Negative oxygen ion antibacterial and antiviral aquaculture pond coating and preparation process thereof

Abstract

The invention discloses a negative oxygen ion antibacterial and antiviral aquaculture pond coating and a preparation process thereof, and relates to the technical field of coatings. The polyurethane coating with excellent antibacterial performance is prepared by taking the polyurethane emulsion as main resin of the coating, adding inorganic fillers such as the negative oxygen ion powder, the silicon dioxide powder and the titanium dioxide and then adding coating auxiliaries such as the dispersing agent, the defoaming agent, the coalescing agent and the thickening agent, and the polyurethane coating can be used for coating the surface of an aquaculture pond and has good antibacterial performance. The antibacterial and antiviral effects can be well achieved, the negative oxygen ion powder is introduced in the scheme, negative oxygen ions can be released, and the air quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a negative oxygen ion antibacterial and antiviral aquaculture pond coating and a preparation process thereof. Background Art

[0002] An aquaculture pond is a place where aquatic plants and animals are bred, cultivated and harvested under human control. Aquaculture generally includes the whole process of growing aquatic products from seedlings under artificial feeding and management. Existing aquaculture ponds on the market are generally built with cement, polyethylene, fiberglass, alloy steel plates and other materials. Each material has its unique advantages and limitations and is suitable for different breeding needs and environmental conditions.

[0003] In order to further improve the pond farming effect and improve the antibacterial and antiviral properties of aquaculture ponds, functional coatings are generally coated or sprayed on the pool wall to give it excellent antibacterial properties, release negative oxygen ions and other limited functions. The present application discloses a negative oxygen ion antibacterial and antiviral aquaculture pond coating and its preparation process to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a negative oxygen ion antibacterial and antiviral aquaculture pond coating and a preparation process thereof to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating comprises the following steps: Step 1: Mix dimethylaminoethyl methacrylate quaternary ammonium salt and 1,6-hexanedithiol, add castor oil and photoinitiator, stir evenly and place under ultraviolet light for 60-80 minutes. After the reaction is completed, collect the product and purify it to obtain antibacterial castor oil monomer; Step 2: Mix the antibacterial castor oil monomer and 1-thioglycerol, add a photoinitiator, stir evenly, and then irradiate under a UV lamp to react for 50 to 60 minutes. After the reaction is completed, dilute with ethyl acetate, purify, and obtain a polyhydroxy antibacterial castor oil monomer; Step 3: Mix castor oil and polyhydroxy antibacterial castor oil monomer, heat to 75-80°C, add isophorone diisocyanate and dibutyltin dilaurate after stirring evenly, keep warm for 3-4 hours, then add dihydroxy-terminated polydimethylsiloxane and 2,2-dihydroxymethylpropionic acid, continue to react for 2-3 hours, use butanone to reduce viscosity, cool to 40-45°C, add triethylamine for neutralization for 20-30 minutes, emulsify and disperse with deionized water to obtain a polyurethane emulsion; Step 4: Mix the negative oxygen ion powder, silica powder, titanium dioxide and 1 / 2 mass part of deionized water, stir evenly, then add dispersant, defoaming agent, film-forming aid and thickener, then add polyurethane emulsion and 1 / 2 mass part of deionized water, stir evenly to obtain the aquaculture pond paint.

[0006] In a more optimized solution, in step 4, the specific amounts of each component used, by mass, are: 4 to 6 parts of negative oxygen ion powder, 1 to 1.5 parts of silica powder, 20 to 25 parts of titanium dioxide, 0.3 to 0.5 parts of dispersant, 0.3 to 0.5 parts of defoaming agent, 0.5 to 1 parts of film-forming aid, 0.3 to 0.5 parts of thickener, 35 to 40 parts of polyurethane emulsion, and 20 to 25 parts of deionized water.

[0007] In a more optimized scheme, in step 3, the amounts of each component used, in parts by mass, are: 30 to 35 parts of castor oil, 8 to 10 parts of polyhydroxy antibacterial castor oil monomer, 35 to 40 parts of isophorone diisocyanate, 8 to 10 parts of dihydroxy-terminated polydimethylsiloxane, and 6 to 8 parts of 2,2-dihydroxymethylpropionic acid; the amount of dibutyltin dilaurate used is 0.1 to 0.15 wt% of the total mass of castor oil and isophorone diisocyanate.

