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Low-temperature rapid polymerization starch-based superabsorbent polymer and its preparation method

A water-absorbing polymer and polymerization-type technology, applied in fertilizer mixtures, agriculture, fertilization equipment, etc., can solve the problems of high polymerization reaction temperature, complicated preparation of raw materials, long reaction time, etc., achieve high gelatinization temperature, wide range of sources, low Effect of Iodine Affinity

Active Publication Date: 2021-03-12
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it takes too long to prepare the reaction
[0008] In summary, the preparation of existing water-absorbent resins generally has problems such as high polymerization reaction temperature, complicated preparation raw materials, long reaction time, and high reaction energy consumption.

Method used

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  • Low-temperature rapid polymerization starch-based superabsorbent polymer and its preparation method
  • Low-temperature rapid polymerization starch-based superabsorbent polymer and its preparation method
  • Low-temperature rapid polymerization starch-based superabsorbent polymer and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0057] (1) Get analytically pure soluble cornstarch in a three-neck flask, add water to make a starch homogenate with a weight percentage of 40%, add 1.25% of cornstarch weight sulfamic acid as an acid modifier, heat in a water bath at 50°C, and mechanically After stirring for 1 hour, the denatured starch homogenate was poured out, and dried at 50° C. to obtain acid-modified corn starch.

[0058] (2) After dissolving the acid-modified starch prepared in step (1) with 2 times the weight of water, add ammonium persulfate initiator, dissolve together and stir for 30 minutes to generate persulfate radicals, and pass into the reaction system Nitrogen is used to remove oxygen in the reaction system.

[0059] (3) Using acrylic acid as a reactive monomer, use a NaOH solution with a concentration of 3mol / L to neutralize the acrylic acid to a neutralization degree of 65% in an ice bath, and then add the crosslinking agent N, N-methylenebisacrylamide , dissolved into a homogeneous solut...

Embodiment 2

[0065] Take 300g of unrefined cornstarch, add 800g of deionized water and stir at a constant speed at 50°C for 2h, add 100ml of 3% sulfurous acid solution, continue to stir for 1h, take it out and dry it to prepare acid-modified cornstarch.

[0066] Weigh 100g of acid-modified cornstarch, 200g of water, and 500g of acrylamide, put them into the reactor, add 100ml of 5% ammonium persulfate aqueous solution, pass through nitrogen, stir at 60°C for 1h, then add N,N-methylene After 5.0 g of bisacrylamide was stirred and reacted for 30 minutes, a viscoelastic crude product was obtained. The crude product was taken out, washed with excess deionized water, dried and ground to obtain a superabsorbent polymer. The product absorbs 863.3 times in deionized water and 97.6 times in normal saline.

Embodiment 3

[0068] Weigh 800g of industrial starch, add 5000ml of tap water, heat in a water bath at 45°C in the reactor and stir at a constant speed for 1h, add 500ml of 1.5% aqueous sulfamic acid solution, continue stirring for 1h, add 750ml of 5% ammonium persulfate aqueous solution, and then pass Nitrogen: Weigh 5000g of industrial-grade acrylic acid, add 8L of 5mol / L industrial sodium hydroxide solution, and carry out neutralization treatment. After the acrylic acid solution is cooled, add it to the reaction kettle, and add 5% N,N-methylenebisacrylamide solution dropwise After 125ml, continue to stir, and after about 20-30 minutes, a viscoelastic crude product can be formed. After taking it out, wash it, dry it and grind it to obtain a superabsorbent polymer. The water absorption of this product is 986.78 times in deionized water and 124.5 times in normal saline.

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Abstract

The invention discloses a low-temperature fast-polymerizing starch-based superabsorbent polymer. The starch-based superabsorbent polymer is prepared by the following steps: (1) dissolving starch in water to make a homogenate, and the content of the starch in the homogenate is The content is 30-50%; add an acid modifier to the homogenate, react at 40-50°C for 0.5-1.5h, and dry to obtain acid-modified starch; (2) After dissolving the acid-modified starch in water, add persulfuric acid Salt initiator, stirred and reacted for 30-60min under the protection of inert gas; then added acrylic substance and cross-linking agent, stirred and reacted for 20-30min at 40-60°C; washed and dried the reaction product to obtain the product. The starch-based superabsorbent polymer of the present invention is prepared by rapid polymerization under low temperature conditions. It has strong water absorption capacity and good salt tolerance, and can be mixed with ordinary fertilizers without increasing operating costs. To achieve the effect of increasing production and increasing efficiency.

Description

technical field [0001] The invention relates to the technical field of functional polymer materials, in particular to a low-temperature fast-polymerizing starch-based superabsorbent polymer and a preparation method thereof. Background technique [0002] With the development and progress of social productivity, agriculture is also developing rapidly. Agricultural water use has always been an urgent problem to be solved. Natural precipitation is one of the extremely important resources that cannot be ignored in agricultural production. In order to make full use of natural precipitation, people began A series of invention research. [0003] Superabsorbent polymers were first studied by the United States in the 1960s, and were widely used in agriculture and forestry in the late 1970s. They are water-absorbent polymers that can absorb hundreds or thousands of times their own weight. The initial synthetic raw material is propylene Nitrile, acrylamide, etc., later developed acryli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F222/38C08B30/12C05G3/00C05G3/90C05G3/80
CPCC08F251/00C08F222/385C08B30/12C05G3/00C05G3/90C05G3/80C08F220/06C08F220/56
Inventor 张民赵晨浩刘之广张强卢豪郭延乐贾聪朱文帅
Owner SHANDONG AGRICULTURAL UNIVERSITY
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