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Compound fertilizer sustained release agent and preparation method thereof

A slow-release agent and compound fertilizer technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of affecting the slow-release effect of fertilizers, cracks on the particle surface, and high production costs, so as to inhibit the excessive release of nutrients and improve the utilization rate. , to avoid the effect of water eutrophication

Active Publication Date: 2014-02-19
SHENZHEN BATIAN ECOTYPIC ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, sulfur itself is relatively brittle, and tiny cracks are prone to appear on the surface of the granules when the fertilizer is wrapped, which will affect the slow-release effect of the fertilizer. It is often necessary to wrap another layer of resin during production, and the production cost is high.

Method used

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  • Compound fertilizer sustained release agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A compound fertilizer slow-release agent, its mass ratio is 100 parts of phenol, 10 parts of water, 100 parts of formaldehyde, and 15 parts of urea.

Embodiment 2

[0031] A preparation method of compound fertilizer slow-release agent, its steps are as follows:

[0032] a. Soak the iron bucket filled with phenol in hot water at 60-70°C and melt it;

[0033] b. adding mass ratio to the polymerization reactor is 100 parts of molten phenol, 10 parts of water, heating and stirring;

[0034] c. When the temperature of the reaction kettle is raised to 60-65°C, add sodium hydroxide with a mass ratio of 6 parts, and adjust the pH to 8-8.5;

[0035] d. Add formaldehyde with a mass ratio of 100 parts to the reactor, and react at 65-70°C for 70-90 minutes;

[0036] e. Heat up the reaction kettle to 70-80°C and react for 60-120 minutes;

[0037] f. Add urea with a mass ratio of 15 parts into the reactor, and react for 30 to 60 minutes.

Embodiment 3

[0039] refer to figure 1 As shown, in the first 30 days of early corn planting, in order to meet the nitrogen demand of corn, the slow-release fertilizer releases nitrogen at a faster rate, so that the release of slow-release fertilizer nitrogen is higher than the nitrogen uptake of corn . After 30 days, the release rate of slow-release fertilizer nitrogen slowed down, but still increased with the increase of corn nitrogen absorption, and the release fertilizer released nitrogen at a fixed ratio slightly lower than the corn nitrogen absorption . Until the 50th day of the corn planting period, after the amount of nitrogen released by the slow-release fertilizer and the amount of nitrogen absorbed by the corn both reached their peaks, the amount of nitrogen released by the slow-release fertilizer was synchronized with the amount of nitrogen absorbed by the corn at a fixed ratio. Decrease, not only to ensure the whole process of corn growth process for nitrogen needs, but also ...

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Abstract

The invention relates to a compound fertilizer sustained release agent and a preparation method of the compound fertilizer sustained release agent. The sustained release agent comprises the following components by weight: 100 parts of phenol, 10 to 20 parts of water, 90 to 105 parts of formaldehyde and 10 to 15 parts of urea. The preparation method comprises the following steps: firstly, adding 100 parts of melted phenol and 10 to 20 parts of water in a polyreactor according to the mass ratio, heating and stirring as well as uniformly mixing, adding 3 to 9 parts of sodium hydroxide according to the mass ratio when the temperature is increased to 60 to 65 DEG C, regulating the PH value to 7.5 to 9, then adding 90 to 105 parts of formaldehyde according to the mass ratio, reacting for 70 to 90 minutes at the temperature of 65 to 70 DEG C, continuously reacting for 60 to 120 minutes when the temperature is increased to 70 to 80 DEG C, and finally, adding 10 to 15 parts of urea according to the mass ratio to react for 30 to 60 minutes. The sustained release agent is taken as a resin material slowly dissolved in water, and can not only form a nano-molecular structure with nutrients in an adsorption manner, but also be degraded by microbes not to destruct soil.

Description

Technical field: [0001] The invention relates to the technical field of slow-release and controlled-release fertilizers, in particular to a compound fertilizer slow-release agent. Background technique: [0002] There are mainly two types of wrapping materials for slow-release fertilizers in the world: polymer resin and sulfur. [0003] The production method of the existing sustained-release agent is mainly formed by resin or sulfur coating, and the resin used in the existing sustained-release material generally includes one of polyurethane, epoxy resin, unsaturated polyester, phenolic resin and furan resin. or more, are generated by lipidation reaction. The resin can be used alone or sprayed on the surface of the fertilizer together with sulfur to seal the fertilizer particles and achieve the purpose of controlling the release of fertilizer nutrients. [0004] The existing preparation method involving special controlled-release fertilizers is as follows: 5% and 6% of therm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 黄培钊段继贤张运森张建军
Owner SHENZHEN BATIAN ECOTYPIC ENG
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