| 摘要 |
PURPOSE:To provide polyvinylidene fluoride resin pipe having superb folding fatigue strength and workability which consists of polyvinylidene fluoride resin having higher specific viscosity than a specific value and polyvinylidene fluoride having a lower specific viscosity than a specific value. CONSTITUTION:PVDE pipe having superb folding fatigue strength and workability which consists of 99-40wt%, preferably 90-70% of polyvinilydene fluoride resin having more than 1.30dl/g, preferably 1.50-3.00dl/g of ninh and 1-60%, preferably 10-30% of polyvinylidene fluoride containing less than 1.20dl/g, preferably 0.60-1.10dl/g. If the weight percentage of polyvinilydene fluoride containing more than 1.30dl/g of ninh is beyond the afore-mentioned range, extrusion workability, specially plane smoothenss deteriorates. Contrarily if the said percentage is below the mentioned range, folding fatigue strength does not show improvement which is not desirable. |
