Overview
Isocyanates are organic compounds characterized by the functional group -N=C=O. They are pivotal in industrial chemistry, primarily serving as precursors to polyurethanes. The most common types include toluene diisocyanate (TDI) and methylene diphenyl diisocyanate (MDI), which account for over 90% of global production. These compounds are manufactured through phosgenation of amines or non-phosgene routes. Their high reactivity with hydroxyl groups (e.g., in polyols) enables the formation of urethane linkages, making them indispensable in polymer industries. Global production exceeds 8 million metric tons annually, driven by demand from construction, automotive, and furniture sectors.
Physical and Chemical Properties
Isocyanates exhibit low to moderate volatility, with viscosities ranging from 1-200 cP at room temperature. Their reactivity stems from the electrophilic carbon in the -N=C=O group, which readily undergoes addition reactions with nucleophiles like water, alcohols, and amines. Key hazards include respiratory sensitization and skin irritation. For instance, TDI has a pungent odor and a threshold limit value (TLV) of 5 ppb due to its toxicity. Storage stability depends on excluding moisture; hydrolysis generates CO₂ and amines, potentially causing pressure buildup in containers.
Main Applications
1. **Flexible Foams**: TDI-based foams dominate mattress and upholstery production (60% of TDI demand). 2. **Rigid Foams**: MDI is used for insulation panels in construction (thermal conductivity: 0.020-0.025 W/m·K). 3. **Coatings**: Aliphatic isocyanates (e.g., HDI) provide weather-resistant finishes for automotive paints. 4. **Adhesives**: Moisture-curing polyurethane adhesives leverage isocyanate reactivity with ambient humidity. Emerging applications include 3D printing resins and biomedical materials, though these account for <5% of current usage.
Safety and Storage
Isocyanates require strict handling protocols: - **PPE**: Respirators (NIOSH-approved), nitrile gloves, and chemical goggles. - **Ventilation**: Local exhaust ventilation (LEV) systems to maintain airborne levels below OSHA PELs (e.g., 0.02 mg/m³ for MDI). - **Spill Control**: Absorb with inert materials (vermiculite) and neutralize with ammonia solution. Storage tanks should be nitrogen-purged to prevent moisture ingress. Shelf life typically ranges 6-12 months in sealed drums at <25°C.
