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A kind of coal-based polymer hydrogel and preparation method thereof

A composite hydrogel and hydrogel technology, which is applied in the field of polymer materials, can solve problems such as environmental pollution, gaps in flexibility and mechanical strength, and weak bonding, and achieve improved environmental friendliness, high environmental friendliness, and stimulation of crops. The effect of growth

Active Publication Date: 2019-11-22
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, the main problems in the prior art are: (1) The hydrogel formed by the polymerization of traditional ethylene derivative monomers and crosslinking agents has uneven crosslinking density and low strength, and the resulting hydrogel does not have Self-healing ability, raw material source is limited, and the raw material itself is not degradable, which will bring environmental pollution problems; (2) The existing water-soluble natural polymer materials such as sodium alginate and other composite hydrogel preparation methods are based on acrylamide As a monomer, it is copolymerized with sodium alginate under the action of an initiator and a chemical cross-linking agent to obtain a composite hydrogel; (4) Existing coal-based polyacrylamide materials are mainly obtained by mixing coal powder with acrylamide, initiator, crosslinking agent, cellulose and water and then polymerizing. Because the coal base exists in the hydrogel in the form of particles, the combination with the polymer is weak, and the material strength is not good. Applications in this area are limited

Method used

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  • A kind of coal-based polymer hydrogel and preparation method thereof
  • A kind of coal-based polymer hydrogel and preparation method thereof
  • A kind of coal-based polymer hydrogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 100 g of low calorific value coal, put it in a 2500 ml beaker, add 1800 mL of 1.0 mol / L NaOH aqueous solution, and stir at room temperature for 36 h. The insoluble matter was removed by filtration, and then 6 mol / L HCl aqueous solution was slowly added dropwise to the filtrate until the pH was 3, filtered, the black solid was collected and placed in a drying oven, and dried at 105 °C to constant weight to obtain a coal-based polymer.

[0045] Dissolve 10.0 g of coal-based polymer in 19.0 g of deionized water, and add 1.0 mol / L NaOH solution to adjust the pH of the solution to 8-10. Add 1.0 g hydrogen peroxide and pre-react at 45°C for 2 h to obtain solution I.

[0046] 0.54 g of acrylic acid, 0.67 g of ferric chloride hexahydrate, 2.13 g of acrylamide and 0.12 g of potassium persulfate were sequentially added to 10.0 g of deionized water to obtain solution II. To solution II, add 1.5 g of solution I and mix. The mixture was stirred in an ice-water bath for 30 mi...

Embodiment 2

[0054] On the basis of Example 1, take 10.0 g of the coal-based polymer obtained in Example 1, dissolve it in 19.0 g of deionized water, add 1.0 mol / L NaOH solution to adjust the pH value of the solution to 8-10, add 1.0 g of hydrogen peroxide , and reacted at 55°C for 2 h to obtain solution Ⅰ.

[0055] Add 3.8 g of acrylamide and 0.085 g of potassium persulfate to 9.8 g of water to obtain solution II. To solution II, add 2.0 g of solution I and mix. The mixture was stirred in an ice-water bath for 30 min, and deoxygenated with nitrogen for 10 min. The mixture is then transferred into glass molds and sealed. Place in an oven at 50°C for 5 h. demoulding. The formed coal-based polymer-acrylamide composite hydrogel was soaked in a pH=3 ethanol-water mixed solution (made by mixing 1.5 mL of ethanol and 20 mL of water) for 20 h. The resulting coal-based polymer hydrogel has a tensile strength of 1.2 MPa and an elongation at break of 290%. When acrylic acid is 0, Fe 3+ When t...

Embodiment 3

[0058] On the basis of Example 1, 0.27 g of acrylic acid, 0.32 g of ferric chloride hexahydrate, 1.96 g of acrylamide and 0.17 g of potassium persulfate were added to 9.8 g of water to obtain solution II. To solution II, add 2.0 g of solution I obtained in Example 1, and mix. The mixture was stirred in an ice-water bath for 30 min, and deoxygenated with nitrogen for 10 min. The mixture is then transferred into glass molds and sealed. Place in an oven at 55°C for 5 h. demoulding. Soak the formed coal-based polymer-acrylamide composite hydrogel in an acetone-water mixed solution (made by mixing 0.5 mL of acetone and 20 mL of water) at pH=3 for 12 h. The resulting coal-based polymer hydrogel has a tensile strength of 4.5 MPa and an elongation at break of 120%.

[0059] For the tensile curve of the coal-based polymer hydrogel obtained in Example 3 of the present invention, see Figure 5 .

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Abstract

The invention belongs to the technical field of high molecular materials, and relates to coal-based polymer hydrogel and a preparation method thereof. The preparation method comprises the following steps: firstly, extracting a water-soluble high polymer from low calorific value coal by adopting an alkali dissolving and acid precipitation method; then adjusting the pH (Potential of Hydrogen) valueof a water-soluble high polymer water solution by utilizing an NaOH solution; then carrying out chemical modification on the water-soluble high polymer by utilizing hydrogen peroxide; introducing a peroxide group, capable of initiating polymerization, into the coal; then adding acrylamide, acrylic acid, an initiator and metal ions and polymerizing, wherein after polymerizing, an ion bond by the acrylic acid and the metal ions is formed; finally, immersing obtained hydrogel into a mixed solvent of an organic solvent and water to form a physical cross-linking point by the hydrogel and further improve the strength thereof, so as to obtain the high-strength coal-based polymer hydrogel. According to the coal-based polymer hydrogel and the preparation method thereof, the low calorific value coalis used as a raw material, and has an abundant source, a low price and a high environment-friendly degree; in a polymerizing process, a chemical cross-linking agent is not used, so that the strengthof the hydrogel reaches grade MPa, and an application field of a hydrogel material is widened.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a hydrogel material, in particular to a coal-based polymer hydrogel and a preparation method thereof. Background technique [0002] Polymer materials are also called polymer materials. In addition to polymers as the basic components, in order to improve processing performance and performance, often add a variety of additives or additives. Polymer hydrogel usually refers to a kind of material between liquid and solid formed by the three-dimensional network structure formed by polymer crosslinking to absorb solvent swelling but not to dissolve. As a kind of "soft material" that has attracted much attention, because its network usually contains a large amount of water, it has the characteristics of changing its shape or state with the external environment, so that it can absorb, desorb, and permeate substances. , that is, it has the functions of carrying, separating, and sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/56C08F220/06C08H7/00
CPCC08F289/00C08H6/00C08F220/56
Inventor 雒春辉勉志鹏
Owner BEIFANG UNIV OF NATITIES
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