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Biomass-based polymer coated controlled release fertilizer and production method thereof

A technology of controlled-release fertilizer and coating, which is applied in layered/coated fertilizers, organic fertilizers, fertilizer mixtures, etc., can solve the problem that petroleum resources are difficult to build a virtuous cycle of controlled-release fertilizers, and achieve secondary utilization, controlled-release, etc. Good performance, solve the effect of refractory degradation

Inactive Publication Date: 2016-08-17
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the monomers used are mainly organic chemical raw materials from petroleum, and its high price and depleting petroleum resources make it difficult to build a virtuous circle for the development of controlled-release fertilizers

Method used

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  • Biomass-based polymer coated controlled release fertilizer and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1, the preparation of co-liquefaction coating liquid and its controlled-release fertilizer

[0049] 1) According to such as figure 1 The process shown in the preparation of the co-liquefaction coating solution and its controlled release fertilizer, the specific steps are as follows: 100g of corn stalk powder with a particle size of 80 mesh, 48g of cornstarch, a liquefaction agent composed of 350g of polyethylene glycol 400 and 50g of glycerin, 8g of 98% concentrated sulfuric acid catalyst, mixed uniformly in a reaction kettle equipped with mechanical stirring and a condenser, then heated up to 160°C under constant stirring, carried out a co-liquefaction reaction for 100 minutes, then cooled with an ice-water bath to terminate the reaction, and precipitated to obtain 500g Co-liquefaction supernatant (that is, co-liquefaction), the residue left in the system continues to co-liquefaction;

[0050] 2) To 500g of the co-liquefaction supernatant (that is, the co-l...

Embodiment 2

[0053] Embodiment 2, the preparation of co-liquefaction coating liquid and its controlled-release fertilizer

[0054] 1) According to such as figure 1 The process shown to prepare the co-liquefaction coating solution and its controlled-release fertilizer is as follows: liquefy 160g of rice straw powder with a particle size of 40 mesh, 40g of corn starch, 320g of polyethylene glycol 200 and 80g of ethylene glycol. agent, 16g of 98% concentrated sulfuric acid catalyst, after mixing uniformly in a reaction kettle equipped with mechanical stirring and a condenser tube, the temperature was raised to 180°C under constant stirring, and the co-liquefaction reaction was carried out for 40 minutes, and then cooled with a cold water bath to terminate the reaction and precipitate Obtain 546g co-liquefaction supernatant (also co-liquefaction thing), the residue that stays in the system continues co-liquefaction;

[0055] 2) Add 16.9g of auxiliary microcrystalline wax, 10.3g of triethylene...

Embodiment 3

[0058] Embodiment 3, the preparation of co-liquefaction coating liquid and its controlled-release fertilizer

[0059] 1) According to such as figure 1 The process shown in the preparation of co-liquefied coating solution and its controlled release fertilizer, the specific steps are as follows: 140g of peanut shell powder with a particle size of 60 mesh, 47g of corn starch, liquefied with 327g of polyethylene glycol 600 and 73g of diethylene glycol agent, 12g of 98% concentrated sulfuric acid catalyst, after mixing evenly in a reaction kettle equipped with mechanical stirring and a condenser, the temperature was raised to 140°C under constant stirring, and the co-liquefaction reaction was carried out for 120 minutes, and then the reaction was terminated by cooling in an ice-water bath, and the precipitation Obtain 530g co-liquefaction supernatant (that is, co-liquefaction), and the residue left in the system continues to co-liquefy;

[0060] 2) In 530g of co-liquefaction super...

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Abstract

The invention discloses a biomass-based polymer coated controlled release fertilizer and a production method thereof. The production method of the biomass-based polymer coated controlled release fertilizer comprises the steps of 1) uniformly mixing up straw powders, starch, a liquefying agent and an acid catalyst, subjecting an obtained mixture to co-liquefaction reaction, cooling an obtained product after the completion of the reaction, collecting a supernatant, namely a co-liquefaction liquid; 2) uniformly mixing up the co-liquefaction liquid with polyether polyol, a basic catalyst and an auxiliary agent, and subjecting an obtained mixture to reaction to obtain a co-liquefaction coating liquid; 3) simultaneously spraying the co-liquefaction coating liquid and a curing agent onto a pre-heated fertilizer particle surface to form a film. In this way, the coated controlled release fertilizer is obtained. The nutrient release longevity of the coated controlled release fertilizer is 1 to 12 months. According to the technical scheme of the invention, the product obtained through the co-liquefaction reaction of easily liquefied powders and straws is adopted as one raw material of the coating material. In this way, not only the production cost is lowered, but also the difficult degradation problem of the film layer of the coated controlled-release fertilizer is also solved.

Description

technical field [0001] The invention belongs to the field of fertilizers, and relates to a biomass-based polymer-coated controlled-release fertilizer and a production method thereof. 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 specific preparation process of the in-situ reaction film-forming type is to directly spray the m...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05F11/00C05G5/30
Inventor 李丽霞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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