Inquiry

“Super” plastic – the development of ultra high polymer polyethylene

“Noble in Plastics” – Ultra High Molecular Weight Polyethylene (UHMWPE). This is a linear structure with excellent overall performance of the thermoplastic engineering plastics, the general molecular weight of more than 1.5 million, with other plastic unmatched wear, impact resistance, corrosion resistance, low temperature, self-lubricating, absorbing impact energy, health Non-toxic and other comprehensive performance.

Thermoplastics

1, melt characteristics

Although UHMWPE is a thermoplastic, but because of its molecular weight is too high, when the performance of the melt and the general thermoplastics are different, it can not be processed by conventional processing methods.

① UMWMWPE melt for the rubber state of high elasticity, viscosity is very large, poor processing fluidity.

②UMWMWPE has a lower critical shear rate, at a lower shear rate, it will produce slip flow or jet phenomenon; injection prone to jet products to produce porous or delamination phenomenon.

③ friction factor is small, the feeding process in the feeding section easy to slip, can not move forward.

Thermoplastic - Ultra High Molecular Weight Polyethylene (UHMWPE)

2, forming methods

Due to the characteristics of UHMWPE, UHMWPE is widely used to limit the application. However, in recent years, UHMWPE processing technology has been the rapid development of the initial molding from the development of extrusion, blow molding and injection molding and other special methods of multi-branch molding method.

① molding: the oldest plastic molding methods, characterized by: low cost, simple equipment, less investment, not subject to the processing of plastic molecular weight constraints; drawbacks are: low production efficiency, labor intensity, prone to oxidation and degradation, product Quality instability and so on. According to the specific process differences are divided into: pressing – sintering – pressing method, sintering – pressing method, pressing sintering at the same time, rapid heating method.

② Extrusion molding: Extrusion molding equipment are mainly plunger extruder, single screw extruder and twin screw extruder. Which with the same twin screw extruder is better.

③ injection molding: UHMWPE single screw injection molding process is mainly through the high-speed shear material dispersion evenly, and full of cavity. While the general plastic injection is molten fluid.

④ blow molding: UHMWPE blow molding is mainly used for large hollow products, such as car fuel tanks, tubes and so on.

⑤ other molding methods: UHMWPE other special molding methods are: jelly spinning, stamping, rolling molding, forging forming, welding and so on.

Thermoplastic - polymer materials

3, UHMWPE products recycling methods

As a result of UHMWPE ultra-high mechanical properties and ease of processing, UHMWPE products recycling has also become an important problem. And even some waste stations directly refuse to recover this product.

① grinding method: the UHMWPE products broken through the granulator or other equipment made of powder, and then use.

② shear tear method: for some fiber products, the fiber can be cut, cut directly after the application.

Plastic material - polymer thermoplastic

4、UHMWPE的应用

①超高分子量聚乙烯广泛应用在装煤、石灰、水泥、矿粉、盐、谷物等等粉状文件的拖斗、料仓、滑槽的衬里;

②在国防军需装备方面,大量用作防护衣料、头盔、防弹材料;

③在航天工程中,可以用作航天飞机着陆的减速降落伞和飞机上悬吊重物的绳索,取代了传统的钢缆绳和合成纤维绳索,其发展速度异常迅速;

④在民用领域,制成的绳索、缆绳、船帆和渔具适用于海洋工程;

⑤在工业应用中,可用作耐压容器、传送带、过滤材料、汽车缓冲板等;建筑方面可以用作墙体、隔板结构等;

⑥在体育用品上已经制成安全帽、滑雪板、帆轮板、钓竿、球拍及自行车、滑翔板、超轻量飞机零部件等;

⑦在医学方面,用于牙托材料、医用移植物和整形缝合等领域,它的生物相容性和耐久性都较好,并具有高的稳定性,不会引起过敏,已作临床应用。

Application of ultra - high molecular weight polyethylene plastic materials


Post time: Sep-13-2017
INQUIRY NOW
  • * CAPTCHA: Please select the Tree