Preparation method of trimeric cyanamide cyanurate flame retardant

A technology of melamine cyanurate and melamine, which is applied in the field of preparation of melamine cyanurate flame retardants, can solve the problems of high consumption, increase of production cost and workload, and reduction of matrix mechanical properties, and achieve low toxicity and improved The effect of equipment utilization and low price

Inactive Publication Date: 2012-10-17
张士钊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process needs to consume a lot of water, and most of the products need subsequent purification, which increases the production cost and workload
In addition, the commercially available MCA crystal forms are mostly random granules or flakes, adding flame retardant to plastics will reduce the mechanical properties of the matrix to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Add 110 parts by weight of water as a solvent in the reaction vessel, then add 5 parts by weight of urea and 12 parts by weight of melamine in sequence, stir evenly and heat up to 70°C, add 12 parts by weight of cyanuric acid, stir and heat up to 95 Start keeping warm at ℃, adjust the pH value of the system to 9.5, and continue stirring for 55 minutes;

[0018] (2) After the obtained reaction product is separated by a centrifuge, the filtrate is recovered, and the solid product is dried at 110° C. and crushed to 3.0 μm to obtain a melamine cyanurate flame retardant.

[0019] The melamine and cyanuric acid are both industrial grade, wherein the mass percentage of melamine is 98%-99.8%, and the mass percentage of cyanuric acid is 97%-98.5%.

Embodiment 2

[0021] (1) Add 100 parts by weight of water as a solvent in the reaction vessel, then add 4 parts by weight of urea and 10 parts by weight of melamine in sequence, stir evenly and heat up to 65°C, add 10 parts by weight of cyanuric acid, stir and heat up to 95°C Start keeping warm at ℃, adjust the pH value of the system to 9.0, and continue stirring for 60 minutes;

[0022] (2) After the obtained reaction product is separated by a centrifuge, the filtrate is recovered, and the solid product is dried at 100° C. and crushed to 2.0 μm to obtain a melamine cyanurate flame retardant.

[0023] The melamine and cyanuric acid are both industrial grade, wherein the mass percentage of melamine is 98%-99.8%, and the mass percentage of cyanuric acid is 97%-98.5%.

Embodiment 3

[0025] (1) Add 120 parts by weight of water as a solvent in the reaction vessel, then add 6 parts by weight of urea and 15 parts by weight of melamine in sequence, stir evenly and add 15 parts by weight of cyanuric acid when the temperature rises to 70°C, stir and heat up to 95 Start keeping warm at ℃, adjust the pH value of the system to 10, and continue stirring for 65 minutes;

[0026] (2) After the obtained reaction product is separated by a centrifuge, the filtrate is recovered, and the solid product is dried at 120° C. and crushed to 3.5 μm to obtain a melamine cyanurate flame retardant.

[0027] The melamine and cyanuric acid are both industrial grade, wherein the mass percentage of melamine is 98%-99.8%, and the mass percentage of cyanuric acid is 97%-98.5%.

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PUM

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Abstract

The invention discloses a preparation method of a trimeric cyanamide cyanurate flame retardant and belongs to the technical field of chemical industry. The method comprises the following steps of: (1) adding 100-120 parts by weight of water used as a solvent into a reaction container, successively adding 4-6 parts by weight of a catalyst and 10-15 parts by weight of melamine, uniformly stirring and heating to 65-75 DEG C, adding 10-15 parts by weight of cyanuric acid, stirring and heating to 95 DEG C, beginning insulation, adjusting pH value of the system to 9-10, continuously stirring and reacting for 45-65 min; and (2) centrifuging the obtained reaction product by the use of a centrifuge, recovering a filtrate, drying the solid product at 100-120 DEG C, and crushing to 1.0-4.0 microns so as to obtain the trimeric cyanamide cyanurate flame retardant.

Description

technical field [0001] The invention relates to a preparation method of a melamine cyanurate flame retardant, which belongs to the technical field of chemical industry. Background technique [0002] Melamine cyanurate (MCA) is a flame retardant product developed by Japan in the 1980s. It is a white crystalline powder with a slippery feel. It is non-toxic, odorless, tasteless, and hardly soluble in water and other organic solvents. , is a nitrogen-based halogen-free flame retardant with excellent performance, and is also an excellent plastic lubricant. Studies have shown that MCA's dual functions of promoting carbonization and foaming during material combustion are the key to its flame retardancy. The flame retardant mechanism is condensed phase catalytic carbonization expansion and gas phase dilution flame retardant mechanism. Take MCA flame-retardant nylon 6 as an example: MCA sublimates and absorbs heat at 350°C and decomposes into melamine and cyanuric acid; cyanuric ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/56C07D251/32
Inventor 张士钊
Owner 张士钊
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