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Nitrogen, phosphorus and potassium ternary biodegradable polymers with slow and controlled release prepared by reactive extrusion

A reactive extrusion and biodegradation technology, applied in fertilizer mixtures, ammonium orthophosphate fertilizers, alkaline orthophosphate fertilizers, etc., can solve the problems of lack of slow and controlled release properties, difficult industrialized production, and complex preparation processes. To achieve the effect of improving physical and mechanical properties, good compatibility, simple and effective preparation process

Active Publication Date: 2021-11-09
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MKP has a high solubility and does not have slow and controlled release properties, so it is easy to lose, and the leaching of excess P will lead to the risk of eutrophication in rivers, lakes and seas
[0005] Nano-fertilizers have some excellent properties due to their nano-scale, so they have aroused widespread interest in recent years, but there are problems such as complex preparation processes and difficulties in industrial production.

Method used

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  • Nitrogen, phosphorus and potassium ternary biodegradable polymers with slow and controlled release prepared by reactive extrusion
  • Nitrogen, phosphorus and potassium ternary biodegradable polymers with slow and controlled release prepared by reactive extrusion
  • Nitrogen, phosphorus and potassium ternary biodegradable polymers with slow and controlled release prepared by reactive extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 3

[0046] A kind of method of the urea-formaldehyde / polybutylene succinate / potassium dihydrogen phosphate biodegradable polymer sustained and controlled release nano-composite material prepared by reactive extrusion, comprising the following steps:

[0047] (1) Preparation of MU: add formaldehyde and urea to the reactor, the molar ratio of the two is 1:1.1~1.4, then adjust the solution pH=9, react at 50°C, then freeze the reaction solution, suction filter, Finally, dry the solid in a vacuum oven, and then crush it to 50-80 mesh to obtain MU powder.

[0048] (2) The raw material PBS is dried and pretreated, and then the pretreated PBS, MU and MKP are mixed uniformly in a high-speed mixer according to the mass fractions shown in Table 1 to obtain UF / PBS / MKP with different mass ratios mixture.

[0049] (3) The UF / PBS / MKP mixtures of different mass ratios prepared above are respectively added to the twin-screw extruder for extrusion blending, and then the biodegradable polymer slow ...

Embodiment 4

[0053] Embodiment 4: as the preparation process of the MU-Ex of contrast

[0054] Add the dried MU powder into a twin-screw extruder and extrude to obtain MU-Ex as a control. The specific process parameters in the extrusion process are exactly the same as those in Examples 1-3.

Embodiment 5

[0055] Embodiment 5: as the preparation process of the pure PBS of contrast

[0056] The dried PBS was added into the twin-screw extruder and extruded to obtain pure PBS as a control. The specific process parameters in the extrusion process are exactly the same as those in Examples 1-3.

[0057] Table 2 is the tensile performance data table of the biodegradable polymer slow-controlled release nanocomposite UF / PBS / MKP of the present invention. Table 3 is the compression performance data table of the biodegradable polymer sustained and controlled release nanocomposite UF / PBS / MKP of the present invention.

[0058] Table 2

[0059]

[0060] table 3

[0061]

[0062]

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PUM

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Abstract

The invention relates to the field of biodegradable polymer slow-release and controlled-release nanocomposites, in particular to a urea-formaldehyde / polybutylene succinate / phosphate diphosphate prepared by reaction extrusion containing three nutrients, N, P, and K. Sustained and controlled release nanocomposites of potassium hydrogen biodegradable polymers. It includes the following steps: uniformly mix polybutylene succinate, methylol urea and potassium dihydrogen phosphate, and then extrude the mixture in a twin-screw extruder to obtain urea-formaldehyde / polybutylene succinate Alcohol ester / potassium dihydrogen phosphate biodegradable polymer slow and controlled release NPK nanocomposites. Through the temperature control in the extruder, the melt polycondensation reaction of methylol urea in the extrusion process produces urea formaldehyde, and the "cage effect" of urea formaldehyde and polybutylene succinate molecular chains and the relationship between components The hydrogen bond interaction of the hydrogen bond causes the potassium dihydrogen phosphate crystals dissolved in the water generated by the polycondensation reaction to be confined to the nanometer scale during the precipitation process, thereby preparing a nanocomposite material.

Description

technical field [0001] The invention relates to the field of biodegradable polymer slow-release and controlled-release nanocomposites, in particular to a urea-formaldehyde / polybutylene succinate / phosphate diphosphate prepared by reaction extrusion containing three nutrients, N, P, and K. Sustained and controlled release nanocomposites of potassium hydrogen biodegradable polymers. Background technique [0002] Urea-formaldehyde (UF) is a biodegradable N-containing polymer. So far, it is also the most important variety of chemical slow-release fertilizers. UF can be degraded by microorganisms, resulting in the slow release of N. However, there are obvious crystalline regions in UF, which makes it difficult to be degraded by microorganisms in a short period of time, so that the rate of releasing nutrient N is significantly lower than the demand for N for crop growth. In addition, the reaction of urea and formaldehyde to form UF is carried out in liquid, and the formaldehyde s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L61/24C05G3/00C05G3/40C05G5/12C08K3/32
CPCC05B7/00C05G3/00C08K2003/324C08K2201/011C08L67/02C08L2201/06C08L2203/16C08L61/24C08K3/32
Inventor 赵贵哲张伟刘亚青王磊张晓鹏向阳
Owner ZHONGBEI UNIV