Process for synthesizing pearlescent pigment crystal

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...

Examples

Embodiment 1

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

[0028] a, the synthesis of intermediates:

[0029] Reaction formula:

[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 at the same time pump in fresh pure water (conductivity ≤ 0.5us / cm) to a sufficient amount, continue stirring for about 5 minutes, turn off the stirring motor, and let it stand. After the feed liquid is clarified, the feed liquid is pumped into the l...

Embodiment 2

[0039] Embodiment 2 (synthesis process of HG type crystal)

[0040] a. Synthesis of intermediates:

[0041] Reaction formula: same as Example 1

[0042] Add a certain amount of high-purity acetic acid (≥99.0%) according to the process ratio requirements, add acetic acid concentration of 2% (weight ratio of acetic acid to the entire reaction solution), about 15 minutes after adding acetic acid, slowly add a certain amount of acetic acid while stirring. The amount of lead oxide (≥99.99%), the concentration of lead ions is 3%, (the weight ratio of lead ions to the entire reaction solution). After the feeding is completed, after stirring and reacting for 25 minutes, put in the metered activated carbon, and at the same time pump in (conductivity≤0.2us / cm) fresh pure water to a sufficient amount, 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 pumped into the lead liquid storage tank thro...

Embodiment 3

[0050] Embodiment 3 (synthesis process of HGV type crystal)

[0051] a. Synthesis of intermediates:

[0052] Reaction formula: same as Example 1

[0053] Add a certain amount of high-purity acetic acid (≥99.0%) according to the process ratio requirements, add acetic acid with a concentration of 1% (weight ratio of acetic acid to the entire reaction solution), about 10 minutes after adding acetic acid, slowly add a certain amount of acetic acid while stirring. The amount of lead oxide (≥99.99%), the concentration of lead ions is 5%, (the weight ratio of lead ions to the entire reaction solution). After the feeding is completed, after stirring and reacting for 30 minutes, put in the metered activated carbon, and at the same time pump in (conductivity ≤ 0.5us / cm) fresh pure water to a sufficient amount, 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 the lead liquid storage...

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...

Examples

Embodiment 1

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

[0028] a, the synthesis of intermediates:

[0029] Reaction formula:

[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 at the same time pump in fresh pure water (conductivity ≤ 0.5us / cm) to a sufficient amount, continue stirring for about 5 minutes, turn off the stirring motor, and let it stand. After the feed liquid is clarified, the feed liquid is pumped into the l...

Embodiment 2

[0039] Embodiment 2 (synthesis process of HG type crystal)

[0040] a. Synthesis of intermediates:

[0041] Reaction formula: same as Example 1

[0042] Add a certain amount of high-purity acetic acid (≥99.0%) according to the process ratio requirements, add acetic acid concentration of 2% (weight ratio of acetic acid to the entire reaction solution), about 15 minutes after adding acetic acid, slowly add a certain amount of acetic acid while stirring. The amount of lead oxide (≥99.99%), the concentration of lead ions is 3%, (the weight ratio of lead ions to the entire reaction solution). After the feeding is completed, after stirring and reacting for 25 minutes, put in the metered activated carbon, and at the same time pump in (conductivity≤0.2us / cm) fresh pure water to a sufficient amount, 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 pumped into the lead liquid storage tank thro...

Embodiment 3

[0050] Embodiment 3 (synthesis process of HGV type crystal)

[0051] a. Synthesis of intermediates:

[0052] Reaction formula: same as Example 1

[0053] Add a certain amount of high-purity acetic acid (≥99.0%) according to the process ratio requirements, add acetic acid with a concentration of 1% (weight ratio of acetic acid to the entire reaction solution), about 10 minutes after adding acetic acid, slowly add a certain amount of acetic acid while stirring. The amount of lead oxide (≥99.99%), the concentration of lead ions is 5%, (the weight ratio of lead ions to the entire reaction solution). After the feeding is completed, after stirring and reacting for 30 minutes, put in the metered activated carbon, and at the same time pump in (conductivity ≤ 0.5us / cm) fresh pure water to a sufficient amount, 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 the lead liquid storage...