Effect of Preparation Parameters on the
Gel Time of the CP.
From the rheology measurements the
gel time was determined and found to decrease with increasing initiator concentration.
The
gel time of aliphatic coatings allowed this technique to be used; however, the aromatic systems used as controls could not be applied this way due to their extremely fast set times.
For the PF-B resins, with the increasing of bio-oil addition percentage, the
gel time decreased first and then increased quickly.
As all A16 adducts theoretically have the same functionality, therefore MXDA's fast
gel time is indicative of its faster reaction rate.
Gel time or pot life of different PU adhesive formulations.
Dynamic oscillatory measurements allow accurate determination of the systems
gel time. In these experiments, the evolution of the modulus G(t) is measured in small amplitude oscillatory shear as a function of cross-linking time while, frequency is kept constant throughout the experiment [16].
Key statement: A thermoplastic composition that includes from about 1% by weight to 25% by weight block copolymer having the formula (A-B)x or A-B-A, where the A block includes polyvinylarene, the B block includes poly(monoalkenyl) and x is an integer of at least one, spherical superabsorbent particles comprising polyacrylate, and plasticizing oil, the composition exhibiting water
gel time of no greater than two minutes, a viscosity of no greater than 100,000 centipoise and a wet tensile strength of at least 15 g/[in..sup.2].
Johns, Michigan, USA, has developed an optically clear, UV-stable polyurethane that gels in less than 20 minutes and a high-performance polyurethane that meets UL 94-V0 standards and has a 90-second
gel time.
Technical subjects include VOA (volt/ohm/amp) meters, continuity testing, transducer and head pressure relationship between psi and feet of water, temperature effect on grout
gel time, chemical soil mixture effect and more."
This is consistent with the
gel time data in Figure 8.
Your inspector should also verify the
gel time of the grout each time a new batch is mixed.
