Epoxy primer for high-iron shell and preparation method thereof
By optimizing the epoxy primer formulation, the problems of insufficient adhesion and salt spray resistance of epoxy primers on carbon steel, carbon fiber and fiberglass surfaces in the existing technology have been solved, thus achieving effective protection for high-speed train bodies.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NEWMAT (BEIJING) ENVIRONMENTAL MATERIALS TECH CO LTD
- Filing Date
- 2024-12-17
- Publication Date
- 2026-07-24
AI Technical Summary
Existing epoxy primers have insufficient adhesion and salt spray resistance on carbon steel, carbon fiber and fiberglass surfaces, which cannot meet the protection requirements of high-speed rail bodies.
By optimizing the epoxy primer formulation and selecting appropriate epoxy emulsions, epoxy curing agents, rust-preventive pigments, dispersants, and adhesion promoters, along with other raw materials, excellent adhesion and salt spray resistance to carbon steel, aluminum alloys, carbon fiber, and fiberglass surfaces can be ensured.
It achieves a pull-out adhesion of ≥7MPa and a salt spray resistance of ≥800h on carbon steel and aluminum alloys, and a cross-cut adhesion of ≥7MPa and a salt spray resistance of ≥1500h on carbon fiber and fiberglass surfaces, meeting the protection requirements of high-speed rail bodies.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of epoxy primer technology, specifically to an epoxy primer for high-speed rail shells and its preparation method. Background Technology
[0002] With the development of high-speed rail technology and the country's substantial investment in railway construction, locomotives and rolling stock, as well as high-speed trains, are increasingly used in different regions and harsh environments, leading to ever-increasing demands on their operational performance. Typically, the protective coating for high-speed train bodies consists of epoxy anti-corrosion primer, putty, polyurethane intermediate coat, and polyurethane topcoat, starting from the substrate. Among these, the epoxy anti-corrosion primer is a crucial layer, playing a vital role in connecting the top and bottom layers. If the train's substrate loses the protection of this coating, numerous unpredictable problems and dangers will arise. While current epoxy primers can meet the adhesion and salt spray resistance requirements of aluminum alloys, their adhesion and salt spray resistance to carbon steel, carbon fiber, and fiberglass need further improvement. For example, Chinese patent (authorization announcement number CN107286756B) discloses a low-temperature resistant epoxy anti-corrosion coating, its preparation method, and its application. This coating achieves good adhesion to aluminum alloy surfaces and meets the requirements for low-temperature operating environments, but its adhesion and salt spray resistance to carbon steel, carbon fiber, and fiberglass still require further improvement. Summary of the Invention
[0003] To address the aforementioned issues, this invention provides an epoxy primer for high-speed rail exteriors. By optimizing the product formulation, the provided epoxy primer can simultaneously achieve excellent adhesion and salt spray resistance on carbon steel, aluminum alloy, carbon fiber, and fiberglass surfaces, thus meeting the protection requirements of high-speed rail bodies.
[0004] This invention provides an epoxy primer for high-speed rail outer shells, comprising, by weight, at least 40-50 parts epoxy emulsion, 5-15 parts epoxy curing agent, 15-30 parts pigment, 5-20 parts filler, 1-5 parts solvent, 0.1-1 part thickener, 0.1-0.5 parts wetting agent, 0.1-2 parts dispersant, 0.1-0.5 parts defoamer, 0.1-1 part anti-flash rust additive, 0.1-2 parts adhesion promoter, 0.1-0.5 parts anti-sagging additive, and deionized water to make up the balance.
[0005] As a preferred technical solution, the epoxy emulsion is an aqueous epoxy resin emulsion, and the viscosity of the aqueous epoxy resin emulsion at 25°C is 400-8000 mPa·s, preferably 400-4000 mPa·s.
[0006] Preferably, the epoxy equivalent of the aqueous epoxy resin emulsion is 400-1200 g / mol, and more preferably 460-630 g / mol.
[0007] Most preferably, the aqueous epoxy resin emulsion is of the type Qirun EP137.
[0008] As a preferred technical solution, the epoxy curing agent is a modified amine epoxy curing agent.
[0009] Preferably, the modified amine epoxy curing agent has a viscosity of 4000-40000 mPa·s at 25°C, more preferably 4000-11000 mPa·s.
[0010] Preferably, the active hydrogen equivalent of the modified amine epoxy curing agent is 100-200 g / mol, and more preferably 150 g / mol.
[0011] Most preferably, the modified amine epoxy curing agent is Qirun EH3504.
[0012] As a preferred technical solution, the pigment includes at least 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, with aluminum tripolyphosphate being the most preferred.
[0014] As a preferred technical solution, the pigment also includes at least one of iron oxide red, iron oxide yellow, and titanium dioxide.
