CN107082905A - The method that method prepares the silver-colored long acting antibiotic film of polyurethane nano is modified after ultraviolet light - Google Patents
The method that method prepares the silver-colored long acting antibiotic film of polyurethane nano is modified after ultraviolet light Download PDFInfo
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- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
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Abstract
The present invention relates to modifying the method that method prepares the silver-colored long acting antibiotic film of polyurethane nano after a kind of ultraviolet light, (1) is by diisocyanate and PolyTHF hybrid reaction；Plus the acetone soln of crosslinking agent, chain extender, then add dihydromethyl propionic acid and catalyst reaction, obtain PU；Add the dimethyl formamide solution of silver nitrate into polyurethane solutions, stir evenly film forming, be heat-treated, obtain polyurethane nano Ag films；(2) 4,4 ' dihydroxy benaophenonels and long-chain alkyl halide are reacted, obtains 4,4 ' double long-chain alkoxy base benzophenone；4,4 ' double long-chain alkoxy base benzophenone obtain 4,4 ' double long-chain alkoxy base Benzophenonehydrazones with hydration hydrazine reaction；4,4 ' double long-chain alkoxy base Benzophenonehydrazones are oxidized to react to obtain chain alkyl diazomethane；(3) chain alkyl diazomethane is dissolved in solvent, is coated to polyurethane nano Ag films surface, through ultraviolet light, produces.The present invention can realize long acting antibiotic.
Description
Technical field
The present invention relates to the method that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light, belong to
Anti-biotic material technical field.
Background technology
Polyurethane is the important medical macromolecular materials of a class, with excellent blood compatibility, good Biostatic
Property and mechanical property.Fu Qiangs etc. are (in Tan Hong, Li Jiehua, design, preparation and the performance of Fu Qiang's bio-medical phosphatide polyurethane
State's science:Chemistry, 42 (5), pp 661-675,2012.) research shows, polyurethane have with native blood vessels most match it is suitable
Ying Xing, be particularly suitable for use in blood contacting devices, has irreplaceable effect in the treatment of surgical operation.But, insertion type
Medical macromolecular materials need to have long-term antimicrobial efficiency, otherwise easily cause postoperative infection during clinical practice, cause operation and medical treatment
Accident.According to NIH's rough estimates, 80% bacteriosis is relevant with medical material.With cardiovascular system
Exemplified by, Prosthesis infects the caused death rate close to 100%.Therefore, obtain that antibiotic property is good, antibacterial phase length medical high polymer
Material, is also the crossing domain of traditional subject such as chemistry, materialogy, biology as current medical science urgent problem to be solved
Study hotspot.
In recent years, the research of nano silver material gets more and more people's extensive concerning.Silver is as inorganic antiseptic, with remote
History, its medical value is in ancient times《Compendium of Materia Medica》In just have described.In nearest decades, antiseptic is especially received
The research substantial increase of meter Yin anti-microbial property, application of the Nano Silver in biomedicine also has been a great concern.Nanometer
Silver can be applied to textile fabric and wound dressing, food conservation container, catheter, bandage, drinking water disinfection, family's antibiotic paint
In terms of tooth compound resin.It is as a kind of broad spectrum activity antiseptic, to Escherichia coli, monocyte Listeria, golden yellow
The mushrooms such as color staphylococcus have high toxicity, but have hypotoxicity for zooblast.
The size of nano-Ag particles has been provided simultaneously with nano material and elemental silver between atom and Macroscopic particulates
Good characteristic, has the advantages that specific surface area is big, sterilizing ability is strong.When the size of silver reaches nanoscale, it can be rapid molten
Ag is dissociated into liquid+, and play antibacterial action.At present, the synthesis of nanometer silver antimicrobial polyurethane material is mostly first by poly- ammonia
Ester material is synthesized, then silver nano-grain is distributed in polyurethane material.For example：Chinese patent document CN105294983A (Shens
Please number：201510669684.9) a kind of antibacterial Thermoplastic polyurethane composite material and preparation method thereof is disclosed, in reactive extrursion
Inorganic antibacterial material is added in machine.But, this method is easily caused silver nano-grain and disperses uneven, easily reunites.
