JP2006263569A - Method for forming black pearl color coating film and black pearl color coating film - Google Patents

Method for forming black pearl color coating film and black pearl color coating film Download PDF

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JP2006263569A
JP2006263569A JP2005085030A JP2005085030A JP2006263569A JP 2006263569 A JP2006263569 A JP 2006263569A JP 2005085030 A JP2005085030 A JP 2005085030A JP 2005085030 A JP2005085030 A JP 2005085030A JP 2006263569 A JP2006263569 A JP 2006263569A
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coating film
pigment
titanium oxide
black
black pearl
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Junya Ogawa
淳也 小川
Minoru Yamamoto
実 山本
Hirohito Mori
宏仁 森
Daisuke Suzuki
大助 鈴木
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Otsuka Chemical Co Ltd
Toyota Motor Corp
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Otsuka Chemical Co Ltd
Toyota Motor Corp
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<P>PROBLEM TO BE SOLVED: To provide a black pearl color coating film with high coal-black property having depth, and a formation method of a black pearl color coating film for forming the black pearl color coating film. <P>SOLUTION: The method for forming the black pearl color coating film has a base coating film formation step in which an intermediate coating film 10 is coated with a base coating containing a scale-like titanium oxide compound pigment or a scale-like titanium oxide compound-covered pigment to form a base coating film 12; a clear coating film formation step for forming a clear coating film 14 containing no light absorbing agent on the base coating film 12; a baking step for baking and curing the base coating film 12 and the clear coating film 14; and a light irradiation step for irradiating the clear coating film 14 with a light capable of reducing the titanium oxide compound to making the titanium oxide compound black. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、黒真珠色塗膜の形成方法および黒真珠色塗膜、特に、より漆黒性の高い、深みのある黒真珠色を表現可能な黒真珠色塗膜の形成方法および黒真珠色塗膜に関する。   The present invention relates to a method for forming a black pearl paint film and a black pearl paint film, in particular, a method for forming a black pearl paint film capable of expressing a deep black pearl color with higher jetness and a black pearl paint. Relates to the membrane.

従来、例えば車両用や家電製品用の黒色塗装は、多数提案されており、その中には、高級感を漂わせる漆黒性の高い黒色塗装も提案されている。   Conventionally, for example, many black coatings for vehicles and home appliances have been proposed, and among them, black coating with high jetness that has a high-class feeling has been proposed.

例えば、図12に示すように、黒中塗塗膜20上にマイカ等の光反射可能な鱗片状顔料を含有するパールベース塗膜26を形成し、このパールベース塗膜26の上にクリア塗膜24を形成することによって黒真珠の意匠を発現する塗膜形成方法も提案されている。   For example, as shown in FIG. 12, a pearl base coating film 26 containing a light-reflective scaly pigment such as mica is formed on a black intermediate coating film 20, and a clear coating film is formed on the pearl base coating film 26. A method of forming a coating film has been proposed in which the design of black pearls is expressed by forming 24.

なお、特許文献1には、普通の白色顔料である二酸化チタンは、樹脂の存在下で紫外線に暴露させると灰色になる傾向があることが記載されている。   Patent Document 1 describes that titanium dioxide, which is an ordinary white pigment, tends to turn gray when exposed to ultraviolet light in the presence of a resin.

特開平9−31359号公報JP 9-31359 A

しかしながら、図12に示すように塗膜を形成したとしても、黒真珠色は発現されるもののより深みのある、いわゆる漆黒性を有する黒真珠色の意匠を得ることはできなかった。   However, even if a coating film was formed as shown in FIG. 12, a black pearl color design having a deep so-called jet black property could not be obtained although a black pearl color was expressed.

本発明は、上記課題に鑑みなされたものであり、より漆黒性の高い、深みのある黒真珠色塗膜およびその黒真珠色塗膜を形成する黒真珠色塗膜の形成方法を提供する。   This invention is made | formed in view of the said subject, and provides the formation method of the black pearl-colored coating film which forms a deep black pearl-colored coating film with higher jetness, and the black pearl-colored coating film.

本発明の黒真珠色塗膜の形成方法は、以下の特徴を有する。   The method for forming a black pearl coating film of the present invention has the following characteristics.

(1)鱗片状の酸化チタン化合物顔料又は鱗片状の酸化チタン化合物被覆顔料を含有するベース塗料を中塗塗膜上あるいは着色ベース塗膜上に塗布してベース塗膜を形成するベース塗膜形成工程と、前記ベース塗膜上に光吸収剤を含まないクリア塗膜を形成するクリア塗膜形成工程と、酸化チタン化合物を還元可能な光を前記クリア塗膜上から照射し前記酸化チタン化合物を黒色化させる光照射工程と、を有する黒真珠色塗膜の形成方法である。   (1) A base coating film forming step of forming a base coating film by applying a base paint containing a scaly titanium oxide compound pigment or a scaly titanium oxide compound-coated pigment on an intermediate coating film or a colored base coating film And a clear coating film forming step for forming a clear coating film containing no light absorber on the base coating film, and the titanium oxide compound is blackened by irradiating light capable of reducing the titanium oxide compound from the clear coating film. A method of forming a black pearl coating film.

上記鱗片状の酸化チタン化合物顔料、鱗片状の酸化チタン化合物被覆顔料は、ベース塗膜中に高配向で緻密に並んだ状態で存在する。一方、光吸収剤を含有しないクリア塗膜上から酸化チタン化合物を還元可能な光を照射することによって、ベース塗膜内に還元可能な光が到達し酸化チタン化合物が黒色化し、ベース塗膜中の顔料が黒色化する。その結果、ベース塗膜において、鱗片状の黒色顔料が緻密に高配向した深みのある漆黒感の高い黒真珠色塗膜が得られる。また、仮にクリア塗膜を透過して空気中の酸素が、クリア塗膜との境界面のベース塗膜に到達し、一旦還元された酸化チタン化合物が酸化され、ベース塗膜中の黒色顔料の一部が白色顔料に変わったとしても、黒色顔料はベース塗膜中に緻密に高配向しているため、酸素がベース塗膜の厚み方向に透過していくことを抑制できる。したがって、ベース塗膜中に還元された状態の黒色顔料が安定して存在するとともに、クリア塗膜との境界面からベース塗膜の厚み方向にしたがって、白色から灰色、黒色に色調が傾向変化してゆき、これにより、深みのある黒真珠色塗膜を形成することができる。   The scaly titanium oxide compound pigment and the scaly titanium oxide compound-coated pigment are present in a highly aligned and densely arranged state in the base coating film. On the other hand, by irradiating light that can reduce the titanium oxide compound from a clear coating film that does not contain a light absorber, the reducible light reaches the base coating film, and the titanium oxide compound is blackened. The pigment turns black. As a result, in the base coating film, a black pearl coating film having a deep jet black feeling in which scaly black pigments are densely and highly oriented is obtained. Also, if oxygen in the air passes through the clear coating and reaches the base coating at the interface with the clear coating, the once reduced titanium oxide compound is oxidized, and the black pigment in the base coating Even if a part of the pigment is changed to a white pigment, the black pigment is densely and highly oriented in the base coating film, so that oxygen can be prevented from being transmitted in the thickness direction of the base coating film. Therefore, the reduced black pigment is stably present in the base coating, and the color tone changes from white to gray and black according to the thickness direction of the base coating from the boundary with the clear coating. As a result, a deep black pearl coating film can be formed.

(2)上記(1)に記載の黒真珠色塗膜の形成方法において、前記クリア塗膜形成工程と光照射工程との間に、少なくとも前記中塗塗膜とベース塗膜とクリア塗膜とを焼き付ける焼付工程を有する。   (2) In the method for forming a black pearl coating film according to (1) above, at least the intermediate coating film, the base coating film, and the clear coating film are provided between the clear coating film forming step and the light irradiation step. It has a baking process of baking.

