High-pressure-resistant high-toughness modified epoxy coating composition as well as preparation method and application thereof

Abstract

The invention discloses a high-pressure-resistant high-toughness modified epoxy coating composition as well as a preparation method and application thereof. The modified epoxy coating composition comprises a base material and a curing agent, the base material comprises epoxy resin, toughened resin and filler; the curing agent comprises flexible aliphatic amine, and the flexible aliphatic amine is prepared by reaction of flexible amine, aliphatic ketone and formic acid. The preparation method comprises the following steps: mixing epoxy resin, toughened resin, a filler and an additive which is selectively added or not added to form a base material; flexible amine and aliphatic ketone react to form a flexible aliphatic amine intermediate, formic acid is added for reduction, flexible aliphatic amine is obtained, and a curing agent is prepared; mixing and reacting the base material and the curing agent to prepare the modified epoxy coating composition. The modified epoxy coating composition provided by the invention has the advantages of good paint film toughness, strong corrosion resistance, good adhesive force and long working life, improves the pressure resistance of the epoxy coating on a structural member, and can be applied to the field of surface corrosion prevention of the structural member, especially to the surface of a negative pressure cabin, a ballast tank or a steel structure.

Description

Technical Field

[0001] The invention belongs to the technical field of epoxy coatings, and specifically relates to a high-pressure-resistant and high-toughness modified epoxy coating composition and a preparation method and application thereof. Background Art

[0002] Safety is the prerequisite for the development of nuclear power. Currently, nuclear power construction uses safer and more advanced third-generation nuclear power units. The uranium nuclear fuel of a nuclear power plant undergoes fission in the "reactor" equipment to generate a large amount of heat energy. High-pressure water takes out the heat energy and generates steam in the steam generator. The steam drives the turbine to rotate with the generator, and electricity can be generated continuously. The third-generation nuclear power plant has higher technical requirements for the safety of coatings than the first two types of nuclear power plants. The coatings are required to have good radiation resistance and protection capabilities while being decorative. However, most of the existing related coatings are used in second-generation nuclear power plants, and their performance is difficult to meet the standards of third-generation nuclear power plants.

[0003] As we all know, traditional epoxy coatings have the following characteristics: good adhesion and ultra-high wear resistance; excellent dielectric corrosion resistance and electrical insulation performance; good anti-corrosion performance, the coating also has extremely strong durability and heat resistance, and the curing method is simple, so epoxy coatings are widely used in heavy anti-corrosion engineering machinery and other fields. At the same time, because epoxy coatings have a certain resistance to high-dose radiation, and its benzene ring structure has an anti-electron activation effect, it is used in nuclear power plants. At present, the toughness of conventional epoxy is poor, especially at the position of the yin and yang corners, which is prone to adhesion loss and bulging when pressure changes. It is easy to fall off over time and cannot meet the requirements of large-scale construction. However, the paint coatings in the third-generation nuclear power plants require higher requirements in terms of anti-cracking and non-powdering and falling off under the premise of radiation resistance. Therefore, the development of an epoxy resin composition with a long application period, good anti-corrosion coating performance and good toughness is of great significance to the field of surface coating and anti-corrosion. Summary of the invention

[0004] The main purpose of the present invention is to provide a high-pressure resistant and high-toughness modified epoxy coating composition and a preparation method and application thereof, so as to overcome the shortcomings of the prior art.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes: One aspect of the present invention provides a high-pressure resistant and high-toughness modified epoxy coating composition, which comprises: a base material and a curing agent; the base material comprises an epoxy resin, a toughening resin and a filler; the curing agent comprises a flexible fatty amine, wherein the flexible fatty amine is prepared by reacting a flexible amine, a fatty ketone and formic acid.

[0006] Furthermore, the mass ratio of the base material to the curing agent is (2-4): (1-3).

[0007] Furthermore, the base material also includes an auxiliary agent.

[0008] Furthermore, the base material includes the following components calculated in parts by weight: 35-45 parts of epoxy resin, 4-10 parts of toughening resin, 55-70 parts of filler, and 0-5 parts of auxiliary agent.

[0009] Furthermore, the raw materials for preparing the curing agent include the following components calculated by weight: 88-98 parts of flexible amine, 2-12 parts of fatty ketone, and 0.001-0.05 parts of formic acid.

