How to choose a release agent for TPE elastomer injection molding?

  • Time of issue:2021-09-01
  • Views:639

How to choose a release agent for TPE elastomer injection molding?

  • Categories:Elastomer knowledge
  • Author:SPP
  • Time of issue:2021-09-01
  • Views:639

The release agent is a functional substance between the mold and the finished product. The release agent is chemically resistant and will not be dissolved when it comes in contact with the chemical components of different resins (especially styrene and amines). The release agent also has heat resistance and stress properties, and is not easy to decompose or wear; the release agent adheres to the mold and does not transfer to the processed part, and does not interfere with painting or other secondary processing operations. Due to the rapid development of injection molding, extrusion, calendering, molding, laminating and other processes, the amount of release agent has also been greatly increased.

Five categories of   tpe release agent:

   1. According to the different ways of using the release agent, there are external release agents and internal release agents. The external mold release agent is to directly apply the mold release agent on the mold; the internal mold release agent is a compound whose melting point is slightly lower than the ordinary molding temperature. It is added to the resin during the thermoforming process, and it is compatible with the liquid resin , But it is incompatible with the cured resin. Under certain processing temperature conditions, it oozes from the resin matrix and forms a layer of isolation film between the mold and the product.

2. According to the state of the release agent, there are film type (mainly polyester, polyethylene, polyvinyl chloride, cellophane, fluoroplastic film), solution type (mainly hydrocarbons, alcohols, carboxylic acids and carboxylic acid esters, Metal salts of carboxylic acids, ketones, amides and halogenated hydrocarbons), paste and waxy (including silicone ester, HK-50 heat-resistant ointment, cylinder oil, gasoline and asphalt solution and wax type) release agent. The base wax type release agent is the most widely used type of release agent. It is cheap, easy to use, non-toxic, and has a good release effect. The disadvantage is that it will stain the surface of the product and affect the surface paint. Make demolding difficult. For large-scale products with complex shapes, they are often used in combination with solution-type release agents.

  3. According to the combination of release agents, there are single type and composite type release agents (including component compounding and compounding in the way of use).

   4. According to its chemical composition, there are inorganic release agents (such as talc, kaolin, etc.) and organic release agents.

   5. According to the use temperature of the release agent, there are normal temperature type and high temperature type release agent, such as normal temperature wax, high temperature wax and stearates.

   If the surface of the TPE soft rubber is sticky or agglomerated, you can mix it with a powdered release agent. If the hardness is high and the rubber with a dry surface is difficult to release, you can use a filling spray type high-efficiency release agent. Different products have different requirements on the surface, so the release agent should be selected accordingly.

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