CN117964943A - Cinnamaldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material, and preparation method and application thereof - Google Patents
Cinnamaldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material, and preparation method and application thereof Download PDFInfo
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- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 84
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 74
- KJPRLNWUNMBNBZ-QPJJXVBHSA-N (E)-cinnamaldehyde Chemical compound O=C\C=C\C1=CC=CC=C1 KJPRLNWUNMBNBZ-QPJJXVBHSA-N 0.000 title claims abstract description 62
- 229940117916 cinnamic aldehyde Drugs 0.000 title claims abstract description 62
- KJPRLNWUNMBNBZ-UHFFFAOYSA-N cinnamic aldehyde Natural products O=CC=CC1=CC=CC=C1 KJPRLNWUNMBNBZ-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 239000000463 material Substances 0.000 title claims abstract description 44
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- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 3
- 239000011737 fluorine Substances 0.000 claims abstract description 3
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- 239000002244 precipitate Substances 0.000 claims description 16
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- -1 Polytetrafluoroethylene Polymers 0.000 claims description 10
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 9
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- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 6
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- 238000000034 method Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000004812 Fluorinated ethylene propylene Substances 0.000 claims description 4
- 229920009441 perflouroethylene propylene Polymers 0.000 claims description 4
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 claims description 2
- 239000012362 glacial acetic acid Substances 0.000 claims description 2
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- APQHKWPGGHMYKJ-UHFFFAOYSA-N Tributyltin oxide Chemical compound CCCC[Sn](CCCC)(CCCC)O[Sn](CCCC)(CCCC)CCCC APQHKWPGGHMYKJ-UHFFFAOYSA-N 0.000 description 3
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Abstract
The invention discloses a cinnamaldehyde/titanium dioxide composite antibacterial ultraviolet resistant material, a preparation method and application thereof. The cinnamaldehyde/titanium dioxide composite antibacterial ultraviolet resistant material contains 2-4wt% of cinnamaldehyde and 96-98wt% of titanium dioxide. The preparation method of the cinnamaldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material comprises the following steps: synthesizing nano TiO 2, organically modifying TiO 2 to obtain o-TiO 2, and grafting cinnamaldehyde CA to o-TiO 2 to prepare o-TiO 2 -CA. The cinnamaldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material overcomes the defect of a single antibacterial material, combines different advantages of the single antibacterial material, and shows excellent and stable antibacterial performance and anti-ultraviolet capability when the antibacterial coating prepared by using the cinnamaldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material is applied to the surface of a fluorine-containing film.
Description
Technical Field
The invention relates to the field of antibacterial materials, in particular to a cinnamaldehyde/titanium dioxide composite antibacterial ultraviolet resistant material, and a preparation method and application thereof.
Background
In recent years, people are paying more attention to food safety. Titanium dioxide (TiO 2) is an approved food additive in solving the food-borne threat caused by microorganisms and has been used in the field of food preservation and antibacterial. The TiO 2 has low cost, no toxicity and good chemical stability, and can have antibacterial effect by using ultraviolet light contained in sunlight or fluorescent lamps as an excitation source. However, since the antibacterial effect of titanium dioxide is too dependent on light, the antibacterial effect is poor under dark conditions. While organic chemical compositions are also commonly used to control pathogenic bacterial strains affecting food safety, some polymeric organic chemical compositions approved by regulatory authorities and used as food preservatives pose a degree of threat to human health and, therefore, people tend to use safer natural structure plant antibacterial materials. The natural structure plant antibacterial materials such as Cinnamaldehyde (CA), eugenol and the like have the advantages of wide sources, abundant resources, lower cost, safety, environmental protection and the like, but the single plant antibacterial material also has the serious problems of easy migration, poor mechanical property, short antibacterial time and the like. Therefore, the research of the composite antibacterial material which integrates the advantages of excellent mechanical property, heat resistance, safety and environmental protection of the natural structure antibacterial material, high antibacterial property and the like of the inorganic antibacterial material has wide application prospect.