[0015] Preferably, the pigments include aluminum tripolyphosphate, iron oxide red, iron oxide yellow, and titanium dioxide.
[0016] The mass ratio of aluminum tripolyphosphate, iron oxide red, iron oxide yellow, 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 1-10μm, preferably 2-2.4μm.
[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 DIGIC 755W, BYK 190, and DIGIC 760W, preferably DIGIC 755W.
[0020] As a preferred technical solution, the defoamer includes at least DIGIC 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 includes at least Hemings LT.
[0023] As a preferred technical solution, the adhesion promoter is selected from at least one of Momentive MP200, Nanjing Silicon Union KH560, and Guangdong Jiaming CM-8011, with Momentive MP200 being the most preferred.
[0024] As a preferred technical solution, the solvent includes at least propylene glycol methyl ether.
[0025] As a preferred technical solution, the wetting agent includes at least DIGIC 4100.
[0026] As a preferred technical solution, the thickener includes at least a hydrophobically modified polyurethane thickener.
[0027] This invention optimizes the selection and combination of epoxy emulsion, epoxy curing agent, rust-preventive pigment, dispersant, and adhesion promoter in the system. Through the combined action of other raw materials in the system, the provided epoxy primer exhibits excellent stability while achieving pull-out adhesion ≥7MPa and salt spray resistance ≥800h on carbon steel and aluminum alloys; and cross-cut adhesion ≥7MPa and salt spray resistance ≥1500h on carbon fiber and fiberglass surfaces. Specifically, it uses 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, combined with 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 and corrosion resistance of the subsequent paint film. Furthermore, by incorporating Tigo 755W as a dispersant, the dispersion of pigments and fillers in the system is improved, ensuring product stability. In addition, during the research process, it was discovered that incorporating Momentive MP200 not only improves product adhesion but also helps enhance its salt spray resistance.
[0028] Another aspect of the present invention provides a method for preparing an epoxy primer for high-speed rail outer shell, comprising at least the following steps:
[0029] (1) Add 80-99wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0030] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 40-60wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0031] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0032] The epoxy primer provided by this invention has readily available raw materials, a simple preparation method, and high production efficiency, making it easy to achieve large-scale industrial production, promotion, and application.
[0033] Beneficial effects
[0034] 1. This invention provides an epoxy primer for high-speed rail outer shells. By optimizing the product formula, the provided epoxy primer can simultaneously achieve excellent adhesion and salt spray resistance on carbon steel, aluminum alloy, carbon fiber and fiberglass surfaces, thus meeting the protection requirements of high-speed rail bodies.
[0035] 2. This invention optimizes the selection and combination of epoxy emulsion, epoxy curing agent, rust-preventive pigment, dispersant, and adhesion promoter in the system. Under the combined action of other raw materials in the system, the provided epoxy primer has excellent stability while achieving pull-out adhesion ≥7MPa and salt spray resistance ≥800h on carbon steel and aluminum alloys; and cross-cut adhesion ≥7MPa and salt spray resistance ≥1500h on carbon fiber and fiberglass surfaces.
[0036] 3. This invention uses 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, combined with 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 and corrosion resistance of the subsequent paint film.
[0037] 4. The primer provided by this invention, by introducing DIG 755W as a dispersant, has a good dispersion effect on pigments and fillers in the system, ensuring the stability of the product.
[0038] 5. The epoxy primer raw materials provided by this invention are readily available, the preparation method is simple, the production efficiency is high, and it is easy to realize large-scale industrial production, promotion and application. Detailed Implementation
[0039] Example 1
[0040] In one aspect, Embodiment 1 of the present invention provides an epoxy primer for the outer shell of a high-speed train. By weight, the raw materials for preparation 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, 1 part of adhesion promoter, 0.3 parts of anti-sagging additive, and 15.3 parts of deionized water.
[0041] The epoxy emulsion is an aqueous epoxy resin emulsion, the viscosity of which at 25°C is 400-4000 mPa·s, the epoxy equivalent of which is 460-630 g / mol, and the type of which is Qirun EP137.
[0042] The epoxy curing agent is a modified amine epoxy curing agent, the viscosity of which at 25°C is 4000-11000 mPa·s, the active hydrogen equivalent of which is 150 g / mol, and the model of which is Qirun EH3504.
[0043] The pigments include aluminum tripolyphosphate (Xinsheng Aluminum Tripolyphosphate MY-O), iron oxide red (Iron Oxide Red S130), iron oxide yellow (Iron Oxide Yellow S313), and titanium dioxide (Longbai R996).
[0044] The mass ratio of aluminum tripolyphosphate, iron oxide red, iron oxide yellow, and titanium dioxide is 14:3:2:10.
