Description:
CD421A is a new aliphatic monofunctional methacrylate monomer
that offers a lower volatility, lower odor and higher Tg alternative
to cyclohexyl methacrylate. It provides good viscosity reduction,
low shrinkage and high strength bonding characteristics for
peroxide-cured adhesive applications, such as automotive, anaerobic,
laminating and anchor bolt adhesives. It is also a good low
odor, low volatility, more flexible alternative to methyl methacrylate
(MMA) in construction adhesives.
SR214A, SR297A, and
SR210A are dimethacrylate monomers having increasing molecular
weight, respectively. They offer improved thermal stability
over their respective standard product grades, while maintaining
good cure performance and good adhesion properties. These monomers
provide crosslinking, which results in higher adhesive strengths
and faster cure.
Table 1 shows the
80 °C storage stability for CD421A, SR214A, SR297A and SR210A
versus the respective standard product grades. Thermal stability
is improved for all monomers. SR214A and SR210A offer significant
improvements.
Table 2 presents the
cure package used to examine gel times of the high performance
methacrylates and their corresponding standard grade products.
Figure 1 shows the
gel times @ 25 °C for CD421A, SR214A, SR297A, and SR210A
versus the respective standard product grades. Each of the higher
performance dimethacrylate monomers exhibits only a slight increase
in gel time at ambient temperature. The gel times for CD421
and CD421A were measured at 140 °F due to the much slower
rate of cure. The higher performance monofunctional methacrylate
monomer, CD421A, also exhibits only a slight increase in gel
time.
The formulation presented
in Table 3 was used to examine gel times of the high performance
methacrylates and their corresponding standard grade products.
Figure 2 shows a comparison
of lap shear adhesion results for CD421A, SR214A, SR297A, and
SR210A versus their standard product grades. The higher performance
dimethacrylate monomers (SR214A, SR297A, and SR210A) all yielded
very similar adhesion results to the standard grade products.
The higher performance monofunctional methacrylate monomer,
CD421A, yielded a slightly lower adhesion result due to the
slower cure rate compared to the dimethacrylates.
