A kind of preparation method of in-situ reaction film-forming pore-type controlled-release fertilizer

An in-situ reaction and controlled-release fertilizer technology, which is applied in the direction of fertilizer mixture, layered/coated fertilizer, application, etc., can solve the problems that the nutrient release effect cannot be fully realized according to demand, the release amount is fixed, and the nutrient release channel is single. , to achieve the effect of benefiting crop growth and shortening the fertilizer effect period

Active Publication Date: 2017-04-12
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is that the nutrient release channel of in-situ reaction film-forming controlled-release fertilizer is too single, the release amount is relatively fixed, and the effect of nutrient release cannot be fully realized according to demand. On the basis of in-situ reaction film-forming technology , by adding different types and different amounts of porogenic materials to the membrane material, in order to combine with the coating process to establish a complete pore-induced controlled release technology of coated fertilizers, and change the pore size, porosity, moisture permeability, water absorption, etc. on the membrane Regulate the permeability of the coating layer to achieve the purpose of regulating nutrient release, and adjust the nutrient release mode of the coated controlled-release fertilizer

Method used

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  • A kind of preparation method of in-situ reaction film-forming pore-type controlled-release fertilizer
  • A kind of preparation method of in-situ reaction film-forming pore-type controlled-release fertilizer
  • A kind of preparation method of in-situ reaction film-forming pore-type controlled-release fertilizer

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Experimental program
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Effect test

Embodiment 1

[0041] Add 4% sodium bentonite of the total weight of the coating skeleton substance, and the thickness of the coating is 6%. The coating skeleton substance is a vegetable oil polyol and a curing agent, and the weight ratio of the two is 1:1; the curing agent is poly isocyanate.

[0042] Weigh each component by weight as follows:

[0043] Vegetable oil polyol (castor oil and epoxidized soybean oil blend): 300 g

[0044] Curing agent (polymethylene polyphenyl diisocyanate): 300 g

[0045] Porogenic material (sodium bentonite): 24 g

[0046] Urea (3 mm≤d≤5 mm): 10 Kg

[0047] The schematic diagram of the preparation process of the coated controlled-release fertilizer of the present invention refers to the attached figure 1 , including the following steps:

[0048] S1: Vegetable oil polyol and polyisocyanate were weighed according to the weight ratio of vegetable oil polyol to polyisocyanate 1:1, and porogenic materials were added to vegetable oil polyol.

[0049] S2: First...

Embodiment 2

[0052] Add the sodium bentonite of 8% of the total weight of the coating skeleton substance, and the thickness of the coating is 6%. The coating skeleton substance is vegetable oil polyol and curing agent, and the weight ratio of the two is 1:1; isocyanate.

[0053] Weigh each component by weight as follows:

[0054] Vegetable oil polyol (castor oil and epoxidized soybean oil blend): 300 g

[0055] Curing agent (polymethylene polyphenyl diisocyanate): 300 g

[0056] Porogenic material (sodium bentonite): 48 g

[0057] Urea (3 mm≤d≤5 mm): 10 Kg

[0058] The schematic diagram of the preparation process of the coated controlled-release fertilizer in this embodiment refers to the attached figure 1 Shown, step is with embodiment 1, and envelope thickness is 6%.

Embodiment 3

[0060] Add magnesium carbonate of 4% of the total weight of the coating skeleton substance, and the thickness of the coating is 6%. The coating skeleton substance is vegetable oil polyol and curing agent, and the weight ratio of the two is 1:1; the curing agent is polyisocyanate .

[0061] Weigh each component by weight as follows:

[0062] Vegetable oil polyol (castor oil and epoxidized soybean oil blend): 300 g

[0063] Curing agent (polymethylene polyphenyl diisocyanate): 300 g

[0064] Porogenic material (magnesium carbonate): 24 g

[0065] Urea (3 mm≤d≤5 mm): 10 Kg

[0066] The schematic diagram of the preparation process of the coated controlled-release fertilizer in this embodiment refers to the attached figure 1 Shown, step is with embodiment 1, and envelope thickness is 6%.

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Abstract

The invention discloses a hole-forming controlled-release method of enveloped controlled-release fertilizers and a preparation method of the in-situ reaction film-forming and hole-forming type controlled-release fertilizers. The preparation method comprises the following steps: adding different types of hole-forming materials into vegetable-oil polyol, preparing to obtain a coating material of the vegetable-oil polyol containing a hole forming agent, by adopting two types of materials such as the vegetable-oil polyol containing the hole forming agent and polyisocyanate as skeleton materials, spraying the two types of materials onto the surfaces of the fertilizers in a fluidized bed by an in-situ reaction film-forming technology, carrying out in-site reaction, thus forming a coating film and preparing the in-situ reaction film-forming and hole-forming type controlled-release fertilizers. The preparation method disclosed by the invention has the advantages that the permeability of the coating layer of the fertilizers can be controlled, the hole-diameter size, the porosity, the moisture permeability and the water absorption rate and the like on the thin-film layer can be changed and the purpose of controlling the nutrient release can be realized; the hole forming agent has no influence on the coating integrity of the controlled-release fertilizers, the nutrient release mode of the coated controlled-release fertilizers can be changed, and the fertilizer effect period of the coated fertilizers can be shortened, so that the nutrient release of the controlled-release fertilizers and the nutrient need for crops can be well combined.

Description

technical field [0001] The invention belongs to the technical field of controlled-release fertilizers. More specifically, it relates to a pore-forming and controlled-release technology for coated controlled-release fertilizers and a method for preparing film-forming pore-controlled controlled-release fertilizers by in-situ reaction. Background technique [0002] In agricultural production, the application of chemical fertilizers is one of the important measures to increase grain production. In order to continuously increase grain production, the use of chemical fertilizers is also increasing. However, due to improper fertilization and low fertilizer utilization rates, a large amount of nitrogen is lost. A great economic loss has been caused, and serious environmental pollution problems have been caused due to the loss of nitrogen fertilizer. An effective way to solve fertilizer loss and environmental pollution is to increase fertilizer utilization efficiency and reduce fert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
CPCC05G5/30
Inventor 樊小林张立丹刘芳李玲刘海林解永军奕林邵明升
Owner SOUTH CHINA AGRI UNIV
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