Preparation method of cellulose-based multi-nutrient polymer slow-release fertilizer

A cellulose-based, slow- and controlled-release fertilizer technology, applied in urea compound fertilizers, nitrogen fertilizers, phosphate fertilizers, etc., can solve the problems of limited water absorption and water retention capacity, and achieve the effects of saving manpower and material resources, wide sources, and improving performance

Active Publication Date: 2017-12-01
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cellulose is a polyol compound that is highly hydrophilic but has limited water absorption and retention capacity when used alone

Method used

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  • Preparation method of cellulose-based multi-nutrient polymer slow-release fertilizer
  • Preparation method of cellulose-based multi-nutrient polymer slow-release fertilizer
  • Preparation method of cellulose-based multi-nutrient polymer slow-release fertilizer

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preparation example Construction

[0036] A method for preparing a cellulose-based water-absorbing and water-retaining biodegradable multi-nutrient element macromolecule slow-release fertilizer, comprising the following steps:

[0037] (1) Add formaldehyde and urea respectively to the first reactor, use 5% KOH solution to adjust the system pH=8, and react at 40° C. for 2 hours to obtain a methylolurea solution;

[0038] (2) Add acrylic acid, acrylamide and inorganic cellulose powder into the second reactor, and add a KOH solution with a mass fraction of 20% to adjust the neutralization degree of the acrylic acid monomer to 20% to 100%; Potassium hydrogen, initiator and the hydroxymethyl urea solution prepared in step (1), mixed under ice bath for 30min, heated up to 55°C and reacted under nitrogen atmosphere for 4h to obtain a viscous product;

[0039] (3) Granulate the obtained viscous product and then dry it to obtain a cellulose-based water-absorbing and water-retaining biodegradable multi-nutrient polymer s...

Embodiment 1

[0047] A method for preparing cellulose-based water-absorbing and water-retaining biodegradable multi-nutrient element macromolecule slow-release fertilizer, comprising the following steps:

[0048] (1) Add 4.06 g of formaldehyde and 6 g of urea to the first reaction vessel, adjust the pH of the system to 8 with 5% KOH solution, and react at 40° C. for 2 h to obtain a methylol urea solution.

[0049] (2) Add 5g acrylic acid, 2g acrylamide and 0.7g carboxymethyl cellulose powder to the second reaction vessel, and add the KOH solution that the mass fraction is 20% to adjust the neutralization degree of acrylic acid to be 80%; add 0.5g afterwards Potassium dihydrogen phosphate, 0.021 g of ammonium persulfate and 12 g of the hydroxymethyl urea solution prepared in step (1) were mixed for 30 min in an ice bath, heated to 55° C. and reacted for 4 h under a nitrogen atmosphere to obtain a viscous product.

[0050] (3) Granulate the obtained viscous product and then dry it to obtain a...

Embodiment 2

[0053] A method for preparing cellulose-based water-absorbing and water-retaining biodegradable multi-nutrient element macromolecule slow-release fertilizer, comprising the following steps:

[0054] (1) Add 4.06 g of formaldehyde and 6 g of urea to the first reaction vessel, adjust the pH of the system to 8 with 5% KOH solution, and react at 40° C. for 2 h to obtain a methylol urea solution.

[0055] (2) Add 5g of acrylic acid, 2g of acrylamide and 0.7g of hydroxyethyl cellulose powder into the second reaction vessel, and add a KOH solution with a mass fraction of 20% to adjust the degree of neutralization of acrylic acid to 80%; then add 0.5g Potassium dihydrogen phosphate, 0.021 g of ammonium persulfate and 12 g of the hydroxymethyl urea solution prepared in step (1) were mixed for 30 min in an ice bath, heated to 55° C. and reacted for 4 h under a nitrogen atmosphere to obtain a viscous product.

[0056] (3) Granulate the obtained viscous product and then dry it to obtain a...

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Abstract

The invention relates to the field of water-absorbent and water-retention type slow-release fertilizer and discloses a preparation method of cellulose-based water-absorbent and water-retention type biodegradable multi-nutrient polymer slow-release fertilizer. The method comprises specific steps as follows: formaldehyde and urea react at certain temperature, and a hydroxymethylurea solution is obtained; acrylic acid, acrylamide monomers and cellulose in calculated amount are added to the other reactor, and a certain quantity of KOH solutions are added to adjust the neutralization degree of acrylic acid; initiators, monopotassium phosphate and the prepared hydroxymethylurea solution in calculated amount are sequentially added; the mixture is mixed uniformly and reacts at the certain temperature, and a viscous product is obtained; finally, the viscous product is granulated and dried, and the cellulose-based water-absorbent and water-retention type biodegradable multi-nutrient polymer slow-release fertilizer is obtained. The prepared cellulose-based water-absorbent and water-retention type biodegradable multi-nutrient polymer slow-release fertilizer has high water-absorbent and water-retention capability, and nitrogen, phosphorus and potassium elements have excellent slow release performance.

Description

technical field [0001] The invention relates to the field of water-absorbing and water-retaining slow-controlled release chemical fertilizers, in particular to a preparation method of a cellulose-based water-absorbing and water-retaining type biodegradable multi-nutrient polymer slow-controlled release fertilizer. Background technique [0002] The current water-retaining and controlled-release fertilizers are basically coated fertilizers. Most of the structures are core-shell structures with composite fertilizers as the core and water-absorbing resin as the shell. There are disadvantages such as complicated coating process and high cost of membrane materials, which limit the promotion of fertilizers. and apply. Especially with the increasing awareness of environmental protection, people gradually realize that these coating materials are difficult to degrade and will cause environmental pollution if they remain in the soil. [0003] Cellulose, the most abundant polysaccharid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C08F251/02C08F220/06C08F220/56C08F222/38
CPCC05B7/00C05G3/00C08F251/02C05C9/02C08F220/06C08F220/56C08F222/385
Inventor 赵贵哲师巾国向阳宋江刘亚青赵海东茹旭东
Owner ZHONGBEI UNIV
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