby obtaining the CA-GA non-woven fabric; step 2, performing pressure roller extrusion drying treatment on the CA-GA non-woven fabric to remove the excess unreacted GA in the solution; step 3, preparing an HBP-NH2 aqueous solution with a concentration of 0.8 g / L, immersing the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, fully wetting the surface of the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, and performing surface chemical grafting modification treatment on the CA-GA non-woven fabric at 50 DEG C to realize chemical linkage of the amino group and the surface group -aldehyde group of the CA-GA, thereby obtaining the CA-GA-HBP-NH2 non-woven fabric; and step 4, performing pressure roller extrusion drying treatment on the CA-GA-HBP-NH2 non-woven fabric to remove the excess unreacted HBP-NH2 in the solution.

[0026] Example 3

[0027] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, preparing a GA aqueous solution with a concentration of 5 wt%, immersing the CA non-woven fabric in the GA aqueous solution, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and performing surface chemical grafting modification treatment on the CA non-woven fabric at 60 DEG C for 1 hour to realize chemical linkage of GA and the surface group -hydroxyl of the calcium alginate fiber, thereby obtaining the CA-GA non-woven fabric; step 2, performing pressure roller extrusion drying treatment on the CA-GA non-woven fabric to remove the excess unreacted GA in the solution; step 3, preparing an HBP-NH2 aqueous solution with a concentration of 0.8 g / L, immersing the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, fully wetting the surface of the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, and performing surface chemical grafting modification treatment on the CA-GA non-woven fabric at 50 DEG C to realize chemical linkage of the amino group and the surface group -aldehyde group of the CA-GA, thereby obtaining the CA-GA-HBP-NH2 non-woven fabric; and step 4, performing pressure roller extrusion drying treatment on the CA-GA-HBP-NH2 non-woven fabric to remove the excess unreacted HBP-NH2 in the solution.

[0028] Example 4

[0029] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, preparing a GA aqueous solution with a concentration of 5 wt%, immersing the CA non-woven fabric in the GA aqueous solution, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and performing surface chemical grafting modification treatment on the CA non-woven fabric at 50 DEG C for 30 min, so as to realize chemical linking of GA and the surface group -hydroxyl of the calcium alginate fiber, thereby obtaining the CA-GA non-woven fabric; step 2, performing pressure roller extrusion drying treatment on the CA-GA non-woven fabric, and removing the excess unreacted GA in the solution; step 3, preparing an HBP-NH2 aqueous solution with a concentration of 0.8 g / L, immersing the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, fully wetting the surface of the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, and performing surface chemical grafting modification treatment on the CA-GA non-woven fabric at 50 DEG C, so as to realize chemical linking of the amino group and the surface group -aldehyde group of the CA-GA, thereby obtaining the CA-GA-HBP-NH2 non-woven fabric; and step 4, performing pressure roller extrusion drying treatment on the CA-GA-HBP-NH2 non-woven fabric, and removing the excess unreacted HBP-NH2 in the solution.

[0030] Example 5

[0031] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, preparing a GA aqueous solution with a concentration of 5 wt%, immersing the CA non-woven fabric in the GA aqueous solution, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and performing surface chemical grafting modification treatment on the CA non-woven fabric at 50 DEG C for 30 min, so as to realize chemical linking of GA and the surface group -hydroxyl of the calcium alginate fiber, thereby obtaining the CA-GA non-woven fabric; step 2, performing pressure roller extrusion drying treatment on the CA-GA non-woven fabric, and removing the excess unreacted GA in the solution; step 3, preparing an HBP-NH2 aqueous solution with a concentration of 0.8 g / L, immersing the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, fully wetting the surface of the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, and performing surface chemical grafting modification treatment on the CA-GA non-woven fabric at 50 DEG C, so as to realize chemical linking of the amino group and the surface group -aldehyde group of the CA-GA, thereby obtaining the CA-GA-HBP-NH2 non-woven fabric; and step 4, performing pressure roller extrusion drying treatment on the CA-GA-HBP-NH2 non-woven fabric, and removing the excess unreacted HBP-NH2 in the solution.

