Epoxy asphalt coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of coatings, and particularly relates to an epoxy asphalt coating as well as a preparation method and application thereof. The epoxy asphalt coating comprises a component A and a component B, the component A comprises epoxy resin, asphalt, a reactive diluent and an auxiliary agent; the reactive diluent comprises glycidyl ether containing two epoxy groups; the component B comprises a modified amine curing agent. Through the combined action of all the components, the epoxy asphalt coating is high in solid content, easy to construct, high in drying speed and good in waterproof performance and corrosion resistance. The reactive diluent is prepared by reacting terephthalyl alcohol and diglycidyl ether, so that the viscosity of the system can be greatly reduced, and the construction is convenient; meanwhile, the reactive diluent has a double epoxy group structure and can participate in system reaction, the drying speed is increased, and meanwhile the mechanical performance can be improved through a rigid benzene ring structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to an epoxy asphalt coating, a preparation method thereof, and an application thereof. Background Art

[0002] Epoxy asphalt coatings are mostly used in the container field and have high requirements for anti-corrosion, waterproof and other properties. Traditional epoxy asphalt coatings are mostly solvent-based coatings, containing a large amount of organic solvents, which will cause environmental pollution, harm the health of construction workers, and at the same time, organic solvents are inflammable and explosive, and safety accidents are extremely likely to occur during the construction process. Therefore, the demand for green and environmentally friendly coatings is becoming increasingly urgent.

[0003] High-solid epoxy asphalt coatings are one of the research directions of green and environmentally friendly coatings. Compared with traditional solvent-based coatings, high-solid coatings have many advantages, such as (1) low VOC content and little environmental pollution; (2) high solid content, high dry film thickness in one spray, saving time, labor and resources; (3) good wetting and leveling properties for the substrate, and strong anti-seepage and corrosion resistance of the coating, etc. However, high-solid coatings also have deficiencies in actual use, such as relatively high viscosity itself, relatively low molecular weight resins need to be selected in the formulation design to reduce the viscosity, resulting in a short pot life of the coating, and special requirements for the pressure of the construction equipment and spray machine during spraying, etc.

[0004] Epoxy resins and their cured products have excellent water resistance, solvent resistance, chemical resistance, acid and alkali resistance, and the molecular weight and molecular structure have a wide selection range. As a film-forming substance with excellent performance, it is widely used in the coating field. However, in high-solid and solvent-free coating systems, small molecular weight liquid epoxy resins often have the disadvantages of slow drying speed and short pot life, while large molecular weight solid epoxy resins have the disadvantages of high viscosity and poor workability. Asphalt materials, as an inexpensive waterproof and anti-corrosion material, are also widely used in the coating field, but they also have the defects of being easily softened at high temperatures and brittle at low temperatures.

[0005] Therefore, it is of great significance to provide an epoxy asphalt coating with high solid content, easy construction, fast drying speed, and good waterproof and anti-corrosion properties. Summary of the Invention

[0006] The present invention aims to solve one or more of the above-mentioned technical problems existing in the prior art and at least provide a beneficial choice. Specifically, the present invention provides an epoxy asphalt coating with high solid content, easy construction, fast drying speed, and good waterproof and anti-corrosion properties.

[0007] Inventive concept of the present invention: The epoxy asphalt coating of the present invention comprises Component A and Component B; Component A comprises epoxy resin, asphalt, active diluent and additives; the active diluent comprises glycidyl ether containing two epoxy groups; Component B comprises modified amine curing agent. The combined action of each component makes the epoxy asphalt coating have a high solid content, easy to construct, fast drying speed, and good waterproof and anti-corrosion properties.

[0008] Therefore, in the first aspect of the present invention, an epoxy asphalt coating is provided.

[0009] Specifically, the epoxy asphalt coating comprises Component A and Component B; Component A comprises epoxy resin, asphalt, active diluent and additives; the active diluent comprises glycidyl ether containing two epoxy groups;

[0010] Component B comprises modified amine curing agent.

[0011] Preferably, the active diluent comprises low-viscosity glycidyl ether containing two epoxy groups.

[0012] Preferably, the epoxy resin comprises at least one of bisphenol A liquid epoxy resin, bisphenol F liquid epoxy resin, phenolic epoxy resin, and hyperbranched modified epoxy resin.

