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
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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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