JP3696993B2 - Method for producing titanium dioxide pigment - Google Patents
Method for producing titanium dioxide pigment Download PDFInfo
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- JP3696993B2 JP3696993B2 JP28737096A JP28737096A JP3696993B2 JP 3696993 B2 JP3696993 B2 JP 3696993B2 JP 28737096 A JP28737096 A JP 28737096A JP 28737096 A JP28737096 A JP 28737096A JP 3696993 B2 JP3696993 B2 JP 3696993B2
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- titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
- C09C1/3661—Coating
Description
【０００１】
【発明の属する技術分野】
本発明は、水性分散体用の二酸化チタン顔料の製造方法に関する。
【０００２】
【従来の技術】
塗料分野においては、地球環境の安全や作業環境の安全、衛生面、さらには省資源化などへの対応ともあいまって、水性溶媒系塗料への指向がいっそう強まってきている。
【０００３】
ところで、水性溶媒系塗料、とりわけエマルション塗料は、常乾型のものが多く、また臭気、火気への安全性に優れ、かつ塗装作業性が良好であるなど多くの特長を有しているところから、今日、工業用や家庭用の塗料として種々の適用分野において多量に使用されている。
【０００４】
しかして、エマルション塗料は、基本的には主要構成成分であるビヒクルの合成樹脂エマルションに顔料を配合、分散させたものであるが、この分散過程で強い機械的衝撃を受けるとエマルション系が破壊されて安定性を失いやすく、溶剤型ビヒクル系塗料のように強力な剪断力下での分散処理が困難である場合が少なくない。このため通常、種々の分散剤や増粘剤などの存在下に水性媒体中に二酸化チタン顔料のほか、体質顔料などを懸濁、分散させて高濃度顔料スラリーを調製し、該顔料スラリーを樹脂エマルションに添加して塗料化することが行われている。
【０００５】
【発明が解決しようとする課題】
しかしながら、前記分散剤は、分散作業性を改善する上で有用なものではあるが、反面例えば塗膜の耐水性などの塗膜物性を損なったり、また二酸化チタン顔料の分散性付与には有用であっても体質顔料の分散性を損ない易かったりするなど、改善を要する問題点も少なくない。このため分散剤の不存在下もしくは添加量を極力少なくし得るような易分散性顔料、とりわけ主要構成成分である二酸化チタン顔料について強く希求されている。
従来、易分散性二酸化チタン顔料を得るために二酸化チタン顔料粒子表面にシリカを被覆処理することが試みられてきた。この処理方法においては、シリカ被覆二酸化チタン顔料を含むスラリーやケーキのチキソトロピック粘性により、濾過、洗浄工程等における取扱い作業が困難になり生産効率の低下を来すという問題点があった。
【０００６】
【課題を解決するための手段】
本発明者等は、前記二酸化チタン顔料粒子表面へのシリカ被覆処理の問題点についてその解決を図るべく、検討を重ねた結果、極めて多孔質なシリカを酸性側から急激に二酸化チタン粒子表面に処理することで、前記の取扱い作業の困難性や生産効率の低下などを実質的に回避しうることの知見を得、本発明を完成したものである。
【０００７】
すなわち本発明は、
１．二酸化チタン顔料の水性スラリーのｐＨを１〜４に保持しながらケイ酸塩と酸を添加し、その後アルカリを添加して多孔質シリカを被覆することを特徴とする二酸化チタン顔料の製造方法、
２．前記１．の多孔質シリカの被覆処理後、ポリオール化合物、アミン系化合物、カルボン酸系化合物を単独もしくは複合して被覆処理することを特徴とする二酸化チタン顔料の製造方法である。
【０００８】
