A wear-resistant and corrosion-resistant nano-ceramic composite coating and its preparation method and application

Abstract

The present invention discloses a novel wear-resistant and corrosion-resistant nano-ceramic composite coating, its preparation method, and application. The composite coating comprises a ceramic resin main material and a curing auxiliary material, wherein the weight of the curing auxiliary material is 8.2-9.0% of the weight of the ceramic resin main material. The ceramic resin main material comprises the following raw materials, measured in parts by weight: 23-27 parts of nano-ceramic powder, 11-14 parts of modified ceramic fiber, 56-63 parts of epoxy resin, 1.8-2.7 parts of organic bentonite, 1.7-2.3 parts of a composite leveling agent, and 20-24 parts of a composite diluent. The curing auxiliary material comprises the following raw materials, measured in parts by weight: 7.5-9.5 parts of a polyamide curing agent and 1.8-2.2 parts of dicyclohexylmethane diisocyanate. The ceramic resin main material and the curing auxiliary material are thoroughly mixed and then applied to a substrate to form a coating. The composite coating of the present invention has good compatibility and dispersibility between the components, and the composite coating has corrosion resistance and wear resistance, while also having excellent heat resistance, impact resistance, and toughness.

Description

Technical Field

[0001] The invention relates to a wear-resistant and corrosion-resistant nano-ceramic composite coating and a preparation method and application thereof, belonging to the technical field of coatings. Background Art

[0002] Paint is a commonly used chemical material, primarily composed of resins and additives. In industries such as petroleum, chemical, electric power, metallurgy, shipbuilding, and steel, paints are preferred for their wear resistance and corrosion resistance. However, conventional paints still face significant challenges in terms of wear resistance, mechanical properties, and corrosion resistance. Nanoceramics, as inorganic fillers, offer high hardness, excellent wear resistance, and high-temperature resistance. When added to resins to form composite coatings, these composite coatings exhibit superior performance. However, nanoceramics and resins exhibit poor compatibility and dispersibility, which can affect the composite coatings' wear resistance, corrosion resistance, and mechanical strength. Summary of the Invention

[0003] To address at least one problem existing in the above-mentioned prior art, the present invention provides a wear-resistant and corrosion-resistant nano-ceramic composite coating, a preparation method thereof, and an application thereof. The components of the composite coating have good compatibility and dispersibility, and the composite coating has corrosion resistance and wear resistance, as well as excellent heat resistance, impact resistance, and toughness.

[0004] To achieve the above object, the present invention adopts the following technical solution: a wear-resistant and corrosion-resistant nano-ceramic composite coating, comprising a ceramic resin main material and a curing auxiliary material, wherein the weight of the curing auxiliary material is 8.2-9.0% of the weight of the ceramic resin main material;

[0005] The main ingredients of the ceramic resin are calculated by weight and include the following raw materials: 23-27 parts of nano-ceramic powder, 11-14 parts of modified ceramic fiber, 56-63 parts of epoxy resin, 1.8-2.7 parts of organic bentonite, 1.7-2.3 parts of composite leveling agent, and 20-24 parts of composite diluent;

[0006] The curing auxiliary materials include the following raw materials in parts by weight: 7.5-9.5 parts of polyamide curing agent and 1.8-2.2 parts of dicyclohexylmethane diisocyanate.

[0007] Preferably, the modified ceramic fiber is obtained by modifying silicon carbide fiber with a length of 30 to 50 μm by using nanocarbon fiber with a length of 10 to 20 μm and a borate coupling agent.

[0008] Preferably, the preparation process of the modified ceramic fiber is as follows: silicon carbide fiber with a length of 30 to 50 μm, nanocarbon fiber with a length of 10 to 20 μm, and a borate coupling agent are added to toluene in a mass ratio of 10:0.4:0.06, and stirred for reaction for 4 to 5 hours under nitrogen protection and a temperature of 75 to 80°C. After the reaction is completed, the filtrate is filtered and discarded, the filtrate is dispersed in an acetone aqueous solution and then centrifuged. The centrifugal precipitate is washed with water and then dried at a temperature of 85 to 90°C for 8 to 9 hours to obtain the modified ceramic fiber.

[0009] Preferably, the organobentonite is an organobentonite treated with cetyltrimethylammonium bromide or an organobentonite treated with tetradecyltrimethylammonium bromide and cetyltrimethylammonium bromide.

[0010] Preferably, the polyamide curing agent is polyamide 650 or polyamide 651.

