Epoxy primer for high-speed rail shell and preparation method of epoxy primer

Abstract

The invention relates to the technical field of epoxy primer, in particular to epoxy primer for a high-speed rail shell and a preparation method of the epoxy primer. The paint at least comprises the following preparation raw materials in parts by weight: 40-50 parts of epoxy emulsion, 5-15 parts of an epoxy curing agent, 15-30 parts of pigment, 5-20 parts of filler, 1-5 parts of a solvent, 0.1-1 part of a thickening agent, 0.1-0.5 part of a wetting agent, 0.1-2 parts of a dispersing agent, 0.1-0.5 part of a defoaming agent, 0.1-1 part of an anti-flash rust auxiliary agent, 0.1-2 parts of an adhesion promoter, 0.1-0.5 part of an anti-sagging auxiliary agent and 10-60 parts of deionized water. The epoxy primer provided by the invention can simultaneously realize excellent adhesion and salt spray resistance on the surfaces of carbon steel, aluminum alloy, carbon fiber and glass fiber reinforced plastic, and meets the protection requirements of high-speed rail vehicle bodies.

Description

Technical Field

[0001] The invention relates to the technical field of epoxy primers, in particular to an epoxy primer for a high-speed railway shell and a preparation method thereof. Background Art

[0002] With the development of my country's high-speed rail technology and the country's strong investment in railway construction, locomotives and high-speed rail motor vehicles are increasingly used in different regions and in different harsh environments, and the requirements for vehicle driving performance are also increasing. Usually, the high-speed rail body protective coating is epoxy anticorrosion primer, putty, polyurethane mid-coat and polyurethane topcoat starting from the substrate. Among them, epoxy anticorrosion primer is a very critical layer in the entire composite coating, which plays a connecting role. Once the EMU substrate loses the protection of the coating, more unpredictable problems and dangers will appear. However, although the current epoxy primer can meet the adhesion and salt spray resistance requirements of aluminum alloys, the adhesion and salt spray resistance of carbon steel, carbon fiber and glass fiber reinforced plastics need to be further improved. For example, a Chinese patent (authorization announcement number is CN107286756B) discloses a low-temperature resistant epoxy anticorrosion coating and a preparation method and application, which can achieve good adhesion on the surface of aluminum alloys and meet the needs of low-temperature use environments, but the adhesion and salt spray resistance of carbon steel, carbon fiber and glass fiber reinforced plastics need to be further improved. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an epoxy primer for high-speed rail shell. By optimizing the product formula, the provided epoxy primer can simultaneously achieve excellent adhesion and salt spray resistance on the surfaces of carbon steel, aluminum alloy, carbon fiber and fiberglass, thereby meeting the protection needs of high-speed rail body.

[0004] On the one hand, the present invention provides an epoxy primer for high-speed railway shell. The raw materials for preparation include at least 40-50 parts of epoxy emulsion, 5-15 parts of epoxy curing agent, 15-30 parts of pigment, 5-20 parts of filler, 1-5 parts of solvent, 0.1-1 parts of thickener, 0.1-0.5 parts of wetting agent, 0.1-2 parts of dispersant, 0.1-0.5 parts of defoaming agent, 0.1-1 parts of anti-flash rust additive, 0.1-2 parts of adhesion promoter, 0.1-0.5 parts of anti-sagging additive, and the balance is made up of deionized water.

[0005] As a preferred technical solution, the epoxy emulsion is a water-based epoxy resin emulsion, and the viscosity of the water-based epoxy resin emulsion at 25° C. is 400-8000 mPa·s, preferably 400-4000 mPa·s.

[0006] Preferably, the epoxy equivalent of the waterborne epoxy resin emulsion is 400-1200 g / mol, preferably 460-630 g / mol.

[0007] Most preferably, the model of the water-based epoxy resin emulsion is Qirun EP137.

[0008] As a preferred technical solution, the epoxy curing agent is a modified amine epoxy curing agent.

