CN1285510C - Prepn process of nano aluminium hydroxide - Google Patents
Prepn process of nano aluminium hydroxide Download PDFInfo
- Publication number
- CN1285510C CN1285510C CN 200410067540 CN200410067540A CN1285510C CN 1285510 C CN1285510 C CN 1285510C CN 200410067540 CN200410067540 CN 200410067540 CN 200410067540 A CN200410067540 A CN 200410067540A CN 1285510 C CN1285510 C CN 1285510C
- Authority
- CN
- China
- Prior art keywords
- solution
- aluminum hydroxide
- aluminium hydroxide
- filter cake
- azeotropic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910021502 aluminium hydroxide Inorganic materials 0.000 title abstract description 9
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000000243 solution Substances 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000012065 filter cake Substances 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000012670 alkaline solution Substances 0.000 claims abstract description 11
- 239000000084 colloidal system Substances 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- 238000010533 azeotropic distillation Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000000725 suspension Substances 0.000 claims abstract description 8
- 230000032683 aging Effects 0.000 claims abstract description 7
- 238000001556 precipitation Methods 0.000 claims abstract description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 6
- 239000003223 protective agent Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 12
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000004945 emulsification Methods 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 238000004821 distillation Methods 0.000 claims description 4
- 238000004537 pulping Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims 1
- 239000000047 product Substances 0.000 abstract description 7
- 229910000329 aluminium sulfate Inorganic materials 0.000 abstract description 5
- 238000011049 filling Methods 0.000 abstract description 3
- 238000000967 suction filtration Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 150000002484 inorganic compounds Chemical class 0.000 abstract description 2
- 229910010272 inorganic material Inorganic materials 0.000 abstract description 2
- 238000001308 synthesis method Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 2
- 159000000013 aluminium salts Chemical class 0.000 abstract 1
- 239000003995 emulsifying agent Substances 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 229920002521 macromolecule Polymers 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000012266 salt solution Substances 0.000 abstract 1
- 239000003063 flame retardant Substances 0.000 description 15
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 5
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000002861 polymer material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000026030 halogenation Effects 0.000 description 1
- 238000005658 halogenation reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to a preparation method of nanometer aluminium hydroxide, which belongs to the technical field of preparation technology of inorganic compounds. The method of the present invention mainly comprises a homogeneous precipitation synthesis method and a non-homogeneous precipitation azeotropic distillation method. The method of the present invention is characterized in that an aluminium salt solution and an alkaline solution are used as raw materials, a small amount of macromolecule protective agent, such as polyethyleneglycol or polyvinyl alcohol, is added to the raw materials; a homogeneous precipitation reaction is carried out in a homogeneous emulsifier, and the stirring speed is regulated according to the needed particle diameters of the product to obtain an aluminium hydroxide suspension; the obtained aluminium hydroxide suspension is treated by cooling, aging, suction filtration and washing to obtain a filter cake; the filter cake is added to a solution of a normal butyl alcohol azeotropic solvent, and an azeotropic distillation reaction is carried out to the mixture filter cake and the solution to obtain aluminium hydroxide colloid; finally, the obtained aluminium hydroxide colloid is dried to obtain nanometer aluminium hydroxide powder. The method of the present invention has simple technical process and easy operation. The product of the present invention has uniform particle size distribution and high purity, and the particle diameters of the product are from 25 nm to 100 nm; moreover, the prepared nanometer aluminium hydroxide has favourable flame retardancy and filling performance.
Description
Technical Field
The invention relates to a preparation method of nano aluminum hydroxide, belonging to the technical field of preparation processes of inorganic compounds.
Background
With the further development of science and technology, the living standard of people is improved, and the plastic processed products and organic polymer materials of chemical building materials are more and more widely used in the fields of buildings, traffic, electrical appliances, communication and the like. The fire hazard caused by the inherent flammability of these materials has become a social problem of global concern, and at present, the flammability of the polymer is reduced mainly by adding a flame retardant to slow down the combustion speed of the polymer.