[0011] Preferably, the nano-ceramic powder is one of nano-zirconium oxide powder, nano-aluminum oxide powder, nano-silicon dioxide powder, etc., with a particle size of 20 to 80 nm.

[0012] Preferably, the composite leveling agent is composed of phosphate-modified acrylate, polyether-modified organic siloxane, polyether polyester-modified organic siloxane, and N,O-bis(trimethylsilyl)acetamide.

[0013] Preferably, the composite leveling agent is composed of phosphate-modified acrylate, polyether-modified organosiloxane, polyether polyester-modified organosiloxane and N,O-bis(trimethylsilyl)acetamide in a mass ratio of (0.8-1.2):(1.5-2.2):(0.6-1):0.8.

[0014] Preferably, the phosphate-modified acrylate is one of 2-hydroxyethyl methacrylate phosphate and ethylene glycol methacrylate phosphate.

[0015] Preferably, the polyether-modified organosiloxane is one of BYK-378, BYK-335 or BYK-307.

[0016] Preferably, the polyether polyester modified organosiloxane is MONENG-1071 or MONENG-1080.

[0017] Preferably, the diluent consists of butyl glycidyl ether and allyl alcohol glycidyl ether.

[0018] Preferably, the diluent is composed of butyl glycidyl ether and allyl alcohol glycidyl ether in a mass ratio of 1:(1.8~2.5).

[0019] The present invention also provides a method for preparing a wear-resistant and corrosion-resistant nano-ceramic composite coating, comprising the following steps:

[0020] (1) Epoxy resin and composite diluent are stirred and mixed for 15-25 minutes, and then organic bentonite is added and stirred for 20-30 minutes. Then, nano-ceramic powder, modified ceramic fiber and composite leveling agent are added under stirring conditions and stirred for 40-50 minutes to obtain the ceramic resin main material;

[0021] (2) Stirring and mixing the polyamide curing agent and dicyclohexylmethane diisocyanate for 20 to 30 minutes to obtain a curing auxiliary material;

[0022] (3) The ceramic resin main material of step (1) and the curing auxiliary material of step (2) are packaged separately to obtain a wear-resistant and corrosion-resistant nano-ceramic composite coating.

[0023] The present invention provides an application of a wear-resistant and corrosion-resistant nano-ceramic composite coating. The ceramic resin main material and the curing auxiliary material are fully mixed, coated on a substrate using a special tool spraying device, and cured at room temperature or by heating to form a wear-resistant and corrosion-resistant coating.

[0024] Beneficial effects of the present invention: The nano-ceramic composite coating of the present invention uses a ceramic resin main material composed of nano-ceramic powder, modified ceramic fiber, epoxy resin, organic bentonite, composite leveling agent and composite diluent, and a curing auxiliary material composed of a polyamide curing agent and dicyclohexylmethane diisocyanate, so that the components have good compatibility and dispersibility, and effectively improve the corrosion resistance and wear resistance of the composite coating, while also having excellent heat resistance, impact resistance and toughness; the present invention uses modified ceramic fiber and organic bentonite to improve the compatibility and dispersibility of the composite coating, and also allows the modified ceramic fiber and nano-ceramic powder to form a network structure, further improving the anisotropic properties of the composite coating; the present invention uses a phosphate-modified acrylic The composite leveling agent composed of ester, polyether-modified organic siloxane, polyether polyester-modified organic siloxane and N,O-bis(trimethylsilyl)acetamide improves the flow and leveling of the composite coating and also improves the compatibility, which helps to improve the anisotropic performance of the composite coating. The present invention adopts a composite diluent composed of allyl alcohol glycidyl ether and butyl glycidyl ether, which not only enhances the internal bonding force of the composite coating and improves the adhesion strength of the composite coating, but also enhances the stability and impact resistance of the composite coating. The curing auxiliary material of the present invention adopts a polyamide curing agent and dicyclohexylmethane diisocyanate, which can enhance the flexibility and impact resistance of the composite coating while improving the heat resistance, wear resistance and corrosion resistance of the composite coating. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the implementation of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents, instruments, and components is not specified, they are all conventional products that can be purchased commercially.

[0026] Preparation Example 1 Preparation of modified ceramic fibers

[0027] The specific preparation process is as follows: 1 kg of silicon carbide fiber with a length of 30~50 μm, 0.04 kg of nano-carbon fiber with a length of 10~30 μm, and 0.006 kg of borate coupling agent are added to 5.5 kg of toluene, and the reaction is stirred at 150 rpm for 4.5 hours under nitrogen protection and a temperature of 75~80°C. After the reaction is completed, the filtrate is filtered and discarded. The filtrate is dispersed with a 50wt% acetone aqueous solution and centrifuged at 2000 rpm. The centrifugal precipitate is washed with water for 5 minutes and then dried at a temperature of 85~90°C for 8.5 hours to obtain modified ceramic fiber.

