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Preparation method of large-particle size melamine cyanurate

A technology of melamine cyanurate and a manufacturing method, which is applied in the field of manufacturing large particle size melamine cyanurate, can solve the problems of low heat resistance of additives, yellowing during high-temperature processing of nylon, affecting the quality of MCA, and the like. The effect of reducing dust phenomenon, simple production process and improving production environment

Active Publication Date: 2015-04-22
PRESAFER QINGYUAN PHOSPHOR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The use of water-soluble additives in the above patents will easily affect the quality of MCA, and the heat resistance of the additives is not high, which will easily lead to yellowing of nylon during high-temperature processing

Method used

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  • Preparation method of large-particle size melamine cyanurate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Put 5Kg of melamine and 5.115Kg of cyanuric acid into the kneader reactor, turn on the normal rotation and knead for 20 minutes, add 2 Kg of pure water, turn on the heating to 90°C and knead at a constant temperature for 2 hours, turn on the vacuum to dry the remaining water;

[0040] 2) Add 300g of caprolactam into a 2L flask, heat to 85°C, add 1.5g of sodium hydroxide after the dissolution is complete, turn on the vacuum to -0.05MPa for 5 minutes, then add 1.5g of hexamethylene diisocyanate, and stir well;

[0041] 3) Add the intermediate obtained in step 2) into the kneader, turn on the heating to 160°C while maintaining a vacuum of -0.05MPa, react for 1 hour and then cool to 80°C to discharge;

[0042] 4) Test bulk density: 0.7g / mL, particle size D50=10.2μm, TGA 1% thermal decomposition weight loss temperature of 305℃ in nitrogen atmosphere;

Embodiment 2

[0044] 1) Put 5Kg of melamine and 5.115kg of cyanuric acid into the kneader reaction kettle, turn on the normal rotation and knead for 20 minutes, add 2Kg of pure water, turn on the heating to 100°C and knead at a constant temperature for 2 hours, turn on the vacuum to dry the remaining water;

[0045] 2) Add 200g of caprolactam into a 2L flask, heat to 85°C, add 1 g of sodium hydroxide after the dissolution is complete, turn on the vacuum at -0.05MPa for 5 minutes, then add 1 g of N-acetyl caprolactam, and stir well;

[0046] 3) Add the intermediate obtained in step 2) into the kneader, turn on the heating to 170°C while maintaining a vacuum of -0.05MPa, react for 1 hour and then cool to 80°C to discharge;

[0047] 4) Test bulk density: 0.61g / mL particle size D50=9.3μm nitrogen atmosphere TGA 1% thermal decomposition weight loss temperature 303℃;

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Abstract

The invention discloses a preparation method of large-particle size melamine cyanurate. The preparation method comprises the following steps: (1) uniformly mixing melamine and cyanuric acid, adding water, heating, keeping temperature, and removing moisture; (2) carrying out prepolymerization reaction on caprolactam and a catalyst, then adding a cocatalyst, and uniformly mixing; and (3) adding a prepolymer obtained from the step (2) to a system obtained from the step (1) for polymerization reaction, after the polymerization reaction is finished, cooling, and discharging. MCA prepared through the method disclosed by the invention has large particle size, is coated with nylon 6 on a surface and can be used for improving the problem of poor compatibility of the MCA and a matrix when applied to plastic modification and nylon modification especially. The preparation method disclosed by the invention is green and environment-friendly. The MCA can reduce the phenomenon of dust reduction by being taken as a raw material of downstream plastic processing.

Description

technical field [0001] The present invention relates to a kind of preparation method of melamine cyanurate with large particle size. Background technique [0002] Melamine cyanurate (MCA) is a fine chemical developed in Japan in the 1980s. It is mainly used as a flame-retardant lubricant. The nitrogen content is as high as 49.4%, and the solubility in water is small. MCA has good thermal stability, 300 ° C It does not decompose below 400°C and begins to sublimate and decompose at the same time. MCA has the characteristics of flame retardancy, lubrication, and matting, and can be used in plastic flame retardancy, mechanical lubrication, paint matting, and cosmetics and printing and dyeing fields. In recent years, with the development of the global flame retardant market in the direction of non-halogenation, melamine cyanurate As a nitrogen-based flame retardant with high nitrogen content, high flame retardant efficiency, low toxicity and low smoke, it has been widely valued....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K5/3492C08G69/16C08G69/14C08L77/06
Inventor 陈敏聪唐海兰陈志钊周侃
Owner PRESAFER QINGYUAN PHOSPHOR CHEM
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