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Process for preparing high hydroscopicity resin from polyacrylonitrile powder

A super absorbent resin, polyacrylonitrile powder technology, applied in the polymer field, can solve the problems of poor salt resistance and application limitations, and achieve the effects of good salt resistance, uniform particles, and fast water absorption rate

Inactive Publication Date: 2005-07-06
SINOPEC QILU CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cross-linked sodium polyacrylate superabsorbent resin can absorb dozens, hundreds or even thousands of times of water (generally deionized water), but only one-tenth of its water absorption when absorbing saline media such as saline Even lower, which shows that its salt resistance is poor, and most of the applications are saline media, which limits its application to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add polyacrylonitrile powder (dry-process acrylic fiber process product, Mn is about 30,000) 40g, solid sodium hydroxide 20g, deionized water 20ml, isobutylene in the 500ml four-neck flask equipped with stirrer, reflux condenser and thermometer. Alcohol 200ml, start stirring, begin to slowly heat up, be warmed up to about 95 ℃, material begins to boil. The hydrolysis reaction was carried out in a boiling state for 6 hours, and the reaction was stopped by cooling down. Filter out the solid material, and obtain a colorless or light yellow granular product with uniform particles after drying, with a particle size of about 200-300 μm. The water absorption of the product is 2400 times, and the absorption of normal saline is 160 times.

Embodiment 2-4

[0023] The operation method is the same as that in Example 1, except that the hydrolyzed raw materials used are waste dry powder produced by dry-process acrylic fiber device, dried dry powder from wet-process acrylic fiber device, and dried dry powder of high molecular weight polyacrylonitrile homopolymer obtained by emulsion polymerization. A colorless or light yellow granular product with uniform particles is obtained, and the water absorption times of the product are 2300 times, 2500 times and 3000 times respectively.

Embodiment 5-10

[0025] The operation method is the same as in Example 1, except that the alcohol compounds added are respectively methanol, ethanol, isopropanol, n-propanol, tert-amyl alcohol and n-octanol, and the hydrolysis temperature is the boiling temperature of the reaction medium. Obtain a colorless or light yellow granular product with uniform particles. The water absorption multiples of the product are 350 times, 620 times, 1500 times, 1850, 2600, 1800, respectively, and the salt water absorption multiples are 35 times, 60 times, 100 times, 120 times, 190 times, 125 times.

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Abstract

A process for producing high water absorption resin using polyacrylonitrile powder is provided. In the process, polyacrylonitrile powder, water, alcohols compound and hydrolytic reagent are heated up to a temperature under stirring action and dispersive hydrolytic reaction is carried out. After the hydrolytic reaction, the resin product is filtered out and dried, and the powdered or granular product is obtained. The water absorbing multiple and salt tolerance of the product can be improved greatly.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a process for preparing superabsorbent resins from polyacrylonitrile powders, and the prepared superabsorbent resins are suitable for physiological hygiene, agriculture, forestry and gardening, petrochemicals, crude oil exploitation, construction, Various fields such as papermaking, textile, printing and dyeing and waterproof materials. Background technique [0002] Superabsorbent resin is a functional polymer material with a wide range of applications, which can be used in many fields such as petroleum, chemical industry, construction, oil field, physiology, medical treatment, and agriculture, forestry and gardening. Superabsorbent resins are classified in terms of preparation methods, mainly including natural polymer grafted type (such as starch grafted acrylonitrile) and monomer synthetic type. Among them, synthetic superabsorbent resin ranks first b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/12C08F20/44
Inventor 李留忠王敏于元章李永华严婕卢晓
Owner SINOPEC QILU CO
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