To produce a polyamide block copolymer, (a)100 parts by wt of a lactam (e.g. 2-pyrrolidone or ε-caprolactam) is suspended in (b) 50-2000 parts of an organic liquid (aliphatic or alicyclic hydrocarbon) preferably with (c) suspending agent (a polymer of mol. wt. 500-10,000,000, compatible with the liquid and with the lactam via a basic N or -COOH group) in amount of 0.01-20 part per 100 parts of (a), (d) and (e); to the suspension is added (d) 0.01-20 parts of an anionic polymerisation catalyst (e.g. a reaction product of a lactam and a metal compound, e.g. MgI₂) and (e) a polymer activator or accelerator which is also a comonomer and has a functional group for lactam polymerisation in amount of 0.1-80 parts per 100 parts of (a), (d) and (e). The temperature is raised to up to 200°C to cause polyermisation and the block copolymer is separated.
Preparation of (c) and (e) are described; (e) need not be isolated before use.
The copolymer can be mixed with pigment and/or stabilizer; it is granular or powdery and is easy to handle for molding as a nylon.
为了生产聚酰胺嵌段共聚物,(a)将 100 重量份的内酰胺(如
2-吡咯烷酮或ε-己 内酰胺)悬浮于(b)50-2000 重量份的有机液体(脂肪族或脂环族烃类)中,最好加入 (c)悬浮剂(分子量为 500-10,000,000 的聚合物,通过碱性 N 或-COOH 基团与液体和内酰胺相容),加入量为每 100 份(a)、(d)和(e)中 0.01-20 份;在悬浮剂中加入(d)0.01-20 重量份的阴离子聚合催化剂(如
2-吡咯烷酮或ε-己内酰胺的反应产物)。(d)0.01-20 份阴离子聚合催化剂(例如内酰胺和
金属化合物的反应产物,如 MgI₂);(e)聚合物活化剂或
促进剂,它也是一种共聚单体,并具有用于内酰胺聚合的官能团,其用量为每 100 份(a)、(d)和(e)中的 0.1-80 份。将温度升高至 200°C,使其聚合,然后分离嵌段共聚物。
(c)和(e)的制备方法如前所述;(e)在使用前无需分离。
该共聚物可与
颜料和/或稳定剂混合;呈颗粒状或粉末状,易于处理,可作为尼龙模塑。