A modified water-based zinc-rich coating

Abstract

The invention relates to metal corrosion prevention techniques and provides modified waterborne zinc-rich paint. The paint is prepared from flaky zinc powder and a waterborne adhesive base material in a weight ratio of 0.3-1.2:1. The waterborne adhesive base material is prepared from, by weight, 20-40 parts of potassium silicate, 10-20 parts of potassium methyl silicate, 10-20 parts of emulsified asphalt, 0.5-1 part of sodium bentonite, 0.2-0.5 part of tributyl phosphate, 0.2-0.5 part of sodium polyacrylate and 28.6-38.6 parts of water. The modified waterborne zinc-rich paint has advantages that toughness and film forming performance of a polysiloxane structure can be improved, and improvement of comprehensive performances of a zinc coating is benefited; due to excellent corrosion resistance of asphalt, corrosion resistance of a waterborne zinc-rich coating can be improved remarkably; depolymerization and electrochemical corrosion of the polysiloxane structure under water action can be reduced, and anticorrosion service life of the zinc-rich coating can be prolonged.

Description

technical field

[0001] The invention relates to a modified water-based zinc-rich coating, which belongs to metal anticorrosion technology. Background technique

[0002] Inorganic zinc-rich coatings are formed by reacting spherical or flake zinc powder with silicate in the base material to form a structurally stable inorganic zinc silicate complex inside the coating through chemical bonds, and finally form on the surface of the metal to be protected. A protective film. Inorganic zinc-rich coatings have the characteristics of environmental protection, unaffected welding with paint, outstanding weather resistance and excellent corrosion resistance, and have become widely used coatings in the fields of atmospheric corrosion protection and marine heavy corrosion protection of steel structures. However, inorganic zinc-rich coatings also have disadvantages, such as high brittleness of the coating, poor mechanical properties, and large-scale peeling off under the action of external...

Examples

preparation example Construction

[0018] The preparation method of this modified water-based zinc-rich paint comprises the following steps:

[0019] (1) get each raw material component by described proportioning;

[0020] (2) Add water and sodium bentonite to the mixing tank and stir evenly; then add potassium silicate and potassium methyl silicate and stir evenly; then add emulsified asphalt and stir evenly; finally add tributyl phosphate and sodium polyacrylate , and stir evenly to obtain a water-based binder base material;

[0021] (3) adding scaly zinc powder to the water-based binder base material, and stirring evenly to obtain a water-based inorganic zinc-rich coating.

[0022] The stirring time and stirring speed in the preparation process can be adjusted according to the actual situation, and the stirring is kept during the process of adding each raw material component. In the embodiment provided by the present invention: after adding water and sodium bentonite, the stirring speed is controlled to be...

Embodiment 1

[0026] A modified water-based zinc-rich coating

[0027] Formula: including flaky zinc powder (particle size 200 mesh) and water-based binder base material, the weight ratio is 0.64:1. Wherein, the water-based binder base material includes the following components in parts by weight: Potassium Silicate (SiO 2 : K 2 O molar ratio is 5.0, solid content 20%) 40 parts, potassium methyl silicate (solid content 40%) 10 parts, emulsified pitch (pH=10, solid content 20%) 20 parts, sodium bentonite 0.5 part, phosphoric acid 0.2 parts of tributyl ester, 0.2 parts of sodium polyacrylate, and 29.1 parts of water.

[0028] Preparation process: Add water and sodium bentonite to the mixing tank, stir for 10 minutes (rotation speed 2000rpm), add potassium silicate and potassium methyl silicate, stir for 10 minutes (rotation speed 800rpm), slowly add emulsified asphalt (200ml / min), Continue to stir for 5 minutes (rotating speed 1000 rpm), then add tributyl phosphate and sodium polyacrylate,...

Embodiment 2

[0031] A modified water-based zinc-rich coating

[0032] Recipe: including flaky zinc powder (particle size 500 mesh) and water-based binder base material, the weight ratio is 0.8:1, wherein, the water-based binder base material includes the following components by weight: potassium silicate (SiO 2 : K 2 O molar ratio is 5.5, solid content 30%) 35 parts, potassium methyl silicate (solid content 20%) 20 parts, emulsified asphalt (pH=12, solid content 40%) 10 parts, sodium bentonite 1 part, phosphoric acid 0.5 parts of tributyl ester, 0.5 parts of sodium polyacrylate, and 33 parts of water.