[0008] In a more optimized solution, in step 2, the molar ratio of the C=C of the antibacterial castor oil monomer to the thiol of 1-thioglycerol is 1:(1.5-2).

[0009] According to a more optimized scheme, in step 1, the molar ratio of dimethylaminoethyl methacrylate quaternary ammonium salt, 1,6-hexanedithiol, and castor oil is (2-2.5): (2-2.2): 1.

[0010] In a more optimized solution, in step 1 and step 2, the photoinitiator is photoinitiator 1173, and the amount of the photoinitiator used is 2-2.5 wt % of the total mass of the reaction system.

[0011] The more optimized scheme is to prepare the dimethylaminoethyl methacrylate quaternary ammonium salt by mixing dimethylaminoethyl methacrylate, acetonitrile and an inhibitor, heating to 45-50°C, slowly dropping bromoalkane, keeping the temperature for 10-12 hours, cooling to room temperature after the reaction is completed, washing with ether to precipitate a solid precipitate, filtering, and vacuum drying to obtain dimethylaminoethyl methacrylate quaternary ammonium salt.

[0012] In a more optimized solution, the polymerization inhibitor is hydroquinone, and the molar ratio of the polymerization inhibitor to dimethylaminoethyl methacrylate is 1:(13-14); the molar ratio of dimethylaminoethyl methacrylate to brominated alkane is (1-1.1):1.

[0013] In a more optimized solution, the brominated alkane is brominated tetradecane or brominated hexadecane, and the solid content of the polyurethane emulsion is 30-40%.

[0014] A more optimized solution is a negative oxygen ion antibacterial and antiviral aquaculture pond coating prepared according to any of the preparation processes described above.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: The invention discloses a negative oxygen ion antibacterial and antiviral aquaculture pond coating and a preparation process thereof. The scheme uses polyurethane emulsion as the main resin of the coating, adds negative oxygen ion powder, silicon dioxide powder, titanium dioxide and other inorganic fillers, and then adds dispersants, defoamers, film-forming aids, thickeners and other coating additives to prepare a polyurethane coating with excellent antibacterial properties. The polyurethane coating can be used for surface coating of aquaculture ponds, can better achieve the antibacterial and antiviral effects, and the scheme introduces negative oxygen ion powder, which can release negative oxygen ions and improve air quality.

[0016] In the present scheme, the present application first uses castor oil as the polyol in the polyurethane reaction system, and first utilizes dimethylaminoethyl methacrylate and bromoalkane to react to generate dimethylaminoethyl methacrylate quaternary ammonium salt, which has excellent antibacterial properties and has a strong bactericidal effect on Escherichia coli, Staphylococcus aureus, etc. Therefore, dimethylaminoethyl methacrylate quaternary ammonium salt is mixed with castor oil, and a thiol-ene click reaction is carried out under the action of a photoinitiator, thereby introducing an antibacterial monomer into the castor oil; then the scheme utilizes C=C in the antibacterial castor oil monomer to click-react with 1-thioglycerol to obtain a polyhydroxy antibacterial castor oil monomer, thereby increasing the hydroxyl content of castor oil and further improving the crosslinking density of the polyurethane coating.

[0017] On this basis, the scheme uses castor oil as the polyol, adds polyhydroxy antibacterial castor oil monomer and isophorone diisocyanate, and uses dihydroxy-terminated polydimethylsiloxane and 2,2-dihydroxymethylpropionic acid as chain extenders to participate in the polyurethane polymerization reaction, thereby generating a polyurethane emulsion with a solid content of 30~40%, and the polyurethane emulsion is combined with other auxiliary materials to prepare a negative oxygen ion antibacterial and antiviral aquaculture pond coating; the coating not only has excellent antibacterial and antiviral properties, but also can release negative oxygen ions, has excellent water resistance and corrosion resistance, has excellent adhesion to different substrates, and is very practical. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the following examples, castor oil model is C110663, dihydroxy-terminated polydimethylsiloxane model is C303004, both provided by Shanghai Aladdin; negative oxygen ion powder is BK-0115, provided by Shijiazhuang Ruiteng Mineral Products Processing Co., Ltd.; silica powder particle size is 10~15nm; titanium dioxide model is R960; dispersant model is BN-1101, defoamer model is BYK-019, film-forming aid model is BN-K12, thickener model is RM-8W‌.