[0010] Another aspect of the present invention provides a method for preparing the high-pressure resistant and high-toughness modified epoxy coating composition, which comprises: Mixing epoxy resin, toughening resin, filler and optionally added additives to form a base material; The flexible amine and the fatty ketone are reacted to form a flexible fatty amine intermediate, and then formic acid is added to reduce the flexible fatty amine to obtain a curing agent; The base material and the curing agent are mixed and reacted to obtain the high-pressure-resistant and high-toughness modified epoxy coating composition.

[0011] Another aspect of the present invention provides a coating formed by curing the modified epoxy coating composition having high pressure resistance and high toughness.

[0012] Another aspect of the present invention provides the use of the high-pressure resistant and high-toughness modified epoxy coating composition or the aforementioned coating in the field of corrosion protection of structural parts surface.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: (1) The high-pressure resistant and high-toughness modified epoxy coating composition provided by the present invention can significantly improve the toughness of the paint film and increase the tensile elongation by introducing a flexible amine modified by aliphatic ketone into the curing agent.

[0014] (2) The high-pressure and high-toughness modified epoxy coating composition provided by the present invention has the characteristics of strong corrosion resistance and good adhesion, which improves the pressure resistance of the epoxy coating on the structural parts; at the same time, it prolongs the applicable period of the epoxy coating, greatly increases the construction window, improves work efficiency, and reduces construction costs. DETAILED DESCRIPTION

[0015] In view of the above problems existing in the prior art, after extensive and in-depth research, the inventors of the present invention provide a high-pressure resistant and high-toughness modified epoxy coating composition and a preparation method and application thereof.

[0016] The technical solution, its implementation process and principle will be further explained as follows.

[0017] As one aspect of the technical solution of the present invention, a high-pressure resistant and high-toughness modified epoxy coating composition is provided, which includes a base material and a curing agent; the base material includes an epoxy resin, a toughening resin and a filler; the curing agent includes a flexible fatty amine, wherein the flexible fatty amine is prepared by reacting a flexible amine, a fatty ketone and formic acid.

[0018] The key technical means of the technical solution provided by the present invention is to modify the flexible amine with a fatty ketone reaction. During the reaction process, the amine in the flexible amine and the fatty ketone undergo a Leuckart-Wallach reaction, and some of the reactions form secondary amines and tertiary amines, and some of the primary amines are consumed, so that the later reaction rate is reduced, thereby increasing the applicable period; at the same time, the long-chain structure of the fatty ketone is connected to the flexible amine, which provides a more obvious improvement in elongation, giving the entire structure stronger toughness; at the same time, the extended flexible amine has an amine at the far end of the branch chain for reaction, so the strength of the three-dimensional structure is also greatly improved compared with before. With the dual improvement of elongation and strength, the toughness of the entire paint film is significantly improved.

[0019] In some embodiments, the mass ratio of the base material to the curing agent is (2-4): (1-3).

[0020] In some embodiments, the base further includes an auxiliary agent.

[0021] Preferably, the base material includes the following components calculated in parts by weight: 35-45 parts of epoxy resin, 4-10 parts of toughening resin, 55-70 parts of filler, and 0-5 parts of additive.

[0022] In some embodiments, the epoxy resin may include E51 epoxy resin, but is not limited thereto.

[0023] In some embodiments, the toughening resin may include any one or a combination of two or more of rubber, thermoplastic resin, long-chain aliphatic compound, etc., but is not limited thereto.

[0024] In some preferred embodiments, the toughening resin may include any one of a thermoplastic resin, a long-chain aliphatic compound, or a combination of two thereof, and a long-chain aliphatic compound is particularly preferred.

[0025] In some embodiments, the long-chain aliphatic compound may include, but is not limited to, any one or a combination of two or more of AGE, 1,6-hexanediol diglycidyl ether, 1,4-butanediol diglycidyl ether, etc., preferably 1,6-hexanediol diglycidyl ether, because of its moderate chain length, it can achieve a balanced improvement in elongation and strength after reacting with amines.

[0026] In some embodiments, the filler may include any one or a combination of two or more of aluminum tripolyphosphate, zinc tripolyphosphate, precipitated barium sulfate, red iron oxide, quartz powder, etc., but is not limited thereto.

[0027] In some embodiments, the auxiliary agent may include any one or a combination of two or more of BYK161, PMA, Tego 904W, etc., but is not limited thereto.

