An antibacterial antiseptic composition, its preparation method and application

Abstract

The application provides an antibacterial antiseptic composition, a preparation method and application thereof. The antibacterial antiseptic composition comprises a copper / graphene composite material, an epoxy resin, a film forming aid, an organic solvent, a filler and a curing agent, and is an antibacterial antiseptic coating. The antibacterial antiseptic composition has good film forming property and can be cured at room temperature. The paint film formed after curing has strong adhesion, good flexibility, strong impact resistance, good salt spray resistance, good corrosion resistance to 3.5% NaCl solution and good antibacterial property, solves the problem of insufficient protection performance of the existing epoxy heavy-duty anticorrosive coating, and can be applied as the antibacterial antiseptic coating in fields including but not limited to marine ships, coastal infrastructure, petroleum, chemical industry, electric power, automobiles and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of antibacterial and anticorrosive coatings, and particularly relates to an antibacterial and anticorrosive composition, a preparation method and application thereof. BACKGROUND

[0002] At present, microbial corrosion has become an important factor threatening oil and gas development, and is also an important cause of corrosion failure of downhole and surface pipeline. In order to reduce the problem that, in the process of shale gas development, because the surface water of large-scale hydraulic fracturing is not subjected to sufficient sterilization, the fracturing flowback fluid causes serious microbial corrosion to the pipeline system, especially the corrosion perforation phenomenon frequently occurs at the elbow pipe, horizontal pipe, vertical pipe body and weld, and the safety risk in the oil and gas production process increases sharply. The existing epoxy heavy-duty coating often has the defects of high porosity, low hardness, easy to be attacked and damaged by oxygen, water and chloride ions, and the like, and at the same time, is not resistant to bacterial corrosion and has poor wear resistance, so that the protection performance of the coating is obviously insufficient in the corrosion bacterial and erosion working condition environment. Therefore, it is urgent to improve the traditional epoxy coating to enhance the antibacterial property and erosion wear resistance. SUMMARY

[0003] The present application aims to provide an antibacterial and anticorrosive composition to solve the problem that the protection performance of the traditional epoxy coating in the corrosion bacterial and erosion working condition environment is obviously insufficient in the prior art.

[0004] To achieve the above-mentioned purpose, one of the present application provides an antibacterial and anticorrosive composition, which comprises a copper / graphene composite material, an epoxy resin, a film-forming aid, a first organic solvent, a filler and a curing agent.

[0005] In the present application, the copper / graphene composite material is a copper powder particle with a graphene layer grown on the surface; wherein the graphene layer wraps the copper powder particle.

[0006] According to one specific embodiment of the present application, the copper / graphene composite material is a copper / graphene composite material dispersion liquid.

[0007] According to one specific embodiment of the present application, the antibacterial and anticorrosive composition comprises 5 to 10 parts by mass of the copper / graphene composite material dispersion liquid, 20 to 45 parts by mass of the epoxy resin, 5 to 15 parts by mass of the first organic solvent, 2.5 to 6 parts by mass of the film-forming aid, 25 to 55 parts by mass of the filler and 10 to 25 parts by mass of the curing agent;

[0008] Preferably, the antibacterial and anticorrosive composition comprises 10 parts by mass of the copper / graphene composite material dispersion liquid, 20 parts by mass of the epoxy resin, 15 parts by mass of the first organic solvent, 2.8 parts by mass of the film-forming aid, 45 parts by mass of the filler and 10 parts by mass of the curing agent;

[0009] Preferably, the copper / graphene composite dispersion liquid comprises 20 to 30 wt% of the copper / graphene composite and 70 to 80 wt% of the second organic solvent, by mass of 100% of the copper / graphene composite dispersion liquid;

[0010] Preferably, the copper / graphene composite dispersion liquid comprises 23 wt% of the copper / graphene composite and 77 wt% of the second organic solvent, by mass of 100% of the copper / graphene composite dispersion liquid;

[0011] Preferably, the copper / graphene composite dispersion liquid comprises 20 to 30 wt% of the styrene-modified copper / graphene composite and 70 to 80 wt% of the third organic solvent, by mass of 100% of the copper / graphene composite dispersion liquid;

[0012] Preferably, the copper / graphene composite dispersion liquid comprises 23.7 wt% of the styrene-modified copper / graphene composite and 76.3 wt% of the third organic solvent, by mass of 100% of the copper / graphene composite dispersion liquid.