[0028] Example 1

[0029] A wear-resistant and corrosion-resistant nano-ceramic composite coating, comprising a ceramic resin main material and a curing auxiliary material, wherein the weight of the curing auxiliary material is 8.2% of the weight of the ceramic resin main material;

[0030] The main ceramic resin material includes the following raw materials in parts by weight: 23 parts of nano-zirconia powder with a particle size of 20-80 nm, 11 parts of modified ceramic fiber prepared in Preparatory Example 1, 56 parts of epoxy resin, 1.8 parts of organic bentonite, 1.7 parts of composite leveling agent, and 20 parts of composite diluent;

[0031] The curing auxiliary materials include the following raw materials in parts by weight: 7.5 parts of polyamide 650 and 1.8 parts of dicyclohexylmethane diisocyanate;

[0032] Wherein, the organic bentonite is organic bentonite treated with hexadecyltrimethylammonium bromide;

[0033] The composite leveling agent is prepared by mixing 2-hydroxyethyl methacrylate phosphate, BYK-378, MONENG-1071 and N,O-bis(trimethylsilyl)acetamide in a mass ratio of 0.8:1.5:0.6:0.8;

[0034] The diluent is composed of butyl glycidyl ether and allyl alcohol glycidyl ether in a mass ratio of 1:1.8;

[0035] The preparation method of the wear-resistant and corrosion-resistant nano-ceramic composite coating comprises the following specific steps:

[0036] (1) 56 parts of epoxy resin and 20 parts of composite diluent were stirred and mixed at 350 rpm for 15 minutes, and then 1.8 parts of organic bentonite were added and stirred and mixed at 350 rpm for 20 minutes. Then, 23 parts of nano-ceramic powder, 11 parts of modified ceramic fiber and 1.7 parts of composite leveling agent were added and stirred at 350 rpm for 40 minutes to obtain the ceramic resin main material;

[0037] (2) 22 parts of polyamide 650 and 6 parts of dicyclohexylmethane diisocyanate were stirred and mixed at 350 rpm for 20 minutes to obtain a curing auxiliary material;

[0038] (3) 110 parts of the ceramic resin main material of step (1) and 9.02 parts of the curing auxiliary material of step (2) are taken and packaged separately to obtain a wear-resistant and corrosion-resistant nano-ceramic composite coating.

[0039] Example 2

[0040] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is the same as that of Example 1, except that the weight of the curing auxiliary material is 8.2% of the weight of the ceramic resin main material;

[0041] The main ceramic resin material includes the following raw materials in parts by weight: 25 parts of nano-zirconia powder with a particle size of 20-80 nm, 13 parts of modified ceramic fiber prepared in Preparation Example 1, 59 parts of epoxy resin, 2.3 parts of organic bentonite, 2 parts of composite leveling agent, and 22 parts of composite diluent;

[0042] The curing auxiliary materials include the following raw materials in parts by weight: 8 parts of polyamide 650 and 2 parts of dicyclohexylmethane diisocyanate;

[0043] The preparation method of this embodiment 2 is partially the same as that of embodiment 1, except that: the wear-resistant and corrosion-resistant nano-ceramic composite coating is prepared by taking 120 parts of the ceramic resin main material and 9.84 parts of the curing auxiliary material and packaging them separately.

[0044] Example 3

[0045] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is the same as that of Example 1, except that the weight of the curing auxiliary material is 8.2% of the weight of the ceramic resin main material;

[0046] The main ceramic resin material includes the following raw materials in parts by weight: 27 parts of nano-zirconia powder with a particle size of 20-80 nm, 14 parts of modified ceramic fiber prepared in Preparation Example 1, 63 parts of epoxy resin, 2.7 parts of organic bentonite, 2.3 parts of composite leveling agent, and 24 parts of composite diluent;

[0047] The curing auxiliary materials include the following raw materials in parts by weight: 9.5 parts of polyamide 650 and 2.2 parts of dicyclohexylmethane diisocyanate;

[0048] The preparation method of this embodiment 3 is partially the same as that of embodiment 1, except that: the wear-resistant and corrosion-resistant nano-ceramic composite coating is prepared by taking 130 parts of the ceramic resin main material and 10.66 parts of the curing auxiliary material and packaging them separately.

