Download - 28008034 Anti Microbial and Hygiene Finishes
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Action in textile industry
Prevent biodegradation of chemical.
Inhibit bacterial activity on textile.
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The need for antimicrobial finishing
Result of microbialattack on textile
Odour formation Contaminant risk
Quality lossStrength reduction
Effect on consumer
Effect on fabric
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Requirement for antimicrobial finish
Durability to washing, dry cleaning and hot-pressing
Selective activity to undesirable micro-organism
Not produce harmful to manufacturer, user and
the environment
Comply with the requirement of regulatingagencies.
Compatibility with the chemical process
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Mechanism of Antimicrobial activity
-cidal, -cidedestruction of microbes.
-staticinhibition of microbial growth.
Antimicrobial finish
a) Hygienic finish on Clothing and textileb) Antimicrobial finish on Technical textile
AntibacterialBactericide Bacteriostatic
Deodorising
Antimycotic
Fungicide
Fungistatic
Germicide
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Bacteriostatic and Bacteriocidal
log cellnumber
log cellnumber
time
time
Bacteriostatic Bacteriocidal
Viable cell count
Total cell count
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Typical antimicrobial agent
Metal and metal saltsdeactivation of
protien
Quaternary ammonium saltsmembranedamage
N-Halamineoxidative properties
Others : organic molecule (Triclosan),natural substance (chitosan)
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Chemistry of antimicrobial finishes
Controlled release antimicrobicals.
Bound antimicrobials.
Renewable bound antimicrobials.
(N-halamine)
Chitosan
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Migrating and non-migrating
technology
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Controlled release technique.
Protection of the activecore fromexternal.
Control-release of the
active core by:
Diffusion via polymer
structure
Rupture of polymer wall
Bioerosion of polymer
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Control release system :
Microcapsule: active agent form a core surround by an
inert diffusion barrier.
Microsphere: active agent is dispersed or dissolved in
an inert polymer.
Cyclic molecules: active agent is entrapped in thecavity of cyclic molecule (e.g. cyclodextrins)
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Controlled release antimicrobicals.
Triclosan is most widelyused.
Good antibacterial but
poor antifungal. Low water solubility,
required dispersing agentand binder.
Microencapsulation is anovel technique for thistype.
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Controlled release antimicrobicals.
Organo-silver compounds and silver
zeolites are promising candidates for
textile finishes. Nano-silver and Nano-titanium have a very
low toxicity profile and excellent heat
stability.
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Bound antimicrobials
(a) is most widely used but cancause allergic especially whenuse with product for feet.
(b) is also used in modernprocess can be used for odour-free sock.
Performance can be improvedby wet-on-wet padding withanionic fixing agents.
No elevated curingtemperature is required.
Used by exhaustion or continuous.
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Schematic of action :Octadecylaminodimethyltrimethoxsilylpropyl
ammonium chloride
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Renewable bound antimicrobials.
(N-halamines)
Continued treatment
with hypochlorite and
can be renewable. More yellowing on
CEL.
CEL fiber damage
due to hypochlorous
acid.
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Schematic of N-halamine action.
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Antimicrobial activity test
The agar plate test : Standard method SNV 195920-
1992
Shake flask method : Standard method ASTM E2149-01
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Micrograph of treated and
untreated fabric (20x)
Antimicrobial Agent, applied to fiber
(magnified 20 times), prevents formation
of microorganisms that cause odor and
discoloration.
Untreated fiber reveals an unpleasant
breeding ground for fungi and bacteria
which cause odor problems and
deterioration.
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Commercial antimicrobial textile
product :
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Troubleshooting for antimicrobial
finishes
:
Antimicrobial finishes are excluded from the
Oeko-Tex Standard 100 label, If residual finish is
improperly disposed of at the finishing plant. Formulation should balance between high
biocide activity and the requirements of safe
handling, including non-toxicity to humans at
usual concentrations and environmentaldemands.
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Conclusion :
Hygiene application is principally applied
with antimicrobial.
Antimicrobial should active on wide rangemicroorganism.
Do not interfere with skin bacteria.
Should not contain toxic migratingsubstance.
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