Water-borne epoxy primer

Abstract

The invention belongs to the field of coating, and particularly relates to a water-borne epoxy primer. Calixarene molecules are grafted to nano zinc powder through isocyanate, modified zinc powder is entwisted to a certain degree through grafted calixarene and the epoxy resin molecule structure in the stirring process, the dispersing stability of the zinc powder in the primer material is promoted, and the problems of agglomeration and sedimentation of the zinc powder in resin are solved. The water-borne epoxy primer is free of pollution to the environment, convenient to construct and harmless to the health of constructors. The drying speed of a primer film is high, the adhesive force is good, the mechanical strength is high, and the antiseptic property is excellent.

Description

technical field

[0001] The invention belongs to the field of coatings, in particular to a water-based epoxy primer. Background technique

[0002] In the steel structure anti-corrosion coating system, the zinc-rich primer is a kind of anti-corrosion coating product with zinc powder with sacrificial anode function as the main anti-rust pigment. It must have good adhesion to steel and can play an excellent role Anti-rust effect. There are three main types of zinc-rich primers: epoxy zinc-rich primers, alcohol-soluble inorganic zinc-rich primers and water-based inorganic zinc-rich primers. Among them, the anti-corrosion effect of epoxy zinc-rich primer is to protect the steel substrate by corroding sacrificial zinc powder in a corrosive environment. It is mainly divided into three types: water-soluble post-curing epoxy zinc-rich primer, water-soluble self-curing epoxy Zinc-rich primer and solvent-borne self-curing epoxy zinc-rich primer.

[0003] The anti-corrosion mechanism ...

Examples

Embodiment 1

[0026] (1) Modification of zinc powder

[0027] Add 0.8 kg of calix[6]arene and 0.1 kg of isophorone diisocyanate to 18 kg of dimethylformamide, mechanically stir and reflux for 4 hours, add 5 kg of nano-sized zinc powder to the above system, and continue to stir and reflux After 12 hours, the solvent was recovered, filtered, washed, dried, and pulverized to obtain modified zinc powder;

[0028] (2) 50 parts by weight of E-44 water-based epoxy resin, 4 parts by weight of AGE epoxy reactive diluent, and 7 parts by weight of propylene glycol methyl ether are fully mixed, then add the modified zinc powder 18 parts obtained in the step (1) wherein parts by weight, stirred at 65°C for 30 minutes to obtain component A;

[0029] (3) After fully mixing 9 parts by weight of the water-based epoxy curing agent and 50 parts by weight of deionized water, package it separately as component B.

[0030] After curing to form a film, the coating properties were tested as shown in Table 1.

Embodiment 2

[0032] (1) Modification of zinc powder

[0033] Add 1.0 kg of calix[8]arene and 0.1 kg of isophorone diisocyanate to 18 kg of dimethylformamide, mechanically stir and reflux for 4 hours, add 5 kg of nano-sized zinc powder to the above system, and continue to stir and reflux After 12 hours, the solvent was recovered, filtered, washed, dried, and pulverized to obtain modified zinc powder;

[0034] (2) with embodiment 1;

[0035] (3) with embodiment 1.

[0036] The film-forming process was the same as in Example 1, and the coating performance was tested as shown in Table 1.

technical field

[0001] The invention belongs to the field of coatings, in particular to a water-based epoxy primer. Background technique

[0002] In the steel structure anti-corrosion coating system, the zinc-rich primer is a kind of anti-corrosion coating product with zinc powder with sacrificial anode function as the main anti-rust pigment. It must have good adhesion to steel and can play an excellent role Anti-rust effect. There are three main types of zinc-rich primers: epoxy zinc-rich primers, alcohol-soluble inorganic zinc-rich primers and water-based inorganic zinc-rich primers. Among them, the anti-corrosion effect of epoxy zinc-rich primer is to protect the steel substrate by corroding sacrificial zinc powder in a corrosive environment. It is mainly divided into three types: water-soluble post-curing epoxy zinc-rich primer, water-soluble self-curing epoxy Zinc-rich primer and solvent-borne self-curing epoxy zinc-rich primer.

[0003] The anti-corrosion mechanism ...

Examples

Embodiment 1

[0026] (1) Modification of zinc powder

[0027] Add 0.8 kg of calix[6]arene and 0.1 kg of isophorone diisocyanate to 18 kg of dimethylformamide, mechanically stir and reflux for 4 hours, add 5 kg of nano-sized zinc powder to the above system, and continue to stir and reflux After 12 hours, the solvent was recovered, filtered, washed, dried, and pulverized to obtain modified zinc powder;

[0028] (2) 50 parts by weight of E-44 water-based epoxy resin, 4 parts by weight of AGE epoxy reactive diluent, and 7 parts by weight of propylene glycol methyl ether are fully mixed, then add the modified zinc powder 18 parts obtained in the step (1) wherein parts by weight, stirred at 65°C for 30 minutes to obtain component A;

[0029] (3) After fully mixing 9 parts by weight of the water-based epoxy curing agent and 50 parts by weight of deionized water, package it separately as component B.

[0030] After curing to form a film, the coating properties were tested as shown in Table 1.

Embodiment 2

[0032] (1) Modification of zinc powder

[0033] Add 1.0 kg of calix[8]arene and 0.1 kg of isophorone diisocyanate to 18 kg of dimethylformamide, mechanically stir and reflux for 4 hours, add 5 kg of nano-sized zinc powder to the above system, and continue to stir and reflux After 12 hours, the solvent was recovered, filtered, washed, dried, and pulverized to obtain modified zinc powder;

[0034] (2) with embodiment 1;

[0035] (3) with embodiment 1.

[0036] The film-forming process was the same as in Example 1, and the coating performance was tested as shown in Table 1.

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