[0032] Example 6

[0033] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, preparing a GA aqueous solution with a concentration of 5 wt%, immersing the CA non-woven fabric in the GA aqueous solution, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and performing surface chemical grafting modification treatment at 50 DEG C for 1 hour to realize chemical linkage of GA and surface groups -hydroxyl of the calcium alginate fiber, thereby obtaining the CA-GA non-woven fabric; step 2, performing pressure roller extrusion drying treatment on the CA-GA non-woven fabric to remove excess unreacted GA in the solution; step 3, preparing an HBP-NH2 aqueous solution with a concentration of 0.8 g / L, immersing the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, fully wetting the surface of the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, and performing surface chemical grafting modification treatment at 60 DEG C to realize chemical linkage of amino and surface groups -aldehyde of the CA-GA, thereby obtaining the CA-GA-HBP-NH2 non-woven fabric; and step 4, performing pressure roller extrusion drying treatment on the CA-GA-HBP-NH2 non-woven fabric to remove excess unreacted HBP-NH2 in the solution.

[0034] Comparative Example 1

[0035] The calcium alginate fiber non-woven fabric is washed with deionized water by ultrasonic.

[0036] Comparative Example 2

[0037] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, preparing a GA aqueous solution with a concentration of 5 wt%, immersing the CA non-woven fabric in the GA aqueous solution, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and performing surface chemical grafting modification treatment at 50 DEG C for 1 hour to realize chemical linkage of GA and surface groups -hydroxyl of the calcium alginate fiber, thereby obtaining the CA-GA non-woven fabric; step 2, preparing an HBP-NH2 aqueous solution with a concentration of 0.8 g / L, and dropping the HBP-NH2 aqueous solution into the solution system of step 1; and step 3, performing pressure roller extrusion drying treatment on the CA-GA-HBP-NH2 non-woven fabric to remove excess unreacted HBP-NH2 in the solution.

[0038] Comparative Example 3

[0039] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, preparing a GA aqueous solution with a concentration of 5 wt%, immersing the CA woven fabric in the GA aqueous solution, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and performing surface chemical grafting modification treatment on the CA non-woven fabric at 50 DEG C for 1 hour to realize chemical linkage of GA and the surface group -hydroxyl of the calcium alginate fiber, thereby obtaining the CA-GA non-woven fabric; step 2, performing hot air drying treatment on the CA-GA non-woven fabric; step 3, preparing an HBP-NH2 aqueous solution with a concentration of 0.8 g / L, immersing the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, fully wetting the surface of the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, and performing surface chemical grafting modification treatment on the CA-GA non-woven fabric at 50 DEG C to realize chemical linkage of the amino group and the surface group -aldehyde group of the CA-GA, thereby obtaining the CA-GA-HBP-NH2 non-woven fabric; and step 4, performing pressure roller extrusion drying treatment on the CA-GA-HBP-NH2 non-woven fabric to remove the excess unreacted HBP-NH2 in the solution.

[0040] Comparative Example 4

[0041] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, preparing a GA aqueous solution with a concentration of 5 wt%, immersing the CA woven fabric in the GA aqueous solution, fully wetting the surface of the CA non-woven fabric in the GA aqueous solution, and performing surface chemical grafting modification treatment on the CA non-woven fabric at 50 DEG C for 1 hour to realize chemical linkage of GA and the surface group -hydroxyl of the calcium alginate fiber, thereby obtaining the CA-GA non-woven fabric; step 2, performing hot air drying treatment on the CA-GA non-woven fabric; step 3, preparing an HBP-NH2 aqueous solution with a concentration of 0.8 g / L, immersing the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, fully wetting the surface of the CA-GA non-woven fabric in the HBP-NH2 aqueous solution, and performing surface chemical grafting modification treatment on the CA-GA non-woven fabric at 50 DEG C to realize chemical linkage of the amino group and the surface group -aldehyde group of the CA-GA, thereby obtaining the CA-GA-HBP-NH2 non-woven fabric; and step 4, performing pressure roller extrusion drying treatment on the CA-GA-HBP-NH2 non-woven fabric to remove the excess unreacted HBP-NH2 in the solution.

