The invention relates to the technical field of
high polymer materials, and particularly discloses a hydrophobic controlled-release
coating material and a preparation method thereof.The hydrophobic controlled-release
coating material comprises a material P and a material I according to the
mass ratio of 100: 70-110; the material P is prepared from the following components in parts by
mass: 15 to 55 parts of modified recycled regenerated oil, 10 to 30 parts of
dicarboxylic acid, 5 to 20 parts of
propylene glycol, 10 to 50 parts of polyhydric alcohols, 1 to 3 parts of amine catalysts, 2 to 4 parts of
amino acid derivatives and 1 to 3 parts of
modified starch; the material I is prepared from the following components in parts by
mass: 1 to 3 parts of
glyceryl behenate and 10 to 14 parts of
vegetable oil-based
isocyanate; hydrogenated modified recycled regenerated oil is used as a base material to provide a long-chain hydrophobic skeleton and active carboxyl,
glyceryl behenate provides a
crystallization hydrophobic micro-area, and an amine catalyst and an
amino acid derivative cooperate to reduce reaction
activation energy; through hydrophobic
network construction, cross-linking enhancement and degradation regulation, a
coating structure with high hydrophobicity and precise
controlled release is formed; the material is degradable, does not pollute soil, has good hydrophobicity, and can effectively control the
dissolution rate of the chemical
fertilizer.