Meanwhile, oxidation by ultraviolet rays is also one of the important factors causing the denaturation of the contents. Thus, uv protection is also of particular importance in the packaging industry. Aluminum foils have long been the most suitable packaging materials for use primarily in blocking ultraviolet and visible light, but they suffer from several drawbacks including low transparency, high cost, lack of recyclability, and the like. The nano material, especially inorganic nano particles such as metal oxide CeO 2、TiO2 and ZnO, can also realize the anti-ultraviolet effect by absorbing light in the ultraviolet region, has the advantages of high efficiency, low cost and the like, and has wide commercial availability.
Since plastic packaging materials are often used to directly contact the contents, the growth and proliferation of microorganisms on the plastic packaging materials will affect the quality of the contents. Compared with other polymer films, the fluoropolymer plastic film has some performance advantages, mainly has good chemical resistance, moisture resistance, oxidation resistance, wear resistance, high temperature resistance, low temperature resistance and the like, and is widely applied to the fields of biomedicine, pharmacy and energy, so that the design and synthesis of a safe and efficient composite antibacterial material with ultraviolet resistance and application of the composite antibacterial material to the fluoroplastic film have become one of urgent demands.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a cinnamaldehyde/titanium dioxide composite antibacterial and ultraviolet resistant material, a preparation method and application thereof, and a coating prepared from the cinnamaldehyde/titanium dioxide composite antibacterial and ultraviolet resistant material has excellent antibacterial performance and ultraviolet resistant performance.
In order to achieve the above purpose, the invention firstly provides a preparation method of cinnamaldehyde/titanium dioxide composite antibacterial and ultraviolet resistant material, which comprises the following steps:
1) Preparing a mixed solution comprising deionized water, tetrabutyl titanate, ethanol and a hydrolysis inhibitor, and heating the mixed solution to generate a precipitate; washing the generated precipitate with ethanol, and drying the washed precipitate to obtain nano titanium dioxide TiO 2;
2) Adding a silane coupling agent into an ethanol-water mixed solution, adjusting the pH to 3-4, adding the nano titanium dioxide TiO 2, and heating to generate a precipitate; washing the precipitate with ethanol, and drying to obtain silane coupling agent modified nano titanium dioxide o-TiO 2;
3) Dissolving silane coupling agent modified nano titanium dioxide in absolute ethyl alcohol, dispersing, and adding cinnamaldehyde to obtain a mixed solution; heating the mixed solution under the condition of nitrogen; and (3) washing with ethanol after centrifugation, and drying the precipitate to obtain the cinnamaldehyde/titanium dioxide composite antibacterial and ultraviolet-resistant material.
As a preferred scheme of the invention, the volume ratio of tetrabutyl ester, ethanol, hydrolysis inhibitor and deionized water in the step 1) is 1: (2-4): (0.1-0.4): (0.2-0.4); the heating temperature is 120-180 ℃ and the heating time is 15-20h; the hydrolysis inhibitor is triethanolamine or glacial acetic acid.
As a preferred embodiment of the present invention, the step 2) adds a silane coupling agent to the ethanol-water mixed solution, wherein the volume ratio of the silane coupling agent, water and ethanol is 1:10: (30-60); the concentration of the nano titanium dioxide TiO 2 in the solution after adding the nano titanium dioxide TiO 2 is 31.95-63.90 g/L; the heating temperature is 40-60 ℃ and the heating time is 1-3h.
As a preferred scheme of the invention, the volume ratio of the ethanol to the cinnamaldehyde in the step 3) is 1: (0.06-0.1), the concentration of the silane coupling agent modified nano titanium dioxide o-TiO 2 in the mixed solution is 8-20g/L.
As a preferred embodiment of the present invention, the silane coupling agent in the step 2) is one or more of KH550, KH792 and DL 602.
The invention also provides the cinnamaldehyde/titanium dioxide composite antibacterial and ultraviolet resistant material prepared by the preparation method, wherein the content of the cinnamaldehyde in the cinnamaldehyde/titanium dioxide composite antibacterial and ultraviolet resistant material is 2-4wt% and the content of the silane coupling agent modified nano titanium dioxide is 96-98wt%.
The invention further provides an antibacterial and anti-ultraviolet coating prepared by using the cinnamyl aldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material, wherein the antibacterial and anti-ultraviolet coating comprises the cinnamyl aldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material, a diluent and a coating master batch; wherein the content of the cinnamaldehyde/titanium dioxide composite antibacterial ultraviolet resistant material is 1.8-7.8wt%, the content of the diluent is 13-26wt%, and the content of the coating master batch is 66.2-85.2wt%.
