A kind of method for surface modification of magnesium hydroxide flame retardant

A magnesium hydroxide and surface modification technology, which is applied in dyeing polymer organic compound treatment, dyeing physical treatment, fibrous filler, etc., can solve the problems of high cost and cumbersome modification process, and achieve stable structure and remarkable technological progress , Improve the effect of economic and social benefits

Inactive Publication Date: 2016-08-24
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used surfactants include sodium stearate, sodium oleate, sodium dodecylbenzenesulfonate, etc. The modification process is cumbersome and costly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] (1) Add 30.00gMg(OH) 2 Place in a beaker and place in 10mL deionized water for ultrasonic dispersion for 15min.

[0012] (2) Add 0.30g sodium lignosulfonate to it respectively, continue ultrasonic dispersion for 10min and then vacuum dry.

[0013] (3) Heat the dried mixture to 100°C in an internal mixer, and banbury at a constant temperature for 0.5 hours.

[0014] (4) Finally, cool to room temperature, centrifuge at 4000r / min for 5min, and vacuum-dry at 80°C for 24h after washing several times, grind and sieve through an 80-mesh standard sieve.

[0015] The contact angle test data of this sample decreased from 88.94 before modification to 45.50.

Embodiment 2

[0017] (1) Add 30.00gMg(OH) 2 Place in a beaker and place in 10mL deionized water for ultrasonic dispersion for 15min.

[0018] (2) Add 0.75g sodium lignosulfonate to it respectively, continue ultrasonic dispersion for 20min and then vacuum dry.

[0019] (3) Heat the dried mixture to 120°C in an internal mixer, and banbury at constant temperature for 1 hour.

[0020] (4) Finally, cool to room temperature, centrifuge at 4000r / min for 5min, and vacuum-dry at 80°C for 24h after washing several times, grind and sieve through an 80-mesh standard sieve.

[0021] The contact angle test data of this sample decreased from 88.94 before modification to 32.42.

Embodiment 3

[0023] (1) Add 30.00gMg(OH) 2 Place in a beaker and place in 10mL deionized water for ultrasonic dispersion for 15min.

[0024] (2) Add 1.5g potassium lignosulfonate to it respectively, continue ultrasonic dispersion for 30min and then vacuum dry.

[0025] (3) Heat the dried mixture to 140°C in an internal mixer, and banbury at constant temperature for 1.5 hours.

[0026] (4) Finally, cool to room temperature, centrifuge at 4000r / min for 5min, and vacuum-dry at 80°C for 24h after washing several times, grind and sieve through an 80-mesh standard sieve.

[0027] The contact angle test data of the sample decreased from 88.94 to 25.44 before modification, which obviously improved its lipophilicity.

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Abstract

The invention relates to a method for surface modification of a magnesium hydroxide flame retardant. The method includes the steps: weighing a certain amount of magnesium hydroxide, dissolving the magnesium hydroxide in deionized water, and preparing a solution with the mass percentage of 70-80%, carrying out ultrasonic dispersion for 5-60 minutes, and then adding lignosulfonate into the magnesium hydroxide aqueous solution, wherein the mass of the lignosulfonate is 1%-10% of the mass of the magnesium hydroxide; carrying out ultrasonic dispersion for 5-60 minutes, and then carrying out vacuum drying; and placing the dried mixture in an internal mixer, heating to 100-200 DEG C, carrying out constant-temperature internal mixing for 0.5-3 hours, taking out the sample, cooling to room temperature, centrifuging, washing, carrying out vacuum drying for 10-32 hours, grinding and sieving, and thus obtaining the surface-modified magnesium hydroxide flame retardant. The lignosulfonate is adopted for grafting modification of the magnesium hydroxide, the operation is simple, the cost is low, and the economic benefits are greatly improved; and the magnesium hydroxide flame retardant after modification has the compatibility with high-molecular materials significantly improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a magnesium hydroxide flame retardant, specifically a method for surface modification of the magnesium hydroxide flame retardant. Background technique [0002] Magnesium hydroxide is an inorganic flame retardant, the surface is hydrophilic and oleophobic, while the surface of the polymer is lipophilic and hydrophobic, and the binding force between the two is poor; and because the magnesium hydroxide particles are hexagonal and amorphous, The crystal size is small, the specific surface area is large, there is a great cohesion between the particles, and it is not easy to disperse. Making its dispersion in polymer materials worse will greatly affect the mechanical strength and impact resistance of the material. Therefore, it is necessary to carry out surface modification treatment on the magnesium hydroxide flame retardant. The surface modification of magnesium hydroxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/10
Inventor 于圣洁房永征张娜张灵彦刘冯新
Owner SHANGHAI INST OF TECH
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