美国苏威PVDF 1010 食品医疗包装膜应用PVDF
UNINAR PVDF (POLYVINYLIDENE FLUORIDE) is a non-reinforced highly crystalline fluoropolymer that combines exceptional chemical resistance with superior strength and stability. When compared with traditional fluoropolymers like PTFE, UNINAR PVDF offers up to three times the typical strength and stiffness while maintaining unparalleled resistance to even the harshest chemicals—even at temperatures up to 300°F. These properties, along with its natural flame retardency (UL94, V-0) and ultrahigh purity have made it the material of choice for processing e components used in semiconductor manufacturing clean room environments. Because it also offers excellent toughness and electrical properties that remain stable over a wide range of both fre and temperatures, UNINAR PVDF is also often used in components used for power transmission. UNINAR PVDF is offered in two grades; UNINAR 740 (beige) and UNINAR 1010 (white). Both grades machine easily and are available from Nytef Plastics in a full range of heavy gauge rod, plate, and tubular bar sizes.UNINAR PVDF ATTRIBUTES
300°F continuous use temperature
Excellent balance of strength, toughness and abrasion resistance
Resistant to virtually all chemicals and solvents
Extremely low moisture absorption
Low permeability to gases liquids
Excellent UV nuclear radiation resistance
Flame resistant -UL 94 V-0 rated
Easily machined and fabricated
TYPICAL INDUSTRIES
Chemical
Pulp and paper processing
Food processing e
Electrical and electronics products
Semiconductor manufacturing
Petroleum processing
APPLICATIONS
Pump components
Manifolds and valves
Fluid sensors
Liquid chromatography components
Analytical instruments
Bearings and bushings
美国苏威PVDF 1010 食品医疗包装膜应用PVDF
聚偏二氟乙烯,简称PVDF,是一种高度非反应性热塑性含氟聚合物。其可通过1,1-二氟乙烯的聚合反应合成。溶于二甲基乙酰胺等强极性溶剂。抗老化、耐化学药品、耐气候、耐紫外光辐射等性能优良。可用作工程塑料,用于制密封圈耐腐蚀设备、电容器,也用作涂料、绝缘材料和离子交换膜材料等
物理性质
PVDF主要用于对纯度有极高要求,同时需要抗溶剂及酸碱腐蚀的场合。比起其他含氟聚合物,比如聚四氟乙烯,PVDF的密度较低(1.78g/cm)。
PVDF可用于生产管材、板材、薄膜、基板以及线缆的绝缘外皮。同时,其还可进行注射成型或焊接,广泛用于化工、半导体、制药以及国防工业,比如它可以用于制造锂离子电池。此外,它还可以制成交叉链接闭孔泡沫,在航空航天领域应用日益广泛。
精细粉末品级的PVDF,如KYNAR 500 PVDF以及HYLAR 5000 PVDF,可以用于制造高端金属涂料。这种涂料具有极高的光泽度以及色泽稳定性。在许多建筑中,比如双峰塔,台北101,都可以发现这种涂料的身影。商用建筑以及住宅的铺金属屋面也可用到这种涂料。
由于PVDF薄膜对于氨基酸具有非特异亲和性,因而其可以在Western印迹法检测中用于固定蛋白质。
1969年,研究人员发现PVDF具有较强的压电效应:极化(即放入强电场产生净偶极矩)薄膜的压电系数为6-7pC/N,比当时已发现的聚合物的相应数值大10倍以上。
PVDF的玻璃转化温度(Tg)约为?35°C,结晶度通常为50–60%。为了赋予材料压电特性,材料通常会先沿着分子链的方向被机械拉伸,再在张力下进行极化。PVDF有多种固态相:α相(TGTG")、β相(TTTT)以及γ相(TTTGTTTG")。这几种相的差别在于分子链是顺式(T)的还是反式(G)的。PVDF在极化后会成为铁电聚合物,具有良好的压电性与热释电性。这些性质令其可以用于生产传感器与电池,比如一些新型的热图摄影机的传感器就用到了PVDF薄膜。 [2]
与一些其他的压电材料,如PZT,不同,PVDF的d33值是负的。从物理意义的角度上说,这一点意味着,当其他材料在电场中膨胀时,PVDF则会收缩,反之亦然。
电晕处理後还必须进行温度控制,以便於基料输送,避免形成皱折和缺陷。同时,必须妥善设计成卷机,才能确保材料准确成卷,否则,材料老化後会收缩,易於在多层薄膜生产时粘连或印迹扩散。CPP卷材通过气隙模式成卷。空气量由“夹定齿轮”的设计和可调性决定,夹定齿轮对薄膜边缘进行调整,便於空气夹入。同时,还应采用送膜辊,以便更加**地控制卷材硬度。