JP2003054943A - Spherical composite body of plate-like calcium carbonate and production method therefor - Google Patents
Spherical composite body of plate-like calcium carbonate and production method thereforInfo
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- JP2003054943A JP2003054943A JP2002172585A JP2002172585A JP2003054943A JP 2003054943 A JP2003054943 A JP 2003054943A JP 2002172585 A JP2002172585 A JP 2002172585A JP 2002172585 A JP2002172585 A JP 2002172585A JP 2003054943 A JP2003054943 A JP 2003054943A
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- Prior art keywords
- calcium carbonate
- plate
- spherical
- basic
- reaction
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- 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.)
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、新規な板状構造を
有した炭酸カルシウムの球状複合体およびその製造方法
に関するものである。TECHNICAL FIELD The present invention relates to a spherical composite of calcium carbonate having a novel plate-like structure and a method for producing the same.
【０００２】[0002]
【従来の技術】従来から各種の多孔質物質が提案され、
それぞれの特性を生かして種々の分野で使用されてい
る。これらの多孔質物質のなかでも無機成分を構成成分
とするものとしては、ゼオライト、活性炭、珪酸カルシ
ウム、リン酸カルシウムなどが知られている。2. Description of the Related Art Conventionally, various porous materials have been proposed,
It is used in various fields by taking advantage of each characteristic. Among these porous substances, zeolite, activated carbon, calcium silicate, calcium phosphate, etc. are known as those having an inorganic component as a constituent.
【０００３】[0003]
【発明が解決しようとする課題】しかし、これらの多孔
質物質といわれている化合物には、それぞれ一長一短が
あり、いまだに充分に満足しうるものは得られていな
い。一般に多孔質物質は、球形に近い一次粒子をバイン
ダーなどを使用して球形に凝集させたものが殆どであっ
て、その細孔径は一次粒子径よりも小さいのが普通であ
る。また、その細孔は一次粒子の凝集間隙や製造時の
水、有機溶媒またはバインダーの蒸発に伴う空隙から形
成されたものであるので、細孔径を１μｍ以上にするこ
とは困難であった。また、これらの多孔質物質の殆ど
が、粒子の形状、細孔の大きさなどが固定されており、
それぞれの用途にみあった最適な品質にする自由度が殆
どないのが現状である。本発明者らは、先に「板状炭酸
カルシウムの製造方法」（特開平２−１８４５１）およ
び「板状塩基性炭酸カルシウムの製造方法」（特開平３
−２８５８１６）を発明したので、これらの知見をもと
に、従来多孔質物質の対象として検討されたことのない
炭酸カルシウムが、合成条件を変化させることによりそ
の形態を制御できることを見出し、多孔質物質の基材と
して採用し、製造条件により細孔径および細孔容積を変
えることのできる板状炭酸カルシウムの球状複合体を得
ようとしたものである。However, each of these compounds, which are said to be porous substances, has advantages and disadvantages, and a sufficiently satisfactory compound has not been obtained yet. In general, most porous substances are obtained by agglomerating primary particles having a nearly spherical shape into a spherical shape using a binder or the like, and the pore size thereof is usually smaller than the primary particle size. Further, since the pores are formed by the agglomeration gaps of the primary particles and the pores associated with the evaporation of water, the organic solvent or the binder at the time of production, it is difficult to make the pore diameter 1 μm or more. Also, most of these porous substances have a fixed particle shape, pore size, etc.,
Under the present circumstances, there is almost no freedom to optimize the quality according to each use. The inventors of the present invention have previously described "a method for producing plate-like calcium carbonate" (JP-A-2-18451) and "a method for producing plate-like basic calcium carbonate" (JP-A-HEI-3).
-285816) was invented, and based on these findings, it was found that calcium carbonate, which has not been previously examined as a target for porous substances, can control its morphology by changing synthesis conditions. It is intended to obtain a spherical composite of plate-like calcium carbonate which can be used as a base material of a substance and whose pore diameter and pore volume can be changed depending on production conditions.
【０００４】[0004]
【課題を解決するための手段】そこで前記課題を解決す
るために本発明者らは鋭意検討を行った結果、本発明を
完成するに至った。すなわち、本発明の第１は、板状構
造を有した炭酸カルシウムの一次粒子が球状に凝集した
板状炭酸カルシウムの球状複合体であって、板状構造を
有した炭酸カルシウムである一次粒子の径が０．２〜１
０μｍ、厚さが０．０２〜２μｍであることが好まし
く、細孔容積が０．１〜３ｍｌ／ｇ以上であることが特
に好ましい。The inventors of the present invention have conducted extensive studies to solve the above problems, and as a result, have completed the present invention. That is, the first aspect of the present invention is a spherical composite of plate-like calcium carbonate in which primary particles of calcium carbonate having a plate-like structure are aggregated in a spherical shape, and the primary particles are calcium carbonate having a plate-like structure. Diameter is 0.2-1
The thickness is preferably 0 μm and the thickness is 0.02 to 2 μm, and the pore volume is particularly preferably 0.1 to 3 ml / g or more.
【０００５】本発明の第２は、板状構造を有した一次粒
子が、塩基性炭酸カルシウム、塩基性炭酸カルシウムと
炭酸カルシウムの複合物、炭酸カルシウムと水酸化カル
シウムの複合物、塩基性炭酸カルシウムと水酸化カルシ
ウムと炭酸カルシウムの複合物、が球状に凝集した板状
炭酸カルシウムの球状複合体を二酸化炭素と加熱下で接
触させ、塩基性炭酸カルシウム、塩基性炭酸カルシウム
と炭酸カルシウムの複合物、塩基性炭酸カルシウムと水
酸化カルシウムと炭酸カルシウムの複合物、を炭酸カル
シウムに変化させた板状炭酸カルシウムの球状複合体で
あって、板状構造を有した一次粒子の径が０．２〜１０
μｍ、厚さが０．０２〜２μｍである、塩基性炭酸カル
シウム、炭酸カルシウムまたは水酸化カルシウムである
ことが好ましく、細孔容積が０．１〜３ｍｌ／ｇ以上で
あることが特に好ましい。In the second aspect of the present invention, the primary particles having a plate-like structure are basic calcium carbonate, a complex of basic calcium carbonate and calcium carbonate, a complex of calcium carbonate and calcium hydroxide, and basic calcium carbonate. And calcium hydroxide-calcium carbonate composite, spherical spherical aggregates of plate-like calcium carbonate that are spherically aggregated are brought into contact with carbon dioxide under heating to form basic calcium carbonate, basic calcium carbonate-calcium carbonate composite, A spherical complex of plate-like calcium carbonate obtained by changing basic calcium carbonate, a complex of calcium hydroxide and calcium carbonate into calcium carbonate, wherein the primary particles having a plate-like structure have a diameter of 0.2 to 10
Basic calcium carbonate, calcium carbonate or calcium hydroxide having a thickness of μm and a thickness of 0.02 to 2 μm is preferable, and a pore volume of 0.1 to 3 ml / g or more is particularly preferable.
