JPH06263437A - Production of platy boehmite particles - Google Patents
Production of platy boehmite particlesInfo
- Publication number
- JPH06263437A JPH06263437A JP5069164A JP6916493A JPH06263437A JP H06263437 A JPH06263437 A JP H06263437A JP 5069164 A JP5069164 A JP 5069164A JP 6916493 A JP6916493 A JP 6916493A JP H06263437 A JPH06263437 A JP H06263437A
- Authority
- JP
- Japan
- Prior art keywords
- particles
- boehmite particles
- boehmite
- aluminum hydroxide
- alkali metal
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/447—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by wet processes
- C01F7/448—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by wet processes using superatmospheric pressure, e.g. hydrothermal conversion of gibbsite into boehmite
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、板状アルミナ粒子製造
の出発原料又は充填材として使用される塗料用顔料、ゴ
ム・プラスチック用フィラー、製紙用塗工材等に適した
板状ベーマイト粒子を水熱処理により効率的に製造する
方法に関する。FIELD OF THE INVENTION The present invention provides plate-like boehmite particles suitable for use as a starting material or filler for the production of plate-like alumina particles, pigments for paints, fillers for rubber / plastics, coating materials for papermaking, etc. The present invention relates to a method for efficiently manufacturing by hydrothermal treatment.
【０００２】[0002]
【従来の技術】従来、この種のベーマイト粒子及びその
製造方法としては、種々知られており、出発原料に水酸
化アルミニウムを用いて大気中で加熱分解を行い、結晶
水の一部を脱水させベーマイト相を生成するもの、また
同出発原料を密閉容器中で水熱処理することによりベー
マイト相を生成するもの等がある。2. Description of the Related Art Conventionally, various kinds of boehmite particles of this type and a method for producing the same are known, and aluminum hydroxide is used as a starting material for thermal decomposition in the atmosphere to dehydrate a part of crystal water. There are those that form a boehmite phase, and those that form a boehmite phase by hydrothermally treating the same starting material in a closed container.
【０００３】[0003]
【発明が解決しようとする課題】微細ベーマイト粒子と
しては、上記により得られた粒子をボールミル等の機械
的粉砕法により、サブミクロンオーダーの粒子に微細化
することができるが、粒子の形状が粒状になりやすく、
板状の微細な粒子を得難いといった問題を有する。As the fine boehmite particles, the particles obtained as described above can be finely divided into particles of submicron order by a mechanical grinding method such as a ball mill. It is easy to become
There is a problem that it is difficult to obtain plate-shaped fine particles.
【０００４】また、上記微細ベーマイト粒子の製造方法
のうち、大気中で加熱分解を行う方法については、出発
原料の水酸化アルミニウムに微細粒子が混在するとベー
マイト相は出現せず、還移アルミナの一種であるカイア
ルミナ（χ−Ａｌ2Ｏ3）が生成し、ベーマイト粒子の生
成率を低下させるといった問題がある。水熱処理を行う
場合、生成されるベーマイト粒子は、菱形状の立方体が
密に凝集固着した凝集粒子となり、これを粉砕しても板
状粒子は得難いといった問題を有する。Further, among the above-mentioned methods for producing fine boehmite particles, regarding the method of performing thermal decomposition in the atmosphere, when fine particles are mixed in the starting material aluminum hydroxide, the boehmite phase does not appear, which is a kind of retransferred alumina. However, there is a problem that chialumina (χ-Al 2 O 3 ) is generated and the production rate of boehmite particles is reduced. When the hydrothermal treatment is performed, the boehmite particles produced become agglomerated particles in which diamond-shaped cubes are densely agglomerated and fixed, and there is a problem that it is difficult to obtain plate-like particles even if they are crushed.
【０００５】そこで、本発明はアスペクト比の大きな板
状ベーマイト粒子を効率的に製造できる製造方法を提供
すると共に、バイヤー法で作られた純度の悪い水酸化ア
ルミニウムやアルミナ水和物等からも容易に板状ベーマ
イト粒子を製造できる方法を提供することを目的とす
る。Therefore, the present invention provides a production method capable of efficiently producing plate-like boehmite particles having a large aspect ratio, and also facilitates production of aluminum hydroxide or alumina hydrate having a low purity produced by the Bayer method. It is an object of the present invention to provide a method capable of producing plate-shaped boehmite particles.
