Overview
Polyurethane chain extenders are low-molecular-weight diols or diamines used to bridge polyurethane prepolymers during synthesis. They play a critical role in determining the final polymer's mechanical properties, such as hardness, elasticity, and thermal stability. Imported variants, often from Germany or the U.S., are preferred for high-precision applications due to stringent quality control. Common types include 1,4-butanediol (BDO), ethylene glycol, and aromatic extenders like MOCA. These are widely used in industries requiring durable polyurethane products, such as automotive, construction, and textiles. The choice of extender depends on the desired balance between flexibility and strength.
Physical and Chemical Properties
Chain extenders typically exhibit low viscosity and high reactivity with isocyanate groups. For example, 1,4-BDO has a molecular weight of 90.12 g/mol, a boiling point of 230°C, and full water solubility. Aromatic extenders like MOCA offer higher heat resistance but may pose greater handling risks. Density ranges from 1.02 to 1.25 g/cm³, and melting points vary widely; some are liquid at room temperature, while others are solids. Solubility in polar solvents like ethanol and acetone makes them easy to incorporate into polymer systems. Storage requires moisture-proof containers to prevent hydrolysis.
Main Applications
In elastomer production, chain extenders create segmented polyurethanes for shoe soles, seals, and industrial rollers. They improve rebound resilience and abrasion resistance. For adhesives and coatings, they enhance bonding strength and curing speed. The automotive sector relies on extended PU for suspension bushings and interior panels. High-performance variants are used in medical devices and aerospace composites. Specialty extenders with flame-retardant properties are critical in construction materials.
Safety and Storage
Most chain extenders are classified as irritants (H315/H319) and require gloves and goggles. Aromatic types like MOCA may carry carcinogenicity warnings (e.g., H351). Ensure adequate ventilation during handling. Store in sealed containers below 25°C, away from oxidizers. Shelf life is typically 1–2 years. Spills should be contained with inert absorbents and disposed of as hazardous waste. Always consult SDS before use.
B2B Procurement Guide
When sourcing imported chain extenders, prioritize suppliers with ISO 9001 certification and batch-specific COAs. Key parameters to verify include purity (≥99%), water content (<0.1%), and heavy metal limits. Prices vary by volume; bulk orders (1+ metric tons) often reduce costs by 15–20%. Logistics should ensure temperature-controlled transport for heat-sensitive grades. Sample testing is recommended to confirm compatibility with your PU formulation.
Related Manufacturers
- 主营：泡沫箱、阻燃剂、胶黏剂、扩链剂、热熔胶、催化剂、电子材、哑光粉、涂料的、热溶胶、消除剂、荧光粉、锤纹剂、防冻剂、纤维素、消光剂、清洗剂、合板胶、印光油、滑雪靴、缓蚀剂、糊树脂、展渗剂、色浆红、脂肪醇、除味剂
- 主营：surlyn、pvdf、PA66、BASF巴斯夫扩链剂ADR、ABS、PFA、ptfe
- 主营：甜菊糖、甘氨酸、cmc淀粉、扩链剂、阿力甜、栀子红、胺鲜酯、柠檬油、韦兰胶、可可壳、增稠剂、海藻糖、辣椒精、姜精油、独活油、川芎油、海松素、软明胶、酪蛋白、麦芽粉、玉米肽、果乳糖、乳制品、龙脑油、牛磺酸、磷酸铁
- 主营：260号溶剂油、二甲硫基甲苯二铵、二乙基甲苯二铵、聚氨酯橡胶硫化剂、硅油、二月桂酸二丁基锡、丙二醇、甘油丙三醇、对甲苯磺酰氯、聚乙二醇、丙二醇丁醚、乙二醇丁醚、乙酯、二甲苯、硫酸镍、氯化镍、氯化锌、溶剂油120号/150号/200号、D系列溶剂油D40/D60/D80、环保溶剂油D100/D110/D130、磺化煤油、莫卡/橡胶硫化剂
- 主营：回收油漆、回收树脂、回收橡胶助剂、扩链剂、回收油漆厂原料、回收橡胶、回收香精、回收热熔胶
- 主营：回收聚醚多元醇、回收热熔胶、回收石蜡、回收聚氨酯黑白料、回收香精、回收化工原料、回收日化原料、回收化妆品原料、回收塑料助剂、回收过期油墨、回收过期油漆、回收胶印油墨、回收树脂、回收异氰酸酯、回收MDI、回收三氧化二锑、回收氧化锌、回收抗氧剂、回收钛白粉、回收船舶油漆、回收防污漆、回收荧光增白剂、回收二甲基硅油、回收二甲基亚砜、回收硫酸亚锡
- 主营：润滑油、氯化铵、磷酸二氢钾、扩链剂、白油、减水剂、氯化钾、乙二醇、柠檬酸、辛醇
- 主营：eaa、ema、沙林树脂、扩链剂、eea、eba
- 主营：扩链剂、防螨助剂、树脂油墨稀释剂
- 主营：四氢噻吩、二甲基二硫、一乙醇胺、扩链剂、异辛醇、环丁砜、二甲基亚砜、异丙醚、环己酮、异辛烷、氟硼酸、三乙胺、正庚烷、燕化苯酚、马来酸酐、三乙醇胺、亚硝酸钠、鲁西甲酸、三氧化二锑、3-乙氧基丙胺
- 主营：漂白粉、茶皂素、噻霉酮、扩链剂、浮选油、草酸铵、戊二醛、苯甲醇、磺化油、漂粉精、氟化钠、三甘醇、碳酸钙、白僵菌、松醇油、碳酸钡、黄糊精、雷米邦a、号全精炼、杀菌剂bit、三乙醇胺、牛骨发酵、快干水泥、多聚甲醛、次氯酸钠、羟基乙叉
- 主营：全氟聚醚二醇、全氟三丁胺、聚硅氮烷、扩链剂HQEE、特种硅油、特种硅树脂
- 主营：阻燃剂、催化剂、水杨酸、扩链剂、二苯基、酰亚胺、正磷酸、烟酰胺、曲酸粉、氯化锌、异丙醇、化妆品、初油酸、脂肪醇、生石灰、甲基异、碳酸锌、碳酸锂、活性炭、乙二胺、三氮唑、着色剂、环己酮、防冻液、抗氧剂、亚磷酸
- 主营：甲基丙烯酸十二酯、甲基丙烯酸十六酯、甲基丙烯酸十八酯、扩链剂MOEA、丙烯酸十二酯、丙烯酸十六酯、丙烯酸十八酯、V50引发剂、偶氮二异丁咪唑啉盐酸盐、N-乙酰己内酰胺、硅烷偶联剂、双马来酰亚胺、马来酸酯、缩水甘油酯、缩水甘油醚、甲基咪唑、N-异丙基丙烯酰胺、金属萃取剂
- 主营：扩链剂MOEA、全氟三丁胺、木质素、吉氏色素
- 主营：离子液体、5-二甲基吡唑、咪唑、扩链剂、催化剂、阻燃剂、正丁醇锆、四氟硼酸锂、香兰基丁醚、氟化物、全氟辛基三甲氧基硅烷、丙酮肟、双酚E型氰酸酯、叔丁基乙烯基醚、钯碳催化剂、钛硅分子筛、硫酸烟酰苯胺、丙酮缩氨基硫脲