A fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures

Abstract

The application belongs to the technical field of paint and specifically relates to a fluorine-modified high polymer roughness-reducing protective paint suitable for hydraulic structures. The fluorine-modified high polymer roughness-reducing protective paint suitable for hydraulic structures comprises component A and component B. The component A comprises 50-76% polyurethane-modified epoxy resin, 3.36-3.93% fluorocarbon resin, 6.19-6.61% active diluent, 1.86-1.98% silane coupling agent, 0.08-0.10% carbon black, 4.20-4.92% titanium white powder, 6.72-7.87% weather-resistant reinforcing filler, 1.00-1.18% defoaming agent and 0.59-0.69% dispersant in terms of mass percentage. The component B comprises 25.48-55.91% alicyclic amine, 23.71-59.83% phenolic amine, 14.18-19.46% hydrophobic agent and 0.35-1.50% epoxy accelerant in terms of mass percentage.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coatings, and particularly relates to a fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures. BACKGROUND

[0002] With the development of society, higher requirements are put forward for the waterproof performance of hydraulic concrete structures, especially water conveying structures. Concrete has a natural porous structure and is prone to performance degradation in a long-term water soaking environment, thereby causing phenomena such as leakage, cracking and peeling, affecting the service life and causing damage to the main structure of the hydraulic structure. Spraying a waterproof coating on the surface of the hydraulic structure is an effective method to avoid damage to the hydraulic structure and prolong the service life of the hydraulic structure.

[0003] Hydraulic structures in a high-speed water flow or sand-carrying water flow environment are prone to defects such as pitting and roughness of the waterproof coating due to the scouring of the water flow, thereby easily adhering some garbage and impurities, facilitating the growth of algae, affecting the appearance and shortening the service life of the coating. Therefore, it is urgent to develop a coating for hydraulic structures that has both waterproof and roughness-reducing properties. SUMMARY

[0004] Therefore, the application provides a fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures, which has good waterproof and roughness-reducing properties and can prolong the service life of the coating.

[0005] To solve the above technical problems, the application provides a fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures, which comprises component A and component B.

[0006] The component A comprises the following components in mass percentage:

[0007]

[0008]

[0009] The component B comprises the following components in mass percentage:

[0010]

[0011] The mass ratio of the component A and the component B is 100:15-30.

[0012] Preferably, the polyurethane-modified epoxy resin comprises DZ-25 polyurethane-modified epoxy resin and DZ-8 polyurethane-modified epoxy resin, and the mass ratio of the DZ-25 polyurethane-modified epoxy resin and the DZ-8 polyurethane-modified epoxy resin is 23.35-48.17:27.77-49.51.

[0013] Preferably, the hydrophobic agent is lotus leaf hydrophobic agent.

[0014] Preferably, the active diluent is 1,4-cyclohexanedimethanol diglycidyl ether.

[0015] Preferably, the silane coupling agent is γ-(2,3-epoxypropoxy)propyl trimethoxysilane coupling agent.

[0016] Preferably, the weather-resistant reinforcing filler is alumina and / or quartz;

[0017] Preferably, the average particle size of the alumina is 0.5-1 μm;

[0018] Preferably, the average particle size of the quartz is 4-6 μm.

[0019] Preferably, the dispersant includes Irga 680U dispersant and Irga 730U dispersant;

[0020] The mass ratio of the Irga 730U dispersant and the Irga 680U dispersant is 70:30-95:5.

[0021] Preferably, the alicyclic amine is 4,4'-diaminodicyclohexyl methane.

[0022] Preferably, the phenolic amine is phenolic amine of model 4928F.

[0023] Preferably, the epoxy accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

[0024] The application provides a fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures, which comprises component A and component B; the component A comprises the following components in mass percentage: 50-76% of polyurethane modified epoxy resin, 3.36-3.93% of fluorocarbon resin, 6.19-6.61% of active diluent, 1.86-1.98% of silane coupling agent, 0.08-0.10% of carbon black, 4.20-4.92% of titanium white powder, 6.72-7.87% of weather-resistant reinforcing filler, 1.00-1.18% of defoaming agent and 0.59-0.69% of dispersing agent; the component B comprises the following components in mass percentage: 25.48-55.91% of alicyclic amine, 23.71-59.83% of phenolic amine, 14.18-19.46% of hydrophobic agent and 0.35-1.50% of epoxy accelerant. The polyurethane modified epoxy resin as the base material can improve the adhesion and water resistance of the coating, and avoid the coating from bulging or falling off in the water environment for a long time; meanwhile, the flexibility and weather resistance of the coating are improved. In the application, the fluorocarbon resin takes the firm C-F bond as the skeleton, has good crystallinity and low surface energy, the fluorine element gradually floats to the surface in the coating curing process, increases the smoothness of the coating surface, reduces the resistance when the water flows through the coating on the surface of the hydraulic structure, and reduces the adhesion of sand and algae in the water flow, so that the coating is protected and the service life is prolonged. In the application, the addition of the hydrophobic agent can change the contact angle of the coating, the hydrophobic agent can form a special water-resistant structure on the film surface of the coating, so that the surface has strong hydrophobic, water-repellent and waterproof effects, meanwhile, the air permeability of the coating film is not affected, that is, the coating has good lotus leaf double hydrophobicity, so that the self-cleaning, stain resistance and scrub resistance and other performances of the coating are improved, the adhesion of garbage impurities on the surface of the hydraulic structure is reduced, and the coating is protected. The fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures has the following performances: 1. without interface agent, the coating can be used on the wet base surface and has excellent adhesion performance; 2. the coating has the performances of resistance reduction, roughness reduction, stain resistance and self-cleaning; 3. the coating has excellent weather resistance; 4. the coating has good flexibility; 5. the coating is waterproof, anti-impact and abrasion, and has excellent corrosion resistance; 6. the cost is moderate, the formula is green and environmentally friendly, and the coating is suitable for popularization and use. DETAILED DESCRIPTION

[0025] The application provides a fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures, which comprises component A and component B;

[0026] The component A comprises the following components in mass percentage:

[0027]

[0028] The component B comprises the following components in mass percentage:

[0029]

[0030]

[0031] In the present application, the mass ratio of component A and component B is 100:15-30, preferably 100:18.08-26.45.