【０００６】[0006]
【課題を解決するための手段】本発明の第１発明は、ア
ルカリ金属化合物を含有した水酸化アルミニウム又は水
和物を水熱合成処理する板状ベーマイト粒子の製造方法
である。また、本発明の第２発明は、水酸化アルミニウ
ム又はアルミナ水和物をアルカリ金属化合物を含む水溶
液中で水熱合成処理する板状ベーマイト粒子の製造方法
である。アルカリ金属化合物の存在下で水酸化アルミニ
ウム又はアルミナ水和物の水熱合成処理を行なうことに
より、生成するベーマイト粒子は粗大薄肉化する傾向を
示し、菱形板状を示す外形も六角板状もしくは不定形で
アスペクト比（対角長さ／厚さ）の非常に大きな板状粒
子に結晶成長させることができる。The first aspect of the present invention is a method for producing plate-like boehmite particles, which comprises subjecting aluminum hydroxide or hydrate containing an alkali metal compound to a hydrothermal synthesis treatment. A second invention of the present invention is a method for producing plate-shaped boehmite particles, which comprises subjecting aluminum hydroxide or alumina hydrate to hydrothermal synthesis treatment in an aqueous solution containing an alkali metal compound. By hydrothermally synthesizing aluminum hydroxide or alumina hydrate in the presence of an alkali metal compound, the boehmite particles produced tend to become coarse and thin, and the rhombic plate-like outer shape also has a hexagonal plate shape or Crystals can be grown into plate-like particles having a fixed shape and a very large aspect ratio (diagonal length / thickness).
【０００７】アルカリ金属化合物としては、例えば、リ
チウム、カリウム、ナトリウムの水酸化物、炭酸塩、硝
酸塩、硫酸塩等があり、かかるアルカリ金属化合物の含
有量は、水酸化アルミニウム又は、アルミナ水和物、１
モルに対して１０×１０-2モル以下（０は含まない）で
あることが好ましい。１０×１０-2モルを超えた場合、
板状ベーマイト粒子の収率が急激に低下する。例えば、
アルカリ金属化合物として水酸化ナトリウムを用いた場
合、１０×１０-2モルを越えると、アルミン酸ナトリウ
ムが生成され、板状ベーマイトの収率が低下する。Examples of the alkali metal compound include hydroxides, carbonates, nitrates and sulfates of lithium, potassium and sodium. The content of the alkali metal compound is aluminum hydroxide or alumina hydrate. 1
It is preferably 10 × 10 -2 mol or less (not including 0) with respect to mol. If it exceeds 10 × 10 -2 mol,
The yield of plate-shaped boehmite particles is drastically reduced. For example,
When sodium hydroxide is used as the alkali metal compound, if it exceeds 10 × 10 −2 mol, sodium aluminate is produced and the yield of plate-like boehmite decreases.
【０００８】更に、水酸化アルミニウム又はアルミナ水
和物１モルに対して、アルカリ金属化合物の含有量を１
×１０-2〜８×１０-2モルの範囲とすることにより、よ
り顕著な効果が得られる。なお、含有するアルカリ金属
化合物は、そのものが原料中に不純物として包含されて
いる場合は、その量に基づいて添加量を調整する。Furthermore, the content of the alkali metal compound is 1 with respect to 1 mol of aluminum hydroxide or alumina hydrate.
A more remarkable effect can be obtained by setting the range of × 10 -2 to 8 × 10 -2 mol. When the raw material itself is contained as an impurity in the raw material, the addition amount of the alkali metal compound is adjusted based on the amount.
【０００９】以下、本発明の製造方法について詳述す
る。出発原料としてアルカリ金属化合物を含有する水酸
化アルミニウム、アルミナ水和物又はアルミナゲル等の
アルミナ水和物などをあらかじめボールミル等で粉砕し
てサブミクロンオーダーに粒度調整したものあるいは、
前記出発原料でアルカリ金属化合物を実質的に含有しな
いものを用い、これらをアルカリ金属化合物を含有する
水溶液とともに密閉オートクレーブ中に充填し、水熱処
理することにより行なわれる。The manufacturing method of the present invention will be described in detail below. Aluminum hydroxide containing an alkali metal compound as a starting material, or alumina hydrate such as alumina hydrate or alumina gel is pulverized in advance with a ball mill or the like and the particle size is adjusted to the submicron order, or
It is carried out by using a starting material that does not substantially contain an alkali metal compound, filling the same with an aqueous solution containing an alkali metal compound in a closed autoclave, and subjecting it to a hydrothermal treatment.