光照射前に焼付けを行うことによって、ベース塗膜中に存在する光照射で変性される可能性のある溶剤を塗膜中から除去することができ、さらにベース塗膜も硬化するので、ベース塗膜中の鱗片状の酸化チタン化合物顔料、鱗片状の酸化チタン化合物被覆顔料がより緻密に高配向して固定される。その後、光吸収剤を含有しないクリア塗膜を形成し、このクリア塗膜上から酸化チタン化合物を還元可能な光を照射することによって、下層のベース塗膜にまでに還元可能な光が透過し、緻密に高配向した鱗片状の酸化チタン化合物顔料、鱗片状の酸化チタン化合物被覆顔料は黒色化する。さらに光照射前に焼付けを行うことにより、ベース塗膜中の黒色化した黒色顔料はより緻密に高配向しているため、仮にクリア塗膜を介して酸素がベース塗膜に到達したとしても、ベース塗膜の厚み方向に酸素が浸透していくことを阻止し、ベース塗膜中の黒色顔料のほとんどが酸化されずに黒色顔料として安定して存在するとともに、クリア塗膜との境界面からベース塗膜の厚み方向にしたがって、白色から灰色、黒色に色調が傾向変化してゆき、その結果、漆黒性の高い黒真珠色塗膜を形成することができる。   By baking before light irradiation, the solvent that may be modified by light irradiation existing in the base coating can be removed from the coating, and the base coating is also cured. The scaly titanium oxide compound pigment and the scaly titanium oxide compound-coated pigment in the film are fixed in a more precise and highly oriented manner. After that, a clear coating film that does not contain a light absorber is formed, and light that can reduce the titanium oxide compound from this clear coating film is irradiated, so that the reducible light is transmitted to the lower base coating film. The scaly titanium oxide compound pigment and the scaly titanium oxide compound-coated pigment that are densely and highly oriented turn black. Furthermore, by baking before light irradiation, the blackened black pigment in the base coating is more dense and highly oriented, so even if oxygen reaches the base coating through the clear coating, It prevents oxygen from penetrating in the thickness direction of the base coating film, and most of the black pigment in the base coating film is stably oxidized as a black pigment without being oxidized, and from the boundary with the clear coating film. According to the thickness direction of the base coating film, the color tone tends to change from white to gray and black, and as a result, a black pearl coating film with high jetness can be formed.

(3)上記(1)または(2)に記載の黒真珠色塗膜の形成方法において、前記中塗塗膜は、酸化チタン化合物顔料を含む白中塗塗膜あるいは着色ベース塗膜である。   (3) In the method for forming a black pearl coating film according to (1) or (2) above, the intermediate coating film is a white intermediate coating film or a colored base coating film containing a titanium oxide compound pigment.

酸化チタン化合物を還元可能な光はベース塗膜を透過し、中塗塗膜あるいは着色ベース塗膜に到達し、中塗塗膜中あるいは着色ベース塗膜中の顔料も黒色化する。これによって、より漆黒性の高い黒真珠色塗膜を得ることができる。   Light capable of reducing the titanium oxide compound passes through the base coating film and reaches the intermediate coating film or the colored base coating film, and the pigment in the intermediate coating film or the colored base coating film also becomes black. Thereby, a black pearl color coating film with higher jetness can be obtained.

(4)上記(1)から(3)のいずれか1つに記載の黒真珠色塗膜の形成方法において、前記鱗片状の酸化チタン化合物顔料は、鱗片状の酸化チタン顔料また鱗片状のチタン酸顔料である。   (4) In the method for forming a black pearl coating film according to any one of (1) to (3), the scaly titanium oxide compound pigment is a scaly titanium oxide pigment or scaly titanium. It is an acid pigment.

特に、層状チタン酸塩を酸で処理して層状チタン酸とし、次いで有機塩基性化合物を作用させて層間を剥離した薄片状チタン酸チタン酸は、極薄の鱗片状のチタン酸顔料であるため、ベース塗膜中により緻密に高配向して存在し、さらに、極薄の鱗片状のチタン酸顔料に光を照射して還元させ黒色化させることによって、ベース塗膜中に黒色顔料をより緻密で高配向させることができ、深みのある黒真珠色塗膜を得ることができるとともに、緻密で高配向であるため、ベース塗膜の厚み方向への酸素透過を大幅に抑制することができ、その結果、安定したより深みのある黒真珠色塗膜を得ることができる。   In particular, flaky titanic acid titanate obtained by treating layered titanate with acid to form layered titanic acid and then separating the layers by the action of an organic basic compound is an extremely thin scaly titanate pigment. In the base coating film, the black pigment is more densely oriented in the base coating film by irradiating the ultrathin scaly titanate pigment with light and reducing it to blacken. In addition to being able to obtain a deep black pearl coating film, and being dense and highly oriented, oxygen transmission in the thickness direction of the base coating film can be greatly suppressed, As a result, a stable and deep black pearl coating can be obtained.

(5)上記(1)から(3)のいずれか1つに記載の頃真珠色塗膜の形成方法において、前記鱗片状の酸化チタン化合物被覆顔料は、鱗片状アルミナ表面を酸化チタンにより被覆した顔料またはマイカ表面を酸化チタンにより被覆した顔料である。   (5) In the method for forming a pearl-colored coating film according to any one of (1) to (3) above, the scaly titanium oxide compound-coated pigment has a scaly alumina surface coated with titanium oxide. The pigment or the mica surface is coated with titanium oxide.

上記顔料も、ベース塗膜中に高配向に並べることにより、酸素がベース塗膜の厚み方向に透過して行くことを抑制できるため、上述同様、光照射後に黒色化した黒色顔料によって、深みのある黒真珠色塗膜を得ることができる。   By arranging the pigment in the base coating in a highly oriented manner, oxygen can be prevented from permeating in the thickness direction of the base coating. A certain black pearl color coating can be obtained.

(6)請求項1から請求項5のいずれか1項に記載の黒真珠色塗膜の形成方法において、前記酸化チタン化合物を還元可能な光は、紫外線であり、前記光吸収剤は、紫外線吸収剤である。   (6) In the method for forming a black pearl coating film according to any one of claims 1 to 5, light capable of reducing the titanium oxide compound is ultraviolet light, and the light absorber is ultraviolet light. It is an absorbent.

紫外線は、上記酸化チタン化合物のバンドギャップに合うエネルギー波長を有するため、酸化チタン化合物を還元することができ、その結果、酸化チタン化合物を黒色化することができる。また、クリア塗膜中に紫外線吸収剤を含有させないことによって、クリア塗膜上から紫外線を照射した場合、紫外線がクリア塗膜を透過してベース塗膜に到達し、ベース塗膜中の顔料を黒色化させることができる。   Since ultraviolet rays have an energy wavelength that matches the band gap of the titanium oxide compound, the titanium oxide compound can be reduced, and as a result, the titanium oxide compound can be blackened. Also, by not containing an ultraviolet absorber in the clear coating, when the clear coating is irradiated with ultraviolet rays, the ultraviolet rays penetrate the clear coating to reach the base coating, and the pigment in the base coating It can be blackened.

本発明の黒真珠色塗膜は、以下の特徴を有する。   The black pearl coating film of the present invention has the following characteristics.

上記(1)から(6)のいずれか1つに記載の黒真珠色塗膜の形成方法により形成された黒真珠色塗膜である。   A black pearl color coating film formed by the method for forming a black pearl color coating film according to any one of (1) to (6) above.

また、照射光により還元され黒色化した黒色鱗片状顔料が高配向で且つ緻密に並んだ状態で存在する塗膜を少なくとも1層含む黒真珠色塗膜である。   Moreover, it is a black pearl-colored coating film containing at least one coating film in which black scale pigments reduced and blackened by irradiation light are present in a highly aligned and densely arranged state.

黒色化した黒色鱗片状顔料が緻密に高配向し、さらに、クリア塗膜との境界面からベース塗膜の厚み方向にしたがって、白色から灰色、黒色に色調が傾向変化してゆくため、深みのある漆黒性の高い黒真珠色の塗膜となる。   The blackened black scaly pigment is densely and highly oriented, and further, the color tone tends to change from white to gray and black according to the thickness direction of the base coating from the boundary with the clear coating. It becomes a black pearl-colored coating film with high jetness.

本発明によれば、顔料の緻密な高配向により真珠意匠が得られるとともに、光照射による黒色化顔料の黒色発現により、漆黒性の高い黒真珠色の意匠が発現される。さらに、ベース塗膜において、クリア塗膜境界面から徐々に白色、灰色、黒色に色調が傾向変化するため、深み感のある黒真珠色塗膜を得ることができる。   According to the present invention, a pearl design can be obtained by dense and high orientation of the pigment, and a black pearl design with high jetness can be achieved by developing the black color of the blackened pigment by light irradiation. Furthermore, in the base coating film, the color tone gradually changes from white to gray and black from the boundary surface of the clear coating film, so that a deep black pearl coating film can be obtained.