[0020] Embodiment 1: A preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating, comprising the following steps: Step 1: 55 mmol of dimethylaminoethyl methacrylate, 50 mL of acetonitrile and 4.1 mmol of polymerization inhibitor were mixed, heated to 45°C, 50 mmol of bromoalkane was slowly added dropwise, and the reaction was kept warm for 12 hours. After the reaction was completed, the mixture was cooled to room temperature, and the solid precipitate was washed with ether, filtered, and vacuum dried to obtain dimethylaminoethyl methacrylate quaternary ammonium salt. The polymerization inhibitor was hydroquinone, and the bromoalkane was bromotetradecane.

[0021] 2.5 mol of dimethylaminoethyl methacrylate quaternary ammonium salt and 2.2 mol of 1,6-hexanedithiol were mixed, 1 mol of castor oil and a photoinitiator were added, the mixture was stirred evenly and then irradiated under an ultraviolet lamp for 60 minutes. After the reaction, the product was collected and purified to obtain an antibacterial castor oil monomer. The photoinitiators were all photoinitiator 1173, and the amount of the photoinitiator used was 2 wt% of the total mass of the reaction system.

[0022] Step 2: Mix the antibacterial castor oil monomer and 1-thioglycerol, add a photoinitiator, stir evenly, and then place under ultraviolet light for 50 minutes. After the reaction, dilute with ethyl acetate and purify to obtain a polyhydroxy antibacterial castor oil monomer; the molar ratio of C=C and the thiol of 1-thioglycerol in the antibacterial castor oil monomer is 1:1.5. The photoinitiators are all photoinitiator 1173, and the amount of the photoinitiator is 2wt% of the total mass of the reaction system.

[0023] Step 3: In parts by mass, 32 parts of castor oil and 8 parts of polyhydroxy antibacterial castor oil monomer are mixed, heated to 75°C, stirred evenly, 40 parts of isophorone diisocyanate and dibutyltin dilaurate are added, and the reaction is kept warm for 4 hours, and then 8 parts of dihydroxy-terminated polydimethylsiloxane and 6 parts of 2,2-dihydroxymethylpropionic acid are added, and the reaction is continued for 2 hours, butanone is used to reduce the viscosity, the temperature is lowered to 40°C, triethylamine is added for neutralization for 30 minutes, and deionized water is emulsified and dispersed to obtain a polyurethane emulsion with a solid content of 35%; the amount of dibutyltin dilaurate used is 0.15wt% of the total mass of castor oil and isophorone diisocyanate.

[0024] Step 4: Mix the negative oxygen ion powder, silica powder, titanium dioxide and 1 / 2 mass part of deionized water, stir evenly, then add dispersant, defoaming agent, film-forming aid and thickener, then add polyurethane emulsion and 1 / 2 mass part of deionized water, stir evenly to obtain the aquaculture pond paint.

[0025] The specific amount of each component used, in parts by mass, is: 5 parts of negative oxygen ion powder, 1.5 parts of silica powder, 25 parts of titanium dioxide, 0.5 parts of dispersant, 0.5 parts of defoaming agent, 1 part of film-forming aid, 0.5 parts of thickener, 40 parts of polyurethane emulsion, and 22 parts of deionized water.

[0026] Embodiment 2: A preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating, comprising the following steps: Step 1: 55 mmol of dimethylaminoethyl methacrylate, 50 mL of acetonitrile and 4.1 mmol of polymerization inhibitor were mixed, heated to 45°C, 50 mmol of bromoalkane was slowly added dropwise, and the reaction was kept warm for 11 hours. After the reaction was completed, the mixture was cooled to room temperature, and the solid precipitate was washed with ether, filtered, and vacuum dried to obtain dimethylaminoethyl methacrylate quaternary ammonium salt. The polymerization inhibitor was hydroquinone, and the bromoalkane was tetradecane bromide.

