Epoxy resin waterproof coating and its preparation method and application

Abstract

The present invention discloses an epoxy resin waterproof coating and its preparation method and application. The coating comprises an A component consisting of a modified bisphenol A epoxy resin, a modified bisphenol F epoxy resin, a diluent and a coupling agent, and a B component consisting of a curing agent, a modified curing agent and an accelerator, wherein the modified bisphenol A epoxy resin is prepared by modifying a bisphenol A type epoxy resin, and the modified bisphenol F epoxy resin is prepared by modifying a bisphenol F type epoxy resin. Compared with conventional concrete waterproof coatings, the epoxy resin waterproof coating of the present invention has the advantages of low viscosity, good curing effect under low temperature and humid conditions, high adhesion strength, high permeability, and green environmental protection. When used for waterproofing concrete, it can obtain a better waterproof effect and will not produce secondary pollution. At the same time, the coating can not only be firmly bonded to concrete, but also firmly bonded to other substrates, showing very good applicability, high use value and good application prospects.

Description

Technical Field

[0001] The present invention relates to a concrete waterproof coating, in particular to an epoxy resin waterproof coating and a preparation method and application thereof. Background Art

[0002] In response to the water seepage problem of concrete buildings, traditional waterproof coatings mainly form a protective film on the surface of the concrete building to block water from entering the interior of the concrete. However, since the coating does not have permeability and adhesion, once the protective water film is damaged, the entire waterproof surface will fail. Moreover, their service life is relatively short, generally not exceeding ten years, and their durability does not meet the current standards. At present, the waterproof coatings or slurries used are mainly polymer waterproof coatings. By applying waterproof coatings or slurries on the seepage points or seepage surfaces and infiltrating the waterproof coatings or slurries into the interior of the concrete, a waterproof coating is formed, thereby blocking the water vapor channels inside the concrete and achieving waterproofing of the concrete. However, there is a water volatilization problem in the film-forming process of existing polymer waterproof coatings, which causes the coating to shrink and crack after the water evaporates, and it cannot play a waterproof role. Moreover, non-cured rubber asphalt will volatilize toxic and harmful substances during the heating process and the construction process, which will also cause secondary pollution to the environment. In addition, existing concrete waterproof coatings also have the defect of poor permeability. Since the coating is difficult to effectively enter the interior of the concrete, the air and water channels inside the concrete are difficult to be effectively blocked. Furthermore, existing concrete waterproofing coatings suffer from weak adhesion, preventing them from firmly bonding to other substrates, such as water pipes and drainage pipes, a key source of water leakage in buildings. Therefore, developing a waterproofing coating with high adhesion and permeability is crucial for effectively addressing concrete waterproofing issues. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an epoxy resin waterproof coating with high adhesion strength and high permeability, as well as a preparation method and application thereof.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] An epoxy resin waterproof coating comprises component A and component B;

[0006] The A component comprises the following raw material components in terms of weight percentage:

[0007]

[0008] The B component comprises the following raw material components in terms of weight percentage:

[0009] Curing agent 53%~59%,

[0010] Modified curing agent 39%~43%,

[0011] The accelerator is 2% to 6%, and the sum of the weight percentages of the raw materials is 100%;

[0012] The modified bisphenol A epoxy resin is prepared by mixing a copolymer of bisphenol A epoxy resin, hexamethylene diisocyanate and polyether polyol; the modified bisphenol F epoxy resin is prepared by mixing trimethylolpropane triglycidyl ester and bisphenol F epoxy resin.

[0013] The above-mentioned epoxy resin waterproof coating is further improved, and the epoxy equivalent of the modified bisphenol A epoxy resin is 236g / mol to 257g / mol.

[0014] The above-mentioned epoxy resin waterproof coating is further improved, and the copolymer of hexamethylene diisocyanate and polyether polyol is prepared by the following method: heating the polyether polyol to 25°C to 35°C, adding hexamethylene diisocyanate dropwise, completing the addition within 3 hours, and continuing the reaction for 2 hours to obtain a copolymer of hexamethylene diisocyanate and polyether polyol.

[0015] The above epoxy resin waterproof coating is further improved in that the weight ratio of the polyether polyol to hexamethylene diisocyanate is 36-37:13-14; and the weight average molecular weight of the polyether polyol is ≤800.

[0016] The above-mentioned epoxy resin waterproof coating is further improved in that the mass ratio of trimethylolpropane triglycidyl ester to bisphenol F epoxy resin is 26-31:69-74.

