Thermosetting phenolic resins are heated in a high-temperature bath for a certain period of time after moulding to promote cross-linking.
Post-curing improves heat resistance (Tg: glass transition point).
However, as the heat resistance is increased, the resin becomes harder but also more brittle, so it is necessary not to increase the heat resistance more than necessary.
It is therefore necessary to avoid raising the heat resistance beyond the required level.
We use our own experimental formula for heat treatment (post-cure) conditions and heat resistance (Tg).
We bring phenolic moulded products to the required heat resistance temperature in the shortest possible heat treatment time.
The experimental formula for estimating Tg after post-cure is
Tg = 9.4 x In (cure time) + 0.7 x (cure temperature) + 0.3 x (initial Tg of part) + 23.4 (constant).
Note that the initial Tg is the same as the mould temperature.
t is inefficient to take a long time to increase Tg.
The more efficient way to increase Tg is to increase the curing temperature.
From the estimated formula, it can be said that it is more efficient to increase the curing temperature in order to increase the Tg of the material.
Comparisons were made between the estimated experimental formula and the actual measured values, and the Tg values were almost exactly as targeted.
Based on the results of this experiment, we were able to proceed to the mass production of "phenolic resin caliper pistons".
The results of this experiment allowed us to proceed to the mass production of the 'phenolic resin caliper piston'.
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