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    • 69. 发明公开
    • PROCESS FOR PRODUCING FLUOROELASTOMER
    • 生产氟橡胶的方法
    • EP0692501A1
    • 1996-01-17
    • EP94910534.0
    • 1994-03-25
    • E.I. DU PONT DE NEMOURS AND COMPANY
    • HAYASHI, KenichiHASHIMURA, KenzoKASAHARA, MichioIKEDA, Yukihiro
    • C08F214/22C08F2/18C08F4/34
    • C08F214/22
    • A process for producing a fluoroelastomer composed of vinylidene fluoride units and other fluoromonomer units copolymerizable therewith by suspension polymerization, which comprises: (1) dispersing the above monomers in 100 parts by weight of an aqueous medium containing 0.001-3 parts by weight of a suspension stabilizer, (2) using a polymerization initiator solution prepared by diluting 0.001-5 parts by weight of an oil-soluble organic peroxide in a concentration of 0.1-75 % by weight with a halogen-fee water-soluble hydrocarbon solvent represented by the general formula R-OH, R₂-COO-R₁ or R₁-CO-R₃ (wherein R₁ and R₃ represent each methyl or tert-butyl, and R₂ represents hydrogen, methyl or tert-butyl), and (3) conducting the suspension polymerization at 45-70 °C. The process provides a fluoroelastomer which has excellent resistances to heat, oil and chemical, a reduced compression set and a good releasability, and little stains a mold. Further it can dispense with the use of an ozonosphere-depleting chlorofluorocarbon solvent and facilitates the recovery of the monomers and solvent.
    • 一种由偏二氟乙烯单元和其它可与之共聚的含氟单体单元通过悬浮聚合制备氟弹性体的方法,该方法包括:(1)将上述单体分散在100重量份含0.001-3重量份悬浮液 (2)使用聚合引发剂溶液,所述聚合引发剂溶液通过将0.001-5重量份的油溶性有机过氧化物以0.1-75重量%的浓度用一般性表示的卤素水溶性烃溶剂 其中R 1和R 3分别代表甲基或叔丁基,R 2代表氢,甲基或叔丁基),和(3)在-78℃下进行悬浮聚合,其中R 1 -CO 2 -R 1或R 1 -CO- 45-70°C。 该方法提供了对热,油和化学品具有优异耐受性,降低的压缩形变和良好的可释放性,并且几乎不污染模具的含氟弹性体。 此外,它可以省去使用消耗臭氧层的氯氟烃溶剂并促进单体和溶剂的回收。