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 de

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

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

Example Embodiment

[0020] Example 2

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

Example Embodiment

[0022] Example 3

[0023] First, weigh 2.2 kg of wheat stalks, put them in a chipper, and perform chipping treatment, screen out 3cm long and 0.7cm wide scraps, put the obtained scraps into 3L of 7% NaOH solution by mass concentration, and start stirring After stirring at 500r / min for 4h, filter to obtain the filter residue; then add the above-obtained filter residue into a closed reactor, set the stirring speed to 700r / min, and pour saturated steam into the reactor until the inside of the reactor When the pressure reaches 2.3 MPa, keep the pressure for 17 minutes, open the valve at the bottom of the reactor to spray the materials in the reactor into the receiving container; then take out the materials in the receiving container, freeze them with liquid nitrogen for 7 minutes, and then quickly transfer them to the ball mill and press the ball The material ratio is 1:45, add ball milling beads, and after ball milling for 35 minutes, collect the material obtained from ball milling ...

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PUM

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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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