Water-based polymer coated controlled release fertilizer and method for preparing same

A technology of water-based polymers and controlled-release fertilizers, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of high manufacturing costs for large-scale applications, polymers are difficult to degrade, and secondary pollution, etc., to achieve controlled fertilizer nutrient release , Good controlled release effect, environment-friendly effect

Active Publication Date: 2010-11-03
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this type of fertilizer is that it has a good controlled release effect, but this type of polymer itself is difficult to degrade, and most of the organic solvents are used in the production process, which may cause second...

Method used

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  • Water-based polymer coated controlled release fertilizer and method for preparing same
  • Water-based polymer coated controlled release fertilizer and method for preparing same
  • Water-based polymer coated controlled release fertilizer and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0074] 1. Preparation of coating liquid - firstly, the selected coating liquid monomer and emulsifier are fully stirred and emulsified in water to make a coating mother liquid. The coating mother liquid should be stored at a temperature of 10°C to 25°C, and the storage time should not be longer than 30 days; then the coating mother liquid, water and the selected cross-linking agent should be mixed to prepare a coating liquid, which is ready for immediate use.

[0075] 2. Fertilizer granulation - general chemical fertilizers, such as nitrogen fertilizers (ammonium bicarbonate, ammonium sulfate, ammonium chloride, ammonium nitrate, ammonium sulfur nitrate, sodium nitrate, calcium nitrate, calcium ammonium nitrate, urea, etc.), Calcium phosphate, double superphosphate, calcium magnesium phosphate fertilizer, etc.), potassium fertilizer (potassium sulfate, potassium chloride, etc.), multi-component fertilizer (ammoniated calcium superphosphate, nitrate phosphate fertilizer, ammoniu...

Embodiment 1

[0083] 1 Catalyst preparation

[0084] Measure 40 mL of deionized water into a 100 mL beaker, and add 3 g of ammonium persulfate thereto at room temperature. After being stirred by an electric mixer for 10 min, the catalyst was divided into two parts: 30% (about 12 g) of it was measured as the initiator; the remaining 70% was used for the preparation of the pre-emulsifier.

[0085] 2 mixed monomer preparation

[0086] The amount of each monomer used is as follows:

[0087] Monomer Name Consumption (g)

[0088] Unsaturated silicone monomer: Vinyltrimethoxysiloxane 12

[0089] Hard Monomer: Methyl Methacrylate 200

[0090] Soft Monomer: Butyl Acrylate 250

[0091] Functional Monomer: Acrylic 8

[0092] Methacrylic acid 3

[0093] Acrylamide 8

[0094] 3 Preparation of pre-emulsion

[0095] Measure 150 mL of deionized water and add 5 g of emulsifier to it. After being emulsified for 30 minutes, 70% of mixed monomers (about 337g) and 70% of catalyst (about 30.1g) were ad...

Embodiment 2

[0102] Increase the amount of methyl methacrylate in the mixed monomer to 210g; reduce the amount of butyl acrylate to 240g. Other operations for preparing the coating solution are the same as in Example 1. When preparing the coating solution, add 1% of the cross-linking agent based on the dry weight of the emulsion. The fluidized bed coating parameters are the same as in Example 1.

[0103] The controlled release time in water at 40°C is 10 days, and the release pattern is similar figure 1 The cumulative dissolution profile of fertilizer sample 2 is shown.

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Abstract

The invention relates to water-based polymer coated controlled release fertilizer and a method for preparing the same. The water-based polymer coated controlled release fertilizer comprises core fertilizer granules and high polymer films. The raw materials of the high polymer films comprise 150-250 parts by weight of hard monomer (methyl methacrylate), 150-250 parts by weight of soft monomer (butyl acrylate), 15-30 parts by weight of functional monomers (methacrylic acid, acrylic acid and acrylamide), 10-15 parts by weight of unsaturated organic silicon monomer, 1-3 parts by weight of emulsifier, 0.1-0.3 part by weight of cross-linking agent and 0.3-0.5 part by weight of catalyst, wherein the hard monomer, the soft monomer and functional monomers form the acrylic acid monomer. The weight ratio of the core fertilizer granules to the dry matter of high polymer emulsification is 8-12:1. The method for preparing the water-based polymer coated controlled release fertilizer comprises the steps of preparing coating mother solution, preparing coating solution, granulating the fertilizer and coating the fertilizer granules with a fluidized bed. The water-based polymer coated controlled release fertilizer has good controlled release effect and low cost and is environmental friendly. The release of the nutrients in the water-based polymer coated controlled release fertilizer can be controlled effectively and as slow as possible according to the grow need of the crop.

Description

technical field [0001] The invention relates to a fertilizer manufacturing technology, in particular to a water-based polymer-coated controlled-release fertilizer based on water-based reaction film-forming technology, and a preparation method of the water-based polymer-coated controlled-release fertilizer. Background technique [0002] Due to factors such as the continuous growth of the global population, the increasing demand for food, and the gradual reduction of arable land, modern agricultural production has greatly increased its dependence on chemical fertilizers. But the utilization rate of fertilizer is far from satisfactory, especially in our country this phenomenon is more serious. At present, in the seasonal utilization rate of chemical fertilizers in my country, nitrogen is about 30-35%, phosphorus is about 10-25%, and potassium is about 35-50%. This not only caused a huge waste of resources, but also caused many environmental problems such as the greenhouse effe...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 杜昌文赵聪周健民刘军宋圣吉
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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