In order to extend the antibacterial cycle of polyurethane-nano silver material, people also expand research extensively and profoundly.Wherein,
Hydrophobically modified is the important channel for making polyurethane-nano silver material realize long acting antibiotic activity, the hydrophobic membrane energy of modified formation
" soft " barrier is formed between nano-Ag particles and external environment, therefore, it is possible to extend its antibacterial cycle.At present, polymer is thin
The research that water is modified depends on special chemical reaction, i.e., obtain the polyurethane with specific function group first, then
Implement incident click reactions on its surface, introduce hydrophobic performance group and be modified.Fournier et al.
(Fournier D,De Geest B G,Du Prez F E.On-demand click functionalization of
polyurethane films and foams[J].Polymer,2009,50(23):5362-5367.) first from Belgium
Recticel companies have purchased surface-functionalized polyurethane sponge (surface group is alkynyl), then with hydrophobic alkyl chain
Azido compound carry out 1,3- Dipolar Cycloadditions with it so that obtaining surface has the polyurethane sponge material of hydrophobic performance
Material.Nystrom et al. (Nystrom D, Lindqvist J, Ostmark E, et al.Superhydrophobic and
self-cleaning bio-fiber surfaces via ATRP and subsequent
postfunctionalization[J].ACS applied materials&interfaces,2009,1(4):816-
823.), Xu et al. (Xu J, Boyer C.Visible light photocatalytic thiol-ene reaction:an
elegant approach for fast polymer postfunctionalization and step-growth
polymerization[J].Macromolecules,2015,48(3):520-529.) also respectively purchased from Sigma-
The functional fiber element of Aldrich, functional poly butadiene surface introduce hydrophobic alkyl chain, reach that raising is hydrophobic
Purpose.However, this hydrophobically modified mode is required to polymer surfaces with special functional group, moreover, in order to ensure rear
The smooth implementation of continuous modified-reaction, the chemical property of these functional groups (such as alkynyl, alkenyl, nitrine) is often more active,
It is prone to side reaction and goes bad, cause the synthesis difficulty of this kind of polymer big, is not particularly suited for the poly- ammonia generally used at present
The surface of ester material is modified.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides modification method after a kind of ultraviolet light and prepares polyurethane-Nano Silver
The method of long acting antibiotic film.
Technical scheme is as follows：
The method that method prepares polyurethane-nano silver long-acting antibacterial film is modified after a kind of ultraviolet light, including step is such as
Under：
(1) preparation of polyurethane-nano silver film
Diisocyanate and PolyTHF are mixed, 1-10h is reacted in 80-120 DEG C；Crosslinking agent, chain extender are added, then
Dihydromethyl propionic acid and catalyst are added, 1-10h is reacted in 60-90 DEG C, obtains polyurethane solutions (PU)；
The dimethyl formamide solution of silver nitrate is added into polyurethane solutions, film forming after stirring is heat-treated,
Produce polyurethane-nano silver film；
(2) preparation of chain alkyl diazomethane
4,4 '-dihydroxy benaophenonel and Dodecyl Bromide are reacted, 4,4 '-bis--dodecyloxy benzophenones are obtained；
4,4 '-bis--dodecyloxy benzophenones obtain 4,4 '-bis--dodecyloxy benzophenones hydrazone with hydration hydrazine reaction；4,4 '-bis--
Dodecyloxy benzophenones hydrazone is oxidized to react to obtain chain alkyl diazomethane；
(3) preparation of polyurethane-nano silver long-acting antibacterial film
Chain alkyl diazomethane is dissolved in solvent, polyurethane-nano silver film surface is uniformly coated to, through ultraviolet light
1-30min is irradiated, polyurethane-nano silver long-acting antibacterial film is produced.
