A water-based epoxy high build paint for rail transit bogies and preparation method thereof

Abstract

The present invention relates to the field of coating technology, and specifically relates to a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The preparation raw materials include, by weight, at least 50-60 parts of an aqueous emulsion, 8-12 parts of a water-based curing agent, 10-40 parts of a powder, 1-10 parts of an alcohol ether, 1-8 parts of an additive, and 5-50 parts of deionized water. By optimizing the product formula system, the provided high-build paint has excellent anti-sagging performance. While ensuring construction, the paint film has excellent acid, alkali and salt spray resistance, thereby better meeting the actual application requirements of high-speed rail bogies and other components.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, in particular to a water-based epoxy high build paint for rail transit bogies and a preparation method thereof. Background Art

[0002] High-speed railways are an important symbol of the integration of high-tech and railway modernization in today's era, reflecting a country's comprehensive national strength. my country has a vast territory, and high-speed rail vehicles have long operating mileage, involving complex and changeable environmental conditions, which can easily lead to coating damage. Existing ordinary acrylic polyurethane topcoats have poor thick coating performance. After long-term operation, the vehicle frame, axles, and wheel hubs are susceptible to stone impact, foreign body friction, and oil corrosion, with the risk of paint film wear and shedding, causing rust on the frame, axles, and wheel hubs, etc., posing a huge safety hazard to the operation of the vehicle. Current water-based high-build paints are prone to sagging during actual construction. For example, a Chinese patent (authorization publication number CN116478594B) discloses a high-performance water-based epoxy frame high-build paint and its preparation method and application. By optimizing the product formulation system, the provided product can be applied thickly to 200μm without cavitation and has a salt spray resistance of up to 1000 hours or more. However, both the anti-sagging performance and salt spray resistance performance need to be further improved. The iron bogie is a particularly important component of high-speed trains. Its main task is to support the carriages and connect the wheelsets to ensure the stable operation of the train on the track. The frame serves as the basic framework of the bogie, supporting and fixing other components, while the load-bearing beam is responsible for bearing the weight of the wheels and carriages, while ensuring normal contact between the wheels and the track, thereby ensuring the smooth operation of the train. In addition, components such as torsion bars, gear sets, and lubrication systems also play a vital role in high-speed rail bogies. Together, they ensure the stability of the train and ride comfort. The bogie coating has very high requirements for salt spray resistance, acid and alkali resistance, and also has very high construction requirements. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a water-based epoxy high-build paint for rail transit bogies. By optimizing the product formula system, the provided high-build paint has excellent anti-sagging performance. While ensuring construction, the paint film has excellent acid, alkali and salt spray resistance, meets environmental protection requirements, and better meets the actual application needs of high-speed rail bogies and other components.

[0004] On one hand, the present invention provides a water-based epoxy high-build paint for rail transit bogies. The raw materials for its preparation include, by weight, at least 50-60 parts of water-based emulsion, 8-12 parts of water-based curing agent, 10-40 parts of powder, 1-10 parts of alcohol ether, 1-8 parts of additives, and 5-50 parts of deionized water.

[0005] As a preferred technical solution, the aqueous emulsion at least includes aqueous epoxy emulsion.

[0006] Preferably, the water-based epoxy emulsion is selected from at least one of Qirun EP137, QR E-pos1015W, Fuqisen AQUAER-3012, and Yihua Gaoke ME3200, preferably QR E-pos1015W.

[0007] As a preferred technical solution, the water-based curing agent is a water-based amine epoxy adduct.

[0008] Preferably, the viscosity of the waterborne amine epoxy adduct at 23° C. is 10,000-30,000 mPa·s, preferably 18,000-23,000 mPa·s.

[0009] Preferably, the amine value of the waterborne amine epoxy adduct is 150-250 mgKOH / g, preferably 170-220 mgKOH / g.

[0010] Most preferably, the waterborne amine epoxy adduct is R-RIT 1071 (QR-Polymers, Netherlands).

[0011] As a preferred technical solution, the powder includes at least carbon black, titanium dioxide, barium sulfate, and silicon dioxide.

[0012] Preferably, the mass ratio of the carbon black, titanium dioxide, barium sulfate and silicon dioxide is 0.1:(10-20):(5-15):(1-8), preferably 0.1:(10-20):10:5, and most preferably 0.1:15:10:5.

[0013] Preferably, the particle size of the carbon black is 20-100 nm, preferably 20-50 nm, and most preferably Mitsubishi MA100.

