JP2008273767A5

JP2008273767A5 -

Info

Publication number: JP2008273767A5
Application number: JP2007117204A
Authority: JP
Filing date: 2007-04-26
Publication date: 2009-09-24
Anticipated expiration: 2027-04-26

Description

本発明は、亜鉛塩、二酸化炭素及び／又は炭酸塩、並びに、グリコール類、グリセリン及びポリグリセリンからなる群より選択される少なくとも一種を混合して、主に炭酸亜鉛及び／又は塩基性炭酸亜鉛からなる析出物を沈殿析出させる工程（１）、及び、上記工程（１）によって得られた析出物を焼成する工程（２）を有することを特徴とする酸化亜鉛の製造方法である。
上記ポリグリセリンは、２〜８量体であることが好ましい。
上記グリコール類、グリセリン及びポリグリセリンからなる群より選択される少なくとも一種の添加量は、亜鉛塩として配合される亜鉛１００質量部に対して３〜６０質量部であることが好ましい。
上記酸化亜鉛の製造方法において、得られる酸化亜鉛は、０．０２５質量％のヘキサメタリン酸ナトリウム水溶液に超音波ホモジナイザーで分散させた際の５０％積算径が０．３μｍ以下であり、かつ同条件で測定した９０％積算径が０．８μｍ以下であることが好ましい。
上記酸化亜鉛の製造方法は、さらに、表面処理を行う工程（３）を有することが好ましい。
上記表面処理を行う工程（３）は、オルガノポリシロキサンによる表面処理を行う工程であることが好ましい。 In the present invention, zinc salt, carbon dioxide and / or carbonate, and at least one selected from the group consisting of glycols, glycerin and polyglycerin are mixed , mainly from zinc carbonate and / or basic zinc carbonate. And a step (1) for precipitating the precipitate to be deposited, and a step (2) for firing the precipitate obtained in the step (1).
The polyglycerin is preferably a 2 to 8 mer.
It is preferable that the addition amount selected from the group consisting of the glycols, glycerin and polyglycerin is 3 to 60 parts by mass with respect to 100 parts by mass of zinc blended as a zinc salt.
In the method for producing zinc oxide, the obtained zinc oxide has a 50% cumulative diameter of 0.3 μm or less when dispersed in an aqueous 0.025 mass% sodium hexametaphosphate solution with an ultrasonic homogenizer, and under the same conditions. The measured 90% integrated diameter is preferably 0.8 μm or less.
The method for producing zinc oxide preferably further includes a step (3) of performing a surface treatment.
The step (3) of performing the surface treatment is preferably a step of performing a surface treatment with an organopolysiloxane.

本発明の酸化亜鉛の製造方法は、比較的穏やかな条件下での解砕によって粉砕させることができる、微細な一次粒子径を有する酸化亜鉛の製造方法である。
上記酸化亜鉛の製造方法は、亜鉛塩、二酸化炭素及び／又は炭酸塩、並びに、グリコール類、グリセリン及びポリグリセリンからなる群より選択される少なくとも一種を混合して、主に炭酸亜鉛及び／又は塩基性炭酸亜鉛からなる析出物を沈殿析出させる工程（１）、及び、上記工程（１）によって得られた析出物を焼成する工程（２）を有することを特徴とするものである。 The method for producing zinc oxide of the present invention is a method for producing zinc oxide having a fine primary particle diameter, which can be pulverized by crushing under relatively mild conditions.
The zinc oxide production method comprises mixing zinc salt, carbon dioxide and / or carbonate, and at least one selected from the group consisting of glycols, glycerin and polyglycerin , and mainly zinc carbonate and / or base. It has the process (1) which precipitates the deposit which consists of a characteristic zinc carbonate , and the process (2) which bakes the deposit obtained by the said process (1), It is characterized by the above-mentioned.

上記工程（１）は、亜鉛源となる化合物と炭酸化合物とを混合することによって、主に炭酸亜鉛及び／又は塩基性炭酸亜鉛からなる析出物を沈殿析出させる工程である。上記工程（１）において炭酸化合物との反応によって亜鉛化合物とすることと、グリコール類、グリセリン及びポリグリセリンからなる群より選択される少なくとも一種を併用して反応を行う点に本発明は特徴を有する。すなわち、このように特定の化合物を使用した特定の反応条件によって酸化亜鉛を製造した場合に、特異的に凝集強度が小さい酸化亜鉛が得られるものである。ここで、上記工程（１）によって得られる析出物とは、主に炭酸亜鉛及び／又は塩基性炭酸亜鉛からなるものであり、反応条件によっては水酸化亜鉛等が含まれる場合もある。 The step (1) is a step of precipitating a precipitate mainly composed of zinc carbonate and / or basic zinc carbonate by mixing a compound serving as a zinc source and a carbonate compound. The present invention is characterized in that in the step (1), the reaction is carried out using a zinc compound by reaction with a carbonic acid compound and at least one selected from the group consisting of glycols, glycerin and polyglycerin. . That is, when zinc oxide is produced under specific reaction conditions using a specific compound as described above, zinc oxide having a specific low cohesive strength can be obtained. Here, the precipitate obtained by the above step (1) is mainly composed of zinc carbonate and / or basic zinc carbonate, and may contain zinc hydroxide or the like depending on the reaction conditions.

Claims

Mixing at least one selected from the group consisting of zinc salts, carbon dioxide and / or carbonates, and glycols, glycerin and polyglycerin, and deposits mainly composed of zinc carbonate and / or basic zinc carbonate A method for producing zinc oxide, comprising a step (1) of precipitating and a step (2) of firing the precipitate obtained in the step (1).

The method for producing zinc oxide according to claim 1, wherein the polyglycerin is a dimer to octamer.

The zinc oxide according to claim 1 or 2, wherein at least one added amount selected from the group consisting of glycols, glycerin and polyglycerin is 3 to 60 parts by mass with respect to 100 parts by mass of zinc blended as a zinc salt. Manufacturing method.

The obtained zinc oxide has a 50% cumulative diameter of 0.3 μm or less when dispersed in a 0.025 mass% sodium hexametaphosphate aqueous solution with an ultrasonic homogenizer, and a 90% cumulative diameter measured under the same conditions is 0. The method for producing zinc oxide according to claim 1, 2 or 3, which is 0.8 µm or less.

Furthermore, the manufacturing method of the zinc oxide of Claim 1, 2, 3 or 4 which has the process (3) which performs surface treatment.

6. The method for producing zinc oxide according to claim 5, wherein the surface treatment step (3) is a step of surface treatment with organopolysiloxane.

A zinc oxide obtained by the method for producing zinc oxide according to claim 1, 2, 3, 4, 5 or 6.

The zinc oxide according to claim 7, which is a colorant.

A cosmetic comprising the zinc oxide according to claim 7.

A coating composition comprising the zinc oxide according to claim 7.

A resin composition comprising the zinc oxide according to claim 7.

50% cumulative diameter when dispersed in 0.025 mass% sodium hexametaphosphate aqueous solution with an ultrasonic homogenizer is 0.3 μm or less, and 90% cumulative diameter measured under the same conditions is 0.8 μm or less. Zinc oxide characterized by

The zinc oxide according to claim 12, which has been surface-treated with an organopolysiloxane.