DBTODibutyltin Oxide
DBTODutch Bass Trombone Open (Netherlands)
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The concentration of TPOS was given by the AV/OR ratio that was equal to 10 (AV/OR is the ratio between the mole number of ester groups of EVA and the mole number of alcoxy groups of TPOS) and the concentration of DBTO was 0.5 phr (gram per hundred grams of rubber).
Dibutyl tin oxide (DBTO) was used as a precursor to the catalyst (distannoxane) for the alcoholysis reaction.
DBTO content is reported in wt% relative to the EMA phase.
Figure 4 presents the torque-time curve for the batch mixing of two blends containing EMA, DBTO. and 1,5-pentanediol.
The EMA and DBTO are introduced first in the mixer to melt EMA phase and distribute the DBTO.
4: 88% and 92% respectively for the blends at 200[degrees]C, 0.25% DBTO and 220[degrees]C, 1% DBTO.
Increasing the DBTO content from 0.13 to 0.26 wt% of EMA phase (blends #5 and 3) results in insoluble fraction increasing from 3%, up to 45%.
Figure 10 shows the correlation between extent of reaction and time at various concentration of MBTO and DBTO as a catalyst in the direct-esterification.
The Effect of MBTO and DBTO Condensation as a Catalyst.
In the effect of the concentration of MBTO and DBTO catalyst, the reactivity of the MBTO catalyst is higher than that of the DBTO.