[0013] The raw materials for preparing the active diluent comprise terephthalyl alcohol and diglycidyl ether; the diglycidyl ether comprises at least one of 1,6-hexanediol diglycidyl ether, 1,4-butanediol diglycidyl ether, resorcinol diglycidyl ether, and neopentyl glycol diglycidyl ether.

[0014] Specifically, the terephthalyl alcohol structure in the active diluent has a good dissolving effect on both epoxy resin and asphalt. At the same time, diglycidyl ether can also reduce the viscosity of epoxy resin and asphalt. The active diluent prepared by the reaction of the two can greatly reduce the system viscosity and facilitate construction; meanwhile, the active diluent has a double epoxy group structure and can participate in the system reaction to accelerate the drying speed, and the rigid benzene ring structure can improve the mechanical properties.

[0015] Preferably, the modified amine curing agent comprises at least one of phenolic amine epoxy curing agent, polyamide epoxy curing agent, and cycloaliphatic amine epoxy curing agent.

[0016] Preferably, the asphalt comprises at least one of soft asphalt and hard asphalt.

[0017] Preferably, the additives comprise at least one of dispersant, defoamer, leveling agent, and anti-settling agent.

[0018] Preferably, Component A further comprises at least one of pigment and filler.

[0019] Preferably, the additives include a dispersant, an antifoaming agent, a leveling agent, and an anti-settling agent. The component A further includes a pigment and a filler. By mass percentage, the component A includes 32-55% of epoxy resin, 14-33% of asphalt, 1-16% of pigment, 4.5-16% of filler, 1.8-11% of active diluent, 0.5-2.2% of dispersant, 0.1-1.1% of antifoaming agent, 0.1-1.1% of leveling agent, and 0.5-1.6% of anti-settling agent.

[0020] More preferably, the additives include a dispersant, an antifoaming agent, a leveling agent, and an anti-settling agent. The component A further includes a pigment and a filler. By mass percentage, the component A includes 35-50% of epoxy resin, 15-30% of asphalt, 1-15% of pigment, 5-15% of filler, 2-10% of active diluent, 0.5-2% of dispersant, 0.1-1% of antifoaming agent, 0.1-1% of leveling agent, and 0.5-1.5% of anti-settling agent.

[0021] Preferably, the pigment includes at least one of iron oxide black, iron oxide red, iron oxide yellow, titanium dioxide, zinc phosphate, and ion-exchange type pigment.

[0022] Preferably, the filler includes at least one of talc powder, barium sulfate, mica powder, calcined kaolin, and silica powder.

[0023] Preferably, the dispersant includes a non-ionic polymer dispersant.

[0024] Preferably, the antifoaming agent includes at least one of silicone antifoaming agent and acrylate antifoaming agent.

[0025] Preferably, the leveling agent includes at least one of silicone and acrylate copolymer.

[0026] Preferably, the anti-settling agent includes at least one of bentonite, fumed silica, and polyamide wax.

[0027] Preferably, the mass ratio of the component A to the component B is (4.5-15):1; more preferably, the mass ratio of the component A to the component B is (5-14):1.

[0028] The second aspect of the present invention provides a preparation method of the epoxy asphalt coating described in the first aspect of the present invention.

[0029] Specifically, the preparation method of the epoxy asphalt coating includes the following steps:

[0030] Mix the raw material components of the component A to obtain the component A;

[0031] Mix the component A and the component B to obtain the epoxy asphalt coating.

[0032] Preferably, the preparation process of the component A is as follows: first, mix the epoxy resin, asphalt, dispersant, anti-settling agent, pigment, and filler to obtain a pigment resin paste; then mix the pigment resin paste with the reactive diluent, and finally add the defoaming agent and leveling agent to obtain the component A.

[0033] Preferably, the preparation method of the reactive diluent is to mix the terephthalyl alcohol and diglycidyl ether and react to obtain the reactive diluent.

[0034] Preferably, when mixing the terephthalyl alcohol and diglycidyl ether, a catalyst is also added for mixing.

[0035] Preferably, the catalyst includes boron trifluoride ethyl ether.

[0036] Preferably, the molar ratio of the terephthalyl alcohol to the diglycidyl ether is 1:(1.6 - 2.5); further preferably, the molar ratio of the terephthalyl alcohol to the diglycidyl ether is 1:(1.8 - 2.2); still further preferably, the molar ratio of the terephthalyl alcohol to the diglycidyl ether is 1:2.

