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Water-based polyacrylate film-coated controlled release fertilizer based on water-dispersion nano-SiO2 modification and preparation method of water-based polyacrylate film-coated controlled release fertilizer

A technology of polyacrylate and polyacrylate emulsion, which is applied in the direction of layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc., can solve problems such as patents and literature materials that have not been reported, and achieve environmental friendliness and good controlled release effect Effect

Active Publication Date: 2017-07-07
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

However, water-dispersed SiO 2 The data of the modified water-based polyacrylate emulsion has not been reported, and the water-dispersed nano-SiO 2 Modified water-based polyacrylate is also not reported in the patent and literature of coating fertilizer

Method used

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  • Water-based polyacrylate film-coated controlled release fertilizer based on water-dispersion nano-SiO2 modification and preparation method of water-based polyacrylate film-coated controlled release fertilizer
  • Water-based polyacrylate film-coated controlled release fertilizer based on water-dispersion nano-SiO2 modification and preparation method of water-based polyacrylate film-coated controlled release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, based on water-based polyacrylate coated controlled-release fertilizer:

[0037] a. Preparation of water-based polyacrylate emulsion: first place 4.12 g of sodium dodecylbenzenesulfonate, 8.24 g of OP-10 emulsifier and 250ml of deionized water in a 1L round bottom three-necked bottle, and stir to form a uniform water box. Furthermore, 110 g of butyl acrylate, 90 g of methyl methacrylate, and 5 g of methacrylic acid were mixed to form an oil phase. The oil phase was added into the water phase and stirred continuously for 30 min to form a pre-emulsion. Pour out 75% of the pre-emulsion from the three-necked bottle, turn on the electric heating mantle, and wait for the reaction temperature to rise to 85°C, then add the initiator solution (50ml, 0.013 g / mL K 2 S 2 o 8 ) and the pre-emulsion poured from the three-necked bottle were divided into four parts and added to the reaction system alternately, and the stirring rate was maintained at 200rpm throughout ...

Embodiment 2

[0045] Embodiment 2, based on water dispersion nano-SiO 2 Modified water-based polyacrylate coated fertilizer:

[0046] a. Preparation of water-based polyacrylate emulsion: first place 4.12 g of sodium dodecylbenzenesulfonate, 8.24 g of OP-10 emulsifier and 250ml of deionized water in a 1L round bottom three-necked bottle, and stir to form a uniform water box. Furthermore, 110 g of butyl acrylate, 90 g of methyl methacrylate, and 5 g of methacrylic acid were mixed to form an oil phase. The oil phase was added into the water phase and stirred continuously for 30 min to form a pre-emulsion. Pour out 75% of the pre-emulsion from the three-necked bottle, turn on the electric heating mantle, and wait for the reaction temperature to rise to 85°C, then add the initiator solution (50ml, 0.013 g / mL K 2 S 2 o 8 ) and the pre-emulsion poured from the three-necked bottle were divided into four parts and added to the reaction system alternately, and the stirring rate was maintained at...

Embodiment 3

[0050] Embodiment 3, based on water dispersion nano-SiO 2 Modified water-based polyacrylate coated fertilizer:

[0051] a. Preparation of water-based polyacrylate emulsion: The preparation process and formula of water-based polyacrylate emulsion are the same as in Example 1.

[0052] b. Preparation of coating solution: the solid content of the water-based polyacrylate emulsion prepared in step a is about 40.7%, and the water-based polyacrylate emulsion whose dry matter accounts for 10% of the weight of the fertilizer core particles is used as a material to make a coated fertilizer. Weigh 98.28g of water-based polyacrylate emulsion mother liquor, and then weigh 1.5% of water-based polyacrylate water-dispersed nano-SiO 2 Dispersion (30%) 1.98 g was added to the water-based polyacrylate emulsion, and finally 100 mL of deionized water was added and stirred for 5 minutes to obtain a coating solution.

[0053] c. Preparation of coated fertilizer: use a small fluidized bed coating ...

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Abstract

The invention relates to a water-based polyacrylate film-coated controlled release fertilizer based on water-dispersion nano-SiO2 modification. The film-coated controlled release fertilizer comprises fertilizer core particles and a high-polymer coating film outside the fertilizer core particles. The film-coated controlled release fertilizer is characterized in that the high-polymer coating film is a water-dispersion nano-SiO2 modified water-based polyacrylate emulsion; the mass of the water-dispersion nano-SiO2 modified water-based polyacrylate emulsion is 0.1%-2.5% of that of water-based polyacrylate dry matters; and the mass of the water-based polyacrylate dry matters is 5%-15% of that of the fertilizer core particles. A preparation technical process comprises the three parts of preparing the water-based polyacrylate emulsion, preparing a coating solution, and preparing the film-coated fertilizer. By utilizing 0.5% of the water-dispersion nano-SiO2 modified water-based polyacrylate emulsion, the mechanical strength of a polymer and the adhesive forces of the coating film and the fertilizer are increased; and film-coated urea prepared from the compound emulsion is environment-friendly and has an excellent controlled release effect, the dissolution rate in a preliminary stage is 3.6%, and the accumulated release rate in 7 days is 11.3%.

Description

technical field [0001] The invention belongs to the field of fertilizer manufacturing technology, in particular to a water-dispersed nano-SiO 2 Modified water-based polyacrylate coated fertilizer, and this water-dispersed nano-SiO 2 The preparation method of the modified water-based polyacrylate coated fertilizer. Background technique [0002] In the 20th century, 1 / 2 of the grain yield per unit area and 1 / 3 of the total grain output came from the contribution of chemical fertilizers. China accounts for 10% of the world's arable land and consumes 1 / 3 of the world's fertilizers, and the amount of fertilizer applied per unit area is three times the world's average amount of fertilizer [1] . The low utilization rate of fertilizers has not only caused huge economic and energy pressure, but also caused a series of environmental problems [2] . All countries in the world are developing slow / controlled release fertilizers that can improve the efficient use of nutrients, among w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05G5/30
Inventor 杜昌文申亚珍周健民
Owner INST OF SOIL SCI CHINESE ACAD OF SCI