[0027] 2.5 mol of dimethylaminoethyl methacrylate quaternary ammonium salt and 2.2 mol of 1,6-hexanedithiol were mixed, 1 mol of castor oil and a photoinitiator were added, the mixture was stirred evenly and then irradiated under an ultraviolet lamp for 70 minutes. After the reaction, the product was collected and purified to obtain an antibacterial castor oil monomer. The photoinitiators were all photoinitiator 1173, and the amount of the photoinitiator used was 2 wt% of the total mass of the reaction system.

[0028] Step 2: Mix the antibacterial castor oil monomer and 1-thioglycerol, add a photoinitiator, stir evenly, and then place under ultraviolet light for 55 minutes. After the reaction, dilute with ethyl acetate and purify to obtain a polyhydroxy antibacterial castor oil monomer; the molar ratio of C=C and the thiol of 1-thioglycerol in the antibacterial castor oil monomer is 1:1.5. The photoinitiators are all photoinitiator 1173, and the amount of the photoinitiator is 2wt% of the total mass of the reaction system.

[0029] Step 3: In parts by mass, 32 parts of castor oil and 9 parts of polyhydroxy antibacterial castor oil monomer are mixed, heated to 75°C, stirred evenly, 40 parts of isophorone diisocyanate and dibutyltin dilaurate are added, and the reaction is kept warm for 3.5 hours, and then 9 parts of dihydroxy-terminated polydimethylsiloxane and 6 parts of 2,2-dihydroxymethylpropionic acid are added, and the reaction is continued for 2.5 hours, butanone is used to reduce the viscosity, the temperature is lowered to 45°C, triethylamine is added for neutralization for 30 minutes, and deionized water is emulsified and dispersed to obtain a polyurethane emulsion with a solid content of 35%; the amount of dibutyltin dilaurate used is 0.15wt% of the total mass of castor oil and isophorone diisocyanate.

[0030] Step 4: Mix the negative oxygen ion powder, silica powder, titanium dioxide and 1 / 2 mass part of deionized water, stir evenly, then add dispersant, defoaming agent, film-forming aid and thickener, then add polyurethane emulsion and 1 / 2 mass part of deionized water, stir evenly to obtain the aquaculture pond paint.

[0031] The specific amount of each component used, in parts by mass, is: 5 parts of negative oxygen ion powder, 1.5 parts of silica powder, 25 parts of titanium dioxide, 0.5 parts of dispersant, 0.5 parts of defoaming agent, 1 part of film-forming aid, 0.5 parts of thickener, 40 parts of polyurethane emulsion, and 22 parts of deionized water.

[0032] Embodiment 3: A preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating, comprising the following steps: Step 1: 55 mmol of dimethylaminoethyl methacrylate, 50 mL of acetonitrile and 4.1 mmol of polymerization inhibitor were mixed, heated to 50°C, 50 mmol of bromoalkane was slowly added dropwise, and the reaction was kept warm for 10 hours. After the reaction was completed, the mixture was cooled to room temperature, and the solid precipitate was washed with ether, filtered, and vacuum dried to obtain dimethylaminoethyl methacrylate quaternary ammonium salt. The polymerization inhibitor was hydroquinone, and the bromoalkane was bromotetradecane.

[0033] 2.5 mol of dimethylaminoethyl methacrylate quaternary ammonium salt and 2.2 mol of 1,6-hexanedithiol were mixed, 1 mol of castor oil and a photoinitiator were added, the mixture was stirred evenly and then irradiated under an ultraviolet lamp for 80 minutes. After the reaction, the product was collected and purified to obtain an antibacterial castor oil monomer. The photoinitiators were all photoinitiator 1173, and the amount of the photoinitiator used was 2 wt% of the total mass of the reaction system.

[0034] Step 2: Mix the antibacterial castor oil monomer and 1-thioglycerol, add a photoinitiator, stir evenly, and then place under ultraviolet light for 60 minutes. After the reaction, dilute with ethyl acetate and purify to obtain a polyhydroxy antibacterial castor oil monomer; the molar ratio of C=C and the thiol of 1-thioglycerol in the antibacterial castor oil monomer is 1:1.5. The photoinitiators are all photoinitiator 1173, and the amount of the photoinitiator is 2wt% of the total mass of the reaction system.