[0014] Preferably, the titanium dioxide is rutile titanium dioxide, and the most preferred is Longbai R996.

[0015] Preferably, the particle size of the barium sulfate is 1-10 μm, preferably 2-2.4 μm, and most preferably Jiaoling BS-115.

[0016] Preferably, the silica is ion-exchanged silica, and the particle size of the ion-exchanged silica is 1-10 μm, preferably 2.5-3.8 μm, and most preferably GRACE C303 silica.

[0017] As a preferred technical solution, the additives include at least 0.1-1 parts of thickener, 0.1-0.5 parts of wetting agent, 1-3 parts of dispersant, 0.1-0.5 parts of defoamer, 0.1-0.5 parts of leveling agent, 1-3 parts of adhesion promoter, and 0.5-1.5 parts of anti-sagging agent.

[0018] As a preferred technical solution, the dispersant is selected from Digo 755W, Efcona 6208-60, Solsperse TM At least one of 27000C, preferably a combination of Digo 755W and Efcona 6208-60.

[0019] Preferably, the mass ratio of Digo 755W to Efcona 6208-60 is 1:(0.5-2), preferably 1:1.

[0020] As a preferred technical solution, the defoaming agent includes at least Digo 810 and Digo 901W.

[0021] Preferably, the mass ratio of Digo 810 to Digo 901W is (0.8-1.8):1, preferably 1:1.

[0022] As a preferred technical solution, the leveling agent includes at least TEGO Glide 100.

[0023] As a preferred technical solution, the anti-sagging agent is selected from at least one of bentonite, cellulose, and lithium magnesium silicate, preferably a combination of bentonite and cellulose.

[0024] Preferably, the mass ratio of the bentonite to the cellulose is (0.5-2):1, preferably 1:1.

[0025] As a preferred technical solution, the adhesion promoter includes at least Maitu MP200 and Qingtian DH-7269s;

[0026] Preferably, the mass ratio of the Maitu MP200 to the Qingtian DH-7269s is 1:(0.8-1.5), preferably 1:1.

[0027] As a preferred technical solution, the alcohol ether is selected from at least one of propylene glycol methyl ether, dipropylene glycol butyl ether, and dipropylene glycol methyl ether, preferably propylene glycol methyl ether.

[0028] As a preferred technical solution, the wetting agent includes at least Digo 4100.

[0029] As a preferred technical solution, the thickener includes at least ACRYSOL TM RM-12W.

[0030] The present invention utilizes QR E-POS1015W water-based epoxy emulsion, formulated with a water-based amine-epoxy adduct having an amine value of 150-250 mgKOH / g and a viscosity of 10,000-30,000 mPa·s at 23°C, resulting in a cured paint film with excellent processability, salt spray resistance, and acid and alkali resistance. In particular, the introduction of calcium ion-exchanged silica pigment allows the silica carrier to slightly dissolve in a corrosive environment, forming an iron silicate passivation film that prevents further corrosion. The calcium ions can also exchange with the corrosive ions, reducing attack on the substrate while simultaneously producing calcium-iron silicate to form a protective film. Furthermore, by optimizing the selection of anti-sagging agents in the system, particularly the simultaneous introduction of bentonite and cellulose, the product's anti-sagging properties are effectively improved. Furthermore, by optimizing the selection and combination of dispersants, defoamers, and adhesion promoters in the system, the provided product can be applied thickly to at least 300 μm without cavitation and has a salt spray resistance of 1,500 hours or more.

[0031] On the other hand, the present invention provides a method for preparing a water-based epoxy high-build paint for rail transit bogies, which comprises at least the following steps: adding deionized water and an additive into a container and stirring and mixing, then adding a powder, stirring and mixing, and grinding to a fineness of less than 20 μm, then adding an aqueous emulsion while stirring, stirring and mixing to obtain component A, stirring and mixing an alcohol ether and a water-based curing agent to obtain component B, and stirring and mixing component A and component B when in use.

[0032] The epoxy high build paint provided by the present invention can meet the thick coating application requirements of the surface of high-speed rail parts, reduce the risk of paint film wear and peeling after long-term operation of the vehicle, reduce the safety hazards of vehicle operation to a certain extent, and has high market application and promotion value.

[0033] Beneficial effects

[0034] 1. The present invention provides a water-based epoxy high-build paint for rail transit bogies. By optimizing the product formula system, the high-build paint has excellent anti-sagging performance. While ensuring construction, the paint film has excellent acid, alkali and salt spray resistance, meets environmental protection requirements, and better meets the actual application needs of high-speed rail bogies and other components.

