Long-acting anticorrosive topcoat for metal substrate

Abstract

The application belongs to the technical field of anticorrosive finish, and particularly relates to a long-acting anticorrosive finish for metal substrate. The long-acting anticorrosive finish for metal substrate is prepared from the following components in parts by weight: epoxy resin 40-50 parts, film forming agent 2-3 parts, defoaming agent 0.5-1.5 parts, antifreezing agent 0.8-1.2 parts, filler 20-30 parts, dispersing agent 3-6 parts, anticorrosive agent 0.5-0.8 parts and deionized water 30-50 parts. When the long-acting anticorrosive finish for metal substrate is prepared, the long-acting anticorrosive finish for metal substrate of the application has good adhesion, water resistance, salt mist resistance and washing resistance, and can realize long-acting anticorrosion of the metal substrate. In addition, the application selects waterborne epoxy resin as a base material and deionized water as a solvent, is non-toxic and has no solvent odor, and meets the development trend of environmental protection.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of anticorrosive finish paint, and particularly relates to a long-acting anticorrosive finish paint for metal substrate. BACKGROUND

[0002] Corrosion of metal is a phenomenon that metal is destroyed by chemical or electrochemical action of environmental medium. In the field of corrosion and anticorrosion, the main anticorrosion means applied mainly include corrosion inhibitor, electrochemical protection, anticorrosive covering layer and anticorrosive coating. Among them, coating of anticorrosive coating on the surface of metal is one of the most effective and commonly used methods, which can well isolate the corrosion medium from the metal carrier and thus avoid corrosion of the metal. Traditional anticorrosive coating and other coatings have the same formula mainly including resin base material, filler and chemical solvent, and have environmental problems. With the enhancement of social environmental protection consciousness, water-based coating (such as water-based epoxy resin) uses water as solvent, is non-toxic and has no solvent odor, and meets the environmental protection development trend. Therefore, it is of great significance to develop water-based anticorrosive coating.

[0003] The information disclosed in this Background section is only for the purpose of increasing the understanding of the background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms prior art that is already known in this field. SUMMARY

[0004] The purpose of the present application is to provide a long-acting anticorrosive finish paint for metal substrate to solve the problem that traditional anticorrosive coating and other coatings have the same formula mainly including resin base material, filler and chemical solvent, and have environmental problems.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme.

[0006] A long-acting anticorrosive finish paint for metal substrate is prepared from the following ingredients by weight parts: epoxy resin 40-50 parts, film forming agent 2-3 parts, defoaming agent 0.5-1.5 parts, antifreeze agent 0.8-1.2 parts, filler 20-30 parts, dispersing agent 3-6 parts, anticorrosive agent 0.5-0.8 parts and deionized water 30-50 parts.

[0007] Preferably, the film forming agent is Eastman dodecanol ester.

[0008] Preferably, the defoaming agent is BYK-024 of BIK.

[0009] Preferably, the antifreeze agent is ethylene glycol.

[0010] Preferably, the filler is selected from barium sulfate with a particle size of 6-10 μm.

[0011] Preferably, the dispersant is a mixture of BYK-190 and DISPERBYK163 in a mass ratio of 1:3-4.

[0012] Preferably, the preservative is polyhexamethylene biguanide hydrochloride, isothiazolinone, benzethonium chloride, zinc pyrithione or carbendazim.

[0013] The application also provides a method for preparing the metal substrate long-acting anticorrosive finish, comprising the following steps:

[0014] S1. After mixing the epoxy resin, 3 / 4 deionized water and fillers uniformly in a container, grinding and dispersing at 30-40℃, the particle size of the material after grinding and dispersing is ≤25μm;

[0015] S2. Mixing the film forming agent, defoaming agent, antifreezing agent, dispersant, preservative and the remaining deionized water with the material after grinding and dispersing in step S1 uniformly in a container, fully stirring uniformly at a rotating speed of 1500-1750r / min, to obtain the metal substrate long-acting anticorrosive finish.

[0016] Compared with the prior art, the application has the following beneficial effects:

[0017] In the preparation of the metal substrate long-acting anticorrosive finish, the metal substrate long-acting anticorrosive finish of the application has good adhesion, water resistance, salt mist resistance and washing resistance, and can realize long-acting anticorrosion of the metal substrate, by screening the specific proportion of the added dispersant. In addition, the application selects waterborne epoxy resin as the base material and deionized water as the solvent, which is non-toxic and has no solvent odor, and conforms to the development trend of environmental protection. DETAILED DESCRIPTION

[0018] The following clearly and completely describes the technical solutions of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the application.

[0019] In the following examples, the epoxy resin is waterborne epoxy resin AR555 purchased from Guangzhou Jiuyin Chemical Material Co., Ltd.

[0020] Example 1

[0021] A metal substrate long-acting anticorrosive finish is prepared from the following components: epoxy resin 40kg, film forming agent 2kg, defoaming agent 0.5kg, antifreezing agent 0.8kg, filler 20kg, dispersant 3kg, preservative 0.5kg and deionized water 50kg.

[0022] The film forming agent is Ester of dodecanol; the defoaming agent is BYK-024; the antifreeze agent is ethylene glycol; the filler is selected from barium sulfate with particle size of 6 μm; the dispersing agent is mixed by BYK-190 and DISPERBYK163 with mass ratio of 1:3; the preservative is polyhexamethylene biguanide hydrochloride.