Among various flame retardant varieties, the halogen flame retardant is widely applied due to good flame retardant effect and no influence on the physical and chemical properties of materials. However, the polymer added with the halogen flame retardant has a large amount of smoke during combustion, and easily emits corrosive gases (such as HCl, HBr and the like) and harmful gases, thereby easily causing secondary damage. Therefore, the research on flame retardants in the world is moving toward non-halogenation. The aluminum hydroxide fire retardant, namely the alumina trihydrate, accounts for more than 80 percent of the inorganic fire retardant, can be used as a filler and a fire retardant in plastics, has triple functions of filling, fire retarding and smoke suppression, and has the advantages of no toxicity, no corrosion and strong price competitiveness. Is praised as a pollution-free flame retardant abroad. The temperature of the dehydration reaction of the aluminum hydroxide is 300-350 ℃, when the aluminum hydroxide is heated, the aluminum hydroxide releases crystal water and absorbs a large amount of heat, so that the temperature rise of the polymer material is inhibited, the thermal decomposition of the polymer material is delayed, the combustion speed is reduced, and the generated water vapor can dilute the combustible gas; the alumina produced by dehydration forms a coating layer which limits combustion, cuts off oxygen supply and prevents the flow of combustible gas, thus playing a role of flame retardance.
But the flame retardant efficiency of the aluminum hydroxide is low, the higher addition amount is required, and when the common aluminum hydroxide reaches the flame retardant share, the particle size is large, the interface bonding force is small, and the uniform dispersion in the polymer is difficult, so that the mechanical property of the polymer material is greatly reduced; the nanometer aluminum hydroxide has small particle size and large specific surface area, enhances the interaction with the matrix material, can be more uniformly dispersed in the matrix material, and can effectively improve the mechanical property of the matrix material while exerting the flame retardant effect. Therefore, the ultrafine formation of the aluminum hydroxide powder is a future development direction.
In recent years, a great deal of research work is done on the aspects of preparation and application of superfine or nano aluminum hydroxide flame retardants at home and abroad. In US4492682 and US3268295, it is proposed to use the carbolysis method to inject carbon dioxide gas into a sodium aluminate solution under vigorous stirring to obtain a gel, which is then washed, filtered and then redispersed in another solution for heat treatment to obtain ultrafine aluminium hydroxide with an average particle size of less than 10 nm. However, the method has long decomposition time of carbon, and when the volume of the solution is only 0.5 liter, the decomposition process of carbon still needs 15 to 30 minutes, so that the efficiency is low, and the obtained gel is not uniform. Chinese patent CN1116185A discloses a method for directly preparing superfine aluminum hydroxide by a one-step method under the condition of a rotary bed high gravity field, and superfine aluminum hydroxide with the particle size of 25-100nm can be obtained. However, the aluminum hydroxide particles obtained by the method have uneven particle size distribution, complex process and higher industrial cost.
Disclosure of Invention
The invention aims to provide a preparation method of nano aluminum hydroxide, which has simple conditions, uniform particle size distribution and easily controlled particle size.
The invention relates to a preparation method of nano aluminum hydroxide, which comprises a homogeneous precipitation method synthesis method and a heterogeneous precipitation azeotropic distillation method, and is characterized by comprising the following specific process steps:
a. firstly, preparing an aluminum sulfate aqueous solution added with a high-molecular protective agent, wherein the high-molecular protective agent is any one of polyethylene glycol or polyvinyl alcohol; the adding amount of the aluminum sulfate is 1 to 3 percent of the mass of the aluminum sulfate;
b. placing the aluminum sulfate aqueous solution in a homogeneous emulsification reactor, heating, and stirring for 30 minutes at the rotating speed of 3000-7000 rpm;
c. slowly dripping alkaline solution into the reactor, continuously stirring, controlling the rotating speed at 3000-7000rpm, and controlling the reaction temperature at 25-45 ℃ to obtain an aluminum hydroxide suspension; the alkaline solution is any one of sodium hydroxide, ammonia water and ammonium carbonate;
d. cooling, aging and filtering the obtained aluminum hydroxide suspension, and washing the obtained filter cake with deionized water; in the process, the aging temperature is 20 ℃ and the time is 12 hours;
e. adding an azeotropic solution n-butyl alcohol solution into the obtained filter cake, stirring and pulping, then carrying out azeotropic distillation until the water is completely removed, and continuing distillation to evaporate the azeotropic solvent n-butyl alcohol; and drying the obtained colloid to finally obtain loose nano aluminum hydroxide particles.
