A hydrophilic epoxy resin waterproof coating, a preparation method and application thereof

Abstract

The application discloses a kind of hydrophilic epoxy resin waterproof coating and its preparation method and application, the coating includes by epoxy resin, modified epoxy resin, diluent and coupling agent component A, by curing agent, modified curing agent, accelerator component B, wherein modified epoxy resin is by octadecyl methacrylate with bisphenol A type epoxy resin after being mixed to obtain.Compared with conventional epoxy resin waterproof coating, the hydrophilic epoxy resin waterproof coating of the application has the following advantages: high permeability, more excellent waterproof performance is obtained, and construction is more simple;Wetting performance is good, can promote to improve the adhesion between coating and concrete, can obtain better and more long-lasting waterproof effect;It can be cured under low temperature and humid conditions;Easy to flow, it can realize the deep penetration of concrete under reasonable time conditions, no adhesive failure, strong waterproof ability, and reasonable operation time, easy to construction;Non-volatile, more green and environmental protection.

Description

Technical Field

[0001] This invention relates to a durable concrete waterproof coating, specifically to a hydrophilic epoxy resin waterproof coating, its preparation method, and its application. Background Technology

[0002] To address the water seepage problem in concrete structures, improving the hydrophilicity of waterproof coatings or slurries can enhance their adhesion to concrete, leading to a more robust and solidified layer within the concrete, thus strengthening its waterproofing effect. Existing concrete waterproof coatings are primarily water-based, such as polymer cement waterproof coatings, polymer emulsion building waterproof coatings, and water-emulsion asphalt waterproof coatings. Because these coatings contain solvents or water, the resulting waterproofing coating is prone to seepage after evaporation, or has poor waterproofing performance. Furthermore, during use, volatile components in these coatings can evaporate into the environment, potentially causing secondary pollution. Additionally, existing epoxy resin waterproof coatings suffer from low solids content, high viscosity, the presence of volatile components, and poor hydrophilicity. This results in poor adhesion between the coating and concrete, making it difficult to form a tight and strong coating within the concrete, ultimately failing to meet waterproofing requirements, particularly in maintaining a good waterproofing effect over a long period. Therefore, developing a hydrophilic concrete waterproof coating is crucial for effectively solving the common water seepage problem in concrete structures. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a hydrophilic epoxy resin waterproof coating, its preparation method and application.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A hydrophilic epoxy resin waterproof coating includes component A and component B;

[0006] Component A comprises the following raw material components by weight percentage:

[0007]

[0008] Component B comprises, by weight percentage, the following raw material components:

[0009] Hardener 34%–37%,

[0010] Modified curing agent 58%–62%,

[0011] Accelerator 1% to 5%, and the sum of the weight percentages of all raw materials is 100%;

[0012] The modified epoxy resin is prepared by mixing octadecyl methacrylate and bisphenol A type epoxy resin.

[0013] In a further improvement of the above-mentioned hydrophilic epoxy resin waterproof coating, the weight ratio of octadecyl methacrylate to bisphenol A type epoxy resin is 18-21:29-32.

[0014] In a further improvement of the above-mentioned hydrophilic epoxy resin waterproof coating, the epoxy equivalent of the bisphenol A type epoxy resin is 178 g / mol to 184 g / mol.

[0015] In a further improvement of the above-mentioned hydrophilic epoxy resin waterproof coating, the diluent is phenyl glycidyl ether.

[0016] In a further improvement of the above-mentioned hydrophilic epoxy resin waterproof coating, the coupling agent is KH570.

[0017] In a further improvement of the above-mentioned hydrophilic epoxy resin waterproof coating, the curing agent is at least one of 1,3-BAC and polyetheramine; wherein the polyetheramine is D230.

[0018] In a further improvement of the above-mentioned hydrophilic epoxy resin waterproof coating, the modified curing agent is a fatty amine modified curing agent.

[0019] In a further improvement of the above-mentioned hydrophilic epoxy resin waterproof coating, the accelerator is a mixture of benzyl alcohol and salicylic acid; the weight ratio of benzyl alcohol to salicylic acid is 9:11.