[0023] The preparation method of the long-acting anticorrosive finish paint for metal substrate includes the following steps:

[0024] S1. After mixing the epoxy resin, 3 / 4 deionized water and filler uniformly in a container, grinding and dispersing at 40℃, the particle size of the material after grinding and dispersing is ≤25 μm;

[0025] S2. Mixing the film forming agent, defoaming agent, antifreeze agent, dispersing agent, preservative and the remaining deionized water with the material after grinding and dispersing in step S1 uniformly in a container, fully stirring uniformly at a speed of 1500 r / min, to obtain the long-acting anticorrosive finish paint for metal substrate.

[0026] Example 2

[0027] A long-acting anticorrosive finish paint for metal substrate is prepared from the following ingredients: epoxy resin 45 kg, film forming agent 2.5 kg, defoaming agent 0.75 kg, antifreeze agent 1.0 kg, filler 30 kg, dispersing agent 6 kg, preservative 0.8 kg and deionized water 50 kg.

[0028] The film forming agent is Ester of dodecanol; the defoaming agent is BYK-024; the antifreeze agent is ethylene glycol; the filler is selected from barium sulfate with particle size of 6 μm; the dispersing agent is mixed by BYK-190 and DISPERBYK163 with mass ratio of 1:4; the preservative is benzalkonium chloride.

[0029] The preparation method of the long-acting anticorrosive finish paint for metal substrate is the same as that of Example 1.

[0030] Example 3

[0031] A long-acting anticorrosive finish paint for metal substrate is prepared from the following ingredients: epoxy resin 50 kg, film forming agent 3 kg, defoaming agent 1.5 kg, antifreeze agent 1.2 kg, filler 30 kg, dispersing agent 6 kg, preservative 0.8 kg and deionized water 50 kg.

[0032] The film forming agent is ishman dodecanol ester; the defoaming agent is BYK-024; the antifreezing agent is ethylene glycol; the filler is barium sulfate with particle size of 6 μm; the dispersing agent is a mixture of BYK-190 and DISPERBYK163 with mass ratio of 1:4; the preservative is isothiazolinone.

[0033] The preparation method of the long-acting anticorrosive topcoat on the metal substrate is the same as that of Example 1.

[0034] Comparative Example 1

[0035] The difference from Example 2 is that the dispersing agent is BYK-190.

[0036] Comparative Example 2

[0037] The difference from Example 2 is that the dispersing agent is DISPERBYK163.

[0038] Comparative Example 3

[0039] The difference from Example 2 is that the dispersing agent is a mixture of BYK-190 and DISPERBYK163 with mass ratio of 1:2.

[0040] Comparative Example 4

[0041] The difference from Example 2 is that the dispersing agent is a mixture of BYK-190 and DISPERBYK163 with mass ratio of 1:5.

[0042] Performance Testing

[0043] The coatings are prepared according to Example 2 and Comparative Examples 1-4, 5wt% water is added as a diluent to adjust the paint, and a vacuum spray gun is used for spraying to prepare a plate, the substrate is Anshan 35# steel plate, and the rust grade is evaluated as D grade according to GB 8923-1988. The substrate treatment method is to wipe off the surface rust with a cotton cloth, and no other treatment is performed. The dry film thickness of spraying is 50 μm, and the performance test is carried out after natural drying for 7 days, and the results are shown in Table 2.

[0044] Table 1 Test index and test standard

[0045]

[0046] Table 2 Test results of different coatings

[0047]

[0048] As shown in Table 2, the metal base long-acting anticorrosive finish paint has better adhesion, water resistance, salt mist resistance and scrub resistance than Comparative Examples 1-4, and can realize long-acting anticorrosion of the metal base.

[0049] The foregoing description of specific exemplary embodiments of the application has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the application to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. It is intended that the scope of the application be limited not with this detailed description, but rather by the claims appended hereto.

Claims

1. A long-lasting anticorrosive topcoat for a metal substrate, characterized by, Prepared by the following ingredients in parts by weight: epoxy resin 40-50 parts, film forming agent 2-3 parts, defoaming agent 0.5-1.5 parts, antifreeze agent 0.8-1.2 parts, filler 20-30 parts, dispersant 3-6 parts, preservative 0.5-0.8 parts and deionized water 30-50 parts; wherein, The film forming agent is ishman dodecanol ester; The defoaming agent is BYK-024; The antifreeze agent is ethylene glycol; The filler is selected from barium sulfate with a particle size of 6-10 μm; The dispersant is mixed by BYK-190 and DISPERBYK163 in a mass ratio of 1:3-4; The preservative is polyhexamethylene biguanide hydrochloride, isothiazolinone, benzalkonium chloride, zinc pyrithione or carbendazim.

2. A process for preparing the long-lasting anticorrosive top coating for metal substrates according to claim 1, characterized by, The steps include: S1. The epoxy resin, 3 / 4 deionized water and filler are mixed uniformly in a container, then ground and dispersed at 30-40℃, and the particle size of the material after grinding and dispersing is ≤25 μm; S2. The film forming agent, defoaming agent, antifreeze agent, dispersant, preservative and the remaining deionized water are mixed uniformly with the material after grinding and dispersing in step S1 in a container, and fully stirred uniformly at a speed of 1500-1750 r / min, to obtain the long-acting anticorrosive finish paint for metal substrate.

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