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TEPCAR2.ppt TEPKAR - SEMINAR 6.11.2000 1

Seminar at Company Tepkar06.11.2000 in Istanbul

Wacker Silicones for Detergent Industry

D.I. Ernst Innertsberger, S-F-C-T2

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Silicones as Foam Control Agents

...are used over 40 years in many industries e.g. in textile,

leather, paints and others as so called defoamers, antifoam

agents etc....

...since the phosphate-reduduction or elimination in detergents

(during the 80-ies) Silicones became more and more polular and

have been established as very useful ....

Foam Control Agents in Detergents.

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Why are foam control agents necessary in the Detergent

Industry?

Detergents contain beside other raw materials:

Builder substances: e.g.Zeolite, Phosphates

Bleching agents: Perborates, Percarbonates

S u r f a c t a n t s : nonionic and anionic types

they are important for the cleaning effect and ....

they creat/cause remarkable volumes of foam....

Foam must be controlled

to avoide overfoaming and

guarante enough mechanical treatment of the cloths.....this means....

Sud suppressors: are essential ingredients

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Which Types of Sud suppressors or Foam Control Agents are

mainly used in the Detergent Industry?

Soaps:

Old established foam control agent

Advantage: Cheap, dosage level: 1 - 4 %

Too high levels cause problems ( > 4 %)

Function depends from the water hardness (-> Ca-Soaps) Function depends from the washing temperature

Silicones:

Established, low dosage sufficient: 0,1 - 0,3 % as active matter

Work undependent from the water hardness

Work undependent from the temperature

Can be combined with other types like soaps or paraffines

Physiological friendly; eliminated by adsorption to the waste water sludge

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4 Inserted pictures to the following topics will follow

Different washing machines; much foam in European washing systems due the

high turbulence.

Antifoam Mechanism: Silicones spread on the lamella, shift tthe organic

surfactants beside and make the lamella thinner and less stable. Solid particles in

the defoamer destroy the foam or accelerate the foam collapsing...Physical model...

Types/Classification of Silicone Defoamers:

Fluids alone work only in organic systems; For wwater based foams the

Compounds are the basic products, they can be formulated to emulsions and

powders or self-dispersing products....

The big challenge between activity and compatibility - the main criteria to select a

defoamer: What does the customer system require in respect of

compatibility, dispersibility, stability....

About above: See next 4 slides.

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4 slides will be inserted

Washing systems: page 6a

Mechanism of defoaming: page 6b

Classification of defoamers: page 6c

Challange between activity and compatibility: page d

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Main Defoamer Compounds

Antifoam Agent S 132 (20.000 cps)

Key product for manufacturing of AF-Powders and Emulsions

Use for structured Liquids Detergents and Gels

Sometimes used for direct spraying onto detergents

Easy to dispers, no spotting tendency

Antifoam Agent S 124 (3000 cps)

Low viscous Compound for multi-purpose use

easy to handle

slurry deaeration

Antifoam Agent S 167 (400 cps)

Low viscous, water free, good dispersible defoamer for LDs

Good compatible with many LDs and cleaners

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Main Antifoam Emulsions

Antifoam Emulsion SE 36

high efficient emulsion, viscous

designed for none structured Liquid Detergents

used in many LD-types

Antifoam Emulsion SE 39

highly efficient, low viscous

used in strong foaming surfactant formulations

approved for LD-types, manly strutured

approval for rinse cycle softener production as processing aid

used as slurry deaerating aid

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Main Wacker Antifoam Powders for Powder Detergents

Antifoam Powder ASP 15

organic/anorganic based carrier, neutral

established at many companies in Europe and some in USA

certain request for dish washing formulations (in USA)

Antifoam Powder ASP 16

based on washing active substances

bead structured

good free flowing properties

well balanced foam profiles good storage behaviours

dosage 1 - 2 %

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Test Methods at Wacker to serve the Detergent Market with

Silicone Defoamers

Foam Profile measuring in foam height recording washing

machines

Measuring of detergetns without and with defoamers

accordings customers demand (dosage, gardness, load..)

preselection of AF-Powders, type, dosage

storage tests, stability/activity beforre and after storage

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Insert of 3 slids:

Washing machines for foam measuring: 11 a

Foam profiles of ASP 16 at 90, 60, 40 C: 11 b

Foam profiles of ASP 16 after climatic storage: 11 c

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Compatibility Tests

Made on liquid formulations, e.g.

Liquid Detergents

Cleaners

Others

Check of the fit of a defoamer to the customers product

by gentle inserting

after storage

according a compatibilty matrix

made in respect of the observed effect like

unchanged, slightly turbide, turbide, flocculation

separation o the top, sedimentation etc.

Make a compatibility matrix: See 12 a

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Additional activity tests of different liquid formulations

Precheck of the fuctionality

in a circulation system, which seems to become later an EN-Norm tocheck the foamability of surfactants

...at Wacker combined with Contifoam

an electronic foam-height recording system

...test of the foamability without or with defoamers

3 typical test modes are mainly used....

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3 slides are inserted (before):

Circulation apparatus with Contifoam foam height recording system: 13 a

Established Contifoam modes: 13 b

Examples with different surfactants: 13 c

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Silicones-Applications beside Defoaming

General interest in Fabric Care Effects beside washing

Introduction of fiber treatement during main wash is difficult:

competence between cleaning and adsorption is high

Trials to offer fabric care effects like...

easy ironing

softening

good rewetting

... during or with the rinse cycle process/products.

The project/process is ongoing

first aspects of progress can be shown

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Easy Ironing

Produkt Easy Ironing Rewetting Softening

Powersoft DF30*

++ ++ -

Wetsoft CTW ++ ++ -

CT 34 E - + ++

HeBa 162* ++ + -

* experimental status

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