CN103663509A - Preparation method of magnesium hydroxide - Google Patents
Preparation method of magnesium hydroxide Download PDFInfo
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- CN103663509A CN103663509A CN201210346886.6A CN201210346886A CN103663509A CN 103663509 A CN103663509 A CN 103663509A CN 201210346886 A CN201210346886 A CN 201210346886A CN 103663509 A CN103663509 A CN 103663509A
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- magnesium hydroxide
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- magnesium
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Abstract
The invention provides a preparation method of magnesium hydroxide with high flame retardance efficiency and strong surface activity. The preparation method is simple in process and comprises the following steps: 1) adding a sodium hydroxide aqueous solution to a magnesium sulfate aqueous solution; 2) stirring the mixed solution for 10-60 minutes; 3) adding sorbitan oleate to the stirred mixed solution; 4) putting the mixed solution in the step 3 into a high-pressure reactor and preserving heat at 220 DEG C for 8 hours, wherein the stirring speed is 180r/min; 5) after cooling, filtering the mixed solution with a high-pressure automatic diaphragm filter press and washing with deionized water; and 6) drying and grinding to obtain the magnesium hydroxide. The preparation method has the beneficial effects that the magnesium hydroxide prepared by the preparation method is relatively high in purity and relatively fine in particles; the surface activity of the magnesium hydroxide is greatly improved and the dispersibility of magnesium hydroxide powder in polymer materials is improved, so that the magnesium hydroxide is applied more widely; the preparation method is simple in process and the cost is saved.
Description
Technical field
The present invention relates to chemical field, relate in particular to a kind of magnesium hydroxide preparation method.
Background technology
Magnesium hydroxide is as fire retardant, be widely used in the macromolecular materials such as rubber, chemical industry, building materials, plastics (polypropylene, polyethylene, polyvinyl chloride, terpolymer EP rubber) and electronics, unsaturated polyester and paint, coating, particularly to mining air duct coating cloth, the whole core travelling belt of PVC, fire-retardant offset plate, paulin, PVC wire cable material, mine cable sheath, cable accessory fire-retardant, eliminate smoke antistatic, can replace aluminium hydroxide, there is good flame retardant effect.
Magnesium hydroxide is as fire retardant, because it is fire-retardant, nontoxic, press down cigarette, thermostability high causes people's concern day by day.But there is following shortcoming as fire retardant in prior art magnesium hydroxide: the one, and flame retarding efficiency is low, the addition of having relatively high expectations; The 2nd, the character on its surface natural presenting " hydrophilic oleophobic ", has a strong impact on its mechanical property during filled polymer material.Therefore, improve magnesium hydrate powder Study on dispersity in polymer materials and seem particularly important.
Summary of the invention
The present invention is directed to the problems referred to above, to have proposed flame retarding efficiency high, and surfactivity is strong, a kind of simple magnesium hydroxide preparation method of technique.
Technical solution of the present invention is: comprise the following steps:
1), get magnesium sulfate solution, add aqueous sodium hydroxide solution;
2), stir above-mentioned mixed solution, churning time 10-60min;
3), mixed solution after stirring is added to sorbitol anhydride oleate;
4), mixed solution in step 3 is inserted to autoclave, 220 ℃ of temperature, insulation 8h, stirring velocity is 180r/min;
5), cooling after, by high pressure automatic diaphragm Filter Press, use deionized water washing;
6), drying and crushing, can obtain magnesium hydroxide finished product.
In described magnesium sulfate solution, magnesium sulfate content is 5-20g/l, and in described aqueous sodium hydroxide solution, sodium hydroxide is 7-25g/l, and described magnesium sulfate solution and described aqueous sodium hydroxide solution volume ratio are 1:1.
Sorbitol anhydride oleate content described in described mixed solution is 0.03-1.2g/l.
It is higher that the present invention prepares magnesium hydroxide purity by magnesium sulfate solution and sodium hydroxide solution, particle is thinner, in preparation process, add tensio-active agent sorbitol anhydride oleate simultaneously, at the temperature of 22 ℃, react, greatly improved the surfactivity of magnesium hydroxide, improve magnesium hydrate powder dispersed in polymer materials, make magnesium hydroxide application more extensive, and technique is fairly simple, cost-saving.
Embodiment
Embodiment mono-
The first, the magnesium sulfate solution of getting 5g/l adds the aqueous sodium hydroxide solution of the 7g/l of same volume;
The second, by above-mentioned mixed solution, churning time 10min;
Three, mixed solution after stirring is added to sorbitol anhydride oleate, making sorbitol anhydride oleate content in mixed solution is 0.03g/l.
