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Preparation method of natural fiber compounded magnetic hydrogel

A technology of composite magnetic and natural fibers, applied in the direction of magnetism of organic materials/organic magnetic materials, can solve the problems of easy cracking, high magnetic strength, poor mechanical properties, etc., and achieve simple preparation steps, good tensile strength, and magnetic strength. high effect

Inactive Publication Date: 2016-09-07
高大元
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the problem that the hydrogels artificially synthesized with polymer materials as raw materials generally have poor mechanical properties, are easy to break, and cannot reach the required mechanical strength index, a solution using sodium hydroxide solution is provided. Soaking weakens the bonding force between fibers, and then uses steam explosion treatment to decompose wheat straw fibers into monomer fibers and fiber bundles, and then rapidly cools them with liquid nitrogen to freeze the decomposed fibers after blasting, and breaks into nanoscale after ball milling Fiber, and then use the polyhydric properties of the surface of the nano-scale fiber to produce chemical bonds and physical adsorption with the magnetized nano-ferric oxide crystal, and obtain a uniformly distributed natural fiber composite magnetic hydrogel after ultrasonic dispersion and freezing treatment. The natural fiber composite magnetic hydrogel prepared by the invention has high magnetic strength, which can reach 46.6-47.8emu / g, and has good tensile strength and is not easy to break

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] First weigh 2.5kg of wheat straw, put it into a chipper, and carry out chipping treatment, screen out the scraps with a length of 4cm and a width of 1.0cm, put the obtained scraps into 4L of a mass concentration of 8%NaOH solution, and start stirring After stirring for 5 hours at a speed of 600r / min, filter to obtain a filter residue; then add the filter residue obtained above into a closed reaction kettle, set the stirring speed at 800r / min, and feed saturated water vapor into the reaction kettle until the reaction kettle When the pressure reaches 2.4MPa, keep the pressure for 20 minutes, open the valve at the bottom of the reactor, and spray the material in the reactor into the receiving container; then take out the material in the receiving container, freeze it with liquid nitrogen for 10 minutes, and quickly transfer it to the ball mill, press the ball The material ratio is 1:50, add ball milling beads, and after ball milling for 40 minutes, collect the materials obt...

example 2

[0021] First weigh 2.0kg of wheat straw, put it into the chipper, and carry out chipping treatment, screen out the scraps with a length of 2cm and a width of 0.5cm, put the obtained scraps into 3L of 6% NaOH solution, and start stirring After stirring at a speed of 400r / min for 3 hours, filter to obtain a filter residue; then add the filter residue obtained above into a closed reaction kettle, set the stirring speed at 600r / min, and feed saturated water vapor into the reaction kettle until the reaction kettle When the pressure reaches 2.2MPa, keep the pressure for 15 minutes, open the valve at the bottom of the reactor, and spray the material in the reactor into the receiving container; then take out the material in the receiving container, freeze it with liquid nitrogen for 5 minutes, and quickly transfer it to the ball mill, press the ball The material ratio is 1:40, add ball milling beads, and after ball milling for 30 minutes, collect the material obtained by ball milling a...

example 3

[0023] First weigh 2.2kg of wheat straw, put it into a chipper, and carry out chipping treatment, screen out the scraps with a length of 3cm and a width of 0.7cm, put the obtained scraps into 3L of 7% NaOH solution, and start stirring After stirring for 4 hours at a speed of 500r / min, filter to obtain a filter residue; then add the filter residue obtained above into a closed reaction kettle, set the stirring speed at 700r / min, and feed saturated water vapor into the reaction kettle until the reaction kettle When the pressure reaches 2.3MPa, keep the pressure for 17 minutes, open the valve at the bottom of the reactor, and spray the material in the reactor into the receiving container; then take out the material in the receiving container, freeze it with liquid nitrogen for 7 minutes, and quickly transfer it to the ball mill, press the ball The material ratio is 1:45, add ball milling beads, and after ball milling for 35 minutes, collect the materials obtained by ball milling an...

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Abstract

The invention relates to a preparation method of natural fiber compounded magnetic hydrogel, and belongs to the technical field of hydrogel preparation. Soaking by a sodium hydroxide solution is used for weakening the bonding force among fibers; then, steam blasting treatment is used, so that straw fibers are decomposed into monomer fibers and fiber bundles; then, liquid nitrogen is used for fast cooling, so that the fibers subjected to blasting decomposition are frozen; through ball milling treatment, the fibers are broken into nano-scale fibers; then, a polyhydroxyl characteristic of the surfaces of the nano-scale fibers is used; chemical bonds and physical adsorption are formed with magnetized nanometer ferroferric oxide crystals; through ultrasonic dispersion and freezing treatment, the natural fiber compounded magnetic hydrogel in uniform distribution is obtained. The natural fiber compounded magnetic hydrogel prepared by the method has the advantages that the magnetic intensity is high, and can reach 46.6 to 47.8 emu / g; the stretching intensity is good, and can reach 630 to 720kPa.

Description

technical field [0001] The invention relates to a preparation method of natural fiber composite magnetic hydrogel, belonging to the technical field of hydrogel preparation. Background technique [0002] Magnetic hydrogels can exhibit various deformations such as elongation, contraction, or bending under the action of a magnetic field, but the network structure of the gel will not be damaged. Magnetic gels have unique flexibility and permeability in targeted drug release, It has a wide range of applications in cell separation and labeling, protein adsorption and separation. Due to its good biocompatibility and sensitivity to external stimuli, intelligent hydrogels synthesized from natural polymers are widely used in chemical converters, chemical memories, memory switches, sensors, artificial muscles, enzyme immobilization, and tissue engineering. , drug release, and molecular separation systems have good application prospects. Compared with ordinary hydrogels, natural polyme...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L97/02C08K3/22H01F1/42
CPCC08J3/075C08J2397/02C08K3/22C08K2003/2275C08K2201/011H01F1/42
Inventor 高大元薛培龙许博伟
Owner 高大元
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