【００１０】ここで出発原料である水酸化アルミニウ
ム、アルミナ水和物｛非晶質を含むアルミナ水和物（ア
ルミナゲル）｝をサブミクロンオーダーに粒度調整する
ことは、最終ベーマイト粒子の寸法をサブミクロンオー
ダーに揃えるために必要であり、粒子の板状化に大きく
寄与する。Here, the aluminum hydroxide and alumina hydrate (alumina hydrate containing amorphous (alumina gel)), which are the starting materials, are adjusted to a submicron size by adjusting the particle size of the final boehmite particles. It is necessary to make it on the order of micron and greatly contributes to the plate-like formation of particles.
【００１１】温度、圧力の条件に関しては、Ａｌ2Ｏ3−
Ｈ2Ｏ系状態図でベーマイト相の安定な領域でなければ
ならない。したがって、水熱処理の温度は１５０℃以
上、圧力は１００気圧以下であることが望ましい。これ
は温度１５０℃未満では、ベーマイトを得ることができ
ないためである。特に上限については、限定していない
が、３５０℃以上の温度に長時間処理するとベーマイト
相はα−アルミナ相に変化するため、高温処理はベーマ
イト相生成には好ましくない。また、板状のベーマイト
粒子のみを製造する際、その制御が困難となる。したが
って、温度条件は好ましくは１５０℃以上３５０℃未満
がよい。また、上記範囲において、高温ほどベーマイト
の生成速度は大きく、短時間で微細な粒子が得られ、低
温ほどベーマイトの生成速度は小さく、長時間の処理を
必要とするため比較的粗大な粒子となる。なお、いずれ
においても粒子形状は板状である。また、圧力が１００
気圧を越えた場合、得られる粒子の形状が肉厚の大きな
粗大なものとなるためである。数百気圧を越える高圧下
では、ベーマイト相は出現せず、ダイアスポア相に変化
する。また、下限については、当然開放系では、水熱系
が成り立たないので、好ましくは１０気圧以上がよい。Regarding temperature and pressure conditions, Al 2 O 3-
It must be in the stable region of the boehmite phase in the H 2 O phase diagram. Therefore, it is desirable that the temperature of the hydrothermal treatment is 150 ° C. or higher and the pressure is 100 atm or lower. This is because boehmite cannot be obtained at a temperature lower than 150 ° C. Although the upper limit is not particularly limited, the high temperature treatment is not preferable for the formation of the boehmite phase because the boehmite phase changes to the α-alumina phase when the treatment is performed at a temperature of 350 ° C. or higher for a long time. Moreover, when only plate-shaped boehmite particles are produced, the control thereof becomes difficult. Therefore, the temperature condition is preferably 150 ° C. or higher and lower than 350 ° C. Further, in the above range, the higher the temperature, the higher the boehmite generation rate, and the finer particles can be obtained in a shorter time. The lower the temperature, the lower the boehmite generation rate, and the longer the treatment, the larger the particles become. . In each case, the particle shape is plate-like. Also, the pressure is 100
This is because when the pressure exceeds the atmospheric pressure, the shape of the obtained particles becomes coarse with a large wall thickness. Under high pressure exceeding several hundreds of atmospheric pressure, the boehmite phase does not appear, but changes to the diaspore phase. As for the lower limit, a hydrothermal system does not work in an open system, so it is preferably 10 atmospheres or more.
【００１２】以下、本発明の製造方法によって得られる
ベーマイト粒子について詳述する。上記製造方法によっ
て得られるベーマイト粒子は、結晶形が斜方晶系で特定
の結晶面が平板状に成長した板状粒子であり、粒径は長
径及び短径が約５μｍ以下であり、条件によってはサブ
ミクロンである。また短径と長径との比は１〜５、さら
には１〜１．５であり、アスペクト比（対角長さ／厚
さ）は、３〜１００の形状である。The boehmite particles obtained by the production method of the present invention will be described in detail below. The boehmite particles obtained by the above-mentioned production method are plate-like particles having a crystal form of an orthorhombic system and having a specific crystal plane grown in a flat plate shape, and the particle size has a major axis and a minor axis of about 5 μm or less. Is submicron. The ratio of the minor axis to the major axis is 1 to 5, further 1 to 1.5, and the aspect ratio (diagonal length / thickness) is 3 to 100.