[0020] The above-mentioned hydrophilic epoxy resin waterproof coating is further improved in that the aliphatic amine modified curing agent is prepared by the following method: an aliphatic amine is added to a reactor, the temperature is adjusted to 30℃~35℃, a diluent is added dropwise, the addition is completed in 3 to 4 hours, the temperature is adjusted to 40℃~45℃ and the reaction continues for 3 hours to obtain the aliphatic amine modified curing agent; the equivalent ratio of the aliphatic amine to the diluent is 2.8~3.2∶1; the diluent is a mixture of 1,4-butanediol diglycidyl ether and AGE; the weight ratio of the 1,4-butanediol diglycidyl ether to AGE is 2~3∶7~8.

[0021] In a further improvement of the above-mentioned hydrophilic epoxy resin waterproof coating, the weight ratio of component A to component B is 2.8 to 3.2:1.

[0022] As a general technical concept, the present invention also provides a method for preparing the above-mentioned hydrophilic epoxy resin waterproof coating, comprising the following steps:

[0023] S1. Heat the epoxy resin to 60℃~70℃, add the modified epoxy resin, diluent and coupling agent in sequence, stir to obtain component A; add the modified curing agent and accelerator in sequence to the curing agent, adjust the temperature to 35℃~40℃, stir to obtain component B;

[0024] S2. Mix components A and B to obtain a hydrophilic epoxy resin waterproof coating.

[0025] In a further improvement to the above preparation method, the stirring time for component A during preparation is 60 min to 90 min.

[0026] In a further improvement to the above preparation method, the stirring time for component B during preparation is 60 min to 90 min.

[0027] As a general technical concept, the present invention also provides an application of the above-mentioned hydrophilic epoxy resin waterproof coating or the hydrophilic epoxy resin waterproof coating prepared by the above-mentioned preparation method in concrete waterproofing.

[0028] Compared with the prior art, the advantages of the present invention are as follows:

[0029] To address the shortcomings of existing epoxy resin waterproof coatings, such as low solids content, high viscosity, and the presence of volatile components, which lead to poor waterproofing performance, difficulty in maintaining waterproofing for extended periods, and susceptibility to secondary pollution, this invention creatively provides a hydrophilic epoxy resin waterproof coating. By optimizing the types and amounts of raw materials in components A and B, an insoluble and infusible polymeric network structure cured material can be formed through the combined action of bisphenol A epoxy resin, modified bisphenol A epoxy resin, diluent, curing agent, coupling agent, and accelerator. Therefore, mixing components A and B yields a coating with advantages such as low viscosity, good wettability, and excellent curing performance under low temperature and humid conditions. This waterproof coating allows it to effectively penetrate the pores and cracks of concrete and adhere firmly to the concrete surface, forming a strong and dense solidified layer. This effectively prevents water and air from entering the concrete. Notably, no concrete drying is required before application. More importantly, by optimizing the dosage of each raw material in the A / B components, complete reaction of each material can be achieved. On the one hand, the coating will not fail due to the volatilization of raw materials; on the other hand, the complete reaction and curing of each raw material during the curing process avoids secondary pollution and provides better waterproofing performance while being more environmentally friendly. Compared with conventional epoxy resin waterproof coatings, the hydrophilic epoxy resin waterproof coating of this invention has the following advantages: (a) High permeability: By mixing components A and B, it can be directly used for waterproofing concrete, making construction simpler. At the same time, it can firmly adhere to the concrete surface, thereby achieving superior waterproof performance; (b) Good wetting properties: By mixing components A and B, the contact between the coating and the concrete can be promoted, thereby improving the adhesion between the coating and the concrete, resulting in a better and longer-lasting waterproof effect; (c) It can cure under low temperature and humid conditions: With the combined action of components A and B, it can overcome the defects of conventional epoxy adhesives that cannot cure at low temperatures and in humid conditions, and the process is simpler; (d) Easy to flow: It can easily expand and penetrate into the capillaries and gaps on and inside the concrete surface, thus achieving deep penetration into the concrete under reasonable time conditions, without delamination, with strong waterproof ability, and reasonable operation time, making construction convenient; (e) Non-volatile, making it more environmentally friendly. Detailed Implementation

[0030] The present invention will be further described below with reference to specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0031] The raw materials and instruments used in the following examples are all commercially available; unless otherwise specified, the equipment and preparation processes used are conventional equipment and conventional processes.