[0042] Comparative Example 5

[0043] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, the CA non-woven fabric is soaked in a GA aqueous solution with a concentration of 5 wt%, the surface of the CA non-woven fabric is fully wetted in the GA aqueous solution, and the surface chemical grafting modification treatment is performed on the CA non-woven fabric at 30 DEG C for 1 hour, so that the chemical linkage between GA and the surface group -hydroxyl of the calcium alginate fiber is realized, and the CA-GA non-woven fabric is obtained; step 2, the CA-GA non-woven fabric is subjected to pressure roller extrusion drying treatment, and the excess unreacted GA in the solution is removed; step 3, an HBP-NH2 aqueous solution with a concentration of 0.8 g / L is prepared, the CA-GA non-woven fabric is soaked in the HBP-NH2 aqueous solution, the surface of the CA-GA non-woven fabric is fully wetted in the HBP-NH2 aqueous solution, and the surface chemical grafting modification treatment is performed on the CA-GA non-woven fabric at 30 DEG C, so that the chemical linkage between the amino group and the surface group -aldehyde group of the CA-GA is realized, and the CA-GA-HBP-NH2 non-woven fabric is obtained; and step 4, the CA-GA-HBP-NH2 non-woven fabric is subjected to pressure roller extrusion drying treatment, and the excess unreacted HBP-NH2 in the solution is removed.

[0044] Comparative Example 6

[0045] The amino-modified calcium alginate fiber non-woven fabric is prepared by the following steps: step 1, the CA non-woven fabric is soaked in a GA aqueous solution with a concentration of 5 wt%, the surface of the CA non-woven fabric is fully wetted in the GA aqueous solution, and the surface chemical grafting modification treatment is performed on the CA non-woven fabric at 30 DEG C for 1 hour, so that the chemical linkage between GA and the surface group -hydroxyl of the calcium alginate fiber is realized, and the CA-GA non-woven fabric is obtained; step 2, the CA-GA non-woven fabric is subjected to pressure roller extrusion drying treatment, and the excess unreacted GA in the solution is removed; step 3, an HBP-NH2 aqueous solution with a concentration of 0.8 g / L is prepared, the CA-GA non-woven fabric is soaked in the HBP-NH2 aqueous solution, the surface of the CA-GA non-woven fabric is fully wetted in the HBP-NH2 aqueous solution, and the surface chemical grafting modification treatment is performed on the CA-GA non-woven fabric at 30 DEG C, so that the chemical linkage between the amino group and the surface group -aldehyde group of the CA-GA is realized, and the CA-GA-HBP-NH2 non-woven fabric is obtained; and step 4, the CA-GA-HBP-NH2 non-woven fabric is subjected to pressure roller extrusion drying treatment, and the excess unreacted HBP-NH2 in the solution is removed.

[0046] The adsorption performance of Examples 1-6 and Comparative Examples 1-6 is detected, and the detection method specifically comprises: the non-woven fabric to be detected is placed in a triangular flask, a lead ion solution of 1000PPm is added, and adsorption is performed at 30 DEG C until adsorption equilibrium is reached. The lead ion adsorption amount per gram of material is calculated by ultraviolet spectrophotometer test. The lead ion adsorption amount of Examples 1-6 and Comparative Examples 1-6 is shown in Table 1.

[0047] Table 1 fabric lead ion adsorption capacity values

[0048] Adsorption capacity 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

[0049] From Table 1, it can be seen that, compared with Comparative Example 1, the surface treatment of the calcium alginate fiber non-woven fabric of the present application in Examples 1-6 effectively improves the adsorption capacity of the non-woven fabric for heavy metal lead ions.

[0050] Compared with Comparative Example 2, Example 1 does not directly add the amino-terminated hyperbranched polymer solution to the solution containing glutaraldehyde, which effectively avoids the direct reaction between the amino-terminated hyperbranched polymer and glutaraldehyde in the solution, reduces the ineffective reaction, improves the effective selective reaction between the amino-terminated hyperbranched polymer and the calcium alginate fiber, improves the effective use rate of the amino-terminated hyperbranched polymer, reduces material loss, reduces production cost, and effectively reduces the side reaction between the glutaraldehyde dialdehyde group and the amino-terminated hyperbranched polymer, avoiding the attachment of a large amount of side reaction products to the surface of the non-woven fabric and thus reducing the heavy metal lead ion adsorption performance of the non-woven fabric. The adsorption capacity in Comparative Example 2 is reduced by 24% compared with Example 1, and the possible reason is that a large amount of side reaction products between the glutaraldehyde dialdehyde group and the amino-terminated hyperbranched polymer are attached to the surface of the non-woven fabric.

