Predicted inhibition and gel time
for varying mold temperatures.
The addition of mangium tannin extract decreased pH, gel time
, and viscosity of PTF resins and increased the solid content of PTF resins.
The inverted cup method was adopted to measure the gel time
of the CP.
The gel time
can be adjusted effectively by adjusting the viscosity and pH of the acid water glass, which are the two key factors affecting the gel time
As it was mentioned before the gel time
of the epoxy system is about 45 minutes, but for molding just 20 to 25 minutes are available.
The resin of a higher content of alkali has a lower curing rate, evaluated in technical analysis by a gel time
of resin (Table 1).
All initiators showed a decrease in gel time
with increasing concentration, indicating that a faster reaction is occurring (Fig.
Figure 2, showed a decrease in gel time
with increase in concentration of the catalyst due to the increase in reaction rate.
For each concentration of phenol, four sets of samples with pH values 9.5, 10, 10.5 and 11 are tested to find the gel time
. The experimental data are shown in Table 2.
It has a gel time
of 7 seconds and can be applied to any thickness in a single application.
The trends for gel time
correlate closely with the degree of steric hindrance.