[0035] 2. The present invention adopts QR E-pos1015W water-based epoxy emulsion, which is matched with a water-based amine epoxy adduct with an amine value of 150-250 mgKOH / g and a viscosity of 10,000-30,000 mPa·s at 23°C, so that the cured paint film has good processing performance, salt spray resistance and acid and alkali resistance.

[0036] 3. The present invention effectively improves the anti-sagging performance of the product by optimizing the selection of anti-sagging additives in the system, especially by introducing bentonite and cellulose at the same time.

[0037] 4. The high build paint provided by the present invention optimizes the selection and combination of dispersants, defoamers and adhesion promoters in the system, so that the provided product can be applied thickly to at least 300 μm without cavitation and has a salt spray resistance of up to 1500 hours or more.

[0038] 5. The epoxy high build paint provided by the present invention can meet the thick coating application requirements of the surface of high-speed rail parts, reduce the risk of paint film wear and peeling after long-term operation of the vehicle, reduce the safety hazards of vehicle operation to a certain extent, and has high market application and promotion value. DETAILED DESCRIPTION

[0039] Example 1

[0040] On the one hand, Example 1 of the present invention provides a water-based epoxy high-build paint for rail transit bogies. The raw materials for preparation include, by weight, 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ether, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.4 parts of defoaming agent, 0.2 parts of leveling agent, 2 parts of adhesion promoter, 1 part of anti-sagging agent, and 6.1 parts of deionized water.

[0041] The aqueous emulsion is an aqueous epoxy emulsion, and the aqueous epoxy emulsion is QR E-pos1015W.

[0042] The waterborne curing agent is a waterborne amine epoxy adduct, the viscosity of the waterborne amine epoxy adduct at 23° C. is 18,000-23,000 mPa·s, the amine value of the waterborne amine epoxy adduct is 170-220 mgKOH / g, and the model of the waterborne amine epoxy adduct is R-RIT 1071 (QR-Polymers, the Netherlands).

[0043] The powder is a combination of carbon black, titanium dioxide, barium sulfate and silicon dioxide, and the mass ratio of the carbon black, titanium dioxide, barium sulfate and silicon dioxide is 0.1:15:10:5.

[0044] The particle size of the carbon black is 20-50 nm, and the model is Mitsubishi MA100.

[0045] The titanium dioxide is rutile titanium dioxide, and its model is Longbai R996.

[0046] The particle size of the barium sulfate is 2-2.4 μm, and the model is Jiaoling BS-115.

[0047] The silica is ion-exchanged silica with a particle size of 2.5-3.8 μm and a model of GRACE. C303 silica.

[0048] The dispersant is a combination of Tego 755W and Efcona 6208-60, and the mass ratio of Tego 755W to Efcona 6208-60 is 1:1.

[0049] The defoaming agent is a combination of Digo 810 and Digo 901W, and the mass ratio of Digo 810 to Digo 901W is 1:1.

[0050] The leveling agent is TEGO Glide 100.

[0051] The anti-sagging agent is a combination of bentonite and cellulose, with the mass ratio of the bentonite to the cellulose being 1:1. The bentonite is Hemmings BENTONE LT and the cellulose is Ashland Natrosol. TM Plus 330.

[0052] The adhesion promoter is a combination of Maitu MP200 and Qingtian DH-7269s, and the mass ratio of Maitu MP200 and Qingtian DH-7269s is 1:1.

[0053] The alcohol ether is propylene glycol methyl ether.

[0054] The wetting agent is Digo 4100.

[0055] The thickener is ACRYSOL TM RM-12W.

[0056] On the other hand, embodiment 1 of the present invention provides a method for preparing a water-based epoxy high build paint for rail transit bogies, comprising the following steps:

[0057] (1) Deionized water is added to a stirred tank, and a dispersant and a defoamer are added and stirred and dispersed at a stirring speed of 300 r / min. Then, a powder and an anti-sagging agent are added and stirred and dispersed to obtain a mixed material, and the mixed material is ground to a fineness of less than 20 μm;

[0058] (2) adding the aqueous emulsion at a stirring speed of 300 r / min, stirring and mixing, and then adding 33 wt% of alcohol ether, a wetting agent, a leveling agent, an adhesion promoter, and a thickener at a stirring speed of 500 r / min, stirring and mixing to obtain component A;

[0059] (3) The remaining alcohol ethers and the water-based curing agent are stirred and mixed to obtain component B. When used, component A and component B are stirred and mixed to obtain the product.

