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.
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 .
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.