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A kind of preparation method and water-based aluminum pigment of organosilicon-coated water-based aluminum pigment

A technology of organosilicon and aluminum pigments, applied in the field of water-based aluminum pigments, can solve the problems of aluminum powder gloss reduction, long operation process, harsh conditions, etc., and achieve the effect of dense coating layer, improved corrosion resistance, and easy realization

Active Publication Date: 2020-06-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have a long operation process, harsh conditions, a serious decrease in the gloss of the aluminum powder, and are difficult to industrialize because of their high cost.

Method used

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  • A kind of preparation method and water-based aluminum pigment of organosilicon-coated water-based aluminum pigment
  • A kind of preparation method and water-based aluminum pigment of organosilicon-coated water-based aluminum pigment
  • A kind of preparation method and water-based aluminum pigment of organosilicon-coated water-based aluminum pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A preparation method of an organosilicon-coated water-based aluminum pigment, the steps are as follows:

[0062] (1) Washing of the surface of aluminum powder: disperse 100g of aluminum powder into 500ml of phosphoric alcohol detergent with a concentration of 5%, stir and wash at a high speed at 25°C for 60min; then wash with acetone solvent to further clean the surface of aluminum powder The fatty acid layer and the acidic detergent left on the surface of the aluminum powder.

[0063] (2) Surface hydroxylation treatment of aluminum powder: Add 100g of aluminum powder washed in step (1) and 500ml of ethanol into the reaction vessel for mixing and stirring to disperse; then, add 2.24g of triethanolamine to treat the surface hydroxyl of aluminum powder at 60°C chemical treatment; after 20 min of treatment, the mixture was filtered and washed with acetone solvent.

[0064] (3) Organosilicon-coated aluminum powder: Mix and stir 100g of aluminum powder, 50ml of acetone, and...

Embodiment 2

[0067] A preparation method of an organosilicon-coated water-based aluminum pigment, the steps are as follows:

[0068] (1) Washing of the surface of aluminum powder: disperse 100g of aluminum powder into 500ml of 5% boric acid alcohol detergent, stir and wash at a high speed at 60°C for 10min; then wash with tetrahydrofuran solvent to further clean the hydrophobic surface of aluminum powder Acidic detergent remaining on the surface of fatty acid layer and aluminum powder.

[0069] (2) Hydroxylation treatment on the surface of aluminum powder: Add 100g of aluminum powder washed in step (1) and 500ml of ethanol into the reaction vessel for mixing and stirring to disperse; then, add 1.7g of ammonia water to hydroxylate the surface of aluminum powder at 40°C Treatment; after 40 minutes of treatment, the mixture was filtered and washed with tetrahydrofuran solvent.

[0070] (3) Organosilicon-coated aluminum powder: 100g of aluminum powder, 50ml of tetrahydrofuran, and 2g of dibut...

Embodiment 3

[0073] A preparation method of an organosilicon-coated water-based aluminum pigment, the steps are as follows:

[0074] (1) Washing of the surface of aluminum powder: disperse 100g of aluminum powder into 500ml of phosphoric alcohol detergent with a concentration of 5%, stir and wash at 45°C for 30min at high speed; then wash with acetone solvent to further clean the surface of aluminum powder The fatty acid layer and the acidic detergent left on the surface of the aluminum powder.

[0075] (2) Aluminum powder surface hydroxylation treatment: the 100g aluminum powder washed in step (1) and 500ml ethanol are added in the reaction vessel to mix and stir to disperse; subsequently, add the mixed solution of 4.27g hydrogen peroxide and sodium carbonate (two The mass ratio of the aluminum powder is 1:5) at 25°C to carry out hydroxylation treatment on the surface of the aluminum powder; after 60 minutes of treatment, the mixed solution is filtered and washed with acetone solvent.

...

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Abstract

The invention discloses a preparation method of an organosilicon-coated aqueous aluminum pigment, and an aluminum pigment. The preparation method comprises: (1) washing of the surface of aluminum powder; (2) surface hydroxylation treatment of the aluminum powder: mixing the washed aluminum powder and an organic solvent 2, adding a treatment liquid, and carrying out surface hydroxylation on the aluminum powder; and (3) coating the aluminum powder with organosilicon: mixing the hydroxylated aluminum powder, an organic solvent 3 and a catalyst, adding the mixed liquid into a polysiloxane solutioncontaining an active reactive group in a dropwise manner, carrying out a reaction, filtering, washing, and drying to obtain the coated aluminum powder. According to the present invention, the reactive organosiloxane is used, and is subjected to grafting and condensation cross-linking at the surface of the aluminum powder so as to achieve the microencapsulation of the aluminum powder; the preparedaluminum pigment has characteristics of good water resistance, corrosion resistance and high gloss, and has good compatibility with aqueous coating material emulsions; and the method has advantages of simple reaction, low cost, industrial prospects and environmental protection.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a method for preparing an organosilicon-coated water-based aluminum pigment and the water-based aluminum pigment. Background technique [0002] In order to meet people's ever-increasing requirements for environmental protection and living conditions, as well as the newly promulgated regulations on the emission of VOCs (Huanban Daqihan [2017] No. 565 "Emission Standards for Air Pollutants in Coatings, Inks and Adhesives Industry") It is imperative to replace solvent-based coatings with water-based coatings. [0003] Aluminum pigment is a substance that provides the metallic luster of the paint. Its main component is micron-sized flake aluminum powder. When the water-based resin is used as the base material of the paint, the aluminum pigment originally used in the solvent-based paint will react with water in the water-based paint. The reaction produces hydrogen gas, which becomes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/64C09C3/06C09C3/08C09C3/12C09D5/10
CPCC01P2006/90C09C1/64C09C1/648C09C3/006C09C3/06C09C3/08C09C3/12C09D5/103
Inventor 史翎张传敏李雯琪
Owner BEIJING UNIV OF CHEM TECH