[0032] In the present application, component A comprises 50-76% polyurethane modified epoxy resin by mass percentage, preferably 70-76%. In the present application, the polyurethane modified epoxy resin preferably comprises DZ-25 polyurethane modified epoxy resin and DZ-8 polyurethane modified epoxy resin. In the present application, the mass percentage of polyurethane in the DZ-25 polyurethane modified epoxy resin is preferably 18-22%, more preferably 20%; the epoxy equivalent weight of the DZ-25 polyurethane modified epoxy resin is preferably 399.7; the solid content of the DZ-25 polyurethane modified epoxy resin is preferably 70-75 wt%, more preferably 71-73%. In the present application, the mass percentage of polyurethane in the DZ-8 polyurethane modified epoxy resin is preferably 14-16%, more preferably 15%; the epoxy equivalent weight of the DZ-8 polyurethane modified epoxy resin is preferably 194.6; the solid content of the DZ-8 polyurethane modified epoxy resin is preferably 100%. In the present application, the mass ratio of the DZ-25 polyurethane modified epoxy resin and the DZ-8 polyurethane modified epoxy resin is preferably 23.35-48.17:49.51-27.77. In the present application, the mass percentage of the DZ-25 polyurethane modified epoxy resin in component A is preferably 23.41-48.09%, and the mass percentage of the DZ-8 polyurethane modified epoxy resin in component A is preferably 27.77-49.51%. In the present application, the DZ-25 polyurethane modified epoxy resin is preferably purchased from Xinjiang Keneng New Material Technology Co., Ltd., and the DZ-8 polyurethane modified epoxy resin is preferably purchased from Xinjiang Keneng New Material Technology Co., Ltd.

[0033] In the present application, both the DZ-25 polyurethane modified epoxy resin and the DZ-8 polyurethane modified epoxy resin have good flexibility and weather resistance, which can improve the flexibility and weather resistance of the coating while ensuring good adhesion of the coating.

[0034] In the present application, the component A includes 3.36-3.93% fluorocarbon resin by mass percentage, preferably 3.39-3.89%. In the present application, the fluorocarbon resin is preferably CF-803 purchased from Shanghai Deruode Trading Co., Ltd. In the present application, the fluorine content in the CF-803 is preferably 22-26%, more preferably 24%; the solid content of the CF-803 is preferably 50%. In the present application, the CF-803 can significantly increase the smoothness of the coating, reducing Ra to about 0.004 μm. In the present application, the fluorocarbon resin has good heat resistance, chemical resistance, cold resistance, low-temperature flexibility, weather resistance and electrical properties, and adding the fluorocarbon resin in the above defined content range to the polyurethane modified epoxy resin can improve the performance of the coating. In the present application, if the addition amount of the fluorocarbon resin is too much, separation between the fluorocarbon resin and the epoxy curing product will occur, causing obvious delamination in the cross section of the coating, and also causing carbon black, titanium dioxide and weather-resistant reinforcing fillers to gather on the surface of the coating with the floating of fluorine elements, resulting in obvious floating color and a rough coating surface with significantly increased Ra, which is worse than the case without adding fluorocarbon resin; if the addition amount of the fluorocarbon resin is too small, the coating surface roughness Ra will also be large, the surface smoothness is not enough, and the drag reduction effect cannot be achieved. In the present application, the fluorocarbon resin is controlled at a suitable addition amount, without additional isocyanate curing agent (toxic), improving the safety and environmental protection of the coating.

[0035] In the present application, the component A includes 6.19-6.61% active diluent by mass percentage. In the present application, the active diluent is preferably 1,4-cyclohexane dimethanol diglycidyl ether (trade name XY630) purchased from Anhui Xinyuan Science and Technology Co., Ltd. In the present application, the 1,4-cyclohexane dimethanol diglycidyl ether has good weather resistance and tensile properties, which can improve the weather resistance and flexibility of the fluorine modified high polymer drag reduction protective coating suitable for hydraulic structures, avoiding the yellowing of the coating under sunlight or the cracking of the coating due to the displacement of the building.

[0036] In the present application, the component A includes 1.86-1.98% silane coupling agent by mass percentage. In the present application, the silane coupling agent is preferably γ-(2,3-epoxypropoxy) propyl trimethoxysilane coupling agent (KH560). In the present application, the γ-(2,3-epoxypropoxy) propyl trimethoxysilane coupling agent contains epoxy groups, which has good compatibility with the polyurethane modified epoxy resins DZ-8 and DZ-25, and can improve the adhesion between inorganic materials and organic materials in the coating.

[0037] In the present application, the component A includes 0.08-0.10% carbon black in mass percentage, preferably 0.084-0.098%. In the present application, the average particle size of the carbon black is preferably 13-17 nm, more preferably 14-16 nm. In the present application, the carbon black is preferably blue shade carbon black, and the blue shade carbon black is preferably Eucliron FW200. In the present application, the carbon black has good dispersibility and can be used in the field of high blackness topcoat, and helps to improve the weather resistance and aesthetics of the coating. The purpose of selecting the blue shade carbon black in the present application is to improve the quality of the appearance of the coating, and at the same time ensure that the coating is slightly yellow even after being used for a long time. The blue shade pigment will slightly neutralize some yellow color from the visual point of view, and the dM value of this blue shade pigment is dM>0 when tested by instrument.

[0038] In the present application, the component A includes 4.20-4.92% titanium dioxide in mass percentage, preferably 4.23-4.86%. In the present application, the average particle size of the titanium dioxide is preferably 0.3-0.5 μm, more preferably 0.4 μm. In the present application, the titanium dioxide is preferably blue shade titanium dioxide. In the present application, the titanium dioxide has good dispersibility and can provide good weather resistance, anti-powdering, high gloss and color retention for the coating.

[0039] In the present application, the component A includes 6.72-7.87% weather-resistant reinforcing filler in mass percentage, preferably 6.77-7.78%. In the present application, the weather-resistant reinforcing filler is preferably alumina and / or quartz, more preferably alumina or quartz. In the present application, the alumina is preferably spherical alumina, and the average particle size of the spherical alumina is preferably 0.5-1 μm, more preferably 0.6-0.8 μm. In the present application, the quartz is preferably quartz powder, and the average particle size of the quartz powder is preferably 4-6 μm, more preferably 5 μm. In the present application, when the weather-resistant reinforcing filler is alumina and quartz, the mass percentage of the quartz in the total mass of the quartz and alumina is preferably 70-80%, more preferably 73-76%.

[0040] In the present application, the component A includes 1.00-1.18% defoaming agent in mass percentage, preferably 1.11-1.17%. In the present application, the defoaming agent is preferably organic silicon defoaming agent and non-silicon defoaming agent, and the mass ratio of the organic silicon defoaming agent and the non-silicon defoaming agent is preferably 2:1-1:3, more preferably 1:1. In the present application, the organic silicon defoaming agent is preferably P-570 defoaming agent, and the non-silicon defoaming agent is preferably P-590 defoaming agent. In the present application, the organic silicon defoaming agent is used to eliminate bubbles in the epoxy part, and the non-silicon defoaming agent is used to eliminate bubbles in the polyurethane and fluorocarbon parts.

[0041] In the present application, the component A includes 0.59-0.69% dispersant in mass percentage. In the present application, the dispersant preferably includes Optic 680U dispersant and Optic 730U dispersant. In the present application, the mass ratio of the Optic 730U dispersant and Optic 680U dispersant is preferably 70:30-95:5, more preferably 64.5:5-49.2:3.8. In the present application, the Optic 680U dispersant can disperse high-pigment carbon black, making the coating show excellent blackness; the Optic 730U dispersant can effectively reduce the viscosity of the paint slurry of titanium dioxide, and can also well disperse weather-resistant reinforcing fillers.

