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Method for preparing microcapsule-coated ammonium polyphosphate through in-situ polymerization molecular self-assembly

A technology for coating ammonium polyphosphate and ammonium polyphosphate, which is applied in the field of materials, can solve the problems of reduced water solubility of ammonium polyphosphate, deteriorated heat transfer of the reaction kettle, and decreased stability, so as to reduce water solubility, facilitate industrial production, The effect of surface polarity reduction

Active Publication Date: 2016-05-11
山东青科华创化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the ammonium polyphosphate without microcapsule coating treatment, the water solubility of the coated ammonium polyphosphate is significantly reduced, and the thermal stability is improved. However, when the method disclosed in the above patent is used for microcapsule coating treatment, the reaction A large amount of ammonium polyphosphate and resin will appear on the inner wall of the kettle, which will deteriorate the heat transfer of the reactor
In addition, the particle size of ammonium polyphosphate coated microcapsules obtained by this method is obviously thicker, and even lumps are formed, which needs to be pulverized during use, resulting in the rupture of microcapsules and a decrease in stability.

Method used

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  • Method for preparing microcapsule-coated ammonium polyphosphate through in-situ polymerization molecular self-assembly
  • Method for preparing microcapsule-coated ammonium polyphosphate through in-situ polymerization molecular self-assembly
  • Method for preparing microcapsule-coated ammonium polyphosphate through in-situ polymerization molecular self-assembly

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Experimental program
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Effect test

Embodiment 1

[0033] In a 2L reaction kettle equipped with a stirrer, a thermometer, and a condensing reflux device, add 45g of melamine and 45g of formaldehyde (37wt% formaldehyde aqueous solution, the same below), adjust the pH to 8-9 with sodium bicarbonate, and raise the temperature to 70°C to react 0.5 -1h, after the reaction, cool down to 30°C, then add 180g ammonium polyphosphate and 540g deionized water, stir for 1-2h, then add 45g cyanuric acid, rise to 40°C, stir for 3-4h, filter and dry after reaction, Obtain 268g molecular self-assembled microcapsule-coated ammonium polyphosphate.

Embodiment 2

[0035] Add 36g melamine and 36g formaldehyde to a 2L reactor equipped with a stirrer, thermometer and condensing reflux device, adjust the pH to 8-9, raise the temperature to 70°C for 0.5-1h, cool down to 30°C after the reaction, and then add 180g Ammonium polyphosphate and 720g deionized water were stirred for 1-2 hours, then 36g of cyanuric acid was added, the temperature was raised to 60°C and the reaction was stirred for 3-4 hours. After the reaction, it was filtered and dried to obtain 248.6g of molecular self-assembled microcapsule-coated ammonium polyphosphate .

Embodiment 3

[0037]Add 30g melamine and 30g formaldehyde to a 2L reaction kettle equipped with a stirrer, a thermometer and a condensing reflux device, adjust the pH to 8-9, raise the temperature to 70°C for 0.5-1h, cool down to 30°C after the reaction, and then add 180g ammonium polyphosphate and 900g deionized water, stirred for 1-2 hours, then added 30g of cyanuric acid, heated to 60°C and stirred for 3-4 hours, filtered and dried after reaction to obtain 233.6g molecular self-assembled microcapsule-coated polyphosphoric acid Ammonium.

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Abstract

The invention discloses a method for preparing microcapsule-coated ammonium polyphosphate through in-situ polymerization molecular self-assembly. The method includes mixing formalin with melamine, increasing the temperature for condensation reaction after adjusting pH value of the mixture to 8-9, lowering the temperature after reaction, adding water and ammonium polyphosphate, stirring the mixture for 1-2 hours, adding cyanuric acid, increasing the temperature for in-situ polymerization reaction, coating the ammonium polyphosphate with a microcapsule, and performing filtering and drying after reaction to obtain the microcapsule-coated ammonium polyphosphate. The method has the advantages that the technological operation process is simple, ammonium polyphosphate coating rate is high, water solubility of the ammonium polyphosphate is reduced greatly, high dispersity and compatibility of the ammonium polyphosphate and polymer materials are achieved after coating, and flame retarding effect is remarkable; moreover, adhesion of the ammonium polyphosphate and resin to the inner wall of a reaction kettle is avoided during reaction, the reaction kettle is easy to clean, raw material utilization rate is increased and heat transfer efficiency of the reaction kettle is improved.

Description

technical field [0001] The invention relates to a microencapsulation coating method for ammonium polyphosphate, in particular to a method for preparing microcapsule-coated ammonium polyphosphate by in-situ polymerization molecular self-assembly technology, and belongs to the field of material technology. Background technique [0002] Intumescent halogen-free flame retardant has the advantages of flame retardancy, low smoke, low toxicity, and no corrosive gas release. It is the most promising halogen-free flame retardant. It is known as a revolution in flame retardant technology and has become a domestic research hotspots. As one of the main components of intumescent flame retardants, ammonium polyphosphate is widely used due to its high phosphorus content, large nitrogen content, good thermal stability, cheap price, low toxicity, and relatively safe use. Used as flame retardant for coatings, plastics, fibers, rubber, etc. However, due to its own chemical structure, ammon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K3/32C08G12/32
CPCC08G12/32C08K3/32C08K9/10C08K2003/323
Inventor 邢文国岳涛陈琦冯维春周倜张健孟宪兴李培培游淇杨旭
Owner 山东青科华创化工科技有限公司
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