The English name for the lactam compound containing an active vinyl group, n-vinylcaprolactam, is N-Vinylcaprolactam, NVCL, abbreviated as V-Cap.
The active vinyl group present in the molecular structure of n-vinylcaprolactam makes it an important organic intermediate for the production of poly-n-vinylcaprolactam. Its homopolymers or copolymers have been widely used in pigment dispersants, detergent builders, cosmetic and pharmaceutical auxiliaries, textile processing auxiliaries and binder auxiliaries, as well as for stabilizing and clarifying juices and beers.
Especially in recent years, it has been found that the homopolymer or copolymer of n-vinylcaprolactam has a temperature sensitivity of low critical phase transition temperature, and its phase transition temperature is just in the physiological temperature range (30-40 degrees Celsius). The characteristics have aroused great interest, and extensive research has been carried out on the application of such polymers in biological, medical materials and daily chemical varieties.
At present, the synthetic process for industrial production of n-vinylcaprolactam reported abroad is an acetylene route, that is, in the range of 0.75-3.0 MPa pressure range and 100-200 degrees Celsius, caprolactam and acetylene are ethyleneated to obtain n-vinylcaprolactam. The catalyst used is KOH, an alkali metal or potassium t-butoxide or the like.