以下、本発明の実施形態について、図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[黒真珠色塗膜の形成方法]
本発明の好適な実施の形態の黒真珠色塗膜の形成方法は、図1,図2,図3に示すように、鱗片状の酸化チタン化合物顔料または鱗片状の酸化チタン化合物被覆顔料を含有するベース塗料を図1に示す中塗塗膜10上あるいは図2に示す着色ベース塗膜11上に塗布してベース塗膜12を形成するベース塗膜形成工程と、ベース塗膜12上に光吸収剤を含まないクリア塗膜14を形成するクリア塗膜形成工程と、酸化チタン化合物を還元可能な光をクリア塗膜14上から照射し前記酸化チタン化合物を黒色化させる光照射工程と、を有する。
[Formation method of black pearl coating]
The method for forming a black pearl coating film according to a preferred embodiment of the present invention contains a scaly titanium oxide compound pigment or a scaly titanium oxide compound-coated pigment as shown in FIGS. A base coating film forming step for forming the base coating film 12 by applying the base coating material on the intermediate coating film 10 shown in FIG. 1 or the colored base coating film 11 shown in FIG. 2 and light absorption on the base coating film 12 A clear coating film forming step for forming the clear coating film 14 containing no agent, and a light irradiation step for irradiating light capable of reducing the titanium oxide compound from the clear coating film 14 to blacken the titanium oxide compound. .

上記鱗片状の酸化チタン化合物顔料、鱗片状の酸化チタン化合物被覆顔料は、ベース塗膜12中に高配向で緻密に並んだ状態で存在する。一方、光吸収剤を含有しないクリア塗膜14上から酸化チタン化合物を還元可能な光を照射することによって、ベース塗膜12内に還元可能な光が到達し酸化チタン化合物が黒色化し、ベース塗膜12中の顔料が黒色化する。このため、黒色化ベース塗膜16では、鱗片状の黒色顔料が緻密に高配向した状態になる。その結果、深みのある漆黒感の高い黒真珠色塗膜が得られる。また、仮にクリア塗膜14を透過して空気中の酸素(O2)が、クリア塗膜14との境界面の黒色化ベース塗膜16に到達し、一旦還元された酸化チタン化合物が酸化され、ベース塗膜12中の黒色顔料の一部が白色顔料に変わったとしても、黒色顔料は黒色化ベース塗膜16中に緻密に高配向しているため、黒色顔料のガスパリア性によって、酸素が黒色化ベース塗膜16の厚み方向に透過していくことは抑制される。したがって、黒色化ベース塗膜16中に還元された状態の黒色顔料が安定して存在するとともに、クリア塗膜との境界面からベース塗膜の厚み方向にしたがって、白色から灰色、黒色に色調が傾向変化してゆき、これにより、深みのある黒真珠色塗膜を形成することができる。 The scaly titanium oxide compound pigment and the scaly titanium oxide compound-coated pigment are present in the base coating film 12 in a highly aligned and densely arranged state. On the other hand, by irradiating light that can reduce the titanium oxide compound from the clear coating film 14 that does not contain the light absorber, the reducible light reaches the base coating film 12 and the titanium oxide compound is blackened. The pigment in the film 12 is blackened. For this reason, in the blackened base coating film 16, the scaly black pigment is densely and highly oriented. As a result, a deep black pearl coating with a deep jetness is obtained. Further, if oxygen (O 2 ) in the air passes through the clear coating film 14 and reaches the blackened base coating film 16 on the boundary surface with the clear coating film 14, the once reduced titanium oxide compound is oxidized. Even if a part of the black pigment in the base coating film 12 is changed to a white pigment, the black pigment is densely and highly oriented in the blackened base coating film 16, so that the oxygen is absorbed by the gas parrality of the black pigment. Transmission of the blackened base coating film 16 in the thickness direction is suppressed. Therefore, the black pigment in a reduced state is stably present in the blackened base coating film 16, and the color tone changes from white to gray and black according to the thickness direction of the base coating film from the boundary surface with the clear coating film. The tendency is changed, whereby a deep black pearl coating film can be formed.

また、好ましくは、クリア塗膜形成工程と光照射工程との間に、少なくとも中塗塗膜10とベース塗膜12とクリア塗膜14とを焼き付ける焼付工程を有する。   Preferably, a baking step of baking at least the intermediate coating film 10, the base coating film 12, and the clear coating film 14 is provided between the clear coating film forming process and the light irradiation process.

光照射前に焼き付けを行うことによって、ベース塗膜12中に存在する光照射で変性される可能性のある溶剤を塗膜中から除去することができ、さらにベース塗膜12も硬化するので、ベース塗膜12中の鱗片状の酸化チタン化合物顔料、鱗片状の酸化チタン化合物被覆顔料がより緻密に高配向して固定される。その後、光吸収剤を含有しないクリア塗膜14を形成し、このクリア塗膜14上から酸化チタン化合物を還元可能な光を照射することによって、下層のベース塗膜12にまでに還元可能な光が透過し、緻密に高配向した鱗片状の酸化チタン化合物顔料、鱗片状の酸化チタン化合物被覆顔料は黒色化する。さらに光照射前に焼付けを行うことにより、黒色化ベース塗膜16中の黒色顔料はより緻密に高配向しているため、仮にクリア塗膜14を介して酸素が黒色化ベース塗膜16に到達したとしても、黒色顔料は黒色化ベース塗膜16の厚み方向に酸素が浸透していくことを阻止し、黒色化ベース塗膜16中の黒色顔料のほとんどが酸化されずに黒色顔料として安定して存在する。また、クリア塗膜14との境界面から黒色化ベース塗膜16の厚み方向にしたがって、白色から灰色、黒色に色調が傾向変化してゆくので、深みのあるより漆黒性の高い黒真珠色塗膜を形成することができる。   By baking before light irradiation, the solvent that may be modified by light irradiation existing in the base coating film 12 can be removed from the coating film, and the base coating film 12 is also cured. The scaly titanium oxide compound pigment and the scaly titanium oxide compound-coated pigment in the base coating film 12 are more precisely oriented and fixed. Thereafter, a clear coating film 14 that does not contain a light absorber is formed, and light that can be reduced to the lower base coating film 12 by irradiating light that can reduce the titanium oxide compound from the clear coating film 14. The scaly titanium oxide compound pigment and the scaly titanium oxide compound-coated pigment that are densely and highly oriented are blackened. Further, by baking before light irradiation, the black pigment in the blackened base coating film 16 is more densely and highly oriented, so that oxygen reaches the blackened base coating film 16 via the clear coating film 14. Even so, the black pigment prevents oxygen from penetrating in the thickness direction of the blackened base coating film 16, and most of the black pigment in the blackened base coating film 16 is stabilized without being oxidized as a black pigment. Exist. In addition, since the color tone tends to change from white to gray and black according to the thickness direction of the blackened base coating film 16 from the boundary surface with the clear coating film 14, a black pearl coating with a deep jetness and a deep depth A film can be formed.

本実施の形態では、ベース塗膜12上にクリア塗膜を形成したのち、焼き付けを行うことが望ましく、すなわち、中塗塗膜10あるいは着色ベース塗膜11、ベース塗膜12、クリア塗膜14において、3コート2ベークが好ましい。ベース塗料が水性塗料の場合には、中塗塗装を行ったのち中塗塗膜10を焼き付け、次いでベース塗装を行った後ベース塗膜12をプレヒートし、さらにクリア塗装によりクリア塗膜14を形成し焼き付ける、3コート1プレヒート2ベークが望ましい。   In the present embodiment, it is desirable to perform baking after forming a clear coating film on the base coating film 12, that is, in the intermediate coating film 10 or the colored base coating film 11, the base coating film 12, and the clear coating film 14. 3-coat 2-bake is preferred. When the base paint is a water-based paint, after the intermediate coating is performed, the intermediate coating film 10 is baked, then after the base coating is performed, the base coating film 12 is preheated, and further, the clear coating film 14 is formed by the clear coating and baked. 3 coats 1 preheat 2 bake is desirable.

また、上記中塗塗膜10は、酸化チタン化合物顔料を含む白中塗塗膜であることがより好ましい。   The intermediate coating film 10 is more preferably a white intermediate coating film containing a titanium oxide compound pigment.