[0049] Example 4

[0050] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is the same as that of Example 1, except that the weight of the curing auxiliary material is 8.2% of the weight of the ceramic resin main material;

[0051] The main ceramic resin material includes the following raw materials in parts by weight: 26 parts of nano-zirconia powder with a particle size of 20-80 nm, 12 parts of modified ceramic fiber prepared in Preparation Example 1, 62 parts of epoxy resin, 2 parts of organic bentonite, 2 parts of composite leveling agent, and 23 parts of composite diluent;

[0052] The curing auxiliary materials include the following raw materials in parts by weight: 8.8 parts of polyamide 650 and 2.1 parts of dicyclohexylmethane diisocyanate;

[0053] The preparation method of this embodiment 4 is partially the same as that of embodiment 1, except that: the wear-resistant and corrosion-resistant nano-ceramic composite coating is prepared by taking 125 parts of a ceramic resin main material and 10.25 parts of a curing auxiliary material and packaging them separately.

[0054] Example 5

[0055] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is the same as that of Example 2, except that the weight of the curing auxiliary material is 9.0% of the weight of the ceramic resin main material;

[0056] The rest is the same as Example 2;

[0057] The preparation method of this embodiment 5 is similar to that of embodiment 2, except that: the wear-resistant and corrosion-resistant nano-ceramic composite coating is prepared by separately packaging 110 parts of a ceramic resin main material and 9.9 parts of a curing auxiliary material.

[0058] Example 6

[0059] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw materials and weight parts are the same as those in Example 2, except that the weight of the curing auxiliary material is 9.2% of the weight of the ceramic resin main material;

[0060] The preparation method of Example 6 is the same as that of Example 2, except that: the wear-resistant and corrosion-resistant nano-ceramic composite coating is prepared by taking 105 parts of a ceramic resin main material and 9.66 parts of a curing auxiliary material and packaging them separately.

[0061] Example 7

[0062] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 5, except that: nano-alumina powder replaces nano-zirconia powder;

[0063] The organic bentonite is an organic bentonite treated with 40% of tetradecyltrimethylammonium bromide by mass of the bentonite and 20% of hexadecyltrimethylammonium bromide by mass of the bentonite in a molar ratio of 2:1.

[0064] The composite leveling agent is prepared by mixing 2-hydroxyethyl methacrylate phosphate, BYK-378, MONENG-1071 and N,O-bis(trimethylsilyl)acetamide in a mass ratio of 1:1.85:0.8:0.8;

[0065] The diluent is composed of butyl glycidyl ether and allyl alcohol glycidyl ether in a mass ratio of 1:2.2;

[0066] The preparation method of this embodiment 7 is the same as that of embodiment 5.

[0067] Example 8

[0068] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 5, except that: nano-silicon dioxide powder replaces nano-zirconium oxide powder;

[0069] The organic bentonite is an organic bentonite treated with 40% of tetradecyltrimethylammonium bromide by mass of the bentonite and 20% of hexadecyltrimethylammonium bromide by mass of the bentonite in a molar ratio of 2:1.

[0070] The composite leveling agent is prepared by mixing 2-hydroxyethyl methacrylate phosphate, BYK-378, MONENG-1071 and N,O-bis(trimethylsilyl)acetamide in a mass ratio of 1.2:2.2:1:0.8;

[0071] The diluent is composed of butyl glycidyl ether and allyl alcohol glycidyl ether in a mass ratio of 1:2.5;

[0072] The preparation method of this Example 8 is the same as that of Example 5.

[0073] Example 9

[0074] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition of which is partially the same as that of Example 5, except that the organic bentonite is treated with 40% of tetradecyltrimethylammonium bromide (by mass of the bentonite) and 20% of hexadecyltrimethylammonium bromide (by mass of the bentonite) in a molar ratio of 2:1;

[0075] The composite leveling agent is prepared by mixing ethylene glycol methacrylate phosphate, BYK-307, MONENG-1080 and N,O-bis(trimethylsilyl)acetamide in a mass ratio of 0.8:1.5:0.6:0.8;

[0076] The diluent is composed of butyl glycidyl ether and allyl alcohol glycidyl ether in a mass ratio of 1:2.2;

[0077] The preparation method of this Example 9 is the same as that of Example 5.

[0078] Example 10

[0079] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 5, except that: nano-silicon dioxide powder replaces nano-zirconium oxide powder;

[0080] The composite leveling agent is prepared by mixing ethylene glycol methacrylate phosphate, BYK-335, MONENG-1071 and N,O-bis(trimethylsilyl)acetamide in a mass ratio of 0.8:1.5:0.6:0.8;

[0081] The preparation method of this embodiment 10 is the same as that of embodiment 5.

