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Preparation and synthesis method of hexagonal flaky magnesium hydroxide fire retardant

A technology of magnesium hydroxide and a synthesis method, applied in directions such as magnesium hydroxide, can solve the problems of uncontrollable particle size of flaky magnesium hydroxide, low surface polarity and surface energy, poor morphology stability, etc. Good stability, improved mechanical properties, good dispersion effect

Inactive Publication Date: 2017-05-17
ANHUI ESTONE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the preparation method can obtain flake magnesium hydroxide flame retardant, the particle size of flake magnesium hydroxide is uncontrollable and the dispersibility is not ideal, and the flake magnesium hydroxide produced is irregular flake or disc shape, hydrogen The flaky state of magnesium oxide is uncontrollable, and the shape stability is not good; compared with the disc shape, the crystallization state of the hexagonal flaky magnesium hydroxide is better, and it has lower surface polarity and surface energy, which makes the magnesium hydroxide The surface energy is closer to the surface energy of the polymer, so the compatibility and dispersion of the hexagonal sheet-shaped magnesium hydroxide with polymer materials such as plastics and resins are better, so compared with the irregular shape of the sheet, Hexagonal flaky magnesium hydroxide improves the flame retardant properties of polymer materials while improving the bending ability and ductility of materials, thereby improving the mechanical properties of polymer materials

Method used

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  • Preparation and synthesis method of hexagonal flaky magnesium hydroxide fire retardant
  • Preparation and synthesis method of hexagonal flaky magnesium hydroxide fire retardant
  • Preparation and synthesis method of hexagonal flaky magnesium hydroxide fire retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Add magnesium salt solution (concentration range is 1mol / L), crystal directing agents A1 and B1 (concentration range is 7.2×10-3g / L) into the reaction vessel, stir evenly at 35°C, and place Inorganic alkali solution (concentration range is 4mol / L) is added dropwise into the reaction vessel at a constant rate (rate range is 15L / min). After the reaction is complete, the reaction slurry is ultrasonically oscillated for 20 minutes and then transferred to a volume of 1m3 under high pressure. In the reaction kettle, add absolute ethanol (80%-95% ethanol by mass fraction, the addition accounts for 6% of the total volume), carry out the hydrothermal reaction temperature is 180 ℃, and the reaction time is 40h, finally through pressure filtration, water washing, Alcohol washing, drying made magnesium hydroxide product, the product's SEM, DTG-TG and XRD test results are as attached figure 1 , attached Figure 4 And attached Figure 5 shown.

Embodiment 2

[0038] Add magnesium salt solution (concentration range is 3mol / L), crystal directing agents A2 and B2 (concentration range is 3.5×10-2g / L) in reaction vessel, stir evenly under the condition of 46 ℃, under this temperature condition Inorganic alkaline solution (concentration range: 5.5mol / L) was added dropwise into the reaction vessel at a constant rate (rate range: 25L / min). After the reaction was complete, the reaction slurry was ultrasonically oscillated for 26 minutes and then transferred to a volume of 1m3 In the autoclave, add absolute ethanol (ethanol with a mass fraction of 80%-95%, the amount added accounts for 11% of the total volume), carry out the hydrothermal reaction temperature at 200°C, and the reaction time is 48h, and finally pass through pressure filtration and water washing , alcohol washing, and drying to obtain magnesium hydroxide products, the SEM test results of the products are attached figure 2 shown.

Embodiment 3

[0040] Add magnesium salt solution (concentration range is 2.6mol / L) in reaction vessel, stir evenly under 48 ℃ of conditions, under this temperature condition, inorganic alkali solution (concentration range is 5.8mol / L) with constant rate (rate The range is 31L / min) into the reaction vessel dropwise, after the reaction is complete, the reaction slurry is ultrasonically oscillated for 28min and then transferred to a volume of 1m3 high-pressure reactor, adding absolute ethanol (mass fraction 80%-95%) Ethanol, the addition accounts for 17% of the total volume), the hydrothermal reaction temperature is 190°C, the reaction time is 38h, and finally the magnesium hydroxide product is obtained through pressure filtration, water washing, alcohol washing and drying, and the SEM test of the product The results are attached image 3 .

[0041] attached by figure 1 It can be seen that the magnesium hydroxide flame retardant material produced by the system of adding crystallization direc...

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Abstract

The invention provides a preparation and synthesis method of hexagonal flaky magnesium hydroxide fire retardant, and relates to the field of material chemistry. The preparation and synthesis method comprises the following steps of adding a magnesium salt solution and a crystal-directing agent in a reaction vessel; uniformly stirring under the condition that the temperature is 30 to 50 DEG C, and dropwise adding an inorganic base solution in the reaction vessel at a constant rate under the condition that the temperature is 30 to 50 DEG C; carrying out ultrasonic oscillation on reaction slurry for 20 to 30 minutes after reacting completely, and transferring the reaction slurry to a high-pressure reaction kettle; adding absolute ethyl alcohol; carrying out hydrothermal reaction, wherein the reaction temperature is 180 to 200 DEG C, and the reaction time is 24 to 48 hours; finally carrying out filter pressing, water washing, alcohol washing and drying, thus obtaining a magnesium hydroxideproduct. According to the preparation and synthesis method of the hexagonal flaky magnesium hydroxide fire retardant, provided by the invention, the hexagonal flaky magnesium hydroxide fire retardantis in a hexagonal flaky and monodispersed state due to the addition of the crystal-directing agent; compared with literatures and other patents, the hexagonal flaky magnesium hydroxide fire retardanthas the characteristics that the morphology is more stable, the particle size is more uniform, and the like.

Description

technical field [0001] The invention relates to the field of material chemistry, in particular to a method for preparing and synthesizing a hexagonal flake magnesium hydroxide flame retardant. Background technique [0002] Due to the rapid development of synthetic polymer materials and the enhancement of environmental awareness in recent years, the use of inorganic flame retardants is increasing. Magnesium hydroxide is a high-efficiency inorganic flame retardant. It has the characteristics of high decomposition temperature, high thermal stability, non-toxic, and smokeless. It is a green and environmentally friendly flame retardant. The demand for non-halogenated, low-toxicity, and smoke-suppressing flame retardants, and at the same time, it can be used in conjunction with flame retardants such as zinc borate, aluminum hydroxide, and ammonium polyphosphate, which can reduce its addition amount and make the polymerization after adding flame retardants The mechanical properties ...

Claims

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Application Information

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IPC IPC(8): C01F5/22C01F5/20
CPCC01F5/22C01F5/20C01P2002/72C01P2002/80C01P2004/03C01P2004/61
Inventor 蒋学鑫王亚娟苏迪郭敬新
Owner ANHUI ESTONE MATERIAL TECH CO LTD
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