Biodegradable agricultural high-absorbent resin and preparation thereof

A super absorbent resin and biodegradation technology, applied in the field of biodegradable agricultural super absorbent resin and its preparation, can solve the problems of cumbersome post-processing work, increased cost, cumbersome operation steps, etc., and achieve significant social and economic benefits, good biological Degradation performance, the effect of simple and easy process

Inactive Publication Date: 2008-10-08
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Guo Yan et al. directly carried out alkali cooking on wheat straw, and then grafted and copolymerized with acrylic acid and acrylamide to form agricultural water-absorbent resin after nitric acid degradation. Although the cost was reduced, the operation steps were cumbersome and produced a large amount of acid-base wastewater
The above preparation methods mostly use increasing the amount of monomers to increase the water absorption rate, but this will inevitably increase the cost
[0014] In addition, the preparation of most water-absorbent resins requires nitrogen gas, or the use of organic solvents as dispersants, etc., which are dangerous to operate, or pollute the environment, and the post-processing work is cumbersome.
In addition, the synthesis of some water-absorbent resins uses methods such as ultraviolet rays, radiation, and microwaves to initiate polymerization, which also has a certain degree of potential safety hazards.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this example, the biodegradable agricultural superabsorbent resin is prepared from the main raw materials in the following weight ratio:

[0046] Corn stalks: 5g,

[0047] Acrylic acid: 4g,

[0048] 1% sulfuric acid aqueous solution: 50ml,

[0049] Sodium hydroxide: 0.35g,

[0050] Initiator: ammonium persulfate 0.75g,

[0051] Crosslinking agent: 0.0125 g of N,N'-methylenebisacrylamide.

[0052] The above-mentioned biodegradable agricultural superabsorbent resin is prepared by a method comprising the following main steps:

[0053] (1) Ultrasonic treatment: Mix 5 g of corn stalks (crop biomass) with 10 ml of water, stir evenly, adjust the pH value to 3.0, place in an ultrasonic extractor, and perform ultrasonic treatment for 3 hours; then centrifuge and separate;

[0054] (2), activation: take the above-mentioned corn stalks after ultrasonic treatment, in a 250ml three-neck flask with a thermometer, add 50ml of 1% sulfuric acid aqueous solution, activate at 90°C f...

Embodiment 2

[0059] In this example, the biodegradable agricultural superabsorbent resin is prepared from the main raw materials in the following weight ratio:

[0060] Straw: 5g,

[0061] Acrylic acid: 2.5g,

[0062] 1% sulfuric acid aqueous solution: 40ml,

[0063] Sodium hydroxide: 0.8g,

[0064] Initiator: ammonium persulfate 0.025g, sodium bisulfite 0.4g,

[0065] Crosslinking agent: 0.5 g of N,N'-methylenebisacrylamide.

[0066] The above-mentioned biodegradable agricultural superabsorbent resin is prepared by a method comprising the following main steps:

[0067] (1), ultrasonic treatment: mix 5 g of rice straw (crop biomass) with 40 ml of water, stir evenly, adjust the pH value to 1.0, place in an ultrasonic extractor, and perform ultrasonic treatment for 2 hours; then centrifuge and separate;

[0068] (2), activation: get above-mentioned rice straw after ultrasonic treatment, in the 250ml there-necked flask with thermometer, add 40ml 1% sulfuric acid aqueous solution, activat...

Embodiment 3

[0073] In this example, the biodegradable agricultural superabsorbent resin is prepared from the main raw materials in the following weight ratio:

[0074] Chaff: 5g,

[0075] Acrylic acid: 7.5g,

[0076] 1% sulfuric acid aqueous solution: 10ml,

[0077] Sodium hydroxide: 3.5g,

[0078] Initiator: ferrous sulfate 0.5g,

[0079] Crosslinking agent: 0.25 g of N,N'-methylenebisacrylamide.

[0080] The above-mentioned biodegradable agricultural superabsorbent resin is prepared by a method comprising the following main steps:

[0081] (1), ultrasonic treatment: mix 5 g of chaff (crop biomass) with 20 ml of water, stir evenly, adjust the pH value to 2.3, place it in an ultrasonic extractor, and perform ultrasonic treatment for 0.5 hour; then centrifuge and separate;

[0082] (2), activation: get the above-mentioned chaff after ultrasonic treatment, in a 250ml three-neck flask with a thermometer, add 10ml of 1% sulfuric acid aqueous solution, activate at 80°C for 3 hours, then c...

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Abstract

The invention discloses a biodegradable agricultural super absorbent resin, which is prepared with the main raw materials by weight ratio as follows: 100 portions of crop biomass, 50-150 portions of acrylic acid, 200-1,000 portions of 1% sulfuric acid aqueous solution, 7-70 portions of sodium hydroxide, 0.25-10.0 portions of N,N`-methylene-bis-acrylamide as cross-linker, as well as at least an initiator selected among 0.5-15.0 portions of persulphate, 0.5-10.0 portions of ferric salt and 0.5-8.0 portions of sodium salt. The resin has good biodegradable performance, moderate water absorption, and greatly reduced costs. The invention also discloses a preparation method of the biodegradable agricultural super absorbent resin.

Description

technical field [0001] The invention belongs to the technical field of biodegradable superabsorbent resins, in particular to a biodegradable agricultural superabsorbent resin and a preparation method thereof. Background technique [0002] Superabsorbent resin is a kind of lightly cross-linked polymer with many hydrophilic groups on its molecular chain. It can absorb dozens or even thousands of times of its own weight in the form of a gel, and has good water retention, and also has the functions of slow release, adsorption, moisture absorption, and moisture release. It has been widely used in sanitary products, Agriculture and horticulture, desert control and greening and other fields. Since the 1980s, the development of superabsorbents has become a hot spot in the field of scientific research. More than 30 countries including the United States, Japan, and France have carried out in-depth research on this type of functional polymer materials, and have achieved amazing result...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F2/00
Inventor 赵仕林何丽娜廖洋苏瑞马骏
Owner SICHUAN NORMAL UNIVERSITY
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