, according to the invention it is preferred to, the diisocyanate described in step (1) is 4, the isocyanide of 4 '-dicyclohexyl methyl hydride two
Acid esters, described crosslinking agent is trimethylolpropane, and described chain extender is 1,6- hexylene glycols, and described catalyst is silicon in February
Sour dibutyl tin；
It is preferred that, diisocyanate, PolyTHF, crosslinking agent, chain extender, the quality of dihydromethyl propionic acid and catalyst
Than for 1：(0.8-1.2)：(0.01-0.1)：(0.1-1)：(0.01-0.1)：(0.001-0.01)；
It is preferred that, crosslinking agent and chain extender are dissolved in acetone soln add reaction system respectively, crosslinking agent and chain extender
In acetone soln, the ratio between volume of quality and acetone of crosslinking agent or chain extender is 1：(5-100)g/mL.
, according to the invention it is preferred to, the addition of silver nitrate is the 1-20% of polyurethane solutions quality, nitre in step (1)
The ratio between the quality of silver nitrate and the volume of dimethylformamide are 1 in the dimethyl formamide solution of sour silver：(1-10)g/mL：
It is preferred that, the temperature range being heat-treated after film forming is 25-200 DEG C, and the time of heat treatment is 1-10h.
, according to the invention it is preferred to, the long-chain alkyl halide described in step (2) is Dodecyl Bromide；
It is preferred that, 4, the mass ratio of 4 '-dihydroxy benaophenonel and long-chain alkyl halide is 1：(2-20)；
It is preferred that, reaction temperature is 80-200 DEG C, and the reaction time is 10-100h；
4,4 '-dihydroxy benaophenonel after the reaction of long-chain alkyl halide with generating hydrogen chloride, it is preferred that adding potassium carbonate is used for
Hydrogen chloride is neutralized, accelerates reaction rate.The mass ratio of 4,4 '-dihydroxy benaophenonel and potassium carbonate is 1：(2-20).
, according to the invention it is preferred to, 4,4 ' in step (2)-quality of bis--long-chain alkoxy base benzophenone and hydrazine hydrate
Volume ratio is 1：(1-10)g/mL；
It is preferred that, using ethanol as solvent in the course of reaction of 4,4 '-bis--long-chain alkoxy base benzophenone and hydrazine hydrate, second
Acid is catalyst, and 10-100h is reacted in 70-100 DEG C；It is further preferred that 4, the matter of 4 '-bis--long-chain alkoxy base benzophenone
Amount and the volume of ethanol are prepared as 1：(10-100), the quality and the volume ratio of acetic acid of 4,4 '-bis--long-chain alkoxy base benzophenone
For 1：(0.05-0.5)g/mL.
, according to the invention it is preferred to, 4,4 ' in step (2)-oxidation reaction process of bis--long-chain alkoxy base Benzophenonehydrazones
The middle oxidant that uses is that manganese dioxide, water absorbing agent are that anhydrous sodium sulfate, alkali are potassium hydroxide.
It is preferred that, 4,4 '-bis--long-chain alkoxy base Benzophenonehydrazones, manganese dioxide, the matter of anhydrous sodium sulfate and potassium hydroxide
Amount is than being 1：(0.2-2)：(0.25-1)：(0.01-0.1)；
It is preferred that, lucifuge is reacted in course of reaction, and reaction temperature is -40-40 DEG C, and the reaction time is 1-10h.
, according to the invention it is preferred to, ultraviolet ray intensity is 500-3000mW/cm in step (3)2, the ultraviolet light time
For 1-30min.
The principle of the present invention：
The present invention separately wards off new footpath, and table is carried out to the polyurethane-nano silver material being molded with chain alkyl diazomethane
Face is modified, and makes one layer of hydrophobic grouping of its surface uniform fold, forms the barrier of Nano Silver and hydrone, suppresses hydrone with receiving
Rice silver contact, so as to assign polyurethane-nano silver material long acting antibiotic property.Because the preparation of existing hydrophobic polyurethane is difficult
Degree is big, therefore the present invention will expand the application field of polyurethane antibiotic material.