[0042] In the present application, the component B includes 25.48-55.91% alicyclic amine in mass percentage. In the present application, the alicyclic amine is preferably 4,4'-diaminodicyclohexyl methane (abbreviated as PACM or HMDA). In the present application, the active hydrogen of the 4,4'-diaminodicyclohexyl methane is preferably 52.5.

[0043] In the present application, the component B includes 23.71-59.83% phenolic amine in mass percentage. In the present application, the phenolic amine is preferably 4928F curing agent purchased from Changzhou Shanfeng Chemical Co., Ltd. In the present application, the active hydrogen of the 4928F is preferably 97.

[0044] In the present application, the alicyclic amine has good weather resistance, the phenolic amine has good water resistance and low yellowing, and the copolymerization of the alicyclic amine and the phenolic amine as a curing agent can cure the polyurethane modified epoxy resin, improve the wet surface curing ability of the epoxy coating and the water resistance of the product.

[0045] In the present application, the component B includes 14.18-19.46% hydrophobic agent in mass percentage. In the present application, the hydrophobic agent is preferably lotus leaf hydrophobic agent, and the lotus leaf hydrophobic agent is preferably KN6615 hydrophobic agent purchased from Xinjiang Keneng New Material Technology Co., Ltd. The KN6615 hydrophobic agent is a fluorine-modified lotus leaf type hydrophobic agent with a solid content of 50%, which can be applied in solvent-based and water-based systems. In the present application, the KN6615 hydrophobic agent is a mixture of fluorine-modified polysiloxane emulsion and amino-functional polysiloxane solution, and the mass ratio of the fluorine-modified polysiloxane emulsion and the amino-functional polysiloxane solution is 1:2. The fluorine-modified polysiloxane emulsion has good affinity and permeability to concrete, can promote the penetration of the coating into the surface of the hydraulic structure, and improve the bonding performance. The amino-functional polysiloxane solution can provide a strong water bead effect and early water resistance, and the amino functional group can also participate in the reaction, promote the shortening of the surface drying time of the epoxy coating, and improve the tensile strength of each cycle.

[0046] The application limits the amount of hydrophobic agent to the above range to achieve the above performance. If the amount of hydrophobic agent is too large, the amino group in the cured product will be excessive, and the amino group will generate ammonium salt in a humid environment, the coating will absorb water and turn white, reducing water resistance and easily causing the coating to fall off. If the amount is too small, the contact angle of the coating with water will decrease, damaging the hydrophobic and anti-fouling properties of the coating.

[0047] In the application, the component B comprises 0.35-1.50% of an epoxy promoter in terms of mass percentage. In the application, the epoxy promoter is preferably 2,4,6-tris(dimethylaminomethyl)phenol (K54). In the application, the epoxy promoter can promote the shortening of the surface drying time of the epoxy coating, improve the tensile strength within 7 days of maintenance after construction, and optimize the construction efficiency.

[0048] In the application, the fluorine-modified high polymer roughness-preventing protective coating for hydraulic structures is preferably prepared according to the following method:

[0049] The polyurethane-modified epoxy resin, fluorocarbon resin, active diluent, silane coupling agent, carbon black, titanium dioxide, weather-resistant reinforcing filler, defoaming agent, and dispersant are first mixed to obtain component A;

[0050] The alicyclic amine, phenolic amine, hydrophobic agent, and epoxy promoter are secondly mixed to obtain component B.

[0051] The application does not make specific limitations on the mixing methods of the first mixing and the second mixing, as long as they can be fully mixed. In the application, the first mixing is preferably carried out under grinding conditions. In the application, the grinding is preferably ball milling, the ball milling balls are preferably zirconium balls, the diameter of the zirconium balls is preferably 0.6 mm, and the ball milling time is preferably 4-6 h, more preferably 5 h. In the application, the second mixing is preferably carried out under stirring conditions, the stirring speed is preferably 550-650 r / min, more preferably 600 r / min, and the stirring time is preferably 5-30 min, more preferably 10-15 min.

[0052] After obtaining component A and component B, the application preferably places component A and component B separately, and when needed, mixes component A and component B according to the mass ratio, and then performs coating.

[0053] In the application, the mixing is preferably carried out under stirring conditions, the stirring speed is preferably 1300-1500 rpm, more preferably 1400 r / min, and the stirring time is preferably 3-5 min, more preferably 4-5 min. In the application, the coating method is preferably spraying or brushing. The application does not have special requirements for the spraying, and the conventional method in the art can be used.

[0054] In the present application, the thickness of the coating layer obtained by using the fluorine-modified high polymer roughness-reducing protective coating for hydraulic structures provided by the present application is preferably 500-1075 μm, and more preferably 500-850 μm.

[0055] The fluorine-modified high polymer roughness-reducing protective coating for hydraulic structures provided by the present application has the following advantages:

[0056] (1) No interface agent is needed, and the coating can be used on a wet base surface, and has excellent adhesion, with the adhesion strength of ≥3.0 for a dry concrete base surface and ≥2.5 for a wet base surface, which is higher than the standard of the adhesion strength of the epoxy resin waterproof coating specified in JC / T2217-2014;

[0057] (2) The coating layer has high surface smoothness, with a surface roughness (Ra) of ≤0.004 μm, and good hydrophobicity, with a contact angle of ≥106°, and can achieve the effect of reducing resistance and roughness;

[0058] (3) Good stain resistance, which can reach level 1 or above according to the detection of the building coating layer stain resistance test method in GBT9780-2013;

[0059] (4) Not prone to yellowing, and has good weather resistance, and after 1000 h of artificial climate aging, the coating layer has a good appearance, without blistering, peeling, or cracking;

[0060] (5) Excellent mechanical properties, with a tensile strength of the product of ≥20 MPa and an elongation at break of ≥30% under 7 d natural curing;

[0061] (6) High crosslinking density, waterproof, anti-impact and abrasion, and excellent corrosion resistance;

[0062] (7) High solid content, green and environmentally friendly, convenient to construct, can be sprayed or brushed, long service life, and high cost performance.

[0063] In order to further illustrate the present application, the technical solutions provided by the present application are described in detail below in combination with examples, but they should not be understood as limiting the scope of protection of the present application.

