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.
Cardanol-blocked
prepolymer 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.
The
prepolymer 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.