Method for integrally preparing high-dispersity ultrafine magnesium hydroxide flame retardant

A technology of ultra-fine magnesium hydroxide and magnesium hydroxide, applied in the direction of magnesium hydroxide, dyed organic silicon compound treatment, fibrous filler, etc., can solve the problems of complex process flow and high energy consumption, shorten the process flow and improve production Benefits, the effect of breaking through the technical problems of secondary coagulation and bonding

Inactive Publication Date: 2014-03-26
江苏艾特克阻燃材料有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

The existing process technology mainly adopts dry method modification, which

Method used

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  • Method for integrally preparing high-dispersity ultrafine magnesium hydroxide flame retardant

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Effect test

Embodiment 1

[0029] Prepare 4.5mol / L of MgCl 2 Solution 1000L and 9.0mol / L NH 3 ·H 2 O solution 1000L, respectively heated to about 35°C, the two solutions are simultaneously added to a closed reaction vessel with a stirring speed of 1500rpm through a metering pump at a feeding rate of 500ml / min, and the magnesium hydroxide synthetic slurry stays in the reaction vessel The time is about 10 minutes, the temperature during the residence process is 100° C., and the stirring speed is 1500 rpm. Transfer the magnesium hydroxide synthetic slurry into the aging device, and after aging for 20mim at 100°C, filter and wash the magnesium hydroxide synthetic slurry to make the water content about 50wt%, and the impurity Cl in the solid matter - ≦0.05wt%, Fe 3+ ≦0.05wt%, to get D50=5μm high-purity magnesium hydroxide wet cake.

Embodiment 2

[0031] Prepare 4.5mol / L of MgCl 2 Solution 1000L and 9.0mol / L NH 3 ·H 2 O solution 1000L, respectively heated to about 35°C, the two solutions are simultaneously added to a closed reaction vessel with a stirring speed of 500rpm through a metering pump at a feeding rate of 100ml / min, and the synthetic magnesium hydroxide slurry stays in the reaction vessel The time is about 20 minutes, the temperature during the residence process is 80° C., and the stirring speed is 500 rpm. Transfer the magnesium hydroxide synthetic slurry into the aging device, and after aging for 20mim at 80°C, filter and wash the magnesium hydroxide synthetic slurry to make the water content about 40wt%, and the impurity Cl in the solid matter - ≦0.05wt%, Fe 3+ ≦0.05wt%, to get D50=10μm high-purity magnesium hydroxide wet cake.

Embodiment 3

[0033] Prepare 0.5mol / L MgCl 2 Solution 1000L and 2.5mol / L NH 3 ·H 2 O solution 1000L, respectively heated to about 60°C, the two solutions are simultaneously added to a closed reaction vessel with a stirring speed of 50rpm through a metering pump at a feeding rate of 10ml / min, and the synthetic magnesium hydroxide slurry stays in the reaction vessel The time is about 30 minutes, the temperature during the residence process is 60°C, and the stirring speed is 50rmp. Transfer the magnesium hydroxide synthetic slurry into the aging device, and after aging for 30mim at 60°C, filter and wash the magnesium hydroxide synthetic slurry to make the water content about 40wt%, and the impurity Cl in the solid matter - ≦0.05wt%, Fe 3+ ≦0.05wt%, to get D50=50μm high-purity magnesium hydroxide wet cake.

[0034] Grinding and Surface Modification Magnesium Hydroxide

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Abstract

The invention discloses a method for integrally preparing a high-dispersity ultrafine magnesium hydroxide flame retardant, which comprises the following steps: continuously synthesizing high-purity magnesium hydroxide; and carrying out single cycle wet grinding and surface modification on magnesium hydroxide and integrally implementing particle size control and surface processing of the magnesium hydroxide flame retardant. According to the invention, the technical difficulties of control on purity, slurry viscosity, particle size, particle size distribution and specific surface area of the magnesium hydroxide flame retardant, the existence of the phenomena of secondary coagulation and bonding during the drying process and the like; a hydrophilic surface of magnesium hydroxide flame retardant powder is modified into a lipophilic surface, so that the intermiscibility and dispersity of the powder in a macromolecule polymeric material are improved, the influence of the high-dispersity ultrafine magnesium hydroxide flame retardant on the processing performance and the mechanical performance of a polymer product is reduced, and the comprehensive properties of the macromolecule polymer, such as flame retardance, processing, mechanics, electrics, are optimized.

Description

technical field [0001] The invention relates to the field of preparation of magnesium hydroxide flame retardants, in particular to an integrated method for preparing highly dispersed ultrafine magnesium hydroxide flame retardants. Background technique [0002] The development trend of international flame retardants in the 21st century is moving towards environmental protection, low toxicity, low smoke, high efficiency, and multi-functionality. Many foreign countries have restricted the production and use of flame retardants that pollute the environment. Europe has begun to restrict the sales of halogen-containing flame retardants, Japan prohibits the use of acid gas flame retardants when cables are burned, and the United States has formulated regulations for the use of low-halogen cable coatings. With the rapid development of China's economic construction, the improvement of safety performance requirements, people's emphasis on green and environmental protection, and the inf...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/12C09C3/04C01F5/20C08K9/10C08K9/06C08K9/04C08K3/22C08L23/08C08L23/06C08L75/04C08L23/00C08L67/06
Inventor 陈同
Owner 江苏艾特克阻燃材料有限公司
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