【０００６】本発明の第３は、水酸化カルシウム水懸濁
液（以下「石灰乳」という）と二酸化炭素を反応させて
水酸化カルシウムの炭酸化反応を行うにあたり、縮合リ
ン酸化合物の存在下、塩基性炭酸カルシウムが生成する
反応条件で、石灰乳の電気伝導度が反応前に対して２〜
１０ｍＳ／ｃｍ降下したときに炭酸化反応を止めること
および炭酸化反応を終了させることを特徴とする板状炭
酸カルシウムの球状複合体の製造方法である。The third aspect of the present invention is to react a calcium hydroxide aqueous suspension (hereinafter referred to as "lime milk") with carbon dioxide to carry out a carbonation reaction of calcium hydroxide in the presence of a condensed phosphoric acid compound. , The electric conductivity of lime milk is 2 to before the reaction under the reaction condition that basic calcium carbonate is generated.
A method for producing a spherical complex of plate-like calcium carbonate, which comprises stopping the carbonation reaction and terminating the carbonation reaction when the temperature drops by 10 mS / cm.
【０００７】本発明の第４は、石灰乳と二酸化炭素を反
応させて水酸化カルシウムの炭酸化反応を行うにあた
り、縮合リン酸化合物の存在下、塩基性炭酸カルシウム
が生成する反応条件で、石灰乳の電気伝導度が反応前に
対して２〜１０ｍＳ／ｃｍ降下したときに炭酸化反応を
止めた後、さらに縮合リン酸化合物および炭酸化率が７
０％以下の石灰乳を添加し、二酸化炭素を反応させるこ
とおよび炭酸化反応を終了させることを特徴とする板状
炭酸カルシウムの球状複合体の製造方法である。The fourth aspect of the present invention is that when lime milk is reacted with carbon dioxide to carry out the carbonation reaction of calcium hydroxide, the reaction conditions are such that basic calcium carbonate is produced in the presence of a condensed phosphoric acid compound. After the carbonation reaction was stopped when the electric conductivity of milk dropped by 2 to 10 mS / cm compared to before the reaction, the condensed phosphoric acid compound and the carbonation rate were further increased to 7%.
A method for producing a spherical complex of plate-like calcium carbonate, which comprises adding 0% or less of lime milk, reacting carbon dioxide and terminating the carbonation reaction.
【０００８】[0008]
【発明の実施の形態】本発明の板状炭酸カルシウムの球
状複合体は、図１に示したような板状構造を有した炭酸
カルシウムの単一結晶が一次粒子を形成し、図２に示す
ように層状に凝集して球状複合体を形成したり、または
図３に示すように放射状に凝集して球状複合体を形成し
て、表面に細孔を多数形成させた板状炭酸カルシウムの
球状複合体であって、その粒径は凡そ１〜１００μｍで
あって、３〜５０μｍのものが、使用上扱いやすく好ま
しい。BEST MODE FOR CARRYING OUT THE INVENTION In the spherical composite of plate-like calcium carbonate of the present invention, single crystals of calcium carbonate having a plate-like structure as shown in FIG. 1 form primary particles, and shown in FIG. To form a spherical composite by aggregating in a layered manner, or as shown in FIG. 3 to form a spherical composite by aggregating radially to form a spherical complex of plate-like calcium carbonate having a large number of pores formed on the surface. A composite having a particle size of about 1 to 100 μm and a particle size of 3 to 50 μm is preferable because it is easy to handle in use.
【０００９】本発明の細孔とは、板状炭酸カルシウムの
球状複合体における板状構造を有した炭酸カルシウムな
どの一次粒子間の間隙をいい、その細孔容積は水銀圧入
法により測定される。この場合、細孔容積が０．１ｍｌ
／ｇ未満であれば、粉体の粒子間隙であって細孔ではな
い。また、３ｍｌ／ｇを越えると板状炭酸カルシウムの
球状複合体の強度を保つことができず実用的ではない。
従って、水銀圧入法による細孔容積が０．１〜３ｍｌ／
ｇであることが好ましい。The pores of the present invention refer to the spaces between primary particles such as calcium carbonate having a plate-like structure in a spherical composite of plate-like calcium carbonate, and the pore volume thereof is measured by the mercury porosimetry method. . In this case, the pore volume is 0.1 ml
If it is less than / g, it is a gap between particles of the powder and not a pore. Further, if it exceeds 3 ml / g, the strength of the spherical composite of plate-like calcium carbonate cannot be maintained, which is not practical.
Therefore, the pore volume by the mercury injection method is 0.1 to 3 ml /
It is preferably g.
【００１０】本発明でいう複合物は、その複合形態や割
合によって物性が変わるものであって、例えば、Ｘ線回
折における解析や解析強度比によって異なり、示差熱分
析にあっては、複合形態や割合によってそれぞれの分解
温度により減量と熱量が示され、その値は複合割合によ
り決まる。The composites referred to in the present invention are those whose physical properties vary depending on their composite forms and proportions. For example, they differ depending on the analysis in X-ray diffraction and the analysis intensity ratio. Each decomposition temperature shows the weight loss and the amount of heat by the ratio, and the value is determined by the composite ratio.
【００１１】本発明でいう板状炭酸カルシウムの球状複
合体の製造方法において、水酸化カルシウム水懸濁液す
なわち石灰乳の濃度は１〜１５重量％、好ましくは３〜
１０重量％が望ましい。石灰乳の濃度が１重量％未満で
は基本構造である板状構造が生成でき難くなり、さらに
１５重量％を越えると均一な板状炭酸カルシウムの球状
複合体の生成が困難になる。In the method for producing a spherical composite of plate-like calcium carbonate according to the present invention, the concentration of calcium hydroxide aqueous suspension, that is, lime milk, is 1 to 15% by weight, preferably 3 to.
10% by weight is desirable. When the concentration of lime milk is less than 1% by weight, it becomes difficult to form a plate-like structure which is a basic structure, and when it exceeds 15% by weight, it becomes difficult to form a uniform plate-like calcium carbonate spherical complex.
【００１２】本発明でいう縮合リン酸化合物とは、通常
ポリリン酸化合物といわれる化合物で、ピロリン酸、ト
リポリリン酸、テトラポリリン酸、ヘキサメタリン酸、
ウルトラリン酸などを例示できるが、それらのナトリウ
ム、カリウムなどのアルカリ金属塩またはアンモニウム
塩であってもよい。これらは１種類で使用してもよい
し、また２種類以上併用してもよい。縮合リン酸化合物
の添加量は、水酸化カルシウムに対して０．０１〜１０
重量％、好ましくは０．１〜５重量％である。一般に縮
合リン酸化合物の添加量が水酸化カルシウムに対して１
０重量％を越えると、層状体または放射状体の板状炭酸
カルシウムの間隙幅が小さくなり、細孔容積も小さくな
り、本発明の目的を達成することはできない。一方、縮
合リン酸化合物の添加量が水酸化カルシウムに対して
０．０１重量％未満であると、板状炭酸カルシウムを層
状体または放射状体に凝集させることができず、本発明
の板状炭酸カルシウムの球状複合体の製造は困難とな
る。The condensed phosphoric acid compound referred to in the present invention is a compound usually called polyphosphoric acid compound, and is pyrophosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, hexametaphosphoric acid,
Ultraphosphoric acid and the like can be exemplified, but their alkali metal salts such as sodium and potassium, or ammonium salts may be used. These may be used alone or in combination of two or more. The amount of the condensed phosphoric acid compound added is 0.01 to 10 relative to calcium hydroxide.
