Preparation method of special controlled-release fertilizer for Chinese water chestnuts

Abstract

The invention discloses a preparation method of special controlled-release fertilizer for Chinese water chestnuts. After fertilizer core is prepared from urea, potassium chloride, calcium phosphate, microelement fertilizer, an inhibitor and a dispersant, the fertilizer core is subjected to inner coating treatment with an inner coating agent consisting of polylactic acid, polyethylene glycol and ethyl alcohol and then subjected to outer coating treatment with an outer coating agent consisting of polyacrylate, EPDM (ethylene-propylene-diene monomer) rubber, modified starch, acetone and water, and the special controlled-release fertilizer for the Chinese water chestnuts is obtained. Compared with the prior art, the obtained controlled-release fertilizer has sufficient nutrient elements and high nitrogen fertilizer utilization rate, has controlled-release performance and can meet the nutrition requirement of the Chinese water chestnuts in each growth period; meanwhile, outer coats can be recycled and are environment-friendly, inner coats can be completely degraded, and the surroundings are not damaged.

Description

technical field

[0001] The invention relates to the field of controlled-release fertilizers, in particular to a method for preparing a special controlled-release fertilizer for horseshoes. Background technique

[0002] Water chestnut is a common name for water chestnuts. Water chestnuts are bulbs of water chestnuts belonging to the genus Plantaceae, a perennial herb native to India. In my country, they are mainly distributed in Jiangxi, Guangxi, Jiangsu, Anhui, Zhejiang, Guangdong and other wet areas. The skin of horseshoe is purple-black, the meat is white, sweet and juicy, crisp and delicious. It has been known as "Underground Sydney" since ancient times, and northerners regard it as "Jiangnan ginseng". Horseshoe can be used as both a fruit and a vegetable, and is a popular seasonal product.

[0003] The nutrients needed by horseshoes in the growth and development process come from the photosynthesis of lotus leaves on the one hand; Although fish feces and residual bait ...

Examples

Embodiment 1

[0036] 1) Preparation of fat core

[0037] Add 140 parts of urea, 120 parts of potassium chloride, 90 parts of calcium phosphate, 3 parts of borax, 3 parts of zinc sulfate, and 2 parts of manganese sulfate. After crushing through a 150-mesh sieve, add 5 parts of 3,4-dimethylpyrazole phosphate 6 parts, 6 parts of polyvinylamide, stir evenly, granulate according to conventional method in granulator, obtain fertilizer core.

[0038] 2) Preparation of coating agent

[0039] Weigh 4 parts of polylactic acid, 3 parts of polyethylene glycol, and 2 parts of ethanol, and make an inner coating agent according to the coating process; weigh 6 parts of polyacrylate, 1 part of EPDM rubber, and 3 parts of modified starch. 2 parts, 2 parts of acetone, and 2 parts of water, according to the coating process, the outer coating agent is made. Among them, the coating process and the inner coating process are as follows: after adding the required raw materials into the reactor, heat up to 80°C, s...

Embodiment 2

[0044]1) Preparation of fat core

[0045] Add 200 parts of urea, 170 parts of potassium chloride, 140 parts of calcium phosphate, 6 parts of borax, 5 parts of zinc sulfate, and 4 parts of manganese sulfate. After crushing through a 200-mesh sieve, add 3,4-dimethylpyrazole phosphate 9 10 parts, 10 parts of polyvinylamide, stir evenly, and granulate in a granulator according to a conventional method to obtain a fertilizer core.

[0046] 2) Preparation of coating agent

[0047] Weigh 10 parts of polylactic acid, 9 parts of polyethylene glycol, and 4 parts of ethanol, and make an inner coating agent according to the coating process; weigh 15 parts of polyacrylate, 4 parts of EPDM rubber, and 5 parts of modified starch. 4 parts, 4 parts of acetone, and 4 parts of water are made into an outer coating agent according to the coating process. Among them, the coating process and the inner coating process are as follows: after adding the required raw materials into the reactor, heat up...

Embodiment 3

[0052] 1) Preparation of fat core

[0053] Add 180 parts of urea, 150 parts of potassium chloride, 120 parts of calcium phosphate, 5 parts of borax, 5 parts of zinc sulfate, and 3 parts of manganese sulfate. After crushing through a 200-mesh sieve, add 3,4-dimethylpyrazole phosphate 6 8 parts, 8 parts of polyvinylamide, stir evenly, granulate according to conventional method in granulator, obtain fertilizer core.