[0037] Preferably, the dosage of the catalyst accounts for 0.1 - 0.55% of the total mass of the terephthalyl alcohol and diglycidyl ether; further preferably, the dosage of the catalyst accounts for 0.1 - 0.5% of the total mass of the terephthalyl alcohol and diglycidyl ether.

[0038] The third aspect of the present invention provides an application of the epoxy asphalt coating described in the first aspect of the present invention in the field of waterproofing or anti-corrosion.

[0039] Compared with the prior art, the beneficial effects of the technical solution provided by the present invention are as follows:

[0040] (1) The component A of the present invention includes epoxy resin, asphalt, reactive diluent, and additives; the reactive diluent includes glycidyl ether containing two epoxy groups; the component B includes a modified amine curing agent. The combined action of each component makes the epoxy asphalt coating have a high solid content, easy to construct, fast drying speed, and good waterproof and anti-corrosion properties. The terephthalyl alcohol structure in the reactive diluent has a good dissolving effect on both epoxy resin and asphalt. At the same time, diglycidyl ether can also reduce the viscosity of epoxy resin and asphalt. The reactive diluent prepared by their reaction can greatly reduce the viscosity of the system, facilitating construction; at the same time, the reactive diluent has a double epoxy group structure, which can participate in the system reaction, accelerate the drying speed, and the rigid benzene ring structure can improve the mechanical properties.

[0041] (2) The epoxy asphalt coating of the present invention has a high solid content, greater than or equal to 90%, which is much higher than that of environmentally friendly waterborne coatings and also higher than that of general solvent-based coatings. It can easily achieve a high film thickness in one coat, greatly improving the construction efficiency and reducing the number of construction coats.

[0042] (3) The epoxy asphalt coating of the present invention does not add organic solvents and has a very low VOC content, less than 100 g / L, which is harmless to the surrounding environment and construction workers. It can be widely applied to places that require anti-corrosion and waterproofing, such as container bottoms, petrochemical pipelines, and the inner walls of sewage treatment plants, such as container chassis, petrochemical pipeline anti-corrosion, and the inner walls of sewage treatment plants. Detailed implementation manners

[0043] In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the following examples are listed for illustration. It should be noted that the following examples do not limit the scope of protection required by the present invention.

[0044] In the following examples, the raw materials, reagents or devices used, unless otherwise specified, can be obtained from conventional commercial channels or can be obtained by existing known methods.

[0045] Example 1

[0046] An epoxy asphalt coating, including component A and component B. By mass percentage, component A consists of 40% liquid epoxy resin, 20% asphalt, 15% pigment, 15% filler, 6.2% active diluent, 2% dispersant, 0.1% defoamer, 0.7% leveling agent, and 1% anti-settling agent;

[0047] Component B is 100% phenolic amine epoxy curing agent;

[0048] The mass ratio of component A to component B is 7:1.

[0049] Among them, the liquid epoxy resin in component A is Nanya 128 resin; the pigment is iron oxide red; the filler is mica powder; the dispersant is a polymer type dispersant, selected as BYK-161; the defoamer is a silicone type defoamer, selected as BYK-066; the leveling agent is a silicone type leveling agent, selected as BYK-333; the anti-settling agent is a bentonite type, selected as PB183 of Huate; the phenolic amine epoxy curing agent in component B is selected as Shanghe TSG-9048.

[0050] The preparation raw materials of the active diluent are p-xylene glycol and 1,6-hexanediol diglycidyl ether, and the structural formula of the active diluent is:

[0051]

[0052] The preparation method of the epoxy asphalt coating includes the following steps:

[0053] (1) Mix liquid epoxy resin, asphalt, dispersant, anti-settling agent, pigment, and filler, and conduct grinding treatment to obtain a pigment resin paste;

[0054] (2) Mix the pigment resin paste and active diluent evenly, then add defoamer and leveling agent and mix evenly to obtain Component A of the high solid content modified epoxy asphalt coating;

[0055] (3) Mix Component A and Component B in proportion to obtain an epoxy asphalt coating.

[0056] Among them, the preparation method of the active diluent includes the following steps:

[0057] Add terephthalyl alcohol and catalyst boron trifluoride diethyl ether to 1,6-hexanediol diglycidyl ether for reaction. The reaction temperature is 70 °C and the reaction time is 4 h to obtain the active diluent.

