28010526 Textile Auxiliaries Surf Act Ant Auxiliaries

Application of Surfactant auxiliaries

Wirote Sarakarnkosol

Surfactant containing auxiliary

Wetting and Rewetting agent Scouring agent Emulsifying and Dispersing agent Levelling agent Defoaming agent

Wetting and Rewetting agent:

Wetting power of surfactant

Middle hydrophilic group surfactant gave higher wetting power than those of end.

Higher wetting power Lower wetting power

Wetting power of surfactant

Branch or aromatic hydrophobic chain is prefers.

Lower wetting power

Higher wetting power

or

Wetting power of surfactant

Optimum of EO in non-ionic surfactant unit gave maximum wetting power.

EO EO EOEOEO

EO EO EOEOEO EO EO EOEOEO

EO EO EO Low solubility : Lower wetting power

High water affinity :Lower wetting power

Optimum EO : Highest wetting power

pH of wetting agent application

pH Anionic wetting agent Nonionic wetting agent

Strongly alkaline

Easily soluble surfactants with relatively low MW are applicable. Those with ester linkage are hydrolyse

Not-applicable (insoluble)

Weakly alkaline Applicable Generally applicable

Nearly neutral Applicable Applicable

Weakly acidApplicable, Sulphate type surfactant are decomposed dependinf on conditions.

Applicable

Strongly acidGenerally not applicable. In some cases particular sulphonate type are applicable

Generally applicable

Mercerization, Causticization

General scouring, bleaching,dyeing (Vat, Sulphur)

Desizing, Dyeing (Direct, Reactive)

Strongly acid

Strongly alkaline

Weakly alkaline

Nearly neutral

Weakly acid Chlorite bleaching, Dyeing (Acid, Disperse)

Carbonization

pH of textile application

Wetting agent for desizing process

Enzymatic desizing Not deactivate enzyme Good detergency Should use nonionic wetting agent

Polyethylene glycol ether Block copolymer EO, PPO ether

Oxidative desizing : should use nonionic or sulphonate anionic type Resistance to persulphate

As Enzymatic desizing Sulphosuccinate derivative

Wetting agent for scouring process

High wetting power Good detergency and emulsifying Not specify the chemical alone Should use the blends of anionic and

nonionic surfactant. Fatty alkyl sulfate, sulfonate and phosphate Ethoxylated fatty alcohol Ethoxylated octyl-/ nonyl- phenol

Wetting agent for bleaching Resistance to oxidising agent

H2O2 resistance Ethoxylated alkyl phenol

Hypochlorite resistance Disodium alkyl diphenyl ether Sodium alkane sulfonate

Chlorite resistance EO of short chain carbon alcohol EO of alkylphenol EO + anionic surfactant

Wetting agent for carbonising process Resistance the mineral acid condition

Nonionic surfactant Sulfonated anionic surfactant

Wetting agent for mercerisation Resistance to strongly alkaline Small hydrophobic group and good alkaline

solubility Phenol derivative Blends of ethyl hexanol sulfate with organic solvent Short-chain alkylphosphonate esters

Conventional wetting agent(insoluble in concentrated alkaline)

Wetting agent for mercerisation

soluble in concentrated alkaline

poor wetting in neutral

still wetting property in alkaline

Rewetting agent

Promote wetting property of substrate after drying

Not necessary to good wetting propertyAnionic surfactantHigh EO unit nonionic surfactant

Scouring agent :

Factor for scouring

Scouring

Effects of scouring agent

Mechanical effect involved in washing

Wetting/Penetrating effect Emulsifying/dispersingSolubilizing effect Detergency Foaming effect Other effects

Structural propose for scouring agent Longer chain hydrophobic with remaining

soluble Linear hydrophobic part End position of hydrophilic part Cloud point is slightly higher than process

temperature (non-ionic) Optimum EO unit (different for hydrophobic part) Ionic head group can increase the detergency of

PEO surfactant (e.g. Laureth sulfate) Not adsorb on the fiber

Schematic of Scouring process

(a) Surface covered with greasy dirt.

(b) Surfactant is added to the solution. It reduce adhesion of dirt to the surface when deposited with hydrophobic tails on the surface.

(c) Dirt particle are held as a suspension.

