Preparation method for fertilizer slow-releasing agent
A fertilizer slow-release agent and slow technology, which is applied in the field of fertilizer slow-release agent preparation, can solve the problems of restricted use and popularization, high price and the like, and achieve the effects of good slow-controlling effect, low production cost and simple preparation method.
Inactive Publication Date: 2007-12-05
TIANJIN HANGU DISTRICT FUXIANG FERTILIZER PROCESSING FACTORY
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Problems solved by technology
CDD can suppress the degradation of GTUs, which are expensive and limit their use and promotion
Method used
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Experimental program
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Effect test
Embodiment
[0006] Embodiment: a kind of preparation method of fertilizer slow-release agent, add 42gDCD (0.5mol), water 200ml and 37% HCL42ml (0.5mol) in container, stir and dissolve, at 30 ℃, slowly add Na 2 S 2 o 3 ·H 2 O125g (0.5mol, dissolved in 200ml water) solution, add 2molL after stirring for 1 hour -1 NaOH solution makes the liquid slightly alkaline, crystallize overnight, filter, wash with a little cold water, and dry to obtain 45.8g of the product. Under full stirring, prepare 100g of fertilizer slow with 45g of amidinothiourea, 35g of dicyandiamide and 20g of borax. release agent.
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The process of preparing fertilizer slow releasing agent includes the following steps: dissolving 42 g or 0.5 mol of DCD and l42 ml 37 % concentration HCl solution or 0.5 mol of HCl in 200 ml of water through stirring at 30 deg.c; dropping 200 ml water solution of 125 g or 0.5 mol of Na2S2O3.H2O slowly within 20 min, and stirring to react for 1 hr; adding 2 mol/l concentration NaOH solution to make the solution become weak alkality; letting stand overnight to crystallize, filtering, washing with small amount of cold water and drying to obtain guanyl thiourea in 45.8 g; and mixing guanyl thiourea in 45 g, dicyanodiamide in 35 g and borax in 20 g to compound the fertilizer slow releasing agent in 100 g. The present invention has the advantages of excellent slow releasing function on nitrogen containing fertilizer, capacity of raising the utilization rate of nitrogen containing fertilizer, simple preparation process and low production cost.
Description
technical field [0001] The invention relates to a preparation method of a fertilizer slow-release agent. Background technique [0002] Fertilizer is the food of crops. How to improve the utilization rate of nitrogen-containing fertilizers is an important issue. Nitrification / urease inhibitors are important types of nitrogen fertilizers and nitrogen-containing compound fertilizer synergists. DCD is currently a widely used nitrification inhibitor. It has low applicability to different crops, different soils, different humidity, and different temperatures. GTU is an excellent nitrification inhibitor, which is easily decomposed by invertase in the soil. CDD can suppress the degradation of GTU, and GTU is expensive, which limits their use and promotion. Contents of the invention [0003] The object of the present invention is to overcome above-mentioned defective, a kind of preparation method of fertilizer sustained-release agent is provided. [0004] The technical scheme of...
Claims
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IPC IPC(8): C05G3/00
Inventor 杜云福
Owner TIANJIN HANGU DISTRICT FUXIANG FERTILIZER PROCESSING FACTORY
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