The adding amount of the azeotropic solvent n-butanol in the azeotropic solution n-butanol solution is based on the mass of the aluminum hydroxide colloid filter cake, namely, 0.58 to 0.68 ml of azeotropic solvent n-butanol is added into each gram of the aluminum hydroxide colloid filter cake; the drying temperature of the obtained aluminum hydroxide colloid is 100-130 ℃, and the drying time is 6-12 hours.
The concentration of the aluminum sulfate solution is most suitable to be 1-2 mol/l; the alkaline solution is preferably sodium hydroxide solution, and the concentration of the alkaline solution is 0.5-1.0 mol/l.
In the method, the basic reaction formula for preparing the nano aluminum hydroxide is as follows:
in the method, the function of adding the macromolecular protective agent which is polyethylene glycol or polyvinyl alcohol is to prevent the nano aluminum hydroxide colloid particles from agglomerating. The n-butanol azeotropic solvent is used for the purpose of making the aluminum hydroxide particles easily smaller and uniform in particle size.
The method has the advantages of simple process flow, easy operation, low investment and low cost. The particle diameter of the prepared nano aluminum hydroxide is in the range of 25-100 nm. The product has uniform particle size distribution and high purity. In addition, the flame retardant and the filling performance of the product are far superior to those of other common aluminum hydroxide products.
Detailed description of the invention
The embodiments of the present invention will now be described in detail as follows:
example 1
34.2 g of Al2(SO4)3The solid was dissolved in 100 ml of deionized water to give 1mol/l Al2(SO4)3The solution was stirred for 30 minutes with 0.5 g of polyethylene glycol. Another 12 g NaOH was dissolved in 600 ml deionized water to form an alkaline solution of NaOH with a concentration of 0.5 mol/l. Adding the aluminum sulfate solution into a homogeneous emulsification reactor, slowly dropwise adding the prepared NaOHsolution while stirring, controlling the rotating speed of the stirrer to be 6000rpm, and controlling the reaction temperature to be 25 ℃ to obtain an aluminum hydroxide suspension; then cooling, aging at 20 ℃ for 12 hours, carrying out suction filtration, and washing the obtained filter cake with deionized water until no sulfate ions are detected; the filter cake and n-butanol azeotropic solution prepared in advance are prevented in a container together, and stirring and pulping are carried out; then, carrying out azeotropic distillation until the water is completely removed, and continuing distillation to evaporate the azeotropic solvent n-butanol; then drying the obtained colloid for 8 hours at 130 ℃ to finally obtain the aluminum hydroxide powder with the average grain diameter of 25 nm.
