其一，原料端政策管控壁垒。生产PVDF的关键单体R142b，受《蒙特利尔议定书》及国内产业政策管控，仅10余家企业拥有合法生产配额，配额稀缺导致原料供给受限，新进入者无法获得核心生产原料，丧失入场基础。
A rising number of US airports are asking for donations to support employees affected by the partial government shutdown with airport security officials missing their first full paychecks Friday.。易歪歪官网对此有专业解读
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