Waterborne epoxy curing agent, preparation method and application thereof
Patent Information
- Application Number
- CN202611258653.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-19
- Publication Date
- 2026-10-27
AI Technical Summary
然而，在车辆荷载与温湿变化作用下，其表面易出现裂缝、层间剥离等病害
本发明提供了一种水性环氧固化剂，通过加入胺类促进剂，可有效提高固化剂的固化速度快，并且将水性环氧固化剂用于制备水泥砂浆，水性环氧固化剂与环氧树脂具有优异的相容性，不仅能显著缩短固化干燥时间，从而有效改善了涂层的整体性能和施工效率，而且所得到的水泥砂浆具有优异的力学性能，抗压强度可以达到42MPa。本发明还提供了该水性环氧固化剂的制备方法，通过酚醛胺中间体与聚乙二醇二缩水甘油醚的加成反应，引入柔性聚醚链段，同时保留酚醛胺骨架的快速固化特性，使固化剂兼具良好的柔韧性与附着力，能够与水性混凝土基材形成牢固的化学键合与物理锚固，有效避免界面开裂和层间剥离。本发明制备方法全程无需使用有机溶剂，最终产品为水基体系，VOC含量极低，符合环保要求，避免了有机溶剂对人体健康和环境的潜在危害。
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of epoxy curing agent technology, specifically relating to a water-based epoxy curing agent, its preparation method, and its application. Background Technology
[0002] With the development of green building materials, water-based concrete (water-based epoxy / emulsion modified concrete) has been widely used in key areas such as bridge waterproofing layers, airport pavement, and industrial flooring due to its excellent toughness and durability. However, under vehicle loads and temperature and humidity changes, its surface is prone to defects such as cracks and interlayer delamination. Currently, conventional repair methods mainly have the following problems: ordinary cement mortar is prone to interface cracking due to differences in thermal expansion coefficients; solvent-based repair materials can swell polymer chains in the substrate, causing "biting" and peeling; although existing water-based materials are environmentally friendly, they have slow curing speed and low early strength, especially in low temperature and high humidity environments, making it difficult to meet the needs of rapid traffic opening.
[0003] Various waterborne epoxy curing agents have been disclosed in the prior art, such as those with polyamide, polyamine, or phenolic amine as the backbone. However, these curing agents still have significant shortcomings in practical applications: on the one hand, most waterborne curing agents have poor compatibility with epoxy resins, requiring the addition of emulsifiers or organic co-solvents, resulting in slow film drying and insufficient initial hardness; on the other hand, although some curing agents can achieve a certain degree of rapid curing, their storage stability is poor, or the flexibility and adhesion of the cured coating cannot meet the stringent requirements of road repair. Therefore, developing a waterborne epoxy curing agent that is highly compatible with waterborne concrete substrates, can achieve rapid curing at room temperature or even under low temperature and high humidity conditions, and possesses good mechanical properties has become an urgent technical problem to be solved in the road maintenance industry. Summary of the Invention
[0004] To overcome the problems existing in the prior art, one objective of this invention is to provide a water-based epoxy curing agent. A second objective is to provide a method for preparing the aforementioned water-based epoxy curing agent. A third objective is to provide applications of the aforementioned water-based epoxy curing agent. A fourth objective is to provide an epoxy resin-modified cement mortar.
[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides an aqueous epoxy curing agent comprising the following raw materials: phenolic compounds, aldehyde compounds, polyamines, polyethylene glycol diglycidyl ether, amine accelerators, and water.
[0006] Preferably, the phenolic compound includes at least one of phenol, cresol, nonylphenol, cashew phenol, bisphenol A, catechol, resorcinol, hydroquinone, eugenol, thymol, lignin-derived phenol, chlorophenol, nitrophenol, aminophenol, and naphthol.
[0007] Preferably, the aldehyde compound includes at least one of formaldehyde, paraformaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, isobutyraldehyde, pentanal, benzaldehyde, furfural, salicylaldehyde, o-phthalaldehyde, isophthalaldehyde, and terephthalaldehyde.
[0008] Preferably, the polyamine includes at least one selected from ethylenediamine, diethylenetriamine, triethylenetetramine, and tetraethylenepentamine.