Example 2
The process of this example is the same as example 1 above. 34.2 g of Al2(SO4)3The solid is dissolved in 100 ml of deionized water to form a concentration of lmol/l Al2(SO4)3The solution was stirred for 30 minutes with 0.5 g of polyethylene glycol. Another 12 g NaOH was dissolved in 600 ml deionized water to form an alkaline solution of NaOH with a concentration of 0.5 mol/l. Adding the aluminum sulfate solution into a homogeneous emulsification reactor, slowly dropwise adding the prepared NaOH solution while stirring,controlling the rotating speed of the stirrer to be 3000rpm and the reaction temperature to be 45 ℃ to obtain an aluminum hydroxide suspension; then cooling, aging at 20 ℃ for 12 hours, carrying out suction filtration, and washing the obtained filter cake with deionized water until no sulfate ions are detected; putting the filter cake and a n-butanol azeotropic solution prepared in advance into a container together, and stirring and pulping; then, carrying out azeotropic distillation until the water is completely removed, and continuing distillation to evaporate the azeotropic solvent n-butanol; then drying the obtained colloid for 8 hours at 130 ℃ to finally obtain the aluminum hydroxide powder with the average grain diameter of 50 nm.
Example 3
The process of this example is the same as example 1 above. The difference is that when the materials react in the homogeneous emulsification reactor, the rotating speed of the stirrer is 7000rpm, the reaction temperature is controlled at 30 ℃, and finally the aluminum hydroxide powder with the average grain diameter of 30nm is obtained.
In the above examples, the amount of n-butanol as an azeotropic solvent in the n-butanol azeotropic solution is based on the mass of the aluminum hydroxide colloidal filter cake, that is, 0.61 ml of n-butanol as an azeotropic solvent is added per gram of the aluminum hydroxide colloidal filter cake.
Claims (3)
1. The preparation process of nanometer aluminum hydroxide includes homogeneous precipitation process synthesis and heterogeneous precipitation azeotropic distillation, and features the following steps:
a. firstly, preparing an aluminum sulfate aqueous solution added with a high-molecular protective agent, wherein the high-molecular protective agent is any one of polyethylene glycol or polyvinyl alcohol; the adding amount of the aluminum sulfate is 1 to 3 percent of the mass of the aluminum sulfate;
b. placing the aluminum sulfate aqueous solution in a homogeneous emulsification reactor, heating, and stirring for 30 minutes at the rotating speed of 3000-7000 rpm;
c. slowly dripping alkaline solution into the reactor, continuously stirring, controlling the rotating speed at 3000-7000rpm, and controlling the reaction temperature at 25-45 ℃ to obtain an aluminum hydroxide suspension; the alkaline solution is any one of sodium hydroxide, ammonia water and ammonium carbonate;
d. cooling, aging and filtering the obtained aluminum hydroxide suspension, and washing the obtained filter cake with deionized water; in the process, the aging temperature is 20 ℃ and the time is 12 hours;
e. adding an azeotropic solution n-butyl alcohol solution into the obtained filter cake, stirring and pulping, then carrying out azeotropic distillation until the water is completely removed, and continuing distillation to evaporate the azeotropic solvent n-butyl alcohol; and drying the obtained colloid to finally obtain loose nano aluminum hydroxide particles.
2. The method for preparing nano aluminum hydroxide according to claim 1, wherein the amount of n-butanol as an azeotropic solvent in the n-butanol solution of the azeotropic solution is based on the mass of the aluminum hydroxide colloidal filter cake, that is, 0.58 to 0.68 ml of n-butanol as an azeotropic solvent is added per gram of the aluminum hydroxide colloidal filter cake; the drying temperature of the obtained aluminum hydroxide colloid is 100-130 ℃, and the drying time is 6-12 hours.