本発明に用いる二酸化チタンは、たとえば硫酸チタン溶液を加水分解し、得られた含水酸化チタンを焼成するいわゆる硫酸法や、ハロゲン化チタンを気相酸化するいわゆる塩素法で製造されたものを用いることができ、その電子顕微鏡写真法による一次粒子の平均粒子径は０．１〜１．０μｍ程度のものであって、その結晶形はアナタース型、ルチル型のいずれでもよく、さらにアナタース型二酸化チタンとルチル型二酸化チタンとの混合物でもよい。尚、前記硫酸法の二酸化チタンにあっては、その製造工程でたとえば亜鉛、カリウム、アルミニウム、リチウム、ニオブ、マグネシウムなどの金属またはリンなどの化合物を焼成処理剤として添加することもでき、また塩素法二酸化チタンにあっては、その製造工程における四塩化チタンの酸化過程でたとえばアルミニウム、カリウムなどの化合物を処理剤として添加してもよい。
【０００９】
本発明において、二酸化チタン粒子表面に多孔質シリカの被覆層を形成するには、まず、二酸化チタンの水性スラリーを調製する。スラリーの濃度は普通１００〜６００ｇ／ｌ、望ましくは２００〜４００ｇ／ｌである。
【００１０】
このスラリーはアルカリ化合物たとえば水酸化ナトリウム、水酸化カリウム、アンモニアなどによりｐＨを９以上に調製するのがよい。また、このスラリーに必要に応じ適当な分散剤たとえばリン酸塩、ケイ酸塩、ポリアクリル酸塩などを添加して二酸化チタンの分散をよくすることができる。リン酸塩としてヘキサメタリン酸ナトリウム、ピロリン酸ナトリウムなどを使用するときは、普通二酸化チタンに対し０．０１〜３％（Ｐ換算重量％）が望ましい添加量である。
【００１１】
次に、二酸化チタンの水性スラリーに対して酸たとえば硫酸、塩酸、硝酸、リン酸、酢酸などを添加して該スラリーのｐＨを１〜４、望ましくはｐＨ２〜３に調整する。
【００１２】
次に、二酸化チタンの水性スラリーに対してｐＨを１〜４、望ましくは２〜３に保持しながらケイ酸塩及び酸を添加し、次いでアルカリで中和して多孔質シリカの被覆層を形成する。ケイ酸塩としては、ケイ酸ナトリウム、ケイ酸カリウムなどの種々のケイ酸塩およびその他のケイ素化合物を使用することができる。特に水ガラスが好ましいものの一つである。二酸化チタン粒子表面に被覆する多孔質シリカの被覆量は、二酸化チタンの重量に対してSiO2として１〜１０重量％、望ましくは２〜５重量％であり、前記範囲より少なすぎると生産性の低下をきたす等の所望の効果が得られず、また、多すぎると経済的に有利でないばかりか塗膜光沢が損なわれやすかったりする。
【００１３】
ケイ酸塩は、予めその添加前に必要に応じて所定濃度になるように水または弱アルカリ水溶液で希釈し、所定量を添加する。中和時の二酸化チタン分散液の温度は適宜設定できるが、通常室温から９０℃が適当である。
【００１４】
本発明においては、次に前記被覆処理スラリーを濾過、洗浄、乾燥し、粉砕処理して、表面被覆処理された二酸化チタン顔料として回収する。具体的には、中和反応後のスラリーは、一定時間、普通１０〜６０分間、４０〜９０℃の温度で熟成後公知の方法に従って分別し、洗浄し、乾燥し、必要に応じて乾式粉砕などの工程を経て二酸化チタン顔料製品とする。この乾燥後の乾式粉砕は、通常ジェットミルやマイクロナイザーなどの気流粉砕機、ローラーミル、パルペライザーなどで行う。
【００１５】
なお、前記のようにして得られた二酸化チタン顔料は、必要に応じ種々の有機物を表面処理することもできる。前記有機物としては、種々のものを使用し得るが、たとえばポリオール系、アミン系、カルボン酸系のものがあり、具体例としては例えばトリメチロールメタン、トリメチロールエタン、トリメチロールプロパン、ペンタエリスリトール、ジメチルエタノールアミン、トリエタノールアミン、ステアリン酸、オレイン酸などが挙げられる。これらの添加量は、水性塗料系での例えば耐水性などの塗膜性能を損なわない範囲でなるべく少量であるのが望ましい。
【００１６】
【実施例】
実施例１
四塩化チタンを気相で酸化して得られた二酸化チタンを粉砕し、分級してTiO2濃度３００ｇ／ｌの水性スラリーとし、水酸化ナトリウム水溶液を添加してスラリーｐＨを１０．５とした後、３０分間超音波分散を行った。次に該スラリー４０００ｍｌに硫酸を添加してｐＨを２に調製した。次いで攪拌下に、水性スラリーのｐＨを２に保持しながら、水ガラス（ＪＩＳ３号）水溶液（SiO2換算で１５０ｇ／ｌ）３２０ｍｌを硫酸と共に添加した。次いで２Ｎの水酸化ナトリウム水溶液を約１ｍｌ／分の速度で６０分間添加して、ｐＨが８となるまで中和した。その後硫酸でｐＨを７に調整し、攪拌下に６０分間熟成し、二酸化チタンスラリー（スラリーＡ）を得た。
