Adiprene LF - prepolymers
with excellent properties
M2 PRESSWIRE-August 23, 2019-: New low free isocyanate prepolymers
for adhesives and sealants
Thanks to the proven LF technology, various polyols and diisocyanates can be used to produce prepolymers
with very low free diisocyanate monomer content.
exhibits a slightly lower deblocking temperature and faster deblocking time at 160 [degrees]C compared to that of phenol (Table 2), as per DSC analysis under the same conditions previously reported.
Polymerization Procedure to Prepare PCCD Prepolymer
"The focus of our development work is to broaden the range of prepolymers
with very low free isocyanate content - a key lever to improved industrial hygiene and worker safety," explained King.
Suprasec is the trade name for Huntsman's range of MDI and MDI-based prepolymers
which are used to formulate adhesives, coatings and elastomers.
Johnston explains that since both variations of prepolymers
are high-performing, moisture-cure 1K polyurethane sealants and 1K silane-terminated sealants continue to grow in popularity.
Table 1 shows the effect of the dosage of HDI, reaction time, and prepolymer
molecular weight changes on the chain extension products.
Various amounts of CNT were incorporated into prepolymer
of polysilozane fanging from 0~0.15 vol%.
Synthesis of UF prepolymer
.--A three-necked flask was charged with UF and ammonia at a molar ratio of 1:1.1.
was synthesized via a three-step procedure in a 250 mL four-necked, round-bottomed flask equipped with a mechanical stirrer, a thermometer, a dropping funnel, an inlet of dry nitrogen, and a reflux condenser with a drying tube.