Problems in the use of fiberglass mold release agent

There are many problems in the use of fiberglass mold release agents. Due to insufficient information, problems often arise during use, especially when using fiberglass mold release agents, which brings great difficulties to our work. Today, the editor of Jianyi Chemical will discuss with you the issues in the use of fiberglass mold release agents, as follows:

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 during mixing, the internal release agent should be added to the resin.