Preparation method of straw-based super absorbent resin with nitrogen phosphorus fertilizer slow-release function

A technology of slow-release nitrogen-phosphorus fertilizer and superabsorbent resin, which is applied in the chemical and environmental fields, can solve the problems of low strength, poor salt tolerance and poor environmental friendliness, and achieve the effects of low cost, simple and convenient production process, and high water retention

Inactive Publication Date: 2014-10-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low strength, poor salt tolerance and poor environmental friendliness of superabsorbent resin products with the function of slow-release fertilizer in the prior art, the present invention provides an environmentally friendly superabsorbent resin with dual functions of water retention and fertilizer retention preparation method, especially a preparation method of straw-based superabsorbent resin with the function of slow-release nitrogen and phosphorus fertilizer

Method used

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  • Preparation method of straw-based super absorbent resin with nitrogen phosphorus fertilizer slow-release function
  • Preparation method of straw-based super absorbent resin with nitrogen phosphorus fertilizer slow-release function
  • Preparation method of straw-based super absorbent resin with nitrogen phosphorus fertilizer slow-release function

Examples

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Embodiment 1

[0041]A method for preparing a straw-based superabsorbent resin with the function of slow-release nitrogen and phosphorus fertilizers, the steps are as follows:

[0042] (1) After washing the wheat straw, dry it at 70±5°C, then crush it and pass it through a 100-mesh sieve, and collect the sieved straw powder for subsequent use;

[0043] (2) Soak the straw powder collected in step (1) in ammonia water with a concentration of 10wt% for 48±5 hours, wherein the mass ratio of straw powder and ammonia water is 1:12, suction filter, and wash the solid with water until the water is cleaned. Collect straw powder when it is colorless and dry it at 70±5°C;

[0044] (3) Take the straw powder dried in step (2), treat it in 1mol / L nitric acid solution at 100±2°C for 45±5min, filter it with suction, wash the solid with water until the washed water is colorless Collect the straw powder and dry it at 70±5°C; grind the dried straw powder with a mortar, pass through a 100-mesh sieve, and colle...

Embodiment 2

[0050] A method for preparing a straw-based superabsorbent resin with the function of slow-release nitrogen and phosphorus fertilizers. The preparation steps are the same as in Example 1, except that the amount of crosslinking agent is changed: adding 3ml of N,N'-sub- Methyl bisacrylamide solution, all the other operations, consumption are identical with embodiment 1.

[0051] It is determined that the maximum water absorption rate of the obtained superabsorbent resin can reach 175.05g / g, and the maximum salt water absorption rate can reach 22.15g / g.

Embodiment 3

[0053] A method for preparing a straw-based superabsorbent resin with the function of slow-release nitrogen and phosphorus fertilizers, the steps are as follows:

[0054] (1) drying the wheat straw after cleaning, pulverizing, passing through a 100-mesh sieve, and collecting the sieved straw powder for subsequent use;

[0055] (2) Soak the stalk powder obtained in step (1) in 10wt% ammonia water for 40 hours, suction filter, wash the solid with water, and dry at 65°C. The stalk powder obtained in the step (1) and ammonia water The mass ratio is 1:10;

[0056] (3) Take the straw powder obtained after drying in step (2), treat it in 2mol / L nitric acid solution at 95°C for 40min, filter with suction, wash the solid with water, dry at 65°C, grind, and pass through 100 mesh sieve, spare;

[0057] (4) Put the straw powder prepared in step (3) into a three-necked flask, add an initiator, and initiate for 15 minutes; add urea and acrylic acid with a neutralization degree of 55%; add...

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Abstract

The invention relates to a preparation method of straw-based super absorbent resin with a nitrogen phosphorus fertilizer slow-release function. The straw-based super absorbent resin with the nitrogen phosphorus fertilizer slow-release function is super absorbent resin having a semi-interpenetrating network structure, which is obtained by steps of carrying out graft copolymerization on cross-linked polymers (wheat straw, acrylic acid and polyvinyl alcohol) under the action of an initiator and a cross-linking agent to form a three-dimensional network polymer and interpenetrating with the cross-linked polymer polyvinyl alcohol simultaneously, wherein a part of the added nitrogen fertilizer reacts with acrylic acid, and the other part is subjected to a self-condensation reaction to be embedded in the resin; and the added phosphorus fertilizer is directly embedded in the resin in the own shape. The straw-based super absorbent resin with the nitrogen phosphorus fertilizer slow-release function prepared by the method disclosed by the invention has the advantages of good absorbent performance, salt resistance and the performance of continuously providing fertilizer for crops, high strength, low cost, simple and convenient production process and can be widely applied to agricultural water retention and fertilizer application.

Description

technical field [0001] The invention relates to a method for preparing a semi-interpenetrating network structure straw-based superabsorbent resin with the function of a slow-release fertilizer, belonging to the technical fields of chemistry and environment. Background technique [0002] Drought, water shortage and soil degradation are important factors restricting the sustainable development of agriculture in our country. my country has a vast land, with large areas of desert and arid and semi-arid areas. In recent years, with the global warming, drought has intensified, and the arid area of ​​farmland has continued to expand. Studies have found that the use of super absorbent resins in agriculture can not only reduce irrigation water consumption, reduce crop mortality, accelerate crop growth, increase crop yield, but also improve soil and increase soil erosion resistance. Therefore, superabsorbent resins have broad application prospects in agriculture. [0003] Slow-rele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/06C08F222/38
Inventor 李倩李小娣苏园岳钦艳高宝玉苏屹
Owner SHANDONG UNIV
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