JPS6228823B2 - - Google Patents
Info
- Publication number
- JPS6228823B2 JPS6228823B2 JP10133079A JP10133079A JPS6228823B2 JP S6228823 B2 JPS6228823 B2 JP S6228823B2 JP 10133079 A JP10133079 A JP 10133079A JP 10133079 A JP10133079 A JP 10133079A JP S6228823 B2 JPS6228823 B2 JP S6228823B2
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- aluminum hydroxide
- apparent viscosity
- weight
- group
- 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
Links
- 239000002002 slurry Substances 0.000 claims description 49
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 7
- 239000002270 dispersing agent Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 7
- 239000011324 bead Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 3
- 239000006255 coating slurry Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 229910001388 sodium aluminate Inorganic materials 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 238000004131 Bayer process Methods 0.000 description 1
- QXJJQWWVWRCVQT-UHFFFAOYSA-K calcium;sodium;phosphate Chemical compound [Na+].[Ca+2].[O-]P([O-])([O-])=O QXJJQWWVWRCVQT-UHFFFAOYSA-K 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052816 inorganic phosphate Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Paper (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Description
【発明の詳細な説明】
本発明は水酸化アルミニウムスラリーのレオロ
ジー的性質を改良する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving the rheological properties of aluminum hydroxide slurries.
さらに詳しくは本発明は製紙用塗被スラリーと
して好適な性質を有する水酸化アルミニウムスラ
リーを製造する方法に関する。 More specifically, the present invention relates to a method for producing an aluminum hydroxide slurry having properties suitable as a coating slurry for paper manufacturing.
近年水酸化アルミニウムの製紙用顔料としての
需要が増大している。 In recent years, demand for aluminum hydroxide as a pigment for paper manufacturing has increased.
微粒の水酸化アルミニウムはアルミナ製造バイ
ヤー工程中のアルミン酸ソーダ溶液の急激な加水
分解反応により晶出され、これを過乾燥するこ
とにより製造される。この水酸化アルミニウムは
微粒の六角板状結晶で、白色度が高いためすぐれ
た製紙用塗工顔料であり、スラリー状にして用い
られる。この場合単に所要の水分のあるスラリー
としただけでは、高速の塗工機用としたとき、必
ずしもそのスラリー特性は充分ではない。すなわ
ち最近の塗工装置ではその高速性から塗被スラリ
ーの水分蒸発量を極力少くするため、できるだけ
高濃度で低粘度の塗被スラリーをつくる必要があ
り、また高い剪断速度でのレオロジー的性質が良
好であることが要求される。 Fine particles of aluminum hydroxide are crystallized by a rapid hydrolysis reaction of a sodium aluminate solution during the Bayer process for producing alumina, and are produced by over-drying the crystals. This aluminum hydroxide is a fine-grained hexagonal plate-shaped crystal with high whiteness, making it an excellent coating pigment for papermaking, and is used in the form of a slurry. In this case, simply forming a slurry with the required moisture does not necessarily provide sufficient slurry properties when used in a high-speed coating machine. In other words, in order to minimize the amount of water evaporation in the coating slurry due to the high speed of modern coating equipment, it is necessary to create a coating slurry with as high concentration and low viscosity as possible. Good quality is required.
本発明者らはこの目的を達成するために鋭意研
究を行つた結果本発明を完成した。 The present inventors completed the present invention as a result of intensive research to achieve this objective.
すなわち本発明は、平均粒子径0.1〜２μの水
酸化アルミニウムよりなる固形分が50重量％〜75
重量％であるケーキに、製紙工業において通常使
用される分散剤を、該ケーキに0.1重量％〜1.0重
量％添加混合して見掛粘度300〜2000センチポイ
ズのスラリーを得、該スラリーを径が１mm〜５mm
である剛球体群とともに容器にいれ、剛球体群を
容器内で回転移動させてスラリーを撹拌すること
によりスラリーのレオロジー的性質を改良するも
のである。 That is, in the present invention, the solid content of aluminum hydroxide with an average particle size of 0.1 to 2μ is 50% to 75% by weight.