[0009] Preferably, the viscosity of the modified amine epoxy curing agent at 25° C. is 4000-40000 mPa·s, preferably 4000-11000 mPa·s.

[0010] Preferably, the modified amine epoxy curing agent has an active hydrogen equivalent of 100-200 g / mol, preferably 150 g / mol.

[0011] Most preferably, the model of the modified amine epoxy curing agent is Qirun EH3504.

[0012] As a preferred technical solution, the pigment at least includes an anti-rust pigment.

[0013] Preferably, the anti-rust pigment is selected from at least one of iron titanium powder, zinc phosphate and aluminum tripolyphosphate, preferably aluminum tripolyphosphate.

[0014] As a preferred technical solution, the pigment also includes at least one of red iron oxide, yellow iron oxide and titanium dioxide.

[0015] Preferably, the pigment includes aluminum tripolyphosphate, red iron oxide, yellow iron oxide, and titanium dioxide.

[0016] The mass ratio of the aluminum tripolyphosphate, red iron oxide, yellow iron oxide and titanium dioxide is (8-14): (2-4): (1-3): (8-12), preferably (8-14): 3: 2: 10.

[0017] As a preferred technical solution, the particle size of the filler is 1-10 μm, preferably 2-2.4 μm.

[0018] As a preferred technical solution, the filler is selected from at least one of talc, barium sulfate and calcium carbonate, preferably barium sulfate.

[0019] As a preferred technical solution, the dispersant is selected from at least one of Digo 755W, Bi Ke 190, and Digo 760W, preferably Digo 755W.

[0020] As a preferred technical solution, the defoaming agent includes at least Digo 810.

[0021] As a preferred technical solution, the anti-flash rust additive includes at least RB-60.

[0022] As a preferred technical solution, the anti-sagging agent at least includes Hemmings LT.

[0023] As a preferred technical solution, the adhesion promoter is selected from at least one of Maitu MP200, Nanjing Silicon Union KH560, and Guangdong Jiaming CM-8011, preferably Maitu MP200.

[0024] As a preferred technical solution, the solvent at least includes propylene glycol methyl ether.

[0025] As a preferred technical solution, the wetting agent includes at least Digo 4100.

[0026] As a preferred technical solution, the thickener at least includes a hydrophobically modified polyurethane thickener.

[0027] The present invention optimizes the selection and combination of epoxy emulsion, epoxy curing agent, anti-rust pigment, dispersant and adhesion promoter in the system, and under the joint action of other raw materials in the system, the provided epoxy primer has excellent stability, and realizes the pull-out adhesion of carbon steel and aluminum alloy ≥7MPa, salt spray resistance ≥800h; the cross-cutting adhesion of carbon fiber and glass fiber reinforced plastic surface ≥7MPa, and salt spray performance ≥1500h. Specifically, by using an aqueous epoxy resin emulsion with an epoxy equivalent of 460-630g / mol and a viscosity of 400-4000mPa·s at 25°C, an epoxy curing agent with a viscosity of 4000-11000mPa·s at 25°C and an active hydrogen equivalent of 100-200g / mol, and adding aluminum tripolyphosphate, the adhesion performance and corrosion resistance of the subsequent paint film are guaranteed. Furthermore, by introducing Digo 755W as a dispersant, the pigments and fillers in the system are well dispersed, ensuring the stability of the product. In addition, the present invention found in the process of exploration that by introducing Maitu MP200, the adhesion of the product is improved while also helping to improve the salt spray resistance of the product.

[0028] Another aspect of the present invention provides a method for preparing an epoxy primer for a high-speed railway shell, comprising at least the following steps:

[0029] (1) adding 80-99 wt % deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0030] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 40-60wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0031] (3) When using, stir and mix the main agent and curing agent.

[0032] The epoxy primer provided by the invention has readily available raw materials, a simple preparation method, high production efficiency, and is easy to realize large-scale industrial production, promotion and application.