酸化チタン化合物を還元可能な光は、ベース塗膜12を透過し、さらに図1に示す中塗塗膜10あるいは図2に示す着色ベース塗膜11に到達し、中塗塗膜10中あるいは着色ベース塗膜11中の酸化チタン化合物顔料も還元し黒色化する。一方、黒色化ベース塗膜16中に黒色顔料が高配向で緻密に並んでいるのでガスバリア性が発現され、酸素は中塗塗膜10まで到達せず、その結果、図4に例示するように、中塗塗膜10の黒色化ベース塗膜16境界付近より深いところに存在する黒色化顔料は黒色のまま保持されるため、黒色化中塗り塗膜18となり、より漆黒性の高い黒真珠色塗膜を得ることができる。図2の構成についても同様に、着色ベース塗膜11の黒色化ベース塗膜16境界付近より深いところに存在する黒色化顔料は黒色のまま保持されるため、黒色化着色ベース塗膜となり、より漆黒性の高い黒真珠色塗膜を得ることができる。   The light capable of reducing the titanium oxide compound passes through the base coating film 12, and further reaches the intermediate coating film 10 shown in FIG. 1 or the colored base coating film 11 shown in FIG. The titanium oxide compound pigment in the film 11 is also reduced and blackened. On the other hand, since the black pigments are densely arranged in a highly oriented manner in the blackened base coating film 16, gas barrier properties are expressed, oxygen does not reach the intermediate coating film 10, and as a result, as illustrated in FIG. Since the blackening pigment existing deeper than the vicinity of the boundary of the blackening base coating film 16 of the intermediate coating film 10 is kept black, it becomes a blackened intermediate coating film 18 and a black pearl coating film with higher jetness. Can be obtained. Similarly, in the configuration of FIG. 2, since the blackened pigment existing deeper than the vicinity of the boundary of the blackened base coating film 16 of the colored base coating film 11 is maintained as black, it becomes a blackened colored base coating film. A black nacreous paint film with high jetness can be obtained.

上記酸化チタン化合物としては、Ti23,TiO2を含む酸化チタン、層状チタン酸塩を酸で処理して層状チタン酸とし、次いで有機塩基性化合物を作用させて層間を剥離した薄片状チタン酸からなる群から選択される化合物が好ましい。 As the above-mentioned titanium oxide compound, titanium oxide containing Ti 2 O 3 and TiO 2 , lamellar titanate obtained by treating layered titanate with acid to form layered titanic acid, and then causing the organic basic compound to act to separate the layers Compounds selected from the group consisting of acids are preferred.

そして、上記鱗片状の酸化チタン化合物顔料は、Ti23,TiO2を含む鱗片状の酸化チタン顔料、または、層状チタン酸塩を酸で処理して層状チタン酸とし、次いで有機塩基性化合物を作用させて層間を剥離した薄片状チタン酸からなるチタン酸顔料から選択される顔料である。 The scaly titanium oxide compound pigment is a scaly titanium oxide pigment containing Ti 2 O 3 or TiO 2 or a layered titanate treated with an acid to form a layered titanic acid, and then an organic basic compound Is a pigment selected from titanic acid pigments made of flaky titanic acid separated from each other by acting.

特に、層状チタン酸塩を酸で処理して層状チタン酸とし、次いで有機塩基性化合物を作用させて層間を剥離した薄片状チタン酸は、極薄の鱗片状のチタン酸顔料であるため、ベース塗膜中により緻密に高配向して存在し、さらに、極薄の鱗片状のチタン酸顔料に光を照射して還元させ黒色化させることによって、ベース塗膜中に黒色顔料をより緻密で高配向させることができ、深みのある黒真珠色塗膜を得ることができるとともに、緻密で高配向であるため、ベース塗膜の厚み方向への酸素透過を大幅に抑制することができ、その結果、安定したより深みのある黒真珠色塗膜を得ることができる。   In particular, flaky titanic acid obtained by treating a layered titanate with an acid to form layered titanic acid and then separating the layers by the action of an organic basic compound is an extremely thin scaly titanate pigment. It is present in a more highly oriented film in the paint film, and further, the ultrathin scaly titanate pigment is irradiated with light to reduce it to black, thereby making the black paint more dense and high in the base paint film. As a result, it is possible to obtain a deep black pearl paint film that can be oriented, and because it is dense and highly oriented, oxygen transmission in the thickness direction of the base paint film can be greatly suppressed. A stable and deep black pearl coating film can be obtained.

また、上記酸化チタン化合物被覆顔料は、鱗片状アルミナ表面を酸化チタンにより被覆した顔料またはマイカ表面を酸化チタンにより被覆した顔料から選択される。   The titanium oxide compound-coated pigment is selected from a pigment having a scaly alumina surface coated with titanium oxide or a pigment having a mica surface coated with titanium oxide.

上記顔料も、ベース塗膜中に高配向に並べることにより、酸素がベース塗膜の厚み方向に透過して行くことを抑制できるため、上述同様、光照射後に黒色化した黒色顔料によって、深みのある黒真珠色塗膜を得ることができる。   By arranging the pigment in the base coating in a highly oriented manner, oxygen can be prevented from permeating in the thickness direction of the base coating. A certain black pearl color coating can be obtained.

さらに、上記酸化チタン化合物を還元可能な光は、紫外線である。紫外線は、上記酸化チタン化合物のバンドギャップに合うエネルギー波長を有する。したがって、上記酸化チタン化合物を還元することができる。例えば、酸化チタンの場合には、紫外線照射により次のような還元反応が生じる。   Furthermore, the light that can reduce the titanium oxide compound is ultraviolet light. Ultraviolet rays have an energy wavelength that matches the band gap of the titanium oxide compound. Therefore, the titanium oxide compound can be reduced. For example, in the case of titanium oxide, the following reduction reaction occurs upon irradiation with ultraviolet rays.

(化1)
TiO2 →TiO2-x
Ti23 →Ti2-y3-x
(Chemical formula 1)
TiO 2 → TiO 2-x
Ti 2 O 3 → Ti 2-y O 3-x

上記還元反応により、酸化チタン化合物を黒色化する。ここで、紫外線は、200〜380nmの波長を有するものであり、還元度合いおよび黒色度合いに応じて、自然界に存在するUV−A(320〜380nm)、UV−B(280〜320nm)を用い、照射量を調整することが望ましい。黒色度合いは、クリア塗膜まで形成された積層塗膜において、L***表色系のL*値が72以下にすることが好ましく、より好ましくはL*値が71以下である。L*値を72以下にすることによって、漆黒感の高い黒真珠色感を得ることができる。紫外線の照度は200〜250W・s/m2が好ましく、その照射時間は30〜300分が好ましく、より好ましくは60〜250分である。 The titanium oxide compound is blackened by the reduction reaction. Here, the ultraviolet ray has a wavelength of 200 to 380 nm, and UV-A (320 to 380 nm) and UV-B (280 to 320 nm) existing in nature are used depending on the degree of reduction and the degree of blackness. It is desirable to adjust the dose. Regarding the degree of blackness, in the laminated coating film formed up to the clear coating film, the L * value of the L * a * b * color system is preferably 72 or less, and more preferably the L * value is 71 or less. By setting the L * value to 72 or less, it is possible to obtain a black pearl color feeling with a high jetness. The illuminance of ultraviolet rays is preferably 200 to 250 W · s / m 2 , and the irradiation time is preferably 30 to 300 minutes, more preferably 60 to 250 minutes.

また、光として上記紫外線を照射する場合、上記クリア塗膜には、光吸収剤である紫外線吸収剤は含ませない。クリア塗膜中に紫外線吸収剤を含有させないことによって、クリア塗膜上から紫外線を照射した場合、紫外線がクリア塗膜を透過してベース塗膜に到達し、ベース塗膜中の顔料を黒色化させることができる。   Moreover, when irradiating the said ultraviolet-ray as light, the said ultraviolet-ray absorber which is a light absorber is not included in the said clear coating film. By not containing an ultraviolet absorber in the clear coating, when the UV is irradiated from above the clear coating, the UV penetrates the clear coating and reaches the base coating, and the pigment in the base coating is blackened. Can be made.

また、ベース塗膜12を形成するベース塗料としては、溶剤系ベース塗料と水性ベース塗料とがある。そして、水性ベース塗料、特に熱硬化型水性塗料は、鱗片状のチタン酸顔料と、水に溶解又は分散可能な樹脂と、必要に応じて架橋剤と、溶媒である水とを含有する。水に溶解又は分散可能な樹脂としては、例えば、1分子中にカルボキシル基等の親水基と水酸基等の架橋性官能基とを含有する樹脂であって、具体的に、アクリル樹脂、ポリエステル樹脂、ポリウレタン樹脂などが挙げられる。架橋剤としては、例えば、疎水性又は親水性のアルキルエーテルメラミン樹脂、ブロックイソシアネート化合物等を挙げることができる。一方、溶剤系ベース塗料は、鱗片状のチタン酸顔料と、上記同様の樹脂と、必要に応じて架橋剤と、溶剤とを含有する。   The base paint for forming the base coating film 12 includes a solvent-based base paint and an aqueous base paint. An aqueous base paint, particularly a thermosetting aqueous paint, contains a scaly titanate pigment, a resin that can be dissolved or dispersed in water, a cross-linking agent as necessary, and water as a solvent. As a resin that can be dissolved or dispersed in water, for example, a resin containing a hydrophilic group such as a carboxyl group and a crosslinkable functional group such as a hydroxyl group in one molecule, specifically, an acrylic resin, a polyester resin, A polyurethane resin etc. are mentioned. Examples of the crosslinking agent include hydrophobic or hydrophilic alkyl ether melamine resins and blocked isocyanate compounds. On the other hand, the solvent-based base paint contains a scaly titanate pigment, a resin similar to the above, and a cross-linking agent and a solvent as necessary.

