Straw liquefied coating liquid and preparation method and application thereof

A technology of straw and coating, applied in application, fertilizer mixture, fertilization device, etc., can solve the problem of unavoidable uniform mixing of mixture, achieve the effect of accelerating in-situ reaction speed, good controlled release performance, and avoiding negative effects

Active Publication Date: 2015-11-04
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural polymer is added to the polyurethane system as an active filler. Although it can act as a crosslinking agent and a filler at the same time, it is difficult to avoid the inherent uniform mixing of the mixture when the natural polymer is added to the system in solid form.

Method used

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  • Straw liquefied coating liquid and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1, the preparation of straw liquefaction coating solution and its controlled-release fertilizer

[0050] as per figure 1 The process shown in the preparation of straw liquefaction coating liquid and its controlled-release fertilizer, the specific steps are as follows: 100g of corn stalk powder with a particle size of 80 mesh, a liquefaction agent consisting of 350g of polyethylene glycol 400 and 50g of glycerin, and 8g of concentrated sulfuric acid Acidic catalyst composed of 1.7g tungsten trioxide and 1.3g surfactant Tween-80, mixed evenly in a reaction kettle equipped with mechanical stirring and condenser tube, heated to 160°C under constant stirring, and reacted at constant temperature for 60 minutes , then stop the reaction by cooling in an ice-water bath, filter and remove the residue in the liquefied product, the resulting 450g liquid is the straw liquefied product, and the residue returns to continue liquefaction; add 22.5g of auxiliary microcrystalli...

Embodiment 2

[0052] Example 2, Preparation of Straw Liquefaction Coating Solution and Controlled Release Fertilizer

[0053] as per figure 1 The process shown in the preparation of the straw liquefaction coating solution and its controlled release fertilizer, the specific steps are as follows: 100g of rice straw powder with a fineness of 40 mesh, a liquefaction agent consisting of 200g of polyethylene glycol 200 and 50g of ethylene glycol, and 6g of The catalyst composed of sulfuric acid and 1.5g of tungsten trioxide and 0.5g of surfactant Tween-20 were mixed evenly in a reaction kettle equipped with mechanical stirring and condenser, then the temperature was raised to 180°C under constant stirring, and the reaction was carried out at constant temperature for 40 minutes. , then stop the reaction by cooling in an ice-water bath, filter out the residue in the liquefied product, and obtain 300 g of liquid as straw liquefied product, and return the residue to continue liquefaction; add 9 g of ...

Embodiment 3

[0055] Example 3, Preparation of Straw Liquefaction Coating Liquid and Controlled Release Fertilizer

[0056] as per figure 1 The process shown in the preparation of straw liquefaction coating liquid and its controlled release fertilizer, the specific steps are as follows: 100g fineness of 60 mesh peanut shell powder, liquefaction agent composed of 490g polyethylene glycol 600 and 110g diethylene glycol, 9g A catalyst composed of sulfuric acid and 2g of tungsten trioxide and 1.7g of surfactant Tween-60 was mixed evenly in a reaction kettle equipped with mechanical stirring and a condenser tube, then the temperature was raised to 140°C under constant stirring, and the reaction was carried out at a constant temperature for 120 minutes. Then stop the reaction by cooling in an ice-water bath, filter and take out the residue in the liquefied product, the obtained 630g liquid is the straw liquefied product, and the residue returns to continue liquefaction; add 63g of auxiliary agent...

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Abstract

The invention discloses methods for a straw liquefied coating liquid and a coated controlled-release fertilizer. The preparation method of the coating liquid comprises the steps: mixing straw, a liquefying agent, an acidic catalyst and a surfactant, carrying out a reaction, and removing a residue in the reaction system, to obtain a filtrate which is a straw liquefied product; and then carrying out a mixing reaction of the straw liquefied product with polyether polyol, an alkaline catalyst and an auxiliary agent, and thus obtaining the straw liquefied coating liquid. The preparation method of the coated controlled-release fertilizer comprises the steps: preheating fertilizer granules, then simultaneously atomizing the straw liquefied coating liquid and a curing agent onto the surface of the fertilizer granules, to obtain the straw liquefied coated controlled-release fertilizer. The coated controlled-release fertilizer provided by the invention utilizes compounding of heteropolyacid and inorganic acid to catalyze liquefaction of a straw powder; while the alkaline catalyst in the straw liquefied coating liquid is used for acid-alkali adjustment of the straw liquefied product, the in-situ reaction speed is accelerated, and thus the controlled-release characteristic of the coated controlled-release fertilizer is improved.

Description

technical field [0001] The invention relates to a straw liquefaction coating liquid, a preparation method and application thereof, and belongs to the technical field of coating fertilizers. Background technique [0002] Coated controlled-release fertilizer refers to a new type of fertilizer that can adjust the release rate and supply intensity of nutrients according to the nutrient demand characteristics of plants in different growth stages, so that the nutrient release mode can be synchronized with crop fertilizer absorption, which not only improves the utilization rate of fertilizers, but also The pollution caused by chemical fertilizers to the environment is reduced. [0003] At present, according to different preparation processes, coated controlled-release fertilizers are mainly divided into three types: organic solvent type, water type and in-situ reaction film-forming type. The organic solvent type is made by dissolving polyolefin or recycled waste plastic in organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 李丽霞王军卓曹兵李鸿雁肖强倪小会杨宜斌衣文平刘宝存邹国元徐秋明
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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