Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparing method for superfine highly dispersed magnesium hydroxide

A magnesium hydroxide and dispersion technology, applied in magnesium hydroxide and other directions, can solve the problems of limited application, low production efficiency, difficult dispersion, etc., and achieve the effects of reducing production processes, improving production efficiency, and high processing temperature

Inactive Publication Date: 2005-10-12
SHANDONG HAIHUA GRP CO LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many traditional preparation methods for magnesium hydroxide, but the magnesium hydroxide products prepared by these traditional preparation methods generally have the defects of large particles, easy agglomeration, and difficult dispersion, which affect the processing performance and use performance of composite materials
Chinese patent application number is in the application document of 00135436.1, has introduced a kind of method with sodium oleate or potassium oleate as modifying agent to prepare acicular or flake magnesium hydroxide, the weak point of this method is: 1, because The modifier used is easy to oxidize and decompose at high temperature, and the precipitated paste obtained in the production process can only be dried at a lower temperature not higher than 70°C. Therefore, the production efficiency is low, and the heat of magnesium hydroxide cannot be reflected. The characteristics of high decomposition temperature limit the application in composite materials; 2. The magnesium hydroxide prepared by this method still needs to be ground to meet the size requirements for flame retardants, which increases the production cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Get 100 gram concentration and be 10% (wt) bittern and 1 gram sodium stearate, after this sodium stearate and concentration are 25% (wt) ammoniacal liquor fully mixed, be added dropwise in the bittern under stirring state, React at a temperature of 20°C-25°C for 30 minutes to make the pH of the reaction solution 9, filter and wash the reactant, and dry the resulting paste at a temperature of 120°C to obtain white magnesium hydroxide powder. The average particle size of the magnesium hydroxide powder is 0.62 micron, it is put into water and stirred for one minute and then left to stand for one hour without sinking.

example 2

[0015] Get 100 gram concentrations and be 35% (wt) bittern and 4 gram sodium stearates, after this sodium stearate and concentration are 25% (wt) ammoniacal liquor fully mixed, be added dropwise in the bittern under stirring state, React at a temperature of 20°C-25°C for 30 minutes to make the pH of the reaction solution 8.5, filter and wash the reactant, and dry the resulting paste at a temperature of 120°C to obtain white magnesium hydroxide powder. The average particle size of the magnesium hydroxide powder is 0.58 micron, it is put into water and stirred for one minute and then left to stand for one hour without sinking.

example 3

[0017] Get 100 gram concentration and be 10% (wt) magnesium sulfate aqueous solution and 0.5 gram sodium stearate, after this sodium stearate and concentration are 15% (wt) sodium hydroxide aqueous solution fully mix, add dropwise to already in stirring state In the magnesium sulfate aqueous solution under the temperature of 40°C-50°C, react for 50 minutes, make the pH value of the reaction completion liquid be 8-9, filter and wash the reactant, and the obtained paste is heated at a temperature of 120°C Dry under conditions to obtain white magnesium hydroxide powder. The average particle size of the magnesium hydroxide powder is 0.60 micron, and it is put into water and stirred for one minute and then left to stand for one hour without sinking.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The preparation process of superfine high dispersivity magnesium hydroxide includes adding pre-mixed precipitant and modifier into the mixture of bittern and magnesium slat aqua as main material via stirring, reaction at 20-90 deg.c for 10-60 min, filtering the reacted liquid, washing, and drying to obtain the product. Owing to the modifier of sodium, potassium or ammonium salt of saturated fatty acid, the magnesium hydroxide product has high dispersivity, high processing temperature, drying temperature up to 120 deg.c and high production efficiency. The said process can obtain superfine magnesium hydroxide product of 0.4-1 micron, and the product may be used directly as fire retardant for plastic, rubber, building material, etc.

Description

technical field [0001] The invention relates to a preparation method of magnesium hydroxide, more specifically a preparation method of ultrafine highly dispersed magnesium hydroxide. Background technique [0002] Flame retardants are divided into organic flame retardants and inorganic flame retardants. Since organic flame retardants produce a large amount of toxic gases when burned, they are gradually replaced by inorganic flame retardants. Magnesium hydroxide is an additive inorganic flame retardant. Compared with similar inorganic flame retardants, magnesium hydroxide has better smoke suppression effect and higher thermal decomposition temperature, and has been widely used in the field of composite materials. [0003] Magnesium hydroxide has a variety of traditional preparation methods, but the magnesium hydroxide products prepared by these traditional preparation methods generally have the defects of large particles, easy agglomeration, and difficult dispersion, which aff...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/14C01F5/20
Inventor 郝在晨梁金龙赵光年杨文全张军冯瑞祯
Owner SHANDONG HAIHUA GRP CO LTD