% By weight, preferably 0.1 to 5% by weight. Generally, the amount of condensed phosphoric acid compound added is 1 with respect to calcium hydroxide.
If it exceeds 0% by weight, the gap width of the plate-like calcium carbonate in the layered body or the radial body becomes small and the pore volume becomes small, so that the object of the present invention cannot be achieved. On the other hand, if the amount of the condensed phosphoric acid compound added is less than 0.01% by weight with respect to the calcium hydroxide, the plate-shaped calcium carbonate cannot be aggregated into a layered body or a radial body, and the plate-shaped carbonate of the present invention cannot be aggregated. The production of a spherical complex of calcium becomes difficult.
【００１３】本発明でいう板状炭酸カルシウムの球状複
合体の製造方法においては、縮合リン酸化合物の存在
下、塩基性炭酸カルシウムが生成する反応条件で水酸化
カルシウムの炭酸化を行うことによって、基本構造であ
る板状構造を有する炭酸カルシウムを生成することがで
きる。生成した炭酸カルシウムの粒子の形状と電気伝導
度とは密接な関係があるので、電気伝導度を測定するこ
とにより炭酸カルシウムの生成を制御することができ
る。すなわち、電気伝導度の降下が２ｍＳ／ｃｍ未満で
あると、一次粒子である板状構造が充分に成長していな
い状態にあり、炭酸化率６０％以下であると、生成球状
複合体の均一性が損なわれる。また、電気伝導度の降下
が１０ｍＳ／ｃｍを越えると、一次粒子である板状構造
の間隙が少なく、細孔容積も少なくなり、炭酸化率も６
６．７％を越えることになる。In the method for producing a spherical composite of plate-like calcium carbonate according to the present invention, carbonation of calcium hydroxide is carried out in the presence of a condensed phosphoric acid compound under the reaction condition that basic calcium carbonate is produced. It is possible to produce calcium carbonate having a plate-like structure which is a basic structure. Since the shape of the particles of the generated calcium carbonate and the electric conductivity are closely related to each other, the generation of calcium carbonate can be controlled by measuring the electric conductivity. That is, when the decrease in electrical conductivity is less than 2 mS / cm, the plate-like structure which is the primary particle is in a state where it does not grow sufficiently, and when the carbonation rate is 60% or less, the formed spherical composite is uniform. Sex is impaired. When the decrease in electrical conductivity exceeds 10 mS / cm, the plate-like structure, which is the primary particle, has few gaps, the pore volume is small, and the carbonation rate is 6%.
It will exceed 6.7%.
【００１４】板状炭酸カルシウムの球状複合体の粒子径
を大きくし、複合体の粒度分布の幅が狭くなるように、
炭酸化反応を止めたのち、縮合リン酸化合物および炭酸
化率７０％以下の石灰乳を添加する。ここで炭酸化率と
は、乳液中の炭酸カルシウムのモル（ｍｏｌ）数と石灰
乳中のカルシウムのモル（ｍｏｌ）数の百分率であっ
て、数１で示される式によって計算された値である。In order to increase the particle size of the spherical composite of plate-like calcium carbonate and narrow the width of the particle size distribution of the composite,
After stopping the carbonation reaction, a condensed phosphoric acid compound and lime milk having a carbonation rate of 70% or less are added. Here, the carbonation rate is a percentage of the number of moles (mol) of calcium carbonate in the milky lotion and the number of moles (mol) of calcium in the lime milk, and is a value calculated by the formula shown in Formula 1. .
【００１５】[0015]
【数１】 [Equation 1]
【００１６】本発明でいう板状炭酸カルシウムの球状複
合体の製造方法において、縮合リン酸化合物の存在下で
水酸化カルシウムの炭酸化反応を行う場合、炭酸化反応
を止めた後、さらに縮合リン酸化合物および炭酸化率が
７０％以下の石灰乳を添加し、二酸化炭素を反応させる
ことを２回以上繰り返すことにより、板状炭酸カルシウ
ムの球状複合体の粒子径を大きく制御できると同時に粒
子径分布が狭くそろった板状炭酸カルシウムの複合体を
得ることができる。ここで炭酸化率は通常１０％未満で
あって、７０％を越えると板状炭酸カルシウムの球状複
合体の結晶成長に使用できる水酸化カルシウムの量が少
なくなり、球状複合体を成長させての粒子径制御ができ
難くなると同時に、成長した球状複合体の粒子径が不揃
いとなるので、好ましくない。繰り返し回数は通常２〜
１０回であるが、好ましくは２〜５回である。このとき
の反応温度は、１０〜４０℃程度の範囲、好ましくは２
０〜４０℃の範囲である。この反応温度を越えると、基
本構造である板状構造とならず本発明の目的を達成しな
い。縮合リン酸化合物の添加時期については、炭酸化前
から炭酸化率３０％、好ましくは炭酸化前から炭酸化率
２０％までに添加することが望ましい。これらの添加時
期を過ぎると、基本構造である板状構造の放射状または
層状の球状凝集体とならず本発明の目的を達成しない。
繰り返して炭酸化を行う場合、添加する石灰乳の混合割
合は、生成している炭酸カルシウムに対し、１０：１〜
１：１０、好ましくは４：１〜１：４が望ましい。生成
している炭酸カルシウムの混合割合が増加すると基本構
造の板状構造が均一に成長せず、放射状または層状の球
状凝集体と成り難く、さらに添加する石灰乳の混合割合
が増加すると基本構造の成長が大きく成りすぎるため
に、放射状または層状の球状凝集体の均一性がなくなり
本発明の目的を達成できない。In the method for producing a spherical composite of plate-like calcium carbonate according to the present invention, when carrying out the carbonation reaction of calcium hydroxide in the presence of a condensed phosphoric acid compound, after the carbonation reaction is stopped, the condensed phosphorus is further condensed. By adding an acid compound and lime milk having a carbonation rate of 70% or less and reacting carbon dioxide two or more times, the particle size of the spherical complex of plate-like calcium carbonate can be largely controlled and at the same time the particle size can be controlled. It is possible to obtain a plate-like calcium carbonate complex having a narrow distribution. Here, the carbonation rate is usually less than 10%, and if it exceeds 70%, the amount of calcium hydroxide that can be used for the crystal growth of the spherical composite of plate-like calcium carbonate becomes small, so that the spherical composite is grown. This is not preferable because it becomes difficult to control the particle size and the particle size of the grown spherical composite becomes uneven. The number of repetitions is usually 2
It is 10 times, but preferably 2 to 5 times. The reaction temperature at this time is in the range of about 10 to 40 ° C., preferably 2
It is in the range of 0 to 40 ° C. When the reaction temperature is exceeded, the plate-like structure which is the basic structure is not obtained and the object of the present invention is not achieved. Regarding the timing of addition of the condensed phosphoric acid compound, it is desirable to add the condensed phosphoric acid compound before the carbonation until the carbonation rate is 30%, preferably before the carbonation until the carbonation rate is 20%. If these addition times are exceeded, the object of the present invention will not be achieved since the basic structure does not become a radial or layered spherical aggregate having a plate-like structure.
