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Modified magnesium hydroxide, preparation method thereof and application thereof in polymer

A magnesium hydroxide and polymer technology, applied in the direction of dyeing organosilicon compound treatment, dyeing low-molecular-weight organic compound treatment, fibrous filler, etc., can solve the problems of low flame retardant efficiency, poor compatibility of matrix resin, etc. low effect, improved compatibility, simple equipment and process

Inactive Publication Date: 2010-07-28
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a commonly used halogen-free flame retardant, magnesium hydroxide has many advantages such as wide source of raw materials, low price, good thermal stability, no volatilization, no precipitation, no toxic gas, no corrosion of processing equipment, and obvious smoke suppression effect. It has attracted much attention due to its advantages, and its main disadvantages are low flame retardant efficiency and poor compatibility with the matrix resin. To make the flame retardant properties of flame retardant polymer materials meet certain requirements, its addition amount often must reach the flame retardant More than 60% of the total mass of the flame retardant polymer material, which will have a great negative impact on the processing performance and mechanical properties of the flame retardant polymer material, so it is necessary to modify the surface of the magnesium hydroxide flame retardant
[0003] At present, the existing modified magnesium hydroxide is applied to the matrix resin, and the obtained flame-retardant polymer materials only have improved mechanical properties or improved flame-retardant properties.

Method used

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  • Modified magnesium hydroxide, preparation method thereof and application thereof in polymer
  • Modified magnesium hydroxide, preparation method thereof and application thereof in polymer
  • Modified magnesium hydroxide, preparation method thereof and application thereof in polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 10g of magnesium hydroxide (particle size 5000 mesh, Shenyang Donggao Superfine Powder Material Engineering Co., Ltd.) was mechanically stirred in the reactor (control temperature at 70°C, stirring speed at 1000r / min) for 20min, and slowly added according to the table 1 metered silicone oil, control the dropping rate to 1mL / min. Then continue to stir for 30min to obtain modified magnesium hydroxide.

[0026] Take 0.4g of modified magnesium hydroxide in a vacuum oven at 90°C to constant weight w o , and then put it into a desiccator with 100mL distilled water, keep the temperature at 25°C until the constant weight w 1 , using the formula The water absorption rate of magnesium hydroxide modified with different contents of silicone oil can be obtained.

[0027] Table 1 Water absorption of magnesium hydroxide modified with different contents of silicone oil

[0028]

[0029] It can be seen from Table 1 that different contents of silicone oil have a certain modificat...

Embodiment 2

[0031] Mechanically stir 10g of magnesium hydroxide in a reactor (control temperature at 60°C, stirring speed at 1000r / min) for 20min, slowly add toluene diisocyanate measured according to Table 2, control the dropping rate at 1mL / min, and continue stirring for 30min , to obtain modified magnesium hydroxide.

[0032] The water absorption test conditions are the same as above.

[0033] Table 2 Water absorption of magnesium hydroxide modified with different contents of toluene diisocyanate

[0034]

[0035] As can be seen from Table 2, different contents of toluene diisocyanate have a certain modification effect on magnesium hydroxide. When its content is 1.8% by mass, the water absorption is the lowest, that is, the surface modification effect on magnesium hydroxide is the highest at this time. good.

Embodiment 3

[0037] 10g of magnesium hydroxide was mechanically stirred in the reactor (controlling temperature at 60°C, stirring speed at 1000r / min) for 20min, slowly added diphenylmethane diisocyanate measured according to Table 3, and the controlled addition rate was 1mL / min, Continue to stir for 30min to obtain modified magnesium hydroxide.

[0038] The water absorption test conditions are the same as above.

[0039] Table 3 Water absorption of magnesium hydroxide modified with diphenylmethane diisocyanate

[0040]

[0041] As can be seen from Table 3, different contents of diphenylmethane diisocyanate have a certain modification effect on magnesium hydroxide. When its content is 2.4% by mass, the water absorption is the lowest, that is, the surface modification of magnesium hydroxide is at this time. Sex works best.

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Abstract

The invention discloses modified magnesium hydroxide, a preparation method thereof and application thereof in a polymer. The preparation method of the invention comprises the following steps: stirring magnesium hydroxide for 20-30min at the temperature of 30-120 DEG C while adding modifier slowly and evenly; and continuously stirring for 30-90min to obtain the modified magnesium hydroxide, wherein, the modifier is at least one of stearic acid, silicone oil, toluene diisocyanate or diphenyl methane diisocyanate. The preparation method improves the thermal stability of the magnesium hydroxide and the compatibility of the modified magnesium hydroxide with polymer; and when the obtained magnesium hydroxide is applied to preparing a fire retardant polymer, even the use amount of the modified magnesium hydroxide reaches 60% of the total weight of the polymer material, and the processability and mechanical property of the obtained fire retardant polymer are obviously improved and meet the requirement of fire resistance. The obtained modified magnesium hydroxide of the invention has simple used device and process, low production cost and capability of being widely applied to industrial production processes.

Description

technical field [0001] The invention relates to the fields of chemical industry and materials, in particular to a modified magnesium hydroxide and its preparation method and its application in polymers. Background technique [0002] With the rapid development of the plastics industry, the demand for flame-retardant polymers is increasing day by day. Halogen-containing polymer materials have good flame retardancy and mechanical properties, but they will produce a lot of smoke and toxic and corrosive hydrogen halide gas when burning, which is the main cause of casualties in fire accidents. Therefore, research and development Halogen-free, low-smoke, non-toxic and non-corrosive flame-retardant polymer materials are of great significance. As a commonly used halogen-free flame retardant, magnesium hydroxide has many advantages such as wide source of raw materials, low price, good thermal stability, no volatilization, no precipitation, no toxic gas, no corrosion of processing equ...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/08C09C3/12C08L9/00C08L9/06C08L83/04C08L23/06C08L23/12C08L27/06C08L25/06C08L23/08C08L31/04C08L25/10C08L55/02C08L53/02C08K9/04C08K9/06C08K3/22
Inventor 陈鸣才连肖南许凯
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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