[0028] In some embodiments, the raw materials for preparing the curing agent include the following components calculated in parts by weight: 88-98 parts of flexible amine, 2-12 parts of fatty ketone, and 0.001-0.05 parts of formic acid.

[0029] In some embodiments, the flexible amine includes an epoxy curing agent having high elongation.

[0030] In some more preferred embodiments, the flexible amine may include but is not limited to any one or a combination of two or more of EPEH-2588, H-120, BS845, etc., and EPEH-2588 is particularly preferred. EPEH-2588 is a customized high-elongation epoxy curing agent, which has an improved elongation compared to other curing agents, but the negative effect is that the strength is poor. Therefore, the present invention performs secondary modification on it to improve the strength, which is a better choice in the present invention, but this does not mean that other high-elongation epoxy curing agents are completely out of the scope of the present invention.

[0031] Furthermore, the fatty ketone may include any one of diacetyl, pentanedione, tripentanone, etc., or a combination of two or more thereof, preferably pentanedione. This is because pentanedione has a longer main chain structure, which can provide better flexibility. Compared with diacetyl, its rigidity is slightly reduced, but it performs outstandingly under high pressure; pentanedione has two reaction sites, which can consume more primary amines, thereby extending the applicability of the prepared high-pressure resistant and high-toughness modified epoxy coating composition, which is beneficial to on-site construction.

[0032] As another aspect of the technical solution of the present invention, a method for preparing a high-pressure resistant and high-toughness modified epoxy coating composition is provided, comprising: Mixing epoxy resin, toughening resin, filler and optionally added additives to form a base material; The flexible amine and the fatty ketone are reacted to form a flexible fatty amine intermediate, and then formic acid is added to reduce the flexible fatty amine to obtain a curing agent; The base material and the curing agent are mixed and reacted to obtain the high-pressure-resistant and high-toughness modified epoxy coating composition.

[0033] In some more specific embodiments, the preparation method specifically comprises: Allowing a mixture of a flexible amine and a fatty ketone to react at 40-60° C. for 2-6 hours to form a flexible fatty amine intermediate, and performing a dehydration treatment; Then, formic acid is added, and the mixture is stirred at 50-60° C. for 3-8 hours to reduce the flexible fatty amine intermediate to a flexible fatty amine, thereby obtaining the curing agent.

[0034] In some embodiments, the mass ratio of the flexible amine, the fatty ketone and the formic acid is 88-98: 2-12: 0.001-0.05.

[0035] In some more specific embodiments, the preparation method of the flexible fatty amine in the preparation method may include the following steps ad: a. Add the flexible amine to the reactor; b. Pentanedione is gradually added dropwise in a stirring device while stirring, the temperature is controlled at 40-60° C., and the addition process lasts for 2-6 hours to obtain a flexible fatty amine intermediate; c. Dehydration treatment; d. Gradually add formic acid dropwise to the flexible fatty amine intermediate while stirring, control the temperature at 50-60°C, continue the addition process for 3-8 hours, and cool to room temperature to obtain a flexible fatty amine.

[0036] As another aspect of the technical solution of the present invention, a coating formed by curing the modified epoxy coating composition with high pressure resistance and high toughness is provided, and the thickness of the coating is between 200 μm and 2 mm.

[0037] As another aspect of the technical solution of the present invention, it also provides the application of the high-pressure resistant and high-toughness modified epoxy coating composition or the coating formed by curing the high-pressure resistant and high-toughness modified epoxy coating composition in the field of corrosion protection of structural parts surface.

[0038] Furthermore, the application includes application in negative pressure tanks, ballast tanks or steel structure surfaces, but is not limited thereto.

[0039] In summary, the high-pressure resistant and high-toughness modified epoxy coating composition provided by the present invention can greatly improve the toughness of the paint film and increase the tensile elongation by introducing a flexible amine modified by aliphatic ketone into the curing agent; and has the characteristics of strong corrosion resistance and good adhesion, thereby improving the pressure resistance of the epoxy coating on structural parts; at the same time, it prolongs the applicable period of the epoxy coating, greatly increases the construction window, improves work efficiency, and reduces construction costs.

[0040] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with embodiment. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Those skilled in the art can make modifications or equivalent substitutions based on the understanding of the technical scheme of the present invention without departing from the spirit and scope of the technical scheme of the present invention, and all should be included in the protection scope of the present invention.

