Summary of the invention
Primary technical problem to be solved by this invention is the expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material that possesses bacteriostasis that provides at above-mentioned prior art present situation, it not only has the various performances of general expanded PTFE coated filter material, the function that also possesses antibacterial sterilization, be particularly suitable for the filtering material of the air-conditioning of the more public place of various thalline such as hospital and ventilation filter, clean room filter device etc., use very convenient simple.
Another technical problem to be solved by this invention is the production method of the expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material that possesses bacteriostasis that provides at above-mentioned prior art present situation, and its technology advantages of simple is made easily.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material, it includes base cloth, eptfe membrane, base cloth is laminated with together mutually by adhesive linkage and eptfe membrane, it is characterized in that base cloth handles through bacteriostatic agent, bacteriostatic agent is spread upon on the base cloth by 2~15% (wt) of base cloth weight; Or the bonding agent in the adhesive linkage contains bacteriostatic agent, by 2~15% (wt) of bonding agent weight bacteriostatic agent is added in the bonding agent.
Expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material is meant the new type functional filtrate that can effectively kill with bacteria growing inhibiting and breeding.Antifungal mechanism and process: the bacteriostatic agent that the present invention uses is inorganic bacteriostatic agent, the inorganic ions bacteriostatic agent adopts the method for physical absorption ion-exchange mostly, with silver, copper, metal ions such as zinc are carried on porous material surface, metal ion is when contacting with bacterium, metal ion can slowly release, combine with bacterial cell membrane and memebrane protein, destroy its structure, enter the enzyme that destroys electron transport system behind the cell and with the DNA reaction, after thalline is killed, metal ion dissociates out again, contact with other bacterium colonies, carry out a new round and kill, go round and begin again, utilize this bacteriostasis of metal ion, reach the long-acting bacteriostatic purpose by slow releasing function.The present invention adopts inorganic bacteriostatic agent, compare with organic bacteriostatic agent commonly used, have anti-higher temperature, higher-security, higher long-acting bactericidal effect, can be scattered in water and organic solvent, can stand the processing temperature of thermoplastic material up to 350 ℃, its powder granularity is evenly distributed and the specially treated of powder surface process, makes it good compatibility, uniformly dispersed be arranged with multiple fiber and plastics, and drawing abillity and other application performance are not had influence.This series bacteriostatic agent is water-fast, acid and alkali-resistance, wash resistant, and illumination is aging, and resistance is difficult for producing.Almost all bacterial classifications (bacterium, fungi, yeast, mould, algae etc.) all there is the extremely strong ability of killing.Inorganic bacteriostatic agent generally has two kinds of liquid and powders, handles by different base cloths that each takes what he needs.Bacteriostatic agent can be selected bacteriostatic agent or their compounds of silver oxide, cupric oxide or zinc oxide series for use, and can contain an amount of coupling agent, dispersant and other auxiliary agent.
Liquid: outward appearance is light yellow, effective solid content: 28~30%, and viscosity: 13s, pH value 6~8.
Powder: outward appearance is the puffy powder of ivory buff, average grain diameter<100nm, and apparent density can be by 0.1g/cm
3To 1.0g/cm
3
Described eptfe membrane is the e-PTFE film.
Described base cloth is selected all kinds of fiber cloth or the nonwoven of terylene, polypropylene fibre, sticking fibre, cotton, hair and mixed textile thing thereof for use.
Described bonding agent is selected bonding agents such as epoxy resin or polyurethane for use.
Described solvent is selected butanone, acetone, ethyl acetate or their mixed solvent for use.
The present invention solves the technical scheme that above-mentioned another technical problem adopts: a kind of production method of expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material is characterized in that steps in sequence is:
(1) the antibacterial processing of base cloth: the liquid bacteriostatic agent is adopted methods such as padding method, infusion process, gunite, coating or brushing method, by 2~15% (wt) of base cloth weight bacteriostatic agent is evenly spread upon on the base cloth, then through oven for drying;
(2) bonding agent preparation: solubilizer in bonding agent through stirring, is configured to the solution for standby of 10~20% (wt);
(3) complex method: Method for bonding, promptly use gunite, coating or brushing method that the bonding agent that configures is coated in equably on the base cloth of antibacterial processing, be covered with eptfe membrane, heat baking on forming machine then, through the chill roll cooling, make expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material again.Or heat seal, promptly the base cloth through antibacterial processing heats on hot-rolling, makes expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material after being covered with the eptfe membrane pressing.
Or a kind of production method of expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material is characterized in that steps in sequence is:
(1) bonding agent preparation: solubilizer in bonding agent, through stirring, be configured to the solution of 10~20% (wt), 2~15% the ratio of powder bacteriostatic agent in bonding agent weight progressively is added in the bonding agent, same through stirring, join to such an extent that antibacterial bonding agent is standby.
