Method for continuously producing polyamide oligomers and producing semicrystalline or amorphous polyamides that can be thermoplastically processed
申请人:BASF SE
公开号:US10676569B2
公开(公告)日:2020-06-09
The invention relates to a process for continuously preparing polyamide oligomers. This comprises continuous conveying of an aqueous solution of polyamide-forming monomers from a reservoir vessel into an oligomerization reactor, heating of the aqueous solution beyond a dissolution or storage temperature, the residence time of the monomer solution in the oligomerization reactor being limited and the pressure or the partial vapor pressure of the water being adjusted such that a conversion of monomers to polyamide oligomers does not exceed a maximum value and/or the polyamide oligomers formed do not phase-separate or spontaneously crystallize in solid form, and continuous discharge of the polyamide oligomers from the oligomerization reactor. A polyamide oligomer preparable by this process can be provided continuously in a mixture with water in a process for preparing a semicrystalline or amorphous, thermoplastically processible polyamide and then postcondensed to give a polyamide. This polyamide can be used for production of moldings by means of injection molding, multicomponent injection molding, injection molding/welding, extrusion, coextrusion, blow molding or thermoforming.
本发明涉及一种连续制备聚酰胺低聚物的工艺。该工艺包括将聚酰胺形成单体的水溶液从储存容器连续输送到低聚反应器中,将水溶液加热至溶解或储存温度以上、限制单体溶液在低聚反应器中的停留时间,调节压力或水的部分蒸气压,使单体向聚酰胺低聚物的转化率不超过最大值和/或形成的聚酰胺低聚物不发生相分离或自发结晶成固体形式,并将聚酰胺低聚物从低聚反应器中连续排出。在制备半结晶或无定形、可热塑性加工的聚酰胺的工艺中,可在与水的混合物中连续提供通过该工艺制备的聚酰胺低聚物,然后进行后缩聚得到聚酰胺。这种聚酰胺可用于通过注塑、多组分注塑、注塑/焊接、挤出、共挤、吹塑或热成型等方法生产模塑件。