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Ningbo release agent: the use of release agent precautions
Since most liquid-like insideMold release agentThey are all acidic, so the following problems should be paid attention to in use:
1. The use of acid-sensitive pigments can cause color changes.
2. When using alkaline fillers, such as calcium carbonate, the acidic release agent will react with it, causing the viscosity of the mixture to increase, but it will not affect the 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 process of the mixture. Cause problems such as bubbles and cracks.
Generally, the initial amount of internal release agent is 1% of the resin amount, and the effective addition range is 0.75-2% based on the weight of the resin. It should be appropriately adjusted according to the actual situation. The specific adjustment methods are as follows:
1, thin-walled simple profiles, the amount can be appropriately less, such as 0.8% or less.
2, thick wall or complex shape profiles need to add more.
3. In the high filler system, the addition amount of internal release agent should be increased. But the internal release agent added too much, will delay curing.
4. In pultrusion production, if the resistance is too large and the reason cannot be found, it needs to be increased appropriately.Mold release agentDosage, in use should pay attention to the feeding sequence, when mixing should be in the addition of curing agent, filler and other resin additives before, the internal release agent and resin system and mixed evenly, so as to achieve the best release effect.
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