Polyurethane-coated slow-release fertilizer and preparation method thereof

A coated slow-release, polyurethane technology, applied in the direction of layered/coated fertilizers, fertilization devices, fertilizer mixtures, etc., can solve the problems of poor elasticity, poor degradability, and easy to be dissolved by water of inorganic coated fertilizers. Good low temperature resistance, simple and reasonable process, good degradability

Inactive Publication Date: 2015-04-22
ZIBO ZHENGDA ENERGY SAVING NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Chemical fertilizers play an important role in agricultural production and can increase yields by more than 55%. However, chemical fertilizers have the phenomenon of instant dissolution in water, concentrated release, and low utilization rate. Coated slow-release fertilizers have been applied to agricu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] The parts by weight of each raw material are:

[0033] Polyether polyol (functionality is preferably 3, molecular weight is preferably 1500) 100 parts, diisocyanate (TDI-80) 45 parts, epoxy resin (E-44) 22 parts, curing agent (E-100) 42 parts.

[0034] The preparation method of polyurethane coated slow-release fertilizer is:

[0035] (1) Preparation of epoxy modified prepolymer

[0036] Add the measured polyether polyol into the flask, reduce pressure to -0.090MPa, stir and heat to 110℃, vacuum dehydration for 2.4h, then cool to 40℃, add epoxy resin, stir for 30min, add diisocyanate, temperature control React at 85°C for 2.5 hours; after the reaction is completed, start to cool down and vacuum degas for 20 minutes, cool to room temperature and discharge, to obtain an epoxy modified prepolymer with a -NCO of 7%;

[0037] (2) Preparation of polyurethane coated fertilizer

[0038] A modified fluidized bed parallel spray method is used for coating. When coating, an...

Example Embodiment

[0040] Example 2

[0041] The parts by weight of each raw material are:

[0042] 95 parts of polyether polyol (DDL-1000D), 40 parts of diisocyanate (TDI-80), 20 parts of epoxy resin (E-44), and 40 parts of curing agent (E-100).

[0043] The preparation method of polyurethane coated slow-release fertilizer is:

[0044] (1) Preparation of epoxy modified prepolymer

[0045] Add the measured polyether polyol into the flask, reduce pressure to -0.085MPa, stir and heat to 100℃, vacuum dehydration for 3h, then cool to 45℃, add epoxy resin, stir for 20min, add diisocyanate, and control the temperature at 80°C, react for 3h; after the reaction is complete, start to cool down and vacuum degas for 30min, cool down to room temperature and discharge, to obtain epoxy modified prepolymer with -NCO of 5%;

[0046] (2) Preparation of polyurethane coated fertilizer

[0047] A modified fluidized bed parallel spray method is used for coating. When coating, an independent spray system sprays the prepolymer ...

Example Embodiment

[0049] Example 3

[0050] The parts by weight of each raw material are:

[0051] 100 parts of polyether polyol (DDL-1000D), 50 parts of diisocyanate (TDI-80), 25 parts of epoxy resin (E-44), and 45 parts of curing agent (E-100).

[0052] The preparation method of polyurethane coated slow-release fertilizer is:

[0053] (1) Preparation of epoxy modified prepolymer

[0054] Add the measured polyether polyol into the flask, reduce pressure to -0.098MPa, stir and heat to 120°C, vacuum dehydration for 2h, then cool to 50°C, add epoxy resin, stir for 25min, add diisocyanate, and control the temperature at 90°C, react for 2h; after the reaction is completed, start cooling and vacuum degassing for 10 minutes, cooling to room temperature and discharging to obtain an epoxy modified prepolymer with a -NCO of 9%;

[0055] (2) Preparation of polyurethane coated fertilizer

[0056] A modified fluidized bed parallel spray method is used for coating. When coating, an independent spray system sprays the...

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PUM

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Abstract

The invention relates to a slow-release fertilizer and particularly relates to a polyurethane-coated slow-release fertilizer and a preparation method thereof. The polyurethane-coated slow-release fertilizer is prepared from an epoxy-modified prepolymer and a curing agent, wherein the epoxy-modified prepolymer is prepared from polyether glycol, diisocyanate and epoxy resin and contains 5-9% of -NCO, the functionality of polyether glycol is preferably 2-4, and the molecular weight of polyether glycol is preferably 1000-2000. The structure of a membrane material prepared from the prepolymer is regular, the polyurethane-coated slow-release fertilizer has the characteristics of high wear resistance, elasticity, degradability and good low-temperature resistance, and the breakdown phenomenon cannot be caused. The requirements of European union for solubility and preliminary solubility of the slow-release fertilizer are met. By using the preparation method provided by the invention, the process is simple and reasonable, no solvents are used in the production process, and harsh reaction conditions are not needed.

Description

technical field [0001] The invention relates to a slow-release fertilizer, in particular to a polyurethane-coated slow-release fertilizer and a preparation method thereof. Background technique [0002] Chemical fertilizers play an important role in agricultural production and can increase yields by more than 55%. However, chemical fertilizers have the phenomenon of instant dissolution in water, concentrated release, and low utilization rate. Coated slow-release fertilizers have been applied to agricultural production. However, the coated fertilizers on the market still have many defects. The inorganic coated fertilizers have poor elasticity and are prone to pinholes and cracks; the existing domestic organic coated fertilizers have poor wear resistance, poor degradability and are easily dissolved by water. Contents of the invention [0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a polyurethane coated slow-release fer...

Claims

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Application Information

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IPC IPC(8): C05G3/00C08G18/48C08G18/58C08G59/20
CPCC05G5/37C08G18/4045C08G18/48C08G18/58C08G59/20
Inventor 耿佃勇柴可军董伟
Owner ZIBO ZHENGDA ENERGY SAVING NEW MATERIAL
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