[0041] If the specific experimental steps or conditions are not specified in the embodiments, the operation or conditions of the conventional experimental steps described in the literature in this field can be carried out. If the manufacturer of the reagents or instruments used is not specified, they can be obtained commercially. Exemplary, the raw materials used in the following embodiments are as follows: barium sulfate is a product of Taixiang Company, model AB-03N, which is 4000 mesh precipitated barium sulfate. The commercial selection of the remaining raw materials not mentioned is all conventional selection, and does not involve the core technical means of the present invention.

[0042] Example 1 This embodiment provides a modified epoxy coating composition with high pressure resistance and high toughness, wherein the mass ratio of the base material to the curing agent is 2:1, and the base material includes the following raw materials in parts by weight: 35 parts of epoxy resin, 5 parts of toughening resin, 55 parts of filler, and 5 parts of additives.

[0043] The epoxy resin is E-51 epoxy resin, and NPEL-128 from Nan Ya Epoxy Resin Company is selected; the toughening resin is AGE epoxy active diluent, the filler is aluminum tripolyphosphate, precipitated barium sulfate, and red iron oxide; the additives are BYK161, PMA, and Tego 904W.

[0044] The curing agent includes the following raw materials in parts by weight: 90 parts of flexible amine, 9.98 parts of fatty ketone, and 0.02 parts of formic acid.

[0045] The flexible amine is selected from the EPEH-2588 high-elongation epoxy curing agent of Complex High-Tech, and the aliphatic ketone is diacetyl.

[0046] The preparation method of the curing agent is: Add diacetyl gradually into the reactor containing the flexible amine, stir thoroughly, control the temperature at 50°C, continue to heat and mix for 3 hours after stirring to react, and perform a dehydration treatment. Then slowly add formic acid, control the temperature at 55°C, and stir at a low speed for 4 hours to obtain the curing agent.

[0047] Example 2 The other operations of this embodiment are the same as those of Embodiment 1, except that the toughening resin is 1,6-hexanediol diglycidyl ether.

[0048] Example 3 The other operations of this embodiment are the same as those of embodiment 1, except that the fatty ketone is pentanedione.

[0049] Example 4 The other operations of this embodiment are the same as those of embodiment 1, except that the curing agent includes the following raw materials in parts by weight: 95 parts of flexible amine, 4.98 parts of fatty ketone, and 0.02 parts of formic acid.

[0050] Example 5 The other operations of this embodiment are the same as those of Example 4, except that the mass ratio of the base material to the curing agent is 4:1.

[0051] Example 6 The other operations of this embodiment are the same as those of Example 4, except that the mass ratio of the base material to the curing agent is 2:3.

[0052] Example 7 The other operations of this embodiment are the same as those of Example 4, except that the base material includes the following raw materials in parts by weight: 40 parts of epoxy resin, 5 parts of toughening resin, 50 parts of filler, and 5 parts of additives.

[0053] Example 8 The other operations of this embodiment are the same as those of Example 4, except that: the flexible amine uses BS845 curing agent.

[0054] Example 9 The other operations of this embodiment are the same as those of Example 4, except that the toughening resin is polyetheretherketone.

[0055] Example 10 The other operations of this embodiment are the same as those of Example 4, except that the toughening resin is 1,4-butanediol diglycidyl ether.

[0056] Embodiment 11 The other operations of this embodiment are the same as those of Example 4, except that the fatty ketone is pentatrione.

[0057] Example 12 The other operations of this embodiment are the same as those of Example 4, except that the preparation method of the curing agent is: Pentanedione was gradually added into the reaction kettle containing flexible amine, fully stirred, the temperature was controlled at 40°C, and the mixture was kept warm for 3 hours to react, and a dehydration treatment was performed. The temperature was controlled at 50°C, and the mixture was stirred at a low speed for 4 hours to obtain the curing agent.

[0058] Example 13 The other operations of this embodiment are the same as those of Example 4, except that the preparation method of the curing agent is: Pentanedione was gradually added into the reaction kettle containing flexible amine, fully stirred, the temperature was controlled at 60°C, and the mixture was kept warm for 3 hours to react, and a dehydration treatment was performed. The temperature was controlled at 60°C and stirred at a low speed for 4 hours to obtain the curing agent.

