Since most liquid internal mold release agents are acidic, the following issues should be paid attention to during use:
1. The use of acid-sensitive pigments will cause color changes;
2. When using alkaline fillers, such as calcium carbonate, acidic mold release agents will react with it, causing the viscosity of the mixture to increase, but it will not affect the mold release effect;
3. If the filler is aluminum hydroxide, the acid release agent will not only increase the viscosity of the mixture, but also release water during the curing of the mixture, causing problems such as bubbles and cracks.
Generally, the initial amount of internal release agent is 1% of the resin, and the effective addition range is 0.75-2% based on the weight of the resin. It should be adjusted appropriately according to the actual situation.
1. For simple thin-walled profiles, the amount can be appropriately less, such as 0.8% or less;
2. Thick-walled or complex-shaped profiles need to be added more.
3. In high-filler systems, the amount of internal release agent should be increased, but if the internal release agent is added too much, curing will be delayed.
4. In pultrusion production, if the resistance is too large and the cause cannot be found, it is necessary to appropriately increase the amount of release agent. When using, pay attention to the order of addition. When mixing, add the internal release agent to the resin system and mix well before adding the curing agent, filler and other resin additives. This can achieve the best demoulding effect.
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