Water-based anti-corrosion system for over-rust coating

Abstract

According to the invention, methacrylamide ethyl ethylene urea is added into the finishing paint mainly comprising the water-based hydroxyl acrylic emulsion, so that the adhesive force of a coating film can be obviously improved. Researches show that along with the increase of the dosage of methacrylamide ethyl ethylene urea, the adhesive force of a coating film is firstly increased and then tends to be gentle, however, excessive methacrylamide ethyl ethylene urea can cause the reduction of the corrosion resistance of the coating film. Therefore, in practice, based on 100 parts by weight of the water-based hydroxyl acrylic emulsion, the dosage of the methacrylamide ethyl ethylene urea needs to be controlled to be 6.2-18.9 parts by weight.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint, in particular to a water-based rusted coating anticorrosive system. BACKGROUND

[0002] Anticorrosive paint can prevent corrosion reaction caused by direct contact of corrosive substances with the surface of the base metal, and is directly coated on the surface of the object to prevent corrosion. From the principle of corrosion prevention, it can be generally divided into physical corrosion prevention and chemical corrosion prevention. Among them, chemical corrosion prevention mainly relies on the chemical inhibition of the paint to prevent rust. The existing anticorrosive paint is usually difficult to meet multiple performance requirements. Therefore, the present application aims to obtain a water-based rusted coating anticorrosive system with excellent corrosion resistance and coating adhesion. SUMMARY

[0003] The present application aims to provide a water-based rusted coating anticorrosive system with excellent corrosion resistance and coating adhesion.

[0004] The technical solution of the present application is as follows: The preparation process of a water-based rusted coating anticorrosive system includes: after the rusted steel plate is cleaned and dried, the interface agent primer, anticorrosive intermediate paint and anticorrosive topcoat are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20-25 parts by weight of butanol, 2.5-3.0 parts by weight of brominated hexadecyl benzotriazole, 50-70 parts by weight of deionized water; the anticorrosive intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15-18 parts by weight of nano barium sulfate, 5-6 parts by weight of dispersant, 7-9 parts by weight of defoaming agent, 200-220 parts by weight of water-based epoxy resin emulsion, 120 parts by weight of deionized water; the anticorrosive topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2-5.2 parts by weight of sericite, 4.5-4.8 parts by weight of dispersant, 6.0-9.0 parts by weight of defoaming agent BYK019, 6.8-8.1 parts by weight of thickening agent, 6.2-18.9 parts by weight of methacrylamide ethyl ethylene urea, 50-60 parts by weight of deionized water, 50-60 parts by weight of butanol.

[0005] Preferably, the dispersant of the anticorrosive intermediate paint is PX4585.

[0006] Preferably, the defoaming agent of the anticorrosive intermediate paint is ISLAND 2550.

[0007] Preferably, the water-based epoxy resin emulsion of the anticorrosive intermediate paint is 3520-WY-55A.

[0008] Preferably, the dispersant of the anticorrosive topcoat is DISPERBYK180.

[0009] Preferably, the thickening agent of the anticorrosive finish is BYK425.

[0010] Preferably, the neutral salt spray resistance time of the anticorrosive system is greater than 310 h.

[0011] Preferably, the amount of methacrylamidoethylethylene urea is 6.2-18.9 parts by weight, and the amount of sodium zirconium aluminate is 6.2-12.8 parts by weight.

[0012] The present application adds methacrylamidoethylethylene urea to the finish mainly of water-based hydroxyl acrylic emulsion, which can significantly improve the adhesion of the coating film. Studies have shown that, with the increase of the amount of methacrylamidoethylethylene urea, the adhesion of the coating film first increases and then tends to be flat, however, too much methacrylamidoethylethylene urea will lead to the decrease of the corrosion resistance of the coating film. Therefore, in practice, based on 100 parts by weight of water-based hydroxyl acrylic emulsion, the amount of methacrylamidoethylethylene urea needs to be controlled in the range of 6.2-18.9 parts by weight. In addition, the combination of the adhesion promoter methacrylamidoethylethylene urea and sodium zirconium aluminate can further optimize the corrosion resistance of the anticorrosive finish. DETAILED DESCRIPTION