[0059] Comparative Example 1 This comparative example provides a high-pressure resistant and high-toughness modified epoxy coating composition, wherein the mass ratio of the base material to the curing agent is 2:1, and the base material includes the following raw materials in parts by weight: 40 parts of epoxy resin, 55 parts of filler, and 5 parts of additives.

[0060] The epoxy resin is E-51 epoxy resin, and NPEL-128 from Nan Ya Epoxy Resin Company is selected; the fillers are aluminum tripolyphosphate, precipitated barium sulfate, and red iron oxide; and the additives are BYK161, PMA, and Tego 904W.

[0061] The curing agent includes the following raw materials in parts by weight: 100 parts of flexible amine, wherein the flexible amine is selected from EPEH-2588 high elongation epoxy curing agent produced by Complex High-Tech.

[0062] Comparative Example 2 The other operations of this comparative example are the same as those of comparative example 1, except that the base material includes the following raw materials in parts by weight: 35 parts of epoxy resin, 5 parts of toughening resin, 55 parts of filler, and 5 parts of additives.

[0063] The toughening resin is 1,6-hexanediol diglycidyl ether.

[0064] The curing agent includes the following raw materials in parts by weight: 100 parts of flexible amine, wherein the flexible amine is selected from EPEH-2588 high elongation epoxy curing agent produced by Complex High-Tech.

[0065] Comparative Example 3 The other operations of this comparative example are the same as those of comparative example 2, except that the toughening resin is an AGE epoxy reactive diluent.

[0066] Comparative Example 4 The other operations of this comparative example are the same as those of comparative example 2, except that the base material includes the following raw materials in parts by weight: 35 parts of epoxy resin, 5 parts of toughening resin, 55 parts of filler, and 5 parts of auxiliary agent. The toughening resin is 1,6-hexanediol diglycidyl ether.

[0067] The curing agent includes the following raw materials in parts by weight: 98 parts of flexible amine, 1.98 parts of fatty ketone, and 0.02 parts of formic acid.

[0068] Comparative Example 5 The other operations of this comparative example are the same as those of comparative example 4, except that the curing agent includes the following raw materials in parts by weight: 85 parts of flexible amine, 14.98 parts of fatty ketone, and 0.02 parts of formic acid.

[0069] Comparative Example 6 The other operations of this comparative example are the same as those of comparative example 4, except that the curing agent includes the following raw materials in parts by weight: 95 parts of flexible amine and 5 parts of fatty ketone.

[0070] The hardness, adhesion and pot life tests were performed on the coatings after mixing and applying according to the mass ratio of the base material and the curing agent in Examples 1-13 of the present invention and Comparative Examples 1-6. The test results are shown in Table 1.

[0071] Table 1 Test results of Examples 1-13 and Comparative Examples 1-6

[0072] The test basis is as follows: the applicable period is tested according to GB / T31416-2015, the hardness is tested according to GB / T6739-2022, the elongation at break is tested according to ISO527-2-2012, the adhesion is tested according to GB / T5210-2006, and the simulated DBA experiment is tested according to NB / T 20133.2-2012.

[0073] As a control case, Control Example 1 does not contain a toughening resin and the flexible amine is not modified with fatty ketone. Although its hardness is relatively high, its applicable period is not only relatively short, but also its elongation at break and adhesion are relatively low. This shows that the typical implementation case represented by Example 4 can not only achieve the effect of extending the applicable period of the coating, but also significantly improve various comprehensive performances.

[0074] Compared with Control Example 1, the application period of Control Example 2 is significantly improved, and the elongation is also significantly improved. This is because the toughening resin 1,6-hexanediol diglycidyl ether in the base material can provide a good elongation rate, so the elongation at break of the coating is also better, but the coating still bubbles and cracks.

[0075] Compared with Control Example 2, the elongation at break and adhesion of the coating in Control Example 3 are slightly improved because the AGE chain length is longer than that of 1,6-hexanediol diglycidyl ether, so the cross-linking density is lower and it is softer. In the DBE test, the coating only bubbles but does not crack.

[0076] Compared with the control example 3, the embodiment 1 introduces diacetyl modification and performs a pre-reaction to synthesize the fatty flexible amine, so the hardness of the coating decreases.

[0077] Compared with Example 1, Example 2 uses 1,6-hexanediol diglycidyl ether, which has a higher crosslinking density and improves the elongation at break of the coating.

