High-gloss grout curing agent suitable for application in humid environments and its preparation method

Abstract

This invention relates to a high-gloss grout curing agent suitable for application in humid environments and its preparation method. It is mainly prepared from the following components in the following weight ratios: This invention overcomes the shortcomings of existing grout curing agents that add nonylphenol and alkylphenol to improve hydrophobicity, resulting in biotoxicity, easy oxidation and discoloration, loss of gloss, and whitening / brightening during curing in humid environments. Through the synergistic reaction of a difunctional cyclic epoxy compound, N-cyclohexyl-1,3-propanediamine in an amine composition, and 1,3-cyclohexanedimethylamine modified by a monofunctional epoxy compound, as well as the synergistic combination of other preferred components and their proportions in the system, this invention possesses the advantages of maintaining high gloss in humid environments, being harmless to the human body, having strong adhesion, good toughness, and resistance to yellowing.

Description

Technical Field

[0001] This invention relates to a high-gloss tile grout curing agent that can be applied in humid environments and its preparation method, which is applied in the field of tile grout raw material production. Background Technology

[0002] The descriptions in this section provide background information related to this disclosure only and do not constitute prior art. With people's increasing pursuit of a better home life, grout sealant has become an indispensable decorative material in the home furnishing market. Grout sealant, prepared by combining grout curing agent and epoxy resin, not only needs to consider adhesion and toughness, but also has high requirements for gloss, a more important indicator affecting aesthetics. However, conventional grout curing agents are greatly affected by environmental humidity. In the humid and rainy seasons of southern China, construction under such weather conditions often leads to a significant decrease in gloss, whitening and discoloration, and in severe cases, even the entire grout line may turn white. To solve this problem, professional technicians add nonylphenol and alkylphenol during the synthesis of grout curing agents to improve their hydrophobicity. However, these phenolic substances are biotoxic, harmful to human health, and very prone to oxidation and discoloration, thus affecting the appearance. Although the existing patent CN 114790357 discloses a two-component epoxy grout that can be applied in a humid environment and its preparation method, it avoids the problems of the grout not drying, discoloration and peeling after application in a humid environment by introducing water-resistant agents and coupling agents into the grout B glue. However, the problem of gloss loss, whitening and mottled appearance when the grout curing agent is cured in a humid environment has not been fundamentally solved.

[0003] Therefore, it has become an urgent task to provide a high-gloss grout curing agent that can maintain high gloss in humid environments, is harmless to the human body, has strong adhesion, good toughness, and is resistant to yellowing, and can be applied in humid environments, as well as its preparation method. Summary of the Invention

[0004] To overcome the shortcomings of existing grout curing agents that add nonylphenol and alkylphenol to improve hydrophobicity, such as biotoxicity, easy oxidation and discoloration, loss of gloss, and whitening / brightening during curing in humid environments, this invention provides a high-gloss grout curing agent suitable for application in humid environments and its preparation method. Through the combined reaction of a difunctional cyclic epoxy compound, N-cyclohexyl-1,3-propanediamine in an amine composition, and 1,3-cyclohexanedimethylamine modified by a monofunctional epoxy compound, as well as the synergistic effect of other preferred components and their proportions in the system, this invention offers advantages such as maintaining high gloss in humid environments, being harmless to the human body, having strong adhesion, good toughness, and resistance to yellowing.

[0005] The technical solution of the present invention is as follows:

[0006] A high-gloss grout curing agent suitable for application in humid environments is mainly prepared from the following components in the following weight ratios:

[0007]

[0008] The amine composition comprises 70-90% N-cyclohexyl-1,3-propanediamine by weight.

[0009] The monofunctional epoxy modified 1,3-cyclohexanedimethylamine is prepared by reacting 1,3-cyclohexanedimethylamine with a monofunctional epoxy compound in a molar ratio of 1:0.2-1:0.4; the monofunctional epoxy compound is one of C8 glycidyl ether, decyl glycidyl ether, or C11 glycidyl ether, or any combination of two or more of them.