[0013] According to one embodiment of the present application, the epoxy resin is selected from at least one of epoxy resin E20, epoxy resin E21, epoxy resin E44, and epoxy resin E51.

[0014] According to one embodiment of the present application, the first organic solvent, the second organic solvent, and the third organic solvent independently comprise at least one of xylene, n-butanol, and cyclohexanone;

[0015] Preferably, the first organic solvent is a mixture of xylene and n-butanol; and / or

[0016] The second organic solvent and the third organic solvent are independently xylene.

[0017] According to one embodiment of the present application, the film-forming aid comprises at least one of a dispersant (e.g., dispersant AFCONA-4010), a defoaming agent (e.g., defoaming agent BKY333), and a leveling agent (e.g., leveling agent BYK333).

[0018] According to one embodiment of the present application, the filler comprises at least one of mica, calcium carbonate, and glass powder;

[0019] Preferably, the filler is a mixture of mica and glass powder;

[0020] Preferably, the particle size of the filler is 10 to 40 μm.

[0021] According to an embodiment of the present application, the curing agent comprises at least one of a polyamide, an aromatic amine and an alicyclic amine.

[0022] Preferably, the curing agent is curing agent polyamide 651.

[0023] The second aspect of the present application provides a method for preparing the antibacterial antiseptic composition according to the first aspect of the present application, comprising the following steps:

[0024] A. Pre-treating the copper / graphene composite material, and then mixing the copper / graphene composite material with the first organic solvent, the epoxy resin, the film-forming aid and the filler, and grinding to obtain a mixed slurry;

[0025] B. Mixing the mixed slurry with the curing agent to obtain the antibacterial antiseptic composition.

[0026] According to an embodiment of the present application, in step A, the pre-treatment is dispersing the copper / graphene composite material in the second organic solvent to obtain a copper / graphene composite material dispersion liquid.

[0027] Preferably, the pre-treatment is dispersing the copper / graphene composite material and styrene in the third organic solvent, and reacting to obtain the copper / graphene composite material dispersion liquid.

[0028] According to an embodiment of the present application, the mass ratio of the styrene to the copper / graphene composite material is 1:30; and / or

[0029] The reaction is performed at room temperature; and / or

[0030] The reaction is a modification of the copper / graphene composite material by styrene.

[0031] According to an embodiment of the present application, the temperature of the mixing in step A is 15-60°C; and / or

[0032] The fineness of the mixed slurry is 10-50 μm.

[0033] According to an embodiment of the present application, the copper / graphene composite material is prepared by the following method:

[0034] 1) Mixing copper powder and carbon powder, and grinding to obtain a mixed powder;

[0035] 2) Placing the mixed powder in a fluidized state, and introducing gaseous hydrocarbon, and reacting to obtain the copper / graphene composite material.

[0036] The fluidized state according to the present application refers to a solid fluidized state, i.e. solid particles (e.g. copper powder and carbon powder) are suspended in a moving fluid (e.g. inert gas) so that the solid particles are in a fluid-solid contact state with some characteristics of the fluid.

[0037] According to one embodiment of the present application, the mass ratio of the copper powder to the carbon powder in the mixed powder is 1:(0.25 to 4);

[0038] Preferably, the mass of the mixed powder is 100 to 400 g.

[0039] According to one embodiment of the present application, the particle size of the copper powder and the particle size of the carbon powder are independently 100 to 500 μm; and / or

[0040] The particle size of the mixed powder is 100 to 300 μm.

