Coated compound fertilizer and preparation thereof

A compound fertilizer and coating technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of long time required for residual film degradation, increased equipment investment costs, and high sealing requirements, and achieve excellent nutrient resistance and control functions. , Solve the problem of resource utilization and reduce the effect of nutrient loss

Active Publication Date: 2009-06-24
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the above-mentioned S-type controlled-release fertilizers is that each resin material has strict property requirements, and some are even intermediate products of chemical companies, which are generally not easy to obtain; in addition, the coating used in the production of the products Solvents such as benzene, xylene and halogenated hydrocarbons are highly toxic and even banned at home and abroad, so the requirements for the sealing of production equipment are very high, which increases the cost of equipment investment
In addition, the polymer coating materials for S-type controlled-release fertilizers manufactured abroad are all pure materials, which are expensive and take a long time for the residual film to degrade in the soil, which is easy to cause secondary pollution to the soil

Method used

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  • Coated compound fertilizer and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Preparation of coating solution

[0033] Measure solvent turpentine (density 0.865kg L -1 , boiling point 158-162°C, place of origin Fujian) 3.20L was added to the dissolving pot ( figure 1 shown in 5). Accurately weigh 60.0 g of waste polystyrene foam (purchased from a waste product recycling company in the market), 60.0 g of recycled polypropylene pellets (purchased from a waste product recycling company in the market), low-density polyethylene (injection molding grade, melt flow rate 7g / 10min) ; purchased from China Petrochemical Corporation) 40.0g, modified cornstarch 20.0g (200-300 mesh, cornstarch is added modifying agent (aluminate coupling agent, produced by Fujian Normal University Macromolecule Experimental Factory) in a high-speed mixer ) and heated to a constant temperature of 110°C, maintained for 15-20 minutes and then discharged to obtain the modified starch), added together with a dissolving tank, stirred to raise the temperature and kept at 135-150°C...

Embodiment 2

[0045] Measure solvent turpentine (density 0.865kg L -1 , boiling point 158-162°C, place of production Fujian) 3.20L was added to the dissolving tank (shown in 5 in Figure 2). Accurately weigh 40.0 g of waste polystyrene foam (purchased from a waste product recycling company in the market), 60.0 g of recycled polypropylene pellets (purchased from a waste product recycling company in the market), low-density polyethylene (injection molding grade, melt flow rate 7g / 10min) ; Purchased from Sinopec Corporation) 60.0g, cornstarch 10.0g (200-300 mesh, purchased from the market), add into the dissolving tank together, stir and heat up and keep it at 135-150°C for about 1h, add 20.0g of talcum powder after the polymer is completely dissolved (1500 mesh) to obtain a uniformly dispersed dispersion system, that is, to obtain a coating solution for coating operations.

[0046] Weighing compound fertilizer (N:P:K=22:11:13, particle diameter 2-3mm, Batian Ecological Engineering Co., Ltd. p...

Embodiment 3

[0049] Measure solvent turpentine (density 0.865kg L -1 , boiling point 158-162°C, place of origin Fujian) 3.20L was added to the dissolving pot ( figure 1 shown in 5). Accurately weigh 60.0 g of waste polystyrene foam (purchased from a waste product recycling company in the market), 60.0 g of recycled polypropylene pellets (purchased from a waste product recycling company in the market), low-density polyethylene (injection molding grade, melt flow rate 7g / 10min) (purchased from China Petrochemical Corporation) 40.0g, cornstarch 20.0g (200-300 mesh, purchased from the market), add the dissolving tank together, stir and heat up and keep it at 135-150°C for about 1h, add talcum powder 60.0g after the polymer is completely dissolved g (1500 mesh), to obtain a uniformly dispersed dispersion, that is, to obtain a coating solution for coating operations.

[0050] Weigh Batian compound fertilizer (N:P:K=22:11:13, particle diameter 2-3mm, Batian Ecological Engineering Co., Ltd. prod...

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Abstract

The invention discloses an S type coated compound fertilizer and a preparation method thereof. The S type coated compound fertilizer comprises compound fertilizer granules and a coating wrapped on the surface of the granulated fertilizer; wherein, the material for preparing the coating comprises the substances based on the mass portion ratio: 15-27 portions of polystyrene foam, 24-30 portions of recovered Polypropylene polymers, 7-20 portions of low density polyethylene, 10-45 portions of inorganic mineral dust and 2-9 portions of starch or modified starch. The S type coated compound fertilizer has an excellent S type nutrient dissolving mode, can control the release time and amount of nitrogen, phosphorus and potassium nutrient in an intelligentized way, and meets different needs of agricultural production such as culture of seedling, contact fertilizer application and one-off application.

Description

technical field [0001] The invention relates to a film-coated compound fertilizer with an S-type nutrient dissolution mode and a preparation method thereof. Background technique [0002] Fertilizer is the grain of crops, and fertilizer (especially chemical fertilizer) has made a major contribution to the food and fiber needed to meet the increasing population of the world. It is estimated that the contribution of fertilizer to the increase of food crop production is about 40%-50%. In recent years, the low fertilizer utilization rate, waste of resources and environmental pollution caused by unreasonable fertilization methods (fertilization amount and fertilization method) in production are gradually attracting the attention and worries of scholars, governments and all walks of life on the above problems. [0003] Scientific fertilization is one of the important guarantee measures for sustainable agricultural development. In order to improve the utilization rate of fertilizers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 曹兵杨俊刚许俊香倪小会徐秋明刘宝存
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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