[0010] The difunctional cyclic epoxy compound is one or any combination of two or more of the following: hydrogenated bisphenol A type epoxy resin, 1,2-cyclohexanediol diglycidyl ether, and 1,4-cyclohexanediethanol diglycidyl ether.

[0011] This application's high-gloss tile grout curing agent, suitable for application in humid environments, achieves its advantages through the synergistic reaction of a difunctional cyclic epoxy compound, N-cyclohexyl-1,3-propanediamine in an amine composition, and 1,3-cyclohexanedimethylamine modified with a monofunctional epoxy compound, along with the synergistic effect of other preferred components and their proportions in the system. It maintains high gloss in humid environments, is harmless to humans, exhibits strong adhesion, good toughness, and resistance to yellowing. The system utilizes a special amine composition, in which the cyclic aliphatic amine N-cyclohexyl-1,3-propanediamine provides excellent gloss and toughness while avoiding the gloss loss, whitening, and discoloration issues that occur in humid environments caused by traditional tile grout curing agents using polyether amines for system toughness. Furthermore, the amine composition works synergistically with other preferred components, resulting in a tile grout curing agent with strong adhesion, good toughness, and the ability to achieve high gloss in humid environments. The curing speed of the amine composition is relatively slow, and the modification with the difunctional cyclic epoxy compound further slows down the curing speed. Modifying 1,3-cyclohexanedimethylamine with a lower molar ratio ensures that the curing speed of the grout sealant is not affected when using difunctional cyclic epoxy compounds as modifiers, while choosing long-chain monofunctional epoxy compounds further improves the hydrophobicity of the grout sealant. Traditional difunctional epoxy compounds (a broader concept than difunctional cyclic epoxy compounds) do not all possess high gloss characteristics; some are even hydrophilic, causing whitening and discoloration. The difunctional cyclic epoxy compound selected in this case, compared to bisphenol A type epoxy resin, bisphenol F type epoxy resin, and other types of difunctional epoxy compounds, has lower viscosity, better hydrophobicity, and minimal impact on gloss after curing in humid environments. It also maintains the toughness, yellowing resistance, and wettability of the grout sealant.

[0012] The amine composition includes, in addition to N-cyclohexyl-1,3-propanediamine, isofluranediamine and 4,4'-diaminodicyclohexylmethane.

[0013] The preferred amine composition can further improve the gloss of the grout curing agent and avoid the cost increase caused by the addition of too much monofunctional epoxy modified 1,3-cyclohexanedimethylamine.

[0014] The diluent is chlorine-free benzyl alcohol.

[0015] Chlorine-free benzyl alcohol is prepared by direct oxidation of toluene. Since the process does not involve benzyl chloride as a raw material, the finished product has no benzyl chloride residue, and its odor is much lower than that of chlorine-containing benzyl alcohol, making it friendly to construction workers.

[0016] A method for preparing a high-gloss grout hardener suitable for application in humid environments includes the following steps performed in sequence:

[0017] (I) Preparation of 1,3-cyclohexanedimethylamine modified with monofunctional epoxy compounds

[0018] (1) Under nitrogen protection, add a monofunctional epoxy compound dropwise to 1,3-cyclohexanedimethylamine within 0.5-1.5 h, and mix the two evenly at 30-40 °C; the molar ratio of the 1,3-cyclohexanedimethylamine to the monofunctional epoxy compound is 1:0.2-1:0.4.

[0019] (2) Then, the mixture obtained in step (1) is heated to 50-60℃ and reacted for 1-3h to obtain monofunctional epoxy modified 1,3-cyclohexanedimethylamine.

[0020] (II) Preparation of a high-gloss grout curing agent suitable for application in humid environments

[0021] (1) Under nitrogen protection, the monofunctional epoxy modified 1,3-cyclohexanedimethylamine and the amine composition were mixed evenly at 30-40°C.

[0022] (2) After the bifunctional cyclic epoxy compound and the diluent are mixed evenly, they are added to the mixture obtained in step (1) in 3-5 portions and mixed evenly at 55-65℃.

