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 resi

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
Comparison scheme
Effect test

Example Embodiment

[0078] Embodiment 1: the 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, sequentially add 50 parts by weight of the styrene-acrylic emulsion sold by Rohm and Haas with the trade name AS-2010, its solid content is 49% by weight, the glass transition temperature is 21 ℃; Fatty alcohol polyoxyethylene ether sodium sulfate; 15 parts by weight of an aqueous polyurethane emulsion sold by Bayer under the trade name Dispercoll U54, with a solid content of 50% by weight, a viscosity of 40-400mPa.s, and an activation temperature of 45-55°C; Under the condition of 15000rpm, the mixture was stirred for 8min, thus obtaining the urea-coated composite emulsion.

Example Embodiment

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

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

[0083] Carry out the same implementation as in Example 1, but first put 24 parts by weight of deionized water into the container, and adjust its pH value to 8.2 with concentrated ammonia water; 70 parts by weight of the described styrene-acrylic emulsion; 1.2 parts by weight of the described alkyl polyoxyethylene ether; 25 parts by weight of the described water-based polyurethane emulsion were sequentially added under the condition of 520 rpm; then stirred for 10 min under the condition of a rotating speed of 20000 rpm , thus obtaining the urea-coated composite emulsion.

Example Embodiment

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

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

[0086] Carry out the same implementation as in Example 1, but first put 18 parts by weight of deionized water into the container, and adjust its pH value to 8.0 with concentrated ammonia water; Under the condition of 500rpm, sequentially add 56 parts by weight of the described styrene-acrylic emulsion; 0.9 parts by weight of the described fatty alcohol polyoxyethylene ether sodium sulfate; 18 parts by weight of the described water-based polyurethane emulsion; The mixture was stirred for 8 to 10910 min under the conditions to obtain the urea-coated composite emulsion.

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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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