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Rubber - SBR polymerization emulsifiers

SBR Emulsion polymerization is a type of polymerization which takes place in an emulsion which typically includes water, monomer and an emulsifier. Synthetic rubber is manufactured by this process where  the monomer(s) are styrene and butadiene.

 

Since most emulsion polymerizations are initiated by a free radical mechanism, OleoProp emulsifiers are important to ensure that it remains inert to free radicals

 

Product Code

Product Type

Description

PDS

SDS

OleoProp DR50-KS

Potassium soap

Potassium soap of disproportionated rosin

PDS

SDS

OleoProp SA30-L

Mixed Acids

Disproportionated mixed acids

PDS

SDS

OleoProp SA40-L

Mixed Acids

Disproportionated mixed acids

PDS

SDS

OleoProp 820

Fatty Acids

Disproportionated tall oil fatty acids

PDS

SDS

OleoProp 900

Fatty Acids

Disproportionated vegetable fatty acids

PDS

SDS

Nthabiseng Mzinyane

Key Account Manager

Performance Products

Nthabiseng.mzinyane@oleo.co.za

Email: nthabiseng.mzinyane@oleo.co.za

Since most emulsion polymerizations are initiated by a free radical mechanism, the choice of emulsifier is important to ensure that it remains inert to free radicals -  stabilization by disproportionation. Our rosin soap (OleoProp DR50KS) and fatty acid emulsifiers (OleoProp 820 & 900) are frequently the material of choice since they impart secondary advantages in rubber processing e.g. tack

 

Within the SBR industry, mixed rosin and fatty acid emulsifiers  (OleoProp SA40-L) are favoured because fatty acids soaps at the same concentration give higher conversion rates and more stable lattices than rosin emulsifiers.

 

 

By using a mixed acid emulsifier (i.e. both fatty acids and rosin emulsifiers) a balance of desirable properties of tack, oxidative stability and polymerization rate are maintained.

 

 

One problem associated with the use of sodium soaps rich in saturated fatty acids is that the cold (5°C) SBR recipe is prone to gel. Gelation is avoided by using potassium soaps.

 

Disproportionated Fatty Acid

 

Our catalytic process of converting polyunsaturated fatty acids to high levels of mono saturated fatty acid provides an opportunity for applications that are prone to oxidation or addition reactions. Our OleoProp 820 and 900 have less than 1.5% polyunsaturated fatty acid, a better replacement of partially hydrogenated tallow used for emulsion polymerization process.

 

Disproportionated Distilled Mixed Acid

 

Synthetic rubber manufacturers using emulsion polymerization to produce styrene-butadiene rubber (SBR) optionally choose a twin-pack emulsifier system comprising:

 i) partially hydrogenated tallow fatty acids

ii) disproportionated rosin

or they can use a single-pack pre-mix combination of based on tall oil fatty acids and tall oil rosin such as OleoProp SA40-L

 

When converted into soap, these stabilized emulsifiers enable the emulsion polymerization reactions to proceed without hindrance.

 

Download Brochure: OleoProp - SBR polymerization emulsifiers

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