[0035] Step 3: In parts by mass, 32 parts of castor oil and 10 parts of polyhydroxy antibacterial castor oil monomer are mixed, heated to 80°C, stirred evenly, 40 parts of isophorone diisocyanate and dibutyltin dilaurate are added, and the reaction is kept warm for 3 hours, and then 9 parts of dihydroxy-terminated polydimethylsiloxane and 6 parts of 2,2-dihydroxymethylpropionic acid are added, and the reaction is continued for 3 hours. Butanone reduces the viscosity, the temperature is lowered to 45°C, triethylamine is added for neutralization for 30 minutes, and deionized water is emulsified and dispersed to obtain a polyurethane emulsion with a solid content of 35%; the amount of dibutyltin dilaurate used is 0.15wt% of the total mass of castor oil and isophorone diisocyanate.

[0036] Step 4: Mix the negative oxygen ion powder, silica powder, titanium dioxide and 1 / 2 mass part of deionized water, stir evenly, then add dispersant, defoaming agent, film-forming aid and thickener, then add polyurethane emulsion and 1 / 2 mass part of deionized water, stir evenly to obtain the aquaculture pond paint.

[0037] The specific amount of each component used, in parts by mass, is: 5 parts of negative oxygen ion powder, 1.5 parts of silica powder, 25 parts of titanium dioxide, 0.5 parts of dispersant, 0.5 parts of defoaming agent, 1 part of film-forming aid, 0.5 parts of thickener, 40 parts of polyurethane emulsion, and 22 parts of deionized water.

[0038] Comparative Example 1: Example 3 was used as the control group. 1-Thioglycerol was not grafted in Comparative Example 1, and the other steps remained unchanged.

[0039] A preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating comprises the following steps: Step 1: 55 mmol of dimethylaminoethyl methacrylate, 50 mL of acetonitrile and 4.1 mmol of polymerization inhibitor were mixed, heated to 50°C, 50 mmol of bromoalkane was slowly added dropwise, and the reaction was kept warm for 10 hours. After the reaction was completed, the mixture was cooled to room temperature, and the solid precipitate was washed with ether, filtered, and vacuum dried to obtain dimethylaminoethyl methacrylate quaternary ammonium salt. The polymerization inhibitor was hydroquinone, and the bromoalkane was bromotetradecane.

[0040] 2.5 mol of dimethylaminoethyl methacrylate quaternary ammonium salt and 2.2 mol of 1,6-hexanedithiol were mixed, 1 mol of castor oil and a photoinitiator were added, the mixture was stirred evenly and then irradiated under an ultraviolet lamp for 80 minutes. After the reaction, the product was collected and purified to obtain an antibacterial castor oil monomer. The photoinitiators were all photoinitiator 1173, and the amount of the photoinitiator used was 2 wt% of the total mass of the reaction system.

[0041] Step 2: In parts by mass, 32 parts of castor oil and 10 parts of antibacterial castor oil monomer are mixed, heated to 80°C, stirred evenly, 40 parts of isophorone diisocyanate and dibutyltin dilaurate are added, and the reaction is kept warm for 3 hours, and then 9 parts of dihydroxy-terminated polydimethylsiloxane and 6 parts of 2,2-dihydroxymethylpropionic acid are added, and the reaction is continued for 3 hours. Butanone reduces the viscosity, the temperature is lowered to 45°C, triethylamine is added for neutralization for 30 minutes, and deionized water is emulsified and dispersed to obtain a polyurethane emulsion with a solid content of 35%; the amount of dibutyltin dilaurate used is 0.15wt% of the total mass of castor oil and isophorone diisocyanate.

[0042] Step 3: Mix the negative oxygen ion powder, silica powder, titanium dioxide and 1 / 2 mass part of deionized water, stir evenly, then add dispersant, defoaming agent, film-forming aid and thickener, then add polyurethane emulsion and 1 / 2 mass part of deionized water, stir evenly to obtain the aquaculture pond paint.