[0054] 2) Preparation of coating agent

[0055] Weigh 7 parts of polylactic acid, 7 parts of polyethylene glycol, and 3 parts of ethanol according to the coating process to obtain an inner coating agent; weigh 13 parts of polyacrylate, 2 parts of EPDM rubber, and 4 parts of modified starch , 3 parts of acetone, and 4 parts of water are made into an outer coating agent according to the coating process. Among them, the coating process and the inner coating process are as follows: after adding the required raw materials into the reactor, the temperature is raised to ...

technical field

[0001] The invention relates to the field of controlled-release fertilizers, in particular to a method for preparing a special controlled-release fertilizer for horseshoes. Background technique

[0002] Water chestnut is a common name for water chestnuts. Water chestnuts are bulbs of water chestnuts belonging to the genus Plantaceae, a perennial herb native to India. In my country, they are mainly distributed in Jiangxi, Guangxi, Jiangsu, Anhui, Zhejiang, Guangdong and other wet areas. The skin of horseshoe is purple-black, the meat is white, sweet and juicy, crisp and delicious. It has been known as "Underground Sydney" since ancient times, and northerners regard it as "Jiangnan ginseng". Horseshoe can be used as both a fruit and a vegetable, and is a popular seasonal product.

[0003] The nutrients needed by horseshoes in the growth and development process come from the photosynthesis of lotus leaves on the one hand; Although fish feces and residual bait ...

Examples

Embodiment 1

[0036] 1) Preparation of fat core

[0037] Add 140 parts of urea, 120 parts of potassium chloride, 90 parts of calcium phosphate, 3 parts of borax, 3 parts of zinc sulfate, and 2 parts of manganese sulfate. After crushing through a 150-mesh sieve, add 5 parts of 3,4-dimethylpyrazole phosphate 6 parts, 6 parts of polyvinylamide, stir evenly, granulate according to conventional method in granulator, obtain fertilizer core.

[0038] 2) Preparation of coating agent

[0039] Weigh 4 parts of polylactic acid, 3 parts of polyethylene glycol, and 2 parts of ethanol, and make an inner coating agent according to the coating process; weigh 6 parts of polyacrylate, 1 part of EPDM rubber, and 3 parts of modified starch. 2 parts, 2 parts of acetone, and 2 parts of water, according to the coating process, the outer coating agent is made. Among them, the coating process and the inner coating process are as follows: after adding the required raw materials into the reactor, heat up to 80°C, s...

Embodiment 2

[0044]1) Preparation of fat core

[0045] Add 200 parts of urea, 170 parts of potassium chloride, 140 parts of calcium phosphate, 6 parts of borax, 5 parts of zinc sulfate, and 4 parts of manganese sulfate. After crushing through a 200-mesh sieve, add 3,4-dimethylpyrazole phosphate 9 10 parts, 10 parts of polyvinylamide, stir evenly, and granulate in a granulator according to a conventional method to obtain a fertilizer core.

[0046] 2) Preparation of coating agent

[0047] Weigh 10 parts of polylactic acid, 9 parts of polyethylene glycol, and 4 parts of ethanol, and make an inner coating agent according to the coating process; weigh 15 parts of polyacrylate, 4 parts of EPDM rubber, and 5 parts of modified starch. 4 parts, 4 parts of acetone, and 4 parts of water are made into an outer coating agent according to the coating process. Among them, the coating process and the inner coating process are as follows: after adding the required raw materials into the reactor, heat up...

Embodiment 3

[0052] 1) Preparation of fat core

[0053] Add 180 parts of urea, 150 parts of potassium chloride, 120 parts of calcium phosphate, 5 parts of borax, 5 parts of zinc sulfate, and 3 parts of manganese sulfate. After crushing through a 200-mesh sieve, add 3,4-dimethylpyrazole phosphate 6 8 parts, 8 parts of polyvinylamide, stir evenly, granulate according to conventional method in granulator, obtain fertilizer core.

[0054] 2) Preparation of coating agent

[0055] Weigh 7 parts of polylactic acid, 7 parts of polyethylene glycol, and 3 parts of ethanol according to the coating process to obtain an inner coating agent; weigh 13 parts of polyacrylate, 2 parts of EPDM rubber, and 4 parts of modified starch , 3 parts of acetone, and 4 parts of water are made into an outer coating agent according to the coating process. Among them, the coating process and the inner coating process are as follows: after adding the required raw materials into the reactor, the temperature is raised to ...