Controlled fertilizer of polymer capsule, production method, and dedicated capsule material

A technology of coating material and controlled-release fertilizer, applied in fertilizer form, fertilizer mixture, application and other directions, can solve the problems of disordered preparation materials and solvent toxicity of coated controlled-release fertilizer, and achieve safe, non-toxic and non-irritating odor in processing technology. , the effect of improving safety

Inactive Publication Date: 2009-11-11
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of messy preparation materials for the above-mentioned coated controlled-release fertilizers and the toxicity of solvents used in the preparation, the present invention provides a polymer-coated controlled-release fertilizer and its production method and special coating materials

Method used

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  • Controlled fertilizer of polymer capsule, production method, and dedicated capsule material
  • Controlled fertilizer of polymer capsule, production method, and dedicated capsule material
  • Controlled fertilizer of polymer capsule, production method, and dedicated capsule material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, the screening of the material of producing coated fertilizer and solvent

[0032] The relatively cheap polyethylene is used as the main coating material. First, the film-forming performance and controlled-release performance are regulated by selecting low-density polyethylene with different average molecular weight and molecular secondary structure. Research the controlled-release performance of the coating material system combined with low-density polyethylene and linear low-density polyethylene, and develop a new coating material formula. Second, according to the principle of "like dissolves like" of polymers, with reference to the solubility parameters of polyolefin (polyethylene), select solvents with similar solubility values ​​and low toxicity (organic chemical volumes compiled with reference to hazardous chemicals standards) for experiments. Screen solvents with excellent solubility and low toxicity, and find solvents that can dissolve polyethylene ...

Embodiment 2

[0047] Example 2, Controlled Release Performance Experiment of Coated Fertilizer Prepared by Coating System Obtained by Dissolving Polyethylene in Decalin, n-Octane and Cyclohexane

[0048] The processing device and process flow chart of coated fertilizer are as follows: figure 1 Shown: Among them, figure 1 Among them, 1 is the Roots blower (model WL20~5 / 0.20), 2 is the buffer tank, 3 is the flow meter (model LZB-100), 4 is the electric heater, 5 is the fluidized bed, 6 is the shell and tube condenser, 7 and 8 are air coolers; 9 is a sight cup; 10 is a solvent receiver, 11 is a solvent bucket, 12 is an oil pump (model is BRY), 13 is an oil storage tank, 14 and 15 are reaction kettles, and 16 is a two-fluid nozzle , 17 is an air compressor (model: V-0.14 / 10C), 18 is an automatic feeder, and 19 is a feed hopper.

[0049] use as figure 1 The processing device shown, the technological process step that adopts is:

[0050] Step 1: Add coating materials such as organic solvents ...

Embodiment 3

[0071] Embodiment 3, the impact of different linear polyethylene ratios on the nutrient release performance of coated fertilizers

[0072] According to the preparation method of the coated fertilizer described in Example 2, two different linear types of branched low-density polyethylene (LDPE, brand 1F7B) and linear low-density polyethylene (LLDPE, brand: DFDA-7042) are used. The polyethylene material (set 4 ratios, as shown in table 3), use cyclohexane as solvent, obtain corresponding 4 processing schemes (shown in table 3 1,2,3 and 4), each handles three repeat. See Table 3 for the specific ratio configuration and usage of other materials. The coated controlled-release fertilizer was prepared with different ratios of polyethylene.

[0073] Four kinds of coated controlled-release fertilizers prepared above were tested for release performance according to the method for evaluating the performance of coated fertilizers described in Example 2 respectively. The release performan...

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Abstract

The invention discloses a polymer-coated controlled-release fertilizer, a production method and a special coating material. The coating material of the controlled-release fertilizer comprises branched low-density polyethylene with an average molecular weight between 20,000-30,000 Daltons and linear low-density polyethylene with an average molecular weight between 20,000-30,000 Daltons; The mass fraction ratio of the branched low-density polyethylene and the linear low-density polyethylene is 1:0.33-1. The polymer-coated controlled-release fertilizer is composed of a water-soluble fertilizer and the coating material in claims 1-4; the coating material is coated on the water-soluble fertilizer. The coated fertilizer of the invention has good controlled-release performance, safe and non-toxic processing technology, and can be used for economic crops such as lawns, flowers and vegetables.

Description

technical field [0001] The invention relates to a polymer-coated controlled-release fertilizer, a production method thereof and a special coating material. Background technique [0002] After the granular fertilizer is coated with a polymer, the nutrients of the fertilizer can be effectively controlled and released. Compared with the inorganic material-coated fertilizer and the chemically synthesized slow-release fertilizer, the controlled-release performance is obvious. In the processing technology of polymer-coated fertilizers, a widely used scheme is: dissolving the polymer and its additives in a certain solvent, and then adopting the spray precipitation phase inversion method to form a film. In this processing scheme, the polymer itself The film-forming performance of the polymer and the solubility of the polymer in the solvent are the first factors to be considered. According to the solubility value of the polymer and the solvent, several available polymer solution syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G5/00B01J2/16C08F110/02
Inventor 曹一平杨相东江荣风张福锁胡树文
Owner CHINA AGRI UNIV
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