また、ベース塗膜12は、水性ベース塗料を用いた場合には膜厚10〜15μmで塗装され、溶剤系ベース塗料を用いた場合には、膜厚12〜18μmで塗装される。   The base coating film 12 is applied with a film thickness of 10 to 15 μm when a water-based base paint is used, and is applied with a film thickness of 12 to 18 μm when a solvent-based base paint is used.

クリア塗膜14を形成するクリア塗料は、本実施の形態では無色透明の塗膜を形成可能な熱硬化性塗料が好ましく、熱硬化性樹脂と有機溶剤と、必要に応じて、紫外線吸収剤等が含有されている。上記熱硬化性樹脂としては、例えば、水酸基、カルボキシル基、シラノール基、エポキシ基などの架橋性官能基を有するアクリル樹脂、ポリエステル樹脂、アルキド樹脂、フッ素樹脂、ウレタン樹脂、シリコン含有樹脂などの樹脂と、これらの架橋性官能基に反応しうるメラミン樹脂、尿素樹脂、(ブロック)ポリイソシアネート化合物、エポキシ樹脂化合物又は樹脂、カルボキシル基含有化合物又は樹脂、酸無水物、アルコキシシラン基含有化合物又は樹脂などの架橋剤とからなる。   In the present embodiment, the clear paint forming the clear paint film 14 is preferably a thermosetting paint capable of forming a colorless and transparent paint film, such as a thermosetting resin, an organic solvent, and an ultraviolet absorber if necessary. Is contained. Examples of the thermosetting resin include resins such as an acrylic resin, a polyester resin, an alkyd resin, a fluororesin, a urethane resin, and a silicon-containing resin having a crosslinkable functional group such as a hydroxyl group, a carboxyl group, a silanol group, and an epoxy group. Melamine resin, urea resin, (block) polyisocyanate compound, epoxy resin compound or resin, carboxyl group-containing compound or resin, acid anhydride, alkoxysilane group-containing compound or resin, etc. that can react with these crosslinkable functional groups It consists of a crosslinking agent.

また、クリア塗膜14は、30〜50μmの膜厚で塗装される。   Moreover, the clear coating film 14 is painted by the film thickness of 30-50 micrometers.

上述したチタン酸顔料としては、層状チタン酸塩を酸で処理して層状チタン酸とし、次いで有機塩基性化合物を作用させて層間を剥離した薄片状チタン酸を得ることができる。   As the titanic acid pigment described above, lamellar titanic acid obtained by treating a layered titanate with an acid to form layered titanic acid and then allowing an organic basic compound to act thereon can be obtained.

以下に、極薄鱗片状チタン酸顔料の製造方法の一例を図5を用いて説明する。   Below, an example of the manufacturing method of an ultra-thin scaly titanate pigment is demonstrated using FIG.

層状チタン酸塩K0.8Li0.27Ti1.734を酸処理し、交換可能な金属カチオンを水素イオンまたはヒドロニウムイオンで置換することにより層状チタン酸(例えば、H1.07Ti1.734・nH2O)が得られる。この層状チタン酸に有機塩基性化合物を作用させ、層間を剥離することにより、薄片状チタン酸の水性媒体分散液(剥離ゾル)が得られる。有機塩基性化合物としては、ジメチルエタノールアミン(DMEA)が望ましい。 The layered titanate K 0.8 Li 0.27 Ti 1.73 O 4 is treated with acid, and the exchangeable metal cation is replaced with hydrogen ion or hydronium ion to form layered titanate (for example, H 1.07 Ti 1.73 O 4 .nH 2 O ) Is obtained. An organic basic compound is allowed to act on the layered titanic acid and the layers are separated to obtain an aqueous medium dispersion (peeling sol) of flaky titanic acid. As the organic basic compound, dimethylethanolamine (DMEA) is desirable.

好ましくは、次いで、上記剥離ゾルに炭酸セシウムを添加して有機塩基性化合物をセシウムイオンで置換し、遠心洗浄で過剰炭酸セシウムおよび生成アミン炭酸塩を除去し、さらに炭酸ガスのバブリングにより、チタン酸の中和ゾルを形成する。得られた薄片状チタン酸の水性媒体分散液(剥離ゾル)は、耐光性が向上する。   Preferably, cesium carbonate is then added to the stripping sol to replace the organic basic compound with cesium ions, excess cesium carbonate and generated amine carbonate are removed by centrifugal washing, and further, titanic acid is obtained by bubbling carbon dioxide gas. To form a neutralized sol. The resulting flaky titanic acid aqueous medium dispersion (release sol) has improved light resistance.

得られた水性媒体分散液(剥離ゾル)の薄片状チタン酸は、図6に示すように、1枚約1nmのチタン酸が積層し、2〜50層チタン酸が積層された鱗片状チタン酸として得られる。この鱗片状チタン酸は、その厚みが最大でも50nm以下、好ましくは10〜50nmであり、鱗片状の長手方向の長さ(粒径)が15〜20μmである。この鱗片状のチタン酸の顔料は、上述した塗膜形成方法を用いることにより、ベース塗膜中で、図9に示すベース塗膜断面の走査電子顕微鏡写真のように、高配向で緻密に並ぶ。   The flaky titanic acid of the obtained aqueous medium dispersion (peeling sol) is a flaky titanic acid obtained by laminating about 1 nm of titanic acid and laminating 2-50 layers of titanic acid as shown in FIG. As obtained. The scaly titanic acid has a thickness of 50 nm or less, preferably 10 to 50 nm at the maximum, and has a scaly longitudinal length (particle size) of 15 to 20 μm. These scaly titanic acid pigments are arranged in a highly oriented and dense manner in the base coating film as shown in the scanning electron micrograph of the cross section of the base coating film shown in FIG. 9 by using the coating film forming method described above. .

<薄片状チタン酸分散液の合成>
(合成例1)
酸化チタン67.01g、炭酸カリウム26.78g、塩化カリウム12.04gおよび水酸化リチウム5.08gを乾式で粉砕混合した原料を1020℃にて4時間焼成した。得られた粉末の10.9%水スラリー7.9kgを調製し、10%硫酸水溶液470gを加えて2時間撹拌し、スラリーのpHを7.0に調製した。分離、水洗したものを110℃で乾燥した後、600℃で12時間焼成した。得られた白色粉末は層状チタン酸塩K0.6Li0.27Ti1.733.9であり、平均長径15μmであった。
<Synthesis of flaky titanic acid dispersion>
(Synthesis Example 1)
A raw material in which 67.01 g of titanium oxide, 26.78 g of potassium carbonate, 12.04 g of potassium chloride and 5.08 g of lithium hydroxide were pulverized and mixed in a dry process was calcined at 1020 ° C. for 4 hours. 7.9 kg of 10.9% aqueous slurry of the obtained powder was prepared, 470 g of 10% aqueous sulfuric acid solution was added and stirred for 2 hours, and the pH of the slurry was adjusted to 7.0. What was separated and washed with water was dried at 110 ° C. and then calcined at 600 ° C. for 12 hours. The obtained white powder was layered titanate K 0.6 Li 0.27 Ti 1.73 O 3.9 and had an average major axis of 15 μm.

この層状チタン酸塩65gを3.5%塩酸5kgに分散撹拌し、40℃で2時間反応させた後、吸引濾過で分離し、水洗した。得られた層状チタン酸のK2O残量は2.0%であり、金属イオン交換率は94%であった。 65 g of this layered titanate was dispersed and stirred in 5 kg of 3.5% hydrochloric acid, reacted at 40 ° C. for 2 hours, separated by suction filtration, and washed with water. The obtained layered titanic acid had a K 2 O remaining amount of 2.0% and a metal ion exchange rate of 94%.