[0058] Among them, the molar ratio of terephthalyl alcohol to 1,6-hexanediol diglycidyl ether is 1:2, and the dosage of boron trifluoride diethyl ether accounts for 0.3% of the sum of the masses of terephthalyl alcohol and 1,6-hexanediol diglycidyl ether.

[0059] The reaction route of the active diluent is:

[0060]

[0061] Example 2

[0062] The difference between Example 2 and Example 1 is only that the liquid epoxy resin in Example 2 is the phenolic epoxy resin DER-353 of Qian'an, and the others are the same as in Example 1.

[0063] Example 3

[0064] The difference between Example 3 and Example 1 is only that the amine curing agent in Example 3 is the polyamide epoxy curing agent 460 of Guodu Chemical Industry, and the others are the same as in Example 1.

[0065] Example 4

[0066] The difference between Example 4 and Example 1 is only that the active diluent in Example 4 is synthesized by reacting terephthalyl alcohol and resorcinol diglycidyl ether in a molar ratio of 1:2, and the others are the same as in Example 1.

[0067] The reaction route of the active diluent in Example 4 is as follows:

[0068]

[0069] Comparative Example 1

[0070] The difference between Comparative Example 1 and Example 1 is only that in Comparative Example 1, an equal amount of terephthalyl alcohol is used to replace the active diluent in Example 1, and the others are the same as in Example 1.

[0071] Comparative Example 2

[0072] The difference between Comparative Example 2 and Example 1 is only that in Comparative Example 2, an equal amount of 1,6 - hexanediol diglycidyl ether is used to replace the active diluent in Example 1, and the others are the same as in Example 1.

[0073] Comparative Example 3

[0074] The difference between Comparative Example 3 and Example 1 is only that in Comparative Example 3, no active diluent is added, and the others are the same as in Example 1.

[0075] Comparative Example 4

[0076] The difference between Comparative Example 4 and Example 1 is only that in Comparative Example 4, an equal amount of bisphenol A is used to replace terephthalyl alcohol in Example 1 to participate in the reaction, and the others are the same as in Example 1.

[0077] Performance Test

[0078] The epoxy asphalt coatings of Examples 1 - 4 and Comparative Examples 1 - 4 were subjected to performance tests, and each test item was carried out with reference to the JH / TE05 - 2007 container asphalt paint standard.

[0079] The performance test results of the epoxy asphalt coatings of Examples 1 - 4 and Comparative Examples 1 - 4 are shown in Table 1.

[0080] Table 1: Performance Test Results of Epoxy Asphalt Coatings of Examples 1 - 4 and Comparative Examples 1 - 4

[0081] Test Items Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Solid Content (%) 96 96 96 96 90 96 97 96 Viscosity / cps / 25°C 12000 6000 15000 13000 15000 30000 60000 35000 Pot Life / h 2 2.5 1 1.5 3 1.5 0.5 1.5 Drying Rate / h 2 2 1.5 1.5 6 2 4 2 Impact Resistance / cm 50 50 45 55 40 30 35 30 Salt Spray Resistance / h 2000 2000 2000 2000 1000 1200 1300 1200 Water Resistance / h 5000 4500 5000 4000 1000 2000 2000 2000

[0082] As can be seen from Table 1, the epoxy asphalt coating prepared by the present invention has a high solid content, good water resistance, salt spray resistance, impact resistance, low viscosity, can well meet the on - site constructability, and at the same time has a fast drying speed and a long pot life.

[0083] In Comparative Example 1, an equal amount of terephthalyl alcohol was used to replace the reactive diluent in Example 1, resulting in a decrease in the water resistance, salt spray resistance, solid content, impact resistance, and drying rate of the epoxy asphalt coating in Comparative Example 1, and an increase in viscosity. This is because without glycidyl ether, terephthalyl alcohol is free in the system and does not participate in the reaction, thus greatly reducing the performance. In Comparative Example 2, an equal amount of 1,6-hexanediol diglycidyl ether was used to replace the reactive diluent in Example 1, resulting in a decrease in the water resistance, salt spray resistance, and impact resistance of the epoxy asphalt coating in Comparative Example 2, and a significant increase in viscosity, which is not conducive to construction. This is because without terephthalyl alcohol, the long-chain diglycidyl ether participates in the reaction, reducing the crosslinking network density of the reaction between epoxy resin and curing agent and affecting the water and salt spray resistance. Comparative Example 1 and Comparative Example 2 illustrate that both terephthalyl alcohol and diglycidyl ether in the reactive diluent are indispensable. Using the product after reacting the two as the reactive diluent can make the epoxy asphalt coating have low viscosity, fast drying rate, long pot life, high solid content, and good water and salt spray resistance.

