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Preparation method of straw-based superabsorbent resin with semi-interpenetrating network structure

A technology of superabsorbent resin and straw, which is applied in the chemical and environmental fields, can solve the problems of low strength, poor salt resistance and poor environmental friendliness, and achieve the effects of improving product strength, good water absorption, and wide sources

Inactive Publication Date: 2014-10-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low strength, poor salt resistance and environmental friendliness of superabsorbent resin products in the prior art, the present invention provides a semi-interpenetrating network with simple operation, good liquid absorption capacity, good salt resistance and high strength Preparation method of straw-based superabsorbent resin with structure

Method used

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  • Preparation method of straw-based superabsorbent resin with semi-interpenetrating network structure
  • Preparation method of straw-based superabsorbent resin with semi-interpenetrating network structure
  • Preparation method of straw-based superabsorbent resin with semi-interpenetrating network structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1. Preparation of straw-based superabsorbent resin with semi-interpenetrating network structure

[0030] (1) Wash the wheat straw and dry it at 70±5°C, then crush it and pass it through a 100-mesh sieve, and collect the sieved straw powder for later use;

[0031] (2) Soak the collected straw powder in ammonia water with a concentration of 10wt% for 48±5 hours, wherein the mass ratio of straw and ammonia water is 1:12, then suction filter and wash with water, and collect when the washed water is colorless Powder and dry at 70±5°C;

[0032] (3) Take the straw powder dried in step (2), treat it in 1mol / L nitric acid solution at 100±2°C for 45±5min, then filter it with suction and wash it with water until the washed water is colorless Collect the powder and dry it at 70±5°C; grind the dried powder with a mortar, pass through a 100-mesh sieve, and collect it for later use;

[0033] (4) Take 12ml of acrylic acid in a beaker, add 20ml of 6mol / L KOH solution to neutra...

Embodiment 2

[0036] Example 2. Preparation of straw-based superabsorbent resin with semi-interpenetrating network structure

[0037] As described in Example 1, the difference was that the amount of polyvinyl alcohol was changed: 20 ml of polyvinyl alcohol solution (concentration 60 mg / L) was added, and the reaction was stirred at 50° C. for 45 min. All the other operations, consumption are identical with embodiment 1.

[0038] It is determined that the obtained straw-based superabsorbent resin with a semi-interpenetrating network structure can reach a maximum water absorption rate of 225.12g / g, and a maximum salt water absorption rate of 23.64g / g.

Embodiment 3

[0039] Example 3. Preparation of straw-based superabsorbent resin with semi-interpenetrating network structure

[0040] As described in Example 1, the difference is that the reaction temperature has been changed:

[0041] Take 1.00 g of the straw powder obtained in step (3) and place it in a three-necked flask, add 10 ml of potassium persulfate solution (20 mg / L), and 4 ml of cerium ammonium nitrate solution (10 mg / L), and stir and react at 70 ° C for 15 min; Add 3.3ml of sodium sulfite solution (20mg / L) and 25.3ml of acrylic acid solution with a neutralization degree of 65% into the three-necked flask. After 15 minutes, add 33.3ml of polyvinyl alcohol solution (60mg / L), and stir and react at 70°C for 45 minutes; Add 2ml of N,N'-methylenebisacrylamide solution (20mg / L) into the three-necked flask, and stir the reaction at 70°C for 4h. All the other operations, consumption are identical with embodiment 1.

[0042] It is determined that the obtained straw-based superabsorbent ...

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Abstract

The invention relates to a preparation method of a straw-based high-water-absorption resin with a semi-interpenetrating network structure. The preparation method comprises the following steps of: based on wheat straw as a raw material, acrylic acid as a monomer, and polyvinyl alcohol as a crosslinked polymer, carrying out graft copolymerization under the effect of potassium persulfate, ammonium ceric nitrate, sodium sulfite composite initiator and cross-linking agent to form into a three-dimensional network polymer, and interpenetrating with crosslinked polymer polyvinyl alcohol to obtain the high-water-absorption resin with the semi-interpenetrating network structure. The high-water-absorption resin prepared by the method is very good in liquid absorbency and salt resistance, high in strength, low in cost, and simple and convenient in production process, thereby being widely applicable to agricultural water conservation.

Description

technical field [0001] The invention relates to a preparation method of a straw-based superabsorbent resin with a semi-interpenetrating network structure, which is a functional material synthesized from treated straw, acrylic acid and polyvinyl alcohol as main raw materials. It belongs to the field of chemical and environmental technology. Background technique [0002] Super absorbent resin was first successfully developed by the Northern Research Institute of the United States Department of Agriculture in 1969. It is a new type of functional polymer material developed for more than 40 years. It is able to absorb and maintain hundreds of times or even thousands of times its own weight. Polymers are often called super absorbents. At present, it has been widely used in agriculture, forestry, medicine, biology, building materials and other fields. In the application of agriculture and forestry, superabsorbent resin is undoubtedly an effective new way in the research hotspots ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/06C08L51/00C08L29/04C09K17/32C09K101/00
Inventor 李倩刘佳苏园岳钦艳高宝玉
Owner SHANDONG UNIV
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