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Preparation method of hydrophobic oleophilic cochineal red pearlescent pigment

A cochineal, hydrophobic and lipophilic technology, applied in inorganic pigment treatment, chemical instruments and methods, fibrous fillers, etc., can solve problems such as difficult dispersion, unevenness, agglomeration and coloring, and achieve the effect of expanding application fields

Inactive Publication Date: 2018-12-18
杭州弗沃德精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This characteristic will make the pearlescent pigments coated with carmine on the surface difficult to disperse in oily solvents, and prone to agglomeration and uneven coloring

Method used

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  • Preparation method of hydrophobic oleophilic cochineal red pearlescent pigment

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Effect test

Embodiment 1

[0025] A method for preparing a hydrophobic and lipophilic cochineal pearlescent pigment, using cochineal pigment and mica powder with a particle size of 10-100um as raw materials, the preparation process comprising the following steps:

[0026] Step 1: Preparation of oil-soluble cochineal pigment, adding 1 g of cochineal pigment into a mixed solution of 15 ml of acetic anhydride and 35 ml of acetic acid and stirring evenly, then adding 2 ml of triethylamine catalyst, stirring under reflux at 60° C., and reacting for 6 hours.

[0027] Step 2: Purification of oil-soluble cochineal red pigment. After the reaction, the mixed solution was cooled to room temperature, 100ml of distilled water was added, stirred for 1 hour, and then the mixed solution was distilled under reduced pressure to collect the solid product, dried in an oven at 80°C to constant weight, and the obtained product That is, oil-soluble cochineal red pigment;

[0028] Step 3: Pretreatment of mica powder, add 10g o...

Embodiment 2

[0031] A method for preparing a hydrophobic and lipophilic cochineal pearlescent pigment, using cochineal pigment and mica powder with a particle size of 10-100um as raw materials, the preparation process comprising the following steps:

[0032] Step 1: Preparation of oil-soluble cochineal pigment, adding 1g carmine to a mixed solution of 20ml acetic anhydride and 30ml acetic acid and stirring evenly, then adding 2ml triethylamine catalyst, stirring under reflux at 70°C, and reacting for 8h.

[0033] Step 2: Purification of oil-soluble carminic acid. After the reaction, cool the mixed solution to room temperature, add 100ml of distilled water, stir for 2 hours, then distill the mixed solution under reduced pressure, collect the solid product, and dry it in an oven at 80°C to constant weight. The obtained product is oil Soluble carmine;

[0034] Step 3: Pretreatment of mica powder, add 10g of mica powder to 90g of distilled water to prepare a slurry, then add 0.1g of silane cou...

Embodiment 3

[0037] A method for preparing a hydrophobic and lipophilic cochineal pearlescent pigment, using cochineal pigment and mica powder with a particle size of 10-100um as raw materials, the preparation process comprising the following steps:

[0038] Step 1: Preparation of oil-soluble cochineal pigment, adding 1g carmine to a mixed solution of 25ml acetic anhydride and 30ml acetic acid and stirring evenly, then adding 3ml triethylamine catalyst, stirring under reflux at 80°C, and reacting for 8 hours.

[0039] Step 2: Purification of oil-soluble cochineal red pigment. After the reaction, the mixed solution was cooled to room temperature, 100ml of distilled water was added, stirred for 2 hours, and then the mixed solution was distilled under reduced pressure, and the solid product was collected, dried in an oven at 80°C to constant weight, and the obtained product That is, oil-soluble cochineal red pigment;

[0040] Step 3: Pretreatment of mica powder, add 10g of mica powder to 90g ...

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Abstract

The invention provides a preparation method of a hydrophobic oleophilic cochineal red pearlescent pigment. The method is characterized in that a hydroxy group in carmine acid molecule is esterified toprepare an oil-soluble cochineal red pigment, a mica substrate is treated with an oil-soluble cochineal red pigment colored silane coupling agent, and the novel pearlescent pigment is prepared. Compared with the prior art, the hydrophobic and lipophilic surface of the pearlescent pigment is more easily wetted by an oily solvent, dispersion of the pearlescent pigment in the environments of oily coatings, oily inks, oily cosmetics and the like can be improved, and the application fields of the pigment are greatly expanded.

Description

technical field [0001] The invention relates to a method for preparing a hydrophobic and lipophilic carmine pearlescent pigment, belonging to the field of mica pearlescent pigments. Background technique [0002] Mica pearlescent pigment is based on mica powder, coated with high refractive index material on the surface, through the interference or reflection of light to produce dazzling pearl luster, with gorgeous decorative effect, suitable for coatings, inks, plastics, cosmetics and other fields of coloring. [0003] Cochineal red pigment is derived from the dry body of cochineal female adults, and its main component is carminic acid, which is a commonly used high-quality natural dye. It has excellent coloring performance and strong free radical scavenging ability, and is widely used in food, pharmaceutical and other industries. [0004] Patent CN 103421244A discloses a preparation process of carmine pigment with illusion effect. The surface of the transparent substrate i...

Claims

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Application Information

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IPC IPC(8): C09C1/40C09C3/12C09C3/08C09B1/06
CPCC09B1/06C09C1/0015C09C3/006C09C3/08C09C3/12
Inventor 周亚军蒋汉文
Owner 杭州弗沃德精细化工有限公司
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