𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 : 𝐏𝐨𝐥𝐲𝐞𝐭𝐡𝐞𝐫 𝐏𝐔 𝐯𝐬 𝐏𝐨𝐥𝐲𝐞𝐬𝐭𝐞𝐫 𝐏𝐔 𝐑𝐞𝐬𝐢𝐧
𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 🔬 𝐏𝐨𝐥𝐲𝐞𝐭𝐡𝐞𝐫 𝐏𝐔 𝐯𝐬 𝐏𝐨𝐥𝐲𝐞𝐬𝐭𝐞𝐫 𝐏𝐔 𝐑𝐞𝐬𝐢𝐧: 𝐖𝐡𝐢𝐜𝐡 𝐎𝐧𝐞 𝐒𝐡𝐨𝐮𝐥𝐝 𝐘𝐨𝐮 𝐂𝐡𝐨𝐨𝐬𝐞? There's no universal winner.The key difference is the soft-segment chemistry, which influences how the PU resin behaves under different conditions. Polyether PU: 💧 Typically better hydrolysis resistance 💧 Better suited to water and humidity exposure Polyester PU: 🛢️ Typically stronger cohesive properties 🛢️ Better abrasion and oil resistance 🛢️ Suitable for applications requiring higher mechanical durability But choosing a PU resin isn't as simple as comparing two labels.The final performance also depends on molecular weight