[0043] The specific amount of each component used, in parts by mass, is: 5 parts of negative oxygen ion powder, 1.5 parts of silica powder, 25 parts of titanium dioxide, 0.5 parts of dispersant, 0.5 parts of defoaming agent, 1 part of film-forming aid, 0.5 parts of thickener, 40 parts of polyurethane emulsion, and 22 parts of deionized water.

[0044] Comparative Example 2: Example 3 was used as the control group. In Comparative Example 2, dimethylaminoethyl methacrylate quaternary ammonium salt was not grafted, and the other steps remained unchanged.

[0045] A preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating comprises the following steps: Step 1: Mix castor oil and 1-thioglycerol, add a photoinitiator, stir evenly, and place under ultraviolet light for 60 minutes. After the reaction, dilute with ethyl acetate and purify to obtain a polyhydroxy castor oil monomer; the molar ratio of C=C of the castor oil and the thiol of 1-thioglycerol is 1:1.5. The photoinitiator is photoinitiator 1173, and the amount of the photoinitiator is 2wt% of the total mass of the reaction system.

[0046] Step 2: In parts by mass, 32 parts of castor oil and 10 parts of polyhydroxy castor oil monomer are mixed, heated to 80°C, stirred evenly, 40 parts of isophorone diisocyanate and dibutyltin dilaurate are added, and the reaction is kept warm for 3 hours, and then 9 parts of dihydroxy-terminated polydimethylsiloxane and 6 parts of 2,2-dihydroxymethylpropionic acid are added, and the reaction is continued for 3 hours, butanone is used to reduce the viscosity, the temperature is lowered to 45°C, triethylamine is added for neutralization for 30 minutes, and deionized water is emulsified and dispersed to obtain a polyurethane emulsion with a solid content of 35%; the amount of dibutyltin dilaurate used is 0.15wt% of the total mass of castor oil and isophorone diisocyanate.

[0047] Step 4: Mix the negative oxygen ion powder, silica powder, titanium dioxide and 1 / 2 mass part of deionized water, stir evenly, then add dispersant, defoaming agent, film-forming aid and thickener, then add polyurethane emulsion and 1 / 2 mass part of deionized water, stir evenly to obtain the aquaculture pond paint.

[0048] The specific amount of each component used, in parts by mass, is: 5 parts of negative oxygen ion powder, 1.5 parts of silica powder, 25 parts of titanium dioxide, 0.5 parts of dispersant, 0.5 parts of defoaming agent, 1 part of film-forming aid, 0.5 parts of thickener, 40 parts of polyurethane emulsion, and 22 parts of deionized water.

[0049] Comparative Example 3: Example 3 was used as the control group. In Comparative Example 3, no dihydroxy-terminated polydimethylsiloxane was introduced, and the other steps remained unchanged.

[0050] A preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating comprises the following steps: Step 1: 55 mmol of dimethylaminoethyl methacrylate, 50 mL of acetonitrile and 4.1 mmol of polymerization inhibitor were mixed, heated to 50°C, 50 mmol of bromoalkane was slowly added dropwise, and the reaction was kept warm for 10 hours. After the reaction was completed, the mixture was cooled to room temperature, and the solid precipitate was washed with ether, filtered, and vacuum dried to obtain dimethylaminoethyl methacrylate quaternary ammonium salt. The polymerization inhibitor was hydroquinone, and the bromoalkane was bromotetradecane.

[0051] 2.5 mol of dimethylaminoethyl methacrylate quaternary ammonium salt and 2.2 mol of 1,6-hexanedithiol were mixed, 1 mol of castor oil and a photoinitiator were added, the mixture was stirred evenly and then irradiated under an ultraviolet lamp for 80 minutes. After the reaction, the product was collected and purified to obtain an antibacterial castor oil monomer. The photoinitiators were all photoinitiator 1173, and the amount of the photoinitiator used was 2 wt% of the total mass of the reaction system.