[0009] Preferably, the amine accelerator is selected from at least one of 2,4,6-tris(dimethylaminomethyl)phenol, triethylamine, benzylamine, triethanolamine, N,N-dimethylbenzylamine, N-methylmorpholine, triethylenediamine, pyridine, 2-ethyl-4-methylimidazolium, hexamethylenetetramine, 1,4-dimethylpiperazine, N,N-dimethylcyclohexylamine, tris(N,N-dimethylaminopropyl)amine, N,N,N',N'-tetramethyl-1,6-hexanediamine, N,N-diisopropylethylamine, 1,3,5-tris(dimethylaminopropyl)-1,3,5-hexahydrotriazine, bis(dimethylaminoethyl) ether, and tetramethylammonium hydroxide.
[0010] Preferably, the preparation raw materials, by weight, include the following: 10-80 parts of phenolic compounds, 5-30 parts of aldehyde compounds, 20-50 parts of polyamines, 5-11 parts of polyethylene glycol diglycidyl ether, 20-30 parts of amine accelerators, and 10-30 parts of water.
[0011] More preferably, the mass fraction of the phenolic compound is any value or a range formed by any two of the following: 10, 20, 30, 40, 50, 60, 70, and 80 parts.
[0012] More preferably, the phenolic compound is phenol, and its mass parts are any value or any two of 15, 17, 19, 21, 23, and 25 parts.
[0013] More preferably, the mass fraction of the polyamine is any value or any two of 20, 25, 30, 35, 40, 45, and 50 parts.
[0014] More preferably, the mass fraction of the aldehyde compound is any value or a range formed by any two of the following: 5, 10, 15, 20, 25, and 30 parts.
[0015] More preferably, the aldehyde compound is formaldehyde, and its mass parts are any value or any two of the following: 5, 6, 7, 8, 9, and 10 parts.
[0016] More preferably, the mass fraction of the polyethylene glycol diglycidyl ether is any one of 5, 6, 7, 8, 9, 10, or 11 parts, or a range formed by any two of these values.
[0017] More preferably, the mass fraction of the amine accelerator is any value or any two of the following: 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30 parts.
[0018] More preferably, the mass fraction of the water is any one of 10, 15, 20, 25, or 30 parts, or a range formed by any two of these values.
[0019] Preferably, the epoxy value of the polyethylene glycol diglycidyl ether is 0.1-0.6 mol / 100g.
[0020] A second aspect of the present invention provides a method for preparing the waterborne epoxy curing agent described in the first aspect, comprising the following steps: S1. A phenolic compound, an aldehyde compound, and a polyamine are reacted in a first reaction to obtain a phenolic amine intermediate. S2. The phenolic amine intermediate undergoes a second reaction with polyethylene glycol diglycidyl ether to obtain a mixture; S3. Add an amine accelerator to the mixture obtained in S2 and mix; then add water to obtain the water-based epoxy curing agent.
[0021] Preferably, step S1 specifically includes the following steps: premixing phenolic compounds and polyamines, then adding aldehyde compounds, and carrying out a first reaction to obtain a phenolic amine intermediate.
[0022] More preferably, the mixing is carried out at 50-70°C.
[0023] Preferably, the molar ratio of the phenolic amine intermediate to polyethylene glycol diglycidyl ether is (1-5):1.
[0024] More preferably, the molar ratio of the phenolic amine intermediate to polyethylene glycol diglycidyl ether is any value or any two values of 1:1, 2:1, 3:1, 4:1, or 5:1.
[0025] Preferably, step S2 specifically includes the following steps: heating the aldehyde-amine intermediate to 50-70°C, and then adding polyethylene glycol diglycidyl ether dropwise into the reaction system to carry out the second reaction.
[0026] More preferably, 70%-95% by mass of the aldehyde-amine intermediate is used for the second reaction, and then the remaining aldehyde-amine intermediate is added and stirred.
[0027] Preferably, the reaction temperature of the first reaction is 90-100℃.
[0028] Preferably, the reaction time of the first reaction is 3-5 h.
[0029] Preferably, the reaction temperature of the second reaction is 80-100℃.
[0030] Preferably, the reaction time of the second reaction is 0.5-2 h.
[0031] The third aspect of this invention provides the application of the waterborne epoxy curing agent described in the first aspect in epoxy resin modified cement mortar.
[0032] The fourth aspect of the present invention provides an epoxy resin modified cement mortar, comprising the following components: epoxy resin, the waterborne epoxy curing agent described in the first aspect, cement, and sand.
[0033] Preferably, the ratio of the epoxy equivalent of the epoxy resin to the active hydrogen equivalent of the waterborne epoxy curing agent is 1:(0.5-2).
[0034] Preferably, the epoxy resin is a bisphenol A type epoxy resin.