[0033] Beneficial Effects

[0034] 1. The present invention provides an epoxy primer for high-speed rail shells. By optimizing the product formula, the provided epoxy primer can simultaneously achieve excellent adhesion and salt spray resistance on the surfaces of carbon steel, aluminum alloy, carbon fiber and fiberglass, meeting the protection requirements of high-speed rail bodies.

[0035] 2. The present invention optimizes the selection and combination of epoxy emulsion, epoxy curing agent, anti-rust pigment, dispersant and adhesion promoter in the system. Under the joint action of other raw materials in the system, the provided epoxy primer has excellent stability and achieves a pull-out adhesion of ≥7MPa and salt spray resistance of ≥800h on carbon steel and aluminum alloy; a cross-cut adhesion of ≥7MPa and a salt spray resistance of ≥1500h on the surface of carbon fiber and glass fiber reinforced plastic.

[0036] 3. The present invention adopts an aqueous epoxy resin emulsion with an epoxy equivalent of 460-630 g / mol and a viscosity of 400-4000 mPa·s at 25°C, an epoxy curing agent with a viscosity of 4000-11000 mPa·s at 25°C and an active hydrogen equivalent of 100-200 g / mol, and adds aluminum tripolyphosphate to ensure the adhesion performance and corrosion resistance of the subsequent paint film.

[0037] 4. The primer provided by the present invention, by introducing Digo 755W as a dispersant, has a good dispersing effect on the pigments and fillers in the system, thereby ensuring the stability of the product.

[0038] 5. The epoxy primer provided by the present invention has readily available raw materials, a simple preparation method, and high production efficiency, and is easy to realize large-scale industrial production, promotion, and application. DETAILED DESCRIPTION

[0039] Example 1

[0040] Embodiment 1 of the present invention provides an epoxy primer for high-speed railway shell. The raw materials for preparation include, by weight, 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 23 parts of pigment, 14 parts of filler, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoaming agent, 0.7 parts of anti-flash rust additive, 1 part of adhesion promoter, 0.3 parts of anti-sagging additive and 15.3 parts of deionized water.

[0041] The epoxy emulsion is a water-based epoxy resin emulsion, the viscosity of the water-based epoxy resin emulsion at 25° C. is 400-4000 mPa·s, the epoxy equivalent of the water-based epoxy resin emulsion is 460-630 g / mol, and the model of the water-based epoxy resin emulsion is Qirun EP137.

[0042] The epoxy curing agent is a modified amine epoxy curing agent, the viscosity of the modified amine epoxy curing agent at 25° C. is 4000-11000 mPa·s, the active hydrogen equivalent of the modified amine epoxy curing agent is 150 g / mol, and the model of the modified amine epoxy curing agent is Qirun EH3504.

[0043] The pigments include aluminum tripolyphosphate (Xinsheng aluminum tripolyphosphate MY-O), red iron oxide (iron oxide red one product S130), yellow iron oxide (iron oxide yellow one product S313), and titanium dioxide (Longbai R996).

[0044] The mass ratio of the aluminum tripolyphosphate, red iron oxide, yellow iron oxide and titanium dioxide is 14:3:2:10.

[0045] The filler is barium sulfate, with a particle size of 2-2.4 μm and a model of Jiaoling BS-115.

[0046] The dispersant is Digo 755W.

[0047] The defoaming agent is Digo 810.

[0048] The anti-flash rust additive is RB-60.

[0049] The anti-sagging agent is Hemmings LT.

[0050] The adhesion promoter is Momentive MP200.

[0051] The solvent is propylene glycol methyl ether.

[0052] The wetting agent is Digo 4100.

[0053] The thickener is a hydrophobically modified polyurethane thickener, model number is ACRYSOL TM RM-12W (Dow Chemical).

[0054] Embodiment 1 of the present invention provides a method for preparing an epoxy primer for a high-speed railway shell, comprising the following steps:

[0055] (1) adding 84 wt % deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0056] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0057] (3) When using, stir and mix the main agent and curing agent.