得られた層状チタン酸全量を脱イオン水1.6kgに分散して撹拌しながら、ジメチルエタノールアミン34.5gを脱イオン水0.4kgに溶解した液を添加し、40℃で12時間撹拌してpH9.9の薄片状チタン酸分散液を得た。10000rpmで10分間遠心することにより濃度5.0重量%に調製した。得られた薄片状チタン酸分散液は長時間静置しても固形分の沈降は見られず、それを110℃で12時間乾燥した固形分は、TG/DTA分析により200℃以上の重量減少が14.7重量%、XRD分析により層間距離が10.3Åであった。   While dispersing and stirring the total amount of layered titanic acid obtained in 1.6 kg of deionized water, a solution prepared by dissolving 34.5 g of dimethylethanolamine in 0.4 kg of deionized water was added and stirred at 40 ° C. for 12 hours. Thus, a flaky titanic acid dispersion having a pH of 9.9 was obtained. The concentration was adjusted to 5.0% by weight by centrifugation at 10,000 rpm for 10 minutes. The obtained flaky titanic acid dispersion did not show solid sedimentation even after standing for a long time, and the solid content obtained by drying it at 110 ° C. for 12 hours showed a weight loss of 200 ° C. or more by TG / DTA analysis. Was 14.7% by weight, and the interlayer distance was 10.3 mm by XRD analysis.

(合成例2)
合成例1の薄片状チタン酸分散液200gを脱イオン水で濃度1.7重量%に調製し、撹拌しながら5重量%炭酸セシウム水溶液120gを添加し、室温で1時間撹拌して、薄片状チタン酸の層間イオンをジメチルエタノールアンモニウムからセシウムイオンに置換した。10000rpmで10分間遠心して上澄みを分取後、沈降した濃縮薄片状チタン酸分散液を脱イオン水で再希釈する操作を3回繰り返すことにより、過剰の炭酸セシウムおよび脱離ジメチルエタノールアミンを上澄みとともに除去した。その後、炭酸ガスをバブリングすることによりpHを7.9に調製し、再遠心することにより濃度を5.0重量%に調製した。得られた薄片状チタン酸分散液を長時間静置して固形分の沈降は見られず、110℃で12時間乾燥した固形分は、TG/DTA分析により200℃以上の重量減少が1.8重量%、XRD分析により層間距離が9.3Å、蛍光X線分析によりCs2Oの含有量が20.2重量%であった。
(Synthesis Example 2)
200 g of the flaky titanic acid dispersion of Synthesis Example 1 was prepared with deionized water to a concentration of 1.7 wt%, 120 g of a 5 wt% aqueous cesium carbonate solution was added while stirring, and the mixture was stirred at room temperature for 1 hour, Intercalation ions of titanic acid were replaced with cesium ions from dimethylethanolammonium. After centrifuging at 10,000 rpm for 10 minutes, the supernatant was collected, and the operation of re-diluting the sedimented concentrated flaky titanic acid dispersion with deionized water was repeated three times to remove excess cesium carbonate and desorbed dimethylethanolamine together with the supernatant. Removed. Thereafter, the pH was adjusted to 7.9 by bubbling carbon dioxide, and the concentration was adjusted to 5.0% by weight by re-centrifuging. The obtained flaky titanic acid dispersion was allowed to stand for a long time, and no solid content was observed. The solid content dried at 110 ° C. for 12 hours had a weight loss of 200 ° C. or more by TG / DTA analysis. It was 8% by weight, the interlayer distance was 9.3 mm by XRD analysis, and the Cs 2 O content was 20.2% by fluorescent X-ray analysis.

本実施の形態において、上述した製造方法で得られた鱗片状のチタン酸顔料は、主に、図7に示すような厚さ50nmでその長手方向の長さ(粒径)が15μmのものが用いられ、この鱗片状チタン酸顔料のアスペクト比(厚みと長手方向の長さとの比)は250〜400である。このように極薄の鱗片状チタン酸顔料は、他の顔料に比べ、超高アスペクト比であり、したがって、ベース塗膜中に高配向で緻密に並び、紫外線暴露により黒色化させることによって、漆黒感の高い黒真珠色塗膜を得ることができる。また、極薄の鱗片状チタン酸顔料が、緻密に高配向しているため、仮にクリア塗膜から酸素がベース塗膜に透過してきても、クリア塗膜との境界面のベース塗膜にしか酸素が透過せず、ベース塗膜の厚み方向にほとんど酸素が到達せず、酸素による酸化を抑制することができ、その結果、黒色化した黒色顔料のままでベース塗膜に存在させることができる。   In the present embodiment, the scaly titanate pigment obtained by the above-described production method mainly has a thickness of 50 nm as shown in FIG. 7 and a length (particle diameter) in the longitudinal direction of 15 μm. The aspect ratio (ratio of thickness to length in the longitudinal direction) of the scaly titanate pigment used is 250 to 400. In this way, ultrathin scaly titanate pigments have an ultra-high aspect ratio compared to other pigments. Therefore, by arranging them in a highly oriented and densely aligned base film and blackening by exposure to ultraviolet rays, jet black It is possible to obtain a black pearl coating film having a high feeling. In addition, because the ultrathin scaly titanate pigment is densely and highly oriented, even if oxygen permeates from the clear coating to the base coating, it is only applied to the base coating at the boundary with the clear coating. Oxygen does not permeate, oxygen hardly reaches in the thickness direction of the base coating film, and oxidation by oxygen can be suppressed, and as a result, the black pigment can remain in the base coating film as it is. .

また、鱗片状の酸化チタン顔料は、通常、厚さ10〜200nmでその長手方向の長さ(粒径)が10〜30μmのものが用いられ、この鱗片状チタン酸顔料のアスペクト比(厚みと長手方向の長さとの比)は50〜3000である。   In addition, the scaly titanium oxide pigment is usually used having a thickness of 10 to 200 nm and a length (particle diameter) in the longitudinal direction of 10 to 30 μm. The aspect ratio (thickness and thickness) of the scaly titanate pigment is used. The ratio to the length in the longitudinal direction is 50 to 3000.

また、アルミナ表面に酸化チタン膜が被覆された鱗片状の酸化チタン化合物被覆アルミナ顔料は、図8に示すように、その厚みが400〜500nmであり、その長手方向の長さ(粒径)が約20μmであり、そのアスペクト比が40〜50である。また、マイカ表面に酸化チタン膜が被覆された鱗片状の酸化チタン化合物被覆マイカ顔料も、上記鱗片状の酸化チタン化合物被覆アルミナ顔料と同様の厚み、粒径およびアスペクト比を有する。   Moreover, as shown in FIG. 8, the scaly titanium oxide compound-coated alumina pigment having a titanium oxide film coated on the alumina surface has a thickness of 400 to 500 nm and a length in the longitudinal direction (particle size). The aspect ratio is about 40-50. Moreover, the scaly titanium oxide compound-coated mica pigment having a mica surface coated with a titanium oxide film has the same thickness, particle size, and aspect ratio as the scaly titanium oxide compound-coated alumina pigment.

上記チタン酸顔料、酸化チタン化合物被覆アルミナ顔料および酸化チタン化合物被覆マイカ顔料は、上記チタン酸顔料に比べ、その厚みが厚く、アスペクト比も小さいため、ベース塗膜中に配向性はチタン酸顔料より低くなるものの、酸素がベース塗膜の厚み方向に透過していくことを抑制できる程度に緻密に配向している場合、光照射後に黒色化した黒色顔料によって、深みのある黒真珠色塗膜を得ることができる。なお、チタン酸顔料に比べ緻密性、配向性がやや劣るため、クリア塗膜から透過してくる酸素が黒色化ベース塗膜の厚み方向のやや深くところまで浸透する。これにより、クリア塗膜との境界面からやや深いところまでに存在するベース塗膜の黒色顔料は、酸化され白色化する。その結果、得られる黒真珠色塗膜の漆黒性はやや低下する傾向がある。   The titanate pigment, titanium oxide compound-coated alumina pigment, and titanium oxide compound-coated mica pigment are thicker and have a smaller aspect ratio than the titanate pigment. If the orientation is dense enough to prevent oxygen from penetrating in the thickness direction of the base coating, a deep black pearl coating will be formed by the black pigment blackened after light irradiation. Obtainable. Since the denseness and orientation are slightly inferior to those of titanate pigments, oxygen permeated from the clear coating penetrates to a slightly deeper position in the thickness direction of the blackened base coating. As a result, the black pigment of the base coating film that exists slightly deep from the boundary surface with the clear coating film is oxidized and whitened. As a result, the jetness of the black pearl coating film obtained tends to be somewhat lowered.

ここで、上記酸化チタン顔料および酸化チタン被覆顔料における酸素による酸化反応は次の通りである。   Here, the oxidation reaction with oxygen in the titanium oxide pigment and the titanium oxide-coated pigment is as follows.