As a preferential scheme of the invention, the diluent is one or more of butyl acetate, ethyl acetate and toluene; the coating master batch is one or more of Polytetrafluoroethylene (PTFE) coating, fluorinated ethylene propylene copolymer (FEP) coating and polyvinylidene fluoride (PVDF) coating.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
According to the scheme, the antibacterial and anti-ultraviolet material is prepared by compounding the cinnamaldehyde and the titanium dioxide, the antibacterial capability, the anti-ultraviolet performance and the like can be mutually supplemented, the weak antibacterial effect of the titanium dioxide under the dark condition is compensated, the high migration phenomenon of the cinnamaldehyde in the polymer is eliminated, the prepared antibacterial and anti-ultraviolet coating is good in antibacterial effect and strong in anti-ultraviolet capability, has a wide application prospect, and the preparation method of the antibacterial coating is simple, safe and healthy, and is easy to realize mass production.
Drawings
Fig. 1: scanning Electron Microscope (SEM) images of TiO 2 and o-TiO 2 -CA in example 1;
fig. 2: infrared spectra of TiO 2、o-TiO2 and o-TiO 2 -CA in example 1;
Fig. 3: the results of the E.coli resistance experiments under dark conditions for the coatings of example 1 containing different amounts of TiO 2、o-TiO2 and o-TiO 2 -CA are shown;
Fig. 4: the results of the antibacterial experiments of the o-TiO 2 -CA coating of example 3 before and after wiping with an alcohol cotton ball for 3 minutes are shown;
Fig. 5: the TiO 2, CA and o-TiO 2 -CA of example 3 were applied to the PVDF surface of the fluorine-containing film for UVA and UVB shielding, respectively.
Detailed Description
The invention is further illustrated and described below in connection with specific embodiments. The described embodiments are merely exemplary of the present disclosure and do not limit the scope. The technical features of the embodiments of the invention can be combined correspondingly on the premise of no mutual conflict.
In the following examples, each material is commercially available and each process is a common process in the art unless otherwise specified.
In the following examples, antibacterial properties and ultraviolet resistance against E.coli were measured as follows:
1. antibacterial properties: the antibacterial performance of the PVDF film against Escherichia coli was tested with reference to the national standard GB/T31402-2015 of the people's republic of China.
2. Uv resistance: the transmittance of the film (4 cm. Times.3 cm) was measured using an ultraviolet-visible spectrophotometer equipped with an integrating sphere attachment. The ultraviolet-visible transmission spectrum is in the wavelength range of 200-800 nm, and the resolution is 0.5nm. The shielding percentages of UVB ultraviolet (280-320 nm) and UVA ultraviolet (320-400 nm) are calculated by formulas (1) and (2), and are respectively:
example 1
1) A mixed solution of deionized water, TBOT, ethanol and acetic acid was transferred to a polytetrafluoroethylene autoclave and heated in an electric drying oven at 150 ℃ for 15h, where V Water and its preparation method ：VTBOT：V Ethanol ：V Acetic acid = 0.2:1:2:0.1; washing the precipitate with ethanol, centrifuging at 7500rpm, removing excessive ethanol, repeating the above operation for 3 times, and oven drying to obtain nanometer titanium dioxide TiO 2.
2) 3G of silane coupling agent KH550 were dissolved in an ethanol-water mixed solution, wherein V Water and its preparation method ：V Ethanol = 1:3, adjusting the pH value to 4 by using hydrochloric acid, heating in a water bath at 40 ℃ for reaction for 1h, adding the ethanol-water suspension of nano TiO 2, stirring and mixing for 10min, wherein the adding amount of nano TiO 2 is 10g, and V Water and its preparation method ：V Ethanol =1: 3, a step of; the water bath heating and stirring reaction at 40 ℃ are continued for 3 hours. And dissolving the organically modified nano TiO 2 obtained by the reaction in absolute ethyl alcohol, centrifuging at 11000rpm by adopting a high-speed centrifuge, and taking a precipitation part. Repeating the above operation for 5 times, and drying to obtain the silane coupling agent modified nano titanium dioxide o-TiO 2.