[0033] Preparation process: Add water and sodium bentonite to the mixing tank, stir for 10 minutes (rotating speed 2000rpm), add potassium silicate and potassium methyl silicate, stir for 20min (rotating speed 500rpm), slowly add emulsified asphalt (50ml / min), Continue to stir for 10 minutes (rotating speed 500 rpm), then add tributyl phosphate and sodium polyacrylate, stir evenly to obta...

technical field

[0001] The invention relates to a modified water-based zinc-rich coating, which belongs to metal anticorrosion technology. Background technique

[0002] Inorganic zinc-rich coatings are formed by reacting spherical or flake zinc powder with silicate in the base material to form a structurally stable inorganic zinc silicate complex inside the coating through chemical bonds, and finally form on the surface of the metal to be protected. A protective film. Inorganic zinc-rich coatings have the characteristics of environmental protection, unaffected welding with paint, outstanding weather resistance and excellent corrosion resistance, and have become widely used coatings in the fields of atmospheric corrosion protection and marine heavy corrosion protection of steel structures. However, inorganic zinc-rich coatings also have disadvantages, such as high brittleness of the coating, poor mechanical properties, and large-scale peeling off under the action of external...

Examples

preparation example Construction

[0018] The preparation method of this modified water-based zinc-rich paint comprises the following steps:

[0019] (1) get each raw material component by described proportioning;

[0020] (2) Add water and sodium bentonite to the mixing tank and stir evenly; then add potassium silicate and potassium methyl silicate and stir evenly; then add emulsified asphalt and stir evenly; finally add tributyl phosphate and sodium polyacrylate , and stir evenly to obtain a water-based binder base material;

[0021] (3) adding scaly zinc powder to the water-based binder base material, and stirring evenly to obtain a water-based inorganic zinc-rich coating.

[0022] The stirring time and stirring speed in the preparation process can be adjusted according to the actual situation, and the stirring is kept during the process of adding each raw material component. In the embodiment provided by the present invention: after adding water and sodium bentonite, the stirring speed is controlled to be...

Embodiment 1

[0026] A modified water-based zinc-rich coating

[0027] Formula: including flaky zinc powder (particle size 200 mesh) and water-based binder base material, the weight ratio is 0.64:1. Wherein, the water-based binder base material includes the following components in parts by weight: Potassium Silicate (SiO 2 : K 2 O molar ratio is 5.0, solid content 20%) 40 parts, potassium methyl silicate (solid content 40%) 10 parts, emulsified pitch (pH=10, solid content 20%) 20 parts, sodium bentonite 0.5 part, phosphoric acid 0.2 parts of tributyl ester, 0.2 parts of sodium polyacrylate, and 29.1 parts of water.

[0028] Preparation process: Add water and sodium bentonite to the mixing tank, stir for 10 minutes (rotation speed 2000rpm), add potassium silicate and potassium methyl silicate, stir for 10 minutes (rotation speed 800rpm), slowly add emulsified asphalt (200ml / min), Continue to stir for 5 minutes (rotating speed 1000 rpm), then add tributyl phosphate and sodium polyacrylate,...

Embodiment 2

[0031] A modified water-based zinc-rich coating

[0032] Recipe: including flaky zinc powder (particle size 500 mesh) and water-based binder base material, the weight ratio is 0.8:1, wherein, the water-based binder base material includes the following components by weight: potassium silicate (SiO 2 : K 2 O molar ratio is 5.5, solid content 30%) 35 parts, potassium methyl silicate (solid content 20%) 20 parts, emulsified asphalt (pH=12, solid content 40%) 10 parts, sodium bentonite 1 part, phosphoric acid 0.5 parts of tributyl ester, 0.5 parts of sodium polyacrylate, and 33 parts of water.

[0033] Preparation process: Add water and sodium bentonite to the mixing tank, stir for 10 minutes (rotating speed 2000rpm), add potassium silicate and potassium methyl silicate, stir for 20min (rotating speed 500rpm), slowly add emulsified asphalt (50ml / min), Continue to stir for 10 minutes (rotating speed 500 rpm), then add tributyl phosphate and sodium polyacrylate, stir evenly to obta...

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