When carbonation is repeatedly carried out, the mixing ratio of lime milk to be added is 10: 1 to the produced calcium carbonate.
It is preferably 1:10, preferably 4: 1 to 1: 4. When the mixing ratio of the generated calcium carbonate increases, the plate-shaped structure of the basic structure does not grow uniformly, it is difficult to form radial or layered spherical aggregates, and when the mixing ratio of lime milk to be added increases, the basic structure Since the growth becomes too large, the uniformity of the radial or layered spherical agglomerates is lost and the object of the present invention cannot be achieved.
【００１７】板状構造を有した一次粒子が、塩基性炭酸
カルシウム、塩基性炭酸カルシウムと炭酸カルシウムの
複合物、炭酸カルシウムと水酸化カルシウムの複合物、
塩基性炭酸カルシウムと水酸化カルシウムと炭酸カルシ
ウムの複合物、が球状に凝集した板状炭酸カルシウムの
球状複合体を二酸化炭素と加熱下で接触させ、塩基性炭
酸カルシウム、塩基性炭酸カルシウムと炭酸カルシウム
の複合物、塩基性炭酸カルシウムと水酸化カルシウムと
炭酸カルシウムの複合物、を炭酸カルシウムに変化させ
て板状炭酸カルシウムの球状複合体にする場合、この炭
酸化速度は、炭酸化温度、二酸化炭素濃度と反応時間に
より異なるが、固体と気体の直接反応は通常反応速度が
遅いので、塩基性炭酸カルシウムの分解温度以上または
水酸化カルシウムの分解温度以上で炭酸カルシウムの分
解温度以下で行うのが望ましい。すなわち、その温度は
３００〜８００℃、好ましくは４００〜７００℃であ
る。また、二酸化炭素の濃度は、１０〜１００容量％、
好ましくは５０〜１００容量％である。The primary particles having a plate-like structure include basic calcium carbonate, a complex of basic calcium carbonate and calcium carbonate, a complex of calcium carbonate and calcium hydroxide,
A spherical complex of plate-like calcium carbonate in which basic calcium carbonate, a complex of calcium hydroxide and calcium carbonate, are spherically aggregated is brought into contact with carbon dioxide under heating to form basic calcium carbonate, basic calcium carbonate and calcium carbonate. In the case of converting the above complex, a complex of basic calcium carbonate, calcium hydroxide, and calcium carbonate into calcium carbonate into a spherical complex of plate-like calcium carbonate, the carbonation rate depends on the carbonation temperature, carbon dioxide, and carbon dioxide. Although it depends on the concentration and the reaction time, the direct reaction between solid and gas usually has a slow reaction rate, so it is desirable to perform it at a temperature above the decomposition temperature of basic calcium carbonate or above the decomposition temperature of calcium hydroxide and below the decomposition temperature of calcium carbonate. . That is, the temperature is 300 to 800 ° C, preferably 400 to 700 ° C. The concentration of carbon dioxide is 10 to 100% by volume,
It is preferably 50 to 100% by volume.
【００１８】上述のごとくして、得られた板状炭酸カル
シウムの球状複合体は、従来の炭酸カルシウムや炭酸カ
ルシウム系複合体に比べて、比表面積が大きく、かつ粒
子表面が、図２および図３にみられるように、多孔質と
なっているので、その特性を利用した種々の用途を有し
ている。直接その物質を使用すると毒性など問題がある
場合、すなわち農薬などを本発明の板状炭酸カルシウム
の球状複合体に担持させることにより、任意の濃度に調
整し、かつ飛散を防ぐことができる。また、香料、消臭
剤などの揮発性の物質を担持させることにより、持続性
のある徐放剤として利用できる。例えば、触媒、医薬、
化粧料、農薬、微生物、過酸化物、植物成長剤、オレフ
ィン吸収剤、紫外線吸収剤、香料、芳香剤、消臭剤など
の各種物質の担持体として、利用することができ、この
とき吸着された物質をすみやかに放出することがないの
で、その徐放性を利用し、担持された物質の徐放剤とし
ての用途がある。さらに、物質の吸着性を利用して、乾
燥剤、吸液剤、防臭剤としての用途並びに塗料、シーラ
ント、接着剤、塩化ビニールペーストなどの増粘剤とし
ての用途がある。その他、濾過助剤、粉体の成形助剤お
よび吸液用成形体、潤滑油用キャリヤー、製紙用原料と
しても利用できる。As described above, the spherical composite of plate-like calcium carbonate thus obtained has a larger specific surface area than the conventional calcium carbonate or calcium carbonate-based composite, and the particle surface is as shown in FIG. 2 and FIG. As can be seen from No. 3, since it is porous, it has various applications utilizing its characteristics. When the substance is used directly, there is a problem such as toxicity, that is, by supporting an agricultural chemical or the like on the plate-like calcium carbonate spherical composite of the present invention, the concentration can be adjusted to an arbitrary concentration and scattering can be prevented. In addition, by supporting a volatile substance such as a fragrance and a deodorant, it can be used as a sustained release agent. For example, catalysts, drugs,
It can be used as a carrier for various substances such as cosmetics, agricultural chemicals, microorganisms, peroxides, plant growth agents, olefin absorbers, ultraviolet absorbers, fragrances, aromatics, deodorants, etc. Since it does not release the substance immediately, it has a use as a sustained release agent of the supported substance by utilizing its sustained release property. Further, by utilizing the adsorptivity of substances, it has applications as a desiccant, a liquid absorbent, a deodorant, and as a thickener for paints, sealants, adhesives, vinyl chloride pastes and the like. In addition, it can also be used as a filter aid, a powder forming aid and a liquid-absorbing molded product, a carrier for lubricating oil, and a raw material for papermaking.
