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Method for synthesizing nano dispersible CMC-acrylic acid macromolecule absorbent resin

A polymer water-absorbing and synthetic method technology, applied in the field of polymer water-absorbing resin synthesis, can solve the problems of difficult heat dissipation, high viscosity of the polymerization system, and the molecular chains of the polymer water-absorbing resin are dispersed at a nanometer level. The production safety factor is high, the process flow is simple, and the effect of controlling the synthesis temperature

Inactive Publication Date: 2007-12-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Solution polymerization is easy to operate and has no environmental pollution, but the heat generated by the reaction is difficult to dissipate, and the viscosity of the polymerization system is too high, which is often difficult to carry out in a common reactor, and post-processing is very difficult
[0005] Usually, the CMC synthesized by the reverse phase suspension polymerization method—the molecular chain of the acrylic polymer water-absorbent resin cannot be dispersed after absorbing water, and it is a group-like aggregate (as shown in Figure 1), which cannot reach the nanometer level of the polymer water-absorbent resin. scattered specific purpose

Method used

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  • Method for synthesizing nano dispersible CMC-acrylic acid macromolecule absorbent resin

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Effect test

Embodiment 1

[0029] Add 2.6 liters of n-hexane in a small glass-lined kettle, CMC (carboxymethyl cellulose) 1kg, 0.62 liters of sulfate ester surfactant [the sulfate ester surfactant, such as: fatty alcohol polyoxyethylene ether Sulfate salt (abbreviation: AES), the molecular formula is R-O(CH 2 CH 2 O)nSO 3 Na], N, N methylenebisacrylamide 28g, ammonium persulfate 37g, feed nitrogen into the reactor for 15-30 minutes, start the mixer at 450 rpm, stir for 10-30 minutes, add acrylic acid Sodium aqueous solution (7kg of acrylic acid, 2.7kg of sodium hydroxide, and 7.6kg of water) was then kept at 400 rpm, raised to 60°C for 1 hour, and then heated to 70°C for 4 hours. After the reaction was completed. Cooling water is passed through the jacket of the reaction kettle to cool down to room temperature, and the reaction materials are released. Use a drying machine to separate unreacted substances such as n-hexane, and the separated substances can be reused. The finished product (nano dispers...

Embodiment 2

[0031] Add 3.2 liters of normal hexane, CMC (carboxymethyl cellulose) 1kg, 1.25 liters of sulfate ester surfactants in a small-sized glass-lined kettle [the sulfate ester surfactants, such as: fatty alcohol polyoxyethylene ether Sulfate salt (abbreviation: AES), the molecular formula is R-O(CH 2 CH 2 O)nSO 3 Na], N, N methylenebisacrylamide 14g, ammonium persulfate 26g, feed nitrogen into the reactor for 15-30 minutes, start the mixer at 450 rpm, stir for 10-30 minutes, add acrylic acid Sodium aqueous solution (7kg of acrylic acid, 2.7kg of sodium hydroxide, and 7.6kg of water) was then kept at 400 rpm, raised to 60°C for 1 hour, and then heated to 70°C for 4 hours. After the reaction was completed. Cooling water is passed through the jacket of the reaction kettle to cool down to room temperature, and the reaction materials are discharged. Use a drying machine to separate unreacted substances such as n-hexane, and the separated substances can be reused. The finished produc...

Embodiment 3

[0033] Add 3.8 liters of n-hexane, CMC (carboxymethyl cellulose) 1kg, and 1.85 liters of sulfate ester surfactants in a small glass-lined kettle [sulfate ester surfactants, such as: fatty alcohol polyoxyethylene ether sulfate Salt (abbreviation: AES), the molecular formula is R-O(CH 2 CH 2 O)nSO 3 Na], N, N methylenebisacrylamide 7g, ammonium persulfate 26g, feed nitrogen into the reactor for 15-30 minutes, start the mixer and keep it at 450 rpm for 10-30 minutes, add sodium acrylate aqueous solution (acrylic acid 7kg, sodium hydroxide 2.7kg, water 7.6kg) then keep at 400 rpm, heat up to 60°C for 1 hour, heat up to 70°C for 4 hours, after the reaction is over. Cooling water is passed through the jacket of the reaction kettle to cool down to room temperature, and the reaction materials are discharged. Use a drying machine to separate unreacted substances such as n-hexane, and the separated substances can be reused. The finished product (nano dispersible CMC—acrylic polymer ...

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Abstract

The present invention relates to process of synthesizing water absorbing polymer resin, and is especially process of synthesizing water absorbing nanometer dispersive CMC-acrylate polymer resin. The process includes the following steps: 1. preparing materials including acrylic acid 10-50 weight portions, sodium hydroxide 3-10 weight portions, water 8-20 weight portions, CMC 1-10 weight portions, N, N'-methylene biacrylamide 0.01-0.5 weight portion, ammonium persulfate 0.01-1 weight portion, normal hexane 20-200 weight portions and sulfuric ester type surfactant 10-100 weight portions; 2. reacting the materials in a reaction kettle with introduced nitrogen while stirring and heating to 60-70 deg.c for 4-6 hr; 3. cooling through leading water to the jacket of the reaction kettle, and discharging the resultant; and 4. drying to obtain the product. The water absorbing polymer resin may be dispersed homogeneously in water solution.

Description

technical field [0001] The invention relates to a method for synthesizing a polymer water-absorbing resin. Background technique [0002] In the prior art, the synthesis method of CMC—acrylic polymer water-absorbing resin mainly adopts methods such as solution polymerization and reverse suspension polymerization. [0003] The reverse-phase suspension polymerization method refers to adding an organic solvent and a suspending agent (surfactant) in a reaction vessel, and then adding a water-soluble initiator, a crosslinking agent, and an aqueous solution of a reaction monomer at a certain stirring speed, and the Under the action of gas and under certain temperature conditions, the method of chemical polymerization is carried out. [0004] Solution polymerization is easy to operate and has no environmental pollution, but it is difficult to dissipate the heat generated by the reaction, and the viscosity of the polymerization system is too high, which is often difficult to carry o...

Claims

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Application Information

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IPC IPC(8): C08F120/06C08F2/18C08F2/44C08F4/30
CPCY02P20/582
Inventor 王勇张联盟万涛邢凯华
Owner WUHAN UNIV OF TECH
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