3. The method for preparing nano aluminum hydroxide according to claim 1, wherein the concentration of the aluminum sulfate solution is 1-2 mol/l; the alkaline solution is sodium hydroxide solution, and the concentration of the alkaline solution is 0.5-1.0 mol/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067540 CN1285510C (en) | 2004-10-27 | 2004-10-27 | Prepn process of nano aluminium hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067540 CN1285510C (en) | 2004-10-27 | 2004-10-27 | Prepn process of nano aluminium hydroxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1608997A CN1608997A (en) | 2005-04-27 |
| CN1285510C true CN1285510C (en) | 2006-11-22 |
Family
ID=34765089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410067540 Expired - Lifetime CN1285510C (en) | 2004-10-27 | 2004-10-27 | Prepn process of nano aluminium hydroxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1285510C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502735A (en) * | 2011-11-03 | 2012-06-20 | 沈阳铝镁设计研究院有限公司 | Method for producing alumina by using pulverized fuel ash |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337922C (en) * | 2005-10-18 | 2007-09-19 | 浙江大学 | Method of preparing ultrafine aluminium hydroxide by coprecipitation sublimation |
| CN100411990C (en) * | 2006-01-23 | 2008-08-20 | 中国铝业股份有限公司 | Method for preparing aluminium hydroxide micropowder |
| CN1868885B (en) * | 2006-05-12 | 2010-07-21 | 广西民族大学 | Self-dispersion type nanometer gamma A100H and its preparation method and use |
| CN100427397C (en) * | 2006-09-05 | 2008-10-22 | 中国铝业股份有限公司 | Preparation method of flake ultrafine aluminium hydroxide |
| CN102101685B (en) * | 2009-12-16 | 2012-11-28 | 国家纳米科学中心 | Aluminium hydroxide nanometer strip and preparation method thereof |
| CN102120596B (en) * | 2010-01-08 | 2012-11-07 | 北京世纪地和科技有限公司 | Method for preparing aluminum hydroxide by utilizing precipitation method |
| CN103359763A (en) * | 2013-07-04 | 2013-10-23 | 鸿福晶体科技(安徽)有限公司 | Chemical preparation method for spherical hollow alumina powder for producing gemstone by using flame fusion method |
| CN103395809B (en) * | 2013-07-23 | 2017-03-01 | 宁波江东晟创工业产品设计有限公司 | One kind is using solvent displacement/azeotropic point distillation seasoning synthesis nanometer γ Al2O3Method and its application |
| CN103754913B (en) * | 2014-01-28 | 2016-08-17 | 复旦大学 | A kind of simple method for preparing of aluminum hydroxide nanoparticle material |
| CN104961146B (en) * | 2015-06-26 | 2017-04-12 | 吉林大学 | Nanometer sheet aluminum hydroxide gel and preparation method thereof |
| CN109534379A (en) * | 2019-01-09 | 2019-03-29 | 上海大学(浙江·嘉兴)新兴产业研究院 | A kind of nano-level sphere γ-Al2O3The low cost preparation method of powder |
| CN110092385B (en) * | 2019-04-01 | 2022-07-15 | 浙江工业大学之江学院 | Preparation method of magnesium aluminum silicate hydrogel |
| CN112110463A (en) * | 2019-06-19 | 2020-12-22 | 吉林大学 | Al (OH) based on aluminum-gallium-based alloy3Powder preparation method |
| CN110368327A (en) * | 2019-08-14 | 2019-10-25 | 广州益凡医疗器械有限公司 | A kind of plaque removes gel and preparation method thereof |
| CN111184860B (en) * | 2020-02-21 | 2022-05-06 | 中牧实业股份有限公司 | Improved aluminum hydroxide adjuvant and preparation method thereof |
| CN113735152B (en) * | 2020-05-29 | 2023-09-05 | 中国石油化工股份有限公司 | Method for removing entrained alcohol in aluminum hydroxide slurry |
| CN114735961B (en) * | 2022-02-23 | 2023-03-10 | 武汉源锦建材科技有限公司 | Solid-liquid dual-purpose alkali-free accelerator and preparation method and application thereof |
-
2004
- 2004-10-27 CN CN 200410067540 patent/CN1285510C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102502735A (en) * | 2011-11-03 | 2012-06-20 | 沈阳铝镁设计研究院有限公司 | Method for producing alumina by using pulverized fuel ash |
| CN102502735B (en) * | 2011-11-03 | 2014-05-21 | 沈阳铝镁设计研究院有限公司 | Method for producing alumina by using pulverized fuel ash |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1608997A (en) | 2005-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1285510C (en) | Prepn process of nano aluminium hydroxide | |