B2B Procurement Guide
1. **Specifications**: Demand certificates of analysis (CoA) for purity (>99.5%), hydrolyzable chlorine (<0.1%), and acidity. 2. **Logistics**: Prefer ISO tank containers for bulk shipments (20-25 tons) to reduce contamination risks. 3. **Suppliers**: Major producers include BASF, Covestro, and Wanhua Chemical (80% of global MDI capacity). 4. **Regulations**: Ensure compliance with REACH, TSCA, and local emission standards (e.g., Germany's TRGS 430). Spot prices fluctuate with crude oil trends (benzene feedstock) and seasonal demand (Q4 peak for insulation).
Related Manufacturers
- 主营：三硫代碳酸钠、聚乙烯亚胺、三甘醇二异辛酸酯、萘二异氰酸酯、热敏染料、聚己内酯PCL、烯丙基二甘醇二碳酸酯
- 主营：羟甲基脲、溴化钾
- 主营：碘海醇、葡甲胺、氨甲环酸、盐酸柔红霉素、甘油磷酸钠、海藻糖、葡乙胺、古龙酸、托吡酯、潮霉素B、替卡西林钠克拉维酸钾、星孢菌素、盐酸阿霉素、碘帕醇
- 主营：涂料助剂、工业清洗剂、表面活性剂、异佛尔酮二异氰酸酯、合成材料助剂、合成香料、溶剂、香精和香料中间体、合成材料中间体、炼厂助剂、选矿药剂
- 主营：双盐酸肼、5-二甲基海因
- 主营：回收减水剂、回收化学试剂、回收食品添加剂、回收化工原料、回收化工溶剂、回收硅油、回收聚羧酸母液
- 主营：回收油漆、回收染料、回收树脂、全国回收异氰酸酯、回收机油、回收橡胶、回收助剂
- 主营：回收mdi、回收hdi、回收热熔胶、回收化妆品原料、异氰酸酯回收、收购过期化工原料、回收环氧树脂、回收碳酸锂、回收氯化锂、回收聚醚多元醇、回收锆珠、回收丙烯酸树脂、回收石蜡、回收导热油、回收过期油漆、回收油墨、回收香精、回收萜烯树脂、回收橡胶助剂、回收塑料助剂、回收食品添加剂、回收甘油、回收硅油、溶剂回收
- 主营：四氢噻吩、三甲基戊烷、乙硫醇、二甲基亚砜、氧化三甲胺、环丁砜、正己烯、单氰胺、氟硅酸、氯乙酸、氯乙酸钠、叔丁硫醇、对叔丁基邻苯二酚、氟硼酸、溶剂油、乙硫氨酯、苯扎溴铵、三聚氯氰、亚磷酸三苯酯、对氟苯胺、正己烷、邻苯基苯酚、苯酚、叔十二硫醇、二甲基二硫醚
- 主营：回收化工原料厂家批发、染料回收、回收颜料
- 主营：十八醇、十六酸、脂肪酸、脂肪族聚异氰酸酯、月桂酸、丙三醇、十八酸、棕榈酸、硬脂酸、十二酸、瓜尔胶、脂肪粉、甘油、肉豆蔻酸、十二醇、十六醇、十六十八醇、硅油、丙二醇、鲸蜡硬脂醇
- 主营：回收羟丙基甲基纤维素、回收颜料色粉、回收合成橡胶、回收洗涤剂原料、回收PVA聚乙烯醇、回收MDI、回收聚醚多元醇、回收环氧树脂、回收聚氯乙烯糊树脂、回收酚醛树脂、回收橡胶色胶、收购受潮钛白粉、氧化锌回收、油漆回收
- 主营：四氢噻吩、乙硫醇、单氰胺、二甲基二硫醚、3-甲硫基丙醛、四氢吡咯、邻氯苯腈、噻吩、盐酸羟胺、硬脂酸锌、异丙胺、氯乙酸、氟硼酸
- 主营：聚苯胺、脯氨酸甲酯盐酸盐、苄基三甲基氯化铵
- 主营：定香剂、氧化铅、浮选油、氧化铋、氟化铝、氟化镁、洗涤剂、异丙醇、漂粉精、漂白粉、白僵菌、乙酸钡、氟化钙、水杨酸、松醇油、碳酸钡、醋酸钡、95福美钠、苯丙乳液、三乙二醇、鱼虾养殖、单乙醇胺、三乙醇胺、氯偏乳液、快干水泥
- 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、三甲代烯丙基异氰酸酯、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：漂白粉、茶皂素、噻霉酮、三烯丙基异氰酸酯价格、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：防冻液、冰醋酸、乙二醇、陶氏异氰酸酯、冰乙酸、纯吡啶、丙二醇、羟基苯、14丁二醇、3-丙三醇、四氢呋喃、环保乙腈、化工苯酚、1.4丁二醇、医用苯酚、工业苯酚、精制苯酚、价位四氢、乙腈工业、乙酸乙酯、吡啶化工、甲酸乙酯、吡啶工业、求购苯酚、高纯三氯、实验乙腈
- 主营：福美钠、漂白粉、次氯酸钠、强氯精、漂粉精、DOP、DBP、蛋白胨
- 主营：白炭黑、白僵菌、eva乳液、棕榈蜡、pvc发泡剂、聚碳酸酯、聚乙烯蜡、苯甲酸铵、t-31固化剂
- 主营：化工
- 主营：橡胶油、增塑剂、工业尿素、防冻液原液、分析试剂、生物肥料、水产养殖、硫代硫酸钠、大棚增温块、磷酸二氢钾、工业润滑剂、葡萄糖酸钠、食用葡萄糖、食品凝固剂、水溶性糊精、液体硅酸钠、生物颗粒燃料、食用玉米淀粉、聚氨酯黑白料、改良土壤团粒、混凝土外加剂、植物油酸、苯甲醇、甘油、车用尿素
- 主营：异丙醇、冰醋酸、正庚烷、化工原料、江苏化工原料、甲基环己烷、乙二醇、苯酚、江苏异丙醇、工业吡啶、工业苯酚、正丁醇、MIBK、无水乙醇、正己烷