[0035] The beneficial effects of this invention are: This invention provides a water-based epoxy curing agent. By adding an amine accelerator, the curing speed of the curing agent can be effectively improved. When used to prepare cement mortar, the water-based epoxy curing agent exhibits excellent compatibility with epoxy resin, significantly shortening the curing and drying time, thereby effectively improving the overall performance and construction efficiency of the coating. Furthermore, the resulting cement mortar possesses excellent mechanical properties, with a compressive strength reaching 42 MPa. This invention also provides a method for preparing this water-based epoxy curing agent. Through the addition reaction of a phenolic amine intermediate with polyethylene glycol diglycidyl ether, flexible polyether segments are introduced while retaining the rapid curing characteristics of the phenolic amine skeleton. This gives the curing agent both good flexibility and adhesion, enabling it to form a strong chemical bond and physical anchor with the water-based concrete substrate, effectively preventing interface cracking and interlayer delamination. The preparation method of this invention does not require the use of organic solvents throughout the process. The final product is a water-based system with extremely low VOC content, meeting environmental protection requirements and avoiding the potential harm to human health and the environment posed by organic solvents. Detailed Implementation
[0036] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the raw materials used in the following embodiments can be obtained from conventional commercial channels or prepared and isolated through simple synthesis; unless otherwise specified, the processes employed are conventional processes in the art.
[0037] Example 1 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 21 g of phenol and 26 g of diethylenetriamine to a 125 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 90°C for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 48 grams). (4) Take 45 g of the above phenolic amine intermediate and add it to a 250 mL round-bottom flask, then heat it to 60 °C; (5) Add 10 g of polyethylene glycol diglycidyl ether (epoxy value 0.35 mol / 100g) dropwise to the system in step (4) for 1 h, and react at 80℃ for 1 h. (6) Cool down to 50°C, add the remaining phenolic amine intermediate (3 g) to the system at once, and stir for 30 min; (7) Add 23 g of amine accelerator (2,4,6-tris(dimethylaminomethyl)phenol) to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0038] In this embodiment, the molar mass of phenolic amine is 209 g / mol, and the molar ratio of phenolic amine intermediate to polyethylene glycol diglycidyl ether is 3:1.
[0039] Example 2 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 21 g of phenol and 36.5 g of triethylenetetramine to a 125 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 95°C for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 48 grams). (4) Take 46 g of the above phenolic amine intermediate and add it to a 250 mL round-bottom flask, then heat to 65 °C; (5) Add 9 g of polyethylene glycol diglycidyl ether (epoxy value 0.55 mol / 100g) dropwise to the system in step (4) for 1.5 h, and react at 90℃ for 1 h. (6) Cool down to 50°C, add the remaining phenolic amine intermediate (2 g) to the system at once, and stir for 30 min; (7) Add 23 g of amine accelerator (2,4,6-tris(dimethylaminomethyl)phenol) to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0040] In this embodiment, the molar ratio of phenolic amine intermediate to polyethylene glycol diglycidyl ether is 3:1.
[0041] Example 3 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 21 g of phenol and 34.5 g of m-phenylenediamine to a 125 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 100℃ for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 48 grams). (4) Take 48 g of the above phenolic amine intermediate and add it to a 250 mL round-bottom flask, then heat it to 70 °C; (5) 12 g of polyethylene glycol diglycidyl ether (epoxy value 0.14 mol / 100g) was added dropwise to the system in step (4) over a period of 2 h, and the reaction was carried out at 100 °C for 1 h. (6) Cool down to 50°C. In this embodiment, the phenolic amine intermediate has been used entirely in step (4), so no additional addition is needed. (7) Add 23 g of amine accelerator (2,4,6-tris(dimethylaminomethyl)phenol) to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0042] In this embodiment, the molar ratio of phenolic amine intermediate to polyethylene glycol diglycidyl ether is 3:1.
[0043] Example 4 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 21 g of phenol and 42.5 g of isophorone diamine to a 125 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 90°C for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 47 grams). (4) Take 35 g of the above phenolic amine intermediate and add it to a 250 mL round-bottom flask, then heat it to 60 °C; (5) 11 g of polyethylene glycol diglycidyl ether (epoxide value 0.25 mol / 100g) was added dropwise to the system in step (4) over a period of 1.2 h, and the reaction was carried out at 85 °C for 1 h. (6) Cool down to 50°C, add the remaining phenolic amine intermediate (12 g) to the system at once, and stir for 30 min; (7) Add 23 g of amine accelerator (DMP-30) to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0044] In this embodiment, the molar ratio of phenolic amine intermediate to polyethylene glycol diglycidyl ether is 3:1.