[0082] Example 11

[0083] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is the same as that of Example 5, except that the weight of the curing auxiliary material is 8.5% of the weight of the ceramic resin main material;

[0084] The organic bentonite is an organic bentonite treated with 40% of tetradecyltrimethylammonium bromide by mass of the bentonite and 20% of hexadecyltrimethylammonium bromide by mass of the bentonite in a molar ratio of 2:1.

[0085] The composite leveling agent is prepared by mixing ethylene glycol methacrylate phosphate, BYK-335, MONENG-1080 and N,O-bis(trimethylsilyl)acetamide in a mass ratio of 1.2:2:0.8:0.8;

[0086] Polyamide 651 replaces polyamide 650;

[0087] The preparation method of this Example 11 is the same as that of Example 5.

[0088] Example 12

[0089] A new wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is the same as that of Example 5, except that the weight of the curing auxiliary material is 8.5% of the weight of the ceramic resin main material;

[0090] Nano-alumina powder replaces nano-zirconia powder;

[0091] The composite leveling agent is prepared by mixing ethylene glycol methacrylate phosphate, BYK-335, MONENG-1080 and N,O-bis(trimethylsilyl)acetamide in a mass ratio of 1.2:2:0.8:0.8;

[0092] Polyamide 651 replaces polyamide 650;

[0093] The preparation method of this Example 12 is the same as that of Example 5.

[0094] Comparative Example 1

[0095] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that: silicon carbide fiber and nano-carbon fiber replace the modified ceramic fiber; 10.5 parts of silicon carbide fiber with a length of 30-50 μm and 0.45 parts of nano-carbon fiber with a length of 10-20 μm;

[0096] The preparation method of this comparative example 1 is the same as that of embodiment 1.

[0097] Comparative Example 2

[0098] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that: modified silicon carbide fiber and nano-carbon fiber replace the modified ceramic fiber; 10.5 parts of modified silicon carbide fiber and 0.45 parts of nano-carbon fiber with a length of 10 to 20 μm;

[0099] Preparation of modified silicon carbide fiber: 1 kg of silicon carbide fiber with a length of 30~50 μm and 0.006 kg of borate coupling agent were added to 5.5 kg of toluene, and the mixture was stirred at 150 rpm under nitrogen protection and a temperature of 75~80 ° C for 4.5 hours. After the reaction, the filtrate was filtered and discarded. The filtrate was dispersed with 50wt% acetone aqueous solution and centrifuged at 2000 rpm. The centrifugal precipitate was washed with water for 5 minutes and then dried at a temperature of 85~90 ° C for 8.5 hours to obtain modified silicon carbide fiber.

[0100] The preparation method of this comparative example 2 is the same as that of example 1.

[0101] Comparative Example 3

[0102] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that modified ceramic powder replaces modified ceramic fiber;

[0103] Preparation of modified ceramic powder: 1 kg of silicon carbide powder with a particle size of 20-80 nm, 0.04 kg of nano-carbon spheres with a particle size of 20-50 nm, and 0.006 kg of borate coupling agent were added to 5.5 kg of toluene, and stirred at 150 rpm for 4.5 hours under nitrogen protection and a temperature of 75-80 ° C. After the reaction, the filtrate was filtered and discarded. The filtrate was dispersed with a 50 wt% acetone aqueous solution and centrifuged at 2000 rpm. The centrifugal precipitate was washed with water for 5 minutes and then dried at a temperature of 85-90 ° C for 8.5 hours to obtain modified silicon carbide fiber.

[0104] The preparation method of this comparative example 3 is the same as that of example 1.

[0105] Comparative Example 4

[0106] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that bentonite replaces organic bentonite;

[0107] The preparation method of this comparative example 4 is the same as that of example 1.

[0108] Comparative Example 5

[0109] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that BYK-378 replaces the composite leveling agent;

[0110] The preparation method of this comparative example 5 is the same as that of example 1.

[0111] Comparative Example 6

[0112] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that MONENG-1071 replaces the composite leveling agent;

[0113] The preparation method of this comparative example 6 is the same as that of example 1.

[0114] Comparative Example 7

[0115] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that: the composite leveling agent is prepared by mixing 2-hydroxyethyl methacrylate phosphate, BYK-378, and MONENG-1071 in a mass ratio of 0.8:1.5:0.6;

[0116] The preparation method of this comparative example 7 is the same as that of example 1.