[0023] (3) Keep the temperature at 55-65℃ and let the mixture obtained in step (2) react for 1-3 hours to obtain a high-gloss grout curing agent that can be applied in a humid environment.

[0024] The preparation method of the high-gloss grout curing agent that can be applied in humid environments is simple and easy to operate.

[0025] Compared with the prior art, this invention application has the following advantages:

[0026] 1) The high-gloss grout curing agent of this application, which can be applied in humid environments, is the result of a complex reaction of a difunctional cyclic epoxy compound, N-cyclohexyl-1,3-propanediamine in an amine composition, and 1,3-cyclohexanedimethylamine modified by a monofunctional epoxy compound, as well as other preferred components in the system and their dosages.

[0027] The synergistic combination of proportions has the advantages of maintaining high gloss in humid environments, being harmless to the human body, having strong adhesion, good toughness, and resistance to yellowing;

[0028] 2) The preferred amine composition can further improve the gloss of the tile grout curing agent and avoid the cost increase caused by the addition of too much monofunctional epoxy modified 1,3-cyclohexanedimethylamine.

[0029] 3) The preparation method of this high-gloss grout curing agent that can be applied in humid environments is simple and easy to operate. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] The high-gloss grout curing agent for application in humid environments described in this invention is prepared from the following components in the following weight ratios:

[0033]

[0034] The amine composition comprises 70% N-cyclohexyl-1,3-propanediamine and 30% isofluranediamine by weight.

[0035] The monofunctional epoxy modified 1,3-cyclohexanedimethylamine is prepared by reacting 1,3-cyclohexanedimethylamine with a monofunctional epoxy compound at a molar ratio of 1:0.2; the monofunctional epoxy compound is C8 glycidyl ether.

[0036] The difunctional cyclic epoxy compound is a hydrogenated bisphenol A type epoxy resin.

[0037] The diluent is chlorine-free benzyl alcohol.

[0038] A method for preparing a high-gloss grout hardener suitable for application in humid environments includes the following steps performed in sequence:

[0039] (I) Preparation of 1,3-cyclohexanedimethylamine modified with monofunctional epoxy compounds

[0040] (1) Under nitrogen protection, a monofunctional epoxy compound was added dropwise to 1,3-cyclohexanedimethylamine within 0.5 h, and the two were mixed evenly at 30 °C; the molar ratio of the 1,3-cyclohexanedimethylamine to the monofunctional epoxy compound was 1:0.2.

[0041] (2) Then, the mixture obtained in step (1) is heated to 50°C and reacted for 1 hour to obtain monofunctional epoxy modified 1,3-cyclohexanedimethylamine.

[0042] (II) Preparation of a high-gloss grout curing agent suitable for application in humid environments

[0043] (1) Under nitrogen protection, the monofunctional epoxy modified 1,3-cyclohexanedimethylamine and the amine composition were mixed evenly at 30°C.

[0044] (2) After the bifunctional cyclic epoxy compound and the diluent are mixed evenly, they are added to the mixture obtained in step (1) in three portions and mixed evenly at 55°C.

[0045] (3) Keep at 55°C and let the mixture obtained in step (2) react for 1 hour to obtain a high-gloss grout curing agent that can be applied in a humid environment.

[0046] Example 2

[0047] The high-gloss grout curing agent for application in humid environments described in this invention is prepared from the following components in the following weight ratios:

[0048]

[0049] The amine composition comprises 80% N-cyclohexyl-1,3-propanediamine and 20% 4,4'-diaminodicyclohexylmethane by weight.

[0050] The monofunctional epoxy modified 1,3-cyclohexanedimethylamine is prepared by reacting 1,3-cyclohexanedimethylamine with a monofunctional epoxy compound at a molar ratio of 1:0.3; the monofunctional epoxy compound is decyl glycidyl ether.

[0051] The bifunctional cyclic epoxy compound is 1,2-cyclohexanediol diglycidyl ether.