【００１３】かかるベーマイト粒子は、微細板状アルミ
ナ粒子を作製するための材料（原材料）、または塗料用
顔料、ゴム、プラスチック用フィラー、製紙用塗工材な
どの添加物として使用できる。The boehmite particles can be used as a material (raw material) for producing fine plate-like alumina particles, or as an additive for paint pigments, rubber, fillers for plastics, coating materials for papermaking and the like.
【００１４】[0014]
【実施例】以下、実施例に基づき本発明を具体的に説明
する。バイヤー法によって得た水酸化アルミニウム（水
酸化アルミニウム１モルに対して水酸化ナトリウムとし
て３×１０-3モル含有した水酸化アルミニウム）に水を
加え、これをボールミルにて粉砕後、乾燥し、中心径
０．７μｍに粒度調整したもの１０ｇに同等量の純水お
よび表１に示す量の水酸化ナトリウムを加えてスラリー
を作製し、これを小型オートクレーブに充填し、加熱温
度３００℃、圧力６５ｋｇ／ｃｍ2にて２時間水熱処理
を行った。EXAMPLES The present invention will be specifically described below based on examples. Water is added to aluminum hydroxide obtained by the Bayer method (aluminum hydroxide containing 3 × 10 −3 mol of sodium hydroxide based on 1 mol of aluminum hydroxide), which is crushed by a ball mill and dried to obtain a center. To 10 g of which the particle size was adjusted to 0.7 μm, the same amount of pure water and the amount of sodium hydroxide shown in Table 1 were added to prepare a slurry, which was filled in a small autoclave, and the heating temperature was 300 ° C. and the pressure was 65 kg / Hydrothermal treatment was performed at cm 2 for 2 hours.
【００１５】処理後の生成物を水洗、濾過、乾燥してベ
ーマイト粒子を得、これを試料とし、粉末の形状、粒子
径と、水酸化ナトリウムの添加量との関係を調べた。こ
の結果を表１に示す。なお表１において、水酸化ナトリ
ウムのモル数はＡｌ(ＯＨ)3１モルに対する量である。The product after the treatment was washed with water, filtered and dried to obtain boehmite particles, which were used as a sample to examine the relationship between the powder shape and particle size and the amount of sodium hydroxide added. Table 1 shows the results. In Table 1, the number of moles of sodium hydroxide is the amount based on 1 mole of Al (OH) 3 .
【００１６】◇[0016] ◇
【表１】 表１によればすべての範囲内で板状のベーマイト粒子が
得られ、その粒径（平均粒径）１〜２．５μｍ、アスペ
クト比が５〜３１のものが得られていることが分かると
ともに、水酸化ナトリウムの添加量の増加にともない、
アスペクト比が大きくなることが分かる。また、添加量
が１×１０-2モルから６×１０-2モルの範囲において
は、特により顕著な効果があることが分かる。また、表
１には示されていないが、水酸化ナトリウムの添加量が
１０×１０-2モルを越えた場合は、アルミン酸ナトリウ
ムが生成され、ベーマイト粒子の収率が急激に低下し
た。また、得られたベーマイト粒子は、水酸化ナトリウ
ム添加量６×１０-2モル程度のものであった。[Table 1] According to Table 1, it was found that plate-shaped boehmite particles were obtained in all ranges, and the particle diameter (average particle diameter) of 1 to 2.5 μm and the aspect ratio of 5 to 31 were obtained. , With the increase in the amount of sodium hydroxide added,
It can be seen that the aspect ratio becomes large. Further, it can be seen that a particularly remarkable effect is obtained when the addition amount is in the range of 1 × 10 -2 mol to 6 × 10 -2 mol. Although not shown in Table 1, when the amount of sodium hydroxide added exceeded 10 × 10 -2 mol, sodium aluminate was produced and the yield of boehmite particles was drastically reduced. The obtained boehmite particles had a sodium hydroxide addition amount of about 6 × 10 -2 mol.