【００１９】[0019]
【実施例】以下実施例にもとづいて、本発明を詳細に説
明するが、本発明はこれらのみに限定されるものではな
い。
（実施例１）６重量％で１５℃の石灰乳８００ｍｌを攪
拌しながら２５容量％の二酸化炭素ガス（以下単に「炭
酸ガス」という）を１２００ｍｌ／分で導入し、炭酸化
を行った。炭酸ガス導入開始と同時にヘキサメタリン酸
ナトリウム０．４８ｇを水２５ｍｌに溶解した液を石灰
乳に添加した。反応開始より５０分後に電気伝導度が反
応前より６．０ｍＳ／ｃｍ降下したので炭酸ガスの導入
を停止した。この時の石灰乳の炭酸化率は６１％であっ
た。この石灰乳から固形物を通常の方法で濾過し、アル
コール洗浄した後、１１０℃で１２時間乾燥した。この
乾燥固形物を粉末Ｘ線回折の結果、図４に示すとおりカ
ルサイトと塩基性炭酸カルシウムであり、走査型電子顕
微鏡観察の結果、厚さ０．２μｍ、粒子径３μｍの板状
構造をしたものが放射状に凝集し１０μｍの球状粒子を
形成していた。この乾燥品１００ｇを１０４μｍの篩を
通過させ、円筒形容器に充填し、５５０℃に加熱した縦
型電気炉に装着し、下部から１００％炭酸ガスを５０ｍ
ｌ／分で２０時間炭酸化を行った。炭酸化反応終了後の
Ｘ線回折の結果、図５に示すとおりカルサイトのみであ
り、他の結晶構造は認められなかった。走査型電子顕微
鏡観察の結果、厚さ０．２μｍ、粒子径３μｍの板状構
造をしたものが放射状に凝集し、約１０μｍの球状粒子
を形成していた。このものは水銀圧入法（以下同じ）に
よる細孔容積は０．８４ｍｌ／ｇであった。また、ＢＥ
Ｔ法による比表面積（以下同じ）は７ｍ2 ／ｇ、ＪＩＳ
Ｋ−６２２３によるＤＯＰ（フタル酸ジオクチル、以
下同じ）の吸油量（以下同じ）は９０ｍｌ／１００ｇで
あった。EXAMPLES The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited thereto. (Example 1) 25% by volume of carbon dioxide gas (hereinafter simply referred to as "carbon dioxide gas") was introduced at a rate of 1200 ml / min while stirring 800 ml of lime milk at 15 ° C at 6% by weight for carbonation. Simultaneously with the start of introduction of carbon dioxide gas, a solution prepared by dissolving 0.48 g of sodium hexametaphosphate in 25 ml of water was added to lime milk. After 50 minutes from the start of the reaction, the electric conductivity dropped 6.0 mS / cm from that before the reaction, so the introduction of carbon dioxide gas was stopped. At this time, the carbonation rate of the lime milk was 61%. A solid substance was filtered from this lime milk by a usual method, washed with alcohol, and then dried at 110 ° C. for 12 hours. As a result of powder X-ray diffraction, the dried solid substance was calcite and basic calcium carbonate as shown in FIG. 4. As a result of scanning electron microscope observation, a plate-like structure having a thickness of 0.2 μm and a particle diameter of 3 μm was formed. The particles were aggregated radially to form spherical particles of 10 μm. 100 g of this dried product was passed through a sieve of 104 μm, charged into a cylindrical container, and mounted in a vertical electric furnace heated to 550 ° C., and 100% carbon dioxide gas was supplied from the bottom to 50 m.
Carbonation was carried out at 1 / min for 20 hours. As a result of X-ray diffraction after the end of the carbonation reaction, as shown in FIG. 5, there was only calcite and no other crystal structure was observed. As a result of observation with a scanning electron microscope, a plate-shaped structure having a thickness of 0.2 μm and a particle diameter of 3 μm was aggregated radially to form spherical particles of about 10 μm. This product had a pore volume of 0.84 ml / g as determined by the mercury intrusion method (the same applies hereinafter). Also BE
Specific surface area according to T method (hereinafter the same) is 7 m 2 / g, JIS
The oil absorption of DOP (dioctyl phthalate; the same applies hereinafter) according to K-6223 was 90 ml / 100 g.
【００２０】（実施例２）６重量％で１５℃の石灰乳８
００ｍｌを攪拌しながら炭酸ガスを１２００ｍｌ／分で
導入し、炭酸化を行った。炭酸ガス導入開始１分前にヘ
キサメタリン酸ナトリウム０．４８ｇを水２５ｍｌに溶
解した液を石灰乳に添加した。反応開始より５０分後に
電気伝導度が反応前より４．３ｍＳ／ｃｍ降下したので
炭酸ガスの導入を停止した。この時の石灰乳の炭酸化率
は６５％でＡ液とした。６重量％で２０℃の石灰乳８０
０ｍｌを攪拌しながら炭酸ガスを１２００ｍｌ／分で導
入し、炭酸化を行った。炭酸ガス導入開始２分後にヘキ
サメタリン酸ナトリウム０．４８ｇを水２５ｍｌに溶解
した液を石灰乳に添加した。反応開始より３０分後に炭
酸ガスの導入を停止した。この石灰乳の炭酸化率は３４
％でＢ液とした。Ａ液８００ｍｌとＢ液８００ｍｌを混
合し、石灰乳温度を２５℃とし、攪拌しながら炭酸ガス
を２４００ｍｌ／分で導入した。反応開始より２０分後
に電気伝導度が反応前より６．５ｍＳ／ｃｍ降下したの
で、炭酸ガスの導入を停止し、石灰乳を濾過、アルコー
ル洗浄した後、１１０℃で１２時間乾燥した。この乾燥
品は、Ｘ線回折の結果、塩基性炭酸カルシウムと炭酸カ
ルシウムであり、走査型電子顕微鏡観察の結果、厚さ
０．２５μｍ、大きさ３μｍの板状構造をしたものが放
射状に凝集し、約１５μｍの球状粒子を形成していた。
この乾燥品１００ｇを１０４μｍの篩を通過させ、円筒
形容器に充填し、５５０℃に加熱した縦型電気炉に装着
し、下部から１００％炭酸ガスを５０ｍｌ／分で２０時
間炭酸化を行った。炭酸化反応終了後のＸ線回折の結果
は、カルサイトのみであり、他の結晶構造は認められな
かった。走査型電子顕微鏡の写真を図２に示した。観察
の結果、厚さ０．２５μｍ、粒子径３μｍの板状構造を
したものが放射状に凝集し、約１５μｍの球状粒子を形
成していた。このものの細孔容積は０．６７ｍｌ／ｇで
あった。また、比表面積は６ｍ2 ／ｇ、ＤＯＰの吸油量
は１１０ｍｌ／１００ｇであった。(Example 2) Lime milk at 6% by weight and 15 ° C. 8
Carbon dioxide was introduced at a rate of 1200 ml / min while stirring 00 ml to carry out carbonation. One minute before starting the introduction of carbon dioxide gas, a solution prepared by dissolving 0.48 g of sodium hexametaphosphate in 25 ml of water was added to lime milk. After 50 minutes from the start of the reaction, the electric conductivity dropped 4.3 mS / cm from that before the reaction, so the introduction of carbon dioxide gas was stopped. The carbonation rate of the lime milk at this time was 65%, and the solution was designated as A liquid. 80% lime milk at 20% at 6% by weight
Carbon dioxide was introduced by introducing carbon dioxide gas at 1200 ml / min while stirring 0 ml. Two minutes after the introduction of carbon dioxide gas, a solution prepared by dissolving 0.48 g of sodium hexametaphosphate in 25 ml of water was added to lime milk. The introduction of carbon dioxide was stopped after 30 minutes from the start of the reaction. The carbonation rate of this lime milk is 34
It was designated as solution B in%. Liquid A (800 ml) and liquid B (800 ml) were mixed, lime milk temperature was set to 25 ° C., and carbon dioxide gas was introduced at a rate of 2400 ml / min while stirring. After 20 minutes from the start of the reaction, the electric conductivity dropped by 6.5 mS / cm from before the reaction, so the introduction of carbon dioxide was stopped, the lime milk was filtered, washed with alcohol, and then dried at 110 ° C. for 12 hours. As a result of X-ray diffraction, this dried product was basic calcium carbonate and calcium carbonate. As a result of observation by a scanning electron microscope, a plate-like structure having a thickness of 0.25 μm and a size of 3 μm was aggregated radially. , Spherical particles of about 15 μm were formed.
