Unsaturated polyester coated controlled-release fertilizer prepared from PET wastes and preparation method thereof

A technology of controlled release fertilizer and polyester coating, applied in the direction of layered/coated fertilizer, fertilizer mixture, application, etc., can solve problems such as environmental pollution and resource waste, and achieve environmental pollution reduction, production cost reduction, and market prospects. expansive effect

Inactive Publication Date: 2016-07-13
INST OF PLANT PROTECTION & SOIL FERTILIZER HUBEI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid development of the polyester industry, according to statistics, in the process of polyester production and processing, about 3% to 5% will become waste. Utilization will not only cause a huge waste of res...

Method used

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  • Unsaturated polyester coated controlled-release fertilizer prepared from PET wastes and preparation method thereof
  • Unsaturated polyester coated controlled-release fertilizer prepared from PET wastes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The unsaturated polyester of the present embodiment is prepared by the following method, comprising the steps of:

[0042] (1) Put 1000g of PET waste, 200g of ethylene glycol, and 1g of zinc acetate catalyst into a reaction kettle equipped with a thermometer, an electric stirrer, a nitrogen inlet pipe and a fractionation device, heat up to 200°C for alcoholysis, and the alcoholysis time is After 2 hours, after the PET is completely dissolved and there are no suspended particles, the acid value in the reaction system is detected. When the acid value drops to 30mgKOH / g, the reaction is terminated, and the monomer and dimerization of the PET alcoholysis product terephthalic acid diol are obtained. A mixture of body and tetramer;

[0043] (2) After the PET alcoholysis reaction, lower the temperature of the kettle to 150°C, put in 550g of isophthalic acid, then gradually raise the temperature to 155°C, keep it warm for half an hour, and then raise the temperature to 200°C fo...

Embodiment 2

[0050] The preparation method of unsaturated polyester and unsaturated polyester-coated controlled-release fertilizer of this embodiment is the same as that of Example 1, the only difference is that the total coating amount of this embodiment is 7%, that is, coating solution 1, coating The ratios of liquid 2 and hot melt adhesive to the total weight of the fertilizer are 3%, 3%, and 1% respectively.

Embodiment 3

[0052] The preparation method of unsaturated polyester and unsaturated polyester-coated controlled-release fertilizer of this embodiment is the same as that of Example 1, the only difference is that the total coating amount of this embodiment is 8%, that is, coating solution 1, coating The ratios of liquid 2 and hot melt adhesive to the total weight of the fertilizer are 3%, 3%, and 2% respectively.

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Abstract

The invention relates to unsaturated polyester coated controlled-release fertilizer prepared from PET wastes and a preparation method thereof and belongs to the technical field of controlled-release fertilizers.The unsaturated polyester coated controlled-release fertilizer comprises granulated fertilizer 1, unsaturated polyester coating inner layers 2 on the surface of the granulated fertilizer 1, unsaturated polyester coating middle layers 3 on the surfaces of the coating inner layers 2, and unsaturated polyester coating outer layers 4 on the surfaces of the coating middle layers 3, and the weights of the coating inner layers 2, the coating middle layers 3 and the coating outer layers 4 account for 1-5%, 1-5% and 1-3% of total weight of the fertilizer, respectively, wherein unsaturated polyester is made by subjecting PET wastes, diol, a catalyst and an active diluent as raw materials to reactions such as alcoholysis, esterification and co-condensation.The controlled-release fertilizer with different release periods of time can be prepared by adjusting a coating ratio, the PET wastes are resourcefully reused, waste is turned into wealth, environmental pollution is reduced, and the production cost of the coated controlled-release fertilizer is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of slow- and controlled-release fertilizers, and relates to an unsaturated polyester-coated controlled-release fertilizer and a preparation method thereof. More specifically, the invention relates to an unsaturated polyester-coated controlled-release fertilizer prepared from PET waste Fertilizers and their methods. Background technique [0002] Fertilizer is one of the essential guaranteed resources of modern agriculture. The utilization rate of fertilizer is low, and the research and development of substitute products and new fertilizers are relatively backward, which directly leads to waste of resources and environmental pollution. According to the country's strategic deployment of "transforming the mode and adjusting the structure" of agricultural development, it aims to meet my country's current strategic needs of reducing the application of chemical fertilizers and pesticides and increasing efficiency. ...

Claims

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Application Information

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IPC IPC(8): C05G3/08C08F283/02C05G3/90
CPCC05G3/90C05G5/37C08F283/02C08F212/08C08F220/14
Inventor 李双来卢业敏乔艳胡诚陈云峰刘东海
Owner INST OF PLANT PROTECTION & SOIL FERTILIZER HUBEI ACAD OF AGRI SCI
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