The present invention chain alkyl diazomethane high activity Cabbeen can be generated after ultraviolet light, then rapidly with poly- ammonia
The carboxyl on ester-nano silver film surface is reacted, and occurs intercalation reaction with the c h bond of polyurethane chain, and chain alkyl is repaiied
Polyurethane surface is adornd, makes its surface that there is hydrophobicity.
The principle of the synthesis and the modification of polyurethane-nano silver film of chain alkyl diazomethane of the present invention is as follows：
Beneficial effects of the present invention are as follows：
1st, the present invention adds silver nitrate during polyurethane is standby, because polyurethane and silver nitrate are all the shapes with solution
Formula is present, and silver nitrate is reduced into Nano Silver in follow-up heat treatment process so that Nano Silver is uniformly dispersed, the polyurethane of macromolecular
Chain also limit the reunion of Nano Silver.
2nd, the present invention is by first preparing polyurethane-nano silver film, then utilizes the c h bond of macromolecular chain itself and aqueous
The carboxyl that polyurethane is carried realizes the hydrophobic surface modification of polyurethane material.It need not introduce high in polyurethane molecular in advance
Active reactive group, simplifies course of reaction, while avoiding the problem of hydrophobic polyurethane synthesis difficulty is big.
3rd, polyurethane produced by the present invention-nano silver long-acting antibacterial film has good antimicrobial long-acting, by modification
The Ag in film afterwards+Rate of release in aqueous is slack-off.Pass through polyurethane-nano silver long-acting antibacterial film aqueous dispersion
Electrical conductivity is tested, 48h electrical conductivity increase only 110%, and conventional polyurethanes-nanometer silver antimicrobial film 48h electrical conductivity increases reach
220%.Illustrate that the polyurethane antibiotic film of the present invention has reached the effect of long acting antibiotic.
4th, polyurethane produced by the present invention-nano silver long-acting antibacterial film has good anti-microbial property, by large intestine
Bacillus, the anti-microbial property test of staphylococcus aureus, the inhibition zone of polyurethane-nano silver long-acting antibacterial film of the invention are straight
Footpath and conventional polyurethanes antibacterial film antibacterial circle diameter are similar.
Brief description of the drawings
Fig. 1 is the stereoscan photograph of the polyurethane film without Nano Silver in test example 3.
Fig. 2 is the stereoscan photograph of polyurethane-nano silver film in test example 3.
Fig. 3 is the stereoscan photograph of polyurethane-nano silver film in comparative example 1.
Embodiment
Below by specific embodiment, the present invention will be further described, but not limited to this.
In embodiment it is raw materials used unless otherwise specified, be conventional commercial products.
Embodiment 1-3
The method that method prepares polyurethane-nano silver long-acting antibacterial film is modified after a kind of ultraviolet light, including step is such as
Under：
(1) preparation of polyurethane-nano silver film
4,4 '-dicyclohexyl methyl hydride diisocyanate (7.5g) and poly- tetrahydrochysene furan are added in 100mL there-necked flask
Mutter (7.9g), carries out prepolymerization within 2 hours with stirring at 90 DEG C of digital display electric mixer constant temperature, after completion of the reaction drops temperature
To 70 DEG C；Trimethylolpropane (0.178g), 1,6-HD (2.21g) are dissolved in acetone (15mL) and three-necked flask is poured into
In, dihydromethyl propionic acid (0.180g) is added afterwards, dibutyl tin dilaurate 3 is dripped, temperature rises to 80 DEG C and continues to react 3h.So
Afterwards, by mass percent be respectively 1% (embodiment 1), 5% (embodiment 2), 10% (embodiment 3) silver nitrate solid be dissolved in
Dimethylformamide (5mL), then be added portionwise with dropper in polyurethane solutions, continue to stir 30min at room temperature.Mixed solution
Equably pour into Teflon mould, be heat-treated in electric drying oven with forced convection.The process of heat treatment is followed successively by：25
℃(50min)→120℃(80min)→160℃(130min)→180℃(10min).The ratio of each raw material used such as table 1
It is shown.
