English
中文简体Plasticizer TOTM, scientifically known as Trioctyl Trimellitate (or Tris(2-ethylhexyl) trimellitate), is a sophisticated and highly valued chemical additive in the polymer industry. As a key specialty plasticizer, it imparts superior performance characteristics to various materials, most notably Polyvinyl Chloride (PVC), making it indispensable in high-demand applications.
Chemical Identity and Properties
Plasticizer TOTM is a high-molecular-weight triester of trimellitic acid and 2-ethylhexanol, possessing the chemical formula . It is typically presented as a clear, oily liquid with a mild ester odor. Its complex, branched molecular structure is key to its outstanding performance profile, which offers a balance of properties similar to both monomeric and polymeric plasticizers.
The low volatility of plasticizer TOTM is one of its most critical advantages. This characteristic ensures that the finished plastic product retains its flexibility and physical integrity over a long service life, even when exposed to elevated temperatures, as the plasticizer doesn't easily evaporate or leach out.
Key Benefits in Polymer Modification
The primary function of any plasticizer is to increase the flexibility, ductility, and workability of a polymer. The unique structure of the plasticizer TOTM allows it to disperse efficiently between the polymer chains, weakening the intermolecular forces and thereby enhancing mobility. In addition to general plasticizing efficiency, it provides several premium benefits:
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Superior High-Temperature Performance: It allows plastic materials, particularly PVC compounds, to be classified for higher temperature grades (e.g., 105 °C), making it crucial for heat-resistant products.
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Excellent Extraction Resistance: Its high molecular weight gives it strong resistance to extraction by soapy water, oils, and other polar and non-polar fluids, maintaining product durability and lifespan.
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Low Toxicity Profile: In many applications, particularly the medical field, plasticizer TOTM has become a preferred alternative to phthalate plasticizers like DEHP due to its significantly lower toxicity concerns, contributing to safer end products.
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Good Electrical Insulation: It exhibits favorable electrical properties, which are essential for materials used in insulating components.
Applications of Plasticizer TOTM
Due to its high-performance characteristics, the use of plasticizer TOTM is focused on durable, high-specification products where heat resistance, permanence, and electrical integrity are paramount.
Wire and Cable Industry
This is a core application. The excellent thermal stability and electrical insulation properties of plasticizer TOTM make it the ideal choice for insulating and jacketing materials for high-temperature wires and cables. It is vital for producing 105 °C grade heat-resistant cable compounds.
Automotive Sector
In automotive interiors, parts are exposed to high temperatures, particularly under sunlight. Plasticizer TOTM is used in components like instrument panels, door panels, and wire harnesses to ensure they maintain their flexibility and do not fog (volatilize) or degrade under prolonged heat exposure.
Medical Devices
Its low volatility, extraction resistance, and favorable toxicity profile have made plasticizer TOTM a primary choice for various medical PVC products, including flexible tubing, catheters, and blood bags.
Other High-Durability Products
It is also utilized in gaskets, seals, industrial coatings, and other flexible components that require durability and chemical resistance. In these uses, it often serves as an efficient and desirable substitute for polyester polymeric plasticizers where improved processing and performance are sought.