[0045] Example 5 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 55 g of nonylphenol and 26 g of diethylenetriamine to a 250 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 92℃ for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 48 grams). (4) Take 44 g of the above phenolic amine intermediate and add it to a 125 mL round-bottom flask, and heat it to 68 °C; (5) Add 10.5 g of polyethylene glycol diglycidyl ether (epoxide value 0.42 mol / 100g) dropwise to the system in step (4) over a period of 1.8 h and react at 95 °C for 1 h. (6) Cool down to 50°C, add the remaining phenolic amine intermediate (4 g) to the system at once, and stir for 30 min; (7) Add 23 g of amine accelerator (triethanolamine) to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0046] In this embodiment, the molar ratio of phenolic amine intermediate to polyethylene glycol diglycidyl ether is 3:1.
[0047] Example 6 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 75.5 g of cashew phenol and 26 g of diethylenetriamine to a 250 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 98°C for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 56 grams). (4) Take 40 g of the above phenolic amine intermediate and add it to a 250 mL round-bottom flask, then heat it to 62 °C; (5) Add 9.5 g of polyethylene glycol diglycidyl ether (epoxide value 0.30 mol / 100g) dropwise to the system in step (4) over a period of 1.4 h and react at 88 °C for 1 h. (6) Cool down to 50°C, add the remaining phenolic amine intermediate (16 g) to the system at once, and stir for 30 min; (7) Add 23 g of amine accelerator (2,4,6-tris(dimethylaminomethyl)phenol) to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0048] Example 7 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 21 g of phenol and 26 g of diethylenetriamine to a 250 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 90°C for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 48 grams). (4) Take 45 g of the above phenolic amine intermediate and add it to a 250 mL round-bottom flask, then heat it to 60 °C; (5) Add 10 g of polyethylene glycol diglycidyl ether (epoxy value 0.35 mol / 100g) dropwise to the system in step (4) for 1 h, and react at 80℃ for 1 h. (6) Cool down to 50°C, add the remaining phenolic amine intermediate (3 g) to the system at once, and stir for 30 min; (7) Add 23 g of N,N-dimethylbenzylamine, an amine accelerator, to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0049] In this embodiment, the molar ratio of phenolic amine intermediate to polyethylene glycol diglycidyl ether is 3:1.
[0050] Example 8 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 21 g of phenol and 26 g of diethylenetriamine to a 250 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 90°C for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 48 grams). (4) Take 45 g of the above phenolic amine intermediate and add it to a 250 mL round-bottom flask, then heat it to 60 °C; (5) Add 10 g of polyethylene glycol diglycidyl ether (epoxy value 0.35 mol / 100g) dropwise to the system in step (4) for 1 h, and react at 80℃ for 1 h. (6) Cool down to 50°C, add the remaining phenolic amine intermediate (3 g) to the system at once, and stir for 30 min; (7) Add 23 g of imidazole promoter 2-ethyl-4-methylimidazolium to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0051] In this embodiment, the molar ratio of phenolic amine intermediate to polyethylene glycol diglycidyl ether is 3:1.
[0052] Example 9 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 21 g of phenol and 26 g of diethylenetriamine to a 250 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 90°C for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 48 grams). (4) Take 45 g of the above phenolic amine intermediate and add it to a 250 mL round-bottom flask, then heat it to 60 °C; (5) Add 10 g of polyethylene glycol diglycidyl ether (epoxy value 0.35 mol / 100g) dropwise to the system in step (4) for 1 h, and react at 80℃ for 1 h. (6) Cool down to 50°C, add the remaining phenolic amine intermediate (3 g) to the system at once, and stir for 30 min; (7) Add 23 g of amine accelerator N,N,N',N'-tetramethyl-1,6-hexanediamine to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0053] In this embodiment, the molar ratio of phenolic amine intermediate to polyethylene glycol diglycidyl ether is 3:1.
[0054] Example 10 This embodiment provides a method for preparing a water-based epoxy curing agent, including the following steps: (1) Add 21 g of phenol and 26 g of diethylenetriamine to a 250 mL round-bottom flask and stir at 60 °C for 20 min; (2) Add 8 grams of formaldehyde to the system in step (1) and heat to 90°C for 4 h; (3) Heat to 120°C and perform vacuum distillation to remove water and unreacted small molecules. Cool naturally to obtain phenolic amine intermediate (about 48 grams). (4) Take 45 g of the above phenolic amine intermediate and add it to a 250 mL round-bottom flask, then heat it to 60 °C; (5) Add 10 g of polyethylene glycol diglycidyl ether (epoxy value 0.35 mol / 100g) dropwise to the system in step (4) for 1 h, and react at 80℃ for 1 h. (6) Cool down to 50°C, add the remaining phenolic amine intermediate (3 g) to the system at once, and stir for 30 min; (7) Add 23 g of tris(N,N-dimethylaminopropyl)amine, an amine accelerator, to the system at once and stir for 30 min; (8) Add 20 grams of deionized water to the system at once and stir for 30 min to obtain waterborne epoxy curing agent.