100 g of this dried product was passed through a 104 μm sieve, charged into a cylindrical container, and mounted in a vertical electric furnace heated to 550 ° C., and 100% carbon dioxide gas was carbonized from the bottom at 50 ml / min for 20 hours. . The result of X-ray diffraction after the end of the carbonation reaction was only calcite, and no other crystal structure was observed. A photograph of the scanning electron microscope is shown in FIG. As a result of the observation, a plate-like structure having a thickness of 0.25 μm and a particle size of 3 μm was aggregated radially to form spherical particles of about 15 μm. The pore volume of this product was 0.67 ml / g. The specific surface area was 6 m 2 / g, and the DOP oil absorption was 110 ml / 100 g.
【００２１】（実施例３）６重量％で２０℃の石灰乳８
００ｍｌを攪拌しながら炭酸ガスを１２００ｍｌ／分で
導入し、炭酸化を行った。炭酸ガス導入と同時にピロリ
ン酸ナトリウム０．５６ｇを水２５ｍｌに溶解した液を
石灰乳に添加した。反応開始より８５分で石灰乳のｐＨ
が７．０になったので炭酸ガスの導入を停止し、石灰乳
を濾過し、アルコール洗浄した後、１１０℃で１２時間
乾燥した。この乾燥品は、粉末Ｘ線回折の結果、すべて
がカルサイトであり、走査型電子顕微鏡観察の結果、厚
さ０．２μｍ、粒子径３μｍの板状構造をしたものが放
射状に凝集し、約１０μｍの球状粒子を形成していた。
このものの細孔容積は０．７９ｍｌ／ｇ、比表面積は約
１０ｍ2 ／ｇ、ＤＯＰの吸油量は６０ｍｌ／１００ｇで
あった。(Example 3) 6% by weight of lime milk at 20 ° C. 8
Carbon dioxide was introduced at a rate of 1200 ml / min while stirring 00 ml to carry out carbonation. Simultaneously with introduction of carbon dioxide gas, a solution prepared by dissolving 0.56 g of sodium pyrophosphate in 25 ml of water was added to lime milk. PH of lime milk in 85 minutes from the start of reaction
Became 7.0, the introduction of carbon dioxide gas was stopped, lime milk was filtered, washed with alcohol, and then dried at 110 ° C. for 12 hours. As a result of powder X-ray diffraction, all of this dried product was calcite. As a result of observation by a scanning electron microscope, a plate-like structure having a thickness of 0.2 μm and a particle diameter of 3 μm was aggregated radially, Spherical particles of 10 μm were formed.
This product had a pore volume of 0.79 ml / g, a specific surface area of about 10 m 2 / g, and an oil absorption amount of DOP of 60 ml / 100 g.
【００２２】（実施例４）実施例２のＡ液４００ｍｌに
ヘキサメタリン酸ナトリウム０．１８ｇを含む６重量％
の石灰乳（以下「Ｃ液」という）４００ｍｌを注加し、
石灰乳温度２０℃に調整後、炭酸ガスを６００ｍｌ／分
で導入し、４５分後に電気伝導度が反応前より７．０ｍ
Ｓ／ｃｍ降下したので、炭酸ガスの導入を停止した。こ
の石灰乳４００ｍｌに新たにＣ液４００ｍｌを注加し、
上記の条件下で炭酸化を行い、同様に電気伝導度が反応
前より７．０ｍＳ／ｃｍ降下した時点で炭酸ガスの導入
を停止した。このような反応を５回繰り返したところ、
この石灰乳の炭酸化率は６９％であり、この石灰乳を濾
過し、アルコール洗浄した後、１１０℃で１２時間乾燥
した。この乾燥品は、粉末Ｘ線回折の結果、図６に示す
とおりカルサイト、塩基性炭酸カルシウムおよび消石灰
であり、走査型電子顕微鏡観察の結果、厚さ０．３μ
ｍ、粒子径３．５μｍの板状構造をしたものが放射状に
凝集し、約２７μｍの球状粒子を形成していた。この乾
燥品１００ｇを１０４μｍの篩を通過させ、円筒形容器
に充填し、５５０℃に加熱した縦型電気炉に装着し、下
部から１００％炭酸ガスを１００ｍｌ／分で２０時間炭
酸化を行った。炭酸化反応終了後のＸ線回折の結果、カ
ルサイトのみであり、他の結晶構造は認められなかっ
た。走査型電子顕微鏡観察の結果、厚さ０．３μｍ、粒
子径３．５μｍの板状構造をしたものが放射状に凝集
し、約２７μｍの球状粒子を形成していた。(Example 4) 400 wt. A of Example 2 containing 6% by weight of sodium hexametaphosphate (0.18 g)
400 ml of lime milk (hereinafter referred to as "C liquid") was added,
After adjusting the lime milk temperature to 20 ° C, carbon dioxide gas was introduced at 600 ml / min, and after 45 minutes, the electric conductivity was 7.0 m from before the reaction.
Since the S / cm dropped, the introduction of carbon dioxide gas was stopped. 400 ml of C liquid was newly added to 400 ml of this lime milk,
Carbonation was carried out under the above conditions, and the introduction of carbon dioxide gas was stopped when the electric conductivity dropped 7.0 mS / cm from before the reaction. When such a reaction was repeated 5 times,
The carbonation rate of this lime milk was 69%, and this lime milk was filtered, washed with alcohol, and then dried at 110 ° C. for 12 hours. As a result of powder X-ray diffraction, this dried product was calcite, basic calcium carbonate and slaked lime as shown in FIG. 6. As a result of observation with a scanning electron microscope, the thickness was 0.3 μm.
m having a plate-like structure with a particle diameter of 3.5 μm was aggregated radially to form spherical particles of about 27 μm. 100 g of this dried product was passed through a sieve of 104 μm, filled in a cylindrical container, and mounted in a vertical electric furnace heated to 550 ° C., and 100% carbon dioxide gas was carbonized from the bottom at 100 ml / min for 20 hours. . As a result of X-ray diffraction after the end of the carbonation reaction, only calcite was observed and no other crystal structure was observed. As a result of scanning electron microscope observation, a plate-like structure having a thickness of 0.3 μm and a particle diameter of 3.5 μm was aggregated radially to form spherical particles of about 27 μm.
