Ethylene bis stearamide (EBS), also known as vinyl bis stearamide, is a representative variety of fatty bisamide compounds in plastic lubricants. It plays a decisive role in the processing of thermoplastic resins such as rigid PVC, ABS, AS, PC, and POM.
Physical and chemical properties of ethylene bisstearamide (EBS):
It is understood that ethylene bisstearamide is in the form of white particles or powder. The melting point of industrial products is 140~146.5℃, the density is 0.98g/cm3 (25℃), it is non-toxic, insoluble in water, and stable to acids, alkalis and water media, but the powder is wettable above 80℃. Insoluble in most common solvents such as ethanol, acetone, carbon tetrachloride, etc. at room temperature. It is soluble in hot chlorinated hydrocarbons and aromatic hydrocarbon solvents, but will precipitate or gel when the solvent is cooled. The flash point is about 285°C.
EBS is one of the earliest fatty bisamide products developed. The EBS structure contains a polar amide group and two long carbon chain hydrophobic groups, giving it high-temperature lubricity and low-temperature anti-stick properties. and other characteristics, coupled with its good compatibility with synthetic resins such as acrylonitrile-butadiene-styrene polymer (ABS), polyvinyl chloride, phenolic resin, polystyrene, etc.
The production and synthesis method of ethylene bisstearamide (EBS):
The industrial production of EBS began in foreign countries as early as the early 1960s. There are dozens of brands of which it is the main component. The synthesis methods of EBS can generally be divided into four routes:
The reaction of stearic acid and amine compounds; the reaction of stearic acid ester and amine compounds; the reaction of stearyl chloride and amine compounds, and the reaction of nitriles hydrolysis.
The most commonly used ones are Type 1 and Type 2. The first method has a simple process, the reaction conditions are not harsh, and there are no three wastes, but the purity is low; although the second method obtains EBS with high purity, it consumes a lot of energy, has a complicated process, and has a long process.
Obtained from the reaction of stearic acid and ethylenediamine: put 1 mol of stearic acid into the reaction kettle, heat and melt. Continue to raise the temperature while stirring, and start adding ethylenediamine when the temperature reaches about 140°C. The amount added is equivalent to 1.5 times the mass fraction of stearic acid. The generated by-product water and low boiling point substances are separated through a water separator. The reaction temperature is maintained at 140-160°C. When the separated water no longer contains ethylenediamine, the reaction is terminated and the material is discharged while hot to obtain ethylene diamine. Stearamide, cool and package after molding.
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