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Environment-protection type coated release-controlled urea and preparing method

A controlled-release urea, environment-friendly technology, applied in the direction of urea compound fertilizer, nitrogen fertilizer, fertilizer mixture, etc., can solve the problems of long release period of controlled-release urea particles, difficult degradation of membrane materials, long complete release time, etc., to achieve enhanced soil Water retention, improved pore properties, and reduced production costs

Inactive Publication Date: 2006-10-25
中国民用航空学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since 2000, Beijing Forestry Research Institute and Chinese Academy of Agricultural Sciences have successfully researched polymer-coated urea. Although trial production has been carried out, it has been difficult to fully promote it so far.
Controlled-release urea granules generally have two cases of complete and incomplete envelopes. For the former, because the polymer film is relatively dense, nitrogen can hardly be released during the period of plant nutrient demand, resulting in this part of controlled-release. The release period of urea granules is too long; for the latter, nitrogen is released quickly. Generally speaking, it is difficult for this type of controlled-release urea to meet the nutritional needs of plants in the middle stage. The long release time also leads to poor fertilizer efficiency to a certain extent. Ideal and certain fertilizer loss
Third, synthetic resin-like polymers are used to coat urea, and the membrane material is difficult to degrade. To a certain extent, there are environmental problems and cannot be used for a long time.
At present, there is no method of using special controlled-release additives to adjust the performance of controlled-release urea and reduce costs and related reports

Method used

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  • Environment-protection type coated release-controlled urea and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The first step: main material equipment: sieve, grade and dry the granular urea, weigh 1000 grams of 2-3mm granular urea for later use;

[0034] Step 2: Prepare the coating solution: weigh 35 grams of tung oil, 0.9 grams of liquid paraffin, and 0.15 grams of cobalt catalyst; stir them on an electric mixer or a magnetic stirrer, mix well and make a coating solution for use ;

[0035] The third step: prepare coating powder: take 70 grams of talcum powder and 5 grams of calcium stearate respectively, put them in a mixer and mix them evenly to make coating powder for later use;

[0036] Step 4: Put 1,000 grams of granular urea into the drum-type or cylinder-type coating machine, set the speed of the coating machine to 40 rpm, and start the coating machine so that the granular urea can roll well in the coating machine; Half of the coating liquid prepared in the second step is evenly sprayed on the surface of urea, and blown with 50°C hot air to make the surface sticky;

[...

Embodiment 2

[0041] Step 1: Sieve, classify and dry the granular urea, weigh 1000 grams of 3-4mm granular urea for use;

[0042] Step 2: Weigh 50 grams of tung oil, 0.825 grams of liquid paraffin, 0.15 grams of cobalt catalyst, and 0.1 grams of amphiphilic active agent OP and mix them uniformly to form a coating solution.

[0043] Step 3: Mix 30 grams of talcum powder and 1 gram of calcium stearate in a mixer to make coating powder.

[0044] Step 4: Set the speed of the coating machine to 15 rpm, spray 1 / 2 of the coating liquid evenly, and blow it with hot air at 40°C;

[0045] Step 5: Sprinkle the coating powder prepared in the third step on the granular urea slowly, continue to rotate the coating machine, and blow it with hot air to harden the surface;

[0046] Step 6: Repeat step 4, then weigh 30 grams of talcum powder and sprinkle it evenly on the surface of urea granules. After coating evenly, add 0.825 grams of liquid paraffin and roll the urea granules for a certain period of time....

Embodiment 3

[0048] The first step: Weigh 1000 grams of 4-5mm granular urea, 20 grams of tung oil, 28 grams of talcum powder, 0.45 grams of liquid paraffin, 5 grams of calcium stearate (or magnesium stearate), 0.1 grams of cobalt catalyst, amphiphilic activity Agent 0P 0.1 g;

[0049] Step 2: Fully mix tung oil, liquid paraffin, and cobalt catalyst to make coating liquid;

[0050] Step 3: Mix 1 / 2 talcum powder, calcium stearate or magnesium stearate in a mixer to make coating powder;

[0051] Step 4: Set the speed of the coating machine to 30 rpm, take half of the liquid prepared in the second step, and spray it evenly, and blow it with hot air to make the surface sticky;

[0052] Step 5: Sprinkle the remaining 1 / 2 talcum powder on the granular urea slowly, continue to rotate the coating machine, and blow it with hot air to harden the surface. All the other are with embodiment 1.

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Abstract

This invention discloses environmental protection style envelope control release urea and its preparation method. It solves problem of high cost and hard degradation of film in existing fertilizer. It is consisted by urea core and external layer envelope, the envelope is made up by natural silicate mineral powder, natural grease raw material and control releasing additive. Particle urea occupies 89.9-94.9 percent of the product; envelope material occupies 5.1-10.1 percent. Preparation procedures are that urea sieving, drying, envelope liquor and envelope powder preparation, enveloping, drying and packaging. The cost is low; its price is large lower than homogeneous product in and out country, nothing chemical components are contained in the enveloping material. Material, generating process and product using are environmental protected, and there is no solid and liquid and gas waste discharging. If it is used long time, it can change soil structure, and make soil loosen and enhance soil water keeping ability, it can preferably absorb and store moisture at certain time after nutrition releasing, generating equipment and technique are simple, and easy to large scale generating, nitrogen content is 41.1-43.7 percent.

Description

technical field [0001] The invention relates to a controlled-release urea and a preparation method thereof, in particular to a green and environment-friendly controlled-release urea and a preparation method thereof with popularization and practical value. technical background [0002] Controlled Release Fertilizers (Slow / Controlled Release Fertilizers, CRFs) is a combination of modern plant nutrition and fertilization theory and controlled release high-tech, and considers the law of crop nutrition requirements, adopts nano-control technology to control the release period and amount of fertilizer nutrients in the soil, Novel fertilizers that coordinate or synchronize their nutrient release patterns with crop nutrient uptake (MA; Zhongxin Ryan; Thomas; Donald R.; Ciaccio; Corinne G.. Controlled release fertilizers based on self-assembled molecule coatings[P].U.S.Pat .;6540808, 2003-04-01). Slow / controlled release fertilizers can be formulated according...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G3/90
Inventor 李酽郭英张楠栗建钢刘秀琳苏景新
Owner 中国民用航空学院
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