Preparation method of magnesium-hydroxide-coated calcium carbonate inorganic composite flame retardant filler

A technology of magnesium hydroxide and flame-retardant fillers, which is applied in the direction of inorganic pigment treatment, chemical instruments and methods, and fibrous fillers. Problems such as high cost, achieve good application prospects, increase functions, and reduce production costs

Active Publication Date: 2014-05-07
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production cost of high-purity magnesium hydroxide produced by chemical methods is relatively high, and a large amount of saline wastewater that needs to be treated is produced during the production process, which causes a certain pressure on the environment; in addition, the oil absorption value of ultra-fine magnesium hydroxide for flame retardancy Higher, it is difficult to disperse evenly in the resin when used alone, resulting in poor processing performance of the material

Method used

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  • Preparation method of magnesium-hydroxide-coated calcium carbonate inorganic composite flame retardant filler
  • Preparation method of magnesium-hydroxide-coated calcium carbonate inorganic composite flame retardant filler

Examples

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Effect test

Embodiment 1

[0020] Get 200g magnesium sulfate and put into stirring reactor, add 1000ml water wherein, configure magnesium sulfate solution; Add ground calcium carbonate (D 97 =5μm) 400g, after stirring evenly, make a mixed slurry; slowly add 130g of calcium hydroxide to the mixed slurry at a constant temperature of 90°C while stirring; after stirring for 150min, the reaction product is filtered, washed, dried, and depolymerized. Then it is modified by dry method with 10g of silane and 5g of stearic acid to obtain magnesium hydroxide-coated calcium carbonate inorganic composite flame-retardant filler.

Embodiment 2

[0022] Get 200g magnesium sulfate and put into stirring reactor, add 1300ml water wherein, configure magnesium sulfate solution, add heavy calcium carbonate (D 97 =10μm) 600g, after stirring evenly, to make a mixed slurry; slowly add 140g of calcium hydroxide to the mixed slurry at a constant temperature of 75°C while stirring, and after stirring for 120min, the reaction product is filtered, washed, dried, and depolymerized. Then, 11 g of silane and 6 g of stearic acid are used for dry modification to obtain magnesium hydroxide-coated calcium carbonate inorganic composite flame-retardant filler.

Embodiment 3

[0024] Get 200g magnesium sulfate and put into stirring reactor, add 1200ml water wherein, configure magnesium sulfate solution, add light calcium carbonate (D 97 =15μm) 500g, after stirring evenly, to make a mixed slurry; slowly add 130g of calcium hydroxide to the mixed slurry at a constant temperature of 70°C while stirring, and after stirring for 90min, the reaction product is filtered, washed, dried, and depolymerized. Then it is modified by dry method with 10g of silane and 5g of stearic acid to obtain magnesium hydroxide-coated calcium carbonate inorganic composite flame-retardant filler.

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Abstract

The invention relates to a preparation method of magnesium-hydroxide-coated calcium carbonate inorganic composite flame retardant filler. The preparation method comprises the following steps: adding water to calcium carbonate powder and magnesium sulfate so as to prepare slurry, adding calcium hydroxide to the slurry at a certain temperature, stirring, reacting for a certain time, then filtering, washing, drying, depolymerizing, and carrying out surface modification, thus obtaining the magnesium-hydroxide-coated calcium carbonate inorganic composite flame retardant filler. The inorganic composite flame retardant filler prepared by using the method has the excellent flame retardant property and smoke suppression property of magnesium hydroxide, also has the excellent filling technological property of calcium carbonate and the enhanced mechanical property and auxiliary flame retardant and smoke abatement property of calcium sulphate dehydrate, integrates multiple functions of filling enhancement, flame retardancy, smoke abatement and the like; the production cost of a magnesium hydroxide flame retardant is reduced, the functions of the calcium carbonate filler are added; and the magnesium-hydroxide-coated calcium carbonate inorganic composite flame retardant filler has good application prospect.

Description

technical field [0001] The invention relates to a preparation method of magnesium hydroxide-coated calcium carbonate inorganic composite flame-retardant filler, which belongs to the technical field of inorganic flame-retardant fillers. Background technique [0002] Calcium carbonate powder materials including heavy or finely ground calcium carbonate and light or precipitated calcium carbonate are widely used in plastics, Inorganic mineral fillers with the widest application and the largest consumption in the polymer material industry such as rubber, adhesives, and cable insulation materials. However, although the calcium carbonate filler has the function of flame retardancy, it does not have the function of flame retardancy. Therefore, in today's society where the requirements for the safe use of materials are getting higher and higher, it is urgently hoped that calcium carbonate, as the most widely used inorganic non-metallic mineral filler, can have a certain The flame r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/06C09C3/12C09C3/08C08K9/10C08K9/06C08K9/04C08K3/26C08K3/30C08K3/22
Inventor 郑水林刘超宋贝刘姝抒
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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