The formula of the PU films of the different material ratio of table 1
(2) synthesis of chain alkyl diazomethane
1. the synthesis of 4,4 '-bis--dodecyloxy benzophenones
The addition dimethylformamide (30mL) in single-necked flask, 4,4 '-dihydroxy benaophenonel (2.14g,
0.01mol), Dodecyl Bromide (5g, 0.02mol), potassium carbonate (6.9g, 0.05mol), 24h is reacted at 80 DEG C, is then returned
Stream stirring 24h, is cooled to room temperature, obtains White Flocculus solid, 12h is dried in vacuum drying chamber after completion of the reaction.
Yield:70%；1H-NMR：0.878(t,3H,-CH2CH3),1.238(m,2H,-CH2-CH2),1.465(m,2H,O-CH2-
CH2-CH 2), 1.789 (m, 2H, O-CH2 CH 2),4.040(t,2H,O-CH 2),6.962(d,1H,ph-H),7.794(d,1H,ph-
H)；13C-NMR(50MHz,CDCl3):193.8(1C,CO)161.9,131.6,130.1,113.4(4C,C-ph),67.8(1C,
O-CH2),31.3,29.1,28.8,25.5(4C,-CH2),22.1(1C,-CH2CH3),13.5(1C,-CH2 CH3)；IR(KBr,
cm-1):3398.57,2954.95,2850.79,1633.71,1602.85,1309.67,1253.73.
2. the synthesis of 4,4 '-bis--dodecyloxy benzophenones hydrazone
The reacted solid of the first step (1.39g, 2.53mmol) is dissolved in 20mL ethanol, 100mL single port is poured into
In bottle, hydrazine hydrate (2.45mL, 50.6mmol) is added, a few drop glacial acetic acids (0.4mL) is added as catalyst, is heated to 80 DEG C
Return stirring 48h, is after completion of the reaction evaporated ethanol, is then dissolved in dichloromethane (60mL), with distilled water (60mL)
Washing 4 times, adds anhydrous magnesium sulfate and dries organic layer, revolving obtains faint yellow solid, and 24h is dried in vacuum drying chamber.
Yield:75%；1H-NMR：0.88(t,3H,-CH2-CH 3),1.277(m,2H,-CH 2CH3),1.453(m,2H,O-CH 2),
1.754(m,2H,O-CH2-CH 2),4.06(t,2H,O-CH2), 7.0 (s, 2H, C=N-NH2),7.405,7.248,7.023,
6.837(d,1H,ph-H)；12C-NMR：158.9 (1C, C=N), 161.9,130.9,124.4,114.6 (4C, C-ph), 67.7
(1C,O-CH2),31.4(1C,-CH2-CH2-CH3),29.1(4C,-CH2),25.6(1C,O-CH2-CH2-CH2),13.6(1C,-
CH2-CH3).IR(KBr:cm-1):3471.86,2954.95,2850.79,1604.71,1508.33,1247.94.
3. the synthesis of 4,4 '-bis--dodecyloxy diazomethane
Second step product (1.015g, 1.8mmol) is dissolved in dichloromethane (15mL), addition manganese dioxide (0.57g,
6.51mmol), anhydrous sodium sulfate (0.50g, 3.50mmol), potassium hydroxide (0.15g, 2.75mmol), lucifuge is stirred at room temperature
2h is mixed, after completion of the reaction suction filtration, organic layer will obtain violet solid after revolving.Yield:50%；1H-NMR：0.89(t,
3H,-CH2-CH 3),1.26(m,2H,-CH 2),1.29(m,2H,-CH2),1.43(m,2H,O-CH2-CH2-CH 2),1.77(m,
2H,O-CH2-CH 2),3.97(t,2H,O-CH 2),6.95(d,1H,ph-H),7.19(d,1H,ph-H)。13C-NMR：156.8,
126.0,120.8,114.9(4C,C-ph),67.7(1C,O-CH2),31.4(1C,-CH2-CH2-CH3),29.1(4C,-CH2),
25.6(1C,O-CH2-CH2-CH2),13.6(1C,-CH2CH3).IR(KBr:cm-1):3361.93,2918.30,2852.72,
2059.71,1510.26,1473.62,1249.87,1024.20.
