Ultramid B27 SD 02汽车领域的应用 耐油性能 热稳定性 PA6

 POM（聚甲醛树脂）：聚甲醛是一种没有侧链、高密度、高结晶性的线型聚合物。按其分子链中化学结构的不同，可分为均聚甲醛和共聚甲醛两种。两者的重要区别是：均聚甲醛密度、结晶度、熔点都高，但热稳定性差，加工温度范围窄（约10℃），对酸碱稳定性略低；而共聚甲醛密度、结晶度、熔点、强度都较低，但热稳定性好，不易分解，加工温度范围宽（约50℃），对酸碱稳定性较好。是具有优异的综合性能的工程塑料。有良好的物理、机械和化学性能，尤其是有优异的耐摩擦性能。俗称赛钢或夺钢，为第三大通用塑料。 适于制作减磨耐磨零件，传动零件，以及化工，仪表等零件。
合成树脂中的一种，又名聚甲醛树脂、POM塑料、赛钢料等；是一种白色或黑色塑料颗粒，具有高硬度、高钢性、高耐磨的特性。主要用于齿轮，轴承，汽车零部件、机床、仪表内件等起骨架作用的产品

POM性能特点 

1、POM为乳白色不透明结晶性线性热塑性树脂，具有良好的综合性能和着色性，具有较高的弹性模量，很高的刚性和硬度，比强度和比刚性接近于金属；

2、拉伸强度，弯曲强度，耐蠕变性和耐疲劳性优异，耐反复冲击，去载回复性优；

3、摩擦系数小，耐磨耗，尺寸稳定性好，表面光泽好，有较高的粘弹性，电绝缘性优，且不受温度影响；耐绝缘性好且不受湿度影响；

4、耐化学药品性优：除了强酸、酚类和有机卤化物外，对其他化学品稳定，耐油；机械性能受温度影响小，具有较高的热变形温度。

5、缺点是阻燃性较差，遇火徐徐燃烧，氧指数小，即使添加阻燃剂也得不到满意的要求，另外耐候性不理想，室外应用要添加稳定剂。

6、均聚甲醛结晶度高，机械强度、刚性、热变形温度等比共聚甲醛好，共聚甲醛熔点低，热稳定性，耐化学腐蚀性，流动特性，加工性均优于均聚甲醛，新开发的产品为超高流动（快速成型），耐冲击和降低模具沉积牌号，也有无机填充，增强牌号。

7、POM原料吸水率大于0.2%，成型前应预干燥，POM熔融温度与分解温度相近，成型性较差，可进行注塑、挤出、吹塑、滚塑、焊接、粘接、涂膜、印刷、电镀、机加工、注塑是最重要的加工方法，成型收缩率大，模具温度宜高些，或进行退火处理，或加入增强材料（如无碱玻璃纤维）。 
 应用领域 

POM原料强度高，质轻，常用来代替铜、锌、锡、铅等有色金属， 广泛用于工业机械、汽车、电子电器、日用品、管道及配件、精密仪器和建材等部门。

POM原料被广泛用于制造各种滑动、转动机械零件，做各种齿轮、杠杆、滑轮、链轮，特别适宜做轴承，热水阀门、精密计量阀、输送机的链环和辊子、流量计、汽车内外部把手、曲柄等车窗转动机械，油泵轴承座和叶轮燃气开关阀、电子开关零件、紧固体、接线柱镜面罩、电风扇零件、加热板、仪表钮 ；录音录像带的轴承 ；各种管道和农业喷灌系统以及阀门、喷头、水龙头、洗浴盆零件；开关键盘、按钮、音像带卷轴；温控定时器；动力工具，庭园整理工具零件；另外可作为冲浪板、帆船及各种雪撬零件，手表微型齿轮、体育用设备的框架辅件和背包用各种环扣、紧固件、拉链、扣环等

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