[0084] Comparative Example 3 does not contain a reactive diluent, resulting in a decrease in the water resistance, salt spray resistance, impact resistance, and pot life of the epoxy asphalt coating in Comparative Example 3, and a significant increase in viscosity, which is not conducive to construction.

[0085] In Comparative Example 4, an equal amount of bisphenol A was used to replace the terephthalyl alcohol in Example 1, resulting in a decrease in the water resistance, salt spray resistance, impact resistance, and pot life of the epoxy asphalt coating in Comparative Example 4, and a significant increase in viscosity, which is not conducive to construction.

[0086] In summary, the reactive diluent prepared by reacting terephthalyl alcohol and diglycidyl ether in the present invention can greatly reduce the viscosity of the epoxy asphalt system, has good construction performance, and can meet the on-site construction needs; moreover, the water resistance and salt spray resistance are improved, which is beneficial to anti-corrosion; at the same time, the reactive diluent has a bis-epoxy group structure, can participate in the system reaction to accelerate the drying rate, and the rigid benzene ring structure can improve the mechanical properties of the coating.

[0087] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An epoxy asphalt coating, characterized in that: It comprises component A and component B; the component A comprises epoxy resin, asphalt, active diluent and additives; The reactive diluent includes a glycidyl ether containing two epoxy groups; The B component includes a modified amine curing agent.

2. The epoxy asphalt coating according to claim 1, characterized in that: The raw materials for preparing the active diluent include terephthalic acid and diglycidyl ether; the diglycidyl ether includes at least one of 1,6-hexanediol diglycidyl ether, 1,4-butanediol diglycidyl ether, resorcinol diglycidyl ether and neopentyl glycol diglycidyl ether.

3. The epoxy asphalt coating according to claim 1, characterized in that: The epoxy resin includes at least one of bisphenol A liquid epoxy resin, bisphenol F liquid epoxy resin, phenolic epoxy resin, and hyperbranched modified epoxy resin; and / or the modified amine curing agent includes at least one of phenolic amine epoxy curing agent, polyamide epoxy curing agent, and alicyclic amine epoxy curing agent.

4. The epoxy asphalt coating according to claim 1, characterized in that: The auxiliary agent includes at least one of a dispersant, a defoamer, a leveling agent, and an anti-settling agent; and / or the component A also includes at least one of a pigment and a filler.

5. The epoxy asphalt coating according to claim 4, characterized in that: The additives include dispersants, defoamers, leveling agents and anti-settling agents, and the A component also includes pigments and fillers. In terms of mass percentage, the A component includes 32-55% epoxy resin, 14-33% asphalt, 1-16% pigment, 4.5-16% filler, 1.8-11% active diluent, 0.5-2.2% dispersant, 0.1-1.1% defoamer, 0.1-1.1% leveling agent, and 0.5-1.6% anti-settling agent.

6. The epoxy asphalt coating according to claim 4, characterized in that: The filler includes at least one of talc, barium sulfate, mica powder, calcined kaolin and silica powder; and / or, the dispersant includes a non-ionic polymer dispersant; and / or, the defoamer includes at least one of an organosilicon defoamer and an acrylate defoamer; and / or, the leveling agent includes at least one of an organosilicon and an acrylate copolymer; and / or, the anti-settling agent includes at least one of bentonite, fumed silica and polyamide wax.

7. The epoxy asphalt coating according to any one of claims 1 to 6, characterized in that: The mass ratio of component A to component B is (4.5-15):

1.

8. The method for preparing the epoxy asphalt coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: Mixing the raw material components of component A to obtain component A; The component A and the component B are mixed to obtain the epoxy asphalt coating.

9. The preparation method according to claim 8, characterized in that: The preparation process of the A component is specifically as follows: firstly, the epoxy resin, asphalt, dispersant, anti-settling agent, pigment, and filler are mixed to obtain a pigment resin slurry; then, the pigment resin slurry is mixed with an active diluent, and finally, the defoamer and leveling agent are added to obtain the A component; And / or, the preparation process of the active diluent is to mix the terephthalic acid and diglycidyl ether, and react them to obtain the active diluent.

10. Use of the epoxy asphalt coating according to any one of claims 1 to 7 in the field of waterproofing or anti-corrosion.

Images