[0064] Example 1

[0065] Preparation of the A component:

[0066] A component: 563.59 g of DZ-25 flexible weatherable epoxy resin (polyurethane content of 20%, epoxy equivalent weight of 399.7, solid content of 71%), 325.47 g of DZ-8 flexible weatherable epoxy resin (polyurethane content of 15%, epoxy equivalent weight of 194.6, solid content of 100%), 39.69 g of CF-803 fluorocarbon resin (fluorine content of 24%, solid content of 50%), 72.56 g of XY630, 21.77 g of KH560, 5.95 g of P-570, 5.95 g of P-590, 0.50 g of Irgacure 680U, 6.45 g of Irgacure 730U, 49.61 g of titanium dioxide with an average particle size of 0.4 μm, 0.99 g of carbon black with an average particle size of 15 nm, 79.37 g of spherical alumina powder with an average particle size of 0.8 μm, and 585.95 g of zirconium beads with a diameter of 0.6 mm were oscillation ground in a refiner for 5 h, and the zirconium beads and impurities were removed by filtration to obtain component A.

[0067] Preparation of B component:

[0068] 118.48 g of PACM, 50.78 g of 4928F, 2.96 g of K54, and 39.69 g of KN6615 hydrophobic agent (solid content of 50%) were stirred at a rotation speed of 600 r / min and a temperature of room temperature for 15 min to obtain component B.

[0069] Preparation of fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures:

[0070] Components A and B were stirred at a rotation speed of 1400 r / min and a temperature of room temperature for 5 min at a mass ratio of 100:18.08 to obtain a fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures.

[0071] The performance of the fluorine-modified high polymer roughness-reducing protective coating suitable for hydraulic structures was detected by the following method:

[0072] (1) Viscosity: The initial viscosity of the flexible weatherable epoxy coating was determined by a rotary viscometer according to 5.1 of GB / T2794-1995, and the result was 2331 mPa·s.

[0073] (2) Pot life at room temperature 23℃: The result was 150 min according to the test method specified in GB / T7123.1-2002.

[0074] (3) Surface dry time at room temperature 23℃: The surface dry time of the flexible weatherable epoxy coating was tested according to Chapter 16 of GB / T16777-2008, and the result was 6h55min.

[0075] (4) The tensile properties of the sample cured at room temperature in air: dumbbell type I samples were prepared according to GB / T528-2009, and the samples were cured at room temperature (23±2) ℃ and humidity (50±10) % environment, and the tensile properties were tested after 7 days, the tensile strength was 11.35 MPa, and the elongation at break was 88%; the tensile properties were tested after 28 days, the tensile strength was 20.60 MPa, and the elongation at break was 45%.

[0076] (5) Adhesion strength: the adhesion strength was tested according to the method specified in 7.9 of JC / T2217-2014. The dry base and the wet base were directly brushed with the fluorine-modified high polymer roughness reduction protective coating, and the following three ways were adopted for curing: a, after 7 days of room temperature air curing, soaking in room temperature water for 28 days; b, after 21 days of room temperature air curing, soaking in room temperature water for 28 days; c, 7 days of room temperature air curing. The coating on the sample block did not have peeling, cracking and peeling in the above whole process. The adhesion strength was tested by pulling, and the data is shown in Table 1.

[0077] Table 1 Adhesion strength test results

[0078] Curing Condition Dry Substrate Bond Strength Wet Substrate Bond Strength Room Temperature Air 7 Days Room Temperature Water 28 Days 3.862 MPa 3.210 MPa Room Temperature Air 21 Days Room Temperature Water 28 Days 4.336 MPa 3.753 MPa Room Temperature Air 7 Days 4.742 MPa 4.255 MPa

[0079] It can be seen from Table 1 that no matter what kind of brushing and curing method is adopted, the fluorine-modified high polymer roughness reduction protective coating has excellent adhesion strength, the adhesion strength of the dry base of the concrete is ≥3.0 MPa and is substrate failure, the adhesion strength of the wet base is ≥2.5 MPa and is substrate failure, no interface agent is needed, and it can be used on the wet base.

[0080] (6) The surface roughness of the fluorine-modified high polymer roughness reduction protective coating was tested, and the Ra value was 0.004 μm, indicating that the coating film surface has high smoothness and can reduce resistance and roughness.

[0081] (7) The contact angle of the fluorine-modified high polymer roughness reduction protective coating with pure water was 106.37°, indicating that the hydrophobicity is good and can reduce resistance and roughness.

[0082] (8) According to the GBT9780-2013 building coating layer stain resistance test method, the fluorine-modified high polymer roughness reduction protective coating can reach level 1 or above, indicating good stain resistance.

[0083] (9) Weather resistance: the above sample cured at room temperature in air for 7 days was prepared under the same conditions, and after 1000 h of artificial climate aging, the coating appearance was good, without blistering, peeling, and cracking. The adhesion strength of the sample was 3.317 MPa and was substrate failure.

[0084] (10) According to the test on the anti-permeation pressure of the coating in JC / T2217-2014, the experimental result is 1.4 MPa; according to the tests on the anti-freezing property, the resistance to chemical medium (acid resistance, alkali resistance, salt resistance), and the impact resistance (falling ball method, 500 g, 100 mm), the coating has no cracking, peeling, and peeling.

[0085] (11) According to the dry heat cycle and wet heat cycle tests on the thermal compatibility in EN13687, and the freeze-thaw cycle test (200 times), the coating has no cracking, peeling, and peeling.

[0086] (12) The anti-impact strength is tested by the underwater steel ball method, and the experimental result is 506 h / (kg / m 2 ).

[0087] Example 2

[0088] Preparation of component A:

[0089] 182.28 g of DZ-25 flexible weather-resistant epoxy resin (the content of polyurethane is 20%, the epoxy equivalent weight is 399.7, and the solid content is 71%), 385.43 g of DZ-8 flexible weather-resistant epoxy resin (the content of polyurethane is 15%, the epoxy equivalent weight is 194.6, and the solid content is 100%), 30.30 g of CF-803 fluorocarbon resin (the fluorine content is 24%, and the solid content is 50%), 51.48 g of XY630, 15.45 g of KH560, 4.54 g of P-570, 4.54 g of P-590, 0.38 g of Ucaco 680U, 4.92 g of Ucaco 730U, 37.87 g of titanium dioxide with an average particle size of 0.4 μm, 0.76 g of carbon black with an average particle size of 15 nm, 60.59 g of 3000-mesh quartz powder, and 389.27 g of zirconium beads with a diameter of 0.6 mm are oscillation ground in a grinding mill for 5 h, and the zirconium beads and impurities are removed by filtration to obtain component A.

[0090] Preparation of component B:

[0091] 52.46 g of PACM, 122.41 g of 4928F, 0.75 g of K54, and 30.30 g of KN6615 hydrophobic agent (the solid content is 50%) are stirred at a rotation speed of 600 r / min and a temperature of room temperature for 15 min to obtain component B.

[0092] Preparation of fluorine-modified high polymer anti-erosion protective coating suitable for hydraulic structures:

[0093] Components A and B are stirred at a rotation speed of 1400 r / min and a temperature of room temperature for 5 min at a mass ratio of 100:26.45 to obtain the fluorine-modified high polymer anti-erosion protective coating suitable for hydraulic structures.