【００２３】（実施例５）６重量％で１５℃の石灰乳１
６００ｍｌを攪拌しながら、２５容量％の炭酸ガスを３
６００ｍｌ／分で導入し、炭酸化を行った。炭酸ガス導
入開始と同時にヘキサメタリン酸ナトリウム０．９６ｇ
を水５０ｍｌに溶解した液を添加した。反応開始より４
０分後に電気伝導度が反応前より４．１ｍＳ／ｃｍ降下
したので、炭酸ガスの導入を停止した。このときの乳液
の炭酸化率は６５％であった。この乳液から固形物を通
常の方法で濾過し、アルコール洗浄した後、１１０℃で
１２時間乾燥した。この乾燥固形物を粉末Ｘ線回折の結
果、カルサイトと塩基性炭酸カルシウムであり、走査型
電子顕微鏡観察の結果、厚さ０．１５μｍ、粒子径１μ
ｍの板状構造をしたものが、放射状に凝集し、５μｍの
球状粒子を形成していた。この乾燥品１００ｇを１０４
μｍの篩を通過させ、円筒形容器に充填し、５５０℃に
加熱した縦型電気炉に装着し、下部から１００％炭酸ガ
スを１００ｍｌ／分で２０時間炭酸化を行った。炭酸化
反応終了後のＸ線回折の結果、カルサイトのみであり、
他の結晶構造は認められなかった。走査型電子顕微鏡観
察の結果、厚さ０．１５μｍ、粒子径１μｍの板状構造
をしたものが、放射状に凝集し、約５μｍの球状粒子を
形成していた。このものは、細孔容積０．６ｍｌ／ｇで
あった。また、ＢＥＴ法による比表面積は、５ｍ2 ／
ｇ、ＤＯＰも吸油量は６０ｍｌ／１００ｇであった。(Embodiment 5) Lime milk at 6% by weight and 15 ° C. 1
While stirring 600 ml, 25% by volume of carbon dioxide gas was added to 3
It was introduced at a rate of 600 ml / min to perform carbonation. Sodium hexametaphosphate 0.96g at the same time as the introduction of carbon dioxide
Was dissolved in 50 ml of water and added. 4 from the start of the reaction
After 0 minutes, the electrical conductivity dropped 4.1 mS / cm from before the reaction, so the introduction of carbon dioxide gas was stopped. The carbonation rate of the emulsion at this time was 65%. A solid substance was filtered from this emulsion by a usual method, washed with alcohol, and then dried at 110 ° C. for 12 hours. As a result of powder X-ray diffraction, the dried solid substance was calcite and basic calcium carbonate. As a result of scanning electron microscope observation, the thickness was 0.15 μm and the particle diameter was 1 μm.
Those having a plate-like structure of m were radially aggregated to form spherical particles of 5 μm. 104 g of this dried product
After passing through a sieve of μm, the mixture was filled in a cylindrical container, mounted in a vertical electric furnace heated at 550 ° C., and 100% carbon dioxide gas was carbonized from the bottom at 100 ml / min for 20 hours. As a result of X-ray diffraction after completion of the carbonation reaction, only calcite was found,
No other crystal structure was observed. As a result of scanning electron microscope observation, a plate-shaped structure having a thickness of 0.15 μm and a particle size of 1 μm was aggregated radially to form spherical particles of about 5 μm. This had a pore volume of 0.6 ml / g. The specific surface area by the BET method is 5 m 2 /
The oil absorption of g and DOP was 60 ml / 100 g.
【００２４】[0024]
【発明の効果】本発明の製造条件によって、石灰乳と二
酸化炭素の反応により生成される炭酸カルシウムは、板
状構造を有した炭酸カルシウムの一次粒子が球状に凝集
した比表面積が大きく、多孔質である板状炭酸カルシウ
ムの球状複合体であって、一次粒子間に間隙を有するた
め、直接その物質を使用すると問題がある場合、すなわ
ち農薬などを本発明の板状炭酸カルシウムの球状複合体
に担持させることにより、任意の濃度に調整し、かつ飛
散を防ぐことができる。また、香料、消臭剤などの揮発
性の物質を担持させることにより、持続性のある徐放剤
として利用できる。さらに、物質の吸着性を利用して、
乾燥剤、吸液剤、防臭剤としての用途並びに塗料、シー
ラント、接着剤、塩化ビニールペーストなどの増粘剤と
しての用途があり、その他、濾過助剤、粉体の成形助剤
および吸液用成形体、潤滑油用キャリヤー、製紙用原料
としても利用できる。According to the production conditions of the present invention, calcium carbonate produced by the reaction between lime milk and carbon dioxide has a large specific surface area in which primary particles of calcium carbonate having a plate-like structure are aggregated into a spherical shape and is porous. Is a spherical complex of plate-like calcium carbonate, and since there is a gap between the primary particles, there is a problem in using the substance directly, that is, an agricultural chemical or the like is added to the plate-like calcium carbonate spherical complex of the present invention. By carrying it, it is possible to adjust the concentration to an arbitrary value and prevent scattering. In addition, by supporting a volatile substance such as a fragrance and a deodorant, it can be used as a sustained release agent. Furthermore, utilizing the adsorptivity of substances,
It is used as a desiccant, liquid absorbent, deodorant, and as a thickening agent for paints, sealants, adhesives, vinyl chloride paste, etc., as well as other filter aids, powder molding aids and liquid absorbing moldings. It can also be used as a body, a carrier for lubricating oil, and a raw material for papermaking.
【図１】板状構造をした炭酸カルシウムFIG. 1 Calcium carbonate having a plate-like structure
【図２】層状に凝集した球状複合体FIG. 2 Spherical composite aggregated in layers
【図３】放射状に凝集した球状複合体FIG. 3 Radially aggregated spherical composites
【図４】実施例１におけるカルサイトと塩基性炭酸カル
シウムのＸ線回折FIG. 4 X-ray diffraction analysis of calcite and basic calcium carbonate in Example 1
【図５】実施例１におけるカルサイトのＸ線回折FIG. 5: X-ray diffraction of calcite in Example 1
【図６】実施例４におけるカルサイト、塩基性炭酸カル
シウムおよび水酸化カルシウムのＸ線回折FIG. 6 X-ray diffraction analysis of calcite, basic calcium carbonate and calcium hydroxide in Example 4.
Ａ．板状構造を有した炭酸カルシウムの一次粒子 １．板状構造を有した炭酸カルシウムの単一結晶 A. Primary particles of calcium carbonate with plate-like structure 1. Single crystal of calcium carbonate with plate-like structure
フロントページの続き (72)発明者 森 一晃 大分県津久見市上宮本町10番21号 (72)発明者 水口 正昭 大阪府大阪市東淀川区井高野２丁目１番37 号 鈴木油脂工業株式会社内Continued front page (72) Inventor Kazuaki Mori 10-21 Uemiyahonmachi, Tsukumi City, Oita Prefecture (72) Inventor Masaaki Mizuguchi 2-3-1 Itakano, Higashiyodogawa-ku, Osaka-shi, Osaka Prefecture No. Suzuki Oil & Fat Co., Ltd.
Claims (8)
子が球状に凝集した板状炭酸カルシウムの球状複合体。1. A spherical composite of plate-like calcium carbonate in which primary particles of calcium carbonate having a plate-like structure are aggregated in a spherical shape.