3) 1G of o-TiO 2 was dissolved in 100mL of absolute ethanol, and 6mL of cinnamaldehyde was added after dispersion. The reaction was carried out at 60℃under nitrogen for 12h. Centrifuging and washing with absolute ethanol for 3 times, centrifuging at 11000rpm with a high-speed centrifuge, collecting the precipitate, and oven drying to obtain scanning electron microscope images of cinnamaldehyde grafted o-TiO 2-CA;TiO2 and o-TiO 2 -CA shown in figure 1, and infrared spectrograms of TiO 2、o-TiO2 and o-TiO 2 -CA shown in figure 2.
4) 0.06G/0.16g/0.26g of TiO 2 or CA or o-TiO 2 -CA are respectively dispersed in 0.5mL of toluene, mixed, dripped into PTFE coating, and stirred and mixed. And coating a coating with the thickness of 25um on the PVDF film by adopting a four-sided film coater, curing for 5min at 100 ℃, and aging for 48h at 50 ℃ to finally obtain the TiO 2@PVDF、CA@PVDF、o-TiO2 -CA@PVDF antibacterial film with different contents.
As shown in FIG. 3, when the addition amount of CA was 0.26g, the antibacterial rate of CA@PVDF antibacterial film against Escherichia coli was as high as 97.89%, demonstrating that CA has excellent antibacterial properties under dark conditions. When the addition amount of o-TiO 2 -CA is 0.26g, the antibacterial rate of o-TiO 2 -CA@PVDF to escherichia coli reaches the maximum, which is 90.28%. And the antibacterial rate of TiO 2 @PVDF against escherichia coli is only 69.4%. Under the same addition amount, the antibacterial rate of o-TiO 2 -CA@PVDF on escherichia coli is better than that of TiO 2 @PVDF. This is because o-TiO 2 -CA is distributed on the surface of PVDF film after it is added to PTFE coating, and grafted CA tends to be distributed on the surface of composite antibacterial material. After bacteria in the air are adsorbed on the surface of the polymer, tiO 2 and CA which are contacted with o-TiO 2-CA.o-TiO2 -CA distributed on the surface of the film show cooperation of different antibacterial mechanisms, so that death of the bacteria is accelerated. After the bacteria are contacted with CA grafted on the surface of o-TiO 2, the cell membranes of the bacteria are destroyed, protein denaturation occurs, and the bacteria are inactivated and die; meanwhile, under the dark experimental condition, the nano TiO 2 on the surface of the composite material releases trace titanium ions through contact with moisture in the air, and at the moment, the titanium ions can destroy bacterial cell membranes through the activity of the titanium ions, and can diffuse into bacteria through the cell membranes destroyed by CA, so that the aim of bacterial denaturation and death is fulfilled.
Example 2
1) The mixed solution of deionized water, TBOT, ethanol and acetic acid was transferred to a polytetrafluoroethylene autoclave and heated in an electric drying oven at 180 ℃ for 20h. Wherein V Water and its preparation method ：VTBOT：V Ethanol ：V Acetic acid = 0.2:1:3:0.1; washing the precipitate with ethanol, centrifuging at 7500rpm, removing excessive ethanol, repeating the above operation for 3 times, and oven drying to obtain nanometer titanium dioxide TiO 2.
2) 3G of silane coupling agent KH792 were dissolved in an ethanol-water mixed solution, wherein V Water and its preparation method ：V Ethanol =1: 3, adjusting the pH value to 4 by hydrochloric acid, heating in a water bath at 50 ℃ for reaction for 1h, adding the ethanol-water suspension of nano TiO 2, stirring and mixing for 10min, wherein the adding amount of nano TiO 2 is 5g, and V Water and its preparation method ：V Ethanol = 1:5, a step of; the water bath heating and stirring reaction at 40 ℃ are continued for 1h. And dissolving the organically modified nano TiO 2 obtained by the reaction in absolute ethyl alcohol, centrifuging at 11000rpm by adopting a high-speed centrifuge, and taking a precipitation part. Repeating the above operation for 5 times, and drying to obtain the silane coupling agent modified nano titanium dioxide o-TiO 2.