[0051] Compared with Comparative Example 3, the adsorption capacity of Example 1 is lower, and the reason is that the fiber becomes hard and brittle during the hot air drying process, and the fiber morphology structure is changed during the humidification and drying process, which affects the grafting of the amino-terminated hyperbranched polymer and reduces the lead ion adsorption performance. The present application uses extrusion drying by extrusion roller, which effectively avoids the increase in fiber hardening brittleness during the hot air drying process and affects the next step reaction, and at the same time removes excess glutaraldehyde solution, improving the selectivity of the next step of grafting of the amino-terminated hyperbranched polymer on the fiber. In addition, the use of extrusion drying by extrusion roller effectively reduces energy consumption and production cost.

[0052] Compared with Example 1, the adsorption capacity in Comparative Example 4 is reduced, and the possible reason is that a large amount of excess amino-terminated hyperbranched polymer is attached to the surface of the calcium alginate non-woven fabric, reducing the effective adsorption and thus affecting the adsorption performance. At the same time, it shows that the preparation method of the present application does not require high concentration, which can save raw materials and reduce production cost.

[0053] Compared with Example 1, the reaction temperature of Comparative Example 5 is lower, and the adsorption capacity is also lower; compared with Example 1, the reaction temperature of Comparative Example 6 is higher, but the adsorption capacity is also lower, which shows that the preparation method of the present application does not require high reaction temperature, which can reduce energy consumption and production cost.

Claims

1. A process for the production of amino-modified calcium alginate fiber nonwoven fabric, characterized by, The method comprises the following steps: Step 1, soaking the calcium alginate fiber nonwoven fabric in a water solution of glutaraldehyde after water washing to obtain a glutaraldehyde grafted calcium alginate fiber nonwoven fabric; Step 2, drying the glutaraldehyde grafted calcium alginate fiber nonwoven fabric obtained in step 1; Step 3, soaking the glutaraldehyde grafted calcium alginate fiber nonwoven fabric in an amino-terminated hyperbranched polymer solution to obtain an amino-modified calcium alginate fiber nonwoven fabric; Step 4, drying the amino-modified calcium alginate fiber nonwoven fabric obtained in step 3; The concentration of the amino-terminated hyperbranched polymer solution in step 3 is 0.1-2 g / L; The drying treatment in steps 2 and 4 is extrusion by an extrusion roller.

2. The process for the production of amino-modified calcium alginate fiber nonwoven fabric according to claim 1, characterized in that, The water washing in step 1 is ultrasonic water washing with deionized water.

3. The method for preparing an amino-modified calcium alginate fiber nonwoven fabric according to claim 1, characterized by, The concentration of the water solution of glutaraldehyde in step 1 is 5 wt%-10 wt%.

4. The method for preparing an amino-modified calcium alginate fiber nonwoven fabric according to claim 1, characterized by, The reaction temperature in step 1 is 50-60℃, and the reaction time is 1 hour.

5. The method for preparing an amino-modified calcium alginate fiber nonwoven fabric according to claim 1, characterized by, The mass ratio of the calcium alginate fiber nonwoven fabric to glutaraldehyde in step 1 is 1:1-1:

10.

6. The method for preparing an aminomodified calcium alginate fiber nonwoven fabric according to claim 1, characterized by, The mass ratio of the calcium alginate fiber nonwoven fabric to the amino-terminated hyperbranched polymer solution in step 3 is 1:1-1:

40.

7. The method for preparing an aminomodified calcium alginate fiber nonwoven fabric according to claim 1, characterized by, The reaction temperature in step 3 is 50-60℃, and the reaction time is 30-60 min.

8. An amino-modified calcium alginate fiber nonwoven fabric prepared by the method of any one of claims 1-7.

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