[0041] According to one embodiment of the present application, in step 1), the grinding is performed under vacuum; and / or

[0042] First, the mixed powder is heated after being placed in a quartz tube and being vacuumed, and then the step 2) is performed; and / or

[0043] In step 2), the mixed powder is in a fluidized state by introducing inert gas; and / or

[0044] In step 2), the reaction product obtained in the reaction is cooled to room temperature (25°C) to obtain the copper / graphene composite material.

[0045] According to one embodiment of the present application, the vacuum degree of the quartz tube is 1 x 10 -1 to 5 x 10 -1 Pa; and / or the temperature in the quartz tube after heating is 700 to 900°C;

[0046] Preferably, the flow rate of the inert gas is 500 to 2000 mL / min; and / or

[0047] The flow rate of the gaseous hydrocarbon is 200 to 500 mL / min; and / or

[0048] The duration of the reaction is 30 to 150 min;

[0049] Preferably, the quartz tube is a vertical quartz tube; and / or the inert gas comprises argon and / or helium; and / or

[0050] In step 1), the grinding is performed by vacuum ball milling;

[0051] Preferably, the vacuum degree of the vacuum ball milling is 1 x 10-3 to 3x10 -3 Pa; and / or the rotation speed is 100 to 300 rpm;

[0052] and / or the time length is 20 to 50 min;

[0053] Preferably, the gaseous hydrocarbon is at least one of C1 to C4 alkanes, alkenes and alkynes.

[0054] Preferably, the gaseous hydrocarbon is ethylene.

[0055] The application of the antibacterial and antiseptic composition according to the antibacterial and antiseptic composition of the present application or the method of the present application in antibacterial and antiseptic.

[0056] The beneficial effects of the present application are:

[0057] In view of the problem that the existing epoxy heavy-duty anticorrosive coating has poor protection performance in the environment containing corrosion bacteria and erosion, the present application provides an antibacterial and antiseptic composition, a preparation method and application thereof. The antibacterial and antiseptic composition comprises a copper / graphene composite material, an epoxy resin, a film-forming aid, a first organic solvent, a filler and a curing agent, and is an antibacterial and antiseptic coating. The antibacterial and antiseptic composition provided by the present application has good film-forming property (the paint film formed after curing of the antibacterial and antiseptic composition has a smooth appearance without particles or grooves), can be cured at room temperature, has strong adhesion of the paint film formed after curing (the adhesion can reach 0 level, the edge of the cut is very smooth, and none of the squares in the grid peels off), good flexibility (no cracking or peeling is observed when a shaft with a minimum diameter of 2 mm is used for testing), strong impact resistance (no cracks, wrinkles and peeling are observed in three experiments, and the maximum height of the peeling phenomenon is 40 to 50 cm), good salt spray resistance (the salt spray resistance can reach 1200 h, and no blistering, rusting and rust corrosion spreading from the scratch are observed), good corrosion resistance to 3.5% NaCl solution (no loss of luster, discoloration, rusting, blistering, peeling and cracking are observed within 1000 h), good antibacterial property (the antibacterial property can reach level 1, the antibacterial performance is not less than 99%, and the antibacterial durability is not less than 95%), solves the problem of poor protection performance of the existing epoxy heavy-duty anticorrosive coating, and the preparation method is simple. The antibacterial and antiseptic coating can be applied in fields including but not limited to marine vessels, coastal infrastructure, petroleum, chemical industry, power, automobiles and the like, and in particular, can be applied in antibacterial and antiseptic of oil and gas field ground gathering pipelines and petrochemical equipment substrates. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 Surface electron scanning microscope photos of the paint film formed by the antibacterial and antiseptic composition prepared in Example 3;

[0059] Figure 2 Surface electron scanning microscope photos of the paint film formed by the antibacterial and antiseptic composition prepared in Example 2;

[0060] Figure 3 Corrosion photograph of the paint film formed by the antibacterial antiseptic composition prepared in Example 3 after salt spray test for 1200h;

[0061] Figure 4 Nyquist plot of the paint film formed by the antibacterial antiseptic composition prepared in Example 3 in 3.5% NaCl solution within 50 days of immersion, wherein the thickness of the paint film is 90 μm. DETAILED DESCRIPTION

[0062] The application will be further described in conjunction with the examples below, but the examples of the application are only exemplary description, and the implementation manner does not constitute a limitation to the application in any case.