[0017] The above-mentioned epoxy resin waterproof coating is further improved, wherein the diluent is at least one of AGE, 1.4-butanediol diglycidyl ether, and phenyl glycidyl ether.

[0018] The above-mentioned epoxy resin waterproof coating is further improved, wherein the coupling agent is at least one of KH560 and KH570;

[0019] The above-mentioned epoxy resin waterproof coating is further improved, wherein the curing agent is at least one of diethylenetriamine, triethylenetetramine, 1.3-BAC, and polyetheramine; and the polyetheramine is D230.

[0020] The above-mentioned epoxy resin waterproof coating is further improved, wherein the modified curing agent is a fatty amine modified curing agent.

[0021] The above-mentioned epoxy resin waterproof coating is further improved, and the aliphatic amine modified curing agent is prepared by the following method: adding an alicyclic amine to a reactor, adjusting the temperature to 32°C to 36°C, adding a diluent dropwise, completing the dropwise addition over 3 to 4 hours, adjusting the temperature to 38°C to 42°C and continuing the reaction for 2 hours to obtain an alicyclic amine modified curing agent; the equivalent ratio of the alicyclic amine to the diluent is 2.8 to 3.2:1; the diluent is a mixture of 1,4-butanediol diglycidyl ether and AGE; and the weight ratio of the 1,4-butanediol diglycidyl ether to AGE is 5 to 7:13 to 15.

[0022] The above epoxy resin waterproof coating is further improved, wherein the accelerator is a mixture of benzyl alcohol and salicylic acid; the weight ratio of the benzyl alcohol to salicylic acid is 13-14:6-7.

[0023] The above-mentioned epoxy resin waterproof coating is further improved, and the weight ratio of the component A to the component B is 3.85-4.15:1.

[0024] As a general technical concept, the present invention also provides a method for preparing the above-mentioned epoxy resin waterproof coating, comprising the following steps:

[0025] S1. Heat the modified bisphenol A epoxy resin to 50° C. to 60° C., add the modified bisphenol F epoxy resin, diluent, and coupling agent in sequence, and stir to obtain component A; add the modified curing agent and accelerator to the curing agent in sequence, adjust the temperature to 35° C. to 40° C., and stir to obtain component B;

[0026] S2. Mix component A and component B to obtain an epoxy resin waterproof coating.

[0027] The above preparation method is further improved in that, during the preparation of component A, the stirring time is 50 min to 70 min.

[0028] The above preparation method is further improved in that, during the preparation of the component B, the stirring time is 50 min to 70 min.

[0029] As a general technical concept, the present invention also provides an application of the above-mentioned epoxy resin waterproof coating or the epoxy resin waterproof coating prepared by the above-mentioned preparation method in concrete waterproofing.

[0030] Compared with the prior art, the advantages of the present invention are:

[0031] (1) Aiming at the shortcomings of existing concrete waterproof coatings such as low adhesion strength and low permeability, and the resulting defects of poor waterproof effect of the coating and difficulty in long-term waterproofing, the present invention creatively provides an epoxy resin waterproof coating, wherein the main function of trimethylolpropane triglycidyl ester used in component A is to reduce viscosity, improve weather resistance, increase reaction activity, and increase the temperature of the reaction system through rapid heat release in the early stage of the reaction. Bisphenol F epoxy resin has the advantages of low viscosity, small molecular steric hindrance, and dense structure after reaction with curing agent. That is, trimethylolpropane triglycidyl ester, bisphenol F epoxy resin, and diluent are key materials for reducing viscosity and improving adhesion strength and permeability; the curing agent used in component B is a material with low viscosity and low surface tension, so by optimizing the raw materials in components A and B, The material type and the amount of each raw material can react under the joint action of modified bisphenol A epoxy resin, modified bisphenol F epoxy resin, diluent, curing agent, coupling agent, and accelerator to generate an insoluble and infusible polymer network structure solidified product. At the same time, the waterproof coating has the advantages of low viscosity, good curing effect under low temperature and humid conditions, high adhesion strength, and high permeability, so that the coating can effectively penetrate into the capillaries and gaps of concrete and form a strong and dense solidified body in the concrete, thereby effectively blocking the channels for water or air to enter the concrete and achieving the purpose of waterproofing. More importantly, the coating of the present invention can not only firmly adhere to concrete, but also firmly adhere to other substrates, thereby solving the problem of water seepage in the concrete itself, and solving the problem of water seepage between concrete and other substrates. In particular, when the mass ratio of trimethylolpropane triglycidyl ester to bisphenol F epoxy resin is too small, the viscosity decreases significantly, the reaction releases little heat, and the temperature of the system is difficult to increase. Therefore, the reaction effect at low temperatures is small, that is, the low-temperature reaction performance cannot meet the requirements; and when the mass ratio of trimethylolpropane triglycidyl ester to bisphenol F epoxy resin is too high, the reaction speed is too fast, the viscosity of the system increases quickly, and the comprehensive strength does not meet the target requirements. Compared with conventional concrete waterproof coatings, the epoxy resin waterproof coating of the present invention has the following advantages: (a) high adhesion strength, by mixing component A and component B, concrete buildings can be waterproofed, especially the contact surface or contact point between concrete and other substrates can be waterproofed, and the waterproof effect is excellent; (b) high permeability, can be cured under low temperature and humid conditions, so under the joint action of component A and component B, durable waterproofing of the waterproof joints of concrete buildings can be achieved, and the defects of conventional epoxy adhesives with harsh use conditions (such as the need for drying) can be overcome; (c) low viscosity, easy to expand and penetrate into the capillaries and gaps on the surface and inside of concrete, can achieve deep penetration into concrete under reasonable time conditions, does not fall off or peel after curing, and has strong waterproof ability; (d) no small molecules are generated, and no volatile substances are produced, which is more green and environmentally friendly; (f) moderate curing time and simple construction.

