CN102020909A - High-performance aqueous epoxy anticorrosive paint for steel structures - Google Patents

Abstract

The invention relates to a high-performance aqueous epoxy anticorrosive paint for steel structures, which is characterized in that the paint comprises a part A and a part B, wherein the mass ratio of the part A to the part B is 100: (30-40); the part A comprises the following components in percentage by weight: 20 to 45 percent of aqueous epoxy resin, 5 to 10 percent of rust-proofing pigment, 5 to 20 percent of tinting color, 20 to 45 percent of packing, 0.2 to 0.5 percent of thickener, 0.2 to 2 percent of flatting agent, 0.5 to 2.5 percent of other auxiliaries, and 20 to 40 percent of softened water; and the part B comprises the following components in percentage by weight: 20 to 40 percent of aqueous epoxy curing agent, 1 to 5 percent of neutralizer, 5 to 20 percent of aqueous cosolvent and 25 to 50 percent of rust-proofing pigment. The anticorrosive paint provided by the invention has the advantages of no environment pollution and high drying speed, and is safe and convenient for application.

Description

Steel construction high-performance water-based epoxy antifouling paste

Technical field

The present invention relates to a kind of water-borne coatings, especially a kind of high-performance water-based epoxy antifouling paste that is used for steel construction.

Background technology

Traditional protective system mostly is solvent based coating, common kind has the coating of types such as alkyd, epoxy, chlorinated rubber, vinylformic acid, urethane, wherein all contain a large amount of organic solvents, these solvents can discharge in production and construction process, to the healthy harmful and contaminate environment of workmen.Just carried out environmentally friendly antiseptic and rustproof lacquer developments such as high solid, solvent-free, powder and water-borne coatings abroad from the beginning of the seventies, wherein water-miscible paint is lower because of cost, and construction safety is convenient, and thickness is controlled easily, obtains more research.But, do not obtain big progress over a long time because of technical difficulty is bigger.Since the mid-80, the countries in the world legislations of environmental protection causes the upsurge of water-based anticorrosive paint research to the restriction increasingly stringent of volatile organic solvent in the coating (VOC) content.

Water-based anticorrosive paint becomes the focus that domestic and international coating circle is is competitively researched and developed with its characteristics energy-conservation and safe in utilization.Along with the foundation of various environmental protection laws and regulations, steel construction changes into to inevitable with the protective system environmental protection.

The development of water-based anticorrosive paint has also been experienced from low-grade water soluble acrylic acid, water-soluble alcohol acid etc., but low-grade water-miscible paint all can not satisfy the steel construction application of high request fully, along with the release of the two components resin of water-base epoxy, water-based anticorrosive paint also can be made as the preserved aqueous coating of the long-acting height of solvent based coating.

Summary of the invention

The objective of the invention is at above-mentioned deficiency, provide that a kind of antiseptic property is good, environmental protection, economic high-performance water-based epoxy antifouling paste.

Technical scheme of the present invention is: a kind of water-base epoxy anti-corrosion primer, comprise A component and B component, and the A component is 100: 30～40 with B constituent mass ratio.

Wherein the A component comprises: aqueous epoxy resins 20～45wt%, rust-stabilising pigment 5～10wt%, tinting pigment 5～20wt%, filler 20～45wt%, thickening material 0.2～0.5wt%, flow agent 0.2～2wt%, other auxiliary agent 0.5～2.5wt%, softening water 20～40wt%;

Wherein the B component comprises: aqueous epoxy curing agent 20～40wt%, neutralizing agent 1～5wt%, water-based solubility promoter 5～20wt%; Rust-stabilising pigment 25～50wt%.

Described other auxiliary agent comprises dispersion agent, wetting agent and defoamer, and every kind of auxiliary agent adds in right amount.

Preferably, described aqueous epoxy curing agent is that solid part is the modified fatty amine affixture of 60wt%, and content is 20～40wt%.

Preferably, described active rust-stabilising pigment can be one or more the mixture in zinc phosphate, zinc molybdate, the aluminium triphosphate.The use of active rust-stabilising pigment can improve the rust-proof effect of water-repellent preservation lacquer.

Preferably, described tinting pigment can be one or more a mixture of iron oxide black, red iron oxide, carbon black, titanium dioxide.

Preferably, described filler can be one or more the mixture in talcum powder, mica powder, silicon powder, light calcium carbonate, calcined kaolin or the process white.

Preferably, described solubility promoter can be an ethylene glycol monomethyl ether.

Preferably, described thickening material is the Natvosol class, and its content is 0.2～0.4wt%.

Preferably, described flow agent is organic-silicon-modified siloxanes, and its content is 0.2～1.0wt%.

Preferably, described dispersion agent is sodium, ammonium, the amine salt of alkenyl monomer (vinylbenzene, diisobutylene) and unsaturated carboxylic acid (vinylformic acid, methacrylic acid, maleic acid) multipolymer.

