CN1222475C - Preparing method for superfine highly dispersed magnesium hydroxide - Google Patents
Preparing method for superfine highly dispersed magnesium hydroxide Download PDFInfo
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- CN1222475C CN1222475C CN 200310105628 CN200310105628A CN1222475C CN 1222475 C CN1222475 C CN 1222475C CN 200310105628 CN200310105628 CN 200310105628 CN 200310105628 A CN200310105628 A CN 200310105628A CN 1222475 C CN1222475 C CN 1222475C
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Abstract
The present invention relates to a method for preparing ultrathin highly-dispersed magnesium hydroxide, which comprises the following steps: using bittern or water solutions of inorganic water-solubility magnesium salt as raw materials, adding premixing precipitating agents and modifying agents under the state of stirring, carrying out reaction for 10 to 60 minutes at 20 to 90 DEG C, and filtering, washing and drying reaction liquor so as to obtain finished products. Because the present invention uses sodium salt, or potassium salt or amine salt of saturated fatty acid as the modifying agents, the present invention has the advantages of good dispersivity of prepared magnesium hydroxide products, higher processing temperature and high production efficiency, and the magnesium hydroxide products can be dried at temperature of more than 120 DEG C. By using the method, the present invention can obtain ultrathin highly-dispersed magnesium hydroxide products without lapping grinding, product grain diameter is in a scope ranging from 0.4 to 1 micron, and the magnesium hydroxide products can be directly used for fire retardant of products, such as plastic, rubber, building materials, electric wires, cables, etc. Thus, the present invention reduces production process steps, and is convenient for users.
Description
Technical field
The present invention relates to a kind of preparation method of magnesium hydroxide, the preparation method of a kind of ultra-fine high dispersing magnesium hydrate of more specifically saying so.
Background technology
Fire retardant is divided into organic fire-retardant and inorganic combustion inhibitor, because organic fire-retardant can produce a large amount of toxic gases when burning, therefore, is substituted by inorganic combustion inhibitor gradually.Magnesium hydroxide belongs to the addition type inorganic combustion inhibitor, compares with similar inorganic combustion inhibitor, and magnesium hydroxide has better smoke suppressing effect, higher heat decomposition temperature, has obtained widespread use in field of compound material.
Magnesium hydroxide has multiple traditional preparation method, but with the magnesium hydroxide products that these traditional preparation methods make, generally has big, the easy reunion of particle, difficult dispersive defective, influences the processing characteristics and the use properties of matrix material.Chinese patent application number is in 00135436.1 the application documents, having introduced a kind of is the method that properties-correcting agent prepares needle-like or laminar magnesium hydroxide with sodium oleate or potassium oleate, the weak point of this method is: 1, because the easy oxygenolysis of employed properties-correcting agent high temperature, the precipitation paste of gained can only not be higher than under 70 ℃ the lesser temps dry in temperature in process of production, therefore, production efficiency is low, can not embody the high characteristic of magnesium hydroxide heat decomposition temperature, limit the application in matrix material; 2, the magnesium hydroxide that uses this method to make, still needing to grind just can reach is used for the dimensional requirement that fire retardant uses, and has increased production cost.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of ultra-fine high dispersing magnesium hydrate that has higher processing temperature, can be directly uses as fire retardant.
In order to realize purpose of the present invention, the preparation method of this ultra-fine high dispersing magnesium hydrate, be that the aqueous solution with bittern or inorganic water-soluble magnesium salt is raw material, under whipped state, add precipitation agent and the properties-correcting agent that is pre-mixed, it in temperature reaction 10-60 minute under 20 ℃-900 ℃ the condition, with reacting liquid filtering, washing, drying, get product again.
The bittern that the present invention uses or the concentration of inorganic water-soluble magnesium salt are 5-40% (wt).
The precipitation agent that the present invention uses is ammoniacal liquor, aqueous sodium hydroxide solution, potassium hydroxide aqueous solution or calcium hydroxide aqueous solution, and concentration is 5-40% (wt).
