CN114437610A - Water-based two-component epoxy primer-topcoat coating and preparation method thereof - Google Patents

Abstract

The invention discloses a water-based two-component epoxy primer-topcoat coating and a preparation method thereof, wherein the coating is formed by mixing a component A and a component B, and the component A comprises the following components: water-based epoxy emulsion A20% -40%; water-based epoxy emulsion B10% -30%; 0.8 to 1.5 percent of wetting dispersant; 0.1 to 0.5 percent of base material wetting agent; 0.2 to 0.5 percent of defoaming agent; 0.4 to 0.7 percent of thickening agent; 0.1 to 0.2 percent of anti-settling agent; 0.2 to 0.5 percent of flatting agent; 0.3 to 0.6 percent of flash rust inhibitor; 0.1 to 0.2 percent of mildew-proof bactericide; 1.5 to 3 percent of film-forming additive; 10 to 15 percent of pigment; 4% -9% of an antirust pigment; 4% -8% of precipitated barium sulfate; 4% -8% of mica powder; 8% -20% of deionized water; the component B comprises: 75-90% of modified amine epoxy curing agent; 10 to 25 percent of deionized water. The product performance far exceeds the industrial standard (the salt spray resistance of a paint film can reach 1000h, and the impact resistance can be realized by a dry film of 170 mu m without cracking), and the invention has good economic benefit and social benefit.

Description

Water-based two-component epoxy primer-topcoat coating and preparation method thereof

Technical Field

The invention relates to an epoxy primer-topcoat coating and a preparation method thereof, in particular to a high-corrosion-resistance, high-toughness and quick-drying water-based two-component epoxy primer-topcoat coating and a preparation method thereof, which are suitable for rail transit and the like and belong to the technical field of coatings.

Background

With the increasing awareness of environmental protection of people, the water-based substitution is basically realized in the field of engineering machinery when relevant national environmental protection standards are released; in the field of rail transit, transition between oil and water is realized in city railways, and water-based paint is adopted for both automobile factories and repair; water-based coating is also tried in the aspects of motor cars and high-speed rails, and the invention is applied to the field of rail transit and replaces the traditional solvent-based products.

The epoxy resin coating has wide application in industrial anticorrosion due to excellent anticorrosion performance and mechanical performance. The water-based epoxy coating has the advantages of solvent-based epoxy coatings: the paint has excellent adhesive force on metal base materials, wide chemical medium resistance, low curing shrinkage of paint films, high hardness and good wear resistance. Meanwhile, the water-based paint takes water as a dispersion medium, has high flash point and few volatile solvents, is green and environment-friendly, and is safer to use.

The existing water-based epoxy coating is mostly used as a primer, and has the advantages of low drying rate and poor corrosion resistance, the water-based epoxy coating can be applied to occasions without weather-proof requirements, can provide decorative effect and corrosion protection, and has the advantages of high drying speed, excellent toughness and excellent performance.

Disclosure of Invention

The invention aims to develop a water-based two-component epoxy primer-topcoat coating with high corrosion resistance and high toughness, and solves the defects in the background technology.

Compared with the prior art, the waterborne two-component epoxy primer-topcoat coating disclosed by the invention is modified by using the flexible resin, so that the flexibility and the impact resistance of a paint film are excellent, a dry film of 170 mu m can pass a 50 cm-weight ball impact test without any crack, the hardness and the flexibility are balanced, and the hardness can reach 3H; the organic modified zinc orthophosphate antirust pigment is applied to obtain high corrosion resistance, neutral salt spray resistance can be achieved for 1000 hours, and secondary adhesive force is 0 grade; in addition, a double-emulsion system is adopted, an emulsion type curing agent is used, the hardness development speed can be higher, the dust sticking time is reduced, the corrosion resistance and the sagging resistance are improved, and the dry film can be made to be 300 mu m without sagging under the conditions of vertical surface spraying and vertical surface drying.

The purpose of the invention is realized by the following technical scheme.

