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Resin-coated urea and preparation method thereof

A technology of resin coating and urea, applied in the direction of urea compound fertilizer, layered/coated fertilizer, nitrogen fertilizer, etc., to achieve the effects of making up for surface defects, prolonging the release period, and reducing the dissolution rate

Inactive Publication Date: 2015-06-03
BEIJING FUTELAI COMPOUND FERTILIZER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above patents all use pre-coating materials that have nothing to do with the raw materials of the resin film layer.

Method used

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  • Resin-coated urea and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Preparation of resin-coated urea

[0028] Weigh 13g polystyrene (purchased from Beijing Yanshan Petrochemical, model is 666D, melt index is 8g / 10min), 14.6g low-density polyethylene (purchased from Beijing Yanshan Petrochemical, model is LD100AC, melt index is 2g / 10min), 18.3g linear low-density polyethylene (purchased from Yangzi Petrochemical, model 1801, melt index 1g / 10min), 24.1g talcum powder and 3.2g starch, mixed in 1.8L tetrachlorethylene solvent at 120-130°C Obtain the coating solution.

[0029] Place 1 kg of urea granules in the spray tower, control the temperature of the dry hot air at 90-100° C., and 10 g of polymethylene polyphenyl polyisocyanate (purchased from Bayer, Germany, brand Desmodur 44V20L) under the baking of hot air Added to the urea surface through a nozzle to form a pre-coat. After 1 minute, the above-mentioned coating solution was sprayed onto the surface of the suspended and fluidized urea particles through a nozzle, and after t...

Embodiment 2

[0033] Example 2 Preparation of resin-coated urea

[0034] Weigh 31.3g polystyrene (purchased from Beijing Yanshan Petrochemical, model is 666D, melt index is 8g / 10min), 6.8g low-density polyethylene (purchased from Beijing Yanshan Petrochemical, model is 1F7B, melt index is 7g / 10min) , 29.9g linear low density polyethylene (purchased from Tianjin Petrochemical, model is 9085, melt index is 0.7g / 10min), 54.4g talcum powder and 13.6g starch, in 1.95L turpentine solvent, mix at 130-140 ℃ Obtain the coating solution.

[0035] Put 1 kg of urea granules in the spray tower, control the temperature of the dry hot air at 90-100 °C, add 1 g of liquefied MDI (purchased from Yantai Wanhua, model PMM-10) to the surface of the urea through the nozzle under the support of the hot air , forming a precoat. After 1 minute, the coating solution was sprayed onto the surface of the suspended and fluidized urea particles through a nozzle, and the solvent was volatilized to prepare a coated ferti...

Embodiment 3

[0036] Example 3 Preparation of resin-coated urea

[0037] Take by weighing 31.4g polystyrene (purchased by waste recycling companies in the market), 20.2g low-density polyethylene (purchased from Beijing Yanshan Petrochemical, the model is LD160AS, and the melt index is 4g / 10min), 21.3g linear low-density polyethylene ( Purchased from Tianjin Petrochemical, model is 9085, melt index is 0.7g / 10min), 31.4g talcum powder and 7.8g starch, mixed in 2.2L turpentine solvent at 130-140°C to obtain coating solution.

[0038] Put 1kg of urea granules in the spray tower, control the temperature of the dry hot air at 90-100°C, and add 6g of toluene diisocyanate to the surface of the urea through the nozzle under the heating of the hot air to form a pre-coating layer. After 1 minute, spray the above-mentioned coating solution onto the surface of the suspended and fluidized urea particles through a nozzle, and obtain a coated fertilizer with a coating rate of 10% after the solvent evaporat...

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Abstract

The invention provides resin-coated urea. The resin-coated urea consists of urea, a pre-coating layer and an overlying resin coating, wherein the pre-coating layer is isocyanate; the mass of the isocyanate accounts for that of 0.05-1.5 percent of the urea; the resin coating comprises the following components in parts by weight: 17-28 parts of polystyrene, 5-18 parts of low-density polyethylene, 19-30 parts of linear low-density polyethylene, 28-45 parts of talc powder and 4-10 parts of starches. The resin-coated urea provided by the invention has a high S-shaped nutrient dissolution mode, and can meet different requirements on agricultural production, such as contact fertilizer application and disposable fertilizer application.

Description

technical field [0001] The invention relates to the field of coated fertilizers, in particular to a resin-coated urea and a preparation method thereof. Background technique [0002] Polymer-coated fertilizer is a fertilizer that uses polymer materials to form a thin film on the surface of the fertilizer, quantitatively controls the amount and release period of nutrients in the fertilizer, and makes the nutrient supply consistent with the fertilizer requirements of crops in each growth period. One of the key and hot directions. Since the fertilizer core and the polymer coating material belong to two different types of chemical substances, the surface morphology of the fertilizer core will also have a relatively large impact on the coating effect. Therefore, the pretreatment or precoating technology of the fertilizer core is very important. US 5374292 adopts two coating pretreatment technologies of water + triethanolamine + glycerin and polyester polyol. In US 6039781, lins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
CPCC05C9/00C05G3/90C05G5/30
Inventor 李文艺
Owner BEIJING FUTELAI COMPOUND FERTILIZER
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