[0045] The filler is barium sulfate with a particle size of 2-2.4 μm and is designated as Jiaoling BS-115.
[0046] The dispersant is DIGIC 755W.
[0047] The defoamer is Digo 810.
[0048] The flash rust inhibitor is RB-60.
[0049] The anti-sagging additive is Hemings LT.
[0050] The adhesion promoter is Momentive MP200.
[0051] The solvent is propylene glycol methyl ether.
[0052] The wetting agent is DIG4100.
[0053] The thickener is a hydrophobically modified polyurethane thickener, model ACRYSOL. TM RM-12W (Dow Chemical).
[0054] Another aspect of Embodiment 1 of the present invention provides a method for preparing an epoxy primer for high-speed rail outer shell, comprising the following steps:
[0055] (1) Add 84wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0056] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0057] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0058] Example 2
[0059] Example 2 of this invention provides an epoxy primer for high-speed rail outer shells and its preparation method. The specific implementation is the same as in Example 1, except that, by weight, the raw materials include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 23 parts pigment, 14 parts filler, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.8 parts anti-flash rust additive, 1 part adhesion promoter, 0.3 parts anti-sagging additive, and 15 parts deionized water. The adhesion promoter is replaced with Nanjing Silicon Union KH560. The preparation method of the epoxy primer for high-speed rail outer shells includes the following steps:
[0060] (1) Add 85wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0061] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0062] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0063] Example 3
[0064] Example 3 of this invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation is the same as in Example 1, except that, by weight, the raw materials include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 23 parts pigment, 14 parts filler, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.7 parts anti-flash rust additive, 1 part adhesion promoter, 0.3 parts anti-sagging additive, and 14.1 parts deionized water. The adhesion promoter is replaced with Guangdong Jiaming CM-8011. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0065] (1) Add 91wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0066] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0067] (3) When using, mix the main agent and the curing agent together to obtain the product.
[0068] Example 4
[0069] Example 4 of the present invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation method is the same as in Example 1, except that, by weight, the raw materials for preparing the epoxy primer for high-speed rail shells include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 23 parts pigment, 14 parts filler, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.7 parts flash rust inhibitor, 0.3 parts anti-sagging agent, and 16.3 parts deionized water. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0070] (1) Add 85wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0071] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0072] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0073] Example 5
[0074] Example 5 of the present invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation method is the same as in Example 4, except that the dispersant is replaced with BYK 190. By weight, the raw materials for preparing the epoxy primer for high-speed rail shells include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 23 parts pigment, 14 parts filler, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.8 parts anti-flash rust additive, 0.3 parts anti-sagging additive, and 16 parts deionized water. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0075] (1) Add 86wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0076] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0077] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0078] Example 6
[0079] Example 6 of the present invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation method is the same as in Example 4, except that the dispersant is replaced with Tigo 760W. By weight, the raw materials for preparing the epoxy primer for high-speed rail shells include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 23 parts pigment, 14 parts filler, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.7 parts flash rust inhibitor, 0.3 parts anti-sagging agent, and 15.1 parts deionized water. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0080] (1) Add 91wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0081] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0082] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0083] Example 7
[0084] Example 7 of the present invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation method is the same as in Example 1, except that, by weight, the raw materials for preparing the epoxy primer for high-speed rail shells include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 23 parts pigment, 14 parts filler, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.7 parts anti-flash rust additive, and 15.4 parts deionized water. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0085] (1) Add 92wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0086] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0087] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0088] Example 8
[0089] Example 8 of this invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation is the same as in Example 7, except that the aluminum tripolyphosphate is replaced with zinc phosphate ZP-L (Xinsheng). By weight, the raw materials for preparing the epoxy primer for high-speed rail shells include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 23 parts pigment, 14 parts filler, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.8 parts anti-flash rust additive, and 16.3 parts deionized water. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0090] (1) Add 87wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0091] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0092] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0093] Example 9
[0094] Example 9 of the present invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation method is the same as in 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 high-speed rail shells include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 23 parts pigment, 14 parts filler, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.7 parts anti-flash rust additive, and 16.6 parts deionized water. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0095] (1) Add 85wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0096] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0097] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0098] Example 10
[0099] Example 10 of the present invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation method is the same as in Example 1, except that, by weight, the raw materials for preparing the epoxy primer for high-speed rail shells include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.7 parts anti-flash rust additive, and 53.8 parts deionized water. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0100] (1) Add 96wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0101] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0102] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0103] Example 11
[0104] Example 11 of the present invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation method is the same as that of Example 10, except that, by weight, the raw materials for preparing the epoxy primer for high-speed rail shells include 45 parts epoxy emulsion, 15 parts epoxy curing agent, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.8 parts anti-flash rust additive, and 53.7 parts deionized water. The epoxy emulsion is replaced with double bond DB4254, and the epoxy curing agent is replaced with double bond DB4812. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0105] (1) Add 96wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0106] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0107] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0108] Example 12
[0109] Example 12 of the present invention provides an epoxy primer for high-speed rail shells and its preparation method. The specific implementation method is the same as that of Example 10, except that, by weight, the raw materials for preparing the epoxy primer for high-speed rail shells include 45 parts epoxy emulsion, 7 parts epoxy curing agent, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.7 parts anti-flash rust additive, and 52.8 parts deionized water. The epoxy emulsion is replaced with Fuqisen AQUAER-3011, and the epoxy curing agent is replaced with Fuqisen AQUAEPO-3126. The preparation method of the epoxy primer for high-speed rail shells includes the following steps:
[0110] (1) Add 98wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm;
[0111] (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 50wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent.