(2) complex method: with the preheating of base cloth elder generation, re-use the antibacterial bonding agent that gunite, coating or brushing method will configure and be coated in equably on the base cloth, be covered with eptfe membrane, heat baking on forming machine then, through the chill roll cooling, make expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material again.
Preferably, heat baking temperature is under 150~250 ℃ on the described forming machine, and heat is dried by the fire 5~10min; 100~200 ℃ of described heat roller temperatures, hot pressing 3~5min; Described chill roll cools off 5~10min down for 20~50 ℃ at chilling temperature.
Preferably, described preheating oven is at 50~80 ℃ of following preheating 3~8min of temperature.
In a word, as long as in the scope that material allows, heat baking temperature/time, heat roller temperature/hot pressing time, chilling temperature/time, preheat temperature/time there is not strict restriction.
Compared with prior art, the invention has the advantages that: it not only has the various performances of general expanded PTFE coated filter material, the function that also possesses antibacterial sterilization, be particularly suitable for the filtering material of the air-conditioning of the more public place of various thalline such as hospital and ventilation filter, clean room filter device etc., use very convenient simple, production method technology advantages of simple is made easily.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Examples of implementation 1
Use the liquid bacteriostatic agent
(1) the antibacterial processing of base cloth: the liquid bacteriostatic agent is adopted methods such as padding method, infusion process, gunite, coating, brushing method, evenly spread upon on the base cloth by 2~15% of base cloth weight bacteriostatic agent, the Different Weight base cloth is in proportion with bacteriostatic agent, again through oven for drying.
(2) bonding agent preparation: under 25 ℃ of constant temperature, solubilizer stirs 5~10min with the speed of 500~1000rpm in bonding agent, is configured to the solution for standby of 10~20% (wt).
(3) complex method, can use gunite, coating or brushing method that the bonding agent that configures is coated in equably on the base cloth of antibacterial processing, be covered with eptfe membrane, then can be by drying by the fire 5~10min on 150~250 ℃ of forming machines, through 20~50 ℃ of chill roll cooling 5~10min, make expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material again.Or, with the base cloth of antibacterial processing be covered with eptfe membrane through 100~200 ℃ of hot-rollings with 3~5min pressing, through 20~50 ℃ of chill rolls cooling 5~10min, make expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material again.
Concrete enforcement prescription and condition see the following form
Examples of implementation 2
Use the powder bacteriostatic agent
(1) bonding agent preparation: under 25 ℃ of constant temperature, solubilizer stirs with the speed of 500~1000rpm, be configured to the solution of 10~20% (wt), progressively be added in the adhesive in 2~15% ratio of bonding agent weight the powder bacteriostatic agent, same speed with 500~1000rpm, evenly stir 5~10min, join to such an extent that antibacterial bonding agent is standby.
(2) complex method: with base cloth preheating 3~8min in 50~80 ℃ of preheating ovens, re-using the antibacterial bonding agent that gunite, coating or brushing method will configure is coated on the base cloth equably, be covered with poly tetrafluoroethylene, on 150~250 ℃ of forming machines, dry by the fire 5~10min respectively then, through 20~50 ℃ of chill roll cooling 5~10min, make expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filter material again.Concrete prescription and implementation condition see the following form.
Among the present invention: base cloth refers to: each fibrid such as terylene, polypropylene fibre, sticking fine, cotton, hair and mixed textile thing thereof and nonwoven etc.Bonding agent refers to: bonding agents such as epoxy resin or polyurethane.Solvent refers to: butanone, acetone, ethyl acetate or their mixed solvent.
Expanded PTFE coated filter material after above-mentioned bacteriostatic agent is handled not only has the various performances of general expanded PTFE coated filter material, still can fold routinely and be made into filter, and the filter that makes also possesses the function of antibacterial sterilization.Antibacterial detection foundation and analytical method: JISZ 2801:2000, analyzing and testing result:
Test microbes |
Directly obtain bacterium number (cfu/ sheet) after the no processing sample sheet inoculation |
No processing sample sheet inoculation back is placed 24h and is obtained viable count (cfu/ sheet) |
Antibiotic coupons inoculation back is placed 24h and is obtained viable count (cfu/ sheet) |
The antibacterial activity value |
Bacteriostasis rate (%) |
ETEC (Escherichia coli) ATCC 8739 |
4.3X10
5 |
2.6X10
7 |
5.1X10
5 |
1.7 |
98 |
Expanded polytetrafluoroethylbacteriostatic bacteriostatic coated filtering material is antibacterial long-lasting: make hydroxyl in antimicrobial component and the fabric fibre molecule, amino, carboxyl etc. contain the radical reaction of active hydrogen by coupling agent, thereby make antibiotic composition and fiber strong bonded, bacteriostasis rate can reach more than 90%.