Vegetable oil-based polyurethane coated fertilizer and preparation method thereof

A vegetable oil-based, polyurethane technology, applied in the direction of layered/coated fertilizers, fertilizer mixtures, nitrogen fertilizers, etc., can solve the problems of low coating rate, increased usage of coating materials, insufficient controlled release effect, etc., to improve surface hydrophobicity Sexuality, low price, cost reduction effect

Active Publication Date: 2021-01-01
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a vegetable oil-based polyurethane-coated fertilizer in order to overcome the deficiencies in the above-mentioned prior art that the controlled-release effect is insufficient and the amount of coating material used needs to be increased. The coverage rate achieves a good slow and controlled release effect, without increasing the amount of coating materials, effectively reducing costs, and being environmentally friendly

Method used

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  • Vegetable oil-based polyurethane coated fertilizer and preparation method thereof
  • Vegetable oil-based polyurethane coated fertilizer and preparation method thereof
  • Vegetable oil-based polyurethane coated fertilizer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0048] This embodiment provides a vegetable oil-based polyurethane-coated fertilizer, the specific preparation method of which is as follows:

[0049] S1. Prepare vegetable oil-based polyurethane coating fluid and nano carbon black dispersion:

[0050] Put castor oil and polymethylene polyphenyl diisocyanate into a single-necked round-bottomed flask, magnetically stir for 3 minutes, and then carry out vacuum (0.1kPa) degassing treatment to prepare vegetable oil-based polyurethane coating liquid. The mass ratio of castor oil to polymethylene polyphenyl diisocyanate is 35:18.

[0051] The nano-carbon black dispersion liquid was prepared by using n-hexane, and the mass fraction of the nano-carbon black dispersion liquid in the nano-carbon black dispersion liquid was 4%.

[0052] S2. get 2kg of urea granules with a particle diameter of 2 to 5mm and put them into a drum coater; get 62g of vegetable oil-based polyurethane coating solution, spray 20.66g of vegetable oil-based polyur...

Embodiment 2

[0056] The present embodiment provides a kind of vegetable oil-based polyurethane coated fertilizer. Compared with Example 1, the difference is that the amount of nano-carbon black added in step S3 is 3.65g, that is, nano-carbon black: the vegetable oil-based polyurethane coating used in the middle coating Liquid=0.18:1 (weight);

[0057] Other raw materials and steps are identical with embodiment 1.

Embodiment 3

[0059] This embodiment provides a vegetable oil-based polyurethane-coated fertilizer, the specific preparation method of which is as follows:

[0060] S1. Prepare vegetable oil-based polyurethane coating fluid and nano carbon black dispersion:

[0061] Put castor oil and polymethylene polyphenyl diisocyanate into a single-necked round-bottomed flask, magnetically stir for 3 minutes, and then carry out vacuum (0.1kPa) degassing treatment to prepare vegetable oil-based polyurethane coating liquid. The mass ratio of castor oil to polymethylene polyphenyl diisocyanate is 35:18.

[0062] The nano-carbon black dispersion liquid was prepared by using n-hexane, and the mass fraction of the nano-carbon black dispersion liquid in the nano-carbon black dispersion liquid was 4%.

[0063] S2. get 2kg of urea granules with a particle diameter of 2 to 5mm and put them into a drum coater; get 40g of vegetable oil-based polyurethane coating solution, spray 13.33g of vegetable oil-based polyur...

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Abstract

The invention discloses a vegetable oil-based polyurethane coated fertilizer and a preparation method thereof. The vegetable oil-based polyurethane coated fertilizer comprises fertilizer particles anda vegetable oil-based polyurethane coating, wherein the modified vegetable oil-based polyurethane coating comprises an inner layer coating, a middle layer coating and an outer layer coating which aresequentially coated from inside to outside; the inner layer coating and the outer layer coating are prepared from a vegetable oil-based polyurethane coating solution, and the middle layer coating isprepared from a vegetable oil-based polyurethane coating solution and nano carbon black. According to the fertilizer and the preparation method disclosed in the invention, nano carbon black which is low in surface energy, low in price and easy to obtain is doped into a plant oil-based polyurethane coating to construct a micro-nano super-hydrophobic coating, so that the plant oil-based polyurethanecontrolled-release fertilizer with an ultralow coating rate is prepared, and the nutrient content of the controlled-release fertilizer per unit mass is increased; the purposes of prolonging the controlled release effect of the coated fertilizer and reducing the dosage of the coating material can be achieved, the cost is relatively low, and the environment-friendly effect is achieved.

Description

technical field [0001] The invention relates to the technical field of controlled release fertilizers, in particular to a vegetable oil-based polyurethane coated fertilizer and a preparation method thereof. Background technique [0002] Fertilizer is the food for the growth of crops, and plays an important role in promoting crop yields. The amount of fertilizer application in my country is increasing year by year, but the yield increase rate per unit of fertilizer is obviously decreasing, and the seasonal utilization rate of nitrogen fertilizer is only about 30%. The main reason is that urea-based nitrogen fertilizers have problems of water dissolution, ammonification, and nitrification after use, and phenomena such as loss, volatilization, and transformation occur before they are used. Therefore, R&D and production have a high utilization rate, and avoiding fertilizer loss and waste is conducive to promoting the development of food in my country and the world. [0003] Sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40C05G3/90C05G5/30
CPCC05C9/00C05G3/00C05G3/40C05G3/90C05G5/30
Inventor 张超群梁敦盛卢其明
Owner SOUTH CHINA AGRI UNIV
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