东莞市广裕塑胶原料有限公司
美国科慕PTFE 8A 良好的低温性能
Teflon? PTFE 8A X
聚四氟乙烯
DuPont Fluoropolymers
产品说明：
Teflon ? PTFE 8A X is a free-flowing white powder composed of relatively large particles. It has high bulk density and good powder flow. It's most unique features are improved moldability at lower pressure and improved surface smoothness of finished parts. The high bulk density and low compression ratio of Teflon? PTFE 8A X permit the use of shallow molds for small parts and complex shapes. Good powder flow is necessary for use in equipment that feeds resin automatically, and for filling deep and narrow molds that are pressed isostatically. Reduced pressure is an advantage for moldings with large surface area and for isostatic molding. Teflon ? PTFE 8A X is often preferred for molding thick sheets and for isostatic moldings. It is sometimes used for ram extrusion of rod and tubing with thicker cross sections. Properly processed products made from neat Teflon ? PTFE 8A X provide the superior properties typical of the fluoropolymer resins: retention of properties after service at 260 °C (500 °F), useful properties at -240 °C (-400 °F), chemical inertness to nearly all industrial chemicals and solvents, and low friction and antistick surfaces. Dielectric properties are outstanding and stable with frequency and temperature. Molded products have moderate stiffness and high ultimate elongation. In a flame situation, products of Teflon ? PTFE 8A X resist ignition and do not themselves promote flame spread. When ignited by flame from other sources, their contribution of heat is small and with very little smoke. Statements, or data, regarding behavior in a flame situation are not intended to reflect hazards presented by this or any other material when under actual fire conditions.
Typical Applications
Many end products are fabricated from moldings of Teflon ? PTFE 8A X, including small parts such as ball valve seats, seals, discs, and lab ware. Thick molded sheets are stock shapes made from Teflon ? PTFE 8A X. It is also chosen for lining pipes, valves, and valve plugs—and for ducting, expansion bellows, piston rings, and other large complex moldings.
Typical Applications
Many end products are fabricated from moldings of Teflon ? PTFE 8A X, including small parts such as ball valve seats, seals, discs, and lab ware. Thick molded sheets are stock shapes made from Teflon ? PTFE 8A X. It is also chosen for lining pipes, valves, and valve plugs—and for ducting, expansion bellows, piston rings, and other large complex moldings.
Teflon? PTFE 8A X 物性表
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| 特性 |
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| 用途 |
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| 机构评级 |
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| 外观 |
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| 形式 |
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| 加工方法 |
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| 物理性能 | 额定值 | 单位制 | 测试方法 |
|---|---|---|---|
| 比重 | 2.14 | g/cm3 | ASTM D4894 |
| 表观密度 | 0.68 | g/cm3 | ASTM D4894 |
| 收缩率 - 流动1 | 2.8 | % | ASTM D4894 |
| 平均颗粒尺寸 | 490 | μm | ASTM D4894 |
| 补充信息 | 额定值 | 单位制 | |
|---|---|---|---|
| Flowability2 | 221 | g/min |
| 机械性能 | 额定值 | 单位制 | 测试方法 |
|---|---|---|---|
| 抗张强度 | 41.4 | MPa | ASTM D4894 |
| 伸长率(断裂) | 330 | % | ASTM D4894 |
| 热性能 | 额定值 | 单位制 | 测试方法 |
|---|---|---|---|
| 熔融峰值温度 | ASTM D4894 | ||
| --3 | 317 到 337 | °C | ASTM D4894 |
| --4 | 332 到 352 | °C | ASTM D4894 |
PTFE:聚四氟乙烯（Teflon或PTFE），俗称“塑料王”，是由四氟乙烯经聚合而成的高分子化合物，具有优良的化学稳定性、耐腐蚀性、密封性、高润滑不粘性、电绝缘性和良好的抗老化耐力。用作工程塑料，可制成聚四氟乙烯管、棒、带、板、薄膜等。一般应用于性能要求较高的耐腐蚀的管道、容器、泵、阀以及制雷达、高频通讯器材、无线电器材等。
基本特点
耐高温——使用工作温度达250℃。
耐低温——具有良好的机械韧性；即使温度下降到-196℃，也可保持5%的伸长率。
耐腐蚀——对大多数化学药品和溶剂，表现出惰性、能耐强酸强碱、水和各种有机溶剂。
耐气候——有塑料中最佳的老化寿命。
高润滑——是固体材料中摩擦系数最低者。
不粘附——是固体材料中最小的表面张力，不粘附任何物质。聚四氟乙烯相对分子质量较大，低的为数十万，高的达一千万以上
聚四氟乙烯
聚四氟乙烯
，一般为数百万（聚合度在104数量级，而聚乙烯仅在103）。一般结晶度为90～95%，熔融温度为327～342℃。聚四氟乙烯分子中CF2单元按锯齿形状排列，由于氟原子半径较氢稍大，所以相邻的CF2单元不能完全按反式交叉取向，而是形成一个螺旋状的扭曲链，氟原子几乎覆盖了整个高分子链的表面。这种分子结构解释了聚四氟乙烯的各种性能。温度低于19℃时，形成13/6螺旋；在19℃发生相变，分子稍微解开，形成15/7螺旋。
虽然在全氟碳化合物中碳-碳键和碳-氟键的断裂需要分别吸收能量346.94和484.88kJ/mol，但聚四氟乙烯解聚生成1mol四氟乙烯仅需能量171.38kJ。所以在高温裂解时，聚四氟乙烯主要解聚为四氟乙烯。聚四氟乙烯在260、370和420℃时的失重速率（%）每小时分别为1×10-4．4×10-3和9×10-2。可见，聚四氟乙烯可在 260℃长期使用。由于高温裂解时还产生剧毒的副产物氟光气和全氟异丁烯等，所以要特别注意安全防护并防止聚四氟乙烯接触明火。
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