[0058] Example 2

[0059] Example 2 of the present invention provides an epoxy primer for high-speed rail shell and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, by weight, the preparation raw materials include 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 23 parts of pigment, 14 parts of filler, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoamer, 0.8 parts of anti-flash rust aid, 1 part of adhesion promoter, 0.3 parts of anti-sagging agent, and 15 parts of deionized water. The adhesion promoter is replaced by Nanjing Silicon Union KH560. The preparation method of epoxy primer for high-speed rail shell comprises the following steps:

[0060] (1) adding 85 wt % of deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0061] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0062] (3) When using, stir and mix the main agent and curing agent.

[0063] Example 3

[0064] Example 3 of the present invention provides an epoxy primer for high-speed rail shell and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, by weight, the preparation raw materials include 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 23 parts of pigment, 14 parts of filler, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoamer, 0.7 parts of anti-flash rust aid, 1 part of adhesion promoter, 0.3 parts of anti-sagging agent, and 14.1 parts of deionized water. The adhesion promoter is replaced with Guangdong Jiaming CM-8011. The preparation method of epoxy primer for high-speed rail shell comprises the following steps:

[0065] (1) adding 91 wt % deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0066] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0067] (3) When using, stir and mix the main agent and curing agent.

[0068] Example 4

[0069] Example 4 of the present invention provides an epoxy primer for a high-speed rail shell and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, by weight, the raw materials for preparing the epoxy primer for the high-speed rail shell include 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 23 parts of pigment, 14 parts of filler, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoamer, 0.7 parts of anti-flash rust aid, 0.3 parts of anti-sagging aid, and 16.3 parts of deionized water. The preparation method of the epoxy primer for the high-speed rail shell comprises the following steps:

[0070] (1) adding 85 wt % of deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0071] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0072] (3) When using, stir and mix the main agent and curing agent.

[0073] Example 5

[0074] Example 5 of the present invention provides an epoxy primer for a high-speed railway shell and a preparation method thereof. The specific implementation method is the same as that of Example 4, except that the dispersant is replaced by BYK 190. In parts by weight, the raw materials for preparing the epoxy primer for the high-speed railway shell include 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 23 parts of pigment, 14 parts of filler, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoaming agent, 0.8 parts of anti-flash rust aid, 0.3 parts of anti-sagging aid, and 16 parts of deionized water. The preparation method of epoxy primer for a high-speed railway shell comprises the following steps:

[0075] (1) adding 86 wt % of deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0076] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0077] (3) When using, stir and mix the main agent and curing agent.

[0078] Example 6

[0079] Example 6 of the present invention provides an epoxy primer for a high-speed railway shell and a preparation method thereof. The specific implementation method is the same as that of Example 4, except that the dispersant is replaced with Digo 760W. In parts by weight, the raw materials for preparing the epoxy primer for the high-speed railway shell include 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 23 parts of pigment, 14 parts of filler, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoaming agent, 0.7 parts of anti-flash rust aid, 0.3 parts of anti-sagging aid, and 15.1 parts of deionized water. The preparation method of epoxy primer for high-speed railway shell comprises the following steps:

[0080] (1) adding 91 wt % deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0081] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0082] (3) When using, stir and mix the main agent and curing agent.

[0083] Example 7

[0084] Example 7 of the present invention provides an epoxy primer for a high-speed rail shell and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, by weight, the raw materials for preparing the epoxy primer for the high-speed rail shell include 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 23 parts of pigment, 14 parts of filler, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoamer, 0.7 parts of anti-flash rust additive, and 15.4 parts of deionized water. The preparation method of the epoxy primer for the high-speed rail shell comprises the following steps:

[0085] (1) adding 92 wt % deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0086] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0087] (3) When using, stir and mix the main agent and curing agent.