A water-based two-component epoxy primer-topcoat coating comprises the following components: the composition comprises a component A and a component B, wherein the component A comprises the following substances in parts by mass:

the component A comprises the following substances in parts by mass:

aqueous epoxy emulsion A	20-40％
		Aqueous epoxy emulsion B	10-30％
Wetting powder	0.8-1.5％
		Leveling agent	0.2-0.5％
Defoaming agent	0.2-0.5％
		Thickening agent	0.3-0.7％
Anti-settling agent	0.1-0.3％
		Pigment(s)	10-15％
Rust-proof pigment	4-9％
		Precipitated barium sulfate	4-8％
Mica powder	4-8％
		Base material moisteningWetting agent	0.1-0.5％
Flash rust preventive	0.3-0.6％
		Mildew-proof bactericide	0.1-0.2％
Film-forming aid	1.5-3％
		Deionized water	10-25％

The component B comprises the following substances in parts by mass:

aqueous epoxy curing agent	75-90％
		Deionized water	10-25％

The component A and the component B are mixed according to the mass ratio of 3-6:1, so that the water-based two-component epoxy primer-topcoat integrated coating is obtained.

Wherein the aqueous epoxy emulsion A is based on EPIKOTE^TM1001 resin modified solid bisphenol A type epoxy resin non-ionic aqueous dispersion with the trade name of EPIKOTE^TM Resin 6529-WH-57A, the epoxy equivalent is 480-600 g/eq.

Wherein the water-based epoxy emulsion B is flexible I-type epoxy resin with the trademark of EPIKOTE^TMResin 6530-WH-57A, epoxy equivalent 500-.

Wherein the wetting dispersant is a polymeric nonionic wetting dispersant with the brand number of

VXW 6208。

Wherein the leveling agent is polyether siloxane copolymer with the mark of

Glide 450。

Wherein the defoaming agent is polyether siloxane copolymer containing gas phase silicon dioxide and has the brand number of

Foamex 810。

Wherein the thickener is organic modified hafner clay with the brand number of

LT。

Wherein the anti-settling agent is hydrophilic fumed silica with the brand number of

200。

Wherein the pigment is Mitsubishi carbon black MA100, python titanium pigment R996 and Biraphthalic blue 8631.

Wherein the precipitated barium sulfate is unmodified 1250-mesh precipitated barium sulfate.

Wherein the mica powder is wet mica powder with the particle size of 14.5-17.5 μm and the oil absorption of 33-40g/100 g.

Wherein the base material increasing wetting agent is an organic silicon gemini structure surfactant with the brand number of

Twin 4100。

Wherein the anti-flash rust agent is a chelated zinc compound dissolved in a mixture of various solvents, and the brand is NALZIN FA 179.

Wherein the mildew-proof bactericide is a high-performance bactericide aiming at a water-based system and is provided with the brand number of

LXE。

Wherein the film forming aid is Pph and PNB.

Wherein the waterborne epoxy curing agent is an emulsion type high-corrosion-resistance crosslinking agent with the trademark of EPIKURE^TM Curing Agent 6870-W-53。

Detailed Description

The following are preferred embodiments of the present invention, and the present invention is not limited to the following preferred embodiments, which are given by way of illustration and not by way of limitation. It is also pointed out that several variations and modifications of the invention based on the inventive concept herein will be apparent to those skilled in the art and are intended to be within the scope of the invention.

Example 1:

a water-based two-component epoxy primer-topcoat coating comprises the following components:

the component A comprises the following substances in parts by weight:

aqueous epoxy emulsion A	35％
		Aqueous epoxy emulsion B	20％
Wetting powder	1％
		Leveling agent	0.2％
Defoaming agent	0.3％
		Thickening agent	0.3％
Anti-settling agent	0.1％
		Pigment (I)	11.6％
Rust-proof pigment	5％
		Precipitated barium sulfate	5％
Mica powder	5％
		Substrate wetting agent	0.3％
Flash rust preventive	0.5％
		Mildew-proof bactericide	0.1％
Film forming aid	2％
		Deionized water	13.6％

The component B comprises the following substances in parts by weight:

aqueous epoxy curing agent	85％
		Deionized water	15％

Mixing the component A and the component B according to the mass ratio of 3-6:1 to obtain the water-based two-component epoxy primer-topcoat integrated coating.

