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Modification method of nano-magnesium hydroxide

A nano-magnesium hydroxide and modification technology, which is applied in the treatment of dyed organic silicon compounds, fibrous fillers, etc., can solve problems such as difficult to achieve nano-dispersion modification effects, and achieve mild conditions, reduced energy consumption, and good dispersibility Effect

Inactive Publication Date: 2009-02-18
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because nano-magnesium hydroxide is very easy to form agglomerates, it is difficult to achieve true nano-dispersion and obtain a good modification effect through general high-speed emulsification and shear mixing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 5g of dry nano-magnesium hydroxide powder and 95ml of deionized water into a 150ml beaker placed in an ultrasonic tank, start the stirrer, and control the speed at 800rpm; turn on the ultrasonic wave at the same time, control the ultrasonic frequency to 59KHz, and the ultrasonic power to 100W. Ultrasonic dispersion activation treatment was performed for 30 minutes.

[0021] Then adjust the stirring speed to 600 rpm, adjust the ultrasonic power to 50 W, and keep the ultrasonic frequency unchanged, slowly add 0.1 g of sodium oleate modifier, and perform ultrasonic modification for 15 minutes. The modified magnesium hydroxide is filtered and washed, dried at 110° C. for 10 hours, and ground through a 250-mesh sieve to obtain surface-modified nano magnesium hydroxide powder.

Embodiment 2

[0023] Add 4g of dry nano-magnesium hydroxide powder and 96ml of deionized water into a 150ml beaker placed in an ultrasonic tank, start the stirrer, and control the speed at 1000rpm; turn on the ultrasonic wave at the same time, control the ultrasonic frequency to 33KHz, and the ultrasonic power to 100W. Ultrasonic dispersion activation treatment for 50 minutes.

[0024] Then adjust the stirring speed to 700rpm, adjust the ultrasonic power to 50W, and keep the ultrasonic frequency unchanged, slowly add 0.15g titanate coupling agent NXT-401, and carry out ultrasonic modification treatment for 10 minutes. The modified magnesium hydroxide is filtered and washed, dried at 120° C. for 8 hours, and ground through a 250-mesh sieve to obtain surface-modified nano magnesium hydroxide powder.

Embodiment 3

[0026] Add 8g of dried nano-magnesium hydroxide powder and 92ml of deionized water into a 150ml beaker placed in an ultrasonic tank, start the stirrer, and control the speed at 800rpm; turn on the ultrasonic wave at the same time, control the ultrasonic frequency to 80KHz, and the ultrasonic power to 200W. Ultrasonic dispersion activation treatment was performed for 20 minutes.

[0027] Then adjust the stirring speed to 700 rpm, the ultrasonic power to 150 W, and the ultrasonic frequency to 59 KHz, slowly add 0.25 g of silane coupling agent KH570 modifier, and perform ultrasonic modification for 25 minutes. The modified magnesium hydroxide is filtered and washed, dried at 110° C. for 20 hours, and ground through a 250-mesh sieve to obtain surface-modified nano magnesium hydroxide powder.

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Abstract

The invention relates to a modification method of nano magnesium hydroxide, which comprises the following steps: nano magnesium hydroxide powder is added into deionized water to be prepared into slurry; the slurry is added into a container which is arranged in an ultrasonic trough and provided with a stirrer to be stirred and receives ultrasonic dispersing activation treatment; and then surface modifier is added in to continue the ultrasonic stirring modification; the modified magnesium hydroxide receives suction filtration and is washed, heated, dried, ground and screened to obtain surface modified magnesium hydroxide powder. The method really realizes the nano dispersion of nano particles in the solution and modifies the surface of the nano particles with the help of the multiple functions of ultrasonic cavitation to the dispersion and surface activation of the nano particles as well as the accelerated hydrolysis, accelerated polymerization and polycondensation reaction of the modifier. The surface modification is carried out at normal temperature, so that the process is simplified, the time is short, the efficiency is high and the energy consumption is greatly reduced; the prepared modified nano magnesium hydroxide powder has good dispersivity, and the size and distribution of the particles are even.

Description

technical field [0001] The invention belongs to the technical field of superfine inorganic powder surface modification, and in particular relates to a method for modifying nano-magnesium hydroxide using ultrasonic waves. Background technique [0002] Mg(OH) 2 As an important inorganic flame retardant, it has the characteristics of high decomposition temperature, high thermal stability, non-toxic, smoke-free and smoke-suppressing. The demand for non-halogenated, low-toxicity and smoke-suppressing flame retardants is one of the most cost-effective flame retardants, and it has been widely valued and widely used in the field of polymer flame retardancy. Especially nano Mg(OH) 2 Flame retardants can better exert their flame retardant effect on polymers and minimize the impact on the mechanical properties and processing properties of materials, which has become a hot spot in the current flame retardant research. However, due to the small particle size and large specific surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/12
Inventor 万军喜唐国翌李俊
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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