Identifying Organic Contaminants in Sub Tier Castings Using FTIR Fingerprinting
Attenuated total reflectance FTIR identifies organic parting agents on raw castings before expensive coating processes fail on customer lines.
Ester Waxes
Meaning
Organic compounds formed by the reaction of fatty acids with alcohols function as internal and external lubricants in the processing of plastics and coatings. Manufacturers use ester waxes to improve the flow of molten polymers through extruders and injection molds. These additives also enhance the surface gloss and scratch resistance of finished products.
Chemical Property
Molecular structures consisting of long carbon chains provide a high melting point and low volatility compared to mineral-based alternatives. Because ester waxes are polar, they interact effectively with both the polymer matrix and the metal surfaces of processing equipment. This polarity ensures that the lubricant remains distributed throughout the material during high-temperature cycles.
Variations in the chain length allow for the tuning of the wax to specific resin types.
Industrial Utility
Lubrication of the melt reduces the torque required by the extruder motor and prevents the degradation of heat-sensitive materials. Adding ester waxes to a formulation allows for faster cycle times and lower processing temperatures. In the production of polyvinyl chloride pipes and fittings, these waxes prevent the material from sticking to the hot metal of the die.
They also serve as dispersing agents for pigments and fillers, ensuring a uniform color across the batch.
Processing Stability
Resistance to oxidation and thermal breakdown makes these compounds suitable for demanding manufacturing environments. When ester waxes are used in high concentrations, they do not adversely affect the mechanical properties or the transparency of the host polymer. In China, the use of these additives in food-contact materials is governed by the GB 9685 standard, which sets specific migration limits for various substances.
Compliance is verified through laboratory testing and the submission of technical dossiers to provincial health authorities.