| CN112225985B (en) | Flame-retardant PP composite material and preparation method thereof | |
| CN101544783A (en) | Composite heat stabilizer for hydrophobic nano-hydrotalcite PVC and preparation method thereof | |
| CN108841043B (en) | Nano coating modified composite flame retardant for polyvinyl chloride material and preparation method thereof | |
| CN109517220B (en) | Preparation method of nano tin-based intumescent flame retardant | |
| CN1837043A (en) | Rare earth particle and montmorillonite nano composite materials and process for preparing same | |
| CN1128199C (en) | Preparation process of magnesium hydroxide fire-retarding nanomaterial | |
| CN110591156A (en) | Zirconium phosphate flame retardant modified based on graphitized carbon nitride composite intercalation and preparation method thereof | |
| CN108841042B (en) | Inorganic nano material and high-polymerization-degree ammonium polyphosphate compound flame retardant and preparation method thereof | |
| CN111019123B (en) | Method for flame-retardant modification of polyamide 56 by biomimetic modification of Lehm stone/graphene oxide nano composite material | |
| CN1241977C (en) | Method for manufacturing nanometer magnesium hydroxide fire retardant | |
| CN1304880A (en) | Process for preparing powdered zinc hydroxytannate | |
| CN110845779A (en) | Modified composite flame-retardant TPO resin and preparation method thereof | |
| CN109054450B (en) | Surface modified magnesium hydroxide and preparation method and application thereof | |
| CN109054099B (en) | Melamine modified lignin/magnesium aluminum hydroxide double-coated red phosphorus flame retardant and application thereof in cable material | |
| CN1389521A (en) | Prepn. and surface treatment of nanometer magnesium hydoxide as smoke-inhibiting fire retardant | |
| CN109054100B (en) | Melamine modified lignin/aluminum hydroxide double-coated red phosphorus flame retardant and application thereof in EVA resin | |
| CN1775664A (en) | Method for preparing microcapsulated superfine red phosphorus | |
| CN108912671B (en) | Melamine modified lignin/magnesium hydroxide double-coated red phosphorus flame retardant and application thereof in PA6 resin | |
| CN109437262B (en) | Micro-nano basic magnesium carbonate flame retardant and preparation method thereof | |
| CN114181702B (en) | Preparation method of cerium-doped yttrium aluminum garnet fluorescent powder | |
| CN109456564B (en) | Anti-aging rubber and preparation method thereof | |
| CN102002122A (en) | Preparation method of nano hydrotalcite/nano zinc oxide composite modified polyvinyl chloride resin | |
| CN110294862B (en) | Preparation method of nano-hybrid tin-based smoke suppressant | |
| CN105967228B (en) | Preparation method of graded porous barium titanate submicron-level particle sphere |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shanghai Huahui Curtain Wall Manufacturing Co., Ltd. Assignor: Shanghai University Contract fulfillment period: 2007.9.10 to 2012.12.31 contract change Contract record no.: 2008310000105 Denomination of invention: Process for preparing nano aluminium hydroxide Granted publication date: 20061122 License type: Exclusive license Record date: 2008.10.6 Assignee: Xiandeng Electric Equipment Co., Ltd., Zhejiang Assignor: Shanghai University Contract fulfillment period: 2007.4.18 to 2015.4.17 contract change Contract record no.: 2008330001469 Denomination of invention: Process for preparing nano aluminium hydroxide Granted publication date: 20061122 License type: Exclusive license Record date: 20081029 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.4.18 TO 2015.4.17; CHANGE OF CONTRACT Name of requester: ZHEJIANG PROVINCE XIANDENG ELECTRICAL EQUIPMENT CO Effective date: 20081029 Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.9.10 TO 2012.12.31; CHANGE OF CONTRACT Name of requester: SHANGHAI HUAHUI WALL MAKING ENGINEERING CO., LTD. Effective date: 20081006 |