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Pearlescent pigments with large aspect ratio and a method of their preparation

A pearlescent pigment and metal technology, applied in the wet preparation of dyed pigments, chemical instruments and methods, fibrous fillers, etc., can solve the problems of small and large aspect ratio, difficult to display satisfactory gloss, large aspect ratio and small etc.

Active Publication Date: 2009-09-16
KOREA RES INST OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the excellent performance in pearlescent pigment matrix, the method of using titanium dioxide as an additive does not include an aging step, and there are problems of large aspect ratio, non-uniform particle size and dispersion
[0011] However, ordinary flaky crystals have relatively large aspect ratios, so when coated with metals or metal oxides, it is difficult to show satisfactory luster due to interference colors

Method used

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  • Pearlescent pigments with large aspect ratio and a method of their preparation
  • Pearlescent pigments with large aspect ratio and a method of their preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] By mixing 670 g of aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 O), 345g of sodium sulfate (Na 2 SO 4 ), 280g of potassium sulfate (K 2 SO 4 ), and 1.5g34% zinc sulfate (ZnSO 4 ·7H 2 O) aqueous solution to prepare a homogeneous mixture solution. By dissolving 324g of sodium carbonate (Na 2 CO 3 ) and 2.7g of sodium phosphate ((NaPO 3 ) 6 ) to prepare an alkaline solution. While stirring, the aluminum sulfate mixed solution (65° C.) was titrated with an alkali solution at a rate of 25 ml / min to adjust the pH to 6.8 to prepare a gel mixed with pseudoboehmite and a flux. Then, the hybrid gel was aged at 90°C for 20 hours, vacuum distilled at 60°C, and dried at 110°C for 20 hours. Flaky α-alumina crystals were prepared by pulverizing the dried mixed gel to a size of about less than 5 mm, and performing crystallization in an alumina crucible (2 L) at 1200° C. for 7 hours. The flux was separated from the flaky α-alumina crystals by cooling the crucible to room temper...

Embodiment 2

[0065] Transparent flaky α-alumina crystals were prepared in the same manner as in Preliminary Example 1 except that 3 g of 34% zinc sulfate was used.

[0066] The obtained flaky α-alumina crystals were confirmed to have an average particle thickness of 0.22 μm and an average particle size of 18.3 μm. Atomic analysis revealed the presence of 0.2 parts by weight of zinc oxide.

[0067] Embodiment: prepare pearlescent pigment

[0068] Example 1:

[0069] The flaky α-alumina particles (100 g) prepared in Preliminary Example 1 were suspended in deionized water (2 L), and the temperature was raised to 70°C. Chloric acid (5%) was added to adjust the pH to 2 and stirred for 30 minutes. By adding 40% TiOCl 2 and sodium hydroxide solution to form TiO(OH) on the surface of α-alumina particles 2 coating. With TiOCl 2 And the addition amount of sodium hydroxide solution increases, and the color changes to the interference color of silver (75nm), gold (110nm), red (130nm), purple (1...

Embodiment 3

[0073] The flaky α-alumina particles (100 g) prepared in Preliminary Example 1 were suspended in deionized water (2 L), and the temperature was raised to 70°C. Chloric acid (5%) was added to adjust the pH to 2 and stirred for 30 minutes. By adding 60ml of 5% SnCl 4 ·5H 2 O solution and sodium hydroxide solution to form TiO(OH) on the surface of α-alumina particles 2 coating. Add TiOCl 2 and sodium hydroxide solution until a golden color is obtained, followed by stirring for more than 30 minutes. Aqueous sodium hydroxide solution was added to adjust the pH to 3. Ferric chloride solution was added until the desired color (pearl gray) was obtained, followed by filtration, washing and drying. Calcination was carried out at 900° C. to provide a coating of titanium dioxide and iron oxide (125 nm) on the surface of the flaky α-alumina particles.

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Abstract

The present invention relates to a pearlescent pigment with large aspect ratio and a method of their preparation, and particularly to pearlescent pigments prepared by coating a metal or metal precursor on the flaky alpha-alumina crystals obtained by using an aluminum precursor aqueous solution and a zinc precursor aqueous solution as main ingredients. The crystals herein has an average particle thickness of 0.5 [mu]m or less, an average particle diameter of 15 [mu]m or higher and a large aspect ratio of 50 or higher, thereby being superior in gloss. The crystals show metal colors and interference colors of silver, gold, red, purple, blue and green.

Description

[technical field] [0001] The present invention relates to a pearlescent pigment with a large aspect ratio (large aspect ratio) and a preparation method thereof, in particular to a pearlescent pigment prepared by coating a metal or a metal precursor on a flaky α-alumina crystal, the flaky α-alumina Aluminum crystals are obtained by using an aluminum precursor aqueous solution and a zinc precursor aqueous solution as main components. The crystals herein have an average particle thickness equal to or less than 0.5 μm, an average particle diameter equal to or greater than 15 μm, and a large aspect ratio equal to or greater than 50, thus having superior gloss. The crystals exhibit metallic and interference colors of silver, gold, red, violet, blue and green. [Background technique] [0002] The important properties of pearlescent pigments as a matrix are particle size, shape, surface properties and refractive index. That is, since the ratio of reflected light to transmitted ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/40
CPCC09C1/0015C01G9/00C01P2004/54C09C2200/308C09C1/0021C01P2002/72C09C2200/301C09C1/0078C09C2200/1008C09C2200/1004C09C2220/10C09C1/407
Inventor 李正敏朴昞基徐廷权崔东旭张吉琓林光水赵晟伦姜光中
Owner KOREA RES INST OF CHEM TECH
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