An epoxy asphalt coating material, a preparation method and application thereof

Abstract

The present application belongs to the technical field of coating, and particularly relates to an epoxy asphalt coating, a preparation method and application thereof. The epoxy asphalt coating comprises component A and component B; the component A comprises epoxy resin, asphalt, active diluent and additive; the active diluent comprises glycidyl ether containing two epoxy groups; the component B comprises modified amine curing agent. The components jointly act to make the epoxy asphalt coating have high solid content, easy construction, fast drying speed, and good waterproof performance and anticorrosion performance. The active diluent prepared by the reaction of p-xylyl alcohol and diglycidyl ether can greatly reduce the viscosity of the system, facilitating construction; meanwhile, the active diluent has a double epoxy group structure, can participate in the reaction of the system, accelerate the drying speed, and the rigid benzene ring structure can improve the mechanical properties.

Description

TECHNICAL FIELD

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

[0002] Epoxy asphalt coatings are mostly used in the field of containers, and have high requirements on corrosion resistance, waterproofness and the like. Traditional epoxy asphalt coatings are mostly solvent-based coatings, and contain a large amount of organic solvents, which can cause pollution to the environment and harm to the health of construction personnel, and the organic solvents are flammable and explosive, and safety accidents can easily occur in the construction process. Therefore, the demand for green and environmentally-friendly coatings is increasingly urgent.

[0003] High-solid epoxy asphalt coatings are one of the research directions of green and environmentally-friendly coatings, and compared with traditional solvent-based coatings, the high-solid coatings have many advantages, such as (1) low VOC content, small pollution to the environment; (2) high solid content, high dry film thickness after one-time spraying, time-saving, labor-saving and resource-saving; (3) good wetting and leveling property to the base, and strong anti-permeability and corrosion resistance of the coating. However, the high-solid coatings also have some deficiencies in actual use, such as high viscosity, the need to select a resin with low relative molecular mass to reduce the viscosity during formulation design, short pot life, special requirements on the pressure of the construction equipment and spraying machine during spraying and the like.

[0004] Epoxy resins and their cured products have excellent water resistance, solvent resistance, chemical resistance, acid and alkali resistance, and a wide range of optional molecular weight and molecular structure, and are widely used as a film-forming material with excellent performance in the field of coatings. However, in a high-solid and solvent-free coating system, a liquid epoxy resin with a small molecular weight often has the disadvantages of slow drying speed and short pot life, and a solid epoxy resin with a large molecular weight has the disadvantages of high viscosity and poor workability. Asphalt material, as a cheap waterproof and anticorrosive material, is also widely used in the field of coatings, but it also has the defects of softening at high temperature and brittle cracking at low temperature.

[0005] Therefore, it is of great significance to provide an epoxy asphalt coating with high solid content, easy construction, fast drying speed and good waterproofness and corrosion resistance. SUMMARY

[0006] The present application aims to solve one or more of the technical problems existing in the prior art, and at least provide a beneficial alternative. Specifically, the present application provides an epoxy asphalt coating with high solid content, easy construction, fast drying speed and good waterproofness and corrosion resistance.

[0007] The inventive concept of the present application: the epoxy asphalt coating of the present application comprises A component and B component; the A component comprises epoxy resin, asphalt, active diluent and auxiliary agent; the active diluent comprises glycidyl ether containing two epoxy groups; the B component comprises modified amine curing agent. The cooperation of each component makes the epoxy asphalt coating have high solid content, easy construction, fast drying speed, and good waterproof performance and corrosion resistance.

[0008] Therefore, the first aspect of the present application provides an epoxy asphalt coating.

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

[0010] The B component 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 type liquid epoxy resin, bisphenol F type liquid epoxy resin, phenolic epoxy resin, hyperbranched modified epoxy resin.

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

[0014] The p-xylylene glycol structure in the specific active diluent has good solubilization effect on both the epoxy resin and the asphalt, and the diglycidyl ether can also reduce the viscosity of the epoxy resin and the asphalt; the active diluent prepared by the reaction of the two can greatly reduce the viscosity of the system, facilitating construction; at the same time, the active 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.

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

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

[0017] Preferably, the auxiliary agent comprises at least one of dispersing agent, defoaming agent, leveling agent, anti-settling agent.

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

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

[0020] Further preferably, the auxiliary agent comprises a dispersant, an antifoaming agent, a leveling agent and an anti-settling agent, the A component further comprises a pigment and a filler; and the A component comprises, by mass percentage, 35-50% of an epoxy resin, 15-30% of asphalt, 1-15% of a pigment, 5-15% of a filler, 2-10% of an active diluent, 0.5-2% of a dispersant, 0.1-1% of an antifoaming agent, 0.1-1% of a leveling agent, and 0.5-1.5% of an anti-settling agent.

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

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

[0023] Preferably, the dispersant comprises a non-ionic high molecular dispersant.