[0060] Example 2

[0061] Example 2 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, 1 part of adhesion promoter, 1 part of anti-sagging agent, and 7.3 parts of deionized water. The defoaming agent is replaced by Digo 901W, and the adhesion promoter is replaced by Maitu MP200.

[0062] Example 3

[0063] Example 3 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, 1 part of anti-sagging agent, and 8.3 parts of deionized water, and the defoaming agent is replaced by Digao 810.

[0064] Example 4

[0065] Example 4 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, 1 part of anti-sagging agent, and 8.3 parts of deionized water, and the defoaming agent is replaced by Digo 810; the powder is replaced by a combination of carbon black, titanium dioxide, and barium sulfate, and the mass ratio of the carbon black, titanium dioxide, and barium sulfate is 0.1:15:15.

[0066] Example 5

[0067] Example 5 of the present invention provides a water-based epoxy high build paint for rail transit bogies 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 water-based epoxy high build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoamer, 0.2 parts of leveling agent, 1 part of anti-sagging agent, and 8.3 parts of deionized water. The defoamer is replaced by Digo 810; the dispersant is replaced by SolsperseTM 27000C; the powder is replaced by a combination of carbon black, titanium dioxide and barium sulfate, and the mass ratio of the carbon black, titanium dioxide and barium sulfate is 0.1:15:15.

[0068] Example 6

[0069] Example 6 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, 1 part of anti-sagging agent, and 8.3 parts of deionized water. The defoaming agent is replaced by Digo 810; the dispersant is replaced by Efcona 6208-60; the powder is replaced by a combination of carbon black, titanium dioxide, and barium sulfate, and the mass ratio of the carbon black, titanium dioxide, and barium sulfate is 0.1:15:15.

[0070] Example 7

[0071] Example 7 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, 1 part of anti-sagging agent, and 8.3 parts of deionized water. The defoaming agent is replaced by Digo 810; the dispersant is replaced by Digo 755W; the powder is replaced by a combination of carbon black, titanium dioxide, and barium sulfate, and the mass ratio of the carbon black, titanium dioxide, and barium sulfate is 0.1:15:15.

[0072] Example 8

[0073] Example 8 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, 1 part of anti-sagging agent, and 8.3 parts of deionized water. The defoaming agent is replaced by Digo 810; the dispersant is replaced by Digo 755W; the powder is replaced by a combination of carbon black, titanium dioxide, and barium sulfate, and the mass ratio of the carbon black, titanium dioxide, and barium sulfate is 0.1:15:15.

[0074] Example 9

[0075] Example 9 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1. The raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include, by weight: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, 0.3 parts of anti-sagging agent, and 9 parts of deionized water. The defoaming agent is replaced by Digo 810; the dispersant is replaced by Digo 755W; the anti-sagging agent is replaced by lithium magnesium silicate (LUVOGEL-W2N); the powder is replaced by a combination of carbon black, titanium dioxide, and barium sulfate, and the mass ratio of carbon black, titanium dioxide, and barium sulfate is 0.1:15:15.

[0076] Example 10

[0077] Example 10 of the present invention provides a water-based epoxy high build paint for rail transit bogies 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 water-based epoxy high build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoamer, 0.2 parts of leveling agent, 0.3 parts of anti-sagging agent, and 9 parts of deionized water. The defoamer is replaced by Digo 810; the dispersant is replaced by Digo 755W; the anti-sagging agent is replaced by Ashland Natrosol TM Plus 330; the powder is replaced by a combination of carbon black, titanium dioxide, and barium sulfate, and the mass ratio of the carbon black, titanium dioxide, and barium sulfate is 0.1:15:15.

[0078] Example 11

[0079] Example 11 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 30.1 parts of powder, 7.5 parts of alcohol ether, 0.5 part of thickener, 0.2 part of wetting agent, 2 parts of dispersant, 0.2 part of defoaming agent, 0.2 part of leveling agent, 0.3 part of anti-sagging agent, and 9 parts of deionized water, the defoaming agent is replaced by Digo 810; the dispersant is replaced by Digo 755W; the anti-sagging agent is replaced by Hemmings BENTONE LT; the powder is replaced by a combination of carbon black, titanium dioxide, and barium sulfate, and the mass ratio of the carbon black, titanium dioxide, and barium sulfate is 0.1:15:15.

