Water-based epoxy paste paint for rail transit bogie and preparation method of water-based epoxy paste paint

Abstract

The invention relates to the technical field of coatings, in particular to a waterborne epoxy paste paint for a rail transit bogie and a preparation method thereof.The waterborne epoxy paste paint at least comprises, by weight, 50-60 parts of waterborne emulsion, 8-12 parts of waterborne curing agents, 10-40 parts of powder, 1-10 parts of alcohol ethers, 1-8 parts of auxiliaries and 5-50 parts of deionized water. The provided thick paste paint has excellent anti-sagging performance, a paint film has excellent acid and alkali resistance and salt spray resistance under the condition that construction is guaranteed, and the actual application requirements of parts such as high-speed rail bogies and the like are better met.

Description

Technical Field

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

[0002] High-speed railway is an important symbol of the integration of high-tech and railway modernization in the current era, reflecting the comprehensive national strength of a country. my country has a vast territory, and high-speed rail vehicles have a long mileage, involving complex and changeable environmental conditions, which are easy to cause coating damage. The existing ordinary acrylic polyurethane topcoat has poor thick coating performance. After the vehicle runs for a long time, the vehicle frame, axle and wheel hub are susceptible to stone impact, foreign body friction and oil pollution erosion, and there is a risk of paint film wear and fall off, causing rust on the frame, axle and wheel hub, etc., which poses a huge safety hazard to the operation of the vehicle. The current water-based thick paste paint is prone to sagging during actual construction. For example, a Chinese patent (authorization announcement number is CN116478594B) discloses a high-performance water-based epoxy frame thick paste paint and its preparation method and application. By optimizing the product formula system, the provided product can be thickly coated to 200μm without cavitation, and the salt spray resistance can reach 1000 hours or more, but 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 wheels to ensure the stable running of the train on the track. The frame, as the basic framework of the bogie, supports and fixes other components, while the load-bearing beam is responsible for bearing the weight of the wheels and carriages, while ensuring the normal contact between the wheels and the track, thereby ensuring the smooth running 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 and ride comfort of the train. The bogie coating has high requirements for salt spray resistance, acid and alkali resistance, and also has high requirements in terms of construction. 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 the one hand, the present invention provides a water-based epoxy high build paint for rail transit bogies. The raw materials for its preparation include 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 auxiliary agent and 5-50 parts of deionized water, calculated by weight.

[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 High-Tech 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 of model 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 Dego 810 and Dego 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 aid 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 bentonite to 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 and 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 adopts QR E-pos1015W water-based epoxy emulsion, and is matched with an aqueous amine epoxy adduct with an amine value of 150-250 mgKOH / g and a viscosity of 10000-30000 mPa·s at 23°C, so that the cured paint film has good processing performance, salt spray resistance and acid and alkali resistance. In particular, the introduction of calcium ion exchange silica pigment is matched, and the silica carrier is slightly dissolved in a corrosive environment to form an iron silicate passivation film to prevent further corrosion; and the calcium ions can exchange with the corrosive ions to reduce the attack on the substrate, and at the same time produce calcium-iron silicate to form a protective film. Further, by optimizing the selection of anti-sagging aids in the system, especially by introducing bentonite and cellulose at the same time, the anti-sagging performance of the product is effectively improved. Further, by optimizing the selection and matching of dispersants, defoamers and adhesion promoters in the system, the provided product can be thickly coated to at least 300 μm without cavitation, and the salt spray resistance can reach 1500 hours or more.

[0031] On the other hand, the present invention provides a method for preparing a water-based epoxy high-paste 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 alcohol ethers 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 on the surface of high-speed rail parts, reduce the risk of paint film wear and shedding after long-term operation of the vehicle, reduce the safety hazards of vehicle operation to a certain extent, and has a 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 10000-30000 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 the anti-sagging aid in the system, especially by introducing bentonite and cellulose at the same time.

[0037] 4. The high paste 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 the salt spray resistance can reach 1500 hours or more.

