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Preparation method of high-brilliance iron oxide coated pigment

A technology of iron oxide and pigments, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems such as insufficient red phase, concerns about the influence of organic matter, dark color, etc.

Inactive Publication Date: 2017-11-07
林一中
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In short, the color of the pigment or filler obtained by coating iron oxide according to the existing method is dark and the red phase is insufficient, especially when the fine-grained substrate product is used as a filler.
In many cosmetic formulations, such as lipstick, it is desired to obtain a bright red effect, but ordinary iron oxide pigments cannot obtain convenient and satisfactory dispersion effects, and have to use organic red pigments, but this will cause people to be concerned about the impact of organic matter on people. to worry about

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In the open reactor, add 60 g spherical silica with an average particle size of 3 μm, add 600 mL of water according to the solid-liquid weight ratio of 1 / 10 to prepare a slurry, heat and stir to 78 ° C, and use sodium hydroxide solution to make the system The pH was adjusted to 8.5, and then 200 mL of 1M ferrous sulfate aqueous solution was added under the condition that sodium hydroxide was used to neutralize and maintain the pH of the system. The addition rate was 20 mL / h, and the addition was completed in about 10 hours. After the addition, the pH of the system was adjusted with hydrochloric acid. The pH was adjusted to 3, and then 250 mL of 1M ferrous sulfate aqueous solution was added under the condition that sodium hydroxide was used to neutralize the pH of the system. After completion, filter, wash, and dry at 100°C to obtain yellow powder, which is calcined at 600°C for 10 min to obtain brilliant red iron oxide-coated spherical silica. Scratch card detection a=2...

Embodiment 2

[0064] In the open reactor, add 60 g spherical silica with an average particle size of 3 μm, add 1000 mL of water and 200 ethanol according to the solid-liquid weight ratio of 1 / 20, heat and stir to 70 ° C, and use potassium hydroxide solution to adjust the pH of the system. Adjust to 8.0, and then add 50 mL of 2M ferrous sulfate aqueous solution under the condition that potassium hydroxide is used to neutralize and maintain the pH of the system, and the feeding rate is 10 mL / h. After the addition is completed for about 5 hours, the stirring is continued for 1 hour; after the addition is completed The pH value of the system was adjusted to pH 2.8 with sulfuric acid, and then 350 mL of 1M ferrous sulfate aqueous solution was added under the condition that potassium hydroxide was used to neutralize the pH of the system to maintain a stable pH. The reaction temperature was maintained at 70 °C, and the addition rate was 35 mL / h. After 10 hours of addition; after the addition of mat...

Embodiment 3

[0066] In the open reactor, add 60 g of synthetic mica with an average particle size of 5 μm, add 480 mL of water according to the solid-liquid weight ratio of 1 / 8 to prepare a slurry, heat and stir to 85 ° C, and adjust the pH of the system to 9.0 with sodium hydroxide , and then add 200 mL of 2M ferrous sulfate aqueous solution at 85 °C under the condition that sodium hydroxide is used to neutralize the pH of the system, the feeding rate is 10 mL / h, and the addition is completed in about 20 h; after the feeding is completed, 5 mL of 30% hydrogen peroxide is added for 0.5 h. After adding, continue stirring for 0.5h; then use a solution containing 1M ferrous sulfate and 1M sulfuric acid to adjust the pH to 2.5 within 2h, and then use potassium hydroxide to neutralize at 85°C to maintain pH stability. Add 50 mL of 1M ferrous sulfate aqueous solution, the feeding rate is 20 mL / h, and the addition is completed in about 2.5 h; after the feeding is completed, filter, wash, and dry a...

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Abstract

The invention relates to a preparation method of a pigment coated with high-brightness iron oxide, which comprises the steps of: (1) dispersing the base material in water or mixing water and alcohol according to the solid-liquid weight ratio of 1 / 4-1 / 20 solution, control the system temperature at 0-120°C, adjust the system pH to 5-13, and control the pH at this pH value, add Fe(II) salt solution under stirring conditions; (2) control the system temperature at 0-120°C , adjust the pH value of the system to be 1-5, and control it at this pH value, add Fe(II) salt solution under stirring, and its charging amount (calculated as Fe2O3) is 0.01-200% of the substrate weight; (3) filter, washing, drying at 80-120°C, and further calcining at 300-900°C to obtain a bright red iron oxide-coated pigment, wherein steps (1) and (2) are carried out in the presence of an oxidizing agent. The iron oxide-coated pigment prepared by the method of the invention has high brilliance, can be applied to cosmetics such as lipstick, and has the advantages of non-toxicity and no volatile matter.

Description

technical field [0001] The invention relates to a preparation method of a pigment, in particular to a preparation method of a high-brilliance iron oxide-coated pigment. Background technique [0002] Iron oxide is the second largest inorganic pigment after titanium dioxide, and also the largest color inorganic pigment. Iron oxide red is a very important class of iron oxide pigments, which has a very wide range of uses, and is widely used in various fields such as ink, plastics, coatings, rubber, ceramics, building materials, and papermaking. Iron oxide red, also known as iron red or iron oxide red, is a traditional and important inorganic pigment, and its chemical formula is α-Fe 2 o 3 , is red or deep red powder, due to different preparation methods, the particle size and shape are also different, iron red has different hues. When iron oxide red is used alone, it will be agglomerated and difficult to disperse, which will cause the color of iron oxide to become dark when u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/24C09C3/00C09C3/08
CPCC09C1/24C09C3/006C09C3/08
Inventor 林一中王振兴
Owner 林一中
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