[0080] Example 12

[0081] Example 12 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 10 parts of aqueous curing agent, 7.5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, and 39.4 parts of deionized water. The defoaming agent is replaced by Digo 810; the dispersant is replaced by Digo 755W.

[0082] Example 13

[0083] Example 13 of the present invention provides a water-based epoxy high build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 12, except that, by weight, the raw materials for preparing the water-based epoxy high build paint for rail transit bogies include: 55 parts of aqueous emulsion, 6.5 parts of aqueous curing agent, 6 parts of alcohol ether, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoamer, 0.2 parts of leveling agent, and 39.4 parts of deionized water. The aqueous emulsion is replaced by Qirun EP137, and the aqueous amine is replaced by Qirun EH3504. The preparation method of the water-based epoxy high build paint for rail transit bogies comprises the following steps:

[0084] (1) Deionized water is added to a stirred tank, and a dispersant and a defoamer are added and stirred and dispersed at a stirring speed of 300 r / min. Then, a powder and an anti-sagging agent are added and stirred and dispersed to obtain a mixed material, and the mixed material is ground to a fineness of less than 20 μm;

[0085] (2) adding the aqueous emulsion at a stirring speed of 300 r / min, stirring and mixing, and then adding 42 wt% of alcohol ether, a wetting agent, a leveling agent, an adhesion promoter, and a thickener at a stirring speed of 500 r / min, stirring and mixing to obtain component A;

[0086] (3) The remaining alcohol ethers and the water-based curing agent are stirred and mixed to obtain component B. When used, component A and component B are stirred and mixed to obtain the product.

[0087] Example 14

[0088] Example 14 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 12, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 12.5 parts of aqueous curing agent, 5 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, and 39.4 parts of deionized water. The aqueous emulsion is replaced by Fuqisen AQUAER-3012, and the aqueous amine is replaced by Fuqisen AQUAEPO-3100.

[0089] The preparation method of the water-based epoxy high build paint for rail transit bogies comprises the following steps:

[0090] (1) Deionized water is added to a stirred tank, and a dispersant and a defoamer are added and stirred and dispersed at a stirring speed of 300 r / min. Then, a powder and an anti-sagging agent are added and stirred and dispersed to obtain a mixed material, and the mixed material is ground to a fineness of less than 20 μm;

[0091] (2) adding the aqueous emulsion at a stirring speed of 300 r / min, stirring and mixing, and then adding 50 wt% of alcohol ether, a wetting agent, a leveling agent, an adhesion promoter, and a thickener at a stirring speed of 500 r / min, stirring and mixing to obtain component A;

[0092] (3) The remaining alcohol ethers and the water-based curing agent are stirred and mixed to obtain component B. When used, component A and component B are stirred and mixed to obtain the product.

[0093] Example 15

[0094] Example 15 of the present invention provides a water-based epoxy high-build paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 12, except that, in parts by weight, the raw materials for preparing the water-based epoxy high-build paint for rail transit bogies include: 55 parts of aqueous emulsion, 6.5 parts of aqueous curing agent, 6 parts of alcohol ethers, 0.5 parts of thickener, 0.2 parts of wetting agent, 2 parts of dispersant, 0.2 parts of defoaming agent, 0.2 parts of leveling agent, and 39.4 parts of deionized water. The aqueous emulsion is replaced by Huagao Ke ME3200, and the aqueous amine is replaced by Huagao Ke MH3900.

[0095] The preparation method of the water-based epoxy high build paint for rail transit bogies comprises the following steps:

[0096] (1) Deionized water is added to a stirred tank, and a dispersant and a defoamer are added and stirred and dispersed at a stirring speed of 300 r / min. Then, a powder and an anti-sagging agent are added and stirred and dispersed to obtain a mixed material, and the mixed material is ground to a fineness of less than 20 μm;

[0097] (2) adding the aqueous emulsion at a stirring speed of 300 r / min, stirring and mixing, and then adding 42 wt% of alcohol ether, a wetting agent, a leveling agent, an adhesion promoter, and a thickener at a stirring speed of 500 r / min, stirring and mixing to obtain component A;

[0098] (3) The remaining alcohol ethers and the water-based curing agent are stirred and mixed to obtain component B. When used, component A and component B are stirred and mixed to obtain the product.

[0099] Performance Testing

[0100] The epoxy high build paints provided in Examples 1-15 of the present invention were subjected to viscosity, sagging, salt spray resistance, and acid and alkali resistance tests. The test methods are as follows. The test results are shown in Table 1.

