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Degradable resin coated slow release fertilizer and preparation method thereof

A coating slow-release and degradable resin technology, applied in layered/coated fertilizers, fertilization devices, fertilizer mixtures, etc., can solve problems such as high production costs, difficult degradation of coating materials, environmental hazards, etc., and improve fertilizer utilization rate effect

Pending Publication Date: 2022-06-07
TIANJIN AGRICULTURE COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its high production cost, it has become the main reason to limit its large-scale promotion, and some coating materials are difficult to degrade, and long-term use will cause environmental hazards

Method used

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  • Degradable resin coated slow release fertilizer and preparation method thereof
  • Degradable resin coated slow release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A degradable resin-coated slow-release fertilizer, comprising the following components by weight:

[0027] 60 parts of modified starch, 1 part of gelatinizer, 1 part of oxidizing agent, 4 parts of filler, 10 parts of plasticizer, 0.1 part of stabilizer, 1 part of lubricant, 1 part of crosslinking agent, 1 part of additive, Na 2 S 2 O 3 1 serving.

[0028] A preparation method of a degradable resin-coated slow-release fertilizer, comprising the following steps:

[0029] a) Preparation of modified starch: Add 60 parts of commercially available starch and 60 parts of deionized water to a high-speed mixer to mix, heat to 50°C, stir for 5 minutes, add 1 part of NaOH, H 2 O 2 1 part, Na was added after 50min of reaction 2 S 2 O 3 1 part, stir at high speed for 3 minutes to stop oxidation, then add deionized water to wash, dehydrate and dry to obtain finished modified starch;

[0030] b) Preparation of coating material: 60 parts of modified starch, 300 parts of deioni...

Embodiment 2

[0033] A degradable resin-coated slow-release fertilizer, comprising the following components by weight:

[0034] 70 parts of modified starch, 1.5 parts of gelatinizer, 1.5 parts of oxidant, 5 parts of filler, 12 parts of plasticizer, 0.15 parts of stabilizer, 1.5 parts of lubricant, 1.5 parts of crosslinking agent, 1.5 parts of additives, Na 2 S 2 O 3 1.5 servings.

[0035] A preparation method of a degradable resin-coated slow-release fertilizer, comprising the following steps:

[0036] a) Preparation of modified starch: add 70 parts of commercially available starch and 70 parts of deionized water to a high-speed mixer and mix, heat to 60°C, stir for 8 minutes, add 1.5 parts of NaOH, H 2 O 2 1.5 parts, Na was added after 55min of reaction 2 S 2 O 3 1.5 parts, stirred at high speed for 6 minutes, terminated oxidation, then added deionized water to wash, dehydrated and dried to obtain the finished product of modified starch;

[0037] b) Preparation of coating material:...

Embodiment 3

[0040] A degradable resin-coated slow-release fertilizer, comprising the following components by weight:

[0041] 80 parts of modified starch, 2 parts of gelatinizer, 2 parts of oxidizing agent, 6 parts of filler, 15 parts of plasticizer, 0.2 part of stabilizer, 2 parts of lubricant, 2 parts of crosslinking agent, 2 parts of additives, Na 2 S 2 O 3 2 servings.

[0042] A preparation method of a degradable resin-coated slow-release fertilizer, comprising the following steps:

[0043] a) Preparation of modified starch: Add 80 parts of commercially available starch and 80 parts of deionized water to a high-speed mixer to mix, heat to 70°C, stir for 10 minutes, add 2 parts of NaOH, H 2 O 2 2 parts, Na was added after 60min of reaction 2 S 2 O 3 2 parts, high-speed stirring for 10min, termination of oxidation, then adding deionized water for washing, dehydration and drying to obtain the finished modified starch;

[0044] b) Preparation of coating material: 80 parts of modif...

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Abstract

The invention discloses a degradable resin coated slow release fertilizer and a preparation method thereof. The preparation method is characterized by comprising the following steps: selecting materials such as diatomite, wood flour, phthalic ester, epoxy resin, grease amide, a cross-linking agent, calcium carbonate, magnesium carbonate, sodium bicarbonate and modified starch, and performing hot melting, uniform mixing and processing to obtain a coating material; materials such as urea particles, a compound fertilizer and a granular potash fertilizer are used as core materials to prepare the degradable resin coated slow-release fertilizer. The production process is simple in method and low in production cost. The degradable resin is selected to coat fertilizer particles, so that fertilizer nutrients can be slowly released, and the utilization rate of the fertilizer is improved; after the nutrients are completely released, the residual coating material in the soil can be completely degraded to become nutrients which can be absorbed by plants, so that the environment is not polluted, and the fertilizer is an environment-friendly fertilizer.

Description

technical field [0001] The invention relates to a preparation process of a slow-release fertilizer, in particular to a preparation process of a degradable resin-coated slow-release fertilizer. Background technique [0002] Fertilizers play an important role in agricultural production. However, with the continuous use of fertilizers, crop yields will not continue to increase with the increase in the amount of fertilizer applied. This is due to the fact that after the fertilizer is applied to the soil, it is easy to dissolve, the nutrients are quickly released, and the crops are less absorbed and utilized, resulting in the volatilization and serious leaching of fertilizer nutrients. Due to the loss of fertilizers, the pressure on the environment has increased, resulting in a series of environmental problems such as groundwater pollution and water eutrophication. Therefore, improving the utilization rate of fertilizers, reducing its pollution to the ecological environment, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/30C05G3/40
CPCC05G5/37C05G5/38C05G3/40Y02P60/21
Inventor 郑润东张文静唐琴李畅
Owner TIANJIN AGRICULTURE COLLEGE
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