[0063] The room temperature below refers to 25℃.

[0064] Preparation of copper / graphene composite material

[0065] Example 1

[0066] 1) 100g of copper powder with a particle size of 200μm and 150g of carbon powder with a particle size of 300μm were put into a container for stirring and mixing, and then put into a planetary vacuum ball mill for vacuum ball milling treatment, and the vacuum degree of the ball milling was 1.5×10 -3 Pa, the rotation speed was 200rpm, the ball milling time was 35min, and then a mixed powder with an average particle size of 150μm was obtained;

[0067] 2) 300g of the mixed powder prepared according to the method in step 1) was put into a vertical quartz tube close to the air inlet end, and vacuumized to 1×10 -1 Pa, and then the heating program was started, and when heated to 800℃, the protective gas argon was introduced into the mixed powder at a flow rate of 1500mL / min until the mixed powder was in a fluidized state, and then ethylene was introduced at a flow rate of 330mL / min for graphene growth, and the reaction time was 120min, and after the reaction was completed, the gas was closed first, and then cooled to room temperature, and thus the copper / graphene composite material was obtained.

[0068] Preparation of antibacterial antiseptic composition

[0069] Example 2

[0070] A. Copper / graphene composite material pretreatment: 15g of the copper / graphene composite material prepared in Example 1 was weighed and added into 50g of dimethylbenzene for ultrasonic dispersion at room temperature, the ultrasonic time was 2h, and the ultrasonic power was 600W, and thus a copper / graphene composite material dispersion liquid was obtained;

[0071] Preparation of mixed slurry: take 10 g of copper / graphene composite dispersion liquid, add 20 g of epoxy resin E21, 10 g of dimethylbenzene, 5 g of n-butanol, 30 g of mica powder with an average particle size of 30 μm, 15 g of glass powder with an average particle size of 30 μm, 0.5 g of leveling agent BYK333, 0.8 g of defoaming agent BKY333, and 1.5 g of dispersant AFCONA-4010, stir at a speed of 2000 r / min for 30 min at room temperature with a stirrer, and obtain a mixed slurry;

[0072] B. The obtained mixed slurry is ground in a grinder for 2 h to a fineness of 50 μm, 10 g of curing agent polyamide 651 is added, and the mixture is stirred and mixed uniformly to obtain an antibacterial and anticorrosive composition.

[0073] Example 3

[0074] A. Copper / graphene composite pretreatment: at room temperature, 15 g of copper / graphene composite prepared in Example 1 and 0.5 g of styrene are added to 50 g of dimethylbenzene for ultrasonic dispersion, the ultrasonic time is 2 h, and the ultrasonic wave power is 600 W. During the ultrasonic dispersion process, the styrene and the copper / graphene composite react, the modification of the styrene on the copper / graphene composite is completed, and a copper / graphene composite dispersion liquid is obtained;

[0075] Preparation of mixed slurry: take 10 g of copper / graphene composite dispersion liquid, add 20 g of epoxy resin E20, 10 g of dimethylbenzene, 5 g of n-butanol, 30 g of mica powder with an average particle size of 30 μm, 15 g of glass powder with an average particle size of 30 μm, 0.5 g of leveling agent BYK333, 0.8 g of defoaming agent BKY333, and 1.5 g of dispersant AFCONA-4010, stir at a speed of 2000 r / min for 30 min at room temperature with a stirrer, and obtain a mixed slurry;

[0076] B. The obtained mixed slurry is ground in a grinder for 2 h to a fineness of 50 μm, 10 g of curing agent polyamide 651 is added, and the mixture is stirred and mixed uniformly to obtain an antibacterial and anticorrosive composition.