(化2)
TiO2-x →TiO2
Ti2-y3-x →Ti23
この酸化反応によって、酸化された顔料は白色化する。
(Chemical formula 2)
TiO 2-x → TiO 2
Ti 2-y O 3-x → Ti 2 O 3
By this oxidation reaction, the oxidized pigment turns white.

また、上記鱗片状のチタン酸顔料、鱗片状の酸化チタン化合物被覆顔料、鱗片状の酸化チタン化合物被覆アルミナ顔料および鱗片状の酸化チタン化合物被覆マイカ顔料は、上述のベース塗料に、含有率PWC(pigment wright content:塗料の樹脂に対する固形分含量)15〜30%で含有されている。   In addition, the scale-like titanic acid pigment, the scale-like titanium oxide compound-coated pigment, the scale-like titanium oxide compound-coated alumina pigment, and the scale-like titanium oxide compound-coated mica pigment are contained in the above-mentioned base paint in a content ratio PWC ( (pigment wright content: solid content with respect to resin of paint) 15-30%.

なお、上述したように、上記極薄鱗片状チタン酸顔料の製造方法では、層状チタン酸に有機塩基性化合物を作用させ、層間を剥離することにより、薄片状チタン酸の水性媒体分散液(剥離ゲル)が得られる。図10に示すように、この剥離ゾルに紫外線を照射して黒色化を行うことも想定されるが、剥離ゾル内に存在するアミン類が紫外線により変性して、剥離ゾル自体が黄変してしまい、良好な黒色顔料は得られない。   As described above, in the method for producing the ultrathin scaly titanate pigment, an organic basic compound is allowed to act on the layered titanic acid, and the interlayer is peeled off to separate the aqueous flake titanic acid dispersion (peeling). Gel). As shown in FIG. 10, it is assumed that the peeling sol is irradiated with ultraviolet rays to blacken it, but the amines present in the peeling sol are denatured by the ultraviolet rays, and the peeling sol itself turns yellow. As a result, a good black pigment cannot be obtained.

また、上述したように、ベース塗膜上にクリア塗膜を形成した後に焼き付けを行う、又はベース塗膜を焼き付け硬化させた後にクリア塗膜を形成し焼き付けを行うことによって、チタン酸顔料を用いたベース塗料によって形成されたベース塗膜から、光変性を起こすアミン類を除去することができる。   In addition, as described above, the titanate pigment is used by baking after forming a clear coating on the base coating, or by baking after forming the clear coating after baking the base coating. It is possible to remove amines that cause photo-denaturation from the base coating film formed by the base paint.

[黒真珠色塗膜]
本実施の形態の黒真珠色塗膜は、上述の黒真珠色塗膜の形成方法により形成された黒真珠色塗膜であり、図1および図2に示すように、上述した鱗片状のチタン酸顔料、鱗片状の酸化チタン顔料、鱗片状の酸化チタン化合物被覆アルミナ顔料又は鱗片状の酸化チタン化合物被覆マイカ顔料を光、特に紫外線によって還元され黒色化された黒色鱗片状顔料が高配向で且つ緻密に並んだ状態の黒色化ベース塗膜16を有する黒真珠色塗膜である。
[Black pearl coating]
The black pearl color coating film of the present embodiment is a black pearl color coating film formed by the above-described method of forming a black pearl color coating film. As shown in FIGS. Acid pigments, scaly titanium oxide pigments, scaly titanium oxide compound-coated alumina pigments or scaly titanium oxide compound-coated mica pigments are highly oriented, especially black scaly pigments that have been reduced and blackened by ultraviolet rays. It is a black pearl color coating film having the blackened base coating film 16 in a densely arranged state.

黒色化した黒色鱗片状顔料が、黒色化ベース塗膜中に緻密に高配向しているため、漆黒感の高い黒真珠色の塗膜が得られるとともに、緻密に高配向した黒色鱗片状顔料により酸素透過が抑制され、黒色化ベース塗膜中の黒色鱗片状顔料は安定的に黒色で保持される。さらに、黒色化ベース塗膜中の黒色鱗片状顔料が酸素による酸化され、白色化したとしても、クリア塗膜との境界面からベース塗膜の厚み方向にしたがって、白色から灰色、黒色に色調が傾向変化してゆくので、深み感が表現できる。   Because the blackened black scaly pigment is densely and highly oriented in the blackened base paint film, a black pearly paint film with high jetness is obtained, and the densely highly oriented black scaly pigment Oxygen permeation is suppressed, and the black scaly pigment in the blackened base coating film is stably held in black. Furthermore, even if the black scaly pigment in the blackened base coating is oxidized and whitened by oxygen, the color tone changes from white to gray and black according to the thickness direction of the base coating from the boundary surface with the clear coating. As the trend changes, you can express a sense of depth.

以下に、本発明の黒真珠色塗膜の形成方法について、実施例を用いて説明する。   Below, the formation method of the black pearl color coating film of this invention is demonstrated using an Example.

本実施例では、以下の塗料を用いた。すなわち、中塗塗料として、ポリエステル樹脂とメラミン樹脂とを基材樹脂とする塗料を用いた。また、ベース塗料として、アクリル樹脂とメラミン樹脂とを基材樹脂とし、上述した平均厚さ50nmでその長手方向の平均長さ(粒径)が15μmである鱗片状チタン酸顔料を含有率PWC20%で含有する塗料を用いた。さらに、クリア塗料として、アクリル樹脂・メラミン樹脂・酸アクリル樹脂/エポキシアクリル樹脂の2液型ウレタン樹脂からなる基材樹脂を含有する塗料を用いた。   In this example, the following paints were used. That is, a paint having a polyester resin and a melamine resin as the base resin was used as the intermediate coating. Further, as a base coating material, a scale-like titanate pigment having an average thickness of 50 nm and an average length (particle diameter) in the longitudinal direction of 15 μm as an acrylic resin and a melamine resin as described above is contained in a PWC content of 20%. The paint contained in was used. Further, as the clear paint, a paint containing a base resin composed of a two-component urethane resin of acrylic resin, melamine resin, acid acrylic resin / epoxy acrylic resin was used.

図3を用いて、本実施例の塗膜形成方法を説明する。まず、電着済みの鋼板に二酸化チタン顔料を含有する白中塗り塗料を膜厚35μmとなるように塗装し、最高到達温度140℃で18分間焼き付けを行った。あるいは、さらに着色ベース塗膜を35μmとなるように塗装し、140℃、18分間焼き付けを行った。次いで、鱗片状チタン酸顔料含有ベース塗料を、ベース塗料が水性ベース塗料である場合、膜厚13μmで塗装し、ベース塗料が溶剤系ベース塗料の場合には、膜厚15μmで塗装した。ここで、水性ベース塗料を用いた場合、最高到達温度80℃で10分間焼き付けを行い、溶剤系ベース塗料を用いた場合には、フラッシュタイムを1分間設けた。ここで、フラッシュタイムとは、ベース塗料を塗布した後、クリア塗料を塗布するまでの時間をいう。その後、ベース塗膜上に膜厚35μmとなるように紫外線吸収剤を含まないクリア塗料を塗布し、最高到達温度140℃で18分間保持して焼き付けを行った。次に、クリア塗膜上に、紫外線を照度230W・s/m2で60〜250分間照射した。 The coating film formation method of a present Example is demonstrated using FIG. First, a white intermediate coating containing a titanium dioxide pigment was applied to an electrodeposited steel sheet so as to have a film thickness of 35 μm, and baked at a maximum temperature of 140 ° C. for 18 minutes. Alternatively, a colored base coating film was further applied to 35 μm and baked at 140 ° C. for 18 minutes. Next, the scaly titanate pigment-containing base paint was applied with a film thickness of 13 μm when the base paint was an aqueous base paint, and was applied with a film thickness of 15 μm when the base paint was a solvent-based base paint. Here, when a water-based base paint was used, baking was performed for 10 minutes at a maximum temperature of 80 ° C., and when a solvent-based base paint was used, a flash time was provided for 1 minute. Here, the flash time refers to the time from applying the base paint to applying the clear paint. Thereafter, a clear paint not containing an ultraviolet absorber was applied on the base coating film so as to have a film thickness of 35 μm, and baked by holding at a maximum temperature of 140 ° C. for 18 minutes. Next, ultraviolet rays were irradiated on the clear coating film at an illuminance of 230 W · s / m 2 for 60 to 250 minutes.

