Stabaxol MTCA new carbodiimide

With reactivity as acid scavenger at room temperature

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Summary

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�The Stabaxol® product range is well known as highly efficient stabilizers for

hydrolysis protection of polyesters.

�Nevertheless they have limited access to some applications due to the fact

that Stabaxol requires processing at elevated temperatures.

�Some applications like adhesives or cold cast polyurethanes are processed

at room temperature and therefore cannot be stabilized with the conventional

Stabaxol® product range.

�The project aimed for stabilizers that are highly reactive at room

temperature and can be handled easily.

New monomeric CDILiquid vs. Solid

Solid: Stabaxol I, I LF, I

powder

Stabaxol MTC: Liquid

(20 mPas / 25 °C)

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Application 1: Acid scavenger –Reactivity at room temperature

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Improved acid scavenger properties:•More effective acid scavenger at lower concentrations

•Reactivity at room temperature•Liquid substance and therefore easy to handle

Application 2: Acid scavenger in ester-based lubricant oils

Effect of Stabaxol® MTC: Retention of the Total Acid Number

TAN stays < 0,1 mg KOH/g at very low concentrations of Stabaxol® MTC

Prevention of hydrolysis and prolonged lifetime of the lubricant

Modified ASTM-D 2619 (96h)(Hydrolytic Stability “beverage bottle test")

ASTM D 2619(modified)

Rapeseed oil Rapeseed oil

+ 0,5 % SXL I

Rapeseed oil

+ 1 % SXL I

Rapeseed oil

+ 0,5 % SXL MTCNEW

TAN in oil (mg KOH/g)

0 h 0,10 0,08 0,07 0,05

TAN in oil (mg KOH/g)

96 h 0,19 0,1 0,08 0,02

TAN in oil (mg KOH/g)

168 h 0,32 0,3 0,10 0,07

TAN in oil (mg KOH/g)

312 h 1,01 0,8 0,07 0,05

Application 3: Hydrolytic Stability of polyester based cold cast PU-Elastomer

Hydrolysis protection achieved:

Retention of the tensile strength with very low concentrations of Stabaxol® MTC

Limit of usability:

Tensile strength retention of 80 %

Application 4: Hydrolytic stability in PU-based adhesives

Adhesive material destruction point ( ) retarded:

Extended lifetime and hydrolysis protection achieved

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Conclusion

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� Stabaxol® MTC provides the desired properties:

• Liquid at room temperature

• Reactivity at room temperature

• More effective acid scavenger at lower concentrations

• High carbodiimide content (17,5 %)

� Designed for target applications:

• As acid scavenger in ester-based lubricant oils

• As hydrolysis stabilizer in polyester based cold cast

PU-Elastomers

• As hydrolysis stabilizer in polyester based adhesives