【００１７】また、以上の結果は図１〜３に示される電
子顕微鏡写真を比較することにより明白である。なお、
図１は表１のＮo.１、図２は表１のＮo.３、図３は表１
のＮo.５に示される試料の電子顕微鏡写真である。ま
た、比較のため、純度９９．９％の水酸化アルミニウム
を用い、水酸化ナトリウムを添加しないで上記と同様な
方法でベーマイト粒子を作製した。得られた粒子は形状
が粒状で、粒径が１μｍ、アスペクト比がほぼ１のもの
であった。Further, the above results are clear by comparing the electron micrographs shown in FIGS. In addition,
Figure 1 is No. 1 of Table 1, Figure 2 is No. 3 of Table 1, and Figure 3 is Table 1
6 is an electron micrograph of the sample shown in No. 5 of No. In addition, for comparison, aluminum hydroxide having a purity of 99.9% was used, and boehmite particles were produced by the same method as above without adding sodium hydroxide. The obtained particles had a granular shape, a particle size of 1 μm, and an aspect ratio of about 1.
【００１８】なお、上記実施例においては、スラリー作
製時に水酸化ナトリウムを添加したが、バイヤー法によ
って得られた水酸化アルミニウムに水を加え湿式粉砕す
る際に添加した場合も同様の結果が得られた。また、本
発明において高純度な水酸化アルミニウムに水酸化ナト
リウムを添加した場合も同様の結果が得られたととも
に、水酸化ナトリウム以外のアルカリ金属化合物を含有
したものでも同様の結果が得られる。In the above examples, sodium hydroxide was added at the time of preparing the slurry, but similar results can be obtained when water is added to aluminum hydroxide obtained by the Bayer method and wet-milled. It was Further, in the present invention, similar results were obtained when sodium hydroxide was added to high-purity aluminum hydroxide, and similar results were obtained when the alkali metal compound other than sodium hydroxide was contained.
【００１９】[0019]
【発明の効果】本発明の製造方法によれば、粒径の揃っ
たアスペクト比の大きな板状ベーマイト粒子を得ること
ができるとともに、粒径及びアスペクト比を所望の大き
さに制御することができる。According to the manufacturing method of the present invention, it is possible to obtain plate-like boehmite particles having a uniform particle size and a large aspect ratio, and to control the particle size and aspect ratio to desired sizes. .
【００２０】また上記製造方法によって得られる微細板
状ベーマイト粒子は、板状アルミナ粒子を作製するのに
有用であるとともに、塗料用顔料、ゴム、プラスチック
用フィラー、製紙用塗工材等の各種添加物として有用で
ある。The fine plate-like boehmite particles obtained by the above-mentioned production method are useful for preparing plate-like alumina particles, and various additives such as pigments for paints, rubbers, fillers for plastics and coating materials for papermaking are added. It is useful as a thing.
【図１】表１のＮo.１で得られた試料の粒子構造を示す
顕微鏡写真である。FIG. 1 is a micrograph showing the particle structure of a sample obtained in No. 1 of Table 1.
【図２】表１のＮo.３で得られた試料の粒子構造を示す
顕微鏡写真である。2 is a micrograph showing the particle structure of the sample obtained in No. 3 of Table 1. FIG.
【図３】表１のＮo.５で得られた試料の粒子構造を示す
顕微鏡写真である。FIG. 3 is a micrograph showing a particle structure of a sample obtained in No. 5 of Table 1.
Claims (3)
ルミニウム又はアルミナ水和物を水熱合成処理すること
を特徴とする板状ベーマイト粒子の製造方法。1. A method for producing plate-like boehmite particles, which comprises subjecting aluminum hydroxide or alumina hydrate containing an alkali metal compound to hydrothermal synthesis treatment.
をアルカリ金属化合物を含む水溶液中で水熱合成処理す
ることを特徴とする板状ベーマイト粒子の製造方法。2. A method for producing plate-shaped boehmite particles, which comprises subjecting aluminum hydroxide or alumina hydrate to hydrothermal synthesis treatment in an aqueous solution containing an alkali metal compound.
アルミニウム又はアルミナ水和物１モルに対して３×１
０-3モル以上１０×１０-2モル以下である請求項１又は
請求項２のいずれかに記載の板状ベーマイト粒子の製造
方法。3. The content of the alkali metal compound is 3 × 1 with respect to 1 mol of aluminum hydroxide or alumina hydrate.