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

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

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

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

[0028] The second aspect of the present application provides a preparation method of the epoxy asphalt coating according to the first aspect of the present application.

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

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

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

[0032] Preferably, the preparation process of the A component is specifically as follows: the epoxy resin, asphalt, dispersing agent, anti-settling agent, pigment and filler are mixed to obtain a pigment resin slurry; the pigment resin slurry is mixed with the active diluent; and finally the defoaming agent and leveling agent are added to obtain the A component.

[0033] Preferably, the preparation method of the active diluent is as follows: the p-xylyl alcohol and the diglycidyl ether are mixed and reacted to obtain the active diluent.

[0034] Preferably, the mixing of the p-xylyl alcohol and the diglycidyl ether further comprises adding a catalyst for mixing.

[0035] Preferably, the catalyst comprises boron trifluoride etherate.

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

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

[0038] The third aspect of the present application provides an application of the epoxy asphalt coating in the waterproof or anticorrosion field.

[0039] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0040] (1) The A component of the present application comprises an epoxy resin, asphalt, an active diluent and an additive; the active diluent comprises a diglycidyl ether containing two epoxy groups; and the B component comprises a modified amine curing agent. The components jointly act to make the epoxy asphalt coating have a high solid content, be easy to construct, have a fast drying speed, and have good waterproof performance and anticorrosion performance. The p-xylyl alcohol structure in the active diluent has a good dissolving effect on the epoxy resin and the asphalt, and the diglycidyl ether can also reduce the viscosity of the epoxy resin and the asphalt. The active diluent prepared by the reaction of the p-xylyl alcohol and the diglycidyl ether can greatly reduce the viscosity of the system and facilitate construction. Meanwhile, the active diluent has a double epoxy group structure and can participate in the reaction of the system to accelerate the drying speed, and the rigid benzene ring structure can improve the mechanical properties.

[0041] (2) The epoxy asphalt coating has high solid content, greater than or equal to 90%, which is much higher than the solid content of an environmental protection water-based coating and also higher than the solid content of a general solvent-based coating, so that one coating pass with high film thickness can be easily realized, the construction efficiency is greatly improved, and the number of coating passes is reduced.

[0042] (3) The epoxy asphalt coating does not add an organic solvent, has very low VOC content, less than 100 g / L, is harmless to the surrounding environment and construction personnel, and can be widely applied to places requiring corrosion and waterproofing, such as container chassis, petrochemical pipeline corrosion prevention, and sewage treatment station inner walls. DETAILED DESCRIPTION

[0043] In order to make the skilled in the art more clearly understand the technical solutions described in the present application, the following examples are given for illustration. It should be pointed out that the following examples do not constitute a limitation on the scope of protection required by the present application.

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

[0045] Example 1

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

[0047] The B component is a phenolic amine type epoxy curing agent 100%.

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

[0049] The liquid epoxy resin in the A component is Nanya 128 resin; the pigment is iron oxide red; the filler is mica powder; the dispersant is a polymer type dispersant, BYK-161 is selected; the defoaming agent is an organic silicon type defoaming agent, BYK-066 is selected; the leveling agent is an organic silicon type leveling agent, BYK-333 is selected; the anti-settling agent is a bentonite type, PB183 of Huawate is selected; and the phenolic amine type epoxy curing agent in the B component is selected from Shanghe TSG-9048.

[0050] The raw material for preparing the active diluent is p-xylyleneglycol 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) Liquid epoxy resin, asphalt, dispersant, anti-settling agent, pigment, filler are mixed and grinded to get pigment resin slurry;

[0054] (2) The pigment resin slurry is mixed with active diluent, then defoaming agent and leveling agent are added and mixed to get high solid modified epoxy asphalt coating A component;

[0055] (3) A component and B component are mixed according to the ratio to get epoxy asphalt coating.

[0056] The preparation method of the active diluent comprises the following steps:

[0057] The active diluent is obtained by adding p-xylyleneglycol and catalyst boron trifluoride ether in 1,6-hexanediol diglycidyl ether, the reaction temperature is 70℃, and the reaction time is 4h.

[0058] The molar ratio of p-xylyleneglycol to 1,6-hexanediol diglycidyl ether is 1:2, and the amount of boron trifluoride ether accounts for 0.3% of the sum of the mass of p-xylyleneglycol and 1,6-hexanediol diglycidyl ether.

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

[0060]

[0061] Example 2

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

[0063] Example 3

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

[0065] Example 4

[0066] The difference between Example 4 and Example 1 is that the active diluent in Example 4 is synthesized by reacting p-xylyleneglycol and resorcinol diglycidyl ether at a molar ratio of 1:2, and the others are the same as 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 Comparative Example 1 uses an equal amount of p-xylyleneglycol to replace the active diluent of Example 1, and the rest is the same as Example 1.

