赛钢（POM）是什么材料？具有哪些特性
齿轮、连杆等用什么塑料材料合适。？
1. POM的性能 ，POM是结晶型塑料，它的钢性很好，俗称“赛钢”。POM是一种坚韧有弹性的材料，即使在低温下仍有很好的抗蠕变特性、几何稳定性和抗冲击特性，它具有耐疲劳性、耐蠕变性、耐磨性、耐热性等优良的性能。
POM不易吸湿，比重为1.42g/cm3，收缩率2.1%（POM的高结晶程度导致它有相当高的收缩率，可高达到2%~3.5%，较大，对于各种不同的增强型材料有不同的收缩率），尺寸难控制，热变形温度为172℃。POM既有均聚物材料也有共聚物材料。
2.POM的工艺特点
POM加工前可不用干燥，好在加工过程中预热（100℃左右），对产品尺寸的稳定性有好处。POM的加工温度范围很窄（195-215℃），在炮筒内停留时间稍长或温度超过220℃就会分解（均聚物材料为190~230℃；共聚物材料为190~210℃）。螺杆转速不能过高，残量要少。
POM产品收缩大（为了减小成型后收缩率可选用高一些的模具温度），易产生缩水或变形。POM比热大，模温高（80-105℃），产品脱模后很烫，需防止烫伤手指。注射压力700~1200bar，POM宜在中压、中速、高模温条件下成型加工。
流道和浇口可以使用任何类型的浇口。如果使用隧道形浇口，则好使用较短的类型。对于均聚物材料建议使用热注嘴流道。对于共聚物材料既可使用内部的热流道也可使用外部热流道。
3.典型应用范围:
POM具有很低的摩擦系数和很好的几何稳定性，特别适合于制作齿轮和轴承。由于它还具有耐高温特性，因此还用于管道器件（管道阀门、泵壳体）。
CELCON®MC270-HM CB34353 SAND
CELCON®MC270-HM CB34787 IVORY
CELCON®MC270-HM CC34821 DARK GRAY
CELCON®MC270-HM CD3501 BLACK
CELCON®MC270-HM CF3500 NATURAL
CELCONMC270-HM | POM | Mineral Reinforced
Description
Celcon®MC270-HM is a high modulus, mineral coupled acetal copolymer. Itutilizes a higher additive level to provide significant improvementin product stiffness and mold shrinkage and better warpageresistance than unfilled Celcon® M270. Celcon® MC270-HM isformulated to produce very flat, dimensionally stableparts.
OtherProcessing
InjectionMolding
Standardreciprocating screw injection molding machines with a highcompression screw (minimum 3:1 and preferably 4:1) and low backpressure (0.35 Mpa/50 PSI) are favored. Using a low compressionscrew (I.E. general purpose 2:1 compression ratio) can result inunmelted particles and poor melt homogeneity. Using a high backpressure to make up for a low compression ratio may lead toexcessive shear heating and deterioration of thematerial.
MeltTemperature: Preferred range 182-199℃ (360-390℉).Melt temperature should never exceed 230℃ (450℉).
MoldSurface Temperature: Preferred range 82-93℃ (180-200℉)especially with wall thickness less than 1.5 mm (0.060 in.). Mayrequire mold temperature as high as 120℃(250℉)to reproduce mold surface or to assure minimal molded in stress.Wall thickness greater than 3mm (1/8 in.) may use a cooler(65℃/150℉)mold surface temperature and wall thickness over 6mm (1/4 in.) mayuse a cold mold surface down to 25℃ (80℉).In general, mold surface temperatures lower than82℃ (180℉)may hinder weld line formation and produce a hazy surface or asurface with flow lines, pits and other included defects that canhinder part performance.
ISOData | Mechanicalproperties | Value | Unit | TestStandard |
Phys | Density | 1570 | kg/m³ | ISO1183 |
Moldshrinkage - parallel | 1.5 | % | ISO294-4 | |
Moldshrinkage - normal | 1.3 | |||
Waterabsorption (23℃-sat) | 0.75 | ISO62 | ||
Humidityabsorption (23℃/50%RH) | 0.2 | |||
Mech | Mechanicalproperties | Value | Unit | TestStandard |
Tensilemodulus (1mm/min) | 3750 | MPa | ISO527-2/1A | |
Tensilestress at yield (50mm/min) | 45 | |||
Tensilestrain at yield (50mm/min) | 5 | |||
Flexuralmodulus (23℃) | 3700 | ISO178 | ||
Flexuralstrength (23℃) | 77 | |||
Charpynotched impact strength @ 23℃ | 4.8 | kJ/m² | ISO179/1eA | |
Charpynotched impact strength @ -30℃ | 3.5 | |||
Notchedimpact strength (Izod) @ 23℃ | 5.3 | ISO180/1A | ||
Therm | Thermalproperties | |||
Meltingtemperature (10℃/min) | 165 | ℃ | ISO11357-1,-2,-3 | |
DTUL@ 1.8 MPa | 105 | ISO75-1/-2 | ||
Coeff.oflinear therm. expansion (parallel) | 0.6 | E-4/℃ | ISO11359-2 | |
Coeff.oflinear therm. expansion (normal) | 0.9 | |||
SpecProd | Testspecimen production | |||
Processingconditions acc. ISO | 9988-2 | - | Internal |
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