[0032] (2) In the present invention, by optimizing the weight ratio of polyether polyol to hexamethylene diisocyanate to 36-37:13-14, it is more conducive to obtaining a modified bisphenol A epoxy resin with a moderate reaction rate. This is because when the weight ratio is too small, the amount of polyether polyol used is small, the isocyanate content is high, and the reaction speed is too fast and difficult to control; and when the weight ratio is too large, due to the large amount of polyether polyol used, the isocyanate content is low, the reaction rate is low, and the target function cannot be achieved. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0034] The raw materials and instruments used in the following examples are all commercially available; the equipment and preparation processes used are all conventional equipment and conventional processes unless otherwise specified.

[0035] Example 1

[0036] An epoxy resin waterproof coating comprises a component A and a component B, wherein the component A comprises the following raw material components in percentage by weight:

[0037]

[0038] In component B, the following raw material components are included in percentage by weight:

[0039] Curing agent 59%,

[0040] Modified curing agent 39%,

[0041] Accelerator 2%.

[0042] In this embodiment, the modified bisphenol A epoxy resin used has an epoxy equivalent of 236 g / mol to 257 g / mol and is prepared by mixing a copolymer of bisphenol A epoxy resin, hexamethylene diisocyanate, and polyether polyol, comprising the following steps:

[0043] According to the weight ratio of polyether polyol to hexamethylene diisocyanate of 73:37, polyether polyol with a weight average molecular weight of 400 was added to a three-necked flask, the temperature was controlled at 25°C ~ 35°C, and hexamethylene diisocyanate was added dropwise. The addition was completed within 3 hours, and the reaction was continued for 2 hours to obtain a copolymer of hexamethylene diisocyanate and polyether polyol.

[0044] In this embodiment, the modified bisphenol F epoxy resin is prepared by mixing trimethylolpropane triglycidyl ester and bisphenol F epoxy resin, wherein the mass ratio of trimethylolpropane triglycidyl ester to bisphenol F epoxy resin is 29:71.

[0045] In this embodiment, the diluent used is phenyl glycidyl ether. Other diluents, such as AGE and 1,4-butanediol diglycidyl ether, can also be used in the present invention.

[0046] In this embodiment, the coupling agent used is KH560. Other coupling agents, such as KH570, can also be used in the present invention.

[0047] In this embodiment, the curing agent used is polyetheramine, wherein the polyetheramine is D230. Other curing agents, such as diethylenetriamine, triethylenetetramine, and 1.3-BAC, can also be used in the present invention.

[0048] In this embodiment, the modified curing agent used is an aliphatic amine modified curing agent, wherein the aliphatic amine modified curing agent is prepared by the following method: according to the equivalent ratio of alicyclic amine to diluent of 3:1, alicyclic amine (the alicyclic amine is 1,3-cyclohexanedimethylamine, but not limited to this) is added to the reactor, the temperature is adjusted to 32°C to 36°C, the diluent is added dropwise, and the addition is completed over 3 hours to 4 hours. The temperature is adjusted to 38°C to 42°C and the reaction is continued for 2 hours to obtain the alicyclic amine modified curing agent, wherein the diluent is a mixture of 1,4-butanediol diglycidyl ether and AGE, and the weight ratio of 1,4-butanediol diglycidyl ether to AGE is 31:69.