[0094] The performance of the fluorine-modified high polymer roughness-reducing protective coating for hydraulic structures was detected according to the following method:

[0095] (1) Viscosity: The initial viscosity of the flexible weather-resistant epoxy coating was detected according to 5.1 of GB / T2794-1995 by using a rotary viscometer, and the result was 1889 mPa·s.

[0096] (2) Applicable period at room temperature 23℃: The result was 120 min according to the test method specified in GB / T7123.1-2002.

[0097] (3) Surface dry time at room temperature 23℃: The surface dry time of the flexible weather-resistant epoxy coating was detected according to Chapter 16 of GB / T16777-2008, and the result was 4h30min.

[0098] (4) Tensile property of air-cured at room temperature: The dumbbell I-shaped sample was prepared according to the specification of GB / T528-2009, and the sample was cured at room temperature (23±2)℃ and humidity (50±10)%, and the tensile property was detected after 7 days, the tensile strength was 15 MPa, and the elongation at break was 64%; the tensile property was detected after 28 days, the tensile strength was 32 MPa, and the elongation at break was 30%.

[0099] (5) Bonding strength: The bonding strength was detected according to the method specified in 7.9 of JC / T2217-2014. The dry base surface and the wet base surface were directly coated with the fluorine-modified high polymer roughness-reducing protective coating, and the following three curing methods were adopted: a, air-cured at room temperature for 7 days and then immersed in water at room temperature for 28 days; b, air-cured at room temperature for 21 days and then immersed in water at room temperature for 28 days; c, air-cured at room temperature for 7 days. The coating on the sample was not peeled, cracked or peeled off during the above process. The bonding strength was detected by pulling, and the data is shown in Table 2.

[0100] Table 2 Bonding strength test results

[0101] Curing Condition Dry Substrate Bond Strength Wet Substrate Bond Strength Room Temperature Air 7 Days Room Temperature Water 28 Days 4.217 MPa 3.369 MPa Room Temperature Air 21 Days Room Temperature Water 28 Days 4.852 MPa 4.259 MPa Room Temperature Air 7 Days 5.318 MPa 4.767 MPa

[0102] As can be seen from Table 2, no matter what kind of coating and curing method is adopted, the fluorine-modified high polymer roughness-reducing protective coating has excellent bonding strength, the bonding strength of the dry base surface of the concrete is ≥3.0 MPa and the base material is damaged, the bonding strength of the wet base surface is ≥3.0 MPa and the base material is damaged, and no interface agent is needed, which can be used on the wet base surface. ≥ 2.5 MPa

[0103] (6) The surface roughness of the fluorine-modified high polymer roughness-reducing protective coating was detected, and the Ra value was 0.004, which indicated that the coating film surface had high smoothness and could reduce resistance and roughness.

[0104] ​(7) The contact angle of the fluorine-modified high polymer roughness-reducing protective coating with pure water is 106.24°, indicating that the hydrophobicity is good and the effect of reducing roughness and resistance can be achieved.

[0105] (8) According to the test method for coating stain resistance of building coatings in GBT9780-2013, the fluorine-modified high polymer roughness-reducing protective coating can reach level 1 or above, indicating good stain resistance.

[0106] (9) Weather resistance: under the same conditions, the sample block cured at room temperature for 7 days is subjected to 1000h artificial climate aging, and the coating appearance is good without blistering, peeling, and cracking. The adhesive strength of the test sample block is 3.520 MPa and the substrate is damaged.

[0107] (10) According to the test for coating resistance to osmotic pressure in JC / T2217-2014, the experimental result is 1.5 MPa; the tests for frost resistance, chemical medium resistance (acid resistance, alkali resistance, and salt resistance), and impact resistance (falling ball method, 500g, 100mm) show that the coating has no cracking, peeling, and peeling.

[0108] (11) According to the dry heat cycle and wet heat cycle tests for thermal compatibility in EN13687, and the freeze-thaw cycle test (200 times), the coating has no cracking, peeling, and peeling.

[0109] (12) The underwater steel ball method is used to test the impact resistance, and the experimental result is 520h / (kg / m 2 ).

[0110] Comparative Example 1 (increasing the amount of CF-803 fluorocarbon resin)

[0111] The fluorine-modified high polymer roughness-reducing protective coating for hydraulic structures is prepared according to the method of Example 1, except that the amount of CF-803 fluorocarbon resin is adjusted to 99.23g.

[0112] The performance of the fluorine-modified high polymer roughness-reducing protective coating for hydraulic structures is detected according to the following methods:

[0113] (1) Viscosity: the initial viscosity of the flexible weather-resistant epoxy coating is determined according to the method specified in 5.1 of GB / T2794-1995, and the result is 2746mPa·s.

[0114] (2) Pot life at room temperature 23℃: according to the test method specified in GB / T7123.1-2002, the result is 160min.

[0115] (3) Surface drying time at room temperature 23℃: the surface drying time of the flexible weather-resistant epoxy coating is tested according to Chapter 16 of GB / T16777-2008, and the result is 7h15min.

[0116] (4), the tensile properties of room temperature air curing: according to the provisions of GB / T528-2009 preparation dumbbell I type sample, the sample surface gets color and pattern, there is obvious uneven phenomenon in cross section. The sample is cured at room temperature (23±2) ℃ humidity (50±10) % environment, after 7 days, the tensile properties are tested, the tensile strength is 8.62 MPa, the elongation at break is 58%; after 28 days, the tensile properties are tested, the tensile strength is 17.28 MPa, the elongation at break is 32%. Too much CF-803 resin cannot effectively enter the polymer crosslinking network, resulting in the decrease of tensile properties (including tensile strength and elongation at break).

[0117] (5), the bonding strength: according to the method of 7.9 in JC / T2217-2014, the bonding strength is tested. The dry base and wet base are directly brushed with fluorine modified high polymer roughness prevention coating, and the following three ways are adopted for curing: a, after 7 days of room temperature air curing, soaking in room temperature water for 28 days; b, after 21 days of room temperature air curing, soaking in room temperature water for 28 days; c, after 7 days of room temperature air curing. The coating on the sample block has no peeling, cracking and peeling in the whole process. The bonding strength is tested by pulling, and the data is shown in table 3.

[0118] Table 3 bonding strength test results

[0119] Curing Condition Dry Substrate Bond Strength Wet Substrate Bond Strength Room Temperature Air 7 Days Room Temperature Water 28 Days 2.857 MPa 2.135 MPa Room Temperature Air 21 Days Room Temperature Water 28 Days 3.811 MPa 3.006 MPa Room Temperature Air 7 Days 4.439 MPa 3.728 MPa

[0120] From table 3, it can be seen that: the addition of excessive CF-803 fluorocarbon resin will also lead to the decrease of bonding strength, especially the wet base bonding strength.

[0121] (6), the surface roughness of fluorine modified high polymer roughness prevention coating is tested, the Ra value is 0.486 μm, which shows that after the excessive CF-803 fluorocarbon resin, the pigment and filler powder float to the surface of the coating, which leads to the decrease of surface roughness.

