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Method for preparing foamy high water absorption resin

A super absorbent resin, foam-like technology, applied in the field of foam resin preparation, can solve the problems of low porosity of super absorbent resin, difficult to achieve large-scale production, environmental pollution, etc., so as to improve gelatinization efficiency and reduce air pollution. and safety risks, the effect of reducing the cross-linking time

Inactive Publication Date: 2011-04-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Defects of the technology adopted in the above literature: the method of preparing superabsorbent resin using carbonate and ammonium salt as foaming agent will release ammonia gas during the process, causing environmental pollution and potential safety hazards
The prepared superabsorbent resin has low porosity and small water absorption, which may be related to the residue of carbonate and ammonium salt added, and it is difficult to achieve large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare starch solution with 6g of amylopectin and 72g of water, gelatinize at 120°C for 1.6min, add 0.18g of potassium persulfate and acrylic acid monomer, the monomer is passed through a sodium hydroxide solution with a mass fraction of 25%. And, with a neutralization degree of 80%, stir the reaction for 30 minutes, and cool to 60°C with nitrogen gas at the same time, then add 0.06g of N,N'-methylenebisacrylamide, gradually stop stirring, and carry out cross-linking reaction in a constant temperature water bath at 65°C .

[0031] When the cross-linking reaction is carried out for 10 minutes, the product is directly put into a microwave ceramic container or directly irradiated with microwaves. The foaming frequency is 2450MHz, the power is 560W, and the time is 1min. A foamy superabsorbent resin is produced. The water absorption rate is 846g / g. The water absorption rate in the first ten minutes is 768g / g; the water absorption rate for fire fighting wastewater is 156g / g...

Embodiment 2

[0033] Prepare starch solution with 6g of amylopectin and 72g of water, gelatinize in the range of 100°C for 2.0min, add 0.18g of potassium persulfate and acrylic acid monomer, the monomer is passed through a sodium hydroxide solution with a mass fraction of 25%. And, with a neutralization degree of 80%, stir the reaction for 30 minutes, and cool to 60°C with nitrogen gas at the same time, then add 0.06g of N,N'-methylenebisacrylamide, gradually stop stirring, and carry out cross-linking reaction in a constant temperature water bath at 65°C .

[0034] When the cross-linking reaction is carried out for 10 minutes, the product is directly put into a microwave ceramic container or directly irradiated with microwaves. The foaming frequency is 2450MHz, the power is 280W, and the time is 3 minutes. A foamy superabsorbent resin is produced. The water absorption rate is 695g / g. The water absorption rate in the first ten minutes is 566g / g; the water absorption rate for fire fighting wa...

Embodiment 3

[0036] Prepare a starch solution with 6g of amylopectin and 60g of water, gelatinize at 100°C for 2.0min, add 0.18g of potassium persulfate and acrylic acid monomer, and the monomer is passed through a sodium hydroxide solution with a mass fraction of 25%. And, with a neutralization degree of 80%, stir the reaction for 30 minutes, and cool to 60°C with nitrogen gas at the same time, then add 0.06g of N,N'-methylenebisacrylamide, gradually stop stirring, and carry out cross-linking reaction in a constant temperature water bath at 65°C .

[0037] When the cross-linking reaction is carried out for 15 minutes, the product is directly put into a microwave ceramic container or directly irradiated with microwaves. The foaming frequency is 2450MHz, the power is 700W, and the time is 1min. A foamy superabsorbent resin is produced, and its water absorption rate is measured to be 774g / g. The water absorption rate in the first ten minutes is 611g / g; the water absorption rate for fire figh...

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Abstract

The invention provides a method for preparing foamy high water absorption resin, which comprises the following steps of: putting a product cross-linked for 10 to 30 minutes at the gelatinization reaction temperature of between 100 and 150 DEG C into a microwave ceramic container or directly irradiating the product by using microwave, and generating the foamy high water absorption resin under the conditions that the microwave frequency is 2,450MHz, the power is 280 to 700W and the time is 1 to 5 minutes, wherein the fire fighting waste water absorption of the foamed resin is improved by 44 percent, the water absorption rate is improved by 80 percent, and the resin can be used for field control of fire fighting waste water. The microwave foaming does not need a foaming agent so as not to produce harmful dangerous gas or produce environmental pollution and safety risks; and subsequent cross-linking reaction and drying are performed at the same time during foaming, so drying equipment is saved, and the method is easy to realize large-scale production.

Description

technical field [0001] The invention belongs to the research field of polymer water-absorbing swelling resin, in particular to a preparation method of foamy resin with high water absorption capacity and high water absorption rate. Background technique [0002] Superabsorbent resins are widely used in fields such as industry, agriculture, construction, horticulture, sanitation, etc., but have not been used for on-site control of fire-fighting wastewater. In recent years, it has been proposed to use foaming agents to prepare foamy resins to improve their water absorption properties. [0003] In the article "Preparation of New CMCTS-g-PAA Macroporous Superabsorbent Resin by Porogenic Method" by Chen Yu et al. 3 Prepare a carboxymethyl chitosan modified superabsorbent resin with macroporous structure as a porogen, and try to use ammonium persulfate directly as an initiator without adding an accelerator to ensure the uniformity of foaming, which simplifies the reaction process....

Claims

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Application Information

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IPC IPC(8): C08L51/02C08K5/20C08F251/00C08J9/00C08J3/28C08J3/24
Inventor 周迟骏卢潮陵
Owner NANJING UNIV OF TECH
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