The method for producing plate-shaped boehmite particles according to claim 1 or 2, wherein the content is 0 -3 mol or more and 10 x 10 -2 mol or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5069164A JP2869287B2 (en) | 1993-03-05 | 1993-03-05 | Method for producing plate-like boehmite particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5069164A JP2869287B2 (en) | 1993-03-05 | 1993-03-05 | Method for producing plate-like boehmite particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06263437A true JPH06263437A (en) | 1994-09-20 |
| JP2869287B2 JP2869287B2 (en) | 1999-03-10 |
Family
ID=13394801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5069164A Expired - Fee Related JP2869287B2 (en) | 1993-03-05 | 1993-03-05 | Method for producing plate-like boehmite particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2869287B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759213A (en) * | 1995-04-24 | 1998-06-02 | University Of Florida | Method for controlling the size and morphology of alpha-alumina particles |
| JP2006056739A (en) * | 2004-08-19 | 2006-03-02 | Nissan Motor Co Ltd | Method for producing boehmite particle, and boehmite particle |
| JP2006143487A (en) * | 2004-11-16 | 2006-06-08 | Nissan Motor Co Ltd | Platy alumina particles, method for manufacturing platy alumina particles, resin composition and method for manufacturing resin composition |
| JP2009126735A (en) * | 2007-11-21 | 2009-06-11 | Kawai Sekkai Kogyo Kk | Cubic boehmite and its manufacturing method |
| JP2009227485A (en) * | 2008-03-19 | 2009-10-08 | Kanto Denka Kogyo Co Ltd | Boehmite fine particle, alumina fine particle, and method for producing them |
| CN104944453A (en) * | 2015-06-12 | 2015-09-30 | 安徽壹石通材料科技股份有限公司 | Preparation method of boehmite coated alumina material |
| WO2019049668A1 (en) | 2017-09-07 | 2019-03-14 | 株式会社Adeka | Composition, and flame-retardant resin composition |
| CN111795983A (en) * | 2020-06-29 | 2020-10-20 | 中国铝业股份有限公司 | Preparation method of standard sample for aluminum oxide alpha-phase determination |
| CN113371747A (en) * | 2021-06-11 | 2021-09-10 | 中铝郑州有色金属研究院有限公司 | Preparation method of boehmite with sheet structure and application of boehmite |
-
1993
- 1993-03-05 JP JP5069164A patent/JP2869287B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5759213A (en) * | 1995-04-24 | 1998-06-02 | University Of Florida | Method for controlling the size and morphology of alpha-alumina particles |
| JP2006056739A (en) * | 2004-08-19 | 2006-03-02 | Nissan Motor Co Ltd | Method for producing boehmite particle, and boehmite particle |
| JP4587740B2 (en) * | 2004-08-19 | 2010-11-24 | 日産自動車株式会社 | Method for producing boehmite particles and boehmite particles |
| JP2006143487A (en) * | 2004-11-16 | 2006-06-08 | Nissan Motor Co Ltd | Platy alumina particles, method for manufacturing platy alumina particles, resin composition and method for manufacturing resin composition |
| JP2009126735A (en) * | 2007-11-21 | 2009-06-11 | Kawai Sekkai Kogyo Kk | Cubic boehmite and its manufacturing method |
| JP2009227485A (en) * | 2008-03-19 | 2009-10-08 | Kanto Denka Kogyo Co Ltd | Boehmite fine particle, alumina fine particle, and method for producing them |
| CN104944453A (en) * | 2015-06-12 | 2015-09-30 | 安徽壹石通材料科技股份有限公司 | Preparation method of boehmite coated alumina material |
| WO2019049668A1 (en) | 2017-09-07 | 2019-03-14 | 株式会社Adeka | Composition, and flame-retardant resin composition |
| US11674037B2 (en) | 2017-09-07 | 2023-06-13 | Adeka Corporation | Composition, and flame-retardant resin composition |
| CN111795983A (en) * | 2020-06-29 | 2020-10-20 | 中国铝业股份有限公司 | Preparation method of standard sample for aluminum oxide alpha-phase determination |
| CN113371747A (en) * | 2021-06-11 | 2021-09-10 | 中铝郑州有色金属研究院有限公司 | Preparation method of boehmite with sheet structure and application of boehmite |
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| Publication number | Publication date |
|---|---|
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