[0112] (3) When using, the main agent and the curing agent are stirred and mixed together.
[0113] Performance testing
[0114] The stability, adhesion and salt spray resistance of the primers provided in Examples 1-12 of this invention were tested. The test methods are as follows, and the test results are shown in Table 1.
[0115] 1. Stability: The stability of the primers provided in Examples 1-12 was tested in accordance with GB / T 6753.3.
[0116] 2. Adhesion: Pull-out adhesion was tested according to GB / T 5210, and the coating thickness was 65±5μm.
[0117] 3. Salt Spray Resistance: This is an environmental test that uses artificially simulated salt spray conditions created by salt spray testing equipment to assess the corrosion resistance of products or metallic materials. It is typically conducted in a salt spray test chamber, which is equipped with a spray system, a heating system, and a control system. The epoxy thick-film paint provided in Examples 1-15 is applied to the test plate to obtain a coating test plate with a thickness of 65±5μm. The coating is ensured to be completely dry. A 5wt% sodium chloride aqueous solution is used as the salt spray source and added to the spray tower. According to the test requirements, the spraying time, temperature, humidity, and other parameters are set according to GBT1771. The test plate is placed in the salt spray test chamber, and the spray system is activated to ensure the salt spray fully covers the sample. The test results are evaluated according to GBT1766.
[0118] Table 1
[0119]
[0120]
Claims
1. An epoxy primer for the outer shell of a high-speed train, characterized in that, By weight, the raw materials for preparation include 45 parts epoxy emulsion, 5 parts epoxy curing agent, 23 parts pigment, 14 parts filler, 4 parts solvent, 0.5 parts thickener, 0.2 parts wetting agent, 1 part dispersant, 0.2 parts defoamer, 0.7 parts anti-flash rust additive, 1 part adhesion promoter, 0.3 parts anti-sagging additive, and 15.3 parts deionized water; The epoxy emulsion is an aqueous epoxy resin emulsion, the viscosity of which at 25°C is 400-4000 mPa·s, the epoxy equivalent of which is 460-630 g / mol, and the type of which is Qirun EP137. 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. The pigments include aluminum tripolyphosphate, iron oxide red, iron oxide yellow, and titanium dioxide, wherein the aluminum tripolyphosphate is designated as Xinsheng aluminum tripolyphosphate MY-O, the iron oxide red is designated as iron oxide red Yipin S130, the iron oxide yellow is designated as iron oxide yellow Yipin S313, and the titanium dioxide is designated as Longbai R996. The mass ratio of aluminum tripolyphosphate, iron oxide red, iron oxide yellow, and titanium dioxide is 14:3:2:10; The filler is barium sulfate with a particle size of 2-2.4 μm and is designated as Jiaoling BS-115. The dispersant is Tigo 755W; The defoamer is Tigo 810; The flash rust inhibitor is RB-60; The anti-sagging additive is Hemings LT; The adhesion promoter is Momentive MP200; The solvent is propylene glycol methyl ether; The wetting agent is Tigo 4100; The thickener is a hydrophobically modified polyurethane thickener, model ACRYSOL™ RM-12W.
2. A method for preparing an epoxy primer for high-speed rail outer shell according to claim 1, characterized in that, At least the following steps are included: (1) Add 80-99wt% deionized water to a container, add dispersant and defoamer while stirring and disperse, then add pigment and anti-sagging agent and stir to mix, then add filler and stir to disperse to obtain a mixture, and grind the mixture to a fineness of <20μm; (2) Add epoxy emulsion under stirring, and after stirring and mixing, add 40-60wt% solvent, wetting agent, adhesion promoter and thickener and stir and mix to obtain the main agent; then stir and mix epoxy curing agent, the remaining solvent, the remaining deionized water and anti-flash rust additive to obtain the curing agent. (3) When using, the main agent and the curing agent are stirred and mixed together.