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Coated pearlescent pigments with SiO2 and cerium oxide

A technology of pearlescent pigments and cerium oxide, which is applied in the field of pearlescent pigments to achieve the effect of improving UV stability and excellent optical properties

Active Publication Date: 2007-08-29
ECKART GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pearlescent pigments disclosed in EP 1 084 198 B1 are not age-stable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] A commercially available blue pearlescent pigment (PHOENIX PX 2261, supplied by Eckart) based on coated TiO 2 100 grams of the pearlescent pigment is suspended in 300 ml of isopropanol and the suspension is boiled. While stirring, initially add 2.0 g of H 2 O, followed by the addition of 2.17 g Ce(NO 3 ) 3 Solution in 100 g of isopropanol. Then, add 0.45 g of ethylenediamine in 3.0 g of H 2 solution in O. Thereafter, 10.6 g of tetraethoxysilane and 22 g of isopropanol were added continuously within 2 hours using a metering pump (Ismatec). The suspension was then reacted for a further 6 hours. Then 0.4 grams of Dynasylan AMEO and 1.3 grams of Dynasylan 9116 were added and the solution was allowed to cool slowly. The mixture was stirred overnight at room temperature and then filtered with suction for 1 day. The filter cake of the pigment was dried under vacuum at 80°C.

[0140] The pigment has a theoretical Ce content of 0.7% by weight, SiO 2 The content is 3.0%...

Embodiment 2

[0142] A commercially available blue pearlescent pigment (PHOENIX PX 2261, supplied by Eckart) based on coated TiO 2 The fineness of the mica is 5-25 microns, and 100 grams of the pearlescent pigment is suspended in 900 grams of water. Then, at a pH of 2.4, 2.30 g of SnCl were metered in at a rate of 2 ml / min 4 ·5H 2 O in the solution of 45ml dilute hydrochloric acid, during, keep pH constant by dropping 20% ​​caustic soda simultaneously. After continuous stirring for 30 minutes, the solid was filtered off, washed with water and dried at 120°C.

[0143] The dried coating pigment was suspended in 300 ml of isopropanol and the suspension was brought to a boil. While stirring, first add 2.0 g of H 2 O, followed by the addition of 2.17 g Ce(NO 3 ) 3 ·6H 2 A solution of O in 100 g of isopropanol. Then, add 0.45 g of ethylenediamine in 8 g of H 2 O solution. Then, using a metering pump (Ismatec), 10.6 g of tetraethoxysilane and 20 g of isopropanol were added continuously w...

Embodiment 5 and 6

[0175] A commercially available blue pearlescent pigment (PHOENIX PX 2261, supplied by Eckart) based on coated TiO 2 100 g of the pearlescent pigment is suspended in 300 ml of isopropanol and the suspension is boiled. While stirring, first add 2.0 g of H 2 O, followed by the addition of 0.93 g Ce(NO 3 ) 3 ·6H 2 A solution of O in 8 g of isopropanol. Then, add 0.45 g of ethylenediamine in 3.0 g of H 2 O solution. Then, using a metering pump (Ismatec), a certain amount of tetraethoxysilane (see Table 3) and 22 g of isopropanol were added continuously within 2 hours. The suspension was then reacted for a further 6 hours. The mixture was stirred overnight at room temperature and then filtered with suction for 1 day. The filter cake of the pigment was dried under vacuum at 100°C for 6 hours.

[0176] Deposit different amounts of SiO in a similar manner 2 (See Table 3).

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Abstract

The invention relates to pearlescent pigments comprising a metal oxide-containing, lamellar substrate that is provided with a first and a second protective layer, the metal oxide having a refractive index of more than 1.8. A first protective layer comprising cerium oxide and / or cerium hydroxide as well as a second protective layer which is made of SiO2 and onto which an organic-chemical secondary coating containing at least one silane with at least one functional binding group and at least one silane without a functional binding group is applied, are provided, metal oxide layers that are different from cerium oxide and SiO2 being optionally placed between the first and the second protective layer. The invention also relates to a method for producing the disclosed pigments and the use thereof.

Description

field of invention [0001] The present invention relates to pearl luster pigments having a metal oxide-containing flake-type substrate with first and second protective layers, the metal oxide having a refractive index greater than 1.8. In addition, the present invention also relates to the preparation method and application of the pearlescent pigment. Background technique [0002] Contains titanium dioxide in the cover layer or consists of granular TiO 2 The formed pearlescent pigment has specific photocatalytic activity. If UV radiation acts on pearlescent pigments in the presence of water and oxygen, the UV activity of pearlescent pigments can lead to accelerated splitting of organic compounds such as binder matrices. Even the amount of UV radiation present in sunlight can produce this reaction, i.e. for applications with direct exposure to aggressive environments such as automotive coatings, specially stabilized pearlescent pigments must be used. To counteract the UV ra...

Claims

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Application Information

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IPC IPC(8): C09C1/00
CPCC09C1/0015C09C2200/401C09C2220/106C09C2200/408C09C2200/407C09C2200/1087C09C2200/1004C09C2200/102C09C1/00
Inventor F·亨莱因U·施米特P·克鲁格考皮
Owner ECKART GMBH & CO KG
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