Controlled release fertilizer coated by vegetable oil based polyurethane and preparation method thereof

A vegetable oil-based, controlled-release fertilizer technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of low continuous level, non-degradable membrane materials, and high production costs, and achieve simple film forming process, excellent mechanical properties, The effect of high adhesion

Inactive Publication Date: 2013-09-18
上海永通生态工程股份有限公司
2 Cites 70 Cited by

AI-Extracted Technical Summary

Problems solved by technology

In my country, the coating-type controlled-release fertilizer prepared by dissolving polymer materials, such as polyolefin materials, etc. in an organic solvent, and then spraying coated fertilizer particles is relatively matu...
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Abstract

The invention discloses a controlled release fertilizer coated by vegetable oil based polyurethane and a preparation method thereof. The preparation method of the controlled release fertilizer coated by vegetable oil based polyurethane comprises the following steps of: 1) preheating the granular fertilizer; 2) heating plant oil polyhydric alcohol containing 2-6 hydroxys and isocyanate containing at least two isocyanate groups, and uniformly mixing the ingredients to form a vegetable oil based polyurethane coating liquid; 3) spray coating the vegetable oil based polyurethane coating liquid on the surfaces of the preheated fertilizer granules, repeatedly spray coating the vegetable oil based polyurethane coating liquid for 2-10 times after the vegetable oil based polyurethane coating liquid solid is solidified to obtain the controlled release fertilizer coated by vegetable oil based polyurethane. According to the controlled release fertilizer coated by vegetable oil based polyurethane and the preparation method thereof provided by the invention, the adopted coating material is extensive in resource, cheap and liable to obtain, non-toxic, harmless, simple in production process and good in controlled release effect of fertilizer.

Application Domain

Fertilizer mixtures

Technology Topic

FertilizerIsocyanate +10

Examples

  • Experimental program(3)

Example Embodiment

[0029] Example 1
[0030] Step 1), weigh 1kg of 15-15-15 compound fertilizer particles with a particle size of 3mm-4mm, place them in the coating machine, turn on the coating machine to preheat the fertilizer particles until the temperature of the fertilizer particles reaches 70 ℃ and keep.
[0031] Step 2) Weigh 18.9g castor oil, add 1.7g glycerin, 1.08g microcrystalline paraffin; weigh 16.3g polymethylene polyphenyl polyisocyanate, add 2g diethylene glycol dibenzoate; heat separately . After the microcrystalline paraffin is completely melted, the two are mixed and stirred uniformly to form a vegetable oil-based polyurethane coating liquid.
[0032] Step 3) Pour the well-stirred and evenly mixed vegetable oil-based polyurethane coating solution prepared in step 2) slowly onto the surface of the preheated fertilizer particles in step 1), and continue to heat and keep warm for in-situ polymerization, about 5-6 minutes After that, the heating function is turned off, and the fertilizer particles are automatically rotated to completely disperse.
[0033] Step 4), after a total of 15 minutes, apply the same second layer, and then apply it to the 6% coating rate. After the vegetable oil-based polyurethane coating liquid is solidified, the fertilizer particles are rotated for 10-15 minutes to facilitate the complete maturation of the reaction film. After the fertilizer particles are cooled, the finished product can be taken out to prepare the vegetable oil-based polyurethane coated controlled-release fertilizer.
[0034] The controlled release performance of the coated controlled-release fertilizer prepared above was measured by the HG/T4215-2011 standard. The release period is 90 days, the initial nutrient release rate is 0.013%, the 28-day cumulative nutrient release rate is 19.197%, and the 90-day cumulative nutrient release rate The release rate was 85.158%, and the controlled release effect was good.

Example Embodiment

[0035] Example 2
[0036] Step 1) Weigh 1kg of 15-15-15 compound fertilizer particles with a particle size of 3mm-4mm, place them in the coating machine, turn on the coating machine to preheat the fertilizer until the temperature of the fertilizer particles reaches 75°C And kept.
[0037] Step 2) Weigh 19.75g soybean oil, add 1.78g glycerin, 1.13g microcrystalline wax; weigh 15.34g polymethylene polyphenyl polyisocyanate, add 2g diethylene glycol dibenzoate; heat separately . After the microcrystalline paraffin is completely melted, the two are mixed and stirred uniformly to form a vegetable oil-based polyurethane coating liquid.
[0038] Step 3) Pour the well-stirred and evenly mixed vegetable oil-based polyurethane coating solution prepared in step 2) slowly onto the surface of the preheated fertilizer particles in step 1), and continue to heat and keep warm for in-situ polymerization, about 5-6 minutes After that, the heating function is turned off, and the fertilizer particles are automatically rotated to completely disperse.
[0039] Step 4), after a total of 15 minutes, apply the same second layer, and then apply it to the 6% coating rate. After the vegetable oil-based polyurethane coating liquid is solidified, the fertilizer particles are rotated for 10-15 minutes to facilitate the complete maturation of the reaction film. After the fertilizer particles are cooled, the finished product can be taken out to prepare the vegetable oil-based polyurethane coated controlled-release fertilizer.
[0040] The controlled release performance of the coated controlled-release fertilizer prepared above was measured with the HG/T4215-2011 standard. The release period is 90 days, the initial nutrient release rate is 0.035%, the 28-day cumulative nutrient release rate is 25.234%, and the 90-day cumulative nutrient release The release rate was 95.325%, and the controlled release effect was good.

Example Embodiment

[0041] Example 3
[0042] Step 1), weigh 1kg of 15-15-15 compound fertilizer particles with a particle size of 3mm-4mm, put them in the coating machine, turn on the coating machine to preheat the fertilizer until the temperature of the fertilizer particles reaches 80°C And kept.
[0043] Step 2), weigh 23.5 g of peanut oil, add 0.52 g of glycerin, 1.3 g of microcrystalline wax; weigh 12.67 g of polymethylene polyphenyl polyisocyanate, add 2 g of diethylene glycol dibenzoate, and heat separately. After the microcrystalline paraffin is completely melted, the two are mixed and stirred uniformly to form a vegetable oil-based polyurethane coating liquid.
[0044] Step 3) Pour the well-stirred and evenly mixed vegetable oil-based polyurethane coating solution prepared in step 2) slowly onto the surface of the preheated fertilizer particles in step 1), and continue to heat and keep warm for in-situ polymerization, about 5-6 minutes After that, the heating function is turned off, and the fertilizer particles are automatically rotated to completely disperse.
[0045] Step 4), after a total of 15 minutes, apply the same second layer, and then apply it to the 6% coating rate. After the vegetable oil-based polyurethane coating liquid is solidified, the fertilizer particles are rotated for 10-15 minutes to facilitate the complete maturation of the reaction film. After the fertilizer particles are cooled, the finished product can be taken out to prepare the vegetable oil-based polyurethane coated controlled-release fertilizer.
[0046] The controlled release performance of the coated controlled-release fertilizer prepared above was measured by the HG/T4215-2011 standard. The release period is 90 days, the initial nutrient release rate is 0.0825%, the 28-day cumulative nutrient release rate is 32.185%, and the 90-day cumulative nutrient release The release rate was 89.852%, and the controlled release effect was good.
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PUM

PropertyMeasurementUnit
Particle size3.0 ~ 4.0mm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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