More than or equal to 6 saturated fatty acid sodium-salt, sylvite or amine salt, the saturated fatty acid sodium-salt comprises that Sodium n-caproate, Sodium octoate, isocaprylic acid are received to the properties-correcting agent that the present invention uses as carbon containing in the molecule, hexanodioic acid sodium, sebacic acid sodium or sodium stearate; The saturated fatty acid potassium salt comprises caproic acid potassium, potassium octanoate, isocaprylic acid potassium, Potassium Adipate, sebacic acid potassium or potassium stearate; Saturated fatty acid sodium-salt preferably, the best is a sodium stearate.The properties-correcting agent add-on is the theoretical 0.1-10% that generates magnesium hydroxide weight.
Because to adopt saturated fatty acid sodium-salt, sylvite or amine salt is properties-correcting agent in the present invention, the magnesium hydroxide products good dispersity of preparation has higher processing temperature, can be higher than under 120 ℃ the temperature dryly, has improved production efficiency; Utilize method of the present invention, do not need can obtain the ultra-fine high dispersing magnesium hydrate product through grinding, product cut size is the 0.4-1 micron, can directly be used as the fire retardant of products such as plastics, rubber, building materials, electric wire, reduce production process, made things convenient for the user.
The present invention adopts following method to measure the magnesium hydroxide particle diameter: take by weighing 0.1 gram magnesium hydroxide powder and put into 100 milliliter of 0.3% sodium hexametaphosphate solution, after the ultrasonic dispersing 5 minutes, measure median size with SA-CP3 type laser particle analyzer (day island proper Tianjin company product).
The present invention adopts following method to estimate the magnesium hydroxide dispersiveness: take by weighing 10 gram magnesium hydroxide powders and put into 500 ml beakers, add 3000 ml waters, stir and leave standstill one hour after one minute, if magnesium hydroxide powder does not sink, show the magnesium hydroxide good dispersity.
Embodiment
Example 1
Getting 100 gram concentration is 10% (wt) bittern and 1 gram sodium stearate, after this sodium stearate and concentration is 25% (wt) ammoniacal liquor thorough mixing, be added drop-wise in the bittern under the whipped state, it in temperature reaction 30 minutes under 20 ℃-25 ℃ the condition, the pH value that makes reaction residual liquor is 9, reactant is filtered, washs, and the gained paste is dry under 120 ℃ of conditions in temperature, obtains white magnesium hydroxide powder.This magnesium hydroxide powder median size is 0.62 micron, puts into the water stirring and leaves standstill one hour after one minute, does not sink.
Example 2
Getting 100 gram concentration is 35% (wt) bittern and 4 gram sodium stearate, after this sodium stearate and concentration is 25% (wt) ammoniacal liquor thorough mixing, be added drop-wise in the bittern under the whipped state, it in temperature reaction 30 minutes under 20 ℃-25 ℃ the condition, the pH value that makes reaction residual liquor is 8.5, reactant is filtered, washs, and the gained paste is dry under 120 ℃ of conditions in temperature, obtains white magnesium hydroxide powder.This magnesium hydroxide powder median size is 0.58 micron, puts into the water stirring and leaves standstill one hour after one minute, does not sink.
Example 3
Getting 100 gram concentration is 10% (wt) magnesium sulfate solution and 0.5 gram sodium stearate, after this sodium stearate and concentration is 15% (wt) aqueous sodium hydroxide solution thorough mixing, be added drop-wise in the magnesium sulfate solution under the whipped state, it in temperature reaction 50 minutes under 40 ℃-50 ℃ the condition, make the pH value of reaction residual liquor be 8-9, reactant is filtered, washs, and the gained paste is dry under 120 ℃ of conditions in temperature, obtains white magnesium hydroxide powder.This magnesium hydroxide powder median size is 0.60 micron, puts into the water stirring and leaves standstill one hour after one minute, does not sink.
Example 4
Getting 100 gram concentration is 10% (wt) bittern and 1 gram potassium stearate, after this potassium stearate and concentration is 25% (wt) potassium hydroxide aqueous solution thorough mixing, be added drop-wise in the bittern under the whipped state, it in temperature reaction 30 minutes under 20 ℃-25 ℃ the condition, make the pH value of reaction residual liquor be 8-9, reactant is filtered, washs, and the gained paste is dry under 120 ℃ of conditions in temperature, obtains white magnesium hydroxide powder.This magnesium hydroxide powder median size is 0.62 micron, puts into the water stirring and leaves standstill one hour after one minute, does not sink.