[0101] 1. Viscosity: The viscosity of the epoxy high build paints provided in Examples 1-15 was tested with reference to GB / T 9269-2009 (Determination of coating viscosity using Stormer viscometer method B, which is a digital viscometer method).

[0102] 2. Sag: Sag refers to the tendency of a wet coating to drip downward due to gravity when applied to a vertical surface. Sag testing helps assess the flow characteristics and adaptability of a coating. Test Method: Sag testing is typically performed using a sag tester. In this test, the epoxy high-build paints provided in Examples 1-15 are applied to a test panel, which is then placed vertically. The sag of the wet coating is observed and recorded.

[0103] 3. Salt spray resistance: An environmental test that uses artificially 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. The epoxy thick paste paint provided in Examples 1-15 is applied to the test plate to obtain a coating test plate with a thickness of 150±20μm. Ensure that the coating is completely dry, and use a 5wt% sodium chloride aqueous solution as a salt spray source, which is added 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 the 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.

[0104] 4. Resistance to 10 wt% aqueous sulfuric acid solution: The epoxy high-build paint provided in Examples 1-15 was applied to a test panel to obtain a coating test panel with a thickness of 150 ± 20 μm. The coating was ensured to be completely dry and the edges were sealed. The coated test panel was immersed in a 10 wt% aqueous sulfuric acid solution at 25°C. The time when changes in the coating surface appeared was recorded as the test result.

[0105] 5. Resistance to 10 wt% sodium hydroxide aqueous solution: The epoxy high-build paint provided in Examples 1-15 was applied to a test panel to obtain a coating test panel with a thickness of 150±20 μm. The coating was ensured to be completely dry and the edges were sealed. The coated test panel was immersed in a 10 wt% sodium hydroxide aqueous solution at 25°C. The time when changes in the coating surface appeared was recorded as the test result.

[0106] Table 1

[0107]

[0108]

Claims

1. A water-based epoxy high build paint for rail transit bogies, characterized in that: The raw materials for the preparation include at least 50-60 parts of aqueous emulsion, 8-12 parts of aqueous curing agent, 10-40 parts of powder, 1-10 parts of alcohol ether, 1-8 parts of auxiliary agent, and 5-50 parts of deionized water. The aqueous curing agent is an aqueous amine epoxy adduct, and the amine value of the aqueous amine epoxy adduct is 150-250 mgKOH / g. The powder includes at least carbon black, titanium dioxide, barium sulfate, and silicon dioxide. The mass ratio of the carbon black, titanium dioxide, barium sulfate, and silicon dioxide is 0.1:(10-20):(5-15):(1-8). The silicon dioxide is ion-exchanged silicon dioxide, and the particle size of the ion-exchanged silicon dioxide is 1-10 μm. The model is GRACE SHIELDEX®. C303 silicon dioxide; the additives include at least 0.1-1 parts of thickener, 0.1-0.5 parts of wetting agent, 1-3 parts of dispersant, 0.1-0.5 parts of defoamer, 0.1-0.5 parts of leveling agent, 1-3 parts of adhesion promoter, and 0.5-1.5 parts of anti-sagging agent; the dispersant is a combination of Digo 755W and Efcona 6208-60, and the mass ratio of Digo 755W and Efcona 6208-60 is 1: (0.5-2); the The defoaming agent includes at least Digo 810 and Digo 901W, and the mass ratio of Digo 810 and Digo 901W is (0.8-1.8):1; the anti-sagging agent is a combination of bentonite and cellulose, and the mass ratio of the bentonite and cellulose is (0.5-2):1; the adhesion promoter includes at least Maitu MP200 and Qingtian DH-7269s, and the mass ratio of Maitu MP200 and Qingtian DH-7269s is 1:(0.8-1.5).

2. The water-based epoxy high build paint for rail transit bogies according to claim 1, characterized in that: The alcohol ethers are selected from at least one of propylene glycol methyl ether, dipropylene glycol butyl ether and dipropylene glycol methyl ether.

3. A method for preparing a water-based epoxy high build paint for rail transit bogies according to any one of claims 1 to 2, characterized in that: At least the following steps are included: Deionized water and additives are added to a container and stirred to mix. Then, powder is added, stirred and mixed, and ground to a fineness of less than 20 μm. Then, aqueous emulsion is added while stirring, and stirred to obtain component A. Alcohol ethers and aqueous curing agents are stirred to obtain component B. When used, components A and B are stirred and mixed.

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