Method for preparing polyurethane-polyurea coated fertilizer

A technology of polyurethane polyurea and polyurethane prepolymer, applied in fertilizer forms, fertilizer mixtures, fertilization devices, etc., can solve the problems of unsatisfactory controlled release effect, easy occurrence of pinholes and cracks, complicated implementation process, etc. Effects of leaching loss, good physical properties, wide range of raw materials

Inactive Publication Date: 2010-06-23
晋盾防护(山西)科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the coating materials used at home and abroad have many defects such as poor film elasticity, brittleness, prone to pinholes and cracks after coating, poor wear resistance, complicated implementation process, high cost or unsatisfactory controlled release effect, etc. Moreover, during the packaging, storage, transportation and batching process of fertilizer granules, the film is easily damaged due to friction and collision, and the expected sufficient controlled release cannot be achieved.

Method used

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  • Method for preparing polyurethane-polyurea coated fertilizer
  • Method for preparing polyurethane-polyurea coated fertilizer
  • Method for preparing polyurethane-polyurea coated fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Put 500g of polyoxypropylene glycol with a molecular weight of 1000 into a reactor equipped with a stirrer, a thermometer and a vacuum connecting pipe, stir and heat, and dehydrate for 3 hours at a vacuum degree of 0.08MPa and a temperature of 120°C. After cooling down to 50°C, 204.5g of toluene diisocyanate T-80 was added, the temperature was raised, and the reaction was carried out at 70°C. When the mass fraction of NCO reached 8.05%, vacuum defoaming was performed at 0.08 MPa for 15 min, and then the prepolymer was cooled to room temperature for use.

[0045] The chemical fertilizer is coated by the impact mixing spray method. In the spray drying equipment, the temperature of the chemical fertilizer is raised to 60°C, the fan frequency is set to 45Hz, the nozzle atomization pressure is 1.1Mpa, the inlet air temperature is 65°C, and the spraying speed is 0.4Kg / h. The above-mentioned prepolymer and the chain extender diethyltoluene diamine E-100 are mixed in the spray ...

Embodiment 2

[0047] Put 500g of polyoxypropylene diol with a molecular weight of 2000 into a reactor equipped with a stirrer, a thermometer and a vacuum connecting pipe, stir and heat, and dehydrate at a vacuum degree of 0.085MPa and a temperature of 110°C for 2.5h. After cooling down to 45°C, add 26.3g of epoxy resin E-44 and stir rapidly for 30min, then add 140.5g of toluene diisocyanate T-80, and heat up to 80°C for reaction. When the mass fraction of NCO reaches 7%, vacuum defoaming is performed at 0.085 MPa for 15 min, and then the prepolymer is cooled to room temperature for use.

[0048] The chemical fertilizer is coated by the impact mixing spray method. In the spray drying equipment, the temperature of the chemical fertilizer is raised to 60°C, the fan frequency is set to 45Hz, the nozzle atomization pressure is 1.0Mpa, the inlet air temperature is 70°C, and the spraying speed is 0.5Kg / h. The above prepolymer and the chain extender diethyltoluene diamine E-100 enter into the spray...

Embodiment 3

[0050] Put 500g of polyoxypropylene glycol with a molecular weight of 1000 into a reactor equipped with a stirrer, a thermometer and a vacuum connecting pipe, stir and heat, and dehydrate for 2 hours at a vacuum degree of 0.09MPa and a temperature of 100°C. After cooling down to 40°C, add 42.2g of starch, stir rapidly for 60min, then add 203.5g of toluene diisocyanate T-80, and raise the temperature to 85°C for reaction. When the mass fraction of NCO reached 7.5%, vacuum defoaming was performed at 0.09 MPa for 15 min, and then the prepolymer was cooled to room temperature for use.

[0051] The chemical fertilizer is coated by the impact mixing spray method. In the spray drying equipment, the temperature of the chemical fertilizer is raised to 60°C, the fan frequency is set to 45Hz, the nozzle atomization pressure is 0.8Mpa, the inlet air temperature is 75°C, and the spraying speed is 0.6Kg / h. The above-mentioned prepolymer and chain extender diethyltoluene diamine E-100 enter ...

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Abstract

The invention relates to a method for preparing polyurethane-polyurea coated fertilizer, comprising the following steps: dehydrating polyether polyol to obtain dehydrated polyether polyol, adding polyisocyanate to the dehydrated polyether according to the molar ratio of NCO to OH of 2-5, heating the temperature of the mixture of the dehydrated polyether and the polyisocyanate to 70-90 DEG C, making the mixture of the dehydrated polyether and the polyisocyanate react until the mass of NCO being 5-9 percent of the mass of the product of reaction, defoaming the product of reaction in vacuum to obtain -NCO-ended polyurethane prepolymer, filling fertilizer in a spray dryer, heating the fertilizer to 60 DEG C, mixing the polyurethane prepolymer with amine chain extender according to the mass ratio of 7-8:1 to obtain spraying liquid by controlling the fan frequency at 45 Hz, the nozzle atomization air pressure at 0.7-1.2 MPa, the inlet air temperature at 20-80 DEG C and the spray rate at 0.4-0.6 Kg/h, spraying the spraying liquid whose mass is 7-10 percent of the mass of the fertilizer on to the fertilizer, and curing the coating film to obtain the polyurethane-polyurea coated fertilizer.

Description

technical field [0001] The invention relates to a preparation method of a film-coated controlled-release fertilizer, in particular to a preparation method of a film-coated controlled-release fertilizer with polyurethane polyurea as the film coating material. Background technique [0002] Controlled-release fertilizers can change the traditional fertilization method, simplify the fertilization procedure, and synchronize the sowing and fertilization, thereby greatly reducing agricultural labor intensity and improving labor productivity. Controlled-release fertilizers also have a slow-release and long-acting effect, which can greatly increase the utilization rate of fertilizers, save resources at the same yield level of the same crop, reduce fertilizer application, reduce costs, and increase farmers' income. [0003] As a new type of fertilizer, slow-release fertilizer has the characteristics of reducing nutrient loss, improving fertilizer use efficiency, and reducing environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/00C05G3/00
Inventor 宫涛白贵峰杨树竹李汾王英
Owner 晋盾防护(山西)科技有限公司
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