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Controlled-release fertilizer for corn and preparation method of controlled-release fertilizer

A technology for controlled release fertilizers and corn, applied in fertilizer mixtures, layered/coated fertilizers, nitrogen fertilizers, etc., can solve problems such as increasing labor costs, and achieve the effects of low production costs, improved controlled release period, and low dissolution rate.

Pending Publication Date: 2021-08-17
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the corn growth cycle, the usual fertilizer use requires secondary topdressing, which increases labor costs

Method used

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  • Controlled-release fertilizer for corn and preparation method of controlled-release fertilizer
  • Controlled-release fertilizer for corn and preparation method of controlled-release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0043] This preparation example provides a kind of controlled-release urea, and the preparation method is as follows:

[0044] Mix 20 parts of carboxymethyl cellulose, 100 parts of polyethylene oxide polyol, 10 parts of ethylene glycol, and 5 parts of sulfuric acid, then quickly heat up to 160°C and react for 90 minutes, and wait until the solvent turns into a brown-black liquid and cool to 25°C That is to realize the graft copolymerization of cellulose and polyether polyol to obtain liquefied cellulose. At 85°C, pour 480g of urea into the fluidized bed to preheat for 15 minutes. After the preheating is completed, add 3mL of liquid paraffin, and then slowly drop 25g of a mixture containing toluene diisocyanate and liquefied cellulose (n(NCO):n(OH)=1:1) into the fluidized bed for urea coating reaction. The reaction is completed in 15 minutes, and the controlled-release urea is prepared after the urea particles are completely coated.

preparation example 2

[0046] This preparation example provides a kind of controlled-release urea, and the preparation method is as follows:

[0047] After mixing 10 parts of carboxylated cellulose nanofibers, 110 parts of polyoxypropylene polyol, 5 parts of glycerin, and 8 parts of phosphoric acid, the temperature was quickly raised to 160 ° C for 90 minutes, and the solvent turned into a brown-black liquid and cooled to 25 °C to achieve graft copolymerization of cellulose and polyether polyol to obtain liquefied cellulose. At 85°C, pour 500g of urea into the fluidized bed to preheat for 15 minutes. After the preheating is completed, add 5mL of liquid paraffin, and then slowly drop 30g of the mixture containing p-phenylene diisocyanate and liquefied cellulose (n(NCO):n(OH)=1:1) into the fluidized bed for the coating reaction of urea . The reaction is completed in 15 minutes, and the controlled-release urea is prepared after the urea particles are completely coated.

preparation example 3

[0049] This preparation example provides a kind of controlled-release urea, and the preparation method is as follows:

[0050] Mix 30 parts of methyl propyl cellulose, 90 parts of polytetrahydrofuran, 15 parts of butanediol, and 3 parts of nitric acid, then quickly heat up to 160°C and react for 90 minutes, and wait until the solvent turns into a brown-black liquid and cool to 25°C. Liquefied cellulose is obtained by grafting and copolymerizing cellulose and polyether polyol. At 85°C, pour 450g of urea into the fluidized bed to preheat for 15 minutes. After preheating is completed, add 1mL of liquid paraffin, and then slowly drop 15g of a mixture containing diphenylmethane diisocyanate and liquefied cellulose (n(NCO):n(OH)=1:1) into the fluidized bed for urea coating. Membrane reaction. The reaction is completed in 15 minutes, and the controlled-release urea is prepared after the urea particles are completely coated.

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Abstract

The invention provides a controlled-release fertilizer for corn and a preparation method of the controlled-release fertilizer. The controlled-release fertilizer for corn comprises controlled-release urea, urea and 15-15-15 universal compound fertilizer. The controlled-release fertilizer for the corn provided by the invention only needs to be applied once, so that the labor cost is reduced, meanwhile, the corn yield is high, and the controlled-release fertilizer can be adjusted in time according to soil conditions in different regions and is good in flexibility.

Description

technical field [0001] The invention belongs to the field of fertilizers, and in particular relates to a controlled-release fertilizer for corn and a preparation method thereof, in particular to a controlled-release fertilizer for corn with a long controlled-release period and a preparation method thereof. Background technique [0002] At present, in corn fertilization, compound fertilizers or mixed fertilizers formed by dismantling and mixing high-fertilizer fertilizers such as urea, diammonium phosphate, and potassium sulfate are the main ones. There are a lot of irrational fertilization phenomena in corn. The specific manifestations are that due to the difficulty of topdressing, the high-nitrogen formula is usually used, and the "one shot" fertilization method is adopted, resulting in excessive fertilization and low nutrient utilization efficiency. The supply of nitrogen fertilizer is mainly based on urea, but urea is released quickly and the loss of nutrients is also rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G5/30C05G3/40
CPCC05C9/00C05G3/00C05G5/30C05G3/40
Inventor 杨相东孙明雪李娟刘晓燕李春花
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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