[0088] Example 8

[0089] Example 8 of the present invention provides an epoxy primer for a high-speed rail shell and a preparation method thereof. The specific implementation method is the same as that of Example 7, except that the aluminum tripolyphosphate is replaced by zinc phosphate ZP-L (Xinsheng). By weight, the raw materials for preparing the epoxy primer for the high-speed rail shell include 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 23 parts of pigment, 14 parts of filler, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoamer, 0.8 parts of anti-flash rust additive, and 16.3 parts of deionized water. The preparation method of epoxy primer for high-speed rail shell comprises the following steps:

[0090] (1) adding 87 wt % of deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0091] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0092] (3) When using, stir and mix the main agent and curing agent.

[0093] Example 9

[0094] Example 9 of the present invention provides an epoxy primer for a high-speed rail shell and a preparation method thereof. The specific implementation method is the same as that of Example 7, except that the aluminum tripolyphosphate is replaced with iron titanium powder HJ808 (Taihe Huijin). By weight, the raw materials for preparing the epoxy primer for the high-speed rail shell include 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 23 parts of pigment, 14 parts of filler, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoamer, 0.7 parts of anti-flash rust additive, and 16.6 parts of deionized water. The preparation method of epoxy primer for a high-speed rail shell comprises the following steps:

[0095] (1) adding 85 wt % of deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0096] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0097] (3) When using, stir and mix the main agent and curing agent.

[0098] Example 10

[0099] Embodiment 10 of the present invention provides an epoxy primer for a high-speed rail shell and a preparation method thereof. The specific implementation method is the same as that of Embodiment 1, except that, by weight, the raw materials for preparing the epoxy primer for the high-speed rail shell include 45 parts of epoxy emulsion, 5 parts of epoxy curing agent, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoamer, 0.7 parts of anti-flash rust additive, and 53.8 parts of deionized water. The preparation method of the epoxy primer for the high-speed rail shell comprises the following steps:

[0100] (1) adding 96 wt % deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0101] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0102] (3) When using, stir and mix the main agent and curing agent.

[0103] Embodiment 11

[0104] Embodiment 11 of the present invention provides an epoxy primer for high-speed rail shell and a preparation method thereof. The specific implementation method is the same as that of Embodiment 10, except that, by weight, the raw materials for preparing the epoxy primer for high-speed rail shell include 45 parts of epoxy emulsion, 15 parts of epoxy curing agent, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoaming agent, 0.8 parts of anti-flash rust additive, and 53.7 parts of deionized water. The epoxy emulsion is replaced by double bond DB4254, and the epoxy curing agent is replaced by double bond DB4812. The preparation method of epoxy primer for high-speed rail shell comprises the following steps:

[0105] (1) adding 96 wt % deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0106] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0107] (3) When using, stir and mix the main agent and curing agent.

[0108] Example 12

[0109] Embodiment 12 of the present invention provides an epoxy primer for a high-speed rail shell and a preparation method thereof. The specific implementation method is the same as that of Embodiment 10, except that, by weight, the raw materials for preparing the epoxy primer for the high-speed rail shell include 45 parts of epoxy emulsion, 7 parts of epoxy curing agent, 4 parts of solvent, 0.5 parts of thickener, 0.2 parts of wetting agent, 1 part of dispersant, 0.2 parts of defoaming agent, 0.7 parts of anti-flash rust additive, and 52.8 parts of deionized water. The epoxy emulsion is replaced by Fuqisen AQUAER-3011, and the epoxy curing agent is replaced by Fuqisen AQUAEPO-3126. The preparation method of epoxy primer for a high-speed rail shell comprises the following steps:

[0110] (1) adding 98 wt % deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0111] (2) adding epoxy emulsion under stirring, stirring and mixing, adding 50wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water and the anti-flash rust additive to obtain a curing agent.

[0112] (3) When using, stir and mix the main agent and curing agent.

[0113] Performance Testing

[0114] The primers provided in Examples 1-12 of the present invention were subjected to stability, adhesion and salt spray resistance tests. The test methods are as follows. The test results are shown in Table 1.