次にこのスラリーを濾過、水洗、乾燥、粉砕して多孔質シリカの被覆層を有する二酸化チタン顔料（試料Ａ）を得た。
【００１７】
比較例１
四塩化チタンを気相で酸化して得られた二酸化チタンを粉砕し、分級してTiO２濃度３００ｇ／ｌの水性スラリーとし、水酸化ナトリウム水溶液を添加してスラリーｐＨを１０．５とした後、３０分間超音波分散を行った。該スラリー４０００ｍｌに水ガラス（ＪＩＳ３号）水溶液（SiO2換算で１５０ｇ／ｌ）３２０ｍｌを攪拌しながら添加した。次いで硫酸をｐＨ＝５〜５．５になるまで添加し、攪拌下に６０分間熟成し、比較例の二酸化チタンスラリー（スラリーＢ）を得た。
次にこのスラリーを濾過、水洗、乾燥、粉砕して高密度シリカの被覆層を有する二酸化チタン顔料（試料Ｂ）を得た。
【００１８】
比較例２
四塩化チタンを気相で酸化して得られた二酸化チタンを粉砕し、分級してTiO２濃度３００ｇ／ｌの水性スラリーとし、水酸化ナトリウム水溶液を添加してスラリーｐＨを１０．５とした後、３０分間超音波分散を行った。該スラリー４０００ｍｌに硫酸を添加してｐＨを６〜７に調整した後、水ガラス（ＪＩＳ３号）水溶液（SiO2換算で１５０ｇ／ｌ）３２０ｍｌと硫酸をｐＨ＝６〜７に維持しながら添加し、攪拌下に６０分間熟成し、比較例の二酸化チタンスラリー（スラリーＣ）を得た。
次にこのスラリーを濾過、水洗、乾燥、粉砕して低密度（多孔質）シリカの被覆層を有する二酸化チタン顔料（試料Ｃ）を得た。
【００１９】
比較例３
四塩化チタンを気相で酸化して得られた二酸化チタンを粉砕し、分級してTiO2濃度３００ｇ／ｌの水性スラリーとし、水酸化ナトリウム水溶液を添加してスラリーｐＨを１０．５とした後、３０分間超音波分散を行った。該スラリー４０００ｍｌに硫酸を添加してｐＨを６〜７に調整した後、アルミン酸ソーダ水溶液（Al2O3 換算で２００ｇ／ｌ）２４０ｍｌと硫酸をｐＨ＝６〜７に維持しながら添加し、攪拌下に６０分間熟成し、比較例の二酸化チタンスラリー（スラリーＤ）を得た。
次にこのスラリーを濾過、水洗、乾燥、粉砕してアルミナの被覆層を有する二酸化チタン顔料（試料Ｄ）を得た。
【００２０】
次に下記試験をおこなった。
試験例１
実施例ならびに比較例の各スラリーをブフナー漏斗（濾紙はＪＩＳ２種１枚使用）で濾過・脱水し、酸化チタンの含水ケーキを得る。次に脱イオン水でこの濾過ケーキの中に含まれる夾雑イオンを洗浄する。濾液の比抵抗が８０００〜１００００Ωｃｍになるまで洗浄した後、濾過ケーキ中の水分が４５〜５０％になるように脱水する。ついで、この濾過ケーキ５０ｇをとり、３０ｃｍの高さから鉄板の上へ自由落下させる。ケーキが鉄板上に落ちた後のケーキの状態からそのチキソトロピック性を判断した。結果を表１に示す。
【００２１】
【表１】
表１から明らかなように、本発明の製造方法によって得られた二酸化チタン顔料の含水ケーキは比較例のものに比べチキソトロピック性が極めて低く、工場での濾過・洗浄・成型工程において取り扱い易いものである事がわかる。
【００２３】
試験例２
実施例ならびに比較例の各試料９０ｇを脱イオン水９０ｇに加え、ディスパー（ＴＫラボディスパー、東京機工製）で１０分間分散させ、得られた混合物の粘度をＥ型粘度計（剪断速度１９２s -1）で測定し、流動ペーストになるか調べた。結果を表２に示す。
【００２４】
【表２】
表２より、本発明の製造方法によって得られた二酸化チタン顔料は極めて水分散性に優れており、分散剤を要さずエマルション等の水性塗料に使用することができるものであることがわかる。
【００２６】
【発明の効果】
本発明の二酸化チタン顔料の製造方法は、多孔質シリカ被覆二酸化チタン顔料を生産効率よく製造するために極めて有用であり、また当該製法によって得られた二酸化チタンは、とりわけ水性塗料、特にエマルション塗料系に好適なものである。このものは、分散作業性に優れており、建築用塗料や汎用の工業用塗料などに好適なものであるほか、プラスチック組成物、インキなどに使用できるはなはだ有用なものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a titanium dioxide pigment for an aqueous dispersion.