Preferably, described defoamer is an organic silicon modified by polyether.

Preferably, described water-base epoxy dispersion is that solid part is the water dispersion of the Resins, epoxy of 40～60wt%; Its content is 20～40wt%.

Preferably, described softening water is deionized water or distilled water, SO ₄ ^2-, Cl ^-, Na ⁺, K ⁺, Ca ²⁺Deng the total amount of water soluble ion less than 100ppm, specific conductivity＜20 μ m/cm.

Preferably, described neutralizing agent is the volatility organic amine.

Beneficial effect of the present invention is: this aqueous epoxy anticorrosive paint environmentally safe, and healthy harmless to the workmen, safe and convenient to use.Rate of drying is fast, paint film physical strength height, and strong adhesion, the antiseptic property excellence is applicable to the anti-corrosion primer of making steel construction.Except can being used for general steel construction, also can be widely used in the vehicles such as automobile, train, boats and ships, steel construction such as bridge, iron tower, door and window, ferrous materials is antirust in the facilities such as basin, pipeline.

Embodiment

Table 1 is embodiments of the invention, and wherein each component concentration is the quality percentage composition, but the present invention is not limited to following example.

Table 1

In the table 1, the modified fatty amine affixture that it is 60wt% that aliphatic amide modified water-soluble epoxy hardener can replace with other solid part equally; Zinc phosphate and aluminium triphosphate all can replace with one or more the mixture in zinc molybdate, basic lead chromate silicate, the barium metaborate equally; 800 order talcum powder, 1250 order silicon powders and 600 order mica powders all can replace with one or more the mixture in light calcium carbonate, calcined kaolin, process white, natural barite powder, the calcite in powder equally; Titanium dioxide and red iron oxide can replace with one or more the mixture in carbon black, the phthalein cyanogen indigo plant etc. equally; Flow agent can replace with other organic-silicon-modified siloxanes equally; Dispersion agent 5040 and dispersion agent T-731 can replace with sodium, ammonium, the amine salt of other alkenyl monomer (vinylbenzene, diisobutylene) and unsaturated acid (vinylformic acid, methacrylic acid, maleic acid) multipolymer equally; Wetting agent SURFYNOL GA can replace with other polyether-modified alkynol equally; Defoamer NXZ can replace with other organic silicon modified by polyether equally; The epoxy equivalent (weight) that it is 50-60% that EPI-KOTE 3520 can replace with other solid part equally is the water dispersion of 475 solid epoxy; Neutralizing agent is the volatility organic amine, as monoethanolamine, 2-amino-1-propyl alcohol, N-ethylmorpholine, triethylamine and N.N dimethylethanolamine.

Anti-corrosion primer performance by above-mentioned formulation is listed in table 2.Comparative Examples 1# bi-component aqueous epoxy lacquer produced in USA in the table 2, Comparative Examples 2# is the bi-component aqueous epoxy lacquer of domestic production.

Table 2

Coating preparation technology is:

The A component:

1. water-base resin, anti-settling agent, dispersion agent, wetting agent, the defoamer that adding is accurately measured in joining the slurry container with adjustable high-speed dispersion machine (down together), stirred 5-10 minute, and rotating speed is 400-600 rev/min.

2. add tinting pigment, filler, stirred 5-10 minute, rotating speed is 800-1200 rev/min.

3. be ground to fineness less than 50 μ m with sand mill, ball mill or three-roller.

4. add remaining water-based auxiliary agent, stirred 30 minutes.

5. use 100 order copper mesh or nylon net filters.

6. pack with big mouthful plastic tank or tinplate bucket, get finished product.

The B component

1. add aqueous epoxy curing agent in the paint mixing tank.

2. add solubility promoter, 300 rev/mins, stirred 10 minutes.

3. add rust-stabilising pigment, stirred 20 minutes.

4. be ground to fineness less than 50 μ m with sand mill, ball mill or three-roller.

5. use 100 order copper mesh or nylon net filters.

6. pack with big mouthful plastic tank or tinplate bucket, get finished product.

A, B component mix according to 100: 35 proportionings of mass ratio during use, can construct after stirring.

Claims (1)

1. a steel construction high-performance water-based epoxy antifouling paste is characterized in that it comprises A component and B component, and the A component is 100: 30～40 with B constituent mass ratio;

Wherein the A component comprises: aqueous epoxy resins 20～45wt%, rust-stabilising pigment 5～10wt%, tinting pigment 5～20wt%, filler 20～45wt%, thickening material 0.2～0.5wt%, flow agent 0.2～2wt%, other auxiliary agent 0.5～2.5wt%, softening water 20～40wt%;

Wherein the B component comprises: aqueous epoxy curing agent 20～40wt%, neutralizing agent 1～5wt%, water-based solubility promoter 5～20wt%; Rust-stabilising pigment 25～50wt%.