[0049] In this embodiment, the accelerator used is a mixture of benzyl alcohol and salicylic acid, wherein the weight ratio of benzyl alcohol to salicylic acid is 67:33.

[0050] In this embodiment, the weight ratio of component A to component B is 4:1.

[0051] A method for preparing the epoxy resin waterproof coating in the above embodiment comprises the following steps:

[0052] S1. Heat the modified bisphenol A epoxy resin to 50°C to 60°C, weigh 48.0g of modified bisphenol A epoxy resin and add it to a three-necked flask, turn on the stirrer, add 36.0g of modified bisphenol F epoxy resin, 10.0g of diluent, and 6.0g of coupling agent in sequence, and stir for 60min to obtain component A; add 59.0g of curing agent, 39.0g of modified curing agent and 2.0g of accelerator in sequence to the three-necked flask, adjust the temperature to 35°C to 40°C, and stir for 60min to obtain component B.

[0053] S2. Mix component A and component B in a weight ratio of 4:1 to obtain an epoxy resin waterproof coating.

[0054] The application of the epoxy resin waterproof coating prepared in the above embodiment in concrete waterproofing is specifically to apply the epoxy resin waterproof coating prepared in this embodiment to the surface of concrete (water content of 13%), and the waterproof node between the concrete and the water supply pipe (made of PVC), that is, the test object is concrete embedded with a water supply pipe, and it is cured under 25°C and heating (40-70°C) conditions. The results show that after curing under 25°C and heating conditions, the adhesive layer does not shrink or crack, and meets the requirements of concrete building waterproofing; in addition, the performance of related products is tested, and the results are shown in Tables 1-3.

[0055] Example 2

[0056] An epoxy resin waterproof coating comprises a component A and a component B, wherein the component A comprises the following raw material components in percentage by weight:

[0057]

[0058]

[0059] In component B, the following raw material components are included in percentage by weight:

[0060] Curing agent 53%,

[0061] Modified curing agent 42%,

[0062] Accelerator 5%.

[0063] In this embodiment, the modified bisphenol A epoxy resin used has an epoxy equivalent of 236 g / mol to 257 g / mol and is prepared by mixing a copolymer of bisphenol A epoxy resin, hexamethylene diisocyanate, and polyether polyol, comprising the following steps:

[0064] According to the weight ratio of polyether polyol to hexamethylene diisocyanate of 73:37, polyether polyol with a weight average molecular weight of 400 was added to a three-necked flask, the temperature was controlled at 25°C ~ 35°C, and hexamethylene diisocyanate was added dropwise. The addition was completed within 3 hours, and the reaction was continued for 2 hours to obtain a copolymer of hexamethylene diisocyanate and polyether polyol.

[0065] In this embodiment, the modified bisphenol F epoxy resin is prepared by mixing trimethylolpropane triglycidyl ester and bisphenol F epoxy resin, wherein the mass ratio of trimethylolpropane triglycidyl ester to bisphenol F epoxy resin is 29:71.

[0066] In this embodiment, the diluent used is phenyl glycidyl ether. Other diluents, such as AGE and 1,4-butanediol diglycidyl ether, can also be used in the present invention.

[0067] In this embodiment, the coupling agent used is KH560. Other coupling agents, such as KH570, can also be used in the present invention.

[0068] In this embodiment, the curing agent used is polyetheramine, wherein the polyetheramine is D230. Other curing agents, such as diethylenetriamine, triethylenetetramine, and 1.3-BAC, can also be used in the present invention.

[0069] In this embodiment, the modified curing agent used is an aliphatic amine modified curing agent, wherein the aliphatic amine modified curing agent is prepared by the following method: according to the equivalent ratio of alicyclic amine to diluent of 3:1, alicyclic amine (the alicyclic amine is 1,3-cyclohexanedimethylamine, but not limited to this) is added to the reactor, the temperature is adjusted to 32°C to 36°C, the diluent is added dropwise, and the addition is completed over 3 hours to 4 hours. The temperature is adjusted to 38°C to 42°C and the reaction is continued for 2 hours to obtain the alicyclic amine modified curing agent, wherein the diluent is a mixture of 1,4-butanediol diglycidyl ether and AGE, and the weight ratio of 1,4-butanediol diglycidyl ether to AGE is 31:69.