[0071] Comparative Example 2

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

[0073] Comparative Example 3

[0074] The difference between Comparative Example 3 and Example 1 is only that Comparative Example 3 does not add active diluent, and the rest is the same as Example 1.

[0075] Comparative Example 4

[0076] The difference between Comparative Example 4 and Example 1 is only that Comparative Example 4 uses an equal amount of bisphenol A to replace p-xylyleneglycol to participate in the reaction of Example 1, and the rest is the same as Example 1.

[0077] Performance test

[0078] The epoxy asphalt coatings of Examples 1-4 and Comparative Examples 1-4 are subjected to performance tests, and each test item is in accordance with 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 the epoxy asphalt coatings of Examples 1-4 and Comparative Examples 1-4

[0081] Test item 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 speed / 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 application has high solid content, good water resistance, salt spray resistance, impact resistance, and low viscosity, which can well meet the on-site construction performance, and has fast drying speed and long pot life.

[0083] The water resistance, salt fog resistance, solid content, impact resistance and drying speed of the epoxy asphalt coating of Comparative Example 1 are all reduced, and the viscosity is increased, because the p-xylyl alcohol is free in the system and does not participate in the reaction, and the performance is greatly reduced. The water resistance, salt fog resistance and impact resistance of the epoxy asphalt coating of Comparative Example 2 are all reduced, and the viscosity is significantly increased, which is not conducive to construction, because the long-chain diglycidyl ether participates in the reaction, reduces the crosslinking network density of the reaction of the epoxy resin and the curing agent, and affects the water resistance and salt fog resistance. Comparative Examples 1 and 2 show that the p-xylyl alcohol and the diglycidyl ether in the active diluent are indispensable, and the product after the reaction of the two is used as the active diluent, so that the epoxy asphalt coating has low viscosity, fast drying speed, long pot life, high solid content, good water resistance and salt fog resistance.

[0084] Comparative Example 3 does not contain the active diluent, so that the water resistance, salt fog resistance, impact resistance and pot life of the epoxy asphalt coating of Comparative Example 3 are all reduced, and the viscosity is significantly increased, which is not conducive to construction.

[0085] Comparative Example 4 uses an equal amount of bisphenol A to replace the p-xylyl alcohol of Example 1, so that the water resistance, salt fog resistance, impact resistance and pot life of the epoxy asphalt coating of Comparative Example 4 are all reduced, and the viscosity is significantly increased, which is not conducive to construction.

[0086] In summary, the active diluent prepared by the reaction of the p-xylyl alcohol and the diglycidyl ether can greatly reduce the viscosity of the epoxy asphalt system, has good construction performance, can meet the needs of on-site construction, and improves the water resistance and salt fog resistance, which is beneficial to corrosion prevention. At the same time, the active diluent has a double epoxy group structure, can participate in the system reaction, accelerates the drying speed, and the rigid benzene ring structure can improve the mechanical properties of the coating.

[0087] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. An epoxy asphalt coating, characterized in that, It includes component A and component B; component A includes epoxy resin, asphalt, reactive diluent and additives; The reactive diluent includes glycidyl ether containing two epoxy groups; Component B includes a modified amine curing agent; The preparation process of the active diluent is as follows: terephthalic acid, diglycidyl ether and catalyst are mixed and reacted to obtain the active diluent; The catalyst is boron trifluoride diethyl ether; The molar ratio of terephthalic acid and diglycidyl ether is 1:(1.6-2.5).

2. The epoxy asphalt coating according to claim 1, characterized in that, 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.

3. The epoxy asphalt coating according to claim 1, characterized in that, The epoxy resin includes at least one of bisphenol A type liquid epoxy resin, bisphenol F type 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 additives include at least one of dispersants, defoamers, leveling agents, and antisettling agents; and / or, component A further includes at least one of pigments and fillers.

5. The epoxy asphalt coating according to claim 4, characterized in that, The additives include dispersants, defoamers, leveling agents, and anti-settling agents. Component A further includes pigments and fillers. By mass percentage, component A comprises 32-55% epoxy resin, 14-33% asphalt, 1-16% pigment, 4.5-16% filler, 1.8-11% reactive 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 nonionic polymeric dispersant; and / or, the defoamer includes at least one of silicone defoamers and acrylate defoamers; and / or, the leveling agent includes at least one of silicone and acrylate copolymers; 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 1-6, 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 1-7, characterized in that, Includes the following steps: The raw material components of component A are mixed to obtain component A; The epoxy asphalt coating is obtained by mixing component A and component B.

9. The preparation method according to claim 8, characterized in that, The preparation process of component A is as follows: first, epoxy resin, asphalt, dispersant, anti-settling agent, pigment, and filler are mixed to obtain pigment resin slurry; then, the pigment resin slurry is mixed with an active diluent, and finally, defoamer and leveling agent are added to obtain component A.

10. The application of the epoxy bitumen coating according to any one of claims 1-7 in the field of waterproofing or corrosion protection.

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