3) 1G of o-TiO 2 was dissolved in 100mL of absolute ethanol, and 8mL of cinnamaldehyde was added after dispersion. The reaction was carried out at 50℃under nitrogen for 18h. Centrifuging and washing 3 times by using absolute ethyl alcohol, centrifuging at 11000rpm by using a high-speed centrifuge, taking a precipitation part, and drying to obtain cinnamaldehyde grafted o-TiO 2 -CA.
4) 0.26G of TiO 2 or CA or o-TiO 2 -CA are respectively dispersed in 0.5mL of toluene, mixed and dripped into the FTE coating, stirred and mixed. And coating a coating with the thickness of 25um on the PVDF film by adopting a four-sided film coater, curing for 5min at 100 ℃, and aging for 48h at 50 ℃ to finally obtain the TiO 2@PVDF、CA@PVDF、o-TiO2 -CA@PVDF antibacterial film with different contents.
Example 3
1) A mixed solution of deionized water, TBOT, ethanol and acetic acid was transferred to a polytetrafluoroethylene autoclave and heated in an electric drying oven at 200 ℃ for 17h, where V Water and its preparation method ：VTBOT：V Ethanol ：V Acetic acid = 0.3:1:2.5:0.1. washing the precipitate with ethanol, centrifuging at 7500rpm, removing excessive ethanol, repeating the above operation for 3 times, and oven drying to obtain nanometer titanium dioxide TiO 2.
2) 3G of silane coupling agent KH550 were dissolved in an ethanol-water mixed solution, wherein V Water and its preparation method ：V Ethanol = 1:4, a step of; adjusting the pH to 4 by hydrochloric acid, heating in a water bath at 40 ℃ for reaction for 1h, adding the ethanol-water suspension of nano TiO 2, stirring and mixing for 10min, wherein the adding amount of nano TiO 2 is 12g, and V Water and its preparation method ：V Ethanol =1: 4, a step of; the water bath heating and stirring reaction at 60 ℃ is continued for 1h. And dissolving the organically modified nano TiO 2 obtained by the reaction in absolute ethyl alcohol, centrifuging at 11000rpm by adopting a high-speed centrifuge, and taking a precipitation part. Repeating the above operation for 5 times, and drying to obtain the silane coupling agent modified nano titanium dioxide o-TiO 2.
3) 2G of o-TiO 2 was dissolved in 100mL of absolute ethanol, and 10mL of cinnamaldehyde was added after dispersion. The reaction was carried out at 40℃under nitrogen for 24 hours. Centrifuging and washing 3 times by using absolute ethyl alcohol, centrifuging at 11000rpm by using a high-speed centrifuge, taking a precipitation part, and drying to obtain cinnamaldehyde grafted o-TiO 2 -CA.
4) 0.06G of TiO 2 or CA or o-TiO 2 -CA was dispersed in 1mL of toluene, mixed and dropped into PVDF paint. And coating a coating with the thickness of 25um on the PVDF film by adopting a four-sided film coater, curing for 5min at 100 ℃, and aging for 48h at 50 ℃ to finally obtain the TiO 2@PVDF、CA@PVDF、o-TiO2 -CA@PVDF antibacterial film with different contents.