[0117] Comparative Example 8

[0118] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that: the composite leveling agent is prepared by mixing 2-hydroxyethyl methacrylate phosphate, polydimethylsiloxane, MONENG-1071, and N,O-bis(trimethylsilyl)acetamide in a mass ratio of 0.8:1.5:0.6:0.8;

[0119] The preparation method of this comparative example 8 is the same as that of example 1.

[0120] Comparative Example 9

[0121] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is the same as that of Example 1, except that the composite leveling agent is a mixture of di(2-methylpropyl)phenyl phosphate, BYK-378, MONENG-1071 and N,O-bis(trimethylsilyl)acetamide in a mass ratio of 0.8:1.5:0.6:0.8

[0122] The preparation method of this comparative example 9 is the same as that of example 1.

[0123] Comparative Example 10

[0124] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that butyl glycidyl ether replaces the composite diluent;

[0125] The preparation method of this comparative example 10 is the same as that of example 1.

[0126] Comparative Example 11

[0127] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that: allyl alcohol glycidyl ether replaces the composite diluent;

[0128] The preparation method of this comparative example 11 is the same as that of example 1.

[0129] Comparative Example 12

[0130] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is the same as that of Example 1, except that: ethyl acetate replaces the composite diluent;

[0131] The preparation method of this comparative example 12 is the same as that of Example 1.

[0132] Comparative Example 13

[0133] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is partially the same as that of Example 1, except that: the curing auxiliary material is only polyamide 650;

[0134] The preparation method of this comparative example 13 is the same as that of Example 1.

[0135] Comparative Example 14

[0136] A wear-resistant and corrosion-resistant nano-ceramic composite coating, the raw material composition is the same as that of Example 1, except that: the curing auxiliary materials, calculated by weight, include the following raw materials: 4.65 parts of a polyamide curing agent and 4.65 parts of dicyclohexylmethane diisocyanate;

[0137] The preparation method of this comparative example 14 is the same as that of Example 1.

[0138] Performance test

[0139] Examples 1 to 12 and comparative examples 1 to 14 were tested for performance such as impact resistance, flexibility, adhesion, heat resistance, corrosion resistance, wear resistance, and hardness. The results are shown in Table 1.

[0140] 1. Impact resistance: The impact resistance test is conducted in accordance with the national standard GB / T 1732-2020: The coated test piece is fixed upward on the storage table, a weight is fixed at the required height, the weight is released, and the weight is vertically hit on the test piece. The impact resistance of the coating is evaluated at the maximum height at which no cracks, wrinkles, peeling or other abnormal phenomena such as coating are observed (Kg×cm).

[0141] 2. Flexibility: Bending resistance is measured according to the national standard GB / T 1731-2020: The coated specimen is fixed on the mandrel of the flexibility tester, and the specimen is bent around the mandrel. The flexibility of the coating is evaluated (mm) based on the minimum mandrel diameter at which no pathological phenomena such as peeling, reticulation, and wrinkling of the coating are observed.

[0142] 3. Adhesion: Adhesion is measured in accordance with the national standard GB / T 5210-2006: The coating of the coated specimen is bonded to the test column via an adhesive. The specimen is then placed on a tensile testing machine. A tensile stress is applied perpendicular to the specimen. The maximum tensile stress at which no pathological phenomena such as delamination or cracking of the coating are observed is used to evaluate the adhesion of the coating (MPa).

[0143] 4. Heat resistance: Heat resistance is measured according to the national standard GB / T 1735-2009: Place the coated specimen in a muffle furnace and gradually increase the temperature inside the furnace. The heat resistance of the coating is evaluated at the maximum temperature (°C) at which no abnormal phenomena such as bubbling, cracking, peeling, wrinkling, or discoloration of the coating are observed.

[0144] 5. Wear resistance: Wear resistance is measured according to the national standard GB / T 1768-2006: The wear resistance (mg) of the coated specimen is evaluated by the mass loss under the test conditions of a load of 1500g and a rotation speed of 1000rpm. The smaller the loss, the better the wear resistance.

[0145] 6. Hardness: Hardness is measured according to the national standard GB / T 6739-2006: China brand high-grade drawing pencils are used as pencils, and the hardness of the coating is evaluated at the highest hardness level at which no pathological phenomena such as abrasions, scratches, and indentations are observed.