次粒子の径が０．２〜１０μｍ、厚さが０．０２〜２μ
ｍである請求項１記載の板状炭酸カルシウムの球状複合
体。2. The primary particles, which are calcium carbonate having a plate-like structure, have a diameter of 0.2 to 10 μm and a thickness of 0.02 to 2 μm.
The spherical composite of plate-like calcium carbonate according to claim 1, which is m.
請求項１または２記載の板状炭酸カルシウムの球状複合
体。3. The spherical composite of plate-like calcium carbonate according to claim 1, which has a pore volume of 0.1 to 3 ml / g or more.
カルシウム、塩基性炭酸カルシウムと炭酸カルシウムの
複合物、炭酸カルシウムと水酸化カルシウムの複合物、
塩基性炭酸カルシウムと水酸化カルシウムと炭酸カルシ
ウムの複合物、が球状に凝集した板状炭酸カルシウムの
球状複合体を二酸化炭素と加熱下で接触させ、塩基性炭
酸カルシウム、塩基性炭酸カルシウムと炭酸カルシウム
の複合物、塩基性炭酸カルシウムと水酸化カルシウムと
炭酸カルシウムの複合物、を炭酸カルシウムに変化させ
た板状炭酸カルシウムの球状複合体。4. The primary particles having a plate-like structure are basic calcium carbonate, a composite of basic calcium carbonate and calcium carbonate, a composite of calcium carbonate and calcium hydroxide,
A spherical complex of plate-like calcium carbonate in which basic calcium carbonate, a complex of calcium hydroxide and calcium carbonate, are spherically aggregated is brought into contact with carbon dioxide under heating to form basic calcium carbonate, basic calcium carbonate and calcium carbonate. A spheroidal complex of plate-like calcium carbonate obtained by changing the complex of the above, a complex of basic calcium carbonate, calcium hydroxide and calcium carbonate, into calcium carbonate.
１０μｍ、厚さが０．０２〜２μｍである、塩基性炭酸
カルシウム、炭酸カルシウムまたは水酸化カルシウムで
ある請求項４記載の板状炭酸カルシウムの球状複合体。5. The diameter of primary particles having a plate-like structure is 0.2 to
The spherical complex of plate-like calcium carbonate according to claim 4, which is basic calcium carbonate, calcium carbonate or calcium hydroxide having a thickness of 10 μm and a thickness of 0.02 to 2 μm.
請求項４または５記載の板状炭酸カルシウムの球状複合
体。6. The spherical complex of plate-like calcium carbonate according to claim 4, wherein the pore volume is 0.1 to 3 ml / g or more.
乳」という）と二酸化炭素を反応させて水酸化カルシウ
ムの炭酸化反応を行うにあたり、縮合リン酸化合物の存
在下、塩基性炭酸カルシウムが生成する反応条件で、石
灰乳の電気伝導度が反応前に対して２〜１０ｍＳ／ｃｍ
降下したときに炭酸化反応を止めることおよび炭酸化反
応を終了させることを特徴とする板状炭酸カルシウムの
球状複合体の製造方法。7. Basic calcium carbonate in the presence of a condensed phosphoric acid compound in the case of reacting an aqueous suspension of calcium hydroxide (hereinafter referred to as "lime milk") with carbon dioxide to carry out a carbonation reaction of calcium hydroxide. Under the reaction conditions in which is generated, the electric conductivity of lime milk is 2 to 10 mS / cm compared to before the reaction.
A method for producing a spherical complex of plate-like calcium carbonate, which comprises stopping the carbonation reaction when it is lowered and terminating the carbonation reaction.
ルシウムの炭酸化反応を行うにあたり、縮合リン酸化合
物の存在下、塩基性炭酸カルシウムが生成する反応条件
で、石灰乳の電気伝導度が反応前に対して２〜１０ｍＳ
／ｃｍ降下したときに炭酸化反応を止めた後、さらに縮
合リン酸化合物および炭酸化率が７０％以下の石灰乳を
添加し、二酸化炭素を反応させることおよび炭酸化反応
を終了させることを特徴とする板状炭酸カルシウムの球
状複合体の製造方法。8. The electrical conductivity of lime milk under the reaction conditions in which basic calcium carbonate is produced in the presence of a condensed phosphoric acid compound in the reaction of lime milk with carbon dioxide to carry out the carbonation reaction of calcium hydroxide. Is 2-10mS before reaction
After stopping the carbonation reaction when the temperature has dropped by 1 cm / cm, a condensed phosphoric acid compound and lime milk having a carbonation rate of 70% or less are further added to react carbon dioxide and terminate the carbonation reaction. And a method for producing a spherical composite of plate-shaped calcium carbonate.
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| JP22003796A Division JP3376826B2 (en) | 1996-08-21 | 1996-08-21 | Plate-like calcium carbonate-based spherical composite and method for producing the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006011661A1 (en) * | 2004-07-29 | 2006-02-02 | New Lime Kenkyusha Co Inc. | Cosmetic composition |
| JP2007500672A (en) * | 2003-05-29 | 2007-01-18 | スペシャルティ ミネラルズ （ミシガン） インク． | Synthesis of plate-like precipitated calcium carbonate |
| JP5279844B2 (en) * | 2008-12-26 | 2013-09-04 | アズマ工業株式会社 | Oil adsorbing structure and cooking utensil using the same |
| JP2016153354A (en) * | 2015-02-20 | 2016-08-25 | 古手川産業株式会社 | Calcium carbonate complex |
| JP2017517385A (en) * | 2014-04-16 | 2017-06-29 | オムヤ インターナショナル アーゲー | Adsorption of organic materials in aqueous media and / or reduction of the amount of organic materials in aqueous media by using colloidal precipitated calcium carbonate |
-
2002
- 2002-06-13 JP JP2002172585A patent/JP3843892B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007500672A (en) * | 2003-05-29 | 2007-01-18 | スペシャルティ ミネラルズ （ミシガン） インク． | Synthesis of plate-like precipitated calcium carbonate |
| WO2006011661A1 (en) * | 2004-07-29 | 2006-02-02 | New Lime Kenkyusha Co Inc. | Cosmetic composition |
| JP5279844B2 (en) * | 2008-12-26 | 2013-09-04 | アズマ工業株式会社 | Oil adsorbing structure and cooking utensil using the same |
| JP2017517385A (en) * | 2014-04-16 | 2017-06-29 | オムヤ インターナショナル アーゲー | Adsorption of organic materials in aqueous media and / or reduction of the amount of organic materials in aqueous media by using colloidal precipitated calcium carbonate |
| JP2019048296A (en) * | 2014-04-16 | 2019-03-28 | オムヤ インターナショナル アーゲー | Adsorption of organic material in aqueous medium and/or reduction of the amount of organic material in aqueous medium by using colloidal precipitated calcium carbonate |
| JP2016153354A (en) * | 2015-02-20 | 2016-08-25 | 古手川産業株式会社 | Calcium carbonate complex |
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| Publication number | Publication date |
|---|---|
| JP3843892B2 (en) | 2006-11-08 |
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