Slow controlled release fertilizer coating agent

A slow and controlled release fertilizer and coating agent technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of air permeability, water permeability decrease, residual components polluting the soil environment, long degradation cycle, etc., to improve crop yield and quality, improve the stress resistance function, and improve the effect of fertilizer efficiency utilization

Inactive Publication Date: 2014-11-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is that some coating materials cannot be degraded under natural conditions or the degradation cycle is too long, and the residual components pollute the soil environment, which may cause irreversible long-term hidden dangers such as soil compaction, air permeability, and water permeability.
For example, polyvinyl chloride plastic coating materials are difficult to degrade under natural conditions. After a large amount of accumulation, they will seriously affect the basic structure of the soil, causing soil pollution, and burying hidden dangers for crop growth and production.
Therefore, the existing slow and controlled release fertilizer coating materials are not perfect and need to be improved urgently

Method used

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  • Slow controlled release fertilizer coating agent

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The slow and controlled release fertilizer coating agent described in this embodiment is made from the following raw materials, each raw material and weight percentage are: 75% of montan wax resin, 4% of sodium fulvic acid, 6% of potassium fulvic acid, 10% of methyl acetate , lignite essence 5%, the mass percentage sum of all raw materials is 100%.

[0029] The preparation method of the slow and controlled release fertilizer coating agent described in the present embodiment comprises the following steps:

[0030] (1) Put 750kg of montan wax resin and 100kg of methyl acetate into the reactor I according to the weight ratio, heat up to 40°C, and stir under normal pressure for 10 minutes to obtain the preparatory solution I;

[0031] (2) Put 40kg of sodium fulvic acid, 60kg of potassium fulvic acid and 50kg of lignite essence into the reaction kettle II according to the weight ratio, heat up to 50°C, and stir for 10 minutes under normal pressure to obtain the...

Embodiment 2

[0035] Example 2: The slow and controlled release fertilizer coating agent described in this embodiment is made from the following raw materials, and the raw materials and weight percentages are: 40% of montan wax resin, 20% of sodium brown humate, 20% of potassium brown humate, ethyl acetate 5%, lignite essence 15%, the weight percentage sum of all raw materials is 100%.

[0036] The preparation method of the slow and controlled release fertilizer coating agent described in the present embodiment comprises the following steps:

[0037] (1) Put 400kg of montan wax resin and 50kg of ethyl acetate into the reaction kettle I according to the weight ratio, heat up to 60°C, stir for 5 minutes under normal pressure, and obtain the preparatory solution I;

[0038](2) Put 200kg of sodium brown humate, 200kg of potassium brown humate and 150kg of lignite essence into the reaction kettle II according to the weight ratio, heat up to 60°C, and stir for 5 minutes under normal pres...

Embodiment 3

[0042] Example 3: The slow and controlled release fertilizer coating agent described in this embodiment is made from the following raw materials, and the raw materials and weight percentages are: 42% of montan wax resin, 15% of sodium brown humic acid, 5% of ammonium brown humic acid, and 5% of brown humic acid Potassium 10%, propyl acetate 8%, lignite essence 20%, the weight percentage sum of all raw materials is 100%.

[0043] The preparation method of the slow and controlled release fertilizer coating agent described in the present embodiment comprises the following steps:

[0044] (1) Put 420kg of montan wax resin and 80kg of propyl acetate into the reaction kettle I according to the weight ratio, heat up to 50°C, stir under normal pressure for 8 minutes, and obtain the preparatory solution I;

[0045] (2) Put 150kg of sodium brown humate, 50kg of ammonium brown humate, 100kg of potassium brown humate and 200kg of lignite essence into the reactor II according t...

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Abstract

The invention discloses a slow controlled release fertilizer coating agent which is scientifically prepared from lignite wax resin, humate, a resin solvent and lignite essence. The coating materials with different controlled release rates are prepared by regulating the ratio of the lignite wax resin to the humate via utilization of the hydrophily of the humate and the hydrophobicity of the lignite wax resin and the different biological functions of the humate and the lignite wax resin, so that the purpose of mutual long-acting and quick-acting coordination is realized. The coating agent disclosed by the invention conforms to the concepts of 'fertilizer coated by fertilizer' and 'soil nourished by soil'. The selected materials for preparing the coating agent can be completely and naturally degraded, and degradation products can be used for improving soil environment and stress resistance of crops. In addition, the coating agent is simple in preparation process, easily available in raw materials, low in production cost and easy to popularize.

Description

technical field [0001] The invention relates to a coating agent for slow and controlled release fertilizers, belonging to the technical field of slow and controlled release fertilizers. Background technique [0002] At present, slow and controlled release fertilizers have gradually become the development trend of chemical fertilizers due to their advantages of low fertilization frequency and high fertilizer utilization rate. Although slow and controlled release fertilizers have been commercialized, due to relatively high costs, the price is not yet generally accepted, especially the use of high-priced coating materials such as epoxy resin and polyurethane, so the current proportion of total fertilizer consumption is relatively low. In order to broaden the application of slow and controlled release fertilizers, while continuously improving the controllability of slow and controlled release fertilizers and reducing environmental pollution problems, it is also necessary to con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 李宝才袁承任万云张惠芬戴伟峰
Owner KUNMING UNIV OF SCI & TECH
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