[0013] The technical effects of the present application are verified by specific examples below, but the embodiments of the present application are not limited thereto. The water-based hydroxyl acrylic emulsion of the present application is S6520 of the brand of Newpex. Example 1

[0014] After the rusted steel plate is cleaned and dried, the interface agent primer, the anticorrosive intermediate paint and the anticorrosive finish are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20 parts by weight of butanol, 2.5 parts by weight of brominated hexadecyl benzotriazole, 50 parts by weight of deionized water; the anticorrosive intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15 parts by weight of nano barium sulfate, 5 parts by weight of dispersant (PX4585), 7 parts by weight of defoaming agent (ISLAND 2550), 200 parts by weight of water-based epoxy resin emulsion (3520-WY-55A), 120 parts by weight of deionized water; the anticorrosive finish is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2 parts by weight of sericite, 4.5 parts by weight of dispersant (DISPERBYK180), 6.0 parts by weight of defoaming agent BYK019, 6.8 parts by weight of thickening agent BYK425, 6.2 parts by weight of methacrylamidoethylethylene urea, 50 parts by weight of deionized water, 50 parts by weight of butanol. Example 2

[0015] The rusted steel plate is cleaned and dried, and then interface agent primer, anticorrosive intermediate paint and anticorrosive topcoat are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20 parts by weight of butanol, 2.5 parts by weight of brominated hexadecyl benzotriazole, 50 parts by weight of deionized water; the anticorrosive intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15 parts by weight of nano barium sulfate, 5 parts by weight of dispersant (PX4585), 7 parts by weight of defoaming agent (ISLAND 2550), 200 parts by weight of water-based epoxy resin emulsion (3520-WY-55A), 120 parts by weight of deionized water; the anticorrosive topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2 parts by weight of sericite, 4.5 parts by weight of dispersant (DISPERBYK180), 6.0 parts by weight of defoaming agent BYK019, 6.8 parts by weight of thickening agent BYK425, 9.1 parts by weight of methacrylamide ethyl ethylene urea, 50 parts by weight of deionized water, 50 parts by weight of butanol. Example 3

[0016] The rusted steel plate is cleaned and dried, and then interface agent primer, anticorrosive intermediate paint and anticorrosive topcoat are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20 parts by weight of butanol, 2.5 parts by weight of brominated hexadecyl benzotriazole, 50 parts by weight of deionized water; the anticorrosive intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15 parts by weight of nano barium sulfate, 5 parts by weight of dispersant (PX4585), 7 parts by weight of defoaming agent (ISLAND 2550), 200 parts by weight of water-based epoxy resin emulsion (3520-WY-55A), 120 parts by weight of deionized water; the anticorrosive topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2 parts by weight of sericite, 4.5 parts by weight of dispersant (DISPERBYK180), 6.0 parts by weight of defoaming agent BYK019, 6.8 parts by weight of thickening agent BYK425, 12.5 parts by weight of methacrylamide ethyl ethylene urea, 50 parts by weight of deionized water, 50 parts by weight of butanol. Example 4

[0017] The rusted steel plate is cleaned and dried, and then interface agent primer, anticorrosive intermediate paint and anticorrosive topcoat are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20 parts by weight of butanol, 2.5 parts by weight of brominated hexadecyl benzotriazole, 50 parts by weight of deionized water; the anticorrosive intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15 parts by weight of nano barium sulfate, 5 parts by weight of dispersant (PX4585), 7 parts by weight of defoaming agent (ISLAND 2550), 200 parts by weight of water-based epoxy resin emulsion (3520-WY-55A), 120 parts by weight of deionized water; the anticorrosive topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2 parts by weight of sericite, 4.5 parts by weight of dispersant (DISPERBYK180), 6.0 parts by weight of defoaming agent BYK019, 6.8 parts by weight of thickening agent BYK425, 15.3 parts by weight of methacrylamide ethyl ethylene urea, 50 parts by weight of deionized water, 50 parts by weight of butanol. Example 5