[0122] (7), the contact angle of fluorine modified high polymer roughness prevention coating with pure water is 106.18°, which shows that even if the CF-803 fluorocarbon resin is excessive, but the amount of KN6615 hydrophobic agent is reasonable, the hydrophobicity of the coating will not be reduced.

[0123] (8), according to the test method of GBT9780-2013 building coating coating stain resistance, the fluorine modified high polymer roughness prevention coating can reach 1 level or more, which shows that even if the CF-803 fluorocarbon resin is excessive, but the amount of KN6615 hydrophobic agent is reasonable, the stain resistance of the coating is still good.

[0124] (9) Weather resistance: the sample blocks prepared under the same conditions as described above and cured in air at room temperature for 7 days were subjected to 1000 h artificial weathering, and the coating had no blistering, peeling, or cracking. The adhesive strength of the test sample was 3.108 MPa, and the substrate was damaged, indicating that the excess of CF-803 fluorocarbon resin had no effect on the weather resistance.

[0125] (10) According to the test on the anti-permeation pressure of the coating in JC / T2217-2014, the experimental result was 1.3 MPa; and according to the tests on the frost resistance, chemical medium resistance (acid resistance, alkali resistance, and salt resistance), and impact resistance (falling ball method, 500 g, 100 mm), the coating had no cracking, peeling, or peeling.

[0126] (11) According to the dry heat cycle and wet heat cycle tests and the freeze-thaw cycle test (200 times) on the thermal compatibility in EN13687, the coating had no cracking, peeling, or peeling.

[0127] (12) The anti-erosion strength was tested by the underwater steel ball method, and the experimental result was 504 h / (kg / m 2 ).

[0128] Comparative Example 2 (increasing the amount of KN6615 hydrophobic agent)

[0129] A fluorine-modified high polymer anti-weathering protective coating suitable for hydraulic structures was prepared according to the method of Example 1, except that the amount of KN6615 hydrophobic agent was adjusted to 99.23 g.

[0130] The performance of the fluorine-modified high polymer anti-weathering protective coating suitable for hydraulic structures was tested according to the following methods:

[0131] (1) Viscosity: the initial viscosity of the flexible weather-resistant epoxy coating was determined according to the method specified in 5.1 of GB / T2794-1995, and the result was 2573 mPa·s.

[0132] (2) Pot life at room temperature 23℃: according to the test method specified in GB / T7123.1-2002, the result was 135 min.

[0133] (3) Surface drying time at room temperature 23℃: the surface drying time of the flexible weather-resistant epoxy coating was tested according to Chapter 16 of GB / T16777-2008, and the result was 4 h 20 min.

[0134] (4) The tensile properties of the room temperature air curing: dumbbell I type sample was prepared according to the provisions of GB / T528-2009, the sample was cured at room temperature (23±2) ℃ and humidity (50±10) %, after 7 days, the tensile properties were tested, the tensile strength was 13.74 MPa, and the elongation at break was 41%; after 28 days, the tensile properties were tested, the tensile strength was 23.80 MPa, and the elongation at break was 13%. It is shown that when the dosage of KN6615 hydrophobic agent is too high, the elongation at break of the coating will decrease obviously, i.e. the flexibility of the coating will decrease obviously.

[0135] (5) The adhesion strength was tested according to the method of 7.9 of JC / T2217-2014. The dry base and the wet base were directly coated with fluorine modified high polymer roughness prevention coating, and the following three ways were adopted for curing: a, after 7 days of room temperature air curing, soaking in room temperature water for 28 days; b, after 21 days of room temperature air curing, soaking in room temperature water for 28 days; c, 7 days of room temperature air curing. During the above whole process, the coating on the sample of c curing method was free of peeling, cracking and peeling, and the sample of a and b curing methods had small bubbles, and the bubbles of a curing method were more intensive than those of b curing method, which shows that when the dosage of KN6615 hydrophobic agent is too high, the amino functional groups of the whole crosslinking system will be excessive, the amino functional groups will be slowly dissolved when the coating is soaked in water, which will result in the decrease of water resistance of the coating and the influence on the adhesion strength. The adhesion strength was tested by pulling, and the data are shown in Table 4.

[0136] Table 4 Adhesion strength test results

[0137] Curing Condition Dry Substrate Bond Strength Wet Substrate Bond Strength Room Temperature Air 7 Days Room Temperature Water 28 Days 2.157 MPa 1.913 MPa Room Temperature Air 21 Days Room Temperature Water 28 Days 3.064 MPa 2.752 MPa Room Temperature Air 7 Days 4.533 MPa 3.961 MPa

[0138] It can be seen from Table 4 that when the dosage of KN6615 hydrophobic agent is too high, the water resistance will decrease, which will reduce the adhesion strength of the coating, especially the sample of wet base coating and then soaking in water, which is completely undesirable for hydraulic structures.

[0139] (6) The surface roughness of the fluorine modified high polymer roughness prevention coating was tested, and the Ra value was 0.004 μm, which shows that when the dosage of KN6615 hydrophobic agent is too high, it has no influence on the surface smoothness of the coating film.

[0140] (7) The contact angle of the fluorine modified high polymer roughness prevention coating with pure water was tested, which was 106.42°, which shows that when the dosage of KN6615 hydrophobic agent is too high, it has no influence on the hydrophobicity.

[0141] (8) According to the test method of GBT9780-2013 building coating layer stain resistance, the fluorine modified high polymer roughness prevention coating can reach level 1 or above, which shows that when the dosage of KN6615 hydrophobic agent is too high, it has no influence on the stain resistance.

[0142] (9) Weather resistance: The sample block prepared under the same conditions as described above and cured in air at room temperature for 7 days was subjected to artificial weathering for 1000 h, and the coating had no blistering, peeling, or cracking. The adhesive strength of the test sample was 3.688 MPa, and the substrate was damaged, indicating that the amount of KN6615 hydrophobic agent was too high and had no effect on weather resistance.

[0143] (10) According to the test on the anti-permeation pressure of the coating in JC / T2217-2014, the experimental result was 1.0 MPa; and according to the tests on the frost resistance, chemical medium resistance (acid resistance, alkali resistance, and salt resistance), and impact resistance (falling ball method, 500 g, 100 mm), except for the acid resistance and salt resistance tests, the coating had no cracking, peeling, or peeling, indicating that the amount of KN6615 hydrophobic agent was too high, and the excess ammonia functional groups were prone to react with acid and salt substances, resulting in defects in the appearance of the coating.

[0144] (11) According to the dry heat cycle and wet heat cycle tests and the freeze-thaw cycle test (200 times) on thermal compatibility in EN13687, except for the wet heat cycle, the coating had no cracking, peeling, or peeling, indicating that after the amount of KN6615 hydrophobic agent was too high, the coating was not suitable for use in a wet heat environment.

