Composite zinc coating sealing agent with excellent scratch resistance and preparation method thereof

Abstract

The invention discloses a composite zinc coating sealing agent with excellent scratch resistance. The composite zinc coating sealing agent is prepared from the following raw materials in parts by weight and volume: 10 g / L to 200 g / L of sodium metasilicate pentahydrate, 5 g / L to 100 g / L of triethanolamine, 50 g / L to 300 g / L of waterborne polyurethane resin, 10 g / L to 200 g / L of a silane coupling agent and 0.5 g / L to 50 g / L of auxiliaries. The sealing agent has excellent scratch resistance and corrosion resistance. The invention further provides a preparation method of the sealing agent.

Description

technical field

[0001] The invention relates to the field of electrogalvanized sealant, in particular to a composite galvanized layer sealant with excellent scratch resistance and a preparation method thereof. Background technique

[0002] In the barrel plating process of electro-galvanizing, since the workpieces collide with each other on the rollers, it is easy to cause bruises. After the collision, the surface of the workpieces will have defects, which will easily lead to a decrease in corrosion resistance. The function of the traditional sealant film is single, and after the film is formed on the surface of the workpiece, it has no self-healing ability for subsequent bumps. The use of traditional process sealants is more sensitive to the acidic liquid in the previous process, and is prone to precipitation or deterioration.

[0003] At present, the sealing agent can be divided into several systems: 1. Chromium-containing chromate system. Due to the chromium content of t...

Examples

Embodiment Construction

[0024] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] Composite galvanized layer sealant with excellent scratch resistance, the parts by weight of each component are: sodium metasilicate pentahydrate 10-200g / L, triethanolamine 5-100g / L, water-based polyurethane resin 50-300g / L , silane coupling agent 10-200g / L, additive 0.5-50g / L, sodium metasilicate pentahydrate will re-dissolve a small part after contact with water after being bruised, and can fill the bruised part after dissolution and regenerate Repair the bruised position, when the silane coupling agent encounters water at the bruised position, the part of the coupling agent that has not been hydrolyzed in the previous process will be hydrolyzed, and the surface of the zinc layer at the scratched position will be re-crosslinked to form a film. To repair the role, to achieve self-healing, thereby improving corrosion resistance and sc...

technical field

[0001] The invention relates to the field of electrogalvanized sealant, in particular to a composite galvanized layer sealant with excellent scratch resistance and a preparation method thereof. Background technique

[0002] In the barrel plating process of electro-galvanizing, since the workpieces collide with each other on the rollers, it is easy to cause bruises. After the collision, the surface of the workpieces will have defects, which will easily lead to a decrease in corrosion resistance. The function of the traditional sealant film is single, and after the film is formed on the surface of the workpiece, it has no self-healing ability for subsequent bumps. The use of traditional process sealants is more sensitive to the acidic liquid in the previous process, and is prone to precipitation or deterioration.

[0003] At present, the sealing agent can be divided into several systems: 1. Chromium-containing chromate system. Due to the chromium content of t...

Examples

Embodiment Construction

[0024] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] Composite galvanized layer sealant with excellent scratch resistance, the parts by weight of each component are: sodium metasilicate pentahydrate 10-200g / L, triethanolamine 5-100g / L, water-based polyurethane resin 50-300g / L , silane coupling agent 10-200g / L, additive 0.5-50g / L, sodium metasilicate pentahydrate will re-dissolve a small part after contact with water after being bruised, and can fill the bruised part after dissolution and regenerate Repair the bruised position, when the silane coupling agent encounters water at the bruised position, the part of the coupling agent that has not been hydrolyzed in the previous process will be hydrolyzed, and the surface of the zinc layer at the scratched position will be re-crosslinked to form a film. To repair the role, to achieve self-healing, thereby improving corrosion resistance and sc...

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