[0032] Example 1

[0033] A hydrophilic epoxy resin waterproof coating includes component A and component B, wherein component A comprises the following raw material components by weight percentage:

[0034]

[0035]

[0036] Component B includes the following raw material components by weight percentage:

[0037] Hardener 37%,

[0038] Modified curing agent 58%,

[0039] Accelerator 5%.

[0040] In this embodiment, the modified epoxy resin used is prepared by mixing octadecyl methacrylate and bisphenol A type epoxy resin, wherein the weight ratio of octadecyl methacrylate to bisphenol A type epoxy resin is 39:61.

[0041] In this embodiment, the epoxy equivalent of the bisphenol A type epoxy resin used is 178 g / mol to 184 g / mol.

[0042] In this embodiment, the diluent used is phenyl glycidyl ether.

[0043] In this embodiment, the coupling agent used is KH570.

[0044] In this embodiment, the curing agent used is polyetheramine, specifically D230.

[0045] In this embodiment, the modified curing agent used is a fatty amine modified curing agent, which 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 it) is added to a reactor, the temperature is adjusted to 30℃~35℃, the diluent is added dropwise, the dropwise addition is completed in 3 hours to 4 hours, the temperature is adjusted to 40℃~45℃ and the reaction is continued for 3 hours to obtain the alicyclic amine modified curing agent. The diluent used is a mixture of 1,4-butanediol diglycidyl ether and AGE (commercially available diluent, which is C12-C12 alkyl glycidyl ether) in a weight ratio of 3:7.

[0046] In this embodiment, the accelerator used is a mixture of benzyl alcohol and salicylic acid, and the weight ratio of benzyl alcohol to salicylic acid is 9:11.

[0047] In this embodiment, the weight ratio of component A to component B is 3:1.

[0048] A method for preparing the hydrophilic epoxy resin waterproof coating in this embodiment includes the following steps:

[0049] S1. Heat the epoxy resin to 60℃~70℃, weigh 24.0g of epoxy resin and add it to a three-necked flask. Turn on the stirrer and add 40.0g of modified epoxy resin, 34.0g of diluent, and 2.0g of coupling agent in sequence. Stir for 60min to obtain component A. Add 37.0g of curing agent, 58.0g of modified curing agent, and 5.0g of accelerator in sequence to the three-necked flask, adjust the temperature to 35℃~40℃, and stir for 60min to obtain component B.

[0050] S2. Mix component A and component B in a weight ratio of 3:1 to obtain a hydrophilic epoxy resin waterproof coating.

[0051] The application of the hydrophilic epoxy resin waterproof coating prepared in this embodiment in concrete waterproofing specifically involves applying the hydrophilic epoxy resin waterproof coating prepared in this embodiment to the surface of concrete (moisture content 10%) and curing it at 23°C and under heating conditions (45-75°C). The results show that after curing at 23°C and under heating conditions, the adhesive layer meets the requirements for waterproofing of concrete buildings. In addition, the performance of related products was tested, and the results are shown in Tables 1-3.

[0052] Example 2

[0053] A hydrophilic epoxy resin waterproof coating includes component A and component B, wherein component A comprises the following raw material components by weight percentage:

[0054]

[0055] Component B includes the following raw material components by weight percentage:

[0056] 35% curing agent

[0057] Modified curing agent 62%,

[0058] Accelerator 3%.

[0059] In this embodiment, the modified epoxy resin used is prepared by mixing octadecyl methacrylate and bisphenol A type epoxy resin, wherein the weight ratio of octadecyl methacrylate to bisphenol A type epoxy resin is 39:61.

[0060] In this embodiment, the epoxy equivalent of the bisphenol A type epoxy resin used is 178 g / mol to 184 g / mol.