[0077] Example 4

[0078] A. Copper / graphene composite pretreatment: at room temperature, 15 g of copper / graphene composite prepared in Example 1 and 0.5 g of styrene are added to 50 g of dimethylbenzene for ultrasonic dispersion, the ultrasonic time is 2 h, and the ultrasonic wave power is 600 W. During the ultrasonic dispersion process, the styrene and the copper / graphene composite react, the modification of the styrene on the copper / graphene composite is completed, and a copper / graphene composite dispersion liquid is obtained;

[0079] Preparation of mixed slurry: take 10 g of copper / graphene composite dispersion liquid, add 20 g of epoxy resin E44, 10 g of dimethylbenzene, 5 g of n-butanol, 30 g of mica powder with an average particle size of 10 μm, 15 g of glass powder with an average particle size of 40 μm, 0.5 g of leveling agent BYK333, 0.8 g of defoaming agent BKY333 and 1.5 g of dispersant AFCONA-4010, and stir at a speed of 2000 r / min for 30 min at 15 ℃ by using a stirrer to obtain a mixed slurry;

[0080] B. The obtained mixed slurry is ground in a grinder for 12 h to a fineness of 10 μm, 5 g of curing agent polyamide 651 and 5 g of alicyclic amine are added, and the mixture is stirred and mixed uniformly to obtain an antibacterial and anticorrosive composition.

[0081] Example 5

[0082] A. Copper / graphene composite pretreatment: at room temperature, 15 g of copper / graphene composite prepared in Example 1 and 0.5 g of styrene are added to 50 g of dimethylbenzene for ultrasonic dispersion, the ultrasonic time is 2 h, and the ultrasonic power is 600 W. During the ultrasonic dispersion process, the styrene and the copper / graphene composite react, the modification of the copper / graphene composite by the styrene is completed, and a copper / graphene composite dispersion liquid is obtained;

[0083] Preparation of mixed slurry: take 10 g of copper / graphene composite dispersion liquid, add 20 g of epoxy resin E51, 10 g of dimethylbenzene, 5 g of n-butanol, 15 g of mica powder with an average particle size of 40 μm, 30 g of glass powder with an average particle size of 10 μm, 0.5 g of leveling agent BYK333, 0.8 g of defoaming agent BKY333 and 1.5 g of dispersant AFCONA-4010, and stir at a speed of 2000 r / min for 30 min at 60 ℃ by using a stirrer to obtain a mixed slurry;

[0084] B. The obtained mixed slurry is ground in a grinder for 8 h to a fineness of 30 μm, 10 g of curing agent polyamide 651 is added, and the mixture is stirred and mixed uniformly to obtain an antibacterial and anticorrosive composition.

[0085] Comparative Example 1

[0086] A. Preparation of mixed slurry: take 20 g of epoxy resin E20, 10 g of dimethylbenzene, 5 g of n-butanol, 40 g of mica powder with an average particle size of 30 μm, 15 g of glass powder with an average particle size of 30 μm, 0.5 g of leveling agent BYK333, 0.8 g of defoaming agent BKY333 and 1.5 g of dispersant AFCONA-4010, and stir at a speed of 2000 r / min for 30 min at room temperature by using a stirrer to obtain a mixed slurry;

[0087] B. The obtained mixed slurry was ground in a grinder for 2h to a fineness of 50μm, 10g of curing agent polyamide 651 was added, and the mixture was stirred and mixed uniformly to obtain the antibacterial and anticorrosive composition.

[0088] Test Example 1

[0089] The appearance, adhesion, flexibility, impact resistance, salt spray resistance, 3.5% NaCl solution corrosion resistance, and antibacterial properties of the paint film obtained after the antibacterial and anticorrosive composition prepared in Examples 2 to 5 and Comparative Example 1 was formed were determined, and the performance of the antibacterial and anticorrosive composition as an antibacterial and anticorrosive paint was evaluated.

