Water-based aluminum silver paste and preparation method thereof

An aluminum-silver paste, water-based technology, used in pigment paste, dyeing organosilicon compound treatment, fibrous fillers, etc. effect reduction and other problems, to achieve the effect of maintaining metallic luster, reducing light reflection, and improving transparency

Active Publication Date: 2015-04-29
长沙族兴新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method is coated with a single substance, and the required amount of tetraethyl orthosilicate is relatively large, and the gloss effect of the aluminum sheet after coating is significantly reduced. Therefore, the obtained water-based aluminum paste has poor whiteness, brightness, and poor hiding power; There are a lot of hydroxyl groups on the silicon surface, which makes the water-based silver-aluminum paste hydrophilic and oleophobic. In water-based paints, the silica-coated water-based aluminum paste has poor compatibility with resins, resulting in poor film stability.

Method used

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  • Water-based aluminum silver paste and preparation method thereof

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[0022] The embodiment of the present invention discloses a preparation method of water-based aluminum-silver paste, comprising the following steps:

[0023] a) Mix oily aluminum silver paste, organic solvent, silane coupling agent and water, and separate the solid mixture from the solvent after the silane coupling agent is hydrolyzed;

[0024] b) mixing the solid mixture, water and an organic solvent, and adjusting the pH to 7-8 to obtain a mixed solution;

[0025] c) mixing the mixed liquid, silane coupling agent and ethyl orthosilicate, and aging after reaction to obtain water-based aluminum silver paste.

[0026] The invention provides a preparation method of water-based aluminum-silver paste. In the process of preparing the water-based aluminum-silver paste, the present invention first uses a silane coupling agent to pretreat the oily aluminum-silver paste. The silane coupling agent is hydrolyzed to generate SiOH, and Si-OH is dehydrated and condensed to generate Si-OH-co...

Embodiment 1

[0039] (1) In the dispersion tank, disperse 100kg of oily aluminum silver paste in 250kg of isopropanol solvent, add 10kg of methyltrimethoxysilane, 6kg of water, after fully dispersed, separate solid and liquid to obtain filter cake and solution.

[0040] (2) Put the filter cake in the reaction kettle, add 300kg of isopropanol solvent, 8kg of water, keep the temperature at 40°C, fully disperse, and adjust the pH value of the solution to between 7 and 8 with ammonia water;

[0041] (3) Add 5kg of 3-aminopropyltrimethoxysilane and 3kg of ethyl orthosilicate dropwise.

[0042] The interval is 4h;

[0043] (4) Aging for 4 hours after the reaction, cooling, sieving, and pressure filtration to obtain water-based aluminum-silver paste;

[0044] (5) Adjust the solid content of the water-based aluminum-silver paste to 60wt%.

[0045] Mix 1 part by weight of oily aluminum-silver paste before coating and 1 part by weight of water-based aluminum-silver paste after coating with 1 part b...

Embodiment 2

[0049] (1) In the dispersion tank, disperse 100kg of oily aluminum silver paste in 250kg of ethanol solvent, add 10kg of methyltrimethoxysilane, 6kg of water, after fully dispersed, separate the solid and liquid to obtain the filter cake and solution;

[0050] (2) Put the filter cake in the reaction kettle, add 300kg of isopropanol solvent, 8kg of water, keep the temperature at 40°C, fully disperse, and adjust the pH value of the solution to between 7 and 8 with ammonia water;

[0051] (3) Add 5kg of 3-aminopropyltrimethoxysilane and 3kg of ethyl orthosilicate dropwise for 6 hours;

[0052] (4) Aging for 4 hours after the reaction, cooling, sieving, and pressure filtration to obtain water-based aluminum-silver paste;

[0053] (5) Adjust the solid content of the water-based aluminum-silver paste to 60wt%.

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Abstract

The invention provides a water-based aluminum silver paste and a preparation method thereof. The preparation method for the water-based aluminum silver paste comprises the following steps: a) mixing an oily aluminum silver paste, an organic solvent and a silane coupling agent with water, and separating a solid mixture from the solvent; b) mixing the solid mixture and water with the organic solvent and adjusting pH to 7-8, thereby obtaining a mixed liquor; and c) mixing the mixed liquor and the silane coupling agent with ethyl orthosilicate, and aging after reacting, thereby obtaining the water-based aluminum silver paste. According to the preparation method, during the process of preparing the water-based aluminum silver paste, firstly, the silane coupling agent is utilized to preprocess the oily aluminum silver paste, so as to form covalent bond connection on the surface of the oily aluminum silver paste, and then the silane coupling agent and the ethyl orthosilicate are dropwise added, so as to form coverage on the surface of the aluminum silver paste by the silicon dioxide hydrolysed from the ethyl orthosilicate, and lastly, the prepared aluminum silver paste has high brightness, high covering power and better compatibility with resins.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based aluminum-silver paste and a preparation method thereof. Background technique [0002] Aluminum silver paste is a kind of aluminum metal pigment. Its production method is to mix spherical aluminum powder, solvent oil, oleic acid and ball milling medium steel balls, and then grade and sieve after ball milling for 6-30 hours. It is a paste metal pigment obtained after kneading. . Aluminum silver paste has become the most widely used and researched metallic pigment due to its unique metallic luster effect, angle-dependent color effect, optical effect and suspension characteristics. [0003] With the development of water-based coatings, the traditional oily aluminum silver paste is not easy to disperse in water-based coatings due to the presence of a large amount of solvent oil, making it unsuitable for water-based coatings; and aluminum is an amphoteric metal. The pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/64C09C3/12C09D17/00
Inventor 邵成先夏风曾孟金
Owner 长沙族兴新材料股份有限公司
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