The stability of the antibacterial material on the surface of the film greatly influences the antibacterial action time and effect, and the more stable antibacterial material can show more remarkable antibacterial effect. Although the CA@PVDF film in the antibacterial performance test in FIG. 3 shows good performance, the antibacterial stability test result is shown in FIG. 4, when the addition amount of the antibacterial material is 0.26g, after three minutes of wiping by absolute ethyl alcohol, the antibacterial rate of the CA@PVDF film to escherichia coli is reduced by 69.99%, and the absolute ethyl alcohol enables the CA to migrate more on the surface of the film. This is due to the fact that when a single CA small molecule is used as an antibacterial additive material, the single CA small molecule is easy to migrate and run off in the polymer coating, and the application range of the CA@PVDF antibacterial film is limited to a large extent. While FIG. 4 shows that the o-TiO 2 -CA@PVDF film is hardly affected by absolute ethanol, and still maintains good antibacterial properties. Proved that the o-TiO 2 -CA can show excellent and stable antibacterial performance when being applied to PVDF film, and has wide application prospect. As shown in FIG. 5, when the addition amount of the antibacterial material is 0.26g, the UVA and UVB shielding of the CA@PVDF film are only 51.93% and 69.12%, respectively, and the UVA and UVB shielding of the o-TiO 2 -CA@PVDF film are 68.72% and 86.06%, respectively, which means that the inorganic-organic composite antibacterial material o-TiO 2 -CA is formed by introducing TiO 2 and CA, so that the ultraviolet resistance of the antibacterial film is greatly improved, and the application scene of the packaging film is further widened.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (10)
1. The preparation method of the cinnamaldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material is characterized by comprising the following steps of:
1) Preparing a mixed solution comprising deionized water, tetrabutyl titanate, ethanol and a hydrolysis inhibitor, and heating the mixed solution to generate a precipitate; washing the generated precipitate with ethanol, and drying the washed precipitate to obtain nano titanium dioxide TiO 2;
2) Adding a silane coupling agent into an ethanol-water mixed solution, adjusting the pH to 3-4, adding the nano titanium dioxide TiO 2, and heating to generate a precipitate; washing the precipitate with ethanol, and drying to obtain silane coupling agent modified nano titanium dioxide o-TiO 2;
3) Dissolving silane coupling agent modified nano titanium dioxide in absolute ethyl alcohol, dispersing, and adding cinnamaldehyde to obtain a mixed solution; heating the mixed solution under the condition of nitrogen; and (3) washing with ethanol after centrifugation, and drying the precipitate to obtain the cinnamaldehyde/titanium dioxide composite antibacterial and ultraviolet-resistant material.
2. The preparation method according to claim 1, wherein the volume ratio of tetrabutyl titanate, ethanol, hydrolysis inhibitor and deionized water in the step 1) is 1: (2-4): (0.1-0.4): (0.2-0.4); the heating temperature is 120-180 ℃ and the heating time is 15-20h.
3. The method according to claim 1, wherein the step 2) is to add a silane coupling agent to the ethanol-water mixed solution, the volume ratio of the silane coupling agent, water and ethanol being 1:10: (30-60); the concentration of the nano titanium dioxide TiO 2 in the solution after adding the nano titanium dioxide TiO 2 is 31.95-63.90g/L; the heating temperature is 40-60 ℃ and the heating time is 1-3h.
4. The method according to claim 1, wherein the volume ratio of ethanol to cinnamaldehyde in the step 3) is 1: (0.06-0.1), the concentration of the silane coupling agent modified nano titanium dioxide o-TiO 2 in the mixed solution is 8-20g/L.
5. The method according to claim 1, wherein the hydrolysis inhibitor in step 1) is triethanolamine or glacial acetic acid.
6. The method according to claim 1, wherein the silane coupling agent in the step 2) is one or more of KH550, KH792 and DL 602.
7. The cinnamaldehyde/titanium dioxide composite antibacterial and ultraviolet resistant material prepared by the preparation method according to claim 1, wherein the content of cinnamaldehyde in the cinnamaldehyde/titanium dioxide composite antibacterial and ultraviolet resistant material is 2-4wt% and the content of silane coupling agent modified nano titanium dioxide is 96-98wt%.
8. An antibacterial and anti-ultraviolet coating prepared by using the cinnamaldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material according to claim 7, wherein the antibacterial and anti-ultraviolet coating comprises the cinnamaldehyde/titanium dioxide composite antibacterial and anti-ultraviolet material, a diluent and a coating master batch; wherein the content of the cinnamaldehyde/titanium dioxide composite antibacterial ultraviolet resistant material is 1.8-7.8wt%, the content of the diluent is 13-26wt%, and the content of the coating master batch is 66.2-85.2wt%.
9. The antimicrobial uv resistant coating according to claim 8, wherein the diluent is one or more of butyl acetate, ethyl acetate and toluene;
The coating master batch is one or more of Polytetrafluoroethylene (PTFE) coating, fluorinated ethylene propylene copolymer (FEP) coating and polyvinylidene fluoride (PVDF) coating.
10. Use of the antimicrobial uv-resistant coating according to claim 8 for the preparation of fluorine-containing films.
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