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Starch-based super-absorbent resin environment friendly slow-release fertilizer and preparation method thereof

A super absorbent resin, environmentally friendly technology, applied in nitrogen fertilizers, fertilization devices, fertilizer mixtures, etc., can solve the problems of microbial degradation, resource waste, eutrophication, etc., to improve reaction efficiency, shorten reaction time, and reduce energy consumption. Effect

Inactive Publication Date: 2016-11-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Chemical fertilizers play a very important role in agricultural production. At present, due to factors such as loss, volatilization, infiltration, and soil caking, the utilization rate of chemical fertilizers in China is less than 50%. The low utilization rate of chemical fertilizers not only causes a huge waste of resources, but also Environmental and food safety issues such as eutrophication of surface water, excessive nitrate nitrogen in groundwater and vegetables, and increased emissions of nitrous oxide have also appeared in some areas, which threaten human health.
However, most of the coating materials of the existing coated slow-release chemical fertilizers are derivatives of petrochemical products, which cannot be degraded by microorganisms in the soil, so the coating materials will remain in the soil, causing a series of problems such as environmental pollution

Method used

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  • Starch-based super-absorbent resin environment friendly slow-release fertilizer and preparation method thereof
  • Starch-based super-absorbent resin environment friendly slow-release fertilizer and preparation method thereof
  • Starch-based super-absorbent resin environment friendly slow-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Combine corn starch (moisture content 13.29%), boiling water, acrylamide, N, N-methylenebisacrylamide (mass ratio of corn starch: acrylamide: boiling water is 4:6:15 on a dry basis, N , the mass of N-methylenebisacrylamide is 0.47% of the sum of the mass of cornstarch and acrylamide on a dry basis) into a double-roller internal mixer at 80 °C, after mixing and banburying for 10 minutes (rotational speed 80 rpm) , lower the temperature to 60°C, then add ceric ammonium nitrate (the mass of ceric ammonium nitrate is 2.5% of the sum of the dry basis corn starch and acrylamide mass), then mix and banbury for 10 min (speed 80 rpm), and finally add hydrogen Sodium oxide (sodium hydroxide: acrylamide molar ratio is 1:1), after mixing and banburying for 10 min (speed 80 rpm), the crude product was obtained. After the crude product was soaked in tap water for 24 h, it was washed with tap water until pH = 7; then the product was placed in an air-dried oven at 80 °C to constant...

Embodiment 2

[0037] (1) Tapioca starch (moisture content 15.37%), boiling water, acrylamide, N, N-methylenebisacrylamide (the mass ratio of tapioca starch: acrylamide: boiling water on a dry basis is 4:6:15, N , the mass of N-methylenebisacrylamide is 0.47% of the sum of the mass of starch and acrylamide) into the double-roller internal mixer at 80 °C, after mixing and banburying for 10 minutes (speed 80rpm), cool down to 60 °C, then add ceric ammonium nitrate (the mass of ceric ammonium nitrate is 2.5% of the sum of the mass of dry base tapioca starch and acrylamide), mix and banbury for 10 min (speed 80 rpm), and finally add sodium hydroxide (hydrogen Sodium oxide: acrylamide molar ratio is 1:1), after mixing and banburying for 10 min (rotating speed 80 rpm), the crude product was obtained. After the crude product was soaked in tap water for 24 h, it was washed with tap water to pH = 7; then the product was placed in an air-dried oven at 80 °C to constant weight; it was ground again and ...

Embodiment 3

[0041] (1) Potato starch (moisture content 15.84%), boiling water, acrylamide, N, N-methylenebisacrylamide (mass ratio of potato starch: acrylamide: boiling water on a dry basis is 4:6:15, N , the mass of N-methylenebisacrylamide is 0.47% of the sum of the mass of starch and acrylamide) into the double-roller internal mixer at 80 °C, after mixing and banburying for 10 minutes (speed 80rpm), cool down to 60 °C, then add ceric ammonium nitrate (the mass of ceric ammonium nitrate is 2.5% of the sum of the mass of starch and acrylamide), mix and banbury for 10 min (speed 80 rpm), and finally add sodium hydroxide (sodium hydroxide: The molar ratio of acrylamide is 1:1), and the crude product was obtained after mixing and banburying for 10 min (rotating speed 80 rpm). After the crude product was soaked in tap water for 24 h, it was washed with tap water to pH = 7; then the product was placed in an air-dried oven at 80 °C to constant weight; it was ground again and passed through a 2...

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Abstract

The invention discloses a starch-based super-absorbent resin environment friendly slow-release fertilizer and a preparation method thereof. The preparation method comprises the following steps: (1) adding starch, boiling water, acrylamide and N,N-methylene-bisacrylamide into a two-roll internal mixer, mixing, banburying, cooling, adding ceric ammonium nitrate, mixing, banburying, adding sodium hydroxide, mixing, banburying to obtain a crude product, soaking to absorb water, washing, drying, grinding, and screening to obtain starch-based super-absorbent resin powder; (2) uniformly spraying an ethanol mixed solution of ethyecellulose and stearic acid onto the surface of urea granules, and drying; and (3) wetting the granules obtained in the step (2) by using a mixed liquor of ethyecellulose and stearic acid, coating the granules with the powder obtained in the step (1), and drying to form a starch-based super-absorbent resin film. In soil with water content being 30%, the potato starch-based super-absorbent resin environment friendly slow-release fertilizer releases 60% of urea within 96 h.

Description

technical field [0001] The invention relates to the field of slow-release chemical fertilizers and the field of chemical fertilizer industry, in particular to a starch-based superabsorbent resin environment-friendly slow-release chemical fertilizer and a preparation method thereof. Background technique [0002] Chemical fertilizers play a very important role in agricultural production. At present, due to factors such as loss, volatilization, infiltration, and soil caking, the utilization rate of chemical fertilizers in China is less than 50%. The low utilization rate of chemical fertilizers not only causes a huge waste of resources, but also It also caused environmental and food safety issues such as eutrophication of surface water, excessive nitrate nitrogen in groundwater and vegetables, and increased nitrous oxide emissions in some areas that threatened human health. Therefore, improving the utilization rate of fertilizers by preparing slow-release fertilizers has become ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05C9/00C05G3/90
CPCC05C9/00C05G3/90C05G5/30
Inventor 刘宏生乔冬玲鲍先扬肖小明
Owner SOUTH CHINA UNIV OF TECH
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