[0018] The rusted steel plate is cleaned and dried, and then interface agent primer, anticorrosive intermediate paint and anticorrosive topcoat are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20 parts by weight of butanol, 2.5 parts by weight of brominated hexadecyl benzotriazole, 50 parts by weight of deionized water; the anticorrosive intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15 parts by weight of nano barium sulfate, 5 parts by weight of dispersant (PX4585), 7 parts by weight of defoaming agent (ISLAND 2550), 200 parts by weight of water-based epoxy resin emulsion (3520-WY-55A), 120 parts by weight of deionized water; the anticorrosive topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2 parts by weight of sericite, 4.5 parts by weight of dispersant (DISPERBYK180), 6.0 parts by weight of defoaming agent BYK019, 6.8 parts by weight of thickening agent BYK425, 15.3 parts by weight of methacrylamide ethyl ethylene urea, 50 parts by weight of deionized water, 50 parts by weight of butanol. Example 6

[0019] The rusted steel plate is cleaned and dried, and then interface agent primer, anticorrosive intermediate paint and anticorrosive topcoat are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20 parts by weight of butanol, 2.5 parts by weight of brominated hexadecyl benzotriazole, 50 parts by weight of deionized water; the anticorrosive intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15 parts by weight of nano barium sulfate, 5 parts by weight of dispersant (PX4585), 7 parts by weight of defoaming agent (ISLAND 2550), 200 parts by weight of water-based epoxy resin emulsion (3520-WY-55A), 120 parts by weight of deionized water; the anticorrosive topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2 parts by weight of sericite, 4.5 parts by weight of dispersant (DISPERBYK180), 6.0 parts by weight of defoaming agent BYK019, 6.8 parts by weight of thickening agent BYK425, 8.2 parts by weight of methacrylamide ethyl ethylene urea, 7.1 parts by weight of sodium zirconium aluminate, 50 parts by weight of deionized water, 50 parts by weight of butanol.

[0020] Comparative Example 1 The rusted steel plate is cleaned and dried, and then interface agent primer, anticorrosive intermediate paint and anticorrosive topcoat are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20 parts by weight of butanol, 2.5 parts by weight of brominated hexadecyl benzotriazole, 50 parts by weight of deionized water; the anticorrosive intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15 parts by weight of nano barium sulfate, 5 parts by weight of dispersant (PX4585), 7 parts by weight of defoaming agent (ISLAND 2550), 200 parts by weight of water-based epoxy resin emulsion (3520-WY-55A), 120 parts by weight of deionized water; the anticorrosive topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2 parts by weight of sericite, 4.5 parts by weight of dispersant (DISPERBYK180), 6.0 parts by weight of defoaming agent BYK019, 6.8 parts by weight of thickening agent BYK425, 50 parts by weight of deionized water, 50 parts by weight of butanol.

[0021] Comparative Example 2 The rusted steel plate is cleaned and dried, and then the interface agent primer, the corrosion-resistant intermediate paint and the corrosion-resistant topcoat are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20 parts by weight of butanol, 2.5 parts by weight of brominated hexadecyl benzotriazole, 50 parts by weight of deionized water; the corrosion-resistant intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15 parts by weight of nano barium sulfate, 5 parts by weight of dispersant (PX4585), 7 parts by weight of defoaming agent (ISLAND 2550), 200 parts by weight of water-based epoxy resin emulsion (3520-WY-55A), 120 parts by weight of deionized water; the corrosion-resistant topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2 parts by weight of sericite, 4.5 parts by weight of dispersant (DISPERBYK180), 6.0 parts by weight of defoaming agent BYK019, 6.8 parts by weight of thickening agent BYK425, 30 parts by weight of methacrylamidoethyl ethylene urea, 50 parts by weight of deionized water, 50 parts by weight of butanol.