% by weight of the cake, 0.1% to 1.0% by weight of a dispersant commonly used in the paper industry is added and mixed to the cake to obtain a slurry with an apparent viscosity of 300 to 2000 centipoise, and the slurry is mixed with a diameter of 1 mm. ~5mm
The rheological properties of the slurry are improved by placing the slurry in a container together with a group of hard spheres, and stirring the slurry by rotationally moving the group of hard spheres within the container.
水酸化アルミニウムスラリーはアルミン酸ソー
ダ溶液から晶出した微粒の水酸化アルミニウムを
過洗浄して得られたケーキを原料とするが、ケ
ーキ中の水酸化アルミニウムは平均粒子径が0.1
〜２μであることが必要である。これより微細で
あると、生産性が極めて悪化し実用上困難であ
る。又これより粒子径が大であると、白色度、平
滑性、インキ受容性等の製紙用顔料としての必要
な特性が得られない。 Aluminum hydroxide slurry is made from a cake obtained by overwashing fine particles of aluminum hydroxide crystallized from a sodium aluminate solution, and the aluminum hydroxide in the cake has an average particle size of 0.1.
~2μ is required. If it is finer than this, productivity will be extremely poor and it will be difficult in practice. If the particle size is larger than this, it will not be possible to obtain the necessary properties as a papermaking pigment such as whiteness, smoothness, and ink receptivity.
又ケーキの固形物は重量％で50〜75の間にある
が、スラリーとするためには前記範囲であること
がのぞましい。 The solid content of the cake is between 50 and 75% by weight, but it is preferably within the above range in order to form a slurry.
ケーキに分散剤を添加して、撹拌混合して見掛
粘度300〜2000センチポイズのスラリーとする
が、分散剤の添加量はケーキに対して0.1重量％
〜1.0重量％であることが必要である。又分散剤
は製紙工業で通常使用されるもの、例えばポリア
クリルアミド系、ポリアクリル酸ソーダ、ポリア
クリル酸アンモニウム、無機リン酸塩、等が使用
される。次にスラリーを径が１mm〜５mmである剛
体球群とともに容器に入れ、剛体球群を回転移動
させてスラリーを撹拌する。剛体球群としてはセ
ラミツクス、ガラス、ジルコン等スラリーと反応
しない剛体であればよい。剛球体群を収容し、こ
の目的に合う装置としては、例えばビーズミルが
ある。 A dispersant is added to the cake and mixed by stirring to form a slurry with an apparent viscosity of 300 to 2000 centipoise.The amount of dispersant added is 0.1% by weight based on the cake.
~1.0% by weight is required. As the dispersant, those commonly used in the paper industry, such as polyacrylamide, sodium polyacrylate, ammonium polyacrylate, and inorganic phosphates, are used. Next, the slurry is placed in a container together with a group of hard spheres having a diameter of 1 mm to 5 mm, and the group of hard spheres is rotated to stir the slurry. The group of rigid spheres may be any rigid body that does not react with the slurry, such as ceramics, glass, or zircon. An example of a device that accommodates groups of rigid spheres and is suitable for this purpose is a bead mill.
剛球体群に撹拌されるとスラリーの見掛粘度は
時間の経過とともに低下するが、一定値まで低下
后、なお撹拌をつゞけると、見掛粘度は上昇し始
める。したがつて剛球体群の種類、撹拌の程度、
時間を適宜選択することが必要である。又スラリ
ーの見掛粘度以外のレオロジー的性質も前記の処
理により改良される。すなわち処理前のスラリー
はダイラタント性の強い高粘度を示すが、本発明
の方法で処理したスラリーの流動性質はニユート
ニアンフローに近い性質を示し、塗工機の高速化
にも充分適応できるものである。 When the slurry is stirred by a group of hard spheres, the apparent viscosity of the slurry decreases over time, but after it has decreased to a certain value, if stirring is continued, the apparent viscosity begins to rise. Therefore, the type of hard sphere group, the degree of stirring,
It is necessary to select the time appropriately. The rheological properties of the slurry other than the apparent viscosity are also improved by the treatment described above. In other words, the slurry before treatment exhibits a high viscosity with strong dilatant properties, but the fluidity of the slurry treated by the method of the present invention is close to Newtonian flow, and is fully adaptable to high-speed coating machines. be.
次に本発明を実施例、比較例にもとづいて説明
する。 Next, the present invention will be explained based on Examples and Comparative Examples.