[0090] The specific method is as follows:

[0091] i. Preparation of paint film

[0092] The steel substrate was sandblasted to remove oxides, adsorbates and other impurities on the surface, and then the antibacterial and anticorrosive composition prepared in any one of Examples 2 to 5 and Comparative Example 1 was sprayed on the treated steel substrate, and naturally dried for 24h to form a paint film with an average thickness of 90μm on the steel substrate;

[0093] According to the above method, the paint film was prepared using the antibacterial and anticorrosive composition prepared in Examples 2 to 5 and Comparative Example 1, respectively, for standby.

[0094] ii. Appearance of paint film

[0095] 1) The appearance of the paint film prepared from the antibacterial and anticorrosive composition prepared in Examples 2 to 5 and Comparative Example 1 was observed by visual observation method, and the specific results are shown in Table 1;

[0096] 2) The surface morphology of the paint film prepared from the antibacterial and anticorrosive composition prepared in Example 3 and Example 2 was observed by scanning electron microscopy, and the specific results are shown in Figure 1 , Figure 2 .

[0097] iii. Adhesion of paint film

[0098] The adhesion grade of the paint film formed by the antibacterial and anticorrosive composition on the steel substrate was determined according to the method specified in the international standard ISO 2409, and the specific results are shown in Table 1.

[0099] iv. Flexibility of paint film

[0100] The flexibility of the paint film formed by the antibacterial and anticorrosive composition on the steel substrate was determined according to the method specified in the national standard GB / T 6742, and the specific results are shown in Table 1.

[0101] v. Impact resistance of paint film

[0102] The impact resistance of the paint film formed by the antibacterial and anti-corrosion composition on the steel substrate was determined according to the method specified in the national standard GB / T 1732. The specific results are shown in Table 1.

[0103] ⅵ Salt spray resistance

[0104] The salt spray resistance of the coating film formed by the antibacterial and anti-corrosion composition on a steel substrate was determined according to the method specified in national standard GB / T 1771. Specific results are shown in [link to results]. Figure 3 Table 1.

[0105] ⅶ Resistance to corrosion from 3.5% NaCl solution

[0106] The corrosion resistance of the paint film formed by the antibacterial and anti-corrosion composition on a steel substrate to 3.5% NaCl solution was determined according to the method specified in national standard GB / T 10834. Specific results are shown in [link to results]. Figure 4 Table 1.

[0107] ⅷ Antibacterial properties

[0108] The antibacterial properties of the paint film formed on steel substrate by the antibacterial and anti-corrosion composition were determined according to the method specified in national standard GB / T 21866. The specific results are shown in Table 1.

[0109] Table 1. Properties of the coating film formed by the antibacterial and antiseptic compositions

[0110] Coat film properties Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Appearance Smooth Smooth Smooth Smooth Smooth Adhesion Class 1 Class 0 Class 1 Class 0 Class 1 Flexibility 2 mm 2 mm 2 mm 2 mm 2 mm Impact resistance 40 cm 50 cm 50 cm 40 cm 40 cm Salt spray resistance (h) 650 1200 1100 1100 600 Resistance to 3.5% NaCl solution (h) 700 1000 950 900 700 Antibacterial property Class 2 Class 1 Class 1 Class 1 Not antibacterial

