Hydrophobic-material-coated environment-friendly coated slow release fertilizer and preparation method thereof

Abstract

The invention discloses a hydrophobic-material-coated environment-friendly coated slow release fertilizer and a preparation method thereof. The hydrophobic-material-coated environment-friendly coated slow release fertilizer is prepared from the following raw materials in parts by weight: 8-15 parts of carboxymethylcellulose, 10-20 parts of acrylic acid, 20-30 parts of a sodium alginate solution, 5-10 parts of hydroxyethyl cellulose, 1-2 parts of ammonium persulfate, 3-6 parts of N,N-methylene bisacrylamide, 1-2 parts of citric acid, 15-25 parts of polyvinyl alcohol, 3-5 parts of starch, 25-35 parts of urea, 8-15 parts of potassium hydrogen phosphate and 50-100 parts of distilled water. A water-retaining agent is added into crosslinking liquid to obtain a mixture, and the mixture is sprayed to a core of the fertilizer, so that the defect that the water-retaining agent is easy to fall after being directly adhered to the core of the fertilizer is overcome, and the water-retaining effect of the fertilizer is remarkable; meanwhile, the crosslinking liquid has the effect of improving the water resistance of the fertilizer; and by utilizing a hydrophobic coated material as a coat of an inner layer of the fertilizer, a relatively good slow release effect is achieved.

Description

technical field [0001] The invention relates to a slow-release fertilizer, in particular to a method for preparing an environmentally friendly coated slow-release fertilizer coated with a hydrophobic material. [0002] technical background [0003] Coated slow / controlled release fertilizer is based on granular chemical fertilizer, and the surface is coated with a layer of slightly water-soluble inorganic or organic polymer, which can change the release characteristics of fertilizer nutrients, prolong or control the release of fertilizer nutrients, A new type of fertilizer that coordinates the release of nutrients with the fertilizer requirements of crops. The development of this kind of fertilizer has put forward new ideas for improving fertilizer utilization rate, reducing environmental pollution, and developing labor-saving and labor-saving modern agriculture. Therefore, researchers in fertilizer science, soil science, environmental science, chemistry and other disciplines...

AI Technical Summary

Problems solved by technology

[0004] Ni Boli prepared a water-retaining slow-release fertilizer by using sodium alginate and polyacrylic acid in his postgraduate dissertation "Preparation and Performance Research of Environmentally Friendly Multifunctional Slow- and Controlled-Release Fertilizer", but there are still water-retaining agents that are easy to fall off, including The water resistance of the membrane needs to be improved, and the slow release performance is not good.