[0022] Comparative Example 3 The rusted steel plate is cleaned and dried, and then the interface agent primer, the corrosion-resistant intermediate paint and the corrosion-resistant topcoat are brushed in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20 parts by weight of butanol, 2.5 parts by weight of brominated hexadecyl benzotriazole, 50 parts by weight of deionized water; the corrosion-resistant intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15 parts by weight of nano barium sulfate, 5 parts by weight of dispersant (PX4585), 7 parts by weight of defoaming agent (ISLAND 2550), 200 parts by weight of water-based epoxy resin emulsion (3520-WY-55A), 120 parts by weight of deionized water; the corrosion-resistant topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2 parts by weight of sericite, 4.5 parts by weight of dispersant (DISPERBYK180), 6.0 parts by weight of defoaming agent BYK019, 6.8 parts by weight of thickening agent BYK425, 15.3 parts by weight of sodium zirconium aluminate, 50 parts by weight of deionized water, 50 parts by weight of butanol.

[0023] Next, the film adhesion (referring to GB / T5210-2006) and the neutral salt spray resistance (referring to GB / T1771-2007) of the experimental samples in Examples 1-6 and Comparative Examples 1-2 are tested. In order to ensure the comparability of each group of tests, except that the amount of methacrylamidoethyl ethylene urea and / or sodium zirconium aluminate is different, other process conditions are exactly the same. The test results are shown in Table 1.

[0024] Table 1 Test data of each sample

[0025] As can be seen from Table 1, the addition of the adhesion promoter methacrylamidoethylethylene urea to the waterborne hydroxyl acrylic emulsion-based topcoat of the present application can significantly improve the adhesion of the coating film. Studies have shown that as the amount of methacrylamidoethylethylene urea increases, the adhesion of the coating film first increases and then tends to be flat, however, too much methacrylamidoethylethylene urea can result in a decrease in the corrosion resistance of the coating film. Therefore, in practice, based on 100 parts by weight of the waterborne hydroxyl acrylic emulsion, the amount of methacrylamidoethylethylene urea needs to be controlled at 6.2-18.9 parts by weight.

[0026] The above description is only preferred embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. An anticorrosive system for waterborne rusted coating characterized by, The preparation process of the anticorrosion system comprises: cleaning and drying the rusted steel plate, and then brushing interface agent primer, anticorrosion intermediate paint and anticorrosion topcoat in sequence, wherein the interface agent primer is: 100 parts by weight of glycidyl amine type epoxy resin, 20-25 parts by weight of butanol, 2.5-3.0 parts by weight of brominated hexadecyl benzotriazole, 50-70 parts by weight of deionized water; the anticorrosion intermediate paint is: 100 parts by weight of water-based epoxy curing agent YK-811H, 15-18 parts by weight of nano barium sulfate, 5-6 parts by weight of dispersant, 7-9 parts by weight of defoaming agent, 200-220 parts by weight of water-based epoxy resin emulsion, 120 parts by weight of deionized water; the anticorrosion topcoat is: 100 parts by weight of water-based hydroxyl acrylic emulsion, 3.2-5.2 parts by weight of sericite, 4.5-4.8 parts by weight of dispersant, 6.0-9.0 parts by weight of defoaming agent BYK019, 6.8-8.1 parts by weight of thickening agent, 6.2-18.9 parts by weight of methacrylamide ethyl ethylene urea, 50-60 parts by weight of deionized water, 50-60 parts by weight of butanol.

2. An anticorrosive system for waterborne rusted coating according to claim 1, characterized in that, The dispersant of the anticorrosion intermediate paint is PX4585.

3. The anticorrosive system for water-based painting over rust according to claim 1, characterized by The defoaming agent of the anticorrosion intermediate paint is ISLAND 2550.

4. The anticorrosive system for water-based painting over rust according to Claim 1, characterized by, The water-based epoxy resin emulsion of the anticorrosion intermediate paint is 3520-WY-55A.

5. The anticorrosive system for water-based painting over rust according to claim 1, characterized by, The dispersant of the anticorrosion topcoat is DISPERBYK180.

6. The anticorrosive system for water-based painting over rust according to claim 1, characterized by The thickening agent of the anticorrosion topcoat is BYK425.

7. The anticorrosive system for water-based painting over rust according to claim 1, characterized by The anticorrosion system has a neutral salt spray resistance time of greater than 310.

Images