[0078] Compared with Example 2, Example 3 uses pentanedione for modification. The improvement of its elongation is due to the use of pentanedione as a fatty amine for modification. While maintaining the same reaction points, the main chain length is improved, and the cross-linked spatial network structure is more elastic, which can significantly improve the elongation at break of the coating.

[0079] Compared with Example 3, Example 4 reduces the content of pentanedione and the amount of flexible amine, thereby shortening the application period. At the same time, the hardness of the coating is significantly improved, and the coating does not bubble or crack.

[0080] In Example 5, compared with Example 4, the proportion of the curing agent is reduced, so the effect of extending the coating application period and improving the elongation at break brought by the flexible amine is reduced, and the coating does not bubble or crack.

[0081] Compared with Example 4, Example 6 has a lower proportion of base material and slightly more flexible amine, which improves the elongation of the coating, but reduces the adhesion, and the coating does not bubble or crack.

[0082] In Example 7, compared with Example 4, the proportion of epoxy resin in the base material is increased, and the amount of reaction is increased, so the application period of the coating is shortened, and the coating does not bubble or crack.

[0083] In Example 8, compared with Example 4, the curing agent is changed to BS845, which is not flexible enough compared with 2588, so the elongation at break of the coating decreases, and the coating does not bubble or crack.

[0084] Compared with Example 4, the toughening resin in Example 9 is polyetheretherketone, which is not flexible enough, so the elongation at break of the coating is also lower than that of Example 4, and the coating does not bubble or crack.

[0085] In Example 10, compared with Example 4, the toughening resin is replaced with 1,4-butanediol diglycidyl ether, which has a shorter overall chain length and thus provides lower flexibility. Therefore, the elongation at break of the coating is also lower, and the coating does not bubble or crack.

[0086] Compared with Example 4, Example 11 uses pentatrione for modification, with more reaction points, but shorter chain length and higher cross-linking density, so the elongation at break of the coating is reduced. At the same time, the adhesion is greatly improved, so the coating does not bubble or crack.

[0087] In Example 12, compared with Example 4, the reaction temperature of the curing agent is lower, and the formic acid cannot fully catalyze the reaction. The reaction degree is insufficient, resulting in insufficient amount of flexible amine, so the elongation at break of the coating decreases, and the coating does not bubble or crack.

[0088] Compared with Example 4, Example 13 has a higher reaction temperature of the curing agent, an excessively high reaction degree, and an excessive amount of flexible amine, so the applicable period of the coating is extended, but the adhesion is reduced, and the coating does not bubble or crack.

[0089] Compared with Example 2, Example 3 modified the flexible amine with aliphatic ketone, which resulted in a significant increase in the coating's applicability period, a slight increase in elongation at break and adhesion, but a decrease in hardness. The main reason should be that diacetyl was used for modification, which indeed reduced the reactivity and extended the applicability period.

[0090] Compared with Example 4, the content of pentanedione in Control Example 4 is further reduced, and a sufficient amount of flexible amine cannot be obtained, so the application life of the coating cannot be improved.

[0091] Compared with Example 3, the content of pentanedione in Control Example 5 is further increased. Excessive flexible amine leads to excessive extension of the application period of the coating and poor overall hardness of the paint film.

[0092] Compared with Example 4, Comparative Example 6 did not add formic acid for modification, so that the flexible amine intermediate could not continue to react, and no amine product was obtained, and thus could not react with the base material.

[0093] It can be seen from the above representative embodiments and comparative embodiments that the high-pressure resistant and high-toughness modified epoxy coating composition provided by the embodiments of the present invention, by introducing fatty ketone into the flexible amine for modification to form a flexible fatty amine, can extend the applicability period of the high-pressure resistant epoxy coating, greatly increase the construction window, and improve work efficiency; increase flexibility, release the stress of the paint film under high pressure, disperse the pressure, and increase adhesion; at the same time, it has the characteristics of strong corrosion resistance and good adhesion.

[0094] In addition, the inventors of this case also referred to the aforementioned embodiments and conducted experiments with other raw materials, process operations, and process conditions described in this specification, and obtained relatively ideal results.

