28008034 Anti Microbial and Hygiene Finishes

8/11/2019 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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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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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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Documents

28008034 Anti Microbial and Hygiene Finishes