Method for preparing magnesium hydroxide/silicon dioxide composite inorganic flame retardant

An inorganic flame retardant and silicon dioxide technology, applied in the direction of fire-resistant coatings, etc., can solve the problems of poor shape controllability, complex preparation process, poor dispersion, etc., to reduce production costs, shorten process time, and increase production feasibility Effect

Inactive Publication Date: 2009-10-07
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research and production of magnesium hydroxide flame retardants in China are still in their infancy, and there are problems such as complex preparation process, low purity, poor shape controllability, poor dispersion, and low output, which greatly limit the development of magnesium hydroxide flame retardants. production and application

Method used

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  • Method for preparing magnesium hydroxide/silicon dioxide composite inorganic flame retardant
  • Method for preparing magnesium hydroxide/silicon dioxide composite inorganic flame retardant
  • Method for preparing magnesium hydroxide/silicon dioxide composite inorganic flame retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0030] The surface of the product is a honeycomb core-shell structure composite flame retardant.

[0031] The operation steps are as follows:

[0032] (1) 3 kilograms of magnesium chloride is formulated into 1.5mol / L aqueous solution; 2.5% (mass percentage) polyethylene glycol is added in the magnesium chloride solution.

[0033] (2) Take 10 liters of the silica suspension and dilute it 2 times with 80 parts of water and 20 parts of ethanol.

[0034] (3) water bath, the temperature is controlled at 30 ° C, under the condition of vigorous stirring, get 80 liters of demineralized water and put it into the reactor as a buffer solution, and the magnesium chloride solution and the silicon dioxide suspension are added to the buffer solution at the same time to react; two solutions The addition rate was 1.0 liter / hour. Stirring was continued for 1 h after the addition was complete.

[0035] (4) remove the supernatant after the natural sedimentation of the reaction product, then re...

Embodiment approach 2

[0039] The surface of the product is a grooved core-shell structure composite flame retardant.

[0040] The operation steps are as follows:

[0041] (1) Take 5 liters of 1.0mol / L magnesium sulfate solution and put it into a container. Add 2.6% (mass percentage, the same below) polyethylene glycol and 2.5% sodium dodecylbenzenesulfonate to the magnesium sulfate solution.

[0042] (2) Take 20 liters of the silica suspension and dilute it 10 times with water.

[0043] (3) In a water bath at 60°C and under vigorous stirring, 100 liters of demineralized water was put into the reactor as a buffer solution, and magnesium sulfate solution and silicon dioxide suspension were added to the buffer solution at the same time for reaction, and the addition rate was about 10.0 liters / Hour. After the solution was added, stirring was continued for 5 h.

[0044] (4) After the reaction product settles naturally, the supernatant is removed, and then the precipitate is fully washed with demine...

Embodiment approach 3

[0048] Preparation of magnesium hydroxide / silica core-shell structure composite flame retardant by using seawater.

[0049]The operation steps are as follows:

[0050] (1) Get 300 kilograms of clean seawater that has been processed, add 200 grams of ammonium lignosulfonate;

[0051] (2) Get 5 liters of silicon dioxide suspension and dilute it 40 times with water and ethanol;

[0052] (3) In a water bath at 90°C and vigorously stirred, the silica suspension was slowly added to seawater for reaction. Continue stirring for 12 h after the addition of the solution;

[0053] (4) remove the supernatant after the natural sedimentation of the reaction product, then fully wash the precipitate with demineralized water;

[0054] (5) The precipitate was filtered, and the filter cake was dried in a vacuum drying oven for 5 hours at a drying temperature of 160° C., then cooled naturally to room temperature, and sealed for storage.

[0055] Product SEM photo as Figure 5 , the product is...

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Abstract

The invention provides a method for preparing a spherical magnesium hydroxide / silicon dioxide composite inorganic flame retardant with a core-shell structure under normal pressure, which comprises the following sequential steps of: (1) hydrolyzing tetraethoxy silane for obtaining amorphous silica microspheres; (2) preparing magnesium salt into a solution with a certain concentration, or taking purified halogen / sea water after purifying treatment as magnesium salt solution for reaction; (3) adding surface active agent into the magnesium salt solution which is then reacted with silica suspension at normal pressure and certain temperature; (4) and fully washing and filtering the precipitate and finally obtaining magnesium hydroxide / silicon dioxide composite inorganic flame retardant powder by drying, sealing and storing. The method is operated under normal pressure, and has simple process, controllable size and appearance of the prepared composite flame retardant, good dispersity, controllability and feasibility of batch preparation.

Description

technical field [0001] The invention relates to a preparation method of a magnesium hydroxide inorganic flame retardant, in particular to a preparation method of a core-shell structure spherical magnesium hydroxide / silicon dioxide composite inorganic flame retardant prepared by a template method, belonging to a composite inorganic flame retardant category. Background technique [0002] In recent years, due to the consideration of protecting the environment and human life and health, as well as the strict restrictions on the use of halogenated organic flame retardants in European and American countries, the research, production and application of environmentally friendly inorganic flame retardants are imminent. my country's rich magnesium resources make domestic magnesium hydroxide flame retardants have broad research and production prospects and great development potential. [0003] Since the 1990s, people began to pay attention to magnesium hydroxide flame retardants, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K21/02
Inventor 杜芳林潘杰李斌
Owner QINGDAO UNIV OF SCI & TECH
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