[0111] Combination Figures 1 to 4 The data in Table 1 were analyzed to assess the appearance, adhesion, flexibility, impact resistance, salt spray resistance, resistance to 3.5% NaCl solution corrosion, and antibacterial properties of the coating film. (1) Appearance: Table 1 shows that the coating films formed by the antibacterial and anti-corrosion compositions prepared in Examples 2 to 5 all had a smooth appearance, and Figure 1 and Figure 2It is also shown that the paint film surface formed by the antibacterial antiseptic composition prepared in Example 3 and Example 2 has good flatness under scanning electron microscope, indicating that the antibacterial antiseptic composition prepared in Examples 2 to 5 has good film forming property.(2) Adhesion: the paint film formed by the antibacterial antiseptic composition prepared in Examples 2 to 5 has adhesion of 0 to 1 grade, and the paint film formed by the antibacterial antiseptic composition prepared in Example 3 and Example 5 has adhesion of 0 grade (i.e. the edge of the cut is very smooth, and none of the squares in the grid is peeled off), indicating that the paint film formed by the antibacterial antiseptic composition prepared in Examples 2 to 5 has good adhesion and is not easy to fall off from the substrate.(3) Flexibility: the paint film formed by the antibacterial antiseptic composition prepared in Examples 2 to 5 has good flexibility, and no cracking or peeling is observed when the shaft with the minimum diameter (i.e. 2 mm) is used for testing.(4) Impact resistance: no crack, wrinkle or peeling phenomenon is observed in the three experiments of the paint film formed by the antibacterial antiseptic composition prepared in Examples 2 to 5, and the maximum height is 40 to 50 cm, wherein the maximum height is 50 cm in the three experiments of the paint film formed by the antibacterial antiseptic composition prepared in Example 3 and Example 4, and the impact resistance is strong.(5) Salt spray resistance: the paint film formed by the antibacterial antiseptic composition prepared in Examples 2 to 5 has salt spray resistance of 650 to 1200 h, and no blistering, rusting and rust spreading from the scratch are observed, indicating that the salt spray resistance is good; Figure 3 The photograph of the paint film formed by the antibacterial antiseptic composition prepared in Example 3 after the salt spray resistance test for 1200 h shows that no blistering is observed on the surface of the paint film, no corrosion is observed in the area outside the cross-shaped scratch, and no rust spreading from the scratch to the surrounding area is observed, indicating that the salt spray resistance is good. Compared with Example 3, the paint film formed by the antibacterial antiseptic composition prepared in Comparative Example 1 has salt spray resistance of 600 h, which is 600 h shorter than that of Example 3, and the salt spray resistance is obviously decreased.(6) Corrosion resistance to 3.5% NaCl solution: the paint film formed by the antibacterial antiseptic composition prepared in Examples 2 to 5 has corrosion resistance to 3.5% NaCl solution for 700 to 1000 h, and no discoloration, rusting, blistering, peeling and cracking are observed within 700 to 1000 h, indicating that the corrosion resistance to 3.5% NaCl solution is good; Figure 4The change curve of the AC impedance spectrum of the paint film with a thickness of 90 μm formed by the antibacterial preservative composition prepared in Example 3 within 50 days of immersion in a 3.5% NaCl solution shows that the impedance modulus value of the paint film slowly decreases with the extension of the immersion time, and the radius of the capacitive arc gradually decreases, indicating that the stability and the corrosion resistance to the 3.5% NaCl solution of the paint film formed by the antibacterial preservative composition prepared in Example 3 are better. Compared with Example 3, the corrosion resistance to the 3.5% NaCl solution of the paint film formed by the antibacterial preservative composition prepared in Comparative Example 1 is 700 h, which is 300 h shorter than that of Example 3, and the corrosion resistance to the 3.5% NaCl solution is greatly decreased.(7) Antibacterial property: the antibacterial property of the paint film formed by the antibacterial preservative composition prepared in Examples 3 to 5 reaches level 1, the antibacterial performance is not lower than 99%, and the antibacterial durability is not lower than 95%, which is suitable for places with high antibacterial performance requirements; the antibacterial property of the paint film formed by the antibacterial preservative composition prepared in Example 2 reaches level 2, the antibacterial performance is not lower than 90%, and the antibacterial durability is not lower than 85%, which is suitable for places with antibacterial performance requirements; compared with Example 3, the paint film formed by the antibacterial preservative composition prepared in Comparative Example 1 has no antibacterial property and cannot be used in places with antibacterial performance requirements.