(3) surface modification of polyurethane-nano silver film
Polyurethane-nano silver film that first step (1) is prepared is cut into 2 × 2cm blockage.Then ultraviolet light is used
Irradiation carries out surface modification to film：
Uv irradiation method：The hexamethylene that will be dissolved in first on 4,4 '-bis--dodecyloxy diazomethane (0.1g)
In (15mL), then solution dripped to the surface of film with glue head dropper, after solvent volatilization is clean, by film ultraviolet lighting
30min is penetrated, the intensity of ultraviolet light is 500mW/cm2；It is cooled to after room temperature and rinses film with hexamethylene, produces.
Embodiment 4
As described in Example 1, unlike：
Prepolymerization temperature is 100 DEG C in step (1), is added anti-after dihydromethyl propionic acid and dibutyl tin dilaurate
It is 70 DEG C to answer temperature；
The intensity of ultraviolet light is 1500mW/cm in step (3)2。
Embodiment 5
As described in Example 1, unlike：
Diisocyanate in step (1), PolyTHF, crosslinking agent, chain extender, the matter of dihydromethyl propionic acid and catalyst
Amount is than being 1：1.1：0.024：0.28：0.02：0.003.
Comparative example 1
1. 4,4 '-dicyclohexyl methyl hydride diisocyanate (7.5g) and poly- tetrahydrochysene are added in 100mL there-necked flask
Furans (7.9g), carries out prepolymerization in 2 hours, after completion of the reaction by temperature with stirring at 90 DEG C of digital display electric mixer constant temperature
It is down to 70 DEG C；Trimethylolpropane (0.178g), 1,6-HD (2.21g) are dissolved in acetone (15mL) and three mouthfuls of burnings are poured into
In bottle, dihydromethyl propionic acid (0.180g) is added afterwards, dibutyl tin dilaurate 3 is dripped, temperature rises to 80 DEG C and continues to react 3h,
Obtain polyurethane solutions.
2. polyvinylpyrrolidone (10.5g) is added in ethylene glycol (49.8mL) and is heated to 60 DEG C, stirring makes poly- second
Alkene pyrrolidone all dissolves, and then adds AgNO3(1.5g), is warming up to 120 DEG C of continuation stirring reaction 1.5h, after the completion of reaction
Room temperature is cooled to, silver nanoparticle solution is produced.
3. the nanoparticles solution 10mL as described in 2. is taken, is added in the polyurethane solutions as described in 1., at room temperature
Stir 0.5h.Then, mixed solution is equably poured into Teflon mould, entered in 50 DEG C of electric drying oven with forced convection
Row drying, obtains polyurethane-Nano Silver contrast film, and electromicroscopic photograph is as shown in Figure 3.
Test example 1, antibacterial experiment
The preparation of culture medium：Peptone (3.5g), NaCl (1.75g), dusty yeast (1.75g), agar powder (3g) is weighed to put
Enter in conical flask, add distilled water (350mL) dissolving.PH value is adjusted to 7.2 or so, autoclaving with the NaOH aqueous solution (1M)
30min (121 DEG C, 1.41MPa), then constant temperature cultivates 12h in 60 DEG C in electro-heating standing-temperature cultivator, in order to topple over.
Antibacterial experiment：Escherichia coli or staphylococcus aureus (2mL) are inoculated on culture medium solution first, then will
Culture medium pours into sterile petri dish.After after culture medium cooled and solidified, by a diameter of 1.2mm polyurethane-nano silver film disk
It is put on culture medium, the diameter that inhibition zone is measured after 24h is cultivated in incubator.