[0052] Step 2: Mix the antibacterial castor oil monomer and 1-thioglycerol, add a photoinitiator, stir evenly, and then place under ultraviolet light for 60 minutes. After the reaction, dilute with ethyl acetate and purify to obtain a polyhydroxy antibacterial castor oil monomer; the molar ratio of C=C and the thiol of 1-thioglycerol in the antibacterial castor oil monomer is 1:1.5. The photoinitiators are all photoinitiator 1173, and the amount of the photoinitiator is 2wt% of the total mass of the reaction system.

[0053] Step 3: In parts by mass, 32 parts of castor oil and 10 parts of polyhydroxy antibacterial castor oil monomer are mixed, heated to 80°C, stirred evenly, 40 parts of isophorone diisocyanate and dibutyltin dilaurate are added, the reaction is kept warm for 3 hours, and then 6 parts of 2,2-dihydroxymethylpropionic acid are added, and the reaction is continued for 3 hours. Butanone reduces the viscosity, the temperature is lowered to 45°C, triethylamine is added for neutralization for 30 minutes, and deionized water is emulsified and dispersed to obtain a polyurethane emulsion with a solid content of 35%; the amount of dibutyltin dilaurate used is 0.15wt% of the total mass of castor oil and isophorone diisocyanate.

[0054] Step 4: Mix the negative oxygen ion powder, silica powder, titanium dioxide and 1 / 2 mass part of deionized water, stir evenly, then add dispersant, defoaming agent, film-forming aid and thickener, then add polyurethane emulsion and 1 / 2 mass part of deionized water, stir evenly to obtain the aquaculture pond paint.

[0055] The specific amount of each component used, in parts by mass, is: 5 parts of negative oxygen ion powder, 1.5 parts of silica powder, 25 parts of titanium dioxide, 0.5 parts of dispersant, 0.5 parts of defoaming agent, 1 part of film-forming aid, 0.5 parts of thickener, 40 parts of polyurethane emulsion, and 22 parts of deionized water.

[0056] Detection experiment: 1. Take the coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 3, apply them in a polytetrafluoroethylene mold, cure and dry them to form a coating film with a size of 2.5 cm×2.5 cm×200 μm, and test the water absorption of the coating film: immerse the coating film in deionized water for 24 hours, take it out after 24 hours, wipe off the surface moisture, weigh it, and compare it with the mass before the test to calculate the water absorption rate.

[0057] Test the water contact angle of the coating: drop 5 μL of deionized water on the coating surface, test 3 to 5 different positions, calculate the average value, and record the water contact angle.

[0058] 2. Take the coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 3, and take a fiber cement board that meets the requirements of JC / T412.1-2006, with a size of 50 cm×50 cm, and apply the coating to the surface of the fiber cement board with a coating thickness of 1.5 mm. After drying, place the fiber cement board in a sealed empty box, and test the negative oxygen ion release effect after 5 days. During the test, test 3 to 5 positions and take the average value.

[0059] 3. Take the coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 3, apply them in a polytetrafluoroethylene mold, cure and dry them to form a coating film, and test the antibacterial rate. The test bacteria is Escherichia coli. The test is carried out according to the AATCC100-2012 immersion method.

[0060] Specific test data are shown in Table 1. “ / ” indicates not tested or not recorded.

[0061] Table 1 Conclusion: The present invention discloses a negative oxygen ion antibacterial and antiviral aquaculture pond coating and a preparation process thereof. The scheme uses polyurethane emulsion as the main resin of the coating, adds negative oxygen ion powder, silica powder, titanium dioxide and other inorganic fillers, and then adds dispersants, defoaming agents, film-forming agents, thickeners and other coating additives to prepare a polyurethane coating with excellent antibacterial properties. The polyurethane coating can be used for surface coating of aquaculture ponds, and can better achieve the antibacterial and antiviral effects. The negative oxygen ion powder introduced in the scheme can release negative oxygen ions and improve air quality.