[0115] 1. Stability: Referring to GB / T 6753.3, the stability test was performed on the primers provided in Examples 1-12.

[0116] 2. Adhesion: Refer to GB / T 5210 to test pull-off adhesion, coating thickness is 65±5μm.

[0117] 3. Salt spray resistance: An environmental test that uses artificial simulated salt spray environmental conditions created by salt spray test equipment to assess the corrosion resistance of products or metal materials. It is usually carried out in a salt spray test chamber, which is equipped with a spray system, a heating system, and a control system. Apply the epoxy thick paste paint provided in Examples 1-15 to the test plate to obtain a coating test plate with a coating thickness of 65±5μm. Ensure that the coating is completely dry, use a 5wt% sodium chloride aqueous solution as a salt spray source, and add it to the spray tower. According to the test requirements, set the spray time, temperature, humidity and other parameters according to GBT1771. Place the test plate in a salt spray test chamber, start the spray system, and allow the salt spray to fully cover the sample. Judge the test results according to GBT1766.

[0118] Table 1

[0119]

[0120]

Claims

1. An epoxy primer for high-speed rail shell, characterized in that: The raw materials include at least 40-50 parts of epoxy emulsion, 5-15 parts of epoxy curing agent, 15-30 parts of pigment, 5-20 parts of filler, 1-5 parts of solvent, 0.1-1 parts of thickener, 0.1-0.5 parts of wetting agent, 0.1-2 parts of dispersant, 0.1-0.5 parts of defoaming agent, 0.1-1 parts of anti-flash rust additive, 0.1-2 parts of adhesion promoter, 0.1-0.5 parts of anti-sagging additive and 10-60 parts of deionized water.

2. The epoxy primer for high-speed railway shell according to claim 1, characterized in that: The epoxy emulsion is a water-based epoxy resin emulsion, the viscosity of the water-based epoxy resin emulsion at 25° C. is 400-8000 mPa·s, and the epoxy equivalent of the water-based epoxy resin emulsion is 400-1200 g / mol.

3. The epoxy primer for high-speed railway shell according to claim 2, characterized in that: The epoxy curing agent is a modified amine epoxy curing agent.

4. The epoxy primer for high-speed railway shell according to claim 3, characterized in that: The viscosity of the modified amine epoxy curing agent at 25° C. is 4000-40000 mPa·s, and the active hydrogen equivalent of the modified amine epoxy curing agent is 100-200 g / mol.

5. The epoxy primer for high-speed railway shell according to claim 4, characterized in that: The dispersant is selected from at least one of Digo 755W, Bi Ke 190 and Digo 760W.

6. The epoxy primer for high-speed railway shell according to claim 5, characterized in that: The pigment includes at least an anti-rust pigment.

7. The epoxy primer for high-speed railway shell according to claim 6, characterized in that: The anti-rust pigment is selected from at least one of iron titanium powder, zinc phosphate and aluminum tripolyphosphate.

8. The epoxy primer for high-speed railway shell according to claim 7, characterized in that: The filler is selected from at least one of talc, barium sulfate and calcium carbonate.

9. The epoxy primer for high-speed railway shell according to claim 8, characterized in that: The adhesion promoter is selected from at least one of MP200, KH560 and CM-8011.

10. A method for preparing an epoxy primer for a high-speed railway shell according to any one of claims 1 to 9, characterized in that: At least the following steps are included: (1) adding 80-99 wt % deionized water into a container, adding a dispersant and a defoamer under stirring and dispersing, then adding a pigment and an anti-sagging agent and stirring and mixing, then adding a filler and stirring and dispersing to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm; (2) adding epoxy emulsion under stirring, stirring and mixing, adding 40-60wt% solvent, wetting agent, adhesion promoter, thickener and stirring and mixing to obtain a main agent; stirring and mixing the epoxy curing agent, the remaining solvent, the remaining deionized water, and the anti-flash rust additive to obtain a curing agent; (3) When using, stir and mix the main agent and curing agent.

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