[0070] In this embodiment, the accelerator used is a mixture of benzyl alcohol and salicylic acid, wherein the weight ratio of benzyl alcohol to salicylic acid is 67:33.

[0071] In this embodiment, the weight ratio of component A to component B is 4:1.

[0072] A method for preparing the epoxy resin waterproof coating in the above embodiment comprises the following steps:

[0073] S1. Heat the modified bisphenol A epoxy resin to 50°C to 60°C, weigh 42.0g of modified bisphenol A epoxy resin and add it to a three-necked flask, turn on the stirrer, add 39.0g of modified bisphenol F epoxy resin, 14.0g of diluent, and 5.0g of coupling agent in sequence, and stir for 60min to obtain component A; add 53.0g of curing agent, 42.0g of modified curing agent and 5.0g of accelerator in sequence to the three-necked flask, adjust the temperature to 35°C to 40°C, and stir for 60min to obtain component B.

[0074] S2. Mix component A and component B in a weight ratio of 4:1 to obtain an epoxy resin waterproof coating.

[0075] The application of the epoxy resin waterproof coating prepared in the above embodiment in concrete waterproofing is specifically to apply the epoxy resin waterproof coating prepared in this embodiment to the surface of concrete (water content of 13%), and the waterproof node between the concrete and the water supply pipe (made of PVC), that is, the test object is concrete embedded with a water supply pipe, and it is cured under 25°C and heating (40-70°C) conditions. The results show that after curing under 25°C and heating conditions, the adhesive layer does not shrink or crack, and meets the requirements of concrete building waterproofing; in addition, the performance of related products is tested, and the results are shown in Tables 1-3.

[0076] Example 3

[0077] An epoxy resin waterproof coating comprises a component A and a component B, wherein the component A comprises the following raw material components in percentage by weight:

[0078]

[0079] In component B, the following raw material components are included in percentage by weight:

[0080] Curing agent 56%,

[0081] Modified curing agent 41%,

[0082] Accelerator 3%.

[0083] In this embodiment, the modified bisphenol A epoxy resin used has an epoxy equivalent of 236 g / mol to 257 g / mol and is prepared by mixing a copolymer of bisphenol A epoxy resin, hexamethylene diisocyanate, and polyether polyol, comprising the following steps:

[0084] According to the weight ratio of polyether polyol to hexamethylene diisocyanate of 73:37, polyether polyol with a weight average molecular weight of 400 was added to a three-necked flask, the temperature was controlled at 25°C ~ 35°C, and hexamethylene diisocyanate was added dropwise. The addition was completed within 3 hours, and the reaction was continued for 2 hours to obtain a copolymer of hexamethylene diisocyanate and polyether polyol.

[0085] In this embodiment, the modified bisphenol F epoxy resin is prepared by mixing trimethylolpropane triglycidyl ester and bisphenol F epoxy resin, wherein the mass ratio of trimethylolpropane triglycidyl ester to bisphenol F epoxy resin is 29:71.

[0086] In this embodiment, the diluent used is phenyl glycidyl ether. Other diluents, such as AGE and 1,4-butanediol diglycidyl ether, can also be used in the present invention.

[0087] In this embodiment, the coupling agent used is KH560. Other coupling agents, such as KH570, can also be used in the present invention.

[0088] In this embodiment, the curing agent used is polyetheramine, wherein the polyetheramine is D230. Other curing agents, such as diethylenetriamine, triethylenetetramine, and 1.3-BAC, can also be used in the present invention.

[0089] In this embodiment, the modified curing agent used is an aliphatic amine modified curing agent, wherein the aliphatic amine modified curing agent is prepared by the following method: according to the equivalent ratio of alicyclic amine to diluent of 3:1, alicyclic amine (the alicyclic amine is 1,3-cyclohexanedimethylamine, but not limited to this) is added to the reactor, the temperature is adjusted to 32°C to 36°C, the diluent is added dropwise, and the addition is completed over 3 hours to 4 hours. The temperature is adjusted to 38°C to 42°C and the reaction is continued for 2 hours to obtain the alicyclic amine modified curing agent, wherein the diluent is a mixture of 1,4-butanediol diglycidyl ether and AGE, and the weight ratio of 1,4-butanediol diglycidyl ether to AGE is 31:69.

[0090] In this embodiment, the accelerator used is a mixture of benzyl alcohol and salicylic acid, wherein the weight ratio of benzyl alcohol to salicylic acid is 67:33.

[0091] In this embodiment, the weight ratio of component A to component B is 4:1.