After polyurethane-nano silver film of different silver contents is modified through uv irradiation method in this test example, test pair
Escherichia coli, the anti-microbial property of staphylococcus aureus, and contrasted with the film before modification, as a result as shown in table 2.
As can be seen from Table 2：
A. the antibacterial circle diameter of polyurethane film does not change, and illustrates the film without antibiotic property.
B. the diameter increase of the inhibition zone of polyurethane-nano silver film, illustrates that the film has antibiotic property.
C. with the increase of silver nitrate content, the diameter of the inhibition zone of polyurethane-nano silver film also increases, and illustrates nitric acid
Silver content is bigger, and the anti-microbial property of polyurethane-nano silver film is better.
D. antibacterial circle diameter size of the polyurethane-nano silver film before and after ultraviolet light is modified is similar.
The antibacterial experiment data of 2 polyurethane of table-nano silver film
Test example 2, Experiment of Electrical Conductivity
It is that polyurethane-nano silver film that chain alkyl is modified is placed in distilled water (30mL) by surface, it is permanent at 25 DEG C
Temperature stirring, every when determine the aqueous solution electrical conductivity.
In order to observe after polyurethane-nano silver film surface modification, whether rate of release of the silver ion in water slows down,
Whether there is long acting antibiotic property, have studied polyurethane-nano silver film conductance in aqueous that silver content is 10%
The change of rate.The test data of electrical conductivity is as shown in table 3.
The silver content of table 3 is the conductivity data of 10% polyurethane-nano silver film
The as shown by data of table 3, when silver content is 10%, the electrical conductivity size of film compare for：Unmodified polyurethane
Film<Polyurethane-nano silver film of uv irradiation method modification.Therefore, the Ag in the film after modification+In the aqueous solution
In rate of release it is slack-off, that is, reached the effect of long acting antibiotic.
The surface topography of test example 3, polyurethane-nano silver film
Fig. 1 is the stereoscan photograph of the polyurethane film without Nano Silver, and Fig. 2 is polyurethane-Nano Silver of test example 3
The stereoscan photograph of film, Fig. 3 is the stereoscan photograph of polyurethane-nano silver film of comparative example 1.Due to the reduction of silver
Low (the E of current potential0=0.8V), thus silver nitrate can just be reduced to Ag simple substance in heating.Found by comparison diagram 1,2, work as nothing
During Nano Silver, film surface is without any material；When silver content is 10%, there are substantial amounts of nano-Ag particles inside film, this says
Nano Silver has been reduced into after the nitric acid galactic longitude ultraviolet light of bright addition.
By comparison diagram 2,3 find, when silver nitrate in the gap of polyurethane chain by in-situ reducing into Nano Silver when, poly- ammonia
The macromolecular chain of ester limits the reunion of Nano Silver, obtains dispersed nano-silver particles more uniform；And Nano Silver and polyurethane
During blending (comparative example 1), Nano Silver disperses less uniform in polyurethane system, there is more serious agglomeration.
Claims (10)
1. the method that method prepares polyurethane-nano silver long-acting antibacterial film is modified after a kind of ultraviolet light, including step is as follows：
(1) preparation of polyurethane-nano silver film
Diisocyanate and PolyTHF are mixed, 1-10h is reacted in 80-120 DEG C；Crosslinking agent, chain extender are added, is added
Dihydromethyl propionic acid and catalyst, react 1-10h in 60-90 DEG C, obtain polyurethane solutions (PU)；
The dimethyl formamide solution of silver nitrate, film forming after stirring are added into polyurethane solutions, then is heat-treated, i.e.,
Obtain polyurethane-nano silver film；
(2) preparation of chain alkyl diazomethane
4,4 '-dihydroxy benaophenonel and Dodecyl Bromide are reacted, 4,4 '-bis--dodecyloxy benzophenones are obtained；4,
4 '-bis--dodecyloxy benzophenones obtain 4,4 '-bis--dodecyloxy benzophenones hydrazone with hydration hydrazine reaction；4,4 '-bis--ten
Dialkoxy-benzophenones hydrazone is oxidized to react to obtain chain alkyl diazomethane；
(3) preparation of polyurethane-nano silver long-acting antibacterial film
Chain alkyl diazomethane is dissolved in solvent, polyurethane-nano silver film surface is uniformly coated to, through ultraviolet light
1-30min, produces polyurethane-nano silver long-acting antibacterial film.
