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Process for synthesizing pearlescent pigment crystal

A pearlescent pigment and synthesis process technology, applied in lead carbonate and other directions, can solve the problems of optical stability, poor flash performance, poor flash performance, environmental pollution, etc., and achieve the effects of uniform crystal size, short production time, and reduced production costs.

Active Publication Date: 2008-08-20
临海市华宏涂料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a synthesis process for pearlescent pigment basic lead carbonate regular hexagonal crystals with high sparkle, thereby solving the disadvantages of poor optical stability and flash performance of pearlescent pigments in the prior art
[0004] The present invention also aims at the inability to make regular hexagons and interference pearlescent crystals existing in the existing synthesis of basic lead carbonate or other lead-containing compounds as pearlescent pigments, which not only has poor flash performance of the obtained product; Green, red, blue and other interference colors, and the disadvantage of forming free lead that pollutes the environment Provides a synthesis process for basic lead carbonate regular hexagonal crystals as pearlescent pigment crystals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 (the synthetic technique of N-type crystal)

[0028] a, the synthesis of intermediates:

[0029] Reaction formula: 3PbO+2CH 3 COOH+H 2 O→Pb(CH3COO) 2 2Pb(OH) 2

[0030] Add a certain amount of high-purity acetic acid (≥99.0%) according to the process ratio requirements, add the acetic acid concentration to be 3% (the weight ratio of acetic acid to the entire reaction solution), and put in a certain amount of acetic acid slowly while stirring for about 20 minutes after adding the acetic acid. A certain amount of lead oxide (≥99.99%), the concentration of lead ions is 1%, (the weight ratio of lead ions to the whole reaction solution). After the feeding is completed, after stirring and reacting for 15 minutes, put in the metered activated carbon, and pump fresh pure water (conductivity ≤ 0.5μS / cm) to a sufficient amount at the same time, continue stirring for about 5 minutes, turn off the stirring motor, and let it stand. After the feed liquid is clarifi...

Embodiment 2

[0040] Embodiment 2 (the synthetic technique of HG type crystal body)

[0041] a, the synthesis of intermediates:

[0042] Reaction formula: with embodiment 1

[0043] Add a certain amount of high-purity acetic acid (≥99.0%) according to the process ratio requirements, add the acetic acid concentration to be 2% (the weight ratio of acetic acid to the entire reaction solution), and put in a certain amount of acetic acid slowly while stirring for about 15 minutes after adding the acetic acid. A certain amount of lead oxide (≥99.99%), the concentration of lead ions is 3%, (the weight ratio of lead ions to the whole reaction solution). After the feeding is completed, after stirring and reacting for 25 minutes, put in the metered activated carbon, and pump fresh pure water (conductivity ≤ 0.2μS / cm) to a sufficient amount at the same time, continue stirring for about 10 minutes, turn off the stirring motor, and let it stand. After the feed liquid is clarified, the feed liquid is p...

Embodiment 3

[0053] Embodiment 3 (the synthetic technique of HGV type crystal body)

[0054] a, the synthesis of intermediates:

[0055] Reaction formula: with embodiment 1

[0056] Add a certain amount of high-purity acetic acid (≥99.0%) according to the process ratio requirements, add acetic acid concentration of 1% (the weight ratio of acetic acid to the entire reaction solution), and add a certain amount of acetic acid slowly while stirring for about 10 minutes after adding acetic acid. A certain amount of lead oxide (≥99.99%), the concentration of lead ions is 5%, (the weight ratio of lead ions to the whole reaction solution). After the feeding is completed, after stirring and reacting for 30 minutes, put in the metered activated carbon, and pump fresh pure water (conductivity ≤ 0.5μS / cm) to a sufficient amount at the same time, continue stirring for about 15 minutes, turn off the stirring motor, and let it stand. After the feed liquid is clarified, the feed liquid is pumped into th...

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Abstract

The invention provides a process for synthesizing pearl luster pigment crystal, which comprises the steps of (1) synthesizing intermediate, (2) preparing seed crystal, (3) synthesizing pearl luster pigment crystal. The invention solves the problems of low optical stability and weak flashing property of the prior art pearl luster pigment.

Description

technical field [0001] The invention relates to a synthesis process of pearlescent pigment crystals, more specifically, the invention relates to a synthesis process of basic lead carbonate regular hexagonal crystals as pearlescent pigment crystals; it belongs to the field of fine chemical industry. Background technique [0002] Pearlescent paste or pearlescent coating is a kind of flake coating with high refractive index. It has good gloss and can present a shimmering metallic texture. It is widely used in the coating of cars, furniture, machines, etc. or the surface treatment of resin buttons and handicrafts. Commonly used pearlescent pigments include titanium mica, bismuth oxychloride, lead phosphate and crystalline basic lead carbonate. Among them, the inner core of mica titanium is mica with low optical refractive index, and the outer layer is wrapped with titanium dioxide with high refractive index to form a crystal nucleus, and then one or several layers of other metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/14
Inventor 陈国贵刘艳新
Owner 临海市华宏涂料股份有限公司
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