[0002]
[Prior art]
In the paint field, there is an increasing focus on water-based solvent-based paints, combined with measures for global environment safety, work environment safety, hygiene, and resource saving.
[0003]
By the way, water-based solvent-based paints, especially emulsion paints, are usually dry and have many features such as excellent odor and fire safety and good paint workability. Today, they are used in large quantities in various application fields as industrial and household paints.
[0004]
Emulsion paints are basically made by mixing and dispersing pigments in the synthetic resin emulsion of the vehicle, which is the main component, but the emulsion system is destroyed when subjected to a strong mechanical impact during this dispersion process. In many cases, it is difficult to disperse under strong shear force like solvent-type vehicle paints. For this reason, a high-concentration pigment slurry is usually prepared by suspending and dispersing titanium dioxide pigment and extender pigment in an aqueous medium in the presence of various dispersants and thickeners. Addition to an emulsion to make a paint is performed.
[0005]
[Problems to be solved by the invention]
However, the dispersant is useful for improving the dispersibility, but it is useful for imparting dispersibility of the titanium dioxide pigment, while impairing the physical properties of the coating such as water resistance of the coating. Even in such a case, there are not a few problems that need improvement, such as easy dispersibility of extender pigments. For this reason, there is a strong demand for easily dispersible pigments, in particular titanium dioxide pigments, which are the main constituents, in the absence of a dispersant or in which the addition amount can be minimized.
Conventionally, an attempt has been made to coat silica on the surface of titanium dioxide pigment particles in order to obtain an easily dispersible titanium dioxide pigment. This processing method has a problem in that the handling operation in the filtration and washing steps becomes difficult due to the thixotropic viscosity of the slurry or cake containing the silica-coated titanium dioxide pigment, resulting in a decrease in production efficiency.
[0006]
[Means for Solving the Problems]
As a result of repeated studies to solve the problem of the silica coating treatment on the surface of the titanium dioxide pigment particles, the present inventors have rapidly treated extremely porous silica from the acidic side to the titanium dioxide particle surface. As a result, the inventors have obtained knowledge that the above-mentioned difficulty in handling operations and a reduction in production efficiency can be substantially avoided, and the present invention has been completed.
[0007]
That is, the present invention
1. A method for producing a titanium dioxide pigment, comprising adding a silicate and an acid while maintaining the pH of the aqueous slurry of the titanium dioxide pigment at 1 to 4, and then adding an alkali to coat the porous silica,
2. 1 above. This is a method for producing a titanium dioxide pigment, characterized in that the coating treatment of the porous silica is followed by coating treatment with a polyol compound, an amine compound, or a carboxylic acid compound alone or in combination.
[0008]
The titanium dioxide used in the present invention should be produced by, for example, a so-called sulfuric acid method in which a titanium sulfate solution is hydrolyzed and the resulting hydrous titanium oxide is fired, or a so-called chlorine method in which titanium halide is vapor-phase oxidized. The average particle diameter of the primary particles by the electron micrograph is about 0.1 to 1.0 μm, the crystal form may be either anatase type or rutile type, and anatase type titanium dioxide and A mixture with rutile titanium dioxide may also be used. In addition, in the titanium dioxide of the sulfuric acid method, for example, a metal such as zinc, potassium, aluminum, lithium, niobium, magnesium or a compound such as phosphorus can be added as a baking treatment agent in the production process, and chlorine can also be added. In the case of the method titanium dioxide, a compound such as aluminum or potassium may be added as a treating agent during the oxidation process of titanium tetrachloride in the production process.
[0009]
In the present invention, in order to form a porous silica coating layer on the surface of titanium dioxide particles, an aqueous slurry of titanium dioxide is first prepared. The concentration of the slurry is usually 100 to 600 g / l, preferably 200 to 400 g / l.