2. the side that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light according to claim 1
Method, it is characterised in that the diisocyanate described in step (1) is 4,4 '-dicyclohexyl methyl hydride diisocyanate, described friendship
Connection agent is trimethylolpropane, and described chain extender is 1,6- hexylene glycols, and described catalyst is dibutyl tin dilaurate.
3. the side that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light according to claim 1
Method, it is characterised in that diisocyanate, PolyTHF, crosslinking agent, chain extender, dihydromethyl propionic acid and catalysis in step (1)
The mass ratio of agent is 1：(0.8-1.2)：(0.01-0.1)：(0.1-1)：(0.01-0.1)：(0.001-0.01)；
It is preferred that, crosslinking agent and chain extender are dissolved in acetone soln add reaction system respectively, the acetone of crosslinking agent and chain extender
In solution, the ratio between volume of quality and acetone of crosslinking agent or chain extender is 1：(5-100)g/mL.
4. the side that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light according to claim 1
Method, it is characterised in that the addition of silver nitrate is the 1-20% of polyurethane solutions quality, the dimethyl of silver nitrate in step (1)
The ratio between the quality of silver nitrate and the volume of dimethylformamide are 1 in formamide solution：(1-10)g/mL.
5. the side that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light according to claim 1
Method, it is characterised in that the long-chain alkyl halide described in step (2) is Dodecyl Bromide.
6. the side that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light according to claim 1
The mass ratio of method, it is characterised in that 4 in step (2), 4 '-dihydroxy benaophenonel and long-chain alkyl halide is 1：(2-20)；
It is preferred that, reaction temperature is 80-200 DEG C, and the reaction time is 10-100h.
7. the side that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light according to claim 1
Method, it is characterised in that 4,4 ' in step (2)-volume ratio of the quality of bis--long-chain alkoxy base benzophenone and hydrazine hydrate is 1：
(1-10)g/mL。
8. the side that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light according to claim 1
Method, it is characterised in that 4,4 ' in step (2)-course of reaction of bis--long-chain alkoxy base benzophenone and hydrazine hydrate in using ethanol as
Solvent, acetic acid is catalyst, and 10-100h is reacted in 70-100 DEG C；
It is preferred that, 4,4 '-bis--quality of long-chain alkoxy base benzophenone and the volume of ethanol are prepared as 1：(10-100), 4,4 '-
The quality of double-long-chain alkoxy base benzophenone and the volume ratio of acetic acid are 1：(0.05-0.5)g/mL.
9. the side that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light according to claim 1
Method, it is characterised in that 4,4 ' in step (2)-oxidation reaction process of bis--long-chain alkoxy base Benzophenonehydrazones in the oxidation that uses
Agent is that manganese dioxide, water absorbing agent are that anhydrous sodium sulfate, alkali are potassium hydroxide；
It is preferred that, 4,4 '-bis--long-chain alkoxy base Benzophenonehydrazones, manganese dioxide, the mass ratio of anhydrous sodium sulfate and potassium hydroxide
For 1：(0.2-2)：(0.25-1)：(0.01-0.1)；
It is preferred that, lucifuge is reacted in course of reaction, and reaction temperature is -40-40 DEG C, and the reaction time is 1-10h.
10. the side that method prepares polyurethane-nano silver long-acting antibacterial film is modified after ultraviolet light according to claim 1
Method, it is characterised in that ultraviolet ray intensity is 500-3000mW/cm in step (3)2, the ultraviolet light time is 1-30min.
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| CN113582829A (en) * | 2021-08-04 | 2021-11-02 | 武汉大学 | Benzophenone-based flexible room-temperature phosphorescent crystal, and preparation method and application thereof |
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