[0146] 7. Corrosion resistance: 1) Acid resistance: The coated specimens were placed in a 200°C hydrochloric acid, sulfuric acid, and nitric acid vapor environment. The acid resistance of the coating was evaluated by the longest time (hours) during which no abnormal phenomena such as coating peeling, softening, bubbles, cracks, discoloration, or wrinkling were observed. 2) Alkali resistance: The coated specimens were placed in a 25°C 60% sodium hydroxide solution environment and a 200°C ammonia vapor environment. The alkali resistance of the coating was evaluated by the longest time (hours) during which no abnormal phenomena such as coating peeling, softening, bubbles, cracks, discoloration, or wrinkling were observed. 3) Salt resistance: The coated specimens were placed in a 35°C salt spray chamber for a salt spray test using a sodium chloride solution with a pH of 6.5-7.2 and a concentration of 55g / L. The salt resistance of the coating was evaluated by the longest time (hours) during which no abnormal phenomena such as coating peeling, softening, bubbles, cracks, discoloration, or wrinkling were observed.

[0147] Table 1 Performance Effect

[0148]

[0149] As shown in Table 1 above, the components of the nano-ceramic composite coating obtained by using the raw materials and proportions of Examples 1 to 12 of the present invention have good compatibility and dispersibility. The interaction and synergy between the nano-ceramic powder, modified ceramic fiber, epoxy resin, organic bentonite, composite leveling agent, and composite diluent effectively improve the corrosion resistance and wear resistance of the composite coating, while also having excellent heat resistance, impact resistance, and toughness. In addition, the adhesion, corrosion resistance, and wear resistance of the composite coating are further improved under the action of the polyamide curing agent and dicyclohexylmethane diisocyanate.

[0150] Compared with Comparative Examples 1 to 3, Example 1 uses silicon carbide fiber raw materials and modified silicon carbide fibers obtained by co-treatment with nanocarbon fibers and borate coupling agents, which is more conducive to improving the mechanical properties, corrosion resistance and wear resistance of the composite coating; Comparative Example 1 uses silicon carbide fiber and nanocarbon fibers as raw materials added to the composite coating, which has poor dispersibility, is not conducive to the mutual synergy between nanoceramic powder and silicon carbide fiber through nanocarbon fibers, resulting in poor compatibility between nanoceramic powder and silicon carbide fiber and other components of the composite coating, resulting in low tensile stress and poor adhesion, which greatly affects the impact resistance of the coating. and bending resistance, and also greatly reduces the heat resistance, wear resistance and corrosion resistance of the composite coating; the nano-carbon fibers in comparative example 2 do not participate in the modified silicon carbide fibers, which will reduce the synergy between the nano-ceramic powder and the modified silicon carbide fiber coating, thereby affecting the impact resistance, heat resistance, wear resistance and corrosion resistance of the coating; comparative example 3 uses silicon carbide powder to obtain modified silicon carbide powder by treating it with nano-carbon balls and borate coupling agents, which is not conducive to the formation of a network structure between the nano-ceramic powder and the modified silicon carbide powder, thereby affecting the impact resistance and bending strength of the composite coating, and its heat resistance is reduced.

[0151] Compared with Comparative Example 4, Example 1 uses organic bentonite, which can promote its combination with other components of the composite coating, so that the composite coating has good compatibility and dispersibility, thereby improving the adhesion, mechanical properties, wear resistance and heat resistance of the composite coating.

[0152] Compared with Comparative Examples 5 to 9, Example 1 uses a composite leveling agent composed of phosphate-modified acrylate, polyether-modified organosiloxane, polyether polyester-modified organosiloxane and N,O-bis(trimethylsilyl)acetamide. The phosphate-modified acrylate and N,O-bis(trimethylsilyl)acetamide work together to help uniformly disperse the components of the composite coating and improve the dispersion stability, thereby improving the flow and leveling of the composite coating while also improving the compatibility, thereby effectively improving the adhesion and wear resistance of the composite coating; Comparative Example 8 uses polydimethylsiloxane, which reduces the adhesion and mechanical properties of the composite coating; Comparative Example 9 uses di(2-methylpropyl)phenyl phosphate, which greatly reduces the corrosion resistance and heat resistance of the composite coating.

[0153] Compared with Comparative Examples 10 to 12, Example 1 uses a composite diluent composed of allyl alcohol glycidyl ether and butyl glycidyl ether, which enhances the internal bonding force of the composite coating, helps to improve the adhesion strength of the composite coating, and also improves the stability and impact resistance of the composite coating, and improves the mechanical properties; Comparative Example 9 uses ethyl acetate, and the mechanical properties and adhesion are relatively low, and the corrosion resistance and heat resistance are relatively poor.