Example 2:

a water-based two-component epoxy primer-topcoat coating comprises the following components:

the component A comprises the following substances in parts by weight:

aqueous epoxy emulsion A	35％
		Aqueous epoxy emulsion B	20％
Wetting powder	1％
		Leveling agent	0.2％
Defoaming agent	0.3％
		Thickening agent	0.3％
Anti-settling agent	0.1％
		Pigment (I)	11.6％
Rust-proof pigment	5％
		Precipitated barium sulfate	5％
Mica powder	5％
		Substrate wetting agent	0.3％
Flash rust preventive	0.5％
		Mildew-proof bactericide	0.1％
Film forming aid	2％
		Deionized water	13.6％

The component B comprises the following substances in parts by weight:

aqueous epoxy curing agent	75％
		Deionized water	25％

And mixing the component A and the component B according to the mass ratio of 3-6:1 to obtain the water-based two-component epoxy primer-topcoat one-in-one coating.

Example 3:

a water-based two-component epoxy primer-topcoat coating comprises the following components:

the component A comprises the following substances in parts by weight:

aqueous epoxy emulsion A	40％
		Aqueous epoxy emulsion B	15％
Wetting powder	1％
		Leveling agent	0.2％
Defoaming agent	0.3％
		Thickening agent	0.3％
Anti-settling agent	0.1％
		Pigment (I)	11.6％
Rust-proof pigment	5％
		Precipitated barium sulfate	5％
Mica powder	5％
		Substrate wetting agent	0.3％
Flash rust preventive	0.5％
		Mildew-proof bactericide	0.1％
Film forming aid	2％
		Deionized water	13.6％

The component B comprises the following substances in parts by weight:

aqueous epoxy curing agent	85％
		Deionized water	15％

Mixing the component A and the component B according to the mass ratio of 3-6:1 to obtain the water-based two-component epoxy primer-topcoat integrated coating.

Example 4:

a water-based two-component epoxy primer-topcoat coating comprises the following components:

the component A comprises the following substances in parts by weight:

aqueous epoxy emulsion A	40％
		Aqueous epoxy emulsion B	15％
Wetting powder	1％
		Leveling agent	0.2％
Defoaming agent	0.3％
		Thickening agent	0.3％
Anti-settling agent	0.1％
		Pigment (I)	11.6％
Rust-proof pigment	7％
		Precipitated barium sulfate	5％
Mica powder	5％
		Substrate wetting agent	0.3％
Flash rust preventive	0.5％
		Mildew-proof pesticideMicrobial inoculum	0.1％
Film forming aid	2％
		Deionized water	11.6％

The component B comprises the following substances in parts by weight:

aqueous epoxy curing agent	85％
		Deionized water	15％

Mixing the component A and the component B according to the mass ratio of 3-6:1 to obtain the water-based two-component epoxy primer-topcoat integrated coating.

The performance of the two-component epoxy primer-topcoat coating prepared in the four embodiments is tested, and the test results are shown in the following table. As can be seen from the following table, the water-based two-component epoxy primer-topcoat coating provided by the technical scheme of the application has the advantages of good corrosion resistance, rapid drying and excellent flexibility.

While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (18)

1. The water-based two-component epoxy primer-topcoat coating is composed of a component A and a component B, and is characterized in that: the component A comprises the following substances in parts by mass:

aqueous epoxy emulsion A20-40％Aqueous epoxy emulsion B10-30％Wetting and dispersing agent0.8-1.5％Leveling agent0.2-0.5％Defoaming agent0.2-0.5％Thickening agent0.3-0.7％Anti-settling agent0.1-0.3％Pigment (I)10-15％Rust-proof pigment4-9％Precipitated barium sulfate4-8％Mica powder4-8％Substrate wetting agent0.1-0.5％Flash rust preventive0.3-0.6％Mildew-proof bactericide0.1-0.2％Film forming aid1.5-3％Deionized water10-25％

The component B comprises the following substances in parts by mass:

aqueous epoxy curing agent75-90％Deionized water10-25％

The component A and the component B are mixed according to the mass ratio of 3-6:1, so that the water-based two-component epoxy primer-topcoat integrated coating is obtained.

2. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the aqueous epoxy emulsion a is based on EPIKOTE^TM1001 resin-modified solid bisphenol A type epoxy resin nonionic aqueous dispersion, having a trade name of EPIKOTE^TMResin 6529-WH-57A, epoxy equivalent is 480-600 g/eq.

3. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the aqueous epoxy emulsion B is a flexible "I" type epoxy resin having the trade name of EPIKOTE^TMResin 6530-WH-57A, epoxy equivalent 500-.

4. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the wetting dispersant is a polymeric nonionic wetting dispersant of brand no

VXW 6208。

5. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the leveling agent is a polyether siloxane copolymer having the designation

Glide 450。

6. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the defoamer is a polyether siloxane copolymer containing fumed silica under the brand name

Foamex 810。

7. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the thickener is an organic modified montmorillonite clay of the brand number

LT。

8. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the anti-settling agent is hydrophilic fumed silica, and the brand is

200。

9. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the pigment is Mitsubishi carbon black MA100, Dragon boa titanium white R996, Biglen blue 8631.

10. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the rust preventive pigment is an organic modified basic zinc orthophosphate hydrate with a grade of

ZPO。

11. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the precipitated barium sulfate is 1250 mesh precipitated barium sulfate with an unmodified surface.

12. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the mica powder is wet mica powder, the particle size is 14.5-17.5 μm, and the oil absorption is 33-40g/100 g.

13. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the substrate wetting agent is a silicone gemini surfactant having a brand number of

Twin 4100。

14. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the anti-flash rust agent is a chelated zinc compound dissolved in a mixture of solvents under the designation NALZIN FA 179.

15. The aqueous two-component epoxy primer-topcoat coating as claimed in claim 1, wherein the anti-mildew fungicide is a high-performance fungicide for aqueous systems and is available under the brand name

LXE。

16. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the coalescent is Pph and PNB.

17. The aqueous two-component epoxy primer-topcoat coating of claim 1, wherein the aqueous epoxy curing agent is an emulsion type highly corrosion resistant cross-linking agent having a trade name of EPIKURE^TMCuring Agent 6870-W-53。

18. The method for preparing the aqueous two-component epoxy primer-topcoat coating as claimed in claim 1, comprising the steps of:

1) adding 8-13 parts of deionized water, 0.8-1.5 parts of wetting dispersant, 0.2-0.5 part of defoaming agent, 0.3-0.7 part of thickening agent and 0.1-0.3 part of anti-settling agent into a container, dispersing for fifteen minutes at the speed of 500 revolutions per minute and 800 revolutions per minute, and uniformly mixing and stirring.

2) Then 10-15 parts of pigment, 4-9 parts of antirust pigment, 4-8 parts of precipitated barium sulfate and 4-8 parts of mica powder are added, and the mixture is fully stirred and stirred at the rotating speed of 800-.

3) Adding 20-40 parts of aqueous epoxy emulsion A, 10-30 parts of aqueous epoxy emulsion B, 0.2-0.5 part of flatting agent, 0.1-0.5 part of base material wetting agent, 0.3-0.6 part of flash rust inhibitor, 0.1-0.2 part of mildew-proof bactericide and 1.5-3 parts of film-forming assistant under the stirring condition of the rotation speed of 800-.

4) And adjusting the viscosity by using the rest 2-12 parts of deionized water to obtain the component A of the water-based two-component epoxy primer-topcoat coating.

5) 75-90 parts of water-based epoxy curing agent and 10-25 parts of deionized water are poured into a container and uniformly stirred at the speed of 500 plus 800 rpm to obtain the component B of the water-based two-component epoxy primer-topcoat coating.