[0038] 5. The epoxy high build paint provided by the present invention can meet the thick coating application requirements on 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 a high market application and promotion value. DETAILED DESCRIPTION

[0039] Example 1

[0040] Embodiment 1 of the present invention provides, on the one hand, a water-based epoxy high-paste 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 ethers, 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 water-based curing agent is a water-based amine epoxy adduct, the viscosity of the water-based amine epoxy adduct at 23° C. is 18000-23000 mPa·s, the amine value of the water-based amine epoxy adduct is 170-220 mgKOH / g, and the model of the water-based amine epoxy adduct is R-RIT 1071 (QR-Polymers, 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, the particle size of which is 2.5-3.8 μm, and the model is GRACE C303 Silica.

[0048] The dispersant is a combination of Digo 755W and Efcona 6208-60, and the mass ratio of Digo 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, and the mass ratio of the bentonite to the cellulose is 1:1. The model of the bentonite is Hemmings BENTONE LT, and the model of 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] Embodiment 1 of the present invention provides, on the other hand, a method for preparing a water-based epoxy high build paint for rail transit bogies, comprising the following steps:

[0057] (1) adding deionized water into a stirring kettle, adding a dispersant and a defoamer at a stirring speed of 300 r / min, stirring and dispersing, and then adding a powder and an anti-sagging agent to stir and disperse to obtain a mixed material, and grinding the mixed material 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 ether 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 mastic 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 mastic 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 Digo 810.

[0064] Example 4

[0065] Example 4 of the present invention provides a water-based epoxy thick paste 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 thick paste 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 thick paste 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 thick paste 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, 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 thick paste 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 thick paste 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 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 thick paste 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 thick paste 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 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 thick paste 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 thick paste 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 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 thick paste paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Example 1. In parts by weight, the raw materials for preparing the water-based epoxy thick paste 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, 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 the carbon black, titanium dioxide, and barium sulfate is 0.1:15:15.

[0076] Example 10

[0077] Embodiment 10 of the present invention provides a water-based epoxy thick paste paint for rail transit bogies 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 water-based epoxy thick paste 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, wherein 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] Embodiment 11

[0079] Embodiment 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 Embodiment 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, 0.3 parts of anti-sagging agent, and 9 parts of deionized water, wherein 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 mastic 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 mastic 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, and the defoaming agent is replaced by Digo 810; the dispersant is replaced by Digo 755W.

[0082] Embodiment 13

[0083] Embodiment 13 of the present invention provides a water-based epoxy thick paste paint for rail transit bogies and a preparation method thereof. The specific implementation method is the same as that of Embodiment 12, except that, by weight, the raw materials for preparing the water-based epoxy thick paste paint for rail transit bogies include: 55 parts of water-based emulsion, 6.5 parts of water-based 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 defoamer, 0.2 parts of leveling agent, 39.4 parts of deionized water, the water-based emulsion is replaced by Qirun EP137, and the water-based amine is replaced by Qirun EH3504. The preparation method of the water-based epoxy thick paste paint for rail transit bogies comprises the following steps:

[0084] (1) adding deionized water into a stirring kettle, adding a dispersant and a defoamer at a stirring speed of 300 r / min, stirring and dispersing, and then adding a powder and an anti-sagging agent to stir and disperse to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0085] (2) adding an 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 ether 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] Embodiment 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) adding deionized water into a stirring kettle, adding a dispersant and a defoamer at a stirring speed of 300 r / min, stirring and dispersing, and then adding a powder and an anti-sagging agent to stir and disperse to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0091] (2) adding an aqueous emulsion at a stirring speed of 300 r / min, stirring and mixing, and then adding 50 wt % of an 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 ether 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] Embodiment 15

[0094] Example 15 of the present invention provides a water-based epoxy mastic 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 mastic 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 Chemical High-Tech ME3200, and the aqueous amine is replaced by Chemical High-Tech MH3900.

