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Rodlike crystalline melamine cyanurate fire retardant and preparation method thereof

A technology of melamine cyanurate and melamine is applied in the field of preparation of polymer material flame retardants, which can solve the problems of increasing production cost and workload, large consumption, reducing mechanical properties of substrates, etc., so as to reduce liquid-solid ratio and reaction Time, good flow performance, improve the effect of reaction efficiency and equipment utilization

Active Publication Date: 2011-09-07
JINAN TAIXING FINE CHEM
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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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  • Rodlike crystalline melamine cyanurate fire retardant and preparation method thereof
  • Rodlike crystalline melamine cyanurate fire retardant and preparation method thereof
  • Rodlike crystalline melamine cyanurate fire retardant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Proportion: melamine 98, cyanuric acid 103, water 1200, glacial acetic acid 2

[0028] 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%.

[0029] Preparation method: Weigh the raw materials according to the above weight parts for later use, add 1200 parts of water into the reaction kettle, then add 2 parts of glacial acetic acid and 98 parts of melamine in sequence, stir evenly and heat up to 80°C, add 103 parts of cyanuric acid, stir and heat up to Start heat preservation at 95°C, continue to stir and react for 50 minutes to generate melamine cyanurate slurry, filter, dry and pulverize the melamine cyanurate slurry to obtain a particle size of 3.1 μm and a moisture content of less than 0.03%. Rod crystal structure melamine cyanurate powder product, the MCA*2700 times polarized light transmission / reflection microscope photo prepared in this embodiment is ...

Embodiment 2

[0031] Proportion: melamine 100, cyanuric acid 110, water 1400, oxalic acid 1

[0032] 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%.

[0033] Preparation method: Weigh the raw materials according to the above weight parts for later use, add 1400 parts of water to the reaction kettle, then add 1 part of oxalic acid and 110 parts of cyanuric acid in sequence, stir evenly and heat up to 75°C, add 100 parts of melamine, stir and heat up to 100°C Start to keep warm, and continue stirring for 40 minutes to generate melamine cyanurate slurry. The melamine cyanurate slurry is filtered, dried and pulverized to obtain a rod-shaped crystal structure melamine cyanurate powder product with a particle size of 3.5 μm and a moisture content of less than 0.04%. The MCA × 2700 prepared in this example See figure 2 .

Embodiment 3

[0035] Proportion: melamine 106, cyanuric acid 94, water 1600, anhydrous sodium carbonate 1

[0036] 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%.

[0037] Preparation method: Weigh the raw materials according to the above weight parts for later use, add 1600 parts of water to the reaction kettle, then add 1 part of anhydrous sodium carbonate and 94 parts of cyanuric acid in sequence, stir evenly and heat up to 65 ° C, add 106 parts of melamine, stir and heat up Start to keep warm at 90°C, and continue stirring for 80 minutes to generate melamine cyanurate slurry. The melamine cyanurate slurry is filtered, dried and pulverized to obtain a rod-shaped crystal structure melamine cyanurate powder product with a particle size of 4.1 μm and a moisture content of less than 0.04%. The MCA×2700 prepared in this example See image 3 .

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Abstract

The invention discloses a rodlike crystalline melamine cyanurate fire retardant and a preparation method thereof. The fire retardant is prepared from the following raw materials in parts by weight: 90-110 parts of melamine, 90-110 parts of cyanuric acid, 1,200-1,600 parts of water and 1-3 parts of modifier and is characterized in that the modifier is added during preparation of melamine cyanurate (MCA); and growth of an MCA large-plane hydrogen bond network structure is limited by a strong hydrogen bonding action and steric hindrance between the modifier and the MCA, so that the MCA crystalline structure preferentially grows in a certain direction to form rodlike crystals. The method has the advantages of simple process, short production time and high efficiency; and the prepared fire retardant has high purity and processing liquidity in a plastic matrix, and mechanical property of the plastic can be improved.

Description

technical field [0001] The invention belongs to the field of preparation of flame retardants for polymer materials, in particular to a rod-shaped crystal melamine cyanurate flame retardant and a preparation method thereof. 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 d...

Claims

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Application Information

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IPC IPC(8): C08K7/00C08K7/02C08K5/3492C08L77/02C07D251/70
Inventor 牛民卜包金远肖学文戴长林
Owner JINAN TAIXING FINE CHEM
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