[0095] Although the present invention has been described with reference to illustrative embodiments, it will be appreciated by those skilled in the art that various other changes, omissions and / or additions may be made and that elements of the described embodiments may be substituted with substantial equivalents without departing from the spirit and scope of the present invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present invention without departing from the scope of the present invention. Therefore, it is not intended herein to limit the present invention to the disclosed specific embodiments for carrying out the present invention, but rather it is intended that the present invention will include all embodiments within the scope of the appended claims.

Claims

1. A modified epoxy coating composition with high pressure resistance and high toughness, characterized in that: The invention comprises a base material and a curing agent; the base material comprises epoxy resin, toughening resin and filler; the curing agent comprises flexible fatty amine, wherein the flexible fatty amine is prepared by reacting flexible amine, fatty ketone and formic acid.

2. The high-pressure-resistant and high-toughness modified epoxy coating composition according to claim 1, characterized in that: The mass ratio of the base material to the curing agent is (2-4): (1-3).

3. The high-pressure-resistant and high-toughness modified epoxy coating composition according to claim 1, characterized in that: The base material also includes an auxiliary agent; Preferably, the base material includes the following components calculated in parts by weight: 35-45 parts of epoxy resin, 4-10 parts of toughening resin, 55-70 parts of filler, and 0-5 parts of additive.

4. The high-pressure-resistant and high-toughness modified epoxy coating composition according to claim 3, characterized in that: The epoxy resin includes E51 epoxy resin; And / or, the toughening resin includes any one of rubber, thermoplastic resin, and long-chain aliphatic compound, or a combination of two or more thereof; preferably, the toughening resin includes any one of thermoplastic resin and long-chain aliphatic compound, or a combination of two or more thereof, and a long-chain aliphatic compound is particularly preferred; Preferably, the long-chain aliphatic compound includes any one or a combination of two or more of AGE, 1,6-hexanediol diglycidyl ether, and 1,4-butanediol diglycidyl ether, and 1,6-hexanediol diglycidyl ether is particularly preferred; And / or, the filler includes any one of aluminum tripolyphosphate, zinc tripolyphosphate, precipitated barium sulfate, red iron oxide, and quartz powder, or a combination of two or more thereof; And / or, the additive includes any one of BYK161, PMA, Tego 904W or a combination of two or more thereof.

5. The high-pressure-resistant and high-toughness modified epoxy coating composition according to claim 1, characterized in that: The raw materials for preparing the curing agent include the following components calculated by weight: 88-98 parts of flexible amine, 2-12 parts of fatty ketone, and 0.001-0.05 parts of formic acid.

6. The high-pressure-resistant and high-toughness modified epoxy coating composition according to claim 1, characterized in that: The flexible amine includes an epoxy curing agent having a high elongation; Preferably, the flexible amine includes any one or a combination of two or more of EPEH-2588, H-120, and BS845, and EPEH-2588 is particularly preferred; And / or, the aliphatic ketone includes any one of diacetyl, pentanedione, and tripentanone, or a combination of two or more thereof, preferably pentanedione.

7. The method for preparing the high-pressure-resistant and high-toughness modified epoxy coating composition according to any one of claims 1 to 6, characterized in that: include: Mixing epoxy resin, toughening resin, filler and optionally added additives to form a base material; The flexible amine and the fatty ketone are reacted to form a flexible fatty amine intermediate, and then formic acid is added to reduce the flexible fatty amine to obtain a curing agent; The base material and the curing agent are mixed and reacted to obtain the high-pressure-resistant and high-toughness modified epoxy coating composition.

8. The preparation method according to claim 7, characterized in that: include: Allowing a mixture of a flexible amine and a fatty ketone to react at 40-60° C. for 2-6 hours to form a flexible fatty amine intermediate, and performing a dehydration treatment; Then, formic acid is added, and the mixture is stirred at 50-60° C. for 3-8 hours to reduce the flexible fatty amine intermediate to a flexible fatty amine to obtain the curing agent; Preferably, the mass ratio of the flexible amine, the fatty ketone and the formic acid is 88-98:2-12:0.001-0.

05.

9. A coating formed by curing the modified epoxy coating composition having high pressure resistance and high toughness according to any one of claims 1 to 6, characterized in that: The thickness of the coating is between 200 μm and 2 mm.

10. Use of the high-pressure resistant and high-toughness modified epoxy coating composition according to any one of claims 1 to 6 or the coating according to claim 9 in the field of surface corrosion protection of structural parts; Preferably, the application includes application in a negative pressure tank, a ballast tank or a steel structure surface.

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