Example 5
Getting 100 gram concentration is 30% (wt) magnesium chloride brine and 3 gram sebacic acid sodium, after this sebacic acid sodium and concentration is 15% (wt) calcium hydroxide aqueous solution thorough mixing, be added drop-wise in the magnesium chloride brine under the whipped state, it in temperature reaction 60 minutes under 80 ℃-85 ℃ the condition, make the pH value of reaction residual liquor be 8-9, reactant is filtered, washs, and the gained paste is dry under 120 ℃ of conditions in temperature, obtains white magnesium hydroxide powder.This magnesium hydroxide powder median size is 0.72 micron, puts into the water stirring and leaves standstill one hour after one minute, does not sink.
Claims (6)
1, a kind of preparation method of ultra-fine high dispersing magnesium hydrate, it is characterized in that the aqueous solution with bittern or inorganic water-soluble magnesium salt is raw material, under whipped state, add precipitation agent and the properties-correcting agent that is pre-mixed, it in temperature reaction 10-60 minute under 20 ℃-90 ℃ the condition, again with reacting liquid filtering, washing, drying, get product, described properties-correcting agent is that carbon containing is more than or equal to 6 saturated fatty acid sodium-salt, sylvite or amine salt in the molecule, and the properties-correcting agent add-on is the theoretical 0.1-10% that generates magnesium hydroxide weight.
2, the preparation method of ultra-fine high dispersing magnesium hydrate according to claim 1, the concentration that it is characterized in that bittern or inorganic water-soluble magnesium salt are 5-40% (wt).
3, the preparation method of ultra-fine high dispersing magnesium hydrate according to claim 1 is characterized in that precipitation agent is ammoniacal liquor, aqueous sodium hydroxide solution, potassium hydroxide aqueous solution or calcium hydroxide aqueous solution, and concentration is 5-40% (wt).
4, the preparation method of ultra-fine high dispersing magnesium hydrate according to claim 1 is characterized in that the saturated fatty acid sodium-salt comprises that Sodium n-caproate, Sodium octoate, isocaprylic acid are received, hexanodioic acid sodium, sebacic acid sodium or sodium stearate.
5, the preparation method of ultra-fine high dispersing magnesium hydrate according to claim 1 is characterized in that the saturated fatty acid potassium salt comprises caproic acid potassium, potassium octanoate, isocaprylic acid potassium, Potassium Adipate, sebacic acid potassium or potassium stearate.
6, the preparation method of ultra-fine high dispersing magnesium hydrate according to claim 4 is characterized in that the saturated fatty acid sodium-salt is a sodium stearate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310105628 CN1222475C (en) | 2003-11-08 | 2003-11-08 | Preparing method for superfine highly dispersed magnesium hydroxide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200310105628 CN1222475C (en) | 2003-11-08 | 2003-11-08 | Preparing method for superfine highly dispersed magnesium hydroxide |
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| CN1541943A CN1541943A (en) | 2004-11-03 |
| CN1222475C true CN1222475C (en) | 2005-10-12 |
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| CN 200310105628 Expired - Fee Related CN1222475C (en) | 2003-11-08 | 2003-11-08 | Preparing method for superfine highly dispersed magnesium hydroxide |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357394C (en) * | 2006-05-29 | 2007-12-26 | 太原理工大学 | Preparation method of hydrophobic ultrafine nanometer fire retardant magnesium hydroxide |
| CN100465247C (en) * | 2007-01-31 | 2009-03-04 | 中北大学 | Method of preparing high-purity high-dispersion magnesium hydroxide fire retardant |
| CN101173115B (en) * | 2007-10-27 | 2010-06-02 | 太原理工大学 | Ultra-fine magnesium hydroxide surface modifying method |
| CN101850994B (en) * | 2010-06-28 | 2013-11-06 | 青海大通辰光硼业有限公司 | Method for preparing flame-retardant grade magnesium hydroxide |
| CN103408044B (en) * | 2013-08-06 | 2015-07-08 | 江苏大学 | Preparation method for nano magnesia solid alkali based on doped lignosite |
| CN105060319A (en) * | 2015-07-23 | 2015-11-18 | 韦海棉 | Method for preparing highly-dispersed magnesium hydroxide by magnesium salt |
| CN113979455A (en) * | 2021-11-10 | 2022-01-28 | 大连交通大学 | Preparation method and application of flaky superfine magnesium hydroxide |
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2003
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Granted publication date: 20051012 Termination date: 20091208 |