[0010]
This slurry is preferably adjusted to a pH of 9 or more with an alkali compound such as sodium hydroxide, potassium hydroxide, ammonia or the like. Further, if necessary, an appropriate dispersant such as phosphate, silicate, polyacrylate or the like can be added to the slurry to improve the dispersion of titanium dioxide. When sodium hexametaphosphate, sodium pyrophosphate, or the like is used as the phosphate, 0.01 to 3% (weight% in terms of P) is preferably added to normal titanium dioxide.
[0011]
Next, an acid such as sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, acetic acid or the like is added to the aqueous slurry of titanium dioxide to adjust the pH of the slurry to 1 to 4, preferably 2 to 3.
[0012]
Next, silicate and acid are added to the aqueous slurry of titanium dioxide while maintaining the pH at 1-4, preferably 2-3, and then neutralized with alkali to form a porous silica coating layer. To do. As the silicate, various silicates such as sodium silicate and potassium silicate and other silicon compounds can be used. Water glass is particularly preferred. The amount of porous silica coated on the surface of titanium dioxide particles is 1 to 10% by weight, preferably 2 to 5% by weight as SiO 2 with respect to the weight of titanium dioxide. A desired effect such as a reduction cannot be obtained, and if it is too much, not only is it not economically advantageous, but the gloss of the coating film tends to be impaired.
[0013]
The silicate is diluted in advance with water or a weak alkaline aqueous solution so as to have a predetermined concentration before the addition, and a predetermined amount is added. The temperature of the titanium dioxide dispersion at the time of neutralization can be set as appropriate, but usually room temperature to 90 ° C. is appropriate.
[0014]
In the present invention, the coating treatment slurry is then filtered, washed, dried, pulverized, and recovered as a surface-coated titanium dioxide pigment. Specifically, the slurry after the neutralization reaction is aged at a temperature of 40 to 90 ° C. for a certain period of time, usually 10 to 60 minutes, and then separated according to a known method, washed, dried, and dry pulverized as necessary. The titanium dioxide pigment product is made through these processes. This dry pulverization after drying is usually carried out with an airflow pulverizer such as a jet mill or a micronizer, a roller mill, a pulverizer, or the like.
[0015]
The titanium dioxide pigment obtained as described above can be surface-treated with various organic substances as required. Various organic substances can be used as the organic substance. For example, there are polyol type, amine type and carboxylic acid type. Specific examples include trimethylol methane, trimethylol ethane, trimethylol propane, pentaerythritol, dimethyl. Examples include ethanolamine, triethanolamine, stearic acid, and oleic acid. These addition amounts are desirably as small as possible within a range that does not impair the performance of the coating film such as water resistance in the aqueous coating system.
[0016]
【Example】
Example 1
After pulverizing and classifying titanium dioxide obtained by oxidizing titanium tetrachloride in the gas phase, an aqueous slurry having a TiO 2 concentration of 300 g / l was added, and an aqueous sodium hydroxide solution was added to adjust the slurry pH to 10.5. And ultrasonic dispersion for 30 minutes. Next, sulfuric acid was added to 4000 ml of the slurry to adjust the pH to 2. Next, while stirring, while maintaining the pH of the aqueous slurry at 2, 320 ml of a water glass (JIS No. 3) aqueous solution (150 g / l in terms of SiO 2 ) was added together with sulfuric acid. Then, 2N aqueous sodium hydroxide solution was added at a rate of about 1 ml / min for 60 minutes to neutralize the pH to 8. Thereafter, the pH was adjusted to 7 with sulfuric acid, and aged for 60 minutes with stirring to obtain a titanium dioxide slurry (slurry A).
Next, the slurry was filtered, washed with water, dried, and pulverized to obtain a titanium dioxide pigment (sample A) having a porous silica coating layer.
[0017]
Comparative Example 1
After pulverizing and classifying titanium dioxide obtained by oxidizing titanium tetrachloride in the gas phase, an aqueous slurry having a TiO2 concentration of 300 g / l was added, and an aqueous sodium hydroxide solution was added to adjust the slurry pH to 10.5. Ultrasonic dispersion was performed for 30 minutes. To 4000 ml of the slurry, 320 ml of a water glass (JIS No. 3) aqueous solution (150 g / l in terms of SiO 2 ) was added with stirring. Subsequently, sulfuric acid was added until pH = 5 to 5.5, and the mixture was aged for 60 minutes with stirring to obtain a titanium dioxide slurry (slurry B) of a comparative example.