マルチアングル測色計「X−Rite MA68II」(X−Rite社製)を用い、入射角45°、受光角45°にてL*値を測定した結果を、図11に示す。図11に示すように、紫外線照射により紫外線がクリア塗膜を介してベース塗膜中の極薄鱗片状チタン酸顔料を黒色化し、さらに中塗塗膜中の二酸化チタン顔料をも黒色化してゆくため、L*値は、78から72まで低下し、後に71になった。ここで、L*値が低いほど、黒色が濃いことを示し、図11より、極めて漆黒性の高い黒真珠色塗膜が得られたことがわかる。 FIG. 11 shows the result of measuring the L * value using a multi-angle colorimeter “X-Rite MA68II” (manufactured by X-Rite) at an incident angle of 45 ° and a light-receiving angle of 45 °. As shown in FIG. 11, ultraviolet rays are irradiated with ultraviolet rays so that the ultrathin scaly titanate pigment in the base coating film is blackened through the clear coating film, and the titanium dioxide pigment in the intermediate coating film is also blackened. , L * value decreased from 78 to 72 and later became 71. Here, it shows that black is dark, so that L * value is low, and it turns out that the black nacreous coating film with extremely high jetness was obtained from FIG.

本発明の黒真珠色塗膜の形成方法および黒真珠色塗膜は、深みのある漆黒性の高い黒真珠色塗装を必要とする用途であれば、いかなる用途にも有効であるが、例えば車両用塗膜、家電製品用塗膜の形成に供することができ、特に車両用塗膜としては、車両用部品、例えばインパネ、ドアノブなどの塗膜形成に供することができる。   The method for forming a black pearl color coating film of the present invention and the black pearl color coating film are effective for any application as long as the application requires a deep jet blackness black pearl color coating. It can be used for forming coating films for home appliances and coating films for home appliances. Particularly, as a coating film for vehicles, it can be used for forming coating films for vehicle parts such as instrument panels and door knobs.

本発明の黒真珠色塗膜の形成方法の一態様を説明する図である。It is a figure explaining the one aspect | mode of the formation method of the black pearl color coating film of this invention. 本発明の黒真珠色塗膜の形成方法の他の態様を説明する図である。It is a figure explaining the other aspect of the formation method of the black pearl color coating film of this invention. 本発明の黒真珠色塗膜の形成方法の一態様の工程のフロー図である。It is a flowchart of the process of 1 aspect of the formation method of the black pearl color coating film of this invention. 本発明の黒真珠色塗膜の形成方法に得られた積層塗膜の一例の断面図である。It is sectional drawing of an example of the laminated coating film obtained by the formation method of the black pearl coating film of this invention. 本発明の黒真珠色塗膜の形成方法に供するチタン酸顔料の製造方法の一例を説明する図である。It is a figure explaining an example of the manufacturing method of the titanate pigment with which it uses for the formation method of the black pearl color coating film of this invention. 本発明の黒真珠色塗膜に用いるチタン酸顔料とそのベース塗膜中の配向度合いを説明する図である。It is a figure explaining the orientation degree in the titanic acid pigment used for the black pearl color coating film of this invention, and its base coating film. 本発明の黒真珠色塗膜の形成方法に用いるチタン酸顔料の一例を説明する図である。It is a figure explaining an example of the titanate pigment used for the formation method of the black pearl color coating film of this invention. 酸化チタン被膜アルミナ顔料の一例を説明する図である。It is a figure explaining an example of a titanium oxide coat alumina pigment. 本発明の黒真珠色塗膜の形成方法を用いて形成されたチタン酸顔料含有ベース塗膜の断面を撮影した走査電子顕微鏡写真である。It is the scanning electron micrograph which image | photographed the cross section of the titanic acid pigment containing base coating film formed using the formation method of the black pearl color coating film of this invention. チタン酸顔料製造工程の途中で得られるチタン酸剥離ゲルに紫外線照射した状態を説明する図である。It is a figure explaining the state which irradiated the ultraviolet-ray to the titanic acid peeling gel obtained in the middle of a titanate pigment manufacturing process. 本実施例における紫外線照射時間と黒真珠色塗膜のL*値との関係を示すグラフである。It is a graph which shows the relationship between the ultraviolet irradiation time in a present Example, and the L * value of a black pearl coating film. 従来の黒真珠色塗膜の構成を説明する図である。It is a figure explaining the structure of the conventional black pearl color coating film.

符号の説明Explanation of symbols

10 中塗塗膜、12 ベース塗膜、14 クリア塗膜、16 黒色化ベース塗膜。   10 intermediate coating film, 12 base coating film, 14 clear coating film, 16 blackened base coating film.

Claims (8)

鱗片状の酸化チタン化合物顔料又は鱗片状の酸化チタン化合物被覆顔料を含有するベース塗料を中塗塗膜上あるいは着色ベース塗膜上に塗布してベース塗膜を形成するベース塗膜形成工程と、
前記ベース塗膜上に光吸収剤を含まないクリア塗膜を形成するクリア塗膜形成工程と、
酸化チタン化合物を還元可能な光を前記クリア塗膜上から照射し前記酸化チタン化合物を黒色化させる光照射工程と、
を有することを特徴とする黒真珠色塗膜の形成方法。
A base coating film forming step of forming a base coating film by applying a base coating containing a scaly titanium oxide compound pigment or a scaly titanium oxide compound-coated pigment on an intermediate coating film or a colored base coating film;
A clear coating film forming step of forming a clear coating film containing no light absorber on the base coating film;
A light irradiation step of irradiating light capable of reducing the titanium oxide compound from above the clear coating film to blacken the titanium oxide compound;
A method for forming a black pearl coating film, comprising:
請求項1に記載の黒真珠色塗膜の形成方法において、
前記クリア塗膜形成工程と光照射工程との間に、少なくとも前記中塗塗膜とベース塗膜とクリア塗膜とを焼き付ける焼付工程を有することを特徴とする黒真珠色塗膜の形成方法。
In the formation method of the black pearl color coating film of Claim 1,
A method for forming a black pearl coating film, comprising a baking step of baking at least the intermediate coating film, the base coating film, and the clear coating film between the clear coating film forming process and the light irradiation process.
請求項1または請求項2に記載の黒真珠色塗膜の形成方法において、
前記中塗塗膜は、酸化チタン化合物顔料を含む白中塗塗膜あるいは着色ベース塗膜であることを特徴とする黒真珠色塗膜の形成方法。
In the formation method of the black pearl color coating film of Claim 1 or Claim 2,
The method for forming a black pearl coating film, wherein the intermediate coating film is a white intermediate coating film or a colored base coating film containing a titanium oxide compound pigment.
請求項1から請求項3のいずれか1項に記載の黒真珠色塗膜の形成方法において、
前記鱗片状の酸化チタン化合物顔料は、鱗片状の酸化チタン顔料または鱗片状のチタン酸顔料であることを特徴とする黒真珠色塗膜の形成方法。
In the formation method of the black pearl color coating film of any one of Claims 1-3,
The method for forming a black pearl coating film, wherein the scaly titanium oxide compound pigment is a scaly titanium oxide pigment or a scaly titanate pigment.
請求項1から請求項3のいずれか1項に記載の頃真珠色塗膜の形成方法において、
前記鱗片状の酸化チタン化合物被覆顔料は、鱗片状アルミナ表面を酸化チタンにより被覆した顔料またはマイカ表面を酸化チタンにより被覆した顔料であることを特徴とする黒真珠色塗膜の形成方法。
In the formation method of the pearl color coating film of any one of Claims 1-3,
The method for forming a black pearl coating film, wherein the scaly titanium oxide compound-coated pigment is a pigment in which a scaly alumina surface is coated with titanium oxide or a mica surface is coated with titanium oxide.
請求項1から請求項5のいずれか1項に記載の黒真珠色塗膜の形成方法において、
前記酸化チタン化合物を還元可能な光は、紫外線であり、
前記光吸収剤は、紫外線吸収剤であることを特徴とする黒真珠色塗膜の形成方法。
In the formation method of the black pearl color coating film of any one of Claims 1-5,
The light capable of reducing the titanium oxide compound is ultraviolet light,
The said light absorber is a ultraviolet absorber, The formation method of the black pearl color coating film characterized by the above-mentioned.
請求項1から請求項6のいずれか1項に記載の黒真珠色塗膜の形成方法により形成された黒真珠色塗膜。   The black pearl color coating film formed by the formation method of the black pearl color coating film of any one of Claims 1-6. 照射光により還元され黒色化した黒色鱗片状顔料が高配向で且つ緻密に並んだ状態で存在する塗膜を少なくとも1層含むことを特徴とする黒真珠色塗膜。
A black pearl-colored coating film comprising at least one coating film in which black scale pigments reduced and blackened by irradiation light are present in a highly aligned and densely arranged state.
JP2005085030A 2005-03-23 2005-03-23 Method for forming black pearl color coating film and black pearl color coating film Pending JP2006263569A (en)

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