[0052] The diluent is chlorine-free benzyl alcohol.

[0053] A method for preparing a high-gloss grout hardener suitable for application in humid environments includes the following steps performed in sequence:

[0054] (I) Preparation of 1,3-cyclohexanedimethylamine modified with monofunctional epoxy compounds

[0055] (1) Under nitrogen protection, a monofunctional epoxy compound was added dropwise to 1,3-cyclohexanedimethylamine within 1 hour, and the two were mixed evenly at 35°C; the molar ratio of the 1,3-cyclohexanedimethylamine to the monofunctional epoxy compound was 1:0.3.

[0056] (2) Then, the mixture obtained in step (1) is heated to 55°C and reacted for 2 hours to obtain monofunctional epoxy modified 1,3-cyclohexanedimethylamine.

[0057] (II) Preparation of a high-gloss grout curing agent suitable for application in humid environments

[0058] (1) Under nitrogen protection, the monofunctional epoxy modified 1,3-cyclohexanedimethylamine and the amine composition were mixed evenly at 35°C.

[0059] (2) After the bifunctional cyclic epoxy compound and the diluent are mixed evenly, they are added to the mixture obtained in step (1) in 4 portions and mixed evenly at 60°C.

[0060] (3) Keep the temperature at 60°C and let the mixture obtained in step (2) react for 2 hours to obtain a high-gloss grout curing agent that can be applied in a humid environment.

[0061] Example 3

[0062] The high-gloss grout curing agent for application in humid environments described in this invention is prepared from the following components in the following weight ratios:

[0063]

[0064] The amine composition comprises 90% N-cyclohexyl-1,3-propanediamine, 5% isofluranediamine, and 5% 4,4'-diaminodicyclohexylmethane by weight.

[0065] The monofunctional epoxy modified 1,3-cyclohexanedimethylamine is prepared by reacting 1,3-cyclohexanedimethylamine with a monofunctional epoxy compound at a molar ratio of 1:0.4; the monofunctional epoxy compound is cdodecyl glycidyl ether.

[0066] The bifunctional cyclic epoxy compound is 1,4-cyclohexanediethanol diglycidyl ether.

[0067] The diluent is chlorine-free benzyl alcohol.

[0068] A method for preparing a high-gloss grout hardener suitable for application in humid environments includes the following steps performed in sequence:

[0069] (I) Preparation of 1,3-cyclohexanedimethylamine modified with monofunctional epoxy compounds

[0070] (1) Under nitrogen protection, a monofunctional epoxy compound was added dropwise to 1,3-cyclohexanedimethylamine within 1.5 h, and the two were mixed evenly at 40 °C; the molar ratio of the 1,3-cyclohexanedimethylamine to the monofunctional epoxy compound was 1:0.4.

[0071] (2) Then, the mixture obtained in step (1) is heated to 60°C and reacted for 3 hours to obtain monofunctional epoxy modified 1,3-cyclohexanedimethylamine.

[0072] (II) Preparation of a high-gloss grout curing agent suitable for application in humid environments

[0073] (1) Under nitrogen protection, the monofunctional epoxy modified 1,3-cyclohexanedimethylamine and the amine composition were mixed evenly at 40°C.

[0074] (2) After the bifunctional cyclic epoxy compound and the diluent are mixed evenly, they are added to the mixture obtained in step (1) in 5 portions and mixed evenly at 65°C.

[0075] (3) Keep at 65°C and let the mixture obtained in step (2) react for 3 hours to obtain a high-gloss grout curing agent that can be applied in a humid environment.

[0076] Example 4

[0077] The high-gloss grout curing agent for application in humid environments described in this invention is prepared from the following components in the following weight ratios:

[0078]

[0079] The amine composition comprises 80% N-cyclohexyl-1,3-propanediamine, 13.3% isofluranediamine, and 6.7% 4,4'-diaminodicyclohexylmethane by weight.