Next, this slurry was filtered, washed with water, dried, and pulverized to obtain a titanium dioxide pigment (Sample B) having a coating layer of high-density silica.
[0018]
Comparative Example 2
After pulverizing and classifying titanium dioxide obtained by oxidizing titanium tetrachloride in the gas phase, an aqueous slurry having a TiO2 concentration of 300 g / l was added, and an aqueous sodium hydroxide solution was added to adjust the slurry pH to 10.5. Ultrasonic dispersion was performed for 30 minutes. After adding sulfuric acid to 4000 ml of the slurry to adjust the pH to 6-7, 320 ml of water glass (JIS3) aqueous solution (150 g / l in terms of SiO 2 ) and sulfuric acid were added while maintaining pH = 6-7. The mixture was aged for 60 minutes with stirring to obtain a titanium dioxide slurry (slurry C) as a comparative example.
Next, this slurry was filtered, washed with water, dried, and pulverized to obtain a titanium dioxide pigment (sample C) having a coating layer of low density (porous) silica.
[0019]
Comparative Example 3
After pulverizing and classifying titanium dioxide obtained by oxidizing titanium tetrachloride in the gas phase, an aqueous slurry having a TiO 2 concentration of 300 g / l was added, and an aqueous sodium hydroxide solution was added to adjust the slurry pH to 10.5. And ultrasonic dispersion for 30 minutes. After adding sulfuric acid to 4000 ml of the slurry to adjust the pH to 6-7, 240 ml of sodium aluminate aqueous solution (200 g / l in terms of Al 2 O 3 ) and sulfuric acid were added while maintaining pH = 6-7, The mixture was aged for 60 minutes with stirring to obtain a titanium dioxide slurry (slurry D) as a comparative example.
Next, this slurry was filtered, washed with water, dried, and pulverized to obtain a titanium dioxide pigment (sample D) having an alumina coating layer.
[0020]
Next, the following test was conducted.
Test example 1
Each slurry of Examples and Comparative Examples is filtered and dehydrated with a Buchner funnel (one filter paper is JIS type 2) to obtain a water-containing titanium oxide cake. Next, contaminating ions contained in the filter cake are washed with deionized water. After washing until the specific resistance of the filtrate becomes 8000 to 10000 Ωcm, the filtrate is dehydrated so that the moisture in the filter cake is 45 to 50%. Next, 50 g of this filter cake is taken and freely dropped onto a steel plate from a height of 30 cm. The thixotropic property was judged from the state of the cake after the cake fell on the iron plate. The results are shown in Table 1.
[0021]
[Table 1]
As is apparent from Table 1, the titanium dioxide pigment-containing water cake obtained by the production method of the present invention has extremely low thixotropic properties compared to the comparative example, and is easy to handle in the filtration, washing and molding processes at the factory. I understand that it is.
[0023]
Test example 2
90 g of each sample of Examples and Comparative Examples was added to 90 g of deionized water and dispersed with a disper (TK Lab Disper, manufactured by Tokyo Kiko) for 10 minutes, and the viscosity of the resulting mixture was measured with an E-type viscometer (shear rate 192 s -1 ) And measured whether it became a fluid paste. The results are shown in Table 2.
[0024]
[Table 2]
From Table 2, it can be seen that the titanium dioxide pigment obtained by the production method of the present invention is extremely excellent in water dispersibility and can be used for water-based paints such as emulsions without the need for a dispersant.
[0026]
【The invention's effect】
The method for producing a titanium dioxide pigment of the present invention is extremely useful for producing a porous silica-coated titanium dioxide pigment with high production efficiency, and the titanium dioxide obtained by the production method is particularly suitable for an aqueous paint, particularly an emulsion paint system. It is suitable for. This product is excellent in dispersion workability, and is suitable for architectural paints and general-purpose industrial paints, and is also very useful for plastic compositions, inks and the like.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28737096A JP3696993B2 (en) | 1996-10-09 | 1996-10-09 | Method for producing titanium dioxide pigment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28737096A JP3696993B2 (en) | 1996-10-09 | 1996-10-09 | Method for producing titanium dioxide pigment |
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| Publication Number | Publication Date |
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| JPH10110115A JPH10110115A (en) | 1998-04-28 |
| JP3696993B2 true JP3696993B2 (en) | 2005-09-21 |
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| JP28737096A Expired - Fee Related JP3696993B2 (en) | 1996-10-09 | 1996-10-09 | Method for producing titanium dioxide pigment |
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