実施例
アルミン酸ソーダ溶液から晶出した粒子径が１
μである微粒水酸化アルミニウムを過洗浄して
得た固形分70％のケーキにポリアクリルアミド系
分散剤（東亜合成製アロンF40）を純分換算0.25
重量％添加し、撹拌して見掛粘度450センチポイ
ズのスラリーを得た。このスラリーを内容積５
で1.5mmφのガラス球を80％充填したビーズミル
に連続的に投入し、ビーズミルを使用し、周速12
ｍ／ｓの撹拌速度条件下で処理を実施した。スラ
リーの投入速度、即ちミル中のスラリーの滞留時
間を変化させ、ミル外に排出されたスラリーの見
掛粘度をハーキユレス粘度計で1.8×10-4sec-1の
剪断速度を与えて測定した。その結果を第１図に
示す。図に於て縦軸はセンチポイズで示されたス
ラリーの粘度、横軸は分で示されたスラリーのミ
ル中の滞留時間である。スラリーははじめは滞留
時間が長くなるにしたがつて見掛粘度は低下して
いるが、一定値に低下后、又増大している。すな
わち滞留時間を適切に選択することにより見掛粘
度を低くすることができることがわかる。Example Particle size crystallized from sodium aluminate solution is 1
A polyacrylamide-based dispersant (Aron F40 manufactured by Toagosei Co., Ltd.) was added to a cake with a solid content of 70% obtained by over-washing microscopic aluminum hydroxide with a purity of 0.25%.
% by weight was added and stirred to obtain a slurry with an apparent viscosity of 450 centipoise. This slurry has an internal volume of 5
Continuously feed 1.5mmφ glass spheres into a bead mill filled with 80%, and use the bead mill at a circumferential speed of 12.
The treatment was carried out under stirring speed conditions of m/s. The apparent viscosity of the slurry discharged outside the mill was measured using a Hercules viscometer at a shear rate of 1.8×10 −4 sec −1 while changing the slurry input speed, that is, the residence time of the slurry in the mill. The results are shown in FIG. In the figure, the vertical axis is the viscosity of the slurry in centipoise, and the horizontal axis is the residence time of the slurry in the mill in minutes. Initially, the apparent viscosity of the slurry decreases as the residence time increases, but after decreasing to a certain value, it increases again. That is, it can be seen that the apparent viscosity can be lowered by appropriately selecting the residence time.
次にこの実施例においてビーズミル中の滞留時
間が210秒であるスラリーについて他の流動性質
を測定した。その結果を第３図の曲線１に示す。
図において縦軸はr.p.mであらわされる剪断速
度、横軸はdyn.cmでありらわされるトルクであ
り、測定はハーキユレス社の粘度計を使用し、
Bob“ｂ”剪断速度０〜1.8×104sec-1の範囲で行
つた。曲線１は本発明の処理を行つたスラリーは
剪断速度の上昇にしたがつて極めて徐々にトルク
が上昇していることを示している。 Other flow properties were then measured for the slurry in this example, where the residence time in the bead mill was 210 seconds. The results are shown in curve 1 of FIG.
In the figure, the vertical axis is the shear rate expressed in rpm, and the horizontal axis is the torque expressed in dyn.cm.The measurement was performed using a Hercules viscometer.
Bob "b" shear rates ranged from 0 to 1.8 x 104 sec -1 . Curve 1 shows that the slurry treated according to the invention has a very gradual increase in torque as the shear rate increases.
比較例
実施例においてビーズミルに投入したスラリー
と全く同性質のスラリー200ｇを、10mmφのアル
ミナボール１Kgとともに容積１リツトルの振動ミ
ルにいれ振巾５mmの振動を与え、各種の処理時間
について実施例と全く同様に見掛粘度を測定し
た。その結果を第２図に示す。縦軸、横軸は第１
図と同様である。見掛粘度は処理時間60〜90分ぐ
らいまで低下しているが、その低下の程度は極め
て低く、又処理時間が前記時間をすぎると増大し
ている。Comparative Example 200 g of slurry having the same properties as the slurry that was put into the bead mill in the example was put into a 1 liter vibrating mill together with 1 kg of 10 mmφ alumina balls, and vibration was applied to a vibration width of 5 mm.The various processing times were the same as in the example. Apparent viscosity was measured in the same manner. The results are shown in FIG. The vertical and horizontal axes are the first
It is similar to the figure. Although the apparent viscosity decreases during the treatment time of about 60 to 90 minutes, the extent of the decrease is extremely low, and increases as the treatment time exceeds the above-mentioned time.