[0080] The monofunctional epoxy modified 1,3-cyclohexanedimethylamine is prepared by reacting 1,3-cyclohexanedimethylamine with a monofunctional epoxy compound at a molar ratio of 1:0.3; the monofunctional epoxy compound is prepared by mixing C8 glycidyl ether and decyl glycidyl ether at a mass ratio of 1:1.

[0081] The bifunctional cyclic epoxy compound is prepared by mixing hydrogenated bisphenol A type epoxy resin and 1,2-cyclohexanediol diglycidyl ether in a mass ratio of 1:1.

[0082] The diluent is chlorine-free benzyl alcohol.

[0083] A method for preparing a high-gloss grout hardener suitable for application in humid environments includes the following steps performed in sequence:

[0084] (I) Preparation of 1,3-cyclohexanedimethylamine modified with monofunctional epoxy compounds

[0085] (1) Under nitrogen protection, a monofunctional epoxy compound was added dropwise to 1,3-cyclohexanedimethylamine within 1 hour, and the two were mixed evenly at 40°C; the molar ratio of the 1,3-cyclohexanedimethylamine to the monofunctional epoxy compound was 1:0.3.

[0086] (2) Then, the mixture obtained in step (1) is heated to 60°C and reacted for 3 hours to obtain monofunctional epoxy modified 1,3-cyclohexanedimethylamine.

[0087] (II) Preparation of a high-gloss grout curing agent suitable for application in humid environments

[0088] (1) Under nitrogen protection, the monofunctional epoxy modified 1,3-cyclohexanedimethylamine and the amine composition were mixed evenly at 40°C.

[0089] (2) After the bifunctional cyclic epoxy compound and the diluent are mixed evenly, they are added to the mixture obtained in step (1) in 4 portions and mixed evenly at 60°C.

[0090] (3) Keep the temperature at 60°C and let the mixture obtained in step (2) react for 2 hours to obtain a high-gloss grout curing agent that can be applied in a humid environment.

[0091] Example 5

[0092] The high-gloss grout curing agent for application in humid environments described in this invention is prepared from the following components in the following weight ratios:

[0093]

[0094]

[0095] The amine composition comprises 85% N-cyclohexyl-1,3-propanediamine, 5% isofluranediamine, and 10% 4,4'-diaminodicyclohexylmethane by weight.

[0096] The monofunctional epoxy modified 1,3-cyclohexanedimethylamine is prepared by reacting 1,3-cyclohexanedimethylamine with a monofunctional epoxy compound in a molar ratio of 1:0.2; the monofunctional epoxy compound is prepared by mixing C8 glycidyl ether, decyl glycidyl ether and C11 glycidyl ether in a mass ratio of 1:1:1.

[0097] The bifunctional cyclic epoxy compound is composed of hydrogenated bisphenol A type epoxy resin, 1,2-cyclohexanediol diglycidyl ether, and 1,4-cyclohexanediethanol diglycidyl ether in a mass ratio of 1:1:1.

[0098] The diluent is chlorine-free benzyl alcohol.

[0099] A method for preparing a high-gloss grout hardener suitable for application in humid environments includes the following steps performed in sequence:

[0100] (I) Preparation of 1,3-cyclohexanedimethylamine modified with monofunctional epoxy compounds

[0101] (1) Under nitrogen protection, a monofunctional epoxy compound was added dropwise to 1,3-cyclohexanedimethylamine over 1.5 h, and the two were mixed evenly at 35 °C; the molar ratio of the 1,3-cyclohexanedimethylamine to the monofunctional epoxy compound was 1:0.2.

[0102] (2) Then, the mixture obtained in step (1) is heated to 55°C and reacted for 3 hours to obtain monofunctional epoxy modified 1,3-cyclohexanedimethylamine.

[0103] (II) Preparation of a high-gloss grout curing agent suitable for application in humid environments

[0104] (1) Under nitrogen protection, the monofunctional epoxy modified 1,3-cyclohexanedimethylamine and the amine composition were mixed evenly at 40°C.