[0092] A method for preparing the epoxy resin waterproof coating in the above embodiment comprises the following steps:

[0093] S1. Heat the modified bisphenol A epoxy resin to 50°C to 60°C, weigh 45.0g of modified bisphenol A epoxy resin and add it to a three-necked flask, turn on the stirrer, add 37.0g of modified bisphenol F epoxy resin, 15.0g of diluent, and 3.0g of coupling agent in sequence, and stir for 60min to obtain component A; add 56.0g of curing agent, 41.0g of modified curing agent and 3.0g of accelerator in sequence to the three-necked flask, adjust the temperature to 35°C to 40°C, and stir for 60min to obtain component B.

[0094] S2. Mix component A and component B in a weight ratio of 4:1 to obtain an epoxy resin waterproof coating.

[0095] The application of the epoxy resin waterproof coating prepared in the above embodiment in concrete waterproofing is specifically to apply the epoxy resin waterproof coating prepared in this embodiment to the surface of concrete (water content of 13%), and the waterproof node between the concrete and the water supply pipe (made of PVC), that is, the test object is concrete embedded with a water supply pipe, and it is cured under 25°C and heating (40-70°C) conditions. The results show that after curing under 25°C and heating conditions, the adhesive layer does not shrink or crack, and meets the requirements of concrete building waterproofing; in addition, the performance of related products is tested, and the results are shown in Tables 1-3.

[0096] Comparative Example 1

[0097] An epoxy resin waterproof coating is substantially the same as Example 3, except that in Comparative Example 1, component A includes the following raw material components by weight percentage:

[0098]

[0099] In component B, the following raw material components are included in percentage by weight:

[0100] Curing agent 65%,

[0101] Modified curing agent 32%,

[0102] Accelerator 3%.

[0103] The application of the epoxy resin waterproof coating prepared in the above-mentioned comparative example 1 in concrete waterproofing is specifically to apply the epoxy resin waterproof coating prepared in comparative example 1 to the surface of concrete (water content is 13%), and the waterproof node between the concrete and the water supply pipe (made of PVC), that is, the test object is concrete embedded with a water supply pipe, and it is cured under 25°C and heating (40-70°C) conditions. The results show that after curing under 25°C and heating conditions, the adhesive layer does not shrink or crack, but is easy to fall off, which cannot meet the requirements of concrete building waterproofing; in addition, the performance of related products is tested, and the results are shown in Tables 1-3.

[0104] Comparative Example 2

[0105] An epoxy resin waterproof coating is substantially the same as Example 3, except that in Comparative Example 2, component A includes the following raw material components by weight percentage:

[0106]

[0107] In component B, the following raw material components are included in percentage by weight:

[0108] Curing agent 53%,

[0109] Modified curing agent 45%,

[0110] Accelerator 2%.

[0111] The application of the epoxy resin waterproof coating prepared in the above-mentioned comparative example 2 in concrete waterproofing is specifically to apply the epoxy resin waterproof coating prepared in comparative example 2 to the surface of concrete (water content is 13%), and the waterproof node between the concrete and the water supply pipe (made of PVC), that is, the test object is concrete embedded with a water supply pipe, and it is cured at 25°C and heating conditions. The results show that after curing at 25°C and heating conditions, the adhesive layer does not shrink or crack, but is easy to fall off, which cannot meet the requirements of concrete building waterproofing; in addition, the performance of related products is tested, and the results are shown in Tables 1-3.

[0112] Comparative Example 3

[0113] An epoxy resin waterproof coating is substantially the same as Example 3, except that in Comparative Example 3, component A includes the following raw material components by weight percentage:

[0114]

[0115] In component B, the following raw material components are included in percentage by weight:

[0116] Curing agent 48%,

[0117] Modified curing agent 46%,

[0118] Accelerator 6%.

[0119] The application of the epoxy resin waterproof coating prepared in the above-mentioned comparative example 3 in concrete waterproofing is specifically to apply the epoxy resin waterproof coating prepared in comparative example 3 to the surface of concrete (water content is 13%), and the waterproof node between the concrete and the water supply pipe (made of PVC), that is, the test object is concrete embedded with a water supply pipe, and it is cured at 25°C and heating conditions. The results show that after curing at 25°C and heating conditions, the adhesive layer does not shrink or crack, but is easy to fall off, which cannot meet the requirements of concrete building waterproofing; in addition, the performance of related products is tested, and the results are shown in Tables 1-3.