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

[0096] (1) adding deionized water into a stirring kettle, adding a dispersant and a defoamer at a stirring speed of 300 r / min, stirring and dispersing, and then adding a powder and an anti-sagging agent to stir and disperse to obtain a mixed material, and grinding the mixed material to a fineness of less than 20 μm;

[0097] (2) adding an 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 ether 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 paint provided in Examples 1-15 of the present invention was 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 mastic paints provided in Examples 1-15 was tested with reference to GB / T 9269-2009 (Determination of coating viscosity by Stormer viscometer method-Method B is a digital viscometer method).

[0102] 2. Sagging: Sagging refers to the phenomenon that the surface of the wet coating film flows downward under the influence of gravity when the coating is applied on a vertical surface. The sag test helps to evaluate the flow characteristics and adaptability of the coating. Test method: The sag test is usually carried out using a sag tester. In this test, the epoxy high build paint provided in Examples 1-15 is applied to a test plate, and then the test plate is placed vertically to observe the sag phenomenon of the wet coating film and record it.

[0103] 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 thickness of 150±20μm, 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.

[0104] 4. Resistance to 10wt% sulfuric acid aqueous solution: Apply the epoxy high build paint provided in Examples 1-15 on a test plate to obtain a coating test plate with a thickness of 150±20μm, ensure that the coating is completely dry, and perform edge sealing. Immerse the coating test plate in a 10wt% sulfuric acid aqueous solution at a temperature of 25°C, and record the time when changes occur on the coating surface as the test result.

[0105] 5. Resistance to 10 wt% sodium hydroxide aqueous solution: Apply the epoxy high build paint provided in Examples 1-15 on a test plate to obtain a coating test plate with a thickness of 150±20 μm. Ensure that the coating is completely dry and perform edge sealing. Immerse the coating test plate in a 10 wt% sodium hydroxide aqueous solution at a temperature of 25°C and record the time when changes occur on the coating surface 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: By weight, the raw materials 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.

2. The water-based epoxy high build paint for rail transit bogies according to claim 1, characterized in that: The water-based curing agent is a water-based amine epoxy adduct, and the amine value of the water-based amine epoxy adduct is 150-250 mgKOH / g.

3. The water-based epoxy high build paint for rail transit bogies according to claim 2, characterized in that: The powder material at least includes carbon black, titanium dioxide, barium sulfate and silicon dioxide.

4. The water-based epoxy high build paint for rail transit bogies according to claim 3, characterized in that: The mass ratio of the carbon black, titanium dioxide, barium sulfate and silicon dioxide is 0.1:(10-20):(5-15):(1-8).

5. The water-based epoxy high build paint for rail transit bogies according to claim 4, characterized in that: The silicon dioxide is ion exchange silicon dioxide, and the particle size of the ion exchange silicon dioxide is 1-10 μm.

6. The water-based epoxy high build paint for rail transit bogies according to claim 5, characterized in that: The additives at least include 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 additive.

7. The water-based epoxy high build paint for rail transit bogies according to claim 6, characterized in that: The anti-sagging aid is selected from at least one of bentonite, cellulose and lithium magnesium silicate.

8. The water-based epoxy high build paint for rail transit bogies according to claim 7, characterized in that: The alcohol ether is selected from at least one of propylene glycol methyl ether, dipropylene glycol butyl ether and dipropylene glycol methyl ether.

9. The water-based epoxy high build paint for rail transit bogies according to claim 8, characterized in that: The dispersant is selected from Digo 755W, Efcona 6208-60, Solsperse TM At least one of 27000C.

10. A method for preparing a water-based epoxy high build paint for rail transit bogies according to any one of claims 1 to 9, characterized in that: At least the following steps are included: Deionized water and additives are added into a container and stirred to mix, then powder is added, stirred to mix and ground to a fineness of less than 20 μm, then aqueous emulsion is added under stirring, stirred to mix to obtain component A, alcohol ethers and aqueous curing agent are stirred to mix to obtain component B, and component A and component B are stirred to mix when in use.

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