Mechanism for greasy dirt removal from substrate

(a) Roll-up

(b) Emulsification

(c) Solubilisation

Example of scouring agent with variation of typesDetergent % Detergency

Sodium salts of sulfuric ester of higher alcohol 35.3

Lauryl diethanolamide (1:2 type) 48.4

Blends of above detergent 46.0

10 mole EO adducts of nonylphenol 47.0 0.3% solution of each chemical % Detergency = [(A – B)/(C – B)] x 100

Where A = Reflectant of soiled fabric after wash B = Reflectant of soiled fabric before wash

C = Reflectant of white fabric• Standard soiled solution contained

1 part Fully hydrogenated tallow3 parts Liquid paraffin0.8 part Carbon black800 parts Carbon tetrachloride

Emulsifying & Dispersing agent :

Distinguish of term

Emulsifying agent (Emulsifier)Agent for help immiscibility liquid/liquid to

uniformly distribute in each phase (liquid/liquid)

Dispersing agentAgent for help uniformly distribute of solid in

liquid phase (solid/liquid)

Emulsifying agent

High HLB values use for O/W emulsion Low HLB values use for W/O emulsion Mix of 2 or 3 emulsifiers can gave

emulsion stability than those of single useAll of type of surfactant can be used for

emulsifier depends on liquid/liquid phase

Schematic of anionic emulsion (O/W)

Dispersing agent

Dispersing agent for disperse dyes Anionic dispersing agent

Naphthalene sulfonate Lignin sulfonate

Nonionic dispersing agent Higher EO alcohol ethoxylate Higher EO non-ionic surfactant

Typical anionic dispersing agent

Napthalene sulfonate

Lignin sulfonate

Model of the disperse dye system

Dispersion thermal stability on dispersing agent structure

Levelling agent :Levelness

Unlevelness

Main mechanisms of levelling agents

Nonionic agents Usually form water-soluble complexes with the dye,

some degree of solubilisation being involved

Ionic agents Dye-substantive

Form complexes with the dye and there is competition between the levelling agent and the fibre for the dye

Fibre-substantive competition between levelling agent and the dye for the fibre

Levelling agent types and their uses

Levelling agent for acid dyes

Cationic levelling agent

Anionic levelling agent

Schematic representation of solubilised acid dye-agent complex

Mechanism of levelling for acid dyes

Dye-SO3-

C

O

N

H

N+H3

Dye-SO3-

C

O

N

H

N+H3

Levelling-SO3-

C

O

N

H

N+H3

Levelling-SO3-

C

O

N

H

N+H3

Dye-SO3-

Levelling-N+R4

Dye-SO3-

Levelling-N+R4

Dye-SO3-

C

O

N

H

N+H3

Dye-SO3-Levelling-SO3

-

Nylon

1. Complex dye-levelling

2. Competitive anionic levelling

Splitting out

Splitting out

Levelling agent for disperse dyes

Non-ionic levelling agent tend to be separated at high temperature but can increase dyes solubilisation (Low cloud point)

Anionic levelling agent can increase the cloud point of nonionic agent

Should synergistic mixing together 7-10% of B in A can increase cloud point of A alone

(105oC) to 150oC Fully effective at pH >7 (Carefully selection of dyes)

(A) fatty acid ethoxylate (B) sodiumdodecylbenzenesulphonate

Levelling agent for disperse dyes

Modified nonionic (or Modified anionic, Weakly anionic) Phosphate ester ethoxylation

High temperature stability Protect hardness and trace metal ion Stabilise under high concentration of electrolyte Fully effective at pH 4-5 (pH of disperse dyeing)

Levelling agent for disperse dyes

Oligo-soaps or Ethoxylated multi-ester compounds.

More stable dye dispersion at high temperature Solubilisation take place at a lower temperature Dyeing rate at lower temp. is much slower Solubilisation of oligomer and acrylic size Low foaming

Defoaming agent :

Foam breaking mechanism

Typical defoaming agent

Organic based defoamers Relatively poor foam control Some tend to leave deposit on machine Example is propylene-1,2-glycol

mononeodecanoate

Typical defoaming agent

Silicone based defoamers High efficiency for controlling the foam If the emulsion use not suitable emulsifier,

Silicone spot is usually occur. Example is ethoxylated polydimethyl siloxane

Conclusion : Surfactant auxiliary

Surfactant contain the balancing of hydrophilic part and hydrophobic part.

CMC and Cloud point of surfactants can indicate their application and property.

Surfactant usually locate at interphase. Ionicity of surfactant is the important

function for choosing.