Selection method of release agent

Due to the fact that most liquid release agents are acidic, the following issues should be noted during use:

1. The use of acid sensitive pigments can cause color changes;

2. When using alkaline fillers such as calcium carbonate, acidic release agents will react with them, causing an increase in the viscosity of the mixture, but it will not affect the release effect;

3. If the filler is aluminum hydroxide, the acidic release agent will not only increase the viscosity of the mixture, but also release water during the curing process, causing problems such as bubbles and cracks. Usually, the initial dosage of internal release agent is 1% of the resin amount, and the effective addition range is based on 0% of the resin weight.

Due to the fact that most liquid release agents are acidic, the following issues should be noted during use:

1. The use of acid sensitive pigments can cause color changes;

2. When using alkaline fillers such as calcium carbonate, acidic release agents will react with them, causing an increase in the viscosity of the mixture, but it will not affect the release effect;

3. If the filler is aluminum hydroxide, the acidic release agent will not only increase the viscosity of the mixture, but also release water during the curing process, causing problems such as bubbles and cracks.

Usually, the initial dosage of internal release agent is 1% of the resin content, and the effective addition range is 0.75-2% based on the resin weight. Adjustments should be made appropriately according to the actual situation.

1. Thin walled simple profiles can be used in smaller quantities, 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 added should be increased, but excessive addition of internal release agent can delay curing.

4. In extrusion production, if the resistance is too high and the cause cannot be found, it is necessary to increase the amount of release agent appropriately. When using, attention should be paid to the feeding sequence. Before adding curing agents, fillers, and other resin additives, the internal release agent should be added to the resin system and mixed evenly. This can achieve the best demolding effect.