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Crop straw-based water retention type multi-nutrient element biodegradable high-molecular sustained and controlled release fertilizer

A technology of crop straw and slow-release fertilizer, which is applied in the direction of matrix fertilizer, urea compound fertilizer, nitrogen fertilizer, etc., can solve the problems of waste of environmental resources, air pollution, etc., achieve low cost, simple and effective preparation process, and improve crop quality Effect

Active Publication Date: 2017-10-20
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional agricultural treatment of crop straw is mainly incineration and landfill, which not only causes air pollution, but also causes a huge waste of environmental resources

Method used

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  • Crop straw-based water retention type multi-nutrient element biodegradable high-molecular sustained and controlled release fertilizer
  • Crop straw-based water retention type multi-nutrient element biodegradable high-molecular sustained and controlled release fertilizer
  • Crop straw-based water retention type multi-nutrient element biodegradable high-molecular sustained and controlled release fertilizer

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preparation example Construction

[0044] A method for preparing water-absorbing and water-retaining multi-nutrient element biodegradable polymer slow-controlled release fertilizer, comprising the following steps:

[0045] (1) Pretreatment of crop straw: Weigh crop straw powder, immerse in distilled water, filter after soaking at 60°C for 12h, place the filtrate in a mixture of 24% KOH and 1% NaBH 4 Stir in the formed solution for 3 hours and then filter, then repeatedly rinse the filtrate with distilled water until the filtrate is neutral, and dry it for later use;

[0046] (2) 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;

[0047] (3) In the second reactor, add acrylic acid, acrylamide and the pretreated crop stalk powder in step (1), and add a KOH solution with a mass fraction of 20% to adjust the neutralization degree of the acrylic acid monomer to be 20% to 20%. 100%; then add pot...

Embodiment 1

[0057] A method for preparing crop straw-based water-absorbing and water-retaining multi-nutrient element biodegradable polymer slow-controlled release fertilizer, comprising the following steps:

[0058] (1) Pretreatment of crop straw: Weigh crop straw powder, immerse in distilled water, filter after soaking at 60°C for 12h, place the filtrate in a mixture of 24% KOH and 1% NaBH 4 The resulting solution was stirred for 3 hours and then filtered, and then the filtrate was repeatedly washed with distilled water until the filtrate was neutral, and dried for later use.

[0059] (2) Add 6.70 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.

[0060] (3) Add 5g of acrylic acid, 2g of acrylamide and 0.7g of the crop stalk powder treated in step (1) to the second reaction vessel, and add a KOH solution with a mass fraction of 20% to adjust the neutraliz...

Embodiment 2

[0064] A method for preparing crop straw-based water-absorbing and water-retaining multi-nutrient element biodegradable polymer slow-controlled release fertilizer, comprising the following steps:

[0065] (1) Pretreatment of crop straw: Weigh crop straw powder, immerse in distilled water, filter after soaking at 60°C for 12h, place the filtrate in a mixture of 24% KOH and 1% NaBH 4 The resulting solution was stirred for 3 hours and then filtered, and then the filtrate was repeatedly washed with distilled water until the filtrate was neutral, and dried for later use.

[0066] (2) Add 4.06 g of formaldehyde and 6 g of urea to the first reaction container, adjust the pH of the system to 8 with 5% KOH solution, and react at 40° C. for 2 hours to obtain a methylolurea solution.

[0067] (3) In the second reaction vessel, add 5.6g acrylic acid, 1.4g acrylamide and 0.7g step (1) in the processed crop stalk powder, and add the KOH solution that mass fraction is 20% to adjust the neutr...

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Abstract

The invention relates to the field of water absorption and water retention type sustained and controlled release fertilizers, and concretely relates to a crop straw-based water retention type multi-nutrient element biodegradable high-molecular sustained and controlled release fertilizer and a preparation method thereof. The method comprises the following steps: preprocessing crop straws, and reacting formaldehyde with urea at a certain temperature to obtain a hydroxymethyl carbamide solution; adding acrylic acid, an acrylamide monomer and the preprocessed crop straws into another reactor, and adding a KOH solution o adjust the neutralization value of the acrylic acid; sequentially adding an initiator, potassium dihydrogen phosphate and the prepared hydroxymethyl carbamide solution; uniformly mixing above materials , and reacting the obtained mixture to obtain a viscous product; and granulating and drying the viscous product to obtain the crop straw-based water retention type multi-nutrient element biodegradable high-molecular sustained and controlled release fertilizer. The crop straw-based water retention type multi-nutrient element biodegradable high-molecular sustained and controlled release fertilizer prepared in the invention has high water absorption and water retention ability, and nitrogen, phosphorus and potassium elements in the fertilizer have excellent sustained and controlled 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 crop straw-based water-absorbing and water-retaining type multi-nutrient element biodegradable polymer slow-controlled release fertilizer and a preparation method thereof. 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] Straw is a by-product of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/08C08F289/00C08F220/06C08F220/56C05G3/80C05G3/90
CPCC05C9/02C05G3/00C05G3/80C05G3/90C05G5/40C08F289/00C08F220/06C05F11/00
Inventor 刘亚青茹旭东向阳赵海东赵贵哲宋江师巾国
Owner ZHONGBEI UNIV
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