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Industrial preparation method of water-soluble resin coating material and application thereof

A water-soluble resin, coating material technology, applied in the application, agriculture, fertilizer form and other directions, can solve the problems of unfavorable high efficiency, energy saving, cost-saving industrial production, low Tg temperature, loss of controlled release performance, etc., and achieve obvious success. The film is flexible, the manufacturing cost is reduced, and the effect of less coating consumables

Active Publication Date: 2011-11-16
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Chinese patent CN1939878A and related U.S. patents report that the above-mentioned commercial emulsion is used for coating, but the fertilizer surface must be pretreated before coating, and the pretreatment of the fertilizer surface will undoubtedly increase the complexity of the process, which is not conducive to achieving high efficiency, energy saving, and energy saving. industrialized production
Chinese patent CN101182269A aims at the problem of the above-mentioned fertilizer surface pretreatment, the emulsion is improved from the relationship between the polymerization method and conditions, the composition, performance, polymer structure and membrane material performance of the emulsion, but, with regard to the water-based polymer The synthesis process, monomer ratio, emulsifier selection and polymerization process all need to be improved
To sum up, there are still some fatal technical bottlenecks in the prior art: (1) the water whitening resistance (water resistance) of the existing commercial emulsion film formation is very poor, and the film formation will completely absorb water and swell in a few hours in water, losing its Controlled release performance; its Tg temperature is low, it is easy to agglomerate in the fluidized bed, and the fertilizer will stick together during the storage of the finished product; (2) In the coating process, commercial emulsions cannot meet the high temperature and non-stick requirements of the coating process at the same time. (3) Most of the current patented processes and methods are laboratory-scale processes, technologies and methods, which are difficult to be directly applied to the industrial production of controlled-release fertilizers; (4) still need to be processed before water-based polymer coating Fertilizer surface for pretreatment
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  • Industrial preparation method of water-soluble resin coating material and application thereof
  • Industrial preparation method of water-soluble resin coating material and application thereof
  • Industrial preparation method of water-soluble resin coating material and application thereof

Examples

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Embodiment 1

[0045] The batching of embodiment 1 emulsion is with reference to the proportioning of following material:

[0046] Water: 600-650 parts by weight;

[0047] Emulsifier: 15-30 parts by weight;

[0048] Mixed monomers: 500-550 parts by weight;

[0049] Initiator: 2.5-3.5 parts by weight.

[0050] This embodiment provides Table 1 as a calculation example:

[0051] Table 1

[0052]

[0053] The monomers DT1, DT2, DT11, DT3-1, DT3-2, DT5 are ethyl acrylate, butyl acrylate, isoamyl acrylate, n-octyl acrylate, isooctyl acrylate, isooctyl methacrylate, methyl Lauryl acrylate, methyl acrylate, methyl methacrylate, acrylic acid, styrene, acrylic acid, acrylonitrile, methacrylic acid, acrylamide, N-methylol acrylamide, hydroxyethyl acrylate, hydroxypropyl acrylate Any one of ester, glycidyl acrylate, glycidyl methacrylate, ethylene glycol dimethacrylate, ethylene glycol dimethacrylate, divinylbenzene, maleic acid or maleic anhydride Or a mixture of two or more; the emulsifier i...

Embodiment 2

[0054] Embodiment 2 The preparation of a kind of propylene emulsion and the preparation of coated controlled-release fertilizer

[0055] (1) The industrial method synthesis process and steps of propylene water-based polymer (propylene water-soluble resin):

[0056] (1) Add 1015kg of pure water, 10kg of sodium dodecylsulfonate, 5kg of OP-10, 1.5kg of N-methylolacrylamide in the first 2-ton reactor, and stir to obtain an emulsifier solution;

[0057] (2) Take out 60kg emulsifier solution and place it in the second 2 ton reactor;

[0058] Add the mixture of 482kg methyl acrylate, 172kg butyl acrylate, 23kg methacrylic acid and 77kg isooctyl acrylate to the remaining emulsifier solution in the first reactor under stirring, and stir to obtain emulsified monomers;

[0059] The monomer of the emulsion polymer is acrylate and its emulsion, which is obtained by conventional batch emulsion polymerization process, semi-continuous emulsion polymerization process, continuous emulsion poly...

Embodiment 4

[0101] Embodiment 4 manufactures coating controlled-release potassium fertilizer with propylene emulsion and styrene-acrylic emulsion

[0102] (1) The industrial synthesis method and steps of propylene and styrene-acrylic water-based polymer are the same as embodiment 1 and embodiment 2.

[0103] (2) Manufacture of controlled release potassium fertilizer

[0104] 800kg of extruded and granulated potassium chloride or potassium sulfate particles with a particle size of 2 to 5mm are self-absorbed and bottom-sprayed into a pneumatic fluidized bed, the fan and heat exchanger are turned on, and the potash fertilizer is heated to 80°C; under the atomization pressure of 0.2-0.3K Pa, atomize and spray the water-soluble resin at a feed rate of 0.5kg per minute for 5 minutes; after that, spray the water-soluble resin at a feed rate of 1.5-2kg per minute at the same atomization pressure Spray the coating material under pressure until the coating material is sprayed. Coating material (d...

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Abstract

The invention discloses a preparation method of a water-soluble resin coating material and an application thereof. The preparation method comprises the steps as follows: water and emulsifier are prepared into an emulsifier solution; part of the emulsifier solution and a mixed monomer are prepared into an emulsive monomer; and the rest of the emulsifier solution and the emulsive monomer react under the evocation of an evocating agent to obtain the coating material. The invention realizes a high-temperature coating process of water polymer and adopts industrial-scale equipment and process condition so as to be conveniently used for the manufacture of the controlled-release coating material of an enterprise without pilot test and technique magnification. The Tg temperature of the coating material is 15-100 DEG C, and agglomeration can not occur when the fluidization coating temperature reaches 100 DDG C.

Description

technical field [0001] The invention belongs to the technical field of preparation of agricultural controlled-release fertilizers, and in particular relates to an industrial preparation method and application of a water-soluble resin coating material. Background technique [0002] Under the guidance of the national policy of high efficiency, energy saving and environmental protection, the focus of energy saving and environmental protection in my country's agricultural production is how to effectively increase the utilization rate of chemical fertilizers and reduce the amount of chemical fertilizers used. According to the latest research reports, as an important means of agricultural production, chemical fertilizers account for 40-50% of my country's agricultural production investment. However, the seasonal utilization rate of chemical nitrogen fertilizers in field crops has been hovering at 30-35%, or even lower. The low utilization rate of chemical fertilizers not only caus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/24C08F220/18C08F220/14C08F220/06C08F212/08C05G3/00C05G3/08C05G5/00C05G3/90
Inventor 樊小林廖照源孙运生孙钦国奕林郑祥洲
Owner SOUTH CHINA AGRI UNIV