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Aqueous polymer coating agent and coated controlled release fertilizer

A water-based polymer and coating agent technology, applied in the field of materials and fertilizers, can solve the problems of low solid content, dissolve soluble fertilizers, reduce nutrient release, etc., and achieve the effects of low viscosity, high solid content and environmental friendliness

Active Publication Date: 2011-05-11
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the problems of high viscosity, low solid content, slow water volatilization and dissolution of soluble fertilizers in the coating process of water-based polymer coating agents, this type of coating agent is far from meeting the needs of actual production.
CN 1388169 and CN 1546543 disclose the method of preparing water-based polymer fertilizer coating agent as main raw material with waste plastics and other polymer materials, although the method partly overcomes the shortcoming of organic solvent type polymer fertilizer coating agent, but due to the The method must first use some organic solvents to dissolve polymer materials such as waste plastics, and then use high-speed shear emulsification technology to prepare water-based polymer coating agents, so the harm of organic solvents has not been completely eliminated; in addition, due to the main film-forming The substance is already a polymer material, and its composition and structure are difficult to change, thus greatly reducing the possibility of adjusting the release of nutrients from controlled-release fertilizers by adjusting the composition and structure of the polymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of water-based polymer composite coating agent

[0033] Using the polymerization process (A), 900 grams of water, 13 grams of sodium lauryl sulfate, 6 grams of n- Octanol and 8 g ammonium bicarbonate, stir to dissolve. Dissolve 8 grams of ammonium persulfate in 100 grams of water for use. Put 510 grams of styrene, 470 grams of butyl acrylate and 20 grams of acrylic acid into the dropping funnel and mix evenly, then add 20% of the mixed monomers into the reaction bottle, start stirring and heat up to about 60 °C, then add 60 Milliliters of ammonium persulfate aqueous solution, and at the same time drop the remaining mixed monomers from the dropping funnel at a constant speed. The monomer dropping rate was controlled and the reaction temperature was controlled at about 85°C, and the monomer dropping time was 2 hours. After dropping, the remaining 40 ml of ammonium persulfate aqueous solution was added and reacted at the reaction temperature for 4 hours....

Embodiment 2

[0037] (1) Preparation of water-based polymer composite coating agent

[0038] The polymerization equipment and polymerization process steps are the same as in Example 1, except that 300 grams of styrene, 150 grams of methyl methacrylate, 490 grams of butyl acrylate, 60 grams of acrylic acid, 10 grams of sodium lauryl sulfate, and octyl 12 grams of phenol polyoxyethylene ether, 5 grams of n-octanol, 12 grams of ammonium persulfate, 12 grams of ammonium bicarbonate, and 1000 grams of water. The monomer conversion rate of the polymerization reaction is 98.9%, the product viscosity is 58mPa.S, the particle size is 62nm, and the glass transition temperature of the polymer is 25.1°C.

[0039] (2) Fertilizer coating process

[0040] 10kg particle size is the compound fertilizer of 2~4 millimeters (from Shandong Kingenta Ecological Engineering Co., Ltd., with N-P 2 o 5 -K 2 (2% by weight: 16-16-16) into the fluidized fluidized bed, preheated to 50-60°C, and then spray the 1.8kg o...

Embodiment 3

[0042] (1) Preparation of water-based polymer composite coating agent

[0043] Using the polymerization process (B), add 900 grams of water, 15 grams of sodium dodecylbenzenesulfonate, 12 Grams of octylphenol polyoxyethylene ether, 5 grams of n-octanol and 15 grams of ammonium bicarbonate, stirred to dissolve. Dissolve 10 grams of ammonium persulfate in 100 grams of water for use. Put 80 grams of methyl methacrylate, 100 grams of butyl acrylate and 30 grams of methacrylic acid into a reaction flask, add 50 milliliters of ammonium persulfate aqueous solution when the temperature rises to 60 ° C, and react at about 80 ° C for 1.5 hours. Then from the dropping funnel, a mixed solution composed of 340 grams of styrene and 450 grams of butyl acrylate was added dropwise at a constant speed, and the dropping time was 1.5 hours. Then the remaining 50 ml of ammonium persulfate aqueous solution was added, and the temperature was raised to about 85° C. to continue the reaction for 3.5 ...

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Abstract

The invention relates to an aqueous polymer coating agent, a coating controlled release fertilizer containing the coating agent and a preparation method thereof. The coating agent is prepared from hard monomer, soft monomer and the functional monomer of an unsaturated acid capable of free radical polymerization in the presence of an initiating agent, an emulsifying agent and an optional auxiliaryemulsifying agent, wherein the weight ratio of the hard monomer to the soft monomer is between 2 to 1 and 1 to 2; and the functional monomer accounts for 0.2 to 15 weight percent of the total weight of the monomers.

Description

technical field [0001] The invention relates to a water-based polymer coating agent, a coated controlled-release fertilizer containing the coating agent and a preparation method thereof, belonging to the technical field of materials and fertilizers. Background technique [0002] Improving fertilizer utilization and reducing the amount of fertilizer is an important method to reduce production costs in agriculture, forestry, animal husbandry, horticulture, flowers, lawns and other fields, and is also an important means to protect the ecological environment. Therefore, controlled and slow-release fertilizers are getting more and more attention in the fertilizer industry. At present, there are many types of commercialized controlled-release fertilizers, among which coated controlled-release fertilizers are the mainstream and main development direction. [0003] The controlled-release fertilizer can be divided into two categories by the type of coating material: one class is the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C08F212/08C08F220/10C08F2/24
CPCC08F212/08C08F220/06C05G5/37C08F220/1802C08F220/1804C08F220/1811C08F220/1818
Inventor 万连步于兵陈宏坤杨力
Owner KINGENTA ECOLOGICAL ENG GRP
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