[0055] In this embodiment, the molar ratio of phenolic amine intermediate to polyethylene glycol diglycidyl ether is 3:1.
[0056] Curing agent performance testing methods Referring to the test method of GB / T 2567-2021, 60 parts of cement, 30 parts of sand, and 10 parts of epoxy resin E51 were mixed. The water-based epoxy curing agents from Examples 1-10 were added at a ratio of 1:1 (epoxy equivalent to active hydrogen equivalent). For the comparative example, commercially available water-based epoxy amine curing agent 287 was used. The mixture was poured into a silicone compression mold and cured at room temperature for two hours. The surface dryness and compressive strength were then observed. The results are shown in Table 1 below. Table 1
[0057] As shown in Table 1, the performance of each embodiment of the present invention is superior to that of waterborne epoxy amine curing agent 287 by optimizing the structure of the phenolic amine intermediate and the amine accelerator. Furthermore, the cement mortar based on the waterborne epoxy curing agent of Example 10 can achieve a compressive strength of 42 MPa within 2 hours.
[0058] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.
Claims
1. A water-based epoxy curing agent, characterized in that, The raw materials include: phenolic compounds, aldehyde compounds, polyamines, polyethylene glycol diglycidyl ether, amine accelerators, and water.
2. The water-based epoxy curing agent according to claim 1, characterized in that, The phenolic compounds include at least one of phenol, cresol, nonylphenol, cashew phenol, bisphenol A, catechol, resorcinol, hydroquinone, eugenol, thymol, lignin-derived phenol, chlorophenol, nitrophenol, aminophenol, and naphthol. And / or, the aldehyde compounds include at least one of formaldehyde, paraformaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, isobutyraldehyde, pentanal, benzaldehyde, furfural, salicylaldehyde, o-phthalaldehyde, isophthalaldehyde, and terephthalaldehyde.
3. The water-based epoxy curing agent according to claim 1, characterized in that, The polyamine includes at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, and tetraethylenepentamine.
4. The water-based epoxy curing agent according to claim 1, characterized in that, The amine accelerator is selected from at least one of 2,4,6-tris(dimethylaminomethyl)phenol, triethylamine, benzylamine, triethanolamine, N,N-dimethylbenzylamine, N-methylmorpholine, triethylenediamine, pyridine, 2-ethyl-4-methylimidazolium, hexamethylenetetramine, 1,4-dimethylpiperazine, N,N-dimethylcyclohexylamine, tris(N,N-dimethylaminopropyl)amine, N,N,N',N'-tetramethyl-1,6-hexanediamine, N,N-diisopropylethylamine, 1,3,5-tris(dimethylaminopropyl)-1,3,5-hexahydrotriazine, bis(dimethylaminoethyl) ether, and tetramethylammonium hydroxide.
5. The method for preparing the waterborne epoxy curing agent according to any one of claims 1-4, characterized in that, Includes the following steps: S1. A phenolic compound, an aldehyde compound, and a polyamine are reacted in a first reaction to obtain a phenolic amine intermediate. S2. The phenolic amine intermediate undergoes a second reaction with polyethylene glycol diglycidyl ether to obtain a mixture; S3. Add an amine accelerator to the mixture obtained in S2 and mix; then add water to obtain the water-based epoxy curing agent.
6. The method for preparing the waterborne epoxy curing agent according to claim 5, characterized in that, The molar ratio of the phenolic amine intermediate to polyethylene glycol diglycidyl ether is (1-5):
1.
7. The method for preparing the waterborne epoxy curing agent according to claim 5, characterized in that, The reaction temperature of the first reaction is 90-100℃; And / or, the reaction time of the first reaction is 3-5 h.
8. The method for preparing the waterborne epoxy curing agent according to claim 5, characterized in that, The reaction temperature for the second reaction is 80-100℃; And / or, the reaction time of the second reaction is 0.5-2 h.
9. The application of the waterborne epoxy curing agent according to any one of claims 1-4 in epoxy resin modified cement mortar.
10. An epoxy resin modified cement mortar, characterized in that, It comprises the following components: epoxy resin, the waterborne epoxy curing agent as described in any one of claims 1-4, cement, and sand.