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Production method of melamine formaldehyde-polyvinyl formal fertilizer slow-release formulation

A technology of melamine formaldehyde and polyvinyl alcohol formaldehyde, which is applied in the direction of fertilizer mixture, fertilization device, application, etc., can solve the problem of increasing the complexity and processing time of the processing process, the consistent fertilizer effect release of coated fertilizers, and the difficulty of controlling the thickness of the coating, etc. problem, achieve the effect of reducing transportation, shortening time and saving energy

Active Publication Date: 2009-01-28
CNOOC FUDAO
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  • Abstract
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  • Application Information

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Problems solved by technology

The coating thickness of this product is difficult to control during the production process, which makes it difficult for the amount of fertilizer required by the different growth processes of crops to be consistent with the fertilizer release amount of the coated fertilizer
my country's Zhang Fudao and others have developed adhesive slow-release fertilizers, but they still belong to secondary processing slow-release fertilizers. The production method of this secondary processing slow-release fertilizer is characterized by further processing on the basis of finished fertilizers, which increases the processing time. The complexity and processing time are not conducive to large-scale production to a certain extent

Method used

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  • Production method of melamine formaldehyde-polyvinyl formal fertilizer slow-release formulation

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Embodiment

[0021] 1. Preparation of melamine formaldehyde-polyvinyl alcohol formaldehyde fertilizer slow-release agent

[0022] 1.1. Preparation of sol sodium silicate:

[0023] (1), 10%H at 200kg 2 SO 4 Add 20 kg of triethanolamine to the solution, stir evenly, and set aside.

[0024] (2) Add 100 kg of water glass to 900 kg of deionized water, stir and dissolve completely.

[0025] (3) Add 180kg of 10% H containing triethanolamine to the above water glass solution 2 SO 4 Stir evenly and adjust the pH to 12.0. After 1 hour, it will become sol agglomerates, which is sol water glass.

[0026] 1.2. Preparation of polyvinyl formal solution

[0027] (1) Add 940 kg of deionized water to the reactor, start the stirrer and low-pressure steam to heat up to 95°C.

[0028] (2) Add 60kg of polyvinyl alcohol, and it takes 1.5 hours to completely dissolve.

[0029] (3) Cool down to 82°C and adjust the pH to 2.0 with dilute hydrochloric acid.

[0030] (4) Add 24kg of formaldehyde solution, the feeding tube...

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Abstract

The invention discloses a production method for a melamine formaldehyde-polyvinyl alcohol formaldehyde fertilizer slow-release agent, which comprises the following steps: the preparation of melamine formaldehyde polymer solution, the preparation of polyvinyl formal solution, and the preparation of a slow-release agent. The production method makes use of the characteristics of the good water resistance of the melamine formaldehyde and sol-water glass, and the good caking property and flexibility of the polyvinyl formal to produce an endoplasmic slow-release agent with good combination with urea or compound fertilizer paste. The production method has the advantages of simple process, short production period, and the like; compared with slow-release urea or slow-release compound fertilizer by the secondary processing and production, the method can save energy and reduce transportation.

Description

Technical field [0001] The invention relates to a production method of a built-in slow-release agent for producing slow-release urea or slow-release compound fertilizer, in particular to a production method of a melamine formaldehyde-polyvinyl alcohol formaldehyde fertilizer slow-release agent. Background technique [0002] In order to improve fertilizer nitrogen utilization, scientists at home and abroad are committed to the research of slow-release fertilizers. At present, fertilizer particles are mainly coated to reduce the nutrient release rate. The process is to coat the slow and controlled release materials on the surface of the granular fertilizer after the materials are granulated, dried, cooled, and sieved. The coating thickness of the product is difficult to control during the production process, which makes it difficult for the amount of fertilizer required for different growth processes of crops to be consistent with the fertilizer effect release amount of the coated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 赵福军张夫道傅送保姚光前张昕照杨斌陈科宇
Owner CNOOC FUDAO
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