[0105] (2) After the bifunctional cyclic epoxy compound and the diluent are mixed evenly, they are added to the mixture obtained in step (1) in 5 portions and mixed evenly at 60°C.

[0106] (3) Keep the temperature at 60°C and let the mixture obtained in step (2) react for 2 hours to obtain a high-gloss grout curing agent that can be applied in a humid environment.

[0107] Example 6

[0108] The high-gloss grout curing agent for application in humid environments described in this invention is prepared from the following components in the following weight ratios:

[0109]

[0110] The amine composition comprises 80% N-cyclohexyl-1,3-propanediamine and 20% isofluranediamine by weight.

[0111] The monofunctional epoxy modified 1,3-cyclohexanedimethylamine is prepared by reacting 1,3-cyclohexanedimethylamine with a monofunctional epoxy compound at a molar ratio of 1:0.3; the monofunctional epoxy compound is prepared by mixing decyl glycidyl ether and dodecyl glycidyl ether at a mass ratio of 1:1.

[0112] The bifunctional cyclic epoxy compound is composed of hydrogenated bisphenol A type epoxy resin and 1,2-cyclohexanediol diglycidyl ether in a mass ratio of 4:1.

[0113] The diluent is chlorine-free benzyl alcohol.

[0114] A method for preparing a high-gloss grout hardener suitable for application in humid environments includes the following steps performed in sequence:

[0115] (I) Preparation of 1,3-cyclohexanedimethylamine modified with monofunctional epoxy compounds

[0116] (1) Under nitrogen protection, a monofunctional epoxy compound was added dropwise to 1,3-cyclohexanedimethylamine within 1 hour, and the two were mixed evenly at 40°C; the molar ratio of the 1,3-cyclohexanedimethylamine to the monofunctional epoxy compound was 1:0.3.

[0117] (2) Then, the mixture obtained in step (1) is heated to 60°C and reacted for 1 hour to obtain monofunctional epoxy modified 1,3-cyclohexanedimethylamine.

[0118] (II) Preparation of a high-gloss grout curing agent suitable for application in humid environments

[0119] (1) Under nitrogen protection, the monofunctional epoxy modified 1,3-cyclohexanedimethylamine and the amine composition were mixed evenly at 40°C.

[0120] (2) After the bifunctional cyclic epoxy compound and the diluent are mixed evenly, they are added to the mixture obtained in step (1) in 4 portions and mixed evenly at 65°C.

[0121] (3) Maintain 65℃ and allow the mixture obtained in step (2) to react for 1-3 hours to obtain a high-gloss grout curing agent suitable for application in humid environments. Experimental data:

[0122] Comparative sample: mainly prepared from the following components in the following weight ratios:

[0123] (1) Under nitrogen protection, 20 parts of polyetheramine and 25 parts of 1,3-cyclohexanedimethylamine were mixed evenly at 40°C.

[0124] (2) Mix 25 parts of bisphenol A epoxy resin and 30 parts of benzyl alcohol and add them in 4 portions to the mixture obtained in step (1) at 60°C, and mix them evenly.

[0125] (3) Keep the mixture from step (2) at 65°C and react for 2 hours to obtain the comparative sample grout curing agent.

[0126] Detection method:

[0127] Viscosity: Tested according to GB / T 22235-2008;

[0128] The viscosity of the comparative sample and each example was tested separately. Then, it was mixed with epoxy resin E51 at a mass ratio of 1:1 to prepare a tile grout, and the following performance tests were performed:

[0129] Compression and shear strength: tested according to JC 887-2001;

[0130] Elongation at break: Tested according to GB / T 2567-2008;

[0131] Odor rating: Tested according to GB / T 36797-2018;

[0132] Gloss: Tested according to GB / T 36797-2018;

[0133] Moisture-cured gloss retention rate: tested according to GB / T 36797-2018;

[0134] Yellowing resistance: Tested according to GB / T 36797-2018.