[0145] (12) The anti-impact and abrasion strength was tested by the underwater steel ball method, and the experimental result was 486 h / (kg / m 2 ).

[0146] Comparative Example 3 (reducing the amount of CF-803 fluorocarbon resin)

[0147] A fluorine-modified high polymer anti-erosion protective coating suitable for hydraulic structures was prepared according to the method of Example 1, except that the amount of CF-803 fluorocarbon resin was adjusted to 19.85 g.

[0148] The performance of the fluorine-modified high polymer anti-erosion protective coating suitable for hydraulic structures was tested according to the following methods:

[0149] (1) Viscosity: The initial viscosity of the flexible weather-resistant epoxy coating was determined by a rotary viscometer according to the provisions of 5.1 in GB / T2794-1995, and the result was 2067 mPa·s.

[0150] (2) Pot life at room temperature 23℃: According to the test method specified in GB / T7123.1-2002, the result was 145 min.

[0151] (3) Surface drying time at room temperature 23℃: The surface drying time of the flexible weather-resistant epoxy coating was tested according to Chapter 16 of GB / T16777-2008, and the result was 6h40min.

[0152] (4) The tensile properties of the room temperature air curing: dumbbell I type samples were prepared according to the provisions of GB / T528-2009, the samples were cured at room temperature (23±2) ℃ and humidity (50±10) %, the tensile properties were tested after 7 days, the tensile strength was 10.87 MPa, and the elongation at break was 102%; the tensile properties were tested after 28 days, the tensile strength was 18.29 MPa, and the elongation at break was 52%, indicating that when the amount of CF-803 fluorocarbon resin was insufficient, the tensile strength slightly decreased, and the elongation at break correspondingly increased.

[0153] (5) The bonding strength: the bonding strength was tested according to the method specified in 7.9 of JC / T2217-2014. The dry base and the wet base were directly brushed with the fluorine modified high polymer roughness reduction protective coating, and the following three ways were adopted for curing: a, after 7 days of room temperature air curing, soaking in room temperature water for 28 days; b, after 21 days of room temperature air curing, soaking in room temperature water for 28 days; c, 7 days of room temperature air curing. The coating on the sample block did not have peeling, cracking and peeling in the above whole process. The bonding strength was tested by pulling, and the data is shown in Table 5.

[0154] Table 5 Bonding strength test results

[0155] Curing Condition Dry Substrate Bond Strength Wet Substrate Bond Strength Room Temperature Air 7 Days Room Temperature Water 28 Days 4.072 MPa 3.304 MPa Room Temperature Air 21 Days Room Temperature Water 28 Days 4.345 MPa 3.795 MPa Room Temperature Air 7 Days 5.026 MPa 4.385 MPa

[0156] It can be seen from Table 1 that: no matter what kind of brushing and curing method is adopted, the fluorine modified high polymer roughness reduction protective coating obtained has excellent bonding strength, the dry base of the concrete is ≥3.0 MPa and is substrate failure, the wet base is ≥2.5 MPa and is substrate failure, no interface agent is needed, and it can be used on the wet base, indicating that when the amount of CF-803 fluorocarbon resin is insufficient, it will not affect the bonding strength of the coating.

[0157] (6) The surface roughness of the fluorine modified high polymer roughness reduction protective coating was tested, and the Ra value was 0.148 μm, indicating that when the amount of CF-803 fluorocarbon resin was insufficient, the surface smoothness of the coating film decreased, and the effect of drag reduction and roughness reduction weakened.

[0158] (7) The contact angle of the fluorine modified high polymer roughness reduction protective coating with pure water was 100.95°, indicating that when the amount of CF-803 fluorocarbon resin was insufficient, the hydrophobicity slightly decreased.

[0159] (8) According to the test method for the stain resistance of building coatings in GBT9780-2013, the fluorine modified high polymer roughness reduction protective coating can reach level 1 or above, and when the amount of CF-803 fluorocarbon resin is insufficient, it has little effect on the stain resistance.

[0160] (9) Weather resistance: the sample blocks prepared under the same conditions as described above and cured in air at room temperature for 7 days were subjected to 1000 h artificial weathering, and the coating had no blistering, peeling, or cracking. The adhesive strength of the test sample was 3.406 MPa and the substrate was damaged, indicating that the use of CF-803 fluorocarbon resin in a small amount had little effect on weather resistance.

[0161] (10) According to the test on the anti-permeation pressure of the coating in JC / T2217-2014, the experimental result was 1.1 MPa; the tests on the frost resistance, chemical medium resistance (acid resistance, alkali resistance, salt resistance), and impact resistance (falling ball method, 500 g, 100 mm) showed that the coating had no cracking, peeling, and peeling.

[0162] (11) According to the dry heat cycle and wet heat cycle tests and the freeze-thaw cycle test (200 times) on thermal compatibility in EN13687, the coating had no cracking, peeling, and peeling.

[0163] (12) The anti-erosion strength was tested by the underwater steel ball method, and the experimental result was 498 h / (kg / m 2 ).

[0164] Comparative Example 4 (reducing the amount of KN6615 hydrophobic agent)

[0165] A fluorine-modified high polymer anti-weathering protective coating suitable for hydraulic structures was prepared according to the method of Example 1, except that the amount of KN6615 hydrophobic agent was adjusted to 19.85 g.

[0166] The performance of the fluorine-modified high polymer anti-weathering protective coating suitable for hydraulic structures was tested according to the following methods:

[0167] (1) Viscosity: the initial viscosity of the flexible weather-resistant epoxy coating was determined according to 5.1 of GB / T2794-1995 using a rotational viscometer, and the result was 2275 mPa·s.

[0168] (2) Pot life at room temperature 23℃: according to the test method specified in GB / T7123.1-2002, the result was 175 min.

[0169] (3) Surface drying time at room temperature 23℃: the surface drying time of the flexible weather-resistant epoxy coating was tested according to Chapter 16 of GB / T16777-2008, and the result was 8 h.

[0170] (4) The tensile properties of the room temperature air curing: dumbbell I type samples were prepared according to the provisions of GB / T528-2009, the samples were cured at room temperature (23±2) ℃ and humidity (50±10) %, the tensile properties were tested after 7 days, the tensile strength was 9.95 MPa, and the elongation at break was 110%; the tensile properties were tested after 28 days, the tensile strength was 16.47 MPa, and the elongation at break was 65%, indicating that when the amount of KN6615 hydrophobic agent was insufficient, the tensile strength slightly decreased, and the elongation at break correspondingly increased.

[0171] (5) The adhesive strength: the adhesive strength was tested according to the method specified in 7.9 of JC / T2217-2014. The dry base and the wet base were directly brushed with the fluorine modified high polymer roughness reduction protective coating, and the following three ways were adopted for curing: a, after 7 days of room temperature air curing, soaking in room temperature water for 28 days; b, after 21 days of room temperature air curing, soaking in room temperature water for 28 days; c, 7 days of room temperature air curing. The coating on the sample block was free of peeling, cracking and peeling during the above-mentioned whole process. The adhesive strength was tested by pulling, and the data is shown in Table 6.

