Overview
Polyolefins are the most widely produced plastics globally, accounting for over half of total thermoplastic demand. Derived from petroleum or natural gas, they are synthesized via polymerization of olefins like ethylene or propylene. Their popularity stems from a balance of mechanical properties, processability, and low cost. Common types include polyethylene (PE) and polypropylene (PP), each with subtypes like HDPE, LDPE, and LLDPE for PE, or homopolymer and copolymer for PP. Innovations in catalyst technologies (e.g., Ziegler-Natta, metallocene) have expanded their performance range.
Physical and Chemical Properties
Polyolefins exhibit low density, making them lightweight yet durable. They resist water, acids, alkalis, and most solvents, though they can swell in hydrocarbons. Their semi-crystalline structure provides good tensile strength and impact resistance, adjustable via copolymerization or additives. Thermal properties vary: PE softens at ~80–120°C, while PP withstands up to ~160°C. UV stabilizers are often added for outdoor use. Electrical insulation properties make them ideal for wire coatings.
Main Applications
In packaging, polyolefins dominate films, bottles, and containers due to their moisture barrier and flexibility. HDPE is used for rigid containers, while LLDPE excels in stretch films. PP is preferred for microwave-safe containers and synthetic fibers. Automotive applications include bumpers, dashboards, and battery casings. In construction, PE pipes and PP geotextiles are common. Medical uses range from syringes to surgical mesh, requiring high-purity grades.
Safety and Storage
Polyolefins are generally non-toxic and FDA-approved for food contact. However, additives (e.g., plasticizers, flame retardants) may require evaluation. Melting or burning releases volatile compounds; adequate ventilation is essential. Store pellets or sheets in dry conditions below 40°C to prevent clumping. Avoid prolonged UV exposure to prevent degradation. Recycled grades should be checked for contaminant levels.
B2B Procurement Guide
For bulk procurement, specify parameters like melt flow index (MFI), density, and additive package (e.g., anti-static, UV-resistant). Verify certifications (ISO, FDA) for specialized applications. Supplier audits are recommended to ensure consistent quality. Prices fluctuate with crude oil trends. Long-term contracts may mitigate volatility. Consider regional logistics; some grades are produced locally, while specialty types may require imports.
Related Manufacturers
- 主营：液体橡胶、塑料增韧剂、相容剂、聚丁二烯橡胶RB系列、可发性聚苯乙烯EPS、溶剂型TPU、橡胶粉末、英全SBS、改性TPU
- 主营：胶黏剂、增硬剂、接枝料、新加坡聚烯径、通用料、液体橡胶、相容剂、pa尼龙粉、溶剂型TPU、透明Tpu
- 主营：液体橡胶、橡胶粉末、塑料粉末、新加坡聚烯径、改性助剂、接枝料、工程塑料、通用塑料
- 主营：化学abs、韧性abs、催化剂、共聚物、聚酰胺、聚苯醚、低翘曲、高耐热、电池盒、电池板、太空杯、空针筒、安全帽、玻璃珠、波形板、密封圈、韧性线、tpv原料、自润滑、做齿轮、纤尼龙、拉杆箱、增强pa6、口罩料、排水管
- 主营：淋膜专用填充料、塑料干燥剂、白色母、透明填充料、高添加塑料填充、膜类填充料、高速吹膜料
- 主营：POF热收缩膜、PE热收缩膜、BOPP三维包装膜、PVC热收缩膜
- 主营：连胶条卡箍、浸塑管夹、包胶管夹线夹、低烟无卤聚烯径包覆管、卡圈紧固夹、浸胶卡箍喉箍、双管管夹、双管夹片、一字线夹、线束固定夹、不锈钢固定夹、不锈钢穿线金属波软管、包塑金属软管、锌合金镀锌接头、包塑穿线蛇皮管、不锈钢穿线软管接头、光纤保护管、双扣金属软管、金属电缆防水接头、锁紧金属软管电缆接头、金属电缆填料函、电缆防水密封格兰头、双拼波纹管及接头、包胶骑马夹、开口塑料波纹管、尼龙波纹管快插接头
- 主营：消泡剂、手感剂、流平剂、成核剂、湿润分散剂、表面活性剂、光稳定剂、紫外线吸收剂、偶联剂、固化剂、附着力促进剂、抗静电剂、扩链剂、光扩散剂、增韧剂、光引发剂、催干剂、涂料助剂、塑料助剂
- 主营：阻燃剂、胶黏剂、群青紫、苯乙烯、黑色粉、氧化剂、颜料浆、润滑油、成核剂、电子胶、胶粘剂、增韧剂、抗氧剂、真空泵、静电剂、纽碧莱、蜡助剂、脱模胶、润滑剂、材级pvc、爽滑剂、铁氟龙、润湿剂、抗菌剂、美缝剂