[0135] The test results are as follows:

[0136] Table 1. Performance test results of various tile grouts

[0137]

[0138] As shown in the table above, the high-gloss grout curing agent of this application, which can be applied in humid environments, has lower viscosity, higher bonding strength (reflected by the compressive shear strength parameter), higher elongation at break, less odor, better resistance to yellowing, and maintains a high level of gloss under humid curing conditions. Furthermore, considering all factors, Example 6 is the optimal solution. Compared to the control sample (bisphenol A epoxy resin modified, general-purpose tile grout curing agent), the tile grout prepared by the curing agent in this embodiment has a 50.8% higher gloss, a 172% higher wet-curing gloss, and a retention rate as high as 85%. This effectively reduces the impact of environmental humidity on the gloss of the tile grout, avoiding gloss loss, whitening, and discoloration caused by construction in humid environments. The yellowing resistance δE is increased by more than 5 times, allowing the curing agent to be used in light-colored tile grout formulations to meet customers' requirements for yellowing resistance in tile grout applied to balconies, windowsills, and other areas exposed to direct sunlight. The compressive shear strength and elongation at break are increased by 35.86% and 294% respectively. While the toughness is significantly increased, the compressive shear strength is also slightly increased, eliminating the problem of cracking and peeling due to insufficient toughness during long-term use. The odor level is generally lower than that of products prepared with conventional tile grout curing agents, making it friendly to workers and the environment.

Claims

1. A high-gloss grout curing agent suitable for application in humid environments, characterized in that: It is mainly prepared from the following components in the following weight ratios: 15-25 parts of amine composition 20-30 parts of monofunctional epoxy modified 1,3-cyclohexanedimethylamine 25-35 parts of bifunctional cyclic epoxide 20-35 parts diluent; The amine composition comprises 70-90% N-cyclohexyl-1,3-propanediamine by weight. The monofunctional epoxy modified 1,3-cyclohexanedimethylamine is prepared by reacting 1,3-cyclohexanedimethylamine with a monofunctional epoxy compound in a molar ratio of 1:0.2-1:0.4; the monofunctional epoxy compound is one of C8 glycidyl ether, decyl glycidyl ether, or C11 glycidyl ether, or any combination of two or more of them. The difunctional cyclic epoxy compound is one or any combination of two or more of the following: hydrogenated bisphenol A type epoxy resin, 1,2-cyclohexanediol diglycidyl ether, and 1,4-cyclohexanediethanol diglycidyl ether. In addition to N-cyclohexyl-1,3-propanediamine, the amine composition also includes one or both of isofluranediamine or 4,4'-diaminodicyclohexylmethane.

2. The high-gloss grout curing agent for application in humid environments according to claim 1, characterized in that: The diluent is chlorine-free benzyl alcohol.

3. The preparation method of the high-gloss grout curing agent capable of being applied in humid environments according to claim 1 or 2, characterized in that: The steps are as follows, performed in sequence: (a) Preparation of 1,3-cyclohexanedimethylamine modified with monofunctional epoxy compounds (1) Under nitrogen protection, add monofunctional epoxy compound dropwise to 1,3-cyclohexanedimethylamine within 0.5-1.5h, and mix the two evenly at 30-40℃; the molar ratio of 1,3-cyclohexanedimethylamine to monofunctional epoxy compound is 1:0.2-1:0.

4. (2) Then the mixture obtained in step (1) is heated to 50-60℃ and reacted for 1-3h to obtain monofunctional epoxy modified 1,3-cyclohexanedimethylamine. (II) Preparation of a high-gloss grout curing agent suitable for application in humid environments (1) Under nitrogen protection, the monofunctional epoxy modified 1,3-cyclohexanedimethylamine and the amine composition are mixed evenly at 30-40°C; (2) After the bifunctional cyclic epoxy compound and the diluent are mixed evenly, they are added to the mixture obtained in step (1) in 3-5 portions and mixed evenly at 55-65℃; (3) Keep the temperature at 55-65℃ and let the mixture obtained in step (2) react for 1-3 hours to obtain a high-gloss grout curing agent that can be applied in a humid environment.

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