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S type controlled-release urea and preparing method thereof

A technology for controlled release of urea and urea granules, applied in urea compound fertilizers, nitrogen fertilizers, fertilizer mixtures, etc., can solve the problems of very high sealing requirements, difficult to obtain, increased equipment investment costs, etc., and achieves low cost, easy operation, The effect of excellent nutrient blocking function

Active Publication Date: 2008-11-12
湖南金叶众望科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the above-mentioned S-type controlled-release fertilizers is that each resin material has strict property requirements, and some are even intermediate products of chemical companies, which are generally not easy to obtain; in addition, the coating used in the production of the products Solvents such as benzene, xylene and halogenated hydrocarbons are highly toxic and even banned at home and abroad, so the requirements for the sealing of production equipment are very high, which increases the cost of equipment investment

Method used

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  • S type controlled-release urea and preparing method thereof
  • S type controlled-release urea and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1. Preparation of S-type controlled release urea

[0037] 1. Preparation of coating solution

[0038] Measure solvent turpentine oil (density 0.865g / cm 3 , Boiling point of 158-162℃, origin of Fujian) 2.50L added to dissolving irrigation ( figure 2 Shown in 5). Accurately weigh 40.0g of waste polystyrene foam (purchased by market waste recycling company), linear low-density polyethylene (injection grade, melt flow rate 0.7g / 10min; purchased from Sinopec) 30.0g, modified starch 5g (200-300 mesh, add modifier (aluminate coupling agent, produced by Fujian Normal University Polymer Experimental Factory) of corn starch in a high-speed mixer and heat to a constant temperature of 110 ℃, maintain for 15-20 minutes, then discharge That is to obtain modified starch), add the dissolving pot, stir and heat up to 130°C, heat and stir at constant temperature for about 1h, after the polymer is completely dissolved, add 70g talc (1500 mesh), heat up to 140°C and keep stirring evenl...

Embodiment 2

[0049] Example 2. Preparation of S-type controlled release urea

[0050] 1. Preparation of coating solution

[0051] Measure solvent turpentine oil (density 0.865g / cm 3 , Boiling point 158-162℃, origin Fujian) 3.00L was added to dissolving irrigation. Accurately weigh 40.0g of waste polystyrene foam (purchased by a market waste recycling company), low-density polyethylene (model-1F7B, melt flow rate 7.0g / 10min; purchased from Beijing Yanshan Petrochemical Company) 10g, linear low-density poly Ethylene (injection grade, melt flow rate 0.7g / 10min; purchased from Sinopec) 30.0g, modified starch 6g (200-300 mesh, add modifier (aluminate couple) to corn starch in a high-speed mixer Coupling agent, produced by Macromolecule Experimental Factory of Fujian Normal University) and heated to a constant temperature of 110 ℃, maintained for 15-20 minutes, the modified starch will be obtained after discharging), and add the dissolving pot together ( figure 2 5) After stirring and heating to 130...

Embodiment 3

[0055] Example 3 Preparation of S-type controlled release urea

[0056] 1. Preparation of coating solution

[0057] Measure solvent turpentine oil (density 0.865g / cm 3, Boiling point 158-162℃, origin Fujian) 3.00L was added to dissolving irrigation. Accurately weigh 40.0 g of waste polystyrene foam (purchased by a market waste recycling company), 10 g of low-density polyethylene (model-1F7B, melt flow rate 7.0g / 10min; purchased from Beijing Yanshan Petrochemical Company), linear low-density poly Ethylene (injection grade, melt flow rate 0.7g / 10min; purchased from Sinopec) 30.0g, modified starch 5g (200-300 mesh, add modifier (aluminate couple) to corn starch in a high-speed mixer Coupling agent, produced by Fujian Normal University Polymer Experimental Factory) and heated to a constant temperature of 110 ℃, maintained for 15-20 minutes, the modified starch will be obtained after discharging), and add the dissolving pot together ( figure 2 5) After stirring and heating to 130°C, he...

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Abstract

The invention discloses an S-type controlled release urea and a method for making the same. The S-type controlled release urea comprises urea particles and envelopes which are wrapped on the urea particles, wherein, the material making the envelopes comprises the following compositions by weight portion: 22 to 28 portions of polystyrene foam, 0 to 11 portions of low density polyethylente, 17 to 23 portions of linear low density polyethylene, 35 to 48 portions of inorganic mineral powder, and 3 to 5 portions of starch or modified starch. The S-type controlled release urea has excellent S-type nutrient dissolution mode, intelligently controls the nutrient release time and number, and satisfies different requirements of the agricultural production such as culture of seedling, fertilization in contact and the fertilization for one time.

Description

Technical field [0001] The invention relates to an S-type controlled release urea and a manufacturing method thereof. Background technique [0002] Nitrogen is one of the most important nutrients necessary for plants. Nitrogen fertilizer has become the world's largest fertilizer variety in terms of production and application rates. However, due to unreasonable fertilization methods in production and the very active characteristics of nitrogen in the soil (which can be lost through ammonia volatilization, nitrification and denitrification, and nitrate leaching), the current global utilization of nitrogen fertilizer is not high. The utilization rate of nitrogen fertilizer for grain crops in developed countries is about 50%, while the average nitrogen utilization rate for grain crops in my country is lower, only about 35%. The low utilization rate of nitrogen fertilizer not only causes economic losses and waste of resources, but also causes increasingly serious problems. Environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05C9/00C05G3/90
Inventor 曹兵徐秋明刘宝存杨俊刚许俊香李亚星范京松郝赟倪小会谷佳林衣文平杨宜斌
Owner 湖南金叶众望科技股份有限公司
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