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Basic magnesium borate/magnesium hydroxide composite flame retardant and preparation method thereof

A technology of composite flame retardant and magnesium hydroxide, which is applied in the field of inorganic flame retardants, can solve the problems that have not attracted attention and the utilization rate of boron and magnesium resources is less than 2%, and achieve regular product appearance, good flame retardant effect, and particle size The effect of uniform diameter distribution

Active Publication Date: 2021-12-17
江苏艾特克阻燃材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, 50-80 million tons of bischofite and 30,000-60,000 tons of boric acid resources are by-produced in the Qaidam Basin of Qinghai Province, which have not attracted attention for a long time. They mainly develop some low-value-added coarse-grade products, such as boron and magnesium. Resources are less than 2% utilized

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  • Basic magnesium borate/magnesium hydroxide composite flame retardant and preparation method thereof
  • Basic magnesium borate/magnesium hydroxide composite flame retardant and preparation method thereof
  • Basic magnesium borate/magnesium hydroxide composite flame retardant and preparation method thereof

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preparation example Construction

[0051] The present invention also provides the preparation method of above-mentioned basic magnesium borate / magnesium hydroxide composite flame retardant, refer to figure 1 Shown in process flow sheet, its preparation method may further comprise the steps:

[0052] In step S1, under the stirring intensity of the stirring line speed not lower than 10m / s, add lye to the boron-magnesium salt solution until the pH of the system is 9-14, and react at 45°C-80°C until the precipitation is complete , and continue mixing for no less than 30 minutes to obtain basic magnesium borate / magnesium hydroxide composite slurry.

[0053] Specifically, the boron-magnesium salt solution has the following composition: 90g / L-130g / L Mg 2+ , 0.2g / L~5.5g / L B 3+ , 290g / L~350g / L of Cl - The above-mentioned three kinds of ions are the main components, and also include 0.2g / L~4.5g / L Li + , K of 0.6g / L~1.1g / L + , 1.3g / L~2.8g / L Na + at least one of the

[0054] For this reason, in combination with the ...

Embodiment 1

[0073] The old brine (Mg 2+ The concentration is 92.43g / L, Li + The concentration is 4.378g / L, B 3+ The concentration is 5.323g / L, Cl - concentration of 299.9g / L) mixed with caustic soda solution with a concentration of 365g / L to generate basic magnesium borate / magnesium hydroxide composite slurry, the reaction pH value is controlled at about 12, and the reaction temperature is controlled at 45°C. The solid content in the magnesium / magnesium hydroxide composite slurry is about 9%.

[0074] Transfer the above-mentioned basic magnesium borate / magnesium hydroxide composite slurry into the specially customized high-shear emulsification device of the present invention, refine large particles, take samples regularly to detect particle size changes, until the particle size meets the requirements, and obtain basic magnesium borate / magnesium hydroxide composite fine slurry; particle size control is D in the present embodiment 50 1.25μm, D 90 is 2.47 μm.

[0075] Transfer the bas...

Embodiment 2

[0093] Mix the old brine produced after extracting potassium from the salt lake brine of Jinel Xitai and the caustic soda solution with a concentration of 438g / L to form basic magnesium borate / magnesium hydroxide composite slurry. The reaction pH value is controlled at about 14 and the reaction temperature is controlled at 75 °C, the solid content in the basic magnesium borate / magnesium hydroxide composite slurry is about 10.5%.

[0094] The old brine composition is the same as in Example 1 in the present embodiment.

[0095] Transfer the above-mentioned basic magnesium borate / magnesium hydroxide composite slurry into the specially customized high-shear emulsification device of the present invention, refine large particles, take samples regularly to detect particle size changes, until the particle size meets the requirements, and obtain basic magnesium borate / magnesium hydroxide composite fine slurry; particle size control is D in the present embodiment 50 1.12μm, D 90 is 2...

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Abstract

The invention discloses a basic magnesium borate / magnesium hydroxide composite flame retardant, which comprises homogeneous co-precipitated hexagonal flake magnesium hydroxide and basic magnesium borate. The present invention also provides a method for preparing the above-mentioned basic magnesium borate / magnesium hydroxide composite flame retardant, comprising the steps of: S1, adding excess lye to the boron-magnesium salt solution, and precipitation to completely obtain the basic magnesium borate / magnesium hydroxide composite flame retardant Slurry; S2, high shear dispersion or integrated treatment with grinding to obtain basic magnesium borate / magnesium hydroxide composite fine slurry; S3, hydrothermal reaction of basic magnesium borate / magnesium hydroxide composite fine slurry to obtain composite slurry Flame retardant precursor slurry; S4, the composite flame retardant precursor slurry is subjected to solid-liquid separation, rinsing, re-slurry washing, surface modification, solid-liquid separation, and drying. The homogeneous co-precipitated basic magnesium borate / magnesium hydroxide composite flame retardant obtained by the preparation method, wherein the basic magnesium borate and the magnesium hydroxide can have a more excellent flame retardant performance by producing a synergistic effect.

Description

technical field [0001] The invention belongs to the technical field of inorganic flame retardants, and specifically relates to a basic magnesium borate / magnesium hydroxide composite flame retardant and a preparation method thereof. Background technique [0002] With the enhancement of environmental protection awareness and the promulgation of flame retardant regulations in various countries, the flame retardant market is developing rapidly. Currently widely used flame retardants are halogen-based (mainly chlorine-based and bromine-based), phosphorus-based (including halogen-phosphorus-based) and inorganic flame retardants (mainly including aluminum hydroxide, magnesium hydroxide, red phosphorus, poly ammonium polyphosphate, zinc borate, antimony oxide and molybdenum compounds, etc.). Because halogen flame retardants release a lot of smoke and toxic gases when they burn, developed countries have imposed strict restrictions on their use. With the improvement of living standa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/38C08K3/22
CPCC08K3/38C08K3/22C08K2003/387C08K2003/2224
Inventor 陈同胡守昭
Owner 江苏艾特克阻燃材料有限公司