[0112] From the formula, compared with Example 3, Comparative Example 1 replaces the 10 g copper / graphene composite material dispersion liquid with equal mass of mica powder, which shows that the adhesion and impact resistance of the paint film formed by the antibacterial preservative composition prepared in Comparative Example 1 are slightly lower than those of Example 3, the salt spray resistance and the corrosion resistance to the 3.5% HCl solution are much lower than those of Example 3, and the antibacterial preservative composition prepared in Comparative Example 1 has no antibacterial property and cannot be applied to places with antibacterial performance requirements, which limits the application range thereof.

[0113] Although the present application has been described with reference to specific embodiments, it is understood by those skilled in the art that various changes can be made without departing from the true spirit and scope of the present application. In addition, various changes can be made to the subject matter, spirit and scope of the present application to adapt to specific situations, materials, material compositions and methods. All these changes are included in the scope of the claims of the present application.

Claims

1. An antibacterial and antiseptic composition comprising a copper / graphene composite dispersion, an epoxy resin, a film-forming aid, a first organic solvent, a filler, and a curing agent; The copper / graphene composite material dispersion is obtained by reacting copper / graphene composite material and styrene in a third organic solvent. The copper / graphene composite material was prepared by the following method: 1) Mix copper powder and carbon powder and grind them to obtain a mixed powder; 2) The mixed powder is placed in a fluidized state, and gaseous hydrocarbons are introduced to react and obtain the copper / graphene composite material; The gaseous hydrocarbon is at least one of C1 to C4 alkanes, alkenes, and alkynes.

2. The antibacterial and preservative composition according to claim 1, characterized in that, The antibacterial and preservative composition comprises, by weight, 5 to 10 parts of the copper / graphene composite dispersion, 20 to 45 parts of the epoxy resin, 5 to 15 parts of the first organic solvent, 2.5 to 6 parts of the film-forming aid, 25 to 55 parts of the filler, and 10 to 25 parts of the curing agent.

3. The antibacterial and preservative composition according to claim 1, characterized in that, The copper / graphene composite material dispersion is 100% by mass, and the copper / graphene composite material dispersion comprises 20 to 30 wt% of the styrene-modified copper / graphene composite material and 70 to 80 wt% of a third organic solvent.

4. The antibacterial and preservative composition according to claim 1, characterized in that, The epoxy resin is selected from at least one of epoxy resin E20, epoxy resin E21, epoxy resin E44 and epoxy resin E51.

5. The antibacterial and preservative composition according to claim 1, characterized in that, The first organic solvent and the third organic solvent independently include at least one of xylene, n-butanol and cyclohexanone.

6. The antibacterial and preservative composition according to claim 1, characterized in that, The film-forming aid includes at least one of a dispersant, a defoamer, and a leveling agent.

7. The antibacterial and preservative composition according to claim 1, characterized in that, The filler includes at least one of mica, calcium carbonate, and glass powder.

8. The antibacterial and preservative composition according to claim 1, characterized in that, The curing agent includes at least one of polyamide, aromatic amine and alicyclic amine.

9. A method for preparing an antibacterial and preservative composition according to any one of claims 1 to 8, comprising the following steps: A. Disperse the copper / graphene composite material and styrene in the third organic solvent, react to obtain the copper / graphene composite material dispersion, then mix the copper / graphene composite material dispersion with the first organic solvent, epoxy resin, film-forming aid and filler, grind to obtain a mixed slurry; B. Mix the mixed slurry and the curing agent to obtain the antibacterial and antiseptic composition.

10. The method according to claim 9, characterized in that, The mass ratio of the styrene to the copper / graphene composite material is 1:30; The reaction is carried out at room temperature.

11. The method according to claim 9 or 10, characterized in that, The mixing temperature in step A is 15 to 60°C; The fineness of the mixed slurry is 10 to 50 μm.

12. The use of any one of the antimicrobial and preservative compositions according to any one of claims 1 to 8 or the antimicrobial and preservative compositions prepared by any one of claims 9 to 11 in antimicrobial and preservative applications.

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