[0061] In this embodiment, the diluent used is phenyl glycidyl ether.

[0062] In this embodiment, the coupling agent used is KH570.

[0063] In this embodiment, the curing agent used is polyetheramine, specifically D230.

[0064] In this embodiment, the modified curing agent used is a fatty amine modified curing agent, which 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 it) is added to a reactor, the temperature is adjusted to 30℃~35℃, the diluent is added dropwise, the dropwise addition is completed in 3 hours to 4 hours, the temperature is adjusted to 40℃~45℃ and the reaction is continued for 3 hours to obtain the alicyclic amine modified curing agent. The diluent used is a mixture of 1,4-butanediol diglycidyl ether and AGE (commercially available diluent, which is C12-C12 alkyl glycidyl ether) in a weight ratio of 3:7.

[0065] In this embodiment, the accelerator used is a mixture of benzyl alcohol and salicylic acid, and the weight ratio of benzyl alcohol to salicylic acid is 9:11.

[0066] In this embodiment, the weight ratio of component A to component B is 3:1.

[0067] A method for preparing the hydrophilic epoxy resin waterproof coating in this embodiment includes the following steps:

[0068] S1. Heat the epoxy resin to 60℃~70℃, weigh 23.0g of epoxy resin and add it to a three-necked flask. Turn on the stirrer and add 43.0g of modified epoxy resin, 31.0g of diluent, and 3.0g of coupling agent in sequence. Stir for 60min to obtain component A. Add 35.0g of curing agent, 62.0g of modified curing agent, and 3.0g of accelerator in sequence to the three-necked flask, adjust the temperature to 35℃~40℃, and stir for 60min to obtain component B.

[0069] S2. Mix component A and component B in a weight ratio of 3:1 to obtain a hydrophilic epoxy resin waterproof coating.

[0070] The application of the hydrophilic epoxy resin waterproof coating prepared in this embodiment in concrete waterproofing specifically involves applying the hydrophilic epoxy resin waterproof coating prepared in this embodiment to the surface of concrete (moisture content 10%) and curing it at 23°C and under heating conditions (45-75°C). The results show that after curing at 23°C and under heating conditions, the adhesive layer meets the requirements for waterproofing of concrete buildings. In addition, the performance of related products was tested, and the results are shown in Tables 1-3.

[0071] Example 3

[0072] A hydrophilic epoxy resin waterproof coating includes component A and component B, wherein component A comprises the following raw material components by weight percentage:

[0073]

[0074] Component B includes the following raw material components by weight percentage:

[0075] Hardener 36%,

[0076] Modified curing agent 60%,

[0077] Accelerator 4%.

[0078] In this embodiment, the modified epoxy resin used is prepared by mixing octadecyl methacrylate and bisphenol A type epoxy resin, wherein the weight ratio of octadecyl methacrylate to bisphenol A type epoxy resin is 39:61.

[0079] In this embodiment, the epoxy equivalent of the bisphenol A type epoxy resin used is 178 g / mol to 184 g / mol.

[0080] In this embodiment, the diluent used is phenyl glycidyl ether.

[0081] In this embodiment, the coupling agent used is KH570.

[0082] In this embodiment, the curing agent used is polyetheramine, specifically D230.

[0083] In this embodiment, the modified curing agent used is a fatty amine modified curing agent, which 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 it) is added to a reactor, the temperature is adjusted to 30℃~35℃, the diluent is added dropwise, the dropwise addition is completed in 3 hours to 4 hours, the temperature is adjusted to 40℃~45℃ and the reaction is continued for 3 hours to obtain the alicyclic amine modified curing agent. The diluent used is a mixture of 1,4-butanediol diglycidyl ether and AGE (commercially available diluent, which is C12-C12 alkyl glycidyl ether) in a weight ratio of 3:7.

[0084] In this embodiment, the accelerator used is a mixture of benzyl alcohol and salicylic acid, and the weight ratio of benzyl alcohol to salicylic acid is 9:11.

[0085] In this embodiment, the weight ratio of component A to component B is 3:1.

