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Preparation method and coating method of biodegradable temperature-responsive slowly-controlled release fertilizer coating material

A temperature-responsive, slow- and controlled-release fertilizer technology, which is applied in fertilizer mixtures, layered/coated fertilizers, applications, etc., can solve the problems of long maintenance time of slow control, high energy consumption and cost, and many chemical additives. Achieve the effects of reducing fertilizer release, improving production efficiency, and overcoming poor degradation

Active Publication Date: 2017-04-26
HEILONGJIANG BAYI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the Chinese patent "A Temperature Sensitive Coating Material and Temperature Sensitive Slow and Controlled Release Fertilizer and Its Preparation Method (Publication No. CN106083336 A)", the sustained control time of the fertilizer is longer and the chemical additives are more, resulting in energy consumption and High cost, not conducive to degradation, easy to cause environmental pollution, not conducive to large-scale promotion of field crops

Method used

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  • Preparation method and coating method of biodegradable temperature-responsive slowly-controlled release fertilizer coating material
  • Preparation method and coating method of biodegradable temperature-responsive slowly-controlled release fertilizer coating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: 70 parts of crushed corn stalks, wheat stalks and sawdust (weight ratio 1:1:1) were placed in 165 parts of a buffer solution with a pH value of 8.5 for 10 minutes to disperse fully, and 9 parts of dopamine hydrochloride were added. Activation treatment at 35°C, during the activation process, air was introduced and stirred continuously, the activation time was 3 hours, filtered and washed, and vacuum-dried to obtain 41 parts of dopamine pretreated powder; in acetic acid / sodium acetate buffer solution Prepare 100 parts of enzyme solution with pH 5.5, laccase concentration of 103U / ml and vanillin concentration of 7.5mmol / L; place 41 parts of the obtained dopamine pretreated powder and 100 parts of the obtained enzyme solution in the reaction vessel Mix evenly in 50°C for secondary activation treatment. During the activation process, air is introduced and stirred continuously. The activation time is 1.5 hours, and 32 parts of secondary activated powder are obtaine...

Embodiment 2

[0028] Example 2: Put 75 parts of crushed corn stalks, wheat stalks and sawdust (weight ratio 1:1:1) into 180 parts of a buffer solution with a pH value of 10 for 15 minutes to disperse fully, add 10 parts of dopamine hydrochloride, Activation treatment at 40°C, during the activation process, air was introduced and stirred continuously, the activation time was 4 hours, filtered and washed, and vacuum-dried to obtain 45 parts of dopamine pretreated powder; in acetic acid / sodium acetate buffer solution Prepare 120 parts of enzyme solution with a pH of 6, laccase concentration of 145 U / ml and vanillin concentration of 9 mmol / L; place 45 parts of the obtained dopamine pretreated powder and 120 parts of the obtained enzyme solution in a reaction vessel Mix evenly, and perform secondary activation treatment at 60°C. During the activation process, air is introduced and stirred continuously. The activation time is 3 hours, and 40 parts of the secondary activated powder are obtained; th...

Embodiment 3

[0029]Example 3: Put 65 parts of crushed corn stalks, wheat straws and sawdust (weight ratio 1:1:1) into 150 parts of a buffer solution with a pH value of 8 for 5 minutes to disperse fully, add 8 parts of dopamine hydrochloride, Activation treatment at 30°C, during the activation process, air was introduced and stirred continuously, the activation time was 2 hours, filtered and washed, and vacuum-dried to obtain 35 parts of dopamine pretreated powder; in acetic acid / sodium acetate buffer solution Prepare 80 parts of enzyme solution with pH 4, laccase concentration of 60 U / ml and vanillin concentration of 2.5 mmol / L; place 35 parts of the obtained dopamine pretreated powder and 80 parts of the obtained enzyme solution in the reaction vessel Mix evenly in the medium, and perform secondary activation treatment at 40°C. During the activation process, air is introduced and stirred continuously. The activation time is 0.5 hours, and 25 parts of the secondary activated powder are obta...

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Abstract

The invention relates to a preparation method and coating method of a biodegradable temperature-responsive slowly-controlled release fertilizer coating material. Agricultural organic waste containing cellulose serves as the raw material and is crushed, sieved, modified with dopamine and subjected to enzyme activation secondary treatment, and activated powder is obtained; the activated powder is mixed with a thermo-sensitive poly phosphate ester monomer, an initiator and a beta-cyclodextrin accelerant, the mixture is heated and stirred, a free radical polymerization reaction is conducted under protection of the inert gas, and the biodegradable temperature-responsive slowly-controlled release fertilizer coating material is obtained after vacuum drying is conducted; and the biodegradable temperature-responsive slowly-controlled release fertilizer coating material is heated to be a molten state and smeared on surfaces of fertilizer particles in a coating machine, and coated slowly-controlled release fertilizer can be obtained. Dopamine-activated agricultural organic waste is adopted from the angle of bionics, a polymerization reaction is effectively promoted in combination with enzyme activation secondary treatment, and production efficiency is improved; and meanwhile, the thermo-sensitive poly phosphate ester monomer serves as a cross-linking agent, the beta-cyclodextrin serves as the accelerant, and polymerization reaction time is shortened, so that the fertilizer intelligently regulates and controls nutrients along with soil temperature change.

Description

technical field [0001] The invention belongs to the technical field of materials and slow-controlled release fertilizers, and in particular relates to a preparation method of a degradable temperature-responsive slow-controlled release fertilizer coating material and a coating method thereof. Background technique [0002] As a "high-tech environmental protection fertilizer in the 21st century", the slow-release fertilizer is to regulate the polymer coating on the surface of the fertilizer so that the nutrients wrapped in it are released slowly initially, prolonging the effective period for the crops to absorb and utilize the effective nutrients, so that the nutrients can be absorbed and utilized according to the set Fertilizers with slow or controlled release rate and release period, so as to improve fertilizer utilization efficiency and achieve the purpose of one-time fertilization and precise fertilization. [0003] Coating materials can be divided into three main forms: in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F230/02C08H8/00C05G3/00
CPCC05G5/37C08F289/00C08H8/00C08F230/02
Inventor 袁媛李司单李春生
Owner HEILONGJIANG BAYI AGRICULTURAL UNIVERSITY
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