Four, mixed solution in third step is inserted to autoclave, 220 ℃ of temperature, insulation 8h, stirring velocity is 180r/min;
Five, mixed solution in step 4 is cooling, by high pressure automatic diaphragm Filter Press, use deionized water washing;
Six, dry rear and pulverizing, can obtain magnesium hydroxide finished product.
Embodiment bis-
The first, the magnesium sulfate solution of getting 20g/l adds the aqueous sodium hydroxide solution of the 25g/l of same volume;
The second, by above-mentioned mixed solution, churning time 60min;
Three, mixed solution after stirring is added to sorbitol anhydride oleate, making sorbitol anhydride oleate content in mixed solution is 1.2g/l.
Four, mixed solution in third step is inserted to autoclave, 220 ℃ of temperature, insulation 8h, stirring velocity is 180r/min;
Five, mixed solution in step 4 is cooling, by high pressure automatic diaphragm Filter Press, use deionized water washing;
Six, dry rear and pulverizing, can obtain magnesium hydroxide finished product.
Embodiment tri-
The first, the magnesium sulfate solution of getting 15g/l adds the aqueous sodium hydroxide solution of the 18g/l of same volume;
The second, by above-mentioned mixed solution, churning time 10min;
Three, mixed solution after stirring is added to sorbitol anhydride oleate, making sorbitol anhydride oleate content in mixed solution is 0.09g/l.
Four, mixed solution in third step is inserted to autoclave, 220 ℃ of temperature, insulation 8h, stirring velocity is 180r/min;
Five, mixed solution in step 4 is cooling, by high pressure automatic diaphragm Filter Press, use deionized water washing;
Six, dry rear and pulverizing, can obtain magnesium hydroxide finished product.
It is higher that the present invention prepares magnesium hydroxide purity by magnesium sulfate solution and sodium hydroxide solution, particle is thinner, in preparation process, add tensio-active agent sorbitol anhydride oleate simultaneously, at the temperature of 220 ℃, react, greatly improved the surfactivity of magnesium hydroxide, improve magnesium hydrate powder dispersed in polymer materials, make magnesium hydroxide application more extensive, and technique is fairly simple, cost-saving.
Claims (3)
1. a magnesium hydroxide preparation method, is characterized in that, comprises the following steps:
1), get magnesium sulfate solution, add aqueous sodium hydroxide solution;
2), stir above-mentioned mixed solution, churning time 10-60min;
3), mixed solution after stirring is added to sorbitol anhydride oleate;
4), mixed solution in step 3 is inserted to autoclave, 220 ℃ of temperature, insulation 8h, stirring velocity is 180r/min;
5), cooling after, by high pressure automatic diaphragm Filter Press, use deionized water washing;
6), drying and crushing, can obtain magnesium hydroxide finished product.
2. a kind of magnesium hydroxide preparation method according to claim 1, it is characterized in that, in described magnesium sulfate solution, magnesium sulfate content is 5-20g/l, and in described aqueous sodium hydroxide solution, sodium hydroxide is 7-25g/l, and described magnesium sulfate solution and described aqueous sodium hydroxide solution volume ratio are 1:1.
3. a kind of magnesium hydroxide preparation method according to claim 1, is characterized in that, sorbitol anhydride oleate content described in described mixed solution is 0.03-1.2g/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210346886.6A CN103663509A (en) | 2012-09-19 | 2012-09-19 | Preparation method of magnesium hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210346886.6A CN103663509A (en) | 2012-09-19 | 2012-09-19 | Preparation method of magnesium hydroxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103663509A true CN103663509A (en) | 2014-03-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210346886.6A Pending CN103663509A (en) | 2012-09-19 | 2012-09-19 | Preparation method of magnesium hydroxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103663509A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104386718A (en) * | 2014-11-03 | 2015-03-04 | 苏州市泽镁新材料科技有限公司 | Method for preparing magnesium hydrate |
| CN104445303A (en) * | 2014-11-03 | 2015-03-25 | 苏州市泽镁新材料科技有限公司 | Preparation method of magnesium hydrate |
-
2012
- 2012-09-19 CN CN201210346886.6A patent/CN103663509A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104386718A (en) * | 2014-11-03 | 2015-03-04 | 苏州市泽镁新材料科技有限公司 | Method for preparing magnesium hydrate |
| CN104445303A (en) * | 2014-11-03 | 2015-03-25 | 苏州市泽镁新材料科技有限公司 | Preparation method of magnesium hydrate |
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Application publication date: 20140326 |