Preparation method of coating-modified aluminumpigment

An aluminum pigment and modification technology, which is applied in the field of pigments to achieve the effects of easy realization, good acid and alkali corrosion resistance and oxygen oxidation resistance, and improved application performance.

Inactive Publication Date: 2015-04-01
常熟市环虹化工颜料厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to provide a method for preparing coated modified aluminum

Method used

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Examples

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preparation example Construction

[0022] The invention discloses a method for preparing a coated modified aluminum pigment, comprising the following steps:

[0023] (1) Raw material preparation: add aluminum pigment into absolute ethanol solution, stir to form a suspension with a solid-to-liquid ratio of 1 / 20-25, and set aside; mix styrene, butyl acrylate, methacrylic acid and 2,2′- Dissolve azobisisobutyronitrile in deionized water at a mass ratio of 2:1:0.5:0.005, stir to form a mixed monomer solution with a mass concentration of 0.3-0.5g / L, and set aside;

[0024] (2) One-stage polymerization reaction: Add the mixed monomer solution prepared in step (1) into the suspension under stirring, heat up to 40-50°C while stirring, and then add a certain amount of 2-3 : The mixture of magnesium hydroxide and tricalcium phosphate mixed with a mass ratio of 1 is used as a dispersant. After stirring at a high speed of 10000-12000r / min at a constant temperature for 30-40min, ultrasonically disperse for 1-2h to form a un...

Embodiment 1

[0028] Add 5g of aluminum pigment into 100ml of absolute ethanol solution, stir to form a suspension, and set aside; take 20g of styrene, 10g of butyl acrylate, 5g of methacrylic acid and 0.05g of 2,2'-azobisisobutyronitrile and dissolve it in 120ml of deionized In water, stir to form a mixed monomer solution, set aside;

[0029] Add the above mixed monomer solution into the suspension under stirring, heat up to 40°C while stirring, and then add 5.6g of a mixture of magnesium hydroxide and tricalcium phosphate mixed at a mass ratio of 2:1. After stirring at a high speed of 10000r / min for 40min, ultrasonically disperse for 1h to form a pre-polymer with uniform texture; then place the pre-polymer in a nitrogen-protected polymerization reactor at a stirring rate of 290r / min at 95°C The polymerized product is obtained by aging for 3 hours under constant temperature conditions; the polymerized product is filtered, vacuumed, washed with absolute ethanol for 5 to 8 times, and dried a...

Embodiment 2

[0031] Take 5g of aluminum pigment and add it to 125ml of absolute ethanol solution, stir to form a suspension, and set aside; take 20g of styrene, 10g of butyl acrylate, 5g of methacrylic acid and 0.05g of 2,2'-azobisisobutyronitrile and dissolve it in 100ml of deionized In water, stir to form a mixed monomer solution, set aside;

[0032] Add the above-mentioned mixed monomer solution into the suspension under stirring, heat up to 50°C while stirring, then add 7g of a mixture of magnesium hydroxide and tricalcium phosphate mixed in a mass ratio of 3:1 and set the temperature at 12000rr After stirring at a high speed of 30 min at a rate of 30 min, ultrasonically disperse for 2 h to form a pre-polymer with uniform texture; Aging at a constant temperature for 2 hours to obtain a polymer product; the polymer product is filtered, vacuumed, washed with absolute ethanol for 5 to 8 times, and dried at room temperature to obtain the coated modified aluminum pigment.

[0033] The thic...

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Abstract

The invention discloses a preparation method of a coating-modifiedaluminum pigment. The preparation method comprises the following steps: (1), raw material preparation; (2), primary polymerization reaction; (3), secondary polymerization reaction; and (4), product separation. The prepared aluminum pigment can exist stably in solutions with pH of 1 and 11 for longer than 90 days, and can exist stably inan oxygen environment for longer than 1 year. The preparation method of the coating-modifiedaluminum pigment has the followingadvantages: (1), the operation is simple, convenient and easy to implement, and particle size controllability is realized; (2), the aluminum pigment surface is coated with an inert and transparent protecting shell, so that not only can the aluminum pigment be effectively prevented from being oxidized by an acid-alkali solutionor oxygen in air, but also the color of the aluminum pigment is not influenced; (3), the coating shell is compact and uniform, the shell layer is thinner, and the acid and alkali resistance and oxygen oxidation resistance are good; and (4), the particle size of the aluminum pigment after coating modification is smaller and has narrow distribution range, and accordingly, the dispersibility and the application performance of the aluminum pigment are improved.

Description

technical field [0001] The invention relates to the field of pigments, in particular to a method for preparing coated modified aluminum powder pigments. Background technique [0002] Metallic aluminum pigment is an important functional powder material, which is mainly used in coatings, paints, inks, printing and other industries. Aluminum is an amphoteric active metal. It is very easy to oxidize and turn black when exposed to acid and alkali solutions or Q in the air, which affects its metallic luster and produces a large amount of H 2 , affecting its storage stability, and may even cause an explosion, making storage more dangerous. Therefore, surface modification of metallic aluminum pigments is a necessary measure to improve their application performance. [0003] Traditional methods to prevent the surface of aluminum powder from being oxidized include phosphating, corrosion inhibitor adsorption modification, and sol-gel method for silica coating modification. Among them...

Claims

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Application Information

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IPC IPC(8): C09C1/64C09C3/10C08F212/08C08F220/18C08F220/06
Inventor 范建平
Owner 常熟市环虹化工颜料厂
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