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The reaction was carried out at 80[degrees]C and 200 rpm for 1 h, then DBTDL was dripped to the mixture as a catalyst and reacted for 1 h, afterwards, a certain amount of DMPA was added at 60[degrees]C and 300 rpm.
In addition, the use of DBTDL (0.01%) resulted in a significant increase in the rate.
The polyols (140 g), DBTDL (catalyst, 0.03 wt% based on solid content), and DMF (solvent, 30 g) were placed in a four-necked flask that was equipped with a thermometer, a stirrer, a condenser, an inlet and outlet for dry nitrogen, and a heat jacket, and then the system was degassed under vacuum at 80[degrees]C for 1 h to obtain stable solution.
The calculated amounts of HCSO and catalyst (DBTDL, 0.2 wt% of HCSO and IPDI) were dissolved in CA (Table 2), then the calculated amount of IPDI monomer was added such that the NCO-to-OH ratio ranged between 1.4 and 2.
BDO was used as a chain extender, DBTDL was used as a catalyst, and TEA and EDA were used as neutralization agents in this reaction.
Also, 1.6 mL of DBTDL was added to the solution as a catalyst.
IPDI and DBTDL were added in the solvent of a certain proportion of xylene and butyl acetate.
A small amount of acetone (< 5%) and DBTDL were added, and the mixture was placed under vacuum for an additional five minutes.
150 ppm of DBTDL catalyst in (1% by weight in THF solution) was added and the mixture was stirred at 60[degrees]C for 1 h.
To investigate a tin compound with a different ligand, dibutyltin dilaurate (DBTDL) was added to the study.
After the temperature was reduced to 80[degrees]C, 42.0 g (0.19 mol) of IPDI was added and reacted with PPG in the presence of 0.1 g of DBTDL for 2 h under stirring at nitrogen atmosphere.
When CF resin was dissolved, DBTDL (0.54 g) and IPDI (22.2 g, 0.1 mol) were added drop-wise into the reactor and the temperature was heated to 50[degrees]C.
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