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Preparation method of hydrophilic pigment

A hydrophilic and pigment technology, applied in the field of pigments, can solve the problems of easy agglomeration and fast sedimentation, and achieve the effect of improving dispersion stability, increasing potential, and solving poor dispersion stability.

Active Publication Date: 2022-05-06
SHANGHAI CHUANGYUAN COSMETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the existing problems, the present invention provides a preparation method for modifying the surface of the pigment in two steps using a silane coupling agent and a modified coating agent as raw materials. The obtained hydrophilic pigment has a hydrophilic The stability and dispersion stability in the water system are significantly improved, which solves the problems of fast sedimentation and easy agglomeration of pigments in the water system

Method used

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  • Preparation method of hydrophilic pigment
  • Preparation method of hydrophilic pigment
  • Preparation method of hydrophilic pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The present embodiment is to pigment TiO 2 Make modifications. as attached figure 1 Shown, is the hydrophilic pigment TiO 2 The preparation process flow chart specifically comprises the following steps:

[0050] S0: material preparation.

[0051] S1: the first dispersion; 5g TiO 2 and 30mL of absolute ethanol were stirred evenly to obtain TiO 2 Solid-liquid mixture I.

[0052] S2: The first step reaction; hydrolyze 0.5g 3-aminopropyltriethoxysilane (KH550) in 5mL 80% ethanol solution for 5min, then add the above TiO 2 In the solid-liquid mixture I, stir, condense and reflux for 4h.

[0053] S3: drying for the first time; centrifugation, washing, drying to a constant weight, and pulverization to obtain dry powder I.

[0054] S4: Second dispersion; mix 1.5g PSI with the above dry powder I and add to 100mL water and stir evenly to obtain TiO 2 Solid-Liquid Mixture II.

[0055] S5: The second step reaction; add 1.5g NaOH to the above TiO 2 In the solid-liquid mixtu...

Embodiment 2

[0064] This embodiment continues to pigment TiO 2 Make modifications. Specifically, take 5g TiO 2 , and the TiO 2 and 3-aminopropyltriethoxysilane mass ratio adjusted to 1:0.02, TiO 2 The mass ratio to PSI is adjusted to 1:0.1, and the preparation process and other conditions are the same as in Example 1.

Embodiment 3

[0066] In this embodiment, iron oxide yellow is modified. Specifically include the following steps:

[0067] S0: material preparation.

[0068] S1: Disperse for the first time; stir 5 g of iron oxide yellow and 30 mL of absolute ethanol evenly to obtain iron oxide yellow solid-liquid mixture I.

[0069] S2: The first step reaction: hydrolyze 0.75g of 3-aminopropyltriethoxysilane in 5mL of 80% ethanol solution for 5min, then add it to the above iron oxide yellow solid-liquid mixture I, stir, condense and reflux for 4h.

[0070] S3: drying for the first time; centrifugation, washing, drying to a constant weight, and pulverization to obtain dry powder I.

[0071] S4: second dispersion; mix 2.0g of PSI with the above dry powder I, add to 100mL of water and stir evenly to obtain yellow iron oxide solid-liquid mixture II.

[0072] S5: The second step reaction; add 1.5g NaOH to the above iron oxide yellow solid-liquid mixture II, and stir for 3h.

[0073] S6: adjust the pH; adjus...

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Abstract

The invention provides a preparation method of a hydrophilic pigment, which takes a silane coupling agent and a modified coating agent as modification raw materials, optimizes the steps of dispersion, reaction, drying, pH regulation and the like, and performs surface modification on the pigment in two stages: step 1, grafting the silane coupling agent on the surface of the pigment; in the second step, the modified coating agent is grafted on the surface of the pigment through the reaction between the modified coating agent and the silane coupling agent, the mass ratio of the silane coupling agent to the pigment and the mass ratio of the modified coating agent to the pigment are further optimized, the surface potential of the pigment is improved, and therefore the dispersion stability of the pigment in water is improved; the problems of poor dispersion stability, easy agglomeration and the like of the pigment in a water system are solved.

Description

technical field [0001] The invention relates to the technical field of pigments, in particular to a method for preparing hydrophilic pigments. Background technique [0002] Pigments are widely used in cosmetics, especially in make-up and sunscreen cosmetics. Pigment is the main part of coloring in cosmetic formulations. The degree of dispersion of pigment particles seriously affects the application performance of pigments such as color, hiding power, tinting power, oil absorption, etc., and has an important impact on product quality and stability. Therefore, improving the dispersibility of pigments is one of the main areas of powder engineering technology research in recent years, and it is also an important technical problem that needs to be solved in the development of color cosmetics and sunscreen products. In cosmetics, commonly used pigments include inorganic pigments and organic pigments, among which inorganic pigments are mainly metal oxides and metal complexes, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C1/24C09C3/12C09C3/10
CPCC09C1/3684C09C1/3676C09C1/363C09C1/3692C09C1/24C09C3/12C09C3/10C09C3/043C09C3/006C01P2006/22
Inventor 曾四立王伟张云飞
Owner SHANGHAI CHUANGYUAN COSMETICS
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