Preparation method of water retention type controlled-release urea formaldehyde compound fertilizer

A urea-formaldehyde slow-release and compound fertilizer technology, which is applied to urea compound fertilizers, fertilizer mixtures, nitrogen fertilizers, etc., can solve the problems of mutual influence, weakened water-retaining slow-release effect, and poor water-retaining effect of water-retaining fertilizers, so as to prevent rapid collapse of water-absorbing swelling solution, good slow release of nitrogen, and low content of free formaldehyde

Active Publication Date: 2015-04-08
KINGENTA ECOLOGICAL ENG GRP +2
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Problems solved by technology

[0005] Chinese patent document 200710052235.5 discloses a water-retaining slow/controlled release fertilizer and its preparation method; Chinese patent document 03153942.4 discloses a water-retaining slow-release fertilizer; Chinese patent document 201210090652. Release fertilizer, Chinese patent document 2014102710005 discloses a water-retai

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  • Preparation method of water retention type controlled-release urea formaldehyde compound fertilizer
  • Preparation method of water retention type controlled-release urea formaldehyde compound fertilizer
  • Preparation method of water retention type controlled-release urea formaldehyde compound fertilizer

Examples

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Embodiment 1

[0041] A method for preparing a water-retaining urea-formaldehyde slow-release compound fertilizer, the steps of the production method are as follows:

[0042] (1) After adding water and oxidized starch in the polycondensation reactor, the temperature was raised to 85°C for gelatinization for 20 minutes, and urea with a nitrogen content of 46wt% was added to the polycondensation reactor through the urea feeding device, and the polycondensation was fed through the formaldehyde feeding device Add formaldehyde solution with a concentration of 37wt% into the reaction kettle, stir the urea to dissolve, add borax to the polycondensation reaction kettle to adjust the pH value to 8.7, raise the temperature to 60°C, and react at a constant temperature for 70 minutes, then add phosphoric acid with a concentration of 20wt% to adjust the pH value to 5.3, react at a constant temperature of 66°C for 45 minutes; then adjust the pH value to 7.0 with boric acid with a concentration of 20wt%, an...

Embodiment 2

[0055] Embodiment 2: a kind of preparation method of water-retaining type urea-formaldehyde slow-release compound fertilizer, step is with embodiment 1, and difference is that the mass ratio of step (2) starch and acrylic acid is: 1:0.1, and the mass ratio of starch and acrylamide is :1:0.03.

Embodiment 3

[0056] Embodiment 3: a kind of preparation method of water-retaining type urea-formaldehyde slow-release compound fertilizer, step is with embodiment 1, and difference is that the initiator described in step (2) is ammonium persulfate, and mineral soil is kaolin, the consumption of ammonium persulfate 5% of the mass of the starch, the amount of the crosslinking agent is 0.3% of the mass of the starch, and the amount of kaolin is 8% of the mass of the starch.

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Abstract

The invention relates to a preparation method of a water retention type controlled-release urea formaldehyde compound fertilizer. The preparation method comprises the following steps: (1) preparing a urea formaldehyde condensate liquid; (2) preparing a starch grafted copolymer; and (3) mixing nitrogen, phosphorus and potassium fertilizers, heating the mixture to be 60-85 DEG C in a granulation machine, adding the urea formaldehyde condensate liquid and the starch grafted copolymer into the granulation machine, and carrying out mixing granulation to enable the mixture of urea formaldehyde condensate and the starch grafted copolymer to coat the surface of the granulated fertilizer. According to the water retention type controlled-release urea formaldehyde compound fertilizer, the slow release of nutrients in soil is achieved, so that on the one hand, the utilization rate of the fertilizer is greatly improved; on the other hand, by virtue of a water-retention controlled-release layer formed after the crosslinking of the urea formaldehyde condensate and the starch grafted copolymer, the water retention capacity can be obviously improved, and free formaldehyde can be adsorbed, so that the water stability of soil is improved, the aggregate content and the soil fertility are increased, the quality control of soil is improved, and the release rates of nutrients of nitrogen, phosphorus and potassium are controlled.

Description

technical field [0001] The invention relates to a preparation method of a water-retaining urea-formaldehyde slow-release compound fertilizer, which belongs to the field of fertilizer production. Background technique [0002] China is a large agricultural country, and the development of agriculture is inseparable from water and fertilizers. China is the world's largest producer and consumer of chemical fertilizers, and at the same time, it is a country that is very short of water resources. According to statistics, my country's per capita water resource occupancy rate is only a quarter of the world's average. At the same time, from the statistics of fertilizer use from 1996 to 2008, it can be seen that my country's fertilizer use has shown a substantial growth pattern, but the grain The increase rate has not reached the same level. There are many reasons for this phenomenon, and the decrease of fertilizer and water utilization rate is an important reason for the decrease of y...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G3/90
CPCC05C9/00C05G3/00C05G3/90
Inventor 曹奇领范玲超张营郭宗端王震
Owner KINGENTA ECOLOGICAL ENG GRP
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