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8/22/2019 Fgf Presentation

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STAINREMOVAL/REPELLENCY

SHAILENDRA TIWARI

SURYA PRATAP

WATAN CHUGH

DFT SEM 4


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REPELLENT FINISHES

Finishes that repel water, oil, dry

dirt, are important parts of textile

market.

Water repellency is achieved using

different product groups.

Oil repellency is attained only withfluorocarbon polymers.


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REPELLENT FINISHES

The oldest repellant finish is to repelwater.

Apart from desired repellency finish

other undesirable effects are alsofound with such finishes.

These include:

Static electricity

Stiffer Fabric hand Lack of air and vapor Permeability

Increased Inflammability

Durapress finish etc.


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REPELLANCY PRINCIPLE

Adhesive energy.

Cohesive energy.

Wet-ability depends on the interaction of above mentioned forces atthe fabric and liquid surface interaction.

Surfaces that exhibit low interactions with liquids are called lowenergy surfaces.


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MODES OFAPPLICATION

CHEMICALREACTION E.G.

FATTY ACIDSAND RESINS

FILM FORMATIONE.G. SILICONES

ANDFLOUROCARBON

PRODUCT

MECHANICALE.G. PARAFFIN

EMULSION


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TYPES OFFINISHES


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STAINREPELLENCY

FINISHES

OILREPELLENCY

SOILRELEASE

WATERREPELLENCY


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WATER REPELLENT FINISHING

waterproof and water-repellent fabrics, materialstreated with various substances so as to make themimpervious to water.

Permanent waterproofing is achieved by first coatingfabrics with rubber or plasticized synthetic resins, thenvulcanizing or baking them.

Fabrics so treated lose porosity and lightness andwhen rubberized are subject to cracking.


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Water-repellent fabrics, sprayed with orimmersed in synthetic resins, metalliccompounds, oils, or waxes, tend toremain porous and to retain their natural

characteristics. Earlier treatments, such as tarring the

surface (as for tarpaulin) or oiling (as foroilskin), have been supplemented byhighly technical and varied processes

and by the method of coating the fibresprior to cloth construction.

Some woollen fabrics, especially Navajoblankets and tweeds and other nappedtextiles, are naturally water repellent.

A water repellent finish should withstandhydrostatic pressure exerted by acolumn of water from at least 1 meterheight before it wets the fabric.


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Oil Repellency

Both Oil and water repellency have same principleinvolved.

Depends on free surface energy.

Only Fluorocarbon (FCP) are the only class ofchemicals, which impart both water and oilrepellence.


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FCP

Fluorocarbon polymers are special class of polymersand represent an indispensable part of thetechnology of water and oil repellent finishing andcontain Carbon and Fluorine bonds.

The relatively low reactivity and high polarity of thecarbon- fluorine imparts unique characteristics tofluorocarbon polymers.

A fluropolymer sheath around the fibres stronglyreduces the textiles surface free energy,

accompanied by the increase of the contact angle ofliquids on its surface.

FCP are applied by the normal pad dry- curetechnique.


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SAMPLE TREATED WITH FCP


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Soil Release

Soiling generally means smearing or staining of a largesurface of the fabric with dust or dirt and oil or grease orboth.

Soil Repellent finishes should protect the fabric fromboth dry and wet soils.

Fabrics treated with soil release finishes are particularlysuited to active wear and leisure wear.

Natural fibres and synthetic fibres both attract dirt andget soiled but synthetic fibres attract soil to a graterextent than natural fibres apart from this, they do not

release soil easily during washing.

Due to absorption and retention of soil, the whitenessand brightness of a fabric is spoiled and it appearsyellowish and dirty.


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Mechanismof soiling

Mechanicaladhesion ofsoil to the

cloth

Adhesion byelectrical

forces

Redepositionof soil during

washing


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A soil release finish does not prevent soil fromentering the fabric but it simply allows it toleave faster.

It removes soil from the fabric and transfers itto the detergent; it protects the fibre fromattack by soiling matter; it preventsredeposition of soil which has been dissolvedor dispersed and lastly it prevents dust frombeing attracted and held by electricalcharges on the fabric surface.

There are two types of soil release treatmentsavailable

1. Oleo phobic treatments2. Treatment with hydrophilic substances


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FINISHING AGENTS USED

FLUOROCARBONS

FLUOROCHEMICALS PYRIDINUM COMPOUNDS RESINS SILICONE WAX AND ITS DERIVATIVES

Stain resistant fabric technology provides permanentstain repellence and stain release properties.

Not only does this fabric repel stains, but it alsoreleases the dirt and oils that cause stains. It helpsgarments stay cleaner, longer.


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THANK YOUU !!

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