1. What is the difference between internal release agent and external release agent?
Release agents can be divided into internal release agents and external release agents according to different usage methods. There are two major categories of molding agents, so what is the difference between them?
Generally speaking, the main difference between internal release agent and external release agent is usage: external release agent can be applied directly on the mold; internal release agent has a melting point higher than the ordinary molding temperature. A slightly lower compound, which is added to the resin during the heating molding process. It is compatible with the liquid resin but incompatible with the cured resin. Under certain processing temperature conditions, it oozes out from the resin matrix and is between the mold and the product. Form a layer of isolation film to achieve a demoulding effect.
2. Is it better to use an external release agent or an internal release agent?
Compared with external release agents, internal release agents have their own advantages. Internal release agents The advantage of the agent is that the internal release agent can improve production efficiency because there is no need to spend time spraying and cleaning the mold. Secondly, internal release agents can reduce labor intensity because operators do not need to spray manually. Also, since the internal release agent is added directly to the material, it can better control the release effect, thereby achieving better product quality.
However, the internal release agent also has certain disadvantages. Because the internal release agent sometimes cannot be transferred to the mold interface or cannot ensure 100% release efficiency, it may affect industrial production; in addition, many internal release agents Film agents have limited ability to achieve high-performance release effects. For example, if they affect the surface properties of finished products, they require the assistance of external release agents.
3. Can internal release agents and external release agents be used together?
Both internal release agents and external release agents are release agents. , the function is the same, generally one of them can be used, and in some cases they can be used together. For example, the internal release agent is used as a component in the foaming formula, so using the internal release agent will often change the foaming formula. , and may affect the physical properties of the parts. At this time, it needs to be used together with an external release agent.
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