描述

改性聚甲醛塑料颗粒

1）聚甲醛20%玻璃纤维，具有优异的机械强度

2）POM 20%玻璃纤维，用于承载高硬度强度

3）POM 20%玻璃纤维，具有高耐磨性

4）轴承自润滑用POM 20%玻璃纤维

5）POM 20%玻璃纤维，用于承载更高的模量

6）POM 20%玻璃纤维，用于耐化学腐蚀等。

改性聚甲醛塑料颗粒

产品详细信息

改性POM塑料颗粒

POM（聚甲醛树脂）定义：POM是一种无侧链、高密度和高结晶度的线性聚合物。根据其分子链中化学结构的不同，可分为两类：均聚甲醛和共聚甲醛

两者之间的重要区别是：均聚甲醛具有高密度、结晶度和熔点，但热稳定性差，加工温度范围窄（约10°C），酸碱稳定性略低，熔点强度低，但热稳定性好，不易分解，加工温度范围宽（约50℃），耐酸碱稳定性好。是一种综合性能的工程塑料。它具有良好的物理、机械和化学性能，尤其是一些摩擦阻力性能，是一种大型通用塑料

主要用途：可代替钢、铜、铝、铸铁等制造各种结构件和电子产品中的各种结构件；耐磨和传动部件，如轴承凸轮、滚柱、滚柱、齿轮等。汽车仪表盘、化油器、各种仪表外壳盖、箱体、化学品容器、泵叶轮、风机叶片、配电盘、线圈座、各种油管、塑料弹簧等。

聚甲醛成型加工特性。流变学POM是熔融状态下的非牛顿流体。温度对POM的熔体粘度影响不大，因此不能通过提高温度来提高HPOM的流动性。剪切速率对聚甲醛熔体的粘度有很大影响

2。结晶度

聚甲醛一般结晶度为75%~80%。当聚甲醛熔化时，体积发生显著变化。因此，注射过程中必须有足够的保温时间来补偿凝固体积的变化，否则会出现缩孔。因此，一般产品的短保持时间可以通过测量闸门密封时间来确定：通过称量不同保持压力时间下获得的产品，可以确定闸门密封时间

3。热稳定性

聚甲醛的热稳定性较差。在保证流动性的前提下，加工温度应尽可能低，加热时间应尽可能短

4。吸湿性

聚甲醛的吸湿性很小，一般为0.2%到0.25%

5。收缩率聚甲醛的收缩率相对较大，从1.5%到3.5%不等。低气味

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Modified POM Plastic Granules

1)POM 20% Glass Fiber for Bearing Excellent mechanical strength;
2)POM 20% Glass Fiber for Bearing High hardness strength;
3)POM 20% Glass Fiber for Bearing High wear resistance;
4)POM 20% Glass Fiber for Bearing Self-lubrication;
5)POM 20% Glass Fiber for Bearing Higher modulus;
6)POM 20% Glass Fiber for Bearing Chemical resistance and etc.

Modified POM Plastic Granules

Product Details

Modified POM Plastic Granules

POM (Polyoxymethylene resin) Definition: POM is a linear polymer with no side chains, high density and high crystallinity. According to the different chemical structures in its molecular chain, it can be divided into two types: homopolyoxymethylene and copolyoxymethylene.

The important difference between the two is: homopolyoxymethylene has high density, crystallinity and melting point, but poor thermal stability, narrow processing temperature range (about 10°C), and slightly lower acid-base stability; , melting point strength are low, but good thermal stability, not easy to decompose, wide processing temperature range (about 50 ° C), good stability to acid and alkali. It is an engineering plastic with comprehensive properties. It has good physical, mechanical and chemical properties, especially some friction resistance properties, and is a large general-purpose plastic.

Main use: It can replace steel, copper, aluminum, cast iron, etc. to manufacture various structural parts and various structural parts in electronic products; wear-resistant and transmission parts such as bearing cams, rollers, rollers, gears, etc. Automobile dashboards, carburetors, various instrument housing covers, boxes, chemical containers, pump impellers, blower blades, switchboards, coil seats, various oil pipes, plastic springs, etc.

POM molding processing characteristics

1. Rheology

POM is a non-Newtonian fluid in the molten state. Temperature has little effect on the melt viscosity of POM, so the fluidity of HPOM cannot be increased by increasing the temperature. The shear rate has a great influence on the viscosity of POM melt.

2. Crystallinity

POM-general crystallinity is 75% ~ 80%. When the polyoxymethylene melts, there is a significant volume change. Therefore, there must be sufficient holding time during injection to compensate for the volume change of solidification, otherwise shrinkage cavities will appear. Therefore, the short holding time for general products can be determined by the measurement of the gate sealing time: by weighing the products obtained with different holding pressure times, the gate sealing time can be determined.

3. Thermal stability

Polyoxymethylene has poor thermal stability. On the premise of ensuring fluidity, the processing temperature should be as low as possible, and the heating time should be as short as possible.

4. Hygroscopicity

The hygroscopicity of polyoxymethylene is small, generally 0.2% to 0.25%.

5. Shrinkage

The shrinkage rate of polyoxymethylene is relatively large, ranging from 1.5% to 3.5%. Low odor.

Contactnowformoredetailsabout Modified POM Plastic Granules.

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