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Preparation of fertilizer coating sustained-release agent

A fertilizer coating and slow-release agent technology, which is applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of low cost, and achieve the effects of low cost, simple preparation process, and good ecological environment safety performance

Active Publication Date: 2009-07-22
WUZHOUFENG AGRI SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved is: adding film-forming aids in the preparation process, so that the film-forming effect of the prepared film-coated sustained-release agent is better, and the sustained-release performance is good; moreover, the preparation method is safe and environmentally friendly, and the finished product is easy to degrade and will not damage Environmental pollution and low cost

Method used

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  • Preparation of fertilizer coating sustained-release agent
  • Preparation of fertilizer coating sustained-release agent
  • Preparation of fertilizer coating sustained-release agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation process is as follows:

[0020] 1) Add 1 ton of industrial purified water to the reactor, heat it to 94°C, add polyvinyl alcohol with a water quality of 9%, stir for 1.5 hours until the polyvinyl alcohol is dissolved to obtain a polyvinyl alcohol solution; then cool down to 80°C ;Dilute concentrated hydrochloric acid with a mass concentration of 30% into a dilute hydrochloric acid solution with water according to a volume ratio of 1:1, and add a dilute hydrochloric acid solution with a mass of 1% polyvinyl alcohol solution to the reaction kettle to adjust the pH value to 3;

[0021] 2), add 4% of the water quality used in step 1) to the reaction kettle, and the formaldehyde solution with a content of 37%, keep the temperature at 80°C, stir and react for 30 minutes; add 1% of the polyvinyl alcohol solution to a mass concentration of 25% ammonia solution to adjust the pH value to 7, add 2% urea of ​​the water mass used in step 1) to react for 20 minutes, s...

Embodiment 2

[0025] 1) Add 1 ton of industrial purified water to the reactor, heat it to 98°C, add polyvinyl alcohol with a water quality of 11%, stir for 2 hours until the polyvinyl alcohol dissolves to obtain a polyvinyl alcohol solution; then cool down to 85°C; Dilute concentrated hydrochloric acid with a mass concentration of 30% into a dilute hydrochloric acid solution with water at a volume ratio of 1:1, and add a dilute hydrochloric acid solution with a mass concentration of 2% polyvinyl alcohol solution into the reaction kettle to adjust the pH value to 2;

[0026] 2), add 7% of the water quality used in step 1) to the reaction kettle, and the formaldehyde solution with a content of 37%, keep the temperature at 85°C, stir and react for 35 minutes; add 2% of the polyvinyl alcohol solution to a mass concentration of 25% ammonia solution to adjust the pH value to 8, add urea with 4% water mass used in step 1) to react for 30 minutes, so that urea reacts with excess formaldehyde;

[00...

Embodiment 3

[0029] 1) Add 1 ton of industrial purified water to the reactor, heat it to 96°C, add polyvinyl alcohol with 10% water quality, stir for 1.8 hours until the polyvinyl alcohol is dissolved to obtain a polyvinyl alcohol solution; then cool down to 83°C ; Dilute concentrated hydrochloric acid with a mass concentration of 30% into a dilute hydrochloric acid solution with water according to a volume ratio of 1:1, and add a dilute hydrochloric acid solution with a mass of 1.5% polyvinyl alcohol solution to the reaction kettle to adjust the pH value to 2.5;

[0030] 2), add 5.5% of the water quality used in step 1) to the reaction kettle, and the formaldehyde solution with a content of 37%, keep the temperature at 85°C, stir and react for 33 minutes; add 1.5% of the polyvinyl alcohol solution with a mass concentration of 25% ammonia solution to adjust the pH value to 7.5, add urea with 3% water mass used in step 1) to react for 25 minutes, so that urea reacts with excess formaldehyde;...

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Abstract

The invention discloses a preparation method of a fertilizer envelope sustained release agent. At first, polyvinyl formal is prepared; and then the polyvinyl formal is mixed and stirred with pure acrylic emulsion, film forming assistant, polyoxyethylene nonyl phenyl ether (10) and bentonite to prepare the finished product. The use of the filming forming assistant ensures the sustained release agent is continuously formed into films and the film forming effect is good, moreover, the envelope sustained release agent is a polymeric material, and has the advantages of good sustained release performance, easy degradation, and no pollution to soil.

Description

technical field [0001] The invention relates to a preparation method of a slow-release agent, in particular to a preparation method of a fertilizer-coated slow-release agent. Background technique [0002] At present, slow-release and controlled-release fertilizers are favored in modern agricultural production because of their high fertilizer utilization rate, one-time fertilization of crops in one season, saving labor and time, high economic benefits, and effective reduction of environmental pollution caused by fertilization. [0003] Existing sustained-release coating materials include sulfur coating, sulfur plus resin coating, thermosetting or thermoplastic resin coating, coating coating, etc. The coating of sulfur coating is easy to be damaged and cannot play a good role in sustained release. Therefore, the use of sulfur plus resin coating or thermosetting or thermoplastic resin coating can effectively solve the damage problem of simple sulfur coating, but the cost is hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/08C05G3/80C05G3/90
Inventor 王学江
Owner WUZHOUFENG AGRI SCI & TECH
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