Chromium-free low-temperature curing water-based zinc-aluminum coating as well as preparation method and application thereof

A zinc-aluminum coating, water-based technology, applied in anti-corrosion coatings, fire-resistant coatings, coatings, etc., can solve problems such as cracking, high energy consumption, and loss of protective performance

Active Publication Date: 2022-03-15
BOMEX CHEM SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent application CN 1172135A pointed out that the traditional chrome-free water-based zinc-aluminum coating needs to be cured at 320-360°C for 30 minutes, and the coating disclosed in CN 1172135A requires The curing and baking temperature is 355°C, the energy consumption is very high, and the coating performance is not damaged, and the service life is only 300°C / 1h; in addition, there are also chromium-free water-based zinc-aluminum low-temperature, self-drying coatings, such as Chinese patent application CN 106893485A And the coating disclosed in CN 111040556A, although the curing temperature of the coating is low, the coating obtained after curing will be pulverized and cracked after being applied in a high temperature environment, and the protective performance will disappear completely, so it is not suitable for the use conditions of automobile brake discs.

Method used

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  • Chromium-free low-temperature curing water-based zinc-aluminum coating as well as preparation method and application thereof
  • Chromium-free low-temperature curing water-based zinc-aluminum coating as well as preparation method and application thereof
  • Chromium-free low-temperature curing water-based zinc-aluminum coating as well as preparation method and application thereof

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preparation example Construction

[0050] The present invention also provides a preparation method for the chrome-free low-temperature curing water-based zinc-aluminum coating described in the above technical solution, comprising the following steps:

[0051] mixing the first co-solvent and thickener, and mixing the obtained first mixture, dispersant, defoamer and zinc-aluminum antirust powder to obtain the zinc-aluminum paste;

[0052] Mixing water, a second co-solvent and a passivator to obtain a second mixture;

[0053] Mixing the water-soluble silicone resin and the curing accelerator to obtain a third compound;

[0054] The second mixture and the third mixture are mixed to perform a hydrolysis reaction, and the obtained hydrolyzed material solution is mixed with an aqueous nano inorganic silicate to perform a hybridization reaction to obtain the aqueous silicon slurry.

[0055] In the present invention, each component in the preparation method is consistent with each component in the chromium-free low-tem...

Embodiment 1

[0092] Carry out the preparation of chromium-free low-temperature curing water-based zinc-aluminum coating according to the substance consumption in Table 1:

[0093] Mix the first co-solvent and thickener at 25°C, and mix the obtained first mixture, dispersant, defoamer and zinc-aluminum antirust powder at 30°C to obtain the zinc-aluminum paste;

[0094] Mixing water, a second co-solvent and a passivating agent at 25°C to obtain a second mixture;

[0095] Mixing the water-soluble silicone resin and the curing accelerator to obtain a third compound;

[0096] Mix the second mixture with the third mixture, stir at room temperature for 3.5 hours to carry out a hydrolysis reaction, mix the obtained hydrolyzed feed solution with aqueous nano-inorganic silicate, and stir at room temperature for 1.5 hours to carry out a hybridization reaction to obtain the Water-based silicon paste;

[0097] The obtained zinc-aluminum paste and water-based silicon paste are mixed according to a mas...

Embodiment 2

[0109] Carry out the preparation of chromium-free low-temperature curing water-based zinc-aluminum coating according to the substance consumption of table 3:

[0110] Mix the first co-solvent and thickener at 25°C, and mix the obtained first mixture, dispersant, defoamer and zinc-aluminum antirust powder at 30°C to obtain the zinc-aluminum paste;

[0111] Mixing water, a second co-solvent and a passivating agent at 25°C to obtain a second mixture;

[0112] Mixing the water-soluble silicone resin and the curing accelerator to obtain a third compound;

[0113] Mix the second mixture with the third mixture, stir at room temperature for 3 hours to carry out hydrolysis reaction, mix the obtained hydrolyzed feed solution with aqueous nano-inorganic silicate, stir at room temperature for 1 hour to carry out hybridization reaction, and obtain the water-based silicon pulp;

[0114] The obtained zinc-aluminum paste and water-based silicon paste are mixed according to a mass ratio of 6...

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Abstract

The invention belongs to the technical field of zinc-aluminum coatings, and particularly relates to a chromium-free low-temperature curing water-based zinc-aluminum coating as well as a preparation method and application thereof. The invention provides a chromium-free low-temperature curing water-based zinc-aluminum coating. The chromium-free low-temperature curing water-based zinc-aluminum coating comprises zinc-aluminum slurry and water-based silicon slurry which are independently subpackaged, the zinc-aluminum paste comprises the following components: zinc-aluminum antirust powder, a dispersing agent, a first cosolvent, a defoaming agent and a thickening agent; the water-based silicon slurry comprises the following components: water-soluble organic silicon resin, water-based nano inorganic silicate, a curing accelerator, a passivator, a second cosolvent and water. The chromium-free low-temperature curing water-based zinc-aluminum coating provided by the invention has the characteristics of low curing temperature and long high-temperature service life.

Description

technical field [0001] The invention belongs to the technical field of zinc-aluminum coatings, and in particular relates to a chrome-free low-temperature curing water-based zinc-aluminum coating and a preparation method and application thereof. Background technique [0002] The brake disc is an extremely important part of the car braking system, which is directly related to the safety of car users; the chrome-free water-based zinc-aluminum coating is environmentally friendly and has excellent salt spray resistance, and is widely used in the protective coating of car brake discs. Applications. [0003] Chinese patent application CN 1172135A pointed out that the traditional chrome-free water-based zinc-aluminum coating needs to be cured at 320-360°C for 30 minutes. The undamaged life of the coating is only 300°C / 1h; in addition, there are chromium-free water-based zinc-aluminum low-temperature, self-drying coatings, such as the coatings disclosed in Chinese patent application...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D5/10C09D7/61
CPCC09D183/04C09D5/106C09D7/61C09D5/18C08K3/34C08K3/08C08K7/00Y02E10/50
Inventor 林银丹
Owner BOMEX CHEM SHANGHAI
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