[0086] A method for preparing the hydrophilic epoxy resin waterproof coating in this embodiment includes the following steps:

[0087] S1. Heat the epoxy resin to 60℃~70℃, weigh 22.0g of epoxy resin and add it to a three-necked flask. Turn on the stirrer and add 42.0g of modified epoxy resin, 33.0g of diluent, and 3.0g of coupling agent in sequence. Stir for 60min to obtain component A. Add 36.0g of curing agent, 60.0g of modified curing agent, and 4.0g of accelerator in sequence to the three-necked flask. Adjust the temperature to 35℃~40℃ and stir for 60min to obtain component B.

[0088] S2. Mix component A and component B in a weight ratio of 3:1 to obtain a hydrophilic epoxy resin waterproof coating.

[0089] The application of the hydrophilic epoxy resin waterproof coating prepared in this embodiment in concrete waterproofing specifically involves applying the hydrophilic epoxy resin waterproof coating prepared in this embodiment to the surface of concrete (moisture content 10%) and curing it at 23°C and under heating conditions (45-75°C). The results show that after curing at 23°C and under heating conditions, the adhesive layer meets the requirements for waterproofing of concrete buildings. In addition, the performance of related products was tested, and the results are shown in Tables 1-3.

[0090] Comparative Example 1

[0091] An epoxy resin waterproof coating is basically the same as that in Example 3, except that in Comparative Example 1, component A includes the following raw material components by weight percentage:

[0092]

[0093] Component B includes the following raw material components by weight percentage:

[0094] Hardener 56%,

[0095] Modified curing agent 40%,

[0096] Accelerator 4%.

[0097] The application of the epoxy resin waterproof coating prepared in Comparative Example 1 in concrete waterproofing specifically involves applying the epoxy resin waterproof coating prepared in Comparative Example 1 to the surface of concrete (moisture content 10%) and curing it at 23℃ and under heating conditions (45-75℃). The results show that after curing at 23℃ and under heating conditions, the adhesive layer is easy to peel off and cannot meet the requirements for waterproofing of concrete buildings. In addition, the performance of related products was tested, and the results are shown in Tables 1-3.

[0098] Comparative Example 2

[0099] An epoxy resin waterproof coating is basically the same as that in Example 3, except that in Comparative Example 1, component A includes the following raw material components by weight percentage:

[0100]

[0101]

[0102] Component B includes the following raw material components by weight percentage:

[0103] 32% hardener

[0104] Modified curing agent 64%,

[0105] Accelerator 4%.

[0106] The application of the epoxy resin waterproof coating prepared in Comparative Example 2 in concrete waterproofing specifically involved applying the epoxy resin waterproof coating prepared in Comparative Example 2 to the surface of concrete (moisture content 10%) and curing it at 23°C and under heating conditions (45-75°C). The results showed that after curing at 23°C and under heating conditions, the adhesive layer was prone to peeling off and could not meet the requirements for waterproofing of concrete buildings. In addition, the performance of related products was tested, and the results are shown in Tables 1-3.

[0107] Table 1. Performance Comparison of Different Hydrophilic Epoxy Resin Waterproof Coatings

[0108]

[0109] In Table 1, the testing standards for viscosity and impermeability are GB / T 2794 and GB / T 16777, respectively.

[0110] As shown in Table 1, the hydrophilic epoxy resin waterproof coating prepared by this invention has advantages such as low viscosity, good wettability, and good curing effect under low temperature and humid conditions. This indicates that the hydrophilic epoxy resin waterproof coating of this invention can effectively penetrate into the pores and cracks of concrete and firmly adhere to the concrete surface, thereby forming a firm and dense solidified material in the concrete. This can block air and moisture from entering the concrete and achieve a better waterproof effect.

[0111] Table 2. Durability test results of different cured products at a curing temperature of 25℃.

[0112]

[0113]

[0114] The testing standard used in Table 2 is GB / T 19250-2013.