[0154] Compared with Comparative Examples 13 and 14, Example 1 uses a curing auxiliary material composed of a relatively large amount of polyamide curing agent and a relatively small amount of dicyclohexylmethane diisocyanate, which can improve the flexural strength and impact strength of the composite coating, and to a certain extent, also promote the improvement of the heat resistance, wear resistance and corrosion resistance of the composite coating.

[0155] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0156] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A wear-resistant and corrosion-resistant nano-ceramic composite coating, characterized in that: It includes a ceramic resin main material and a curing auxiliary material, wherein the weight of the curing auxiliary material is 8.2-9.0% of the weight of the ceramic resin main material; The main ingredients of the ceramic resin are calculated by weight and include the following raw materials: 23-27 parts of nano-ceramic powder, 11-14 parts of modified ceramic fiber, 56-63 parts of epoxy resin, 1.8-2.7 parts of organic bentonite, 1.7-2.3 parts of composite leveling agent, and 20-24 parts of composite diluent; The curing auxiliary materials include the following raw materials in parts by weight: 7.5-9.5 parts of polyamide curing agent and 1.8-2.2 parts of dicyclohexylmethane diisocyanate; The modified ceramic fiber preparation process is as follows: silicon carbide fiber with a length of 30 to 50 μm, nanocarbon fiber with a length of 10 to 20 μm, and a borate coupling agent are added to toluene in a mass ratio of 10:0.4:0.06, and stirred under nitrogen protection at a temperature of 75 to 80° C. for 4 to 5 hours. After the reaction is completed, the filtrate is filtered and discarded, the filtrate is dispersed in an acetone aqueous solution and then centrifuged. The centrifugal precipitate is washed with water and then dried at a temperature of 85 to 90° C. for 8 to 9 hours to obtain the modified ceramic fiber; The composite leveling agent consists of phosphate-modified acrylate, polyether-modified organic siloxane, polyether polyester-modified organic siloxane and N,O-bis(trimethylsilyl)acetamide; and the diluent consists of butyl glycidyl ether and allyl alcohol glycidyl ether.

2. The wear-resistant and corrosion-resistant nano-ceramic composite coating according to claim 1, characterized in that: The composite leveling agent is composed of phosphate-modified acrylate, polyether-modified organic siloxane, polyether polyester-modified organic siloxane and N,O-bis(trimethylsilyl)acetamide in a mass ratio of (0.8-1.2):(1.5-2.2):(0.6-1):0.

8.

3. The wear-resistant and corrosion-resistant nano-ceramic composite coating according to claim 1, characterized in that: The diluent is composed of butyl glycidyl ether and allyl alcohol glycidyl ether in a mass ratio of 1:(1.8-2.5).

4. The wear-resistant and corrosion-resistant nano-ceramic composite coating according to claim 1, characterized in that: The phosphate-modified acrylate is one of 2-hydroxyethyl methacrylate phosphate and ethylene glycol methacrylate phosphate; the polyether-modified organosiloxane is one of BYK-378, BYK-335 or BYK-307; and the polyether polyester-modified organosiloxane is MONENG-1071 or MONENG-1080.

5. The wear-resistant and corrosion-resistant nano-ceramic composite coating according to claim 1, characterized in that: The nano-ceramic powder is one of nano-zirconium oxide powder, nano-aluminum oxide powder or nano-silicon dioxide powder, with a particle size of 20 to 80 nm; the organic bentonite is one of organic bentonite treated with hexadecyltrimethylammonium bromide or one of organic bentonite treated with tetradecyltrimethylammonium bromide and hexadecyltrimethylammonium bromide; and the polyamide curing agent is one of polyamide 650 or polyamide 651.

6. A method for preparing the wear-resistant and corrosion-resistant nano-ceramic composite coating according to claim 1, characterized in that: The following steps are involved: (1) Epoxy resin and composite diluent are stirred and mixed for 15-25 minutes, and then organic bentonite is added and stirred for 20-30 minutes. Then, nano-ceramic powder, modified ceramic fiber and composite leveling agent are added under stirring conditions and stirred for 40-50 minutes to obtain the ceramic resin main material; (2) Stirring and mixing the polyamide curing agent and dicyclohexylmethane diisocyanate for 20 to 30 minutes to obtain a curing auxiliary material; (3) The ceramic resin main material of step (1) and the curing auxiliary material of step (2) are packaged separately to obtain a wear-resistant and corrosion-resistant nano-ceramic composite coating.

7. An application of the wear-resistant and corrosion-resistant nano-ceramic composite coating according to claim 1, characterized in that: The ceramic resin main material and the curing auxiliary material are fully mixed and then coated on a substrate to form a coating.

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