[0120] Comparative Example 4

[0121] An epoxy resin waterproof coating is substantially the same as Example 3, except that in Comparative Example 4, component A includes the following raw material components by weight percentage:

[0122]

[0123] In component B, the following raw material components are included in percentage by weight:

[0124] Curing agent 56%,

[0125] Modified curing agent 41%,

[0126] Accelerator 3%.

[0127] The application of the epoxy resin waterproof coating prepared in the above-mentioned comparative example 4 in concrete waterproofing is specifically to apply the epoxy resin waterproof coating prepared in comparative example 4 to the surface of concrete (water content is 13%), and the waterproof node between the concrete and the water supply pipe (made of PVC), that is, the test object is concrete embedded with a water supply pipe, and it is cured at 25°C and heating conditions. The results show that after curing at 25°C and heating conditions, the adhesive layer does not shrink or crack, but is easy to fall off, which cannot meet the requirements of concrete building waterproofing; in addition, the performance of related products is tested, and the results are shown in Tables 1-3.

[0128] Comparative Example 5

[0129] An epoxy resin waterproof coating is substantially the same as Example 3, except that in Comparative Example 5, component A includes the following raw material components by weight percentage:

[0130]

[0131] In component B, the following raw material components are included in percentage by weight:

[0132] Curing agent 56%,

[0133] Modified curing agent 41%,

[0134] Accelerator 3%.

[0135] The application of the epoxy resin waterproof coating prepared in the above-mentioned comparative example 5 in concrete waterproofing is specifically to apply the epoxy resin waterproof coating prepared in comparative example 5 to the surface of concrete (water content is 13%), and the waterproof node between the concrete and the water supply pipe (made of PVC), that is, the test object is concrete embedded with a water supply pipe, and it is cured at 25°C and heating conditions. The results show that after curing at 25°C and heating conditions, the adhesive layer does not shrink or crack, but is easy to fall off, which cannot meet the requirements of concrete building waterproofing; in addition, the performance of related products is tested, and the results are shown in Tables 1-3.

[0136] Table 1 Performance comparison of different epoxy resin waterproof coatings

[0137]

[0138] In Table 1, the test standards for viscosity, adhesion strength, and permeability are GB / T 2794, GB / T 5210, and JC / T2217, respectively.

[0139] As can be seen from Table 1, the epoxy resin waterproof coating prepared by the present invention has the advantages of low viscosity, good curing effect under low temperature and humid conditions, high adhesion strength, and high permeability. This shows that the epoxy resin waterproof coating of the present invention can effectively penetrate into the pores of concrete, and can also form a strong and dense solidified body in the pores of concrete, thereby achieving better waterproof effect.

[0140] Table 2 Durability test results of different solidified bodies at the waterproof joint between concrete and water pipe under the condition of curing temperature of 25℃

[0141]

[0142] In Table 2, the testing standard adopted is GB / T 19250-2013.

[0143] As can be seen from Table 2, the epoxy resin waterproof coating prepared by the present invention can maintain a high tensile strength regardless of whether it undergoes heat treatment, acid and alkali treatment, or long-term aging treatment. This shows that the epoxy resin waterproof coating of the present invention has very excellent durability when used for concrete waterproofing, and can achieve longer-term waterproofing.

[0144] Table 3 Test results of volatile components in different cured bodies obtained under the condition of curing temperature of 25°C

[0145]

[0146]

[0147] As can be seen from Table 3, when the epoxy resin waterproof coating prepared by the present invention is used for waterproofing concrete, various volatile components can meet relevant standards and are more environmentally friendly.

[0148] It can be seen from the above results that compared with conventional concrete waterproof coatings, the epoxy resin waterproof coating of the present invention has the following advantages: (a) high adhesion strength. By mixing component A and component B, concrete buildings can be waterproofed, especially the contact surface or contact point between concrete and other substrates can be waterproofed, and the waterproof effect is excellent; (b) high permeability. It can be cured under low temperature and humid conditions. Therefore, under the joint action of component A and component B, durable waterproofing of the waterproof nodes of concrete buildings can be achieved, and the defects of conventional epoxy adhesives with harsh use conditions (such as the need for drying) can be overcome; (c) low viscosity. It is easy to expand and penetrate into the capillaries and gaps on the surface and inside of concrete, and can achieve deep penetration into concrete under reasonable time conditions. After curing, it does not fall off or peel, and has strong waterproof ability; (d) no small molecules are generated, and no volatile substances are produced, which is more green and environmentally friendly; (f) moderate curing time and simple construction. More importantly, the epoxy resin waterproof coating of the present invention has very high adhesion strength. It can not only firmly adhere to concrete, but also firmly adhere to other substrates. Therefore, it can solve the problem of water seepage in the concrete itself, as well as the problem of water seepage between concrete and other substrates. It has high use value and good application prospects.