第３図の曲線２はこの比較例のスラリーを90分
処理したもの、曲線３は未処理スラリーの流動性
質を実施例のビーズミル中の滞留時間210分スラ
リーと同様に測定した結果を示すものである。未
処理スラリーは低剪断速度で急激にトルクが高く
なり、又本比較例処理スラリーも、未処理スラリ
ーよりも低剪断速度でのトルクの増加は少いが、
実施例に示したものよりもトルクの増大極わめて
大である。 Curve 2 in Figure 3 shows the result of processing the slurry of this comparative example for 90 minutes, and curve 3 shows the results of measuring the flow properties of the untreated slurry in the same manner as the slurry of the example with a residence time of 210 minutes in the bead mill. be. The torque of the untreated slurry suddenly increases at low shear speeds, and the treated slurry of this comparative example also shows a smaller increase in torque at low shear speeds than the untreated slurry, but
The increase in torque is extremely large compared to that shown in the example.
比較例の処理にても水酸化アルミニウムスラリ
ーのレオロジーの改質効果はあるが、本発明の方
法を実施することにより、短時間で水酸化アルミ
ニウムスラリーのレオロジーが改質され、この改
質効果は極めて高く本発明は極めて有効であり、
このスラリーは製紙用としてすぐれていることが
あきらかである。 The treatment of the comparative example also has the effect of modifying the rheology of the aluminum hydroxide slurry, but by implementing the method of the present invention, the rheology of the aluminum hydroxide slurry is modified in a short time, and this modification effect is The present invention is extremely effective;
It is clear that this slurry is excellent for paper making.
第１図は実施例の見掛粘度の変化を示す図、第
２図は比較例の見掛粘度の変化を示す図、第３図
は実施例、比較例、未処理の各スラリーの剪断速
度とトルクとの関係を示す図。
Figure 1 is a diagram showing the change in apparent viscosity of the example, Figure 2 is a diagram showing the change in apparent viscosity of the comparative example, and Figure 3 is the shear rate of each slurry of the example, comparative example, and untreated slurry. FIG. 3 is a diagram showing the relationship between and torque.
Claims (1)
よりなる固形分が50重量％〜75重量％であるケー
キに、分散剤を0.1重量％〜0.3重量％添加して見
掛粘度300〜2000センチポイズのスラリーを得、
該スラリーを、直径１mm〜５mmの剛球体群ととも
に容器にいれ、剛球体群を容器内で回転移動させ
てスラリーを撹拌することによりスラリーのレオ
ロジー的性質を改良することを特徴とする製紙用
塗被スラリーの製造方法。1 A slurry with an apparent viscosity of 300 to 2000 centipoise is made by adding 0.1% to 0.3% by weight of a dispersant to a cake made of aluminum hydroxide with an average particle size of 0.1 to 2μ and a solid content of 50% to 75% by weight. obtained,
A papermaking coating characterized in that the slurry is placed in a container together with a group of hard spheres having a diameter of 1 mm to 5 mm, and the rheological properties of the slurry are improved by stirring the slurry by rotationally moving the group of hard spheres within the container. Method for producing slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10133079A JPS5626959A (en) | 1979-08-10 | 1979-08-10 | Production of coating slurry for paper making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10133079A JPS5626959A (en) | 1979-08-10 | 1979-08-10 | Production of coating slurry for paper making |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5626959A JPS5626959A (en) | 1981-03-16 |
| JPS6228823B2 true JPS6228823B2 (en) | 1987-06-23 |
Family
ID=14297812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10133079A Granted JPS5626959A (en) | 1979-08-10 | 1979-08-10 | Production of coating slurry for paper making |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5626959A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2517175Y2 (en) * | 1986-11-14 | 1996-11-13 | アルプス電気株式会社 | Magnetic head |
-
1979
- 1979-08-10 JP JP10133079A patent/JPS5626959A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5626959A (en) | 1981-03-16 |
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