[0062] 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 implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating, characterized in that: The following steps are involved: Step 1: Mix dimethylaminoethyl methacrylate quaternary ammonium salt and 1,6-hexanedithiol, add castor oil and photoinitiator, stir evenly and place under ultraviolet light for 60-80 minutes. After the reaction is completed, collect the product and purify it to obtain antibacterial castor oil monomer; Step 2: Mix the antibacterial castor oil monomer and 1-thioglycerol, add a photoinitiator, stir evenly, and then irradiate under a UV lamp to react for 50 to 60 minutes. After the reaction is completed, dilute with ethyl acetate, purify, and obtain a polyhydroxy antibacterial castor oil monomer; Step 3: Mix castor oil and polyhydroxy antibacterial castor oil monomer, heat to 75-80°C, add isophorone diisocyanate and dibutyltin dilaurate after stirring evenly, keep warm for 3-4 hours, then add dihydroxy-terminated polydimethylsiloxane and 2,2-dihydroxymethylpropionic acid, continue to react for 2-3 hours, use butanone to reduce viscosity, cool to 40-45°C, add triethylamine for neutralization for 20-30 minutes, emulsify and disperse with deionized water to obtain a polyurethane emulsion; Step 4: Mix the negative oxygen ion powder, silica powder, titanium dioxide and 1 / 2 mass part of deionized water, stir evenly, then add dispersant, defoaming agent, film-forming aid and thickener, then add polyurethane emulsion and 1 / 2 mass part of deionized water, stir evenly to obtain the aquaculture pond paint.

2. The preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating according to claim 1, characterized in that: In step 4, the specific amounts of each component used, in parts by mass, are: 4 to 6 parts of negative oxygen ion powder, 1 to 1.5 parts of silica powder, 20 to 25 parts of titanium dioxide, 0.3 to 0.5 parts of dispersant, 0.3 to 0.5 parts of defoaming agent, 0.5 to 1 parts of film-forming aid, 0.3 to 0.5 parts of thickener, 35 to 40 parts of polyurethane emulsion, and 20 to 25 parts of deionized water.

3. The preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating according to claim 1, characterized in that: In step 3, the amount of each component used is specifically as follows, in parts by mass: 30 to 35 parts of castor oil, 8 to 10 parts of polyhydroxy antibacterial castor oil monomer, 35 to 40 parts of isophorone diisocyanate, 8 to 10 parts of dihydroxy-terminated polydimethylsiloxane, and 6 to 8 parts of 2,2-dihydroxymethylpropionic acid; the amount of dibutyltin dilaurate used is 0.1 to 0.15wt% of the total mass of castor oil and isophorone diisocyanate.

4. The preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating according to claim 1, characterized in that: In step 2, the molar ratio of C=C and the thiol group of 1-thioglycerol in the antibacterial castor oil monomer is 1:(1.5-2).

5. The preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating according to claim 1, characterized in that: In step 1, the molar ratio of dimethylaminoethyl methacrylate quaternary ammonium salt, 1,6-hexanedithiol, and castor oil is (2-2.5): (2-2.2):

1.

6. The preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating according to claim 1, characterized in that: In step 1 and step 2, the photoinitiator is photoinitiator 1173, and the amount of the photoinitiator used is 2-2.5 wt % of the total mass of the reaction system.

7. The preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating according to claim 1, characterized in that: The preparation steps of dimethylaminoethyl methacrylate quaternary ammonium salt are as follows: dimethylaminoethyl methacrylate, acetonitrile and a polymerization inhibitor are mixed, heated to 45-50° C., bromoalkane is slowly added dropwise, and the reaction is carried out for 10-12 hours at a temperature keeping the temperature high. After the reaction is completed, the quaternary ammonium salt is cooled to room temperature, and a solid precipitate is precipitated by washing with ether, filtered, and vacuum dried to obtain dimethylaminoethyl methacrylate quaternary ammonium salt.

8. The preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating according to claim 7, characterized in that: The polymerization inhibitor is hydroquinone, and the molar ratio of the polymerization inhibitor to dimethylaminoethyl methacrylate is 1:(13-14); the molar ratio of dimethylaminoethyl methacrylate to brominated alkane is (1-1.1):

1.

9. The preparation process of a negative oxygen ion antibacterial and antiviral aquaculture pond coating according to claim 7, characterized in that: The brominated alkane is brominated tetradecane or brominated hexadecane, and the solid content of the polyurethane emulsion is 30-40%.

10. A negative oxygen ion antibacterial and antiviral aquaculture pond coating prepared according to the preparation process described in any one of claims 1 to 9.

Images