Method for preparing melamine cyanurate with large particle size and wide distribution

A technology of melamine cyanurate and melamine, which is applied in the field of preparation of melamine cyanurate with large particle size and wide distribution, can solve the problems of process limitation, suction filtration and drying, increase the difficulty of mixing and extrusion processing, and product accumulation Low density and other issues, achieve excellent flame retardant effect, improve flame retardant effect and mechanical properties, and avoid equipment corrosion

Active Publication Date: 2012-07-18
JINAN TAIXING FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of ordinary MCA prepared by the existing method is concentrated below 3um, and the bulk density of the product is small, generally 0.3g / cm 3 , there is a secondary agglomeration phenomenon, which increases the difficulty of mixing and extrusion processing during the processing of nylon, which easily causes uneven dispersion, unstable flame retardancy, and decreased mechanical strength; and the small particle size and distribution of ordinary MCA lead to product Suction filtration is difficult, resulting in the entire product process being limited by suction filtration and drying links, which affects production efficiency

Method used

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  • Method for preparing melamine cyanurate with large particle size and wide distribution
  • Method for preparing melamine cyanurate with large particle size and wide distribution
  • Method for preparing melamine cyanurate with large particle size and wide distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 560.12kg of water to a 1500L reactor, add 80.59kg of cyanuric acid, heat up to 70°C and stir to dissolve, mix 75kg of melamine and 7.78kg of polyacrylamide evenly, add them, heat up to 98°C, and react at a constant temperature for 3 hours under stirring to obtain White slurry, convey the slurry into a filter press for dehydration to obtain a white filter cake, which is put into a flash dryer for flash drying, and then pulverized to obtain a white MCA powder with an average particle size of 22.6 μm.

[0016] The comparison between the performance index of the product of this embodiment and the common MCA index is shown in Table 1 below.

[0017] Table 1 product of the present invention and common product performance index contrast

[0018]

[0019] It can be seen from the above table that the MCA prepared in this example fully meets the index requirements, and the average particle size is 22.6 μm, the median particle size is 17.9 μm, and the maximum particle size ...

Embodiment 2

[0021] Add 233.4kg of water into a 1500L reactor, add 20.15kg of cyanuric acid, heat up to 110°C and stir to dissolve, mix 18.75kg of melamine and 1.95kg of polyacrylamide evenly and add, stir and react at a constant temperature for 5 hours at 110°C to obtain white Slurry, the slurry is transported into a filter press for dehydration to obtain a white filter cake, which is sent to a flash dryer for flash drying, and then crushed to obtain a white MCA powder with a large particle size and a wide distribution.

Embodiment 3

[0023] Add 560.13kg of water into a 1500L reactor, add 96.71kg of cyanuric acid, heat up to 60°C and stir to dissolve, mix 90kg of melamine and 0.93kg of polyacrylamide evenly, add them, heat up to 95°C, and react at a constant temperature for 2 hours under stirring to obtain White slurry, the slurry is transported into a filter press for dehydration to obtain a white filter cake. The filter cake enters a flash dryer for flash drying and then crushed to obtain a white MCA powder with large particle size and wide distribution.

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Abstract

The invention discloses a method for preparing melamine cyanurate with large particle size and wide distribution, and belongs to the technical field of preparation of flame retardants. The method comprises the following steps of: preparing raw materials, namely melamine and cyanuric acid in a molar ratio of 1:1.05, adding a solvent, namely water in an amount which is 3 to 6 times the total mass of the melamine and the cyanuric acid into a reaction kettle, adding the cyanuric acid into the reaction kettle, and heating to the temperature of between 60 and 110 DEG C with stirring; adding the melamine and a macromolecular nucleating agent, and reacting at the temperature of between 95 and 110 DEG C for 1.5 to 5 hours with stirring to obtain white slurry; and performing pressure filtering on the slurry, drying, and grinding to prepare white powdered melamine cyanurate with the particle size of 15 to 100mu m. The melamine cyanurate with large particle size and wide distribution is easily subjected to suction filtering and dried, so that production efficiency is improved; and the melamine cyanurate serving as a flame-retardant additive has high dispersibility in a macromolecular materialsubstrate, and the flame-retardant effect and mechanical property of the substrate material are improved.

Description

technical field [0001] The invention relates to a preparation method of melamine cyanurate (MCA) with large particle size and wide distribution, and belongs to the technical field of flame retardant preparation. Background technique [0002] Melamine cyanurate, referred to as MCA, is a nitrogen-based halogen-free flame retardant with excellent performance. It fully complies with the EU ROHS directive and REACH regulations. It is widely used in rubber, nylon, epoxy resin, acrylic emulsion, and polytetrafluoroethylene. It can be used as halogen-free flame retardant in resin and plastic products, as solid lubricating additive in lubricating oil and grease, as flame retardant and matting aid in fireproof coating, as lubricant in cosmetics, MCA is especially suitable for non- Filled nylon 6 (PA6) and nylon 66 (PA66), the flame retardant products can reach UL94V-0 level (960 ℃, 1.6mm). [0003] At present, MCA is generally prepared by using water as the dispersion medium, using m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/04C08K5/3492C08L21/00C08L77/00C08L63/00C08L33/00C08L27/18C08L101/00
Inventor 牛民卜李加智
Owner JINAN TAIXING FINE CHEM
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