[0149] The above embodiments are merely preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of protection of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that can be made by a person skilled in the art without departing from the principles of the present invention are also considered to be within the scope of protection of the present invention.

Claims

1. An epoxy resin waterproof coating, characterized in that: It includes component A and component B; The A component comprises the following raw material components in terms of weight percentage: Modified bisphenol A epoxy resin 42% to 48%, Modified bisphenol F epoxy resin 35% to 39%, Diluent 10% to 15%, The coupling agent is 3% to 7%, and the sum of the weight percentages of all raw materials is 100%; The B component comprises the following raw material components in terms of weight percentage: Curing agent 53%~59%, Modified curing agent 39%~43%, The accelerator is 2% to 6%, and the sum of the weight percentages of all raw materials is 100%; The modified bisphenol A epoxy resin is prepared by mixing a copolymer of bisphenol A epoxy resin, hexamethylene diisocyanate and polyether polyol; the weight ratio of the polyether polyol to the hexamethylene diisocyanate is 36-37:13-14; the modified bisphenol F epoxy resin is prepared by mixing trimethylolpropane triglycidyl ester and bisphenol F epoxy resin; the mass ratio of trimethylolpropane triglycidyl ester to bisphenol F epoxy resin is 26-31:69-74; the curing agent is at least one of diethylenetriamine, triethylenetetramine, 1.3-BAC and polyetheramine; the modified curing agent is an alicyclic amine modified curing agent; the alicyclic amine modified curing agent is prepared by the following method: adding an alicyclic amine to a reactor, adjusting the temperature to 32°C to 36°C, adding a diluent dropwise, completing the addition over 3 to 4 hours, adjusting the temperature to 38°C to 42°C and continuing the reaction for 2 hours to obtain the alicyclic amine modified curing agent.

2. The epoxy resin waterproof coating according to claim 1, wherein The epoxy equivalent of the modified bisphenol A epoxy resin is 236 g / mol to 257 g / mol.

3. The epoxy resin waterproof coating according to claim 2, characterized in that: The copolymer of hexamethylene diisocyanate and polyether polyol is prepared by the following method: heating polyether polyol to 25° C. to 35° C., adding hexamethylene diisocyanate dropwise within 3 hours, and continuing the reaction for 2 hours to obtain the copolymer of hexamethylene diisocyanate and polyether polyol.

4. The epoxy resin waterproof coating according to claim 3, characterized in that: The weight average molecular weight of the polyether polyol is ≤800.

5. The epoxy resin waterproof coating according to any one of claims 1 to 4, characterized in that: The diluent is at least one of AGE, 1.4-butanediol diglycidyl ether, and phenyl glycidyl ether; The coupling agent is at least one of KH560 and KH570; The polyetheramine is D230; In the preparation method of the alicyclic amine modified curing agent, the equivalent ratio of the alicyclic amine to the diluent is 2.8-3.2:1, the diluent is a mixture of 1,4-butanediol diglycidyl ether and AGE, and the weight ratio of the 1,4-butanediol diglycidyl ether to AGE is 5-7:13-15; The accelerator is a mixture of benzyl alcohol and salicylic acid; the weight ratio of the benzyl alcohol to the salicylic acid is 13-14:6-7.

6. The epoxy resin waterproof coating according to any one of claims 1 to 4, characterized in that: The weight ratio of the component A to the component B is 3.85-4.15:

1.

7. A method for preparing the epoxy resin waterproof coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Heat the modified bisphenol A epoxy resin to 50° C. to 60° C., add the modified bisphenol F epoxy resin, diluent, and coupling agent in sequence, and stir to obtain component A; add the modified curing agent and accelerator to the curing agent in sequence, adjust the temperature to 35° C. to 40° C., and stir to obtain component B; S2. Mix component A and component B to obtain an epoxy resin waterproof coating.

8. The preparation method according to claim 7, wherein During the preparation of component A, the stirring time is 50 min to 70 min; During the preparation of the B component, the stirring time is 50 min to 70 min.

9. Use of the epoxy resin waterproof coating according to any one of claims 1 to 6 or the epoxy resin waterproof coating prepared by the preparation method according to claim 7 or 8 in concrete waterproofing.

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