Glass-ceramic discs for use in pigments

A technology of glass flakes and liquid glass, which is applied in the direction of pigment slurry, glass manufacturing equipment, wet preparation of dyed pigments, etc., can solve the problems of low softening temperature, low chemical stability, unstable mechanical properties, etc., and achieve high shape stability sexual effect

Inactive Publication Date: 2011-05-04
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the glass flakes described therein have the disadvantage that they preferably contain high levels of toxic heavy metals such as lead, arsenic or antimony
Glasses with a higher content ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Example 1: Preparation of glass compositions with crystalline phases

[0094] Melt quartz sand, titanium dioxide, borax and soda in a platinum crucible at 1350°C to form liquid glass. The composition of the glass is, in % by weight:

[0095] 46 wt% SiO 2 ,

[0096] 16 wt% B 2 o 3 ,

[0097] 14 wt% Na 2 O,

[0098] 24 wt% TiO 2 .

[0099] The glass is poured into molds, cooled rapidly and solidified. Thin sections were made from the obtained glass blocks. The glass is colorless and transparent with a refractive index of 1.64. The glass is X-ray amorphous.

[0100] The glass samples thus produced were annealed at 650° C. for 30 minutes and at 750° C. for a further 3 hours, and then cooled. The glass is now whitish-opaque. The refractive index of this glass is 1.76.

[0101] The detection by means of X-ray diffraction (powder X-ray diffractometer Stoe Stadi 611KL, Cu-Kα1-radiation) confirmed the presence of TiO in the rutile modification in the glass 2 . ...

Embodiment 2

[0102] Example 2: Preparation of glass compositions with crystalline phases

[0103] Melt quartz sand, titanium dioxide, niobium oxide, borax and soda in a platinum crucible at 1350°C to form liquid glass. The composition of the glass is, in % by weight:

[0104] 12 wt% SiO 2 ,

[0105] 14 wt% B 2 o 3 ,

[0106] 12 wt% Na 2 O,

[0107] 16 wt% TiO 2 ,

[0108] 46 wt% Nb 2 o 3 .

[0109] The glass is poured into molds, cooled rapidly and solidified. Thin sections were made from the resulting glass block. The glass is colorless and transparent, and has a refractive index of 1.85 to 1.9.

[0110] The glass samples thus produced were annealed at 650° C. for 30 minutes and at 800° C. for 3 hours, and then cooled. The glass is now opaque and exhibits a pronounced nacreous luster. The index of refraction is 2.

[0111] The presence of rutile TiO in the glass was confirmed by detection by means of X-ray diffraction (powder X-ray diffractometer Stoe Stadi 611KL, °Cu-K...

Embodiment 3

[0112] Example 3: Preparation of glass flakes

[0113] The glass composition of Example 1 was melted in a platinum bath and discharged at 1050° C. through a nozzle into a flaker apparatus with a rotating cup. A glass flake with a thickness of about 1.2 μm is obtained. The glass flakes were ground and classified by means of an air jet mill.

[0114] 100 g of glass flakes from Example 3 were stirred in 1 L of water at 80° C. and pH 1.8 for 48 hours, during which the pH was adjusted and kept constant with hydrochloric acid. During this time, the sodium ions were fully eluted and 14.5 g of HCl was consumed. The flakes were then filtered off, dried and fired at 800° C. for 1 hour. A silver-white pigment powder is obtained. The pigment powder was mixed into the nitrocellulose lacquer and spread on a paint card (Lackkarte). A silvery-white varnish layer with a pronounced sparkle effect is obtained.

[0115] The UV / Vis-spectra were recorded for unfired and fired glass flake sa...

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Abstract

The present invention relates to a glass composition having crystalline phases and glass discs produced therefrom. Said glass discs can be used as a basis substrate for effect pigments. The glass discs can further be used in dyes, paints, printing inks, plastics, and in cosmetic formulations. The glass discs are converted into glass ceramics and are located in one of the following composition ranges I or II in weight %: I: 40-50 SiO2, 10-20 B2O3, 10-20 Na2O, 15-30 TiO2; II: 10-60 SiO2, 5-30 B2O3, 5-40 TiO2, 2-20 Nb2O5, 2-20 Fe2O3, 5-40 Na2O+K2O+CaO+SrO+BaO.

Description

technical field [0001] The present invention relates to glass compositions comprising a crystalline phase, and glass flakes composed thereof. These glass flakes can be used as base substrates for effect pigments. The glass flakes can also be used in paints, coatings, printing inks, plastics and cosmetic formulations. Background technique [0002] Effect pigments based on glass flakes are well known in the art. Thus, for example, US-patent 2,863,783 describes thin glass flakes composed of highly refractive glass. These glass flakes are used as pearlescent pigments in paints and plastics. However, the glass flakes described therein have the disadvantage that they preferably contain high levels of toxic heavy metals such as lead, arsenic or antimony. Glasses with a higher content of heavy metal oxides generally have lower softening temperatures and, in flake form, are mechanically unstable at high temperatures. In addition, the glass flakes generally have low chemical stab...

Claims

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Application Information

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IPC IPC(8): C03C10/02C09C1/00C09D5/36C09D7/12C09D17/00C03C17/23C03C17/25C03B37/005C03C23/00C03C12/00C09D7/62
CPCC01P2006/42C03B37/005C03C10/0009C03C10/0054C03C12/00C03C17/23C03C17/25C03C17/256C03C23/00C03C23/007C03C23/008C03C2217/211C03C2217/212C03C2217/213C03C2217/214C03C2217/217C03C2217/23C08K3/40C08K9/02C09C1/0018C09C1/0021C09C1/0024C09C1/0039C09C1/0051C09C1/0066C09C2200/102C09C2200/301C09C2220/10C09D5/36C09D17/007Y10T428/2996Y10T428/2982C09D7/62
Inventor R·儒格尔A·盖森G·卡恩
Owner MERCK PATENT GMBH
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