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Urea-coated composite emulsion and preparation method and application thereof

A technology of urea coating and compound emulsion, applied in application, fertilizer mixture, fertilization device, etc., can solve the problem of polymer coating controlled release fertilizer with short nutrient release period, cold brittleness and hot stickiness, and unsatisfactory water resistance and structural stability And other issues

Inactive Publication Date: 2013-03-13
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the nature of the polymer emulsion synthesis monomer itself determines that some commonly used polymer emulsions have problems such as cold and brittle hot stickiness, water resistance and structural stability after being directly used as coating agents, which lead to the control of such polymer coatings. The nutrient release period of the release fertilizer is not long

Method used

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  • Urea-coated composite emulsion and preparation method and application thereof
  • Urea-coated composite emulsion and preparation method and application thereof
  • Urea-coated composite emulsion and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0078] Embodiment 1: Preparation of urea-coated composite emulsion of the present invention

[0079] The implementation steps of this embodiment are as follows:

[0080] First put 14 parts by weight of deionized water into the container, and adjust its pH value to 7.8 with concentrated ammonia water; Under the condition of 480rpm, 50 parts by weight of styrene-acrylic emulsion sold by Rohm and Haas under the trade name AS-2010 were sequentially added, with a solid content of 49% by weight and a glass transition temperature of 21°C; Fatty alcohol polyoxyethylene ether sodium sulfate; 15 parts by weight of the aqueous polyurethane emulsion sold by Bayer under the trade name Dispercoll U54, its solid content is 50% by weight, viscosity 40-400mPa.s, activation temperature 45-55 ℃; Stirring for 8 minutes under the condition of 15000 rpm, thus obtaining the urea-coated composite emulsion.

Embodiment 2

[0081] Embodiment 2: Preparation of urea-coated composite emulsion of the present invention

[0082] The implementation steps of this embodiment are as follows:

[0083] Carry out according to the same embodiment as Example 1, just put 24 parts by weight deionized water in the container at first, adjust its pH value to 8.2 with concentrated ammonia water; Under the condition of 520rpm, add 70 parts by weight of the described styrene-acrylic emulsion sequentially respectively; 1.2 parts by weight of the described alkyl polyoxyethylene ether; 25 parts by weight of the described water-based polyurethane emulsion; then stir for 10min under the condition of rotating speed 20000rpm , so as to obtain the described urea-coated composite emulsion.

Embodiment 3

[0084] Embodiment 3: Preparation of urea-coated composite emulsion of the present invention

[0085] The implementation steps of this embodiment are as follows:

[0086] Carry out according to the same embodiment as Example 1, just put 18 parts by weight of deionized water into the container at first, adjust its pH value to 8.0 with concentrated ammonia water; Under the condition of 500rpm, add the styrene-acrylic emulsion described in 56 parts by weight sequentially respectively; The fatty alcohol polyoxyethylene ether sodium sulfate described in 0.9 parts by weight; The water-based polyurethane emulsion described in 18 parts by weight; Under the condition of stirring for 8-10910min, the urea-coated composite emulsion is obtained.

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Abstract

The invention relates to urea-coated composite emulsion and a preparation method and application thereof. The urea-coated composite emulsion consists of waterborne polyurethane emulsion, styrene-acrylic emulsion, nonionic surfactant and the like, or consists of waterborne polyurethane emulsion, styrene-acrylic emulsion, nonionic surfactant, organic silicon emulsion and the like. The urea-coated composite emulsion provided by the invention delays quick release of fertilizer, obviously increases the release time, and can be matched with the nutrient intake of plants particularly by ternary blending. The coated composite emulsion provided by the invention can be used for coating any water-soluble fertilizer and has very broad application prospect.

Description

【Technical field】 [0001] The invention belongs to the technical field of chemical fertilizers. More specifically, the present invention relates to a urea-coated composite emulsion, a method for preparing the urea-coated composite emulsion, and an application of the urea-coated composite emulsion. 【Background technique】 [0002] Coated controlled-release chemical fertilizers can effectively control the release rate of nutrients, meet the needs of plants for absorption, and increase nutrient utilization by more than 20%. It is an important technical means to solve the problem of efficient and clean use of chemical fertilizers in agriculture. At present, the coating materials mainly include polyolefin, polyurethane and polymer emulsion. The coated controlled-release fertilizer prepared by polymer emulsion has an "S"-shaped release curve, which matches well with the absorption of plant nutrients, and the emulsion uses water as the dispersion medium, which is a clean controlled-...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G3/90
Inventor 杨相东赵秉强李燕婷李娟袁亮林治安
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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