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Modified nanocomposite lignin and preparation method thereof

A nano-composite, lignin technology, applied in the field of nano-composite lignin and its preparation, can solve the problems of insufficient water absorption, clay residue and the like

Inactive Publication Date: 2018-01-26
成都昂多生物技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhu et al. used clay as a polyacrylamide as a crosslinking agent, which has high resilience, but the polyacrylamide nanocomposite lignin prepared by using clay modified by sodium pyrophosphate as a crosslinking agent has insufficient water absorption. , at the same time, after the preparation of polyacrylamide nanocomposite lignin with high clay content, there will be some residual clay

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 1.5 grams of clay into 28 grams of deionized water solution, put it in a 150m1 beaker and stir for 2 hours. After the clay is completely dissolved in the water solution to form a uniform and stable solution, weigh 3 grams of acrylamide, add it to the beaker and continue stirring. At the same time, 0.03 g of potassium persulfate was weighed and dissolved in 2 g of deionized water, and 0.024 g of catalyst N,N,N',N-tetramethylethylenediamine was simultaneously added into the beaker, and stirred evenly to form a prepolymer solution.

[0025] Nitrogen gas was bubbled into the prepolymer solution for 30 minutes to remove residual oxygen in the solution. Then inject the solution into a glass tube with a length of 60 mm and a diameter of 5 mm, and keep it at 30° C. for 200 hours to react. The obtained nanocomposite lignin was immersed in the acrylamide monomer solution with a concentration of 1% by mass for 200 hours. After the gel is fully swollen, it is soaked in di...

Embodiment 2

[0032] Weigh 1.5 grams of clay and dissolve it in 28 grams of deionized water solution, put it in a 150m1 beaker and stir for 2 hours. After the clay is completely dissolved in the water solution to form a uniform and stable solution, weigh 3.0 grams of acrylamide, add it to the beaker and continue stirring. At the same time, 0.03 g of potassium persulfate was weighed and dissolved in 2 g of deionized water, and 0.024 g of catalyst was added into the beaker at the same time, and stirred evenly to form a prepolymer solution.

[0033] Nitrogen gas was bubbled into the prepolymer solution for 30 minutes to remove residual oxygen in the solution. Then inject the solution into a glass tube with a length of 60 mm and a diameter of 5 mm, keep at 30° C., and react for 120 hours. The obtained nano-composite lignin was immersed in a solution of acrylamide monomer with a concentration of 2% by mass for 200 hours. After the gel was fully swelled, it was soaked in distilled water and rinse...

Embodiment 3

[0040] Weigh 3.0 grams of clay and dissolve it in 28 grams of deionized water solution, put it in a 150m1 beaker and stir for 2 hours. After the clay is completely dissolved in the water solution to form a uniform and stable solution, weigh 6.0 grams of acrylamide and add it to the beaker to continue stirring. At the same time, 0.03 g of potassium persulfate was weighed and dissolved in 2 g of deionized water, and 0.024 g of catalyst was added into the beaker at the same time, and stirred evenly to form a prepolymer solution.

[0041] Nitrogen gas was bubbled into the prepolymer solution for 40 minutes to remove residual oxygen in the solution. Then inject the solution into a glass tube with a length of 60 mm and a diameter of 5 mm to keep at 30° C. and react for 100 hours. The obtained nanocomposite lignin was respectively immersed in a solution of 2% acrylamide monomer by mass percentage for 200 hours. After the gel is fully swollen, it is soaked in distilled water and rins...

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Abstract

The invention provides modified nanocomposite lignin and a preparation method thereof. The preparation method comprises the following steps: under the condition that the temperature is 25 to 35 DEG C,initiating free radical polymerization of a prepolymer solution for 120 to 200 hours; then putting polymerisate into an acrylamide aqueous solution and carrying out post treatment for 200 to 300 hours; the prepolymer solution is prepared from the following components in percentage by weight: 5 to 17 percent of monomer, 4 to 13 percent of cross-linking agent, 0.1 to 0.2 percent of initiator, 0.1 to 0.2 percent of catalyst and 75 to 90 percent of water. The nanocomposite lignin prepared by the method is adopted, acrylamide is used as a monomer, in-situ free radical polymerization and solvent post-treatment are performed, and finally nanocomposite gel is obtained. The method has the advantages that the technology is simple, clay residues in the polymer can be effectively removed and water absorption of the nanocomposite polyacrylamide lignin is also greatly improved.

Description

technical field [0001] The invention relates to a nanocomposite lignin and a preparation method thereof. Background of the invention [0002] High polymer lignin is a polymer with a three-dimensional network structure that can absorb a large amount of water and swell, and is generally formed by cross-linking hydrophilic homopolymers or copolymers. Lignin is insoluble in water, but can swell in water. [0003] In the past few decades, a large number of studies on environmentally sensitive and physiologically sensitive lignin have emerged, and the typical response of sensitive lignin is the change of lignin volume. This volume change is discontinuous, and using this stimuli-response property, lignin has been applied in the following aspects: in the chemical industry for separation; in medicine for the controlled release of drugs; in the mechanical industry for To make memory element switches, sensors, etc. [0004] However, because polymer lignin is generally formed by poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F2/44C08K3/34C08J3/075
Inventor 丁伟
Owner 成都昂多生物技术有限责任公司