[0115] As shown in Table 2, the hydrophilic epoxy resin waterproof coating prepared by the present invention can maintain high tensile strength regardless of whether it has undergone heat treatment, acid and alkali treatment or long-term aging treatment. This indicates that the hydrophilic epoxy resin waterproof coating of the present invention has excellent durability when used for concrete waterproofing and can achieve longer-lasting waterproofing.

[0116] Table 3. Test results of volatile components in different cured products obtained at a curing temperature of 25℃.

[0117]

[0118] As shown in Table 3, the hydrophilic epoxy resin waterproof coating prepared by this invention can meet the relevant standards for all volatile components when used for waterproofing concrete, making it more green and environmentally friendly.

[0119] The results above show that, compared with conventional concrete waterproof coatings, the hydrophilic epoxy resin waterproof coating of this invention has the following advantages: (a) High permeability: By mixing components A and B, it can be directly used for waterproofing concrete, making construction simpler. At the same time, it can firmly adhere to the concrete surface, thus achieving superior waterproof performance; (b) Good wetting properties: By mixing components A and B, the contact between the coating and the concrete can be promoted, thereby improving the adhesion between the coating and the concrete, resulting in better and longer-lasting waterproof effect; (c) It can cure under low temperature and humid conditions: Under the combined action of components A and B, it can overcome the defects of conventional epoxy adhesives that cannot cure at low temperatures and in humid conditions, and the process is simpler; (d) Easy to flow: It can easily expand and penetrate into the capillaries and gaps on and inside the concrete surface, thus achieving deep penetration into the concrete under reasonable time conditions, without delamination, with strong waterproof ability, and reasonable operation time, making construction convenient; (e) Non-volatile, making it more environmentally friendly.

[0120] 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 falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A hydrophilic epoxy resin waterproof coating, characterized in that, It includes component A and component B; the weight ratio of component A to component B is 2.8 to 3.2:1; Component A comprises the following raw material components by weight percentage: Epoxy resin 20%–24%, Modified epoxy resin 40%–43%, Diluent 31%–35%, The coupling agent is 2% to 3%, and the sum of the weight percentages of all raw materials is 100%. Component B comprises, by weight percentage, the following raw material components: Hardener 34%–37%, Modified curing agent 58%–62%, Accelerator 1%–5%, and the sum of the weight percentages of all raw materials is 100%; The modified epoxy resin is prepared by mixing octadecyl methacrylate and bisphenol A type epoxy resin; the weight ratio of octadecyl methacrylate to bisphenol A type epoxy resin is 18-21:29-32; the epoxy equivalent of the bisphenol A type epoxy resin is 178 g / mol to 184 g / mol. The diluent is phenyl glycidyl ether; The coupling agent is KH570; The curing agent is polyetheramine; the polyetheramine is D230. The modified curing agent is an alicyclic amine modified curing agent, which is prepared by the following method: an alicyclic amine is added to a reactor, the temperature is adjusted to 30℃~35℃, a diluent is added dropwise, the dropwise addition is completed in 3 to 4 hours, the temperature is adjusted to 40℃~45℃ and the reaction continues for 3 hours to obtain 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; the weight ratio of 1,4-butanediol diglycidyl ether to AGE is 2~3∶7~8; The accelerator is a mixture of benzyl alcohol and salicylic acid; the weight ratio of benzyl alcohol to salicylic acid is 9:

11.

2. A method for preparing a hydrophilic epoxy resin waterproof coating as described in claim 1, characterized in that, Includes the following steps: S1. Heat the epoxy resin to 60℃~70℃, add the modified epoxy resin, diluent and coupling agent in sequence, stir to obtain component A; add the modified curing agent and accelerator in sequence to the curing agent, adjust the temperature to 35℃~40℃, stir to obtain component B; S2. Mix components A and B to obtain a hydrophilic epoxy resin waterproof coating.

3. The preparation method according to claim 2, characterized in that, During the preparation of component A, the stirring time is 60 min to 90 min; During the preparation of component B, the stirring time is 60 min to 90 min.

4. The application of a hydrophilic epoxy resin waterproof coating as described in claim 1 or a hydrophilic epoxy resin waterproof coating prepared by the preparation method described in claim 2 or 3 in concrete waterproofing.

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