Soil Release Finish

Principle     

·         Accumulation of soil and dust particles is known as ‘Soiling’.

·      To get rid of this soiling problem, the fabric cannot be made totally soil repellent or   soil resistant but a type of finish is given to the fabric, so that during washing, the   accumulated soil on the fabric can easily be removed from the fabric.

·         This type of finish is known as ‘Soil Release Finish’.

·      Also, the released soil particles should not get redeposit on the fabric during of after   washing.

Objectives

·         This type of finish is mainly given to synthetic fibres.

·     Blouse pieces and some ladies wear also soil release finished because of their easy   absorption of soil.

·        The deposition of soil will reduce the appearance and the real colour of the fabric. So,   it is essential to carry out soil release finish.

·        This is a chemical and property giving finish.

Requirements

·    It should not affect the fastness properties of dyed material and some other physical   properties such as strength, feel, drape etc.

·      It should be fast to light, wash and laundering.

Factors Governing Soiling

·         As the static charge increases, soiling increases.

·         As the moisture regain increases, soiling decreases.

·         As the temperature increases, soiling increases.

·         As the size of the soil particles increases, soiling decreases.

·         As the smoothness of surface increases, soiling decreases.

·         As the denier of the fabric increases, soiling decreases.

·         As the twist of the yarn increases, soiling decreases.

Methods of Bringing Soil Release Property

·         Mercerisation of cotton fabric.

·         Using film forming compounds like CMC, PVA, Starch.

·         Converting the fibre and making it hydrophilic.

·         Using metal oxides like silica alumina, BaSO₄, TiO₂.

·         Using Acrylic polymers with PE, PE glycols, PE emulsion etc.

·         Using silicone emulsions, these are widely used today.

Process for PET fibre

Method:- (1):- Take polyester and pad with a solution containing Polyethylene glycol and 

                       Sodium hydroxide. PAD – DRY Method.

Method:- (2):- Take 1 – 3 % concentrated of Cirrasol PT. Pad- DRY – CURE method.

Method:- (3):- Pad the Polyester yarn with 10 % of NaOH at 60°C for 10 minutes. PAD –

                       DRY Method.

Method:- (4) Pad the polyester with H₃PO₄. PAD – DRY Method.

Process for PET/Woollen blend fibre

·         Soil Release Agents (SRA) :- Migafor or Nonax

Recipe:-           SRA                                        -           50 parts

                        MgCl2.6H2O                          -             5 parts

                        Flourescent Brightener            -  10 – 40 parts 

PAD – DRY – CURE

·         Padding is done at an expression of 60 % followed by drying at a temperature of 70 – 90°C and then curing at 180 – 210°C for 20 seconds.

Process for Nylon fibre

                        Methoxy Methyl nylon           -           0.5 %

                        Catalyst                                   -           3 %

                        PAD – DRY - CURE