[0172] Table 6 Adhesive strength test results

[0173] Curing Condition Dry Substrate Bond Strength Wet Substrate Bond Strength Room Temperature Air 7 Days Room Temperature Water 28 Days 3.564 MPa 3.047 MPa Room Temperature Air 21 Days Room Temperature Water 28 Days 4.092 MPa 3.476 MPa Room Temperature Air 7 Days 4.630 MPa 4.089 MPa

[0174] It can be seen from Table 6 that when the amount of KN6615 hydrophobic agent is insufficient, it has little effect on the adhesive strength of the coating.

[0175] (6) The surface roughness of the fluorine modified high polymer roughness reduction protective coating was tested, and the Ra value was 0.004 μm, indicating that when the amount of KN6615 hydrophobic agent was insufficient, it had little effect on the surface smoothness of the coating film.

[0176] (7) The contact angle of the fluorine modified high polymer roughness reduction protective coating with pure water was 82.02°, indicating that when the amount of KN6615 hydrophobic agent was insufficient, the hydrophobicity decreased significantly, which was not conducive to the drag reduction and roughness reduction effect of the coating.

[0177] (8) According to the test method for stain resistance of building coating in GBT9780-2013, the fluorine modified high polymer roughness reduction protective coating can reach level 2 or above, indicating that when the amount of KN6615 hydrophobic agent was insufficient, the stain resistance decreased significantly.

[0178] (9) Weather resistance: under the same conditions, the above-mentioned sample block cured at room temperature for 7 days was prepared, after 1000 h of artificial climate aging, the coating appearance was good, without blistering, peeling, and cracking. The adhesive strength of the sample block was 3.363 MPa, and the substrate was damaged, indicating that when the amount of KN6615 hydrophobic agent was insufficient, it had little effect on the weather resistance.

[0179] (10) According to the test on the anti-permeation pressure of the coating in JC / T2217-2014, the experimental result is 1.1 MPa; according to the tests on the anti-freezing property, the resistance to chemical medium (acid resistance, alkali resistance, salt resistance), and the impact resistance (falling ball method, 500 g, 100 mm), the coating has no cracking, peeling, and peeling.

[0180] (11) According to the dry heat cycle and the wet heat cycle, and the freeze-thaw cycle test (200 times) on the thermal compatibility in EN13687, the coating has no cracking, peeling, and peeling.

[0181] (12) The anti-impact strength is tested by the underwater steel ball method, and the experimental result is 501 h / (kg / m 2 ).

[0182] Although the above embodiment has made a detailed description of the present application, it is only a part of the embodiments of the present application, but not all the embodiments, and people can also obtain other embodiments according to the present embodiment without creativity, which all belong to the protection scope of the present application.

Claims

1. A fluorine-modified polymer roughness-reducing and protective coating suitable for hydraulic structures, characterized in that, Includes component A and component B; Component A comprises the following components in mass percentage: Polyurethane-modified epoxy resin 70-76%; Fluorocarbon resin 3.36~3.93%; Reactive diluent 6.19~6.61%; Silane coupling agent 1.86~1.98%; Carbon black 0.084~0.098%; Titanium dioxide content: 4.20-4.92%; Weather-resistant reinforcing filler: 6.72~7.87%; Defoamer 1.00~1.18%; Dispersant 0.59~0.69%; The polyurethane-modified epoxy resin includes DZ-25 polyurethane-modified epoxy resin and DZ-8 polyurethane-modified epoxy resin; the DZ-25 polyurethane-modified epoxy resin has a polyurethane content of 18-22% by mass, an epoxy equivalent of 399.7, and a solid content of 70-75 wt%; the DZ-8 polyurethane-modified epoxy resin has a polyurethane content of 14-16% by mass, an epoxy equivalent of 194.6, and a solid content of 100%; the mass ratio of the DZ-25 polyurethane-modified epoxy resin to the DZ-8 polyurethane-modified epoxy resin is 23.35-48.17:27.77-49.51; the fluorocarbon resin is CF-803, the fluorine content of CF-803 is 22-26%, and the solid content of CF-803 is 50%. Component B comprises the following components in mass percentage: Alicyclic amines: 25.48%~55.91%; Phenolic amines: 23.71%–59.83%; Hydrophobic agent content: 14.18~19.46%; Epoxy accelerator 0.35~1.50%; The alicyclic amine is 4,4'-diaminodicyclohexylmethane; The hydrophobic agent is a lotus leaf hydrophobic agent, which is a mixture of fluorinated polysiloxane emulsion and amino-functionalized polysiloxane solution, wherein the mass ratio of the fluorinated polysiloxane emulsion to the amino-functionalized polysiloxane solution is 1:2; the lotus leaf hydrophobic agent is KN6615 hydrophobic agent; the solid content of the KN6615 hydrophobic agent is 50%. The mass ratio of component A to component B is 100:15~30; The fluorine-modified polymer roughness-reducing and protective coating suitable for hydraulic structures is prepared according to the following method: The polyurethane-modified epoxy resin, fluorocarbon resin, reactive diluent, silane coupling agent, carbon black, titanium dioxide, weather-resistant reinforcing filler, defoamer, and dispersant are first mixed to obtain component A; The alicyclic amine, phenolic amine, hydrophobic agent and epoxy accelerator are mixed in a second step to obtain component B; The first mixing is carried out under grinding conditions; the grinding is ball milling, and the ball milling time is 4~6 hours.

2. The fluorine-modified polymer roughness-reducing and protective coating for hydraulic structures according to claim 1, characterized in that, The active diluent is 1,4-cyclohexanediethanol diglycidyl ether.

3. The fluorine-modified polymer roughness-reducing and protective coating for hydraulic structures according to claim 1, characterized in that, The silane coupling agent is γ-(2,3-epoxypropoxy)propyltrimethoxysilane coupling agent.

4. The fluorine-modified polymer roughness-reducing and protective coating for hydraulic structures according to claim 1, characterized in that, The weather-resistant reinforcing filler is alumina and / or quartz.

5. The fluorine-modified polymer roughness-reducing and protective coating for hydraulic structures according to claim 4, characterized in that, The alumina has an average particle size of 0.5~1μm; The average grain size of the quartz is 4~6μm.

6. The fluorine-modified polymer roughness-reducing and protective coating for hydraulic structures according to claim 1, characterized in that, The dispersant includes Ucarb 680U dispersant and Ucarb 730U dispersant; The mass ratio of the U-Carb 730U dispersant to the U-Carb 680U dispersant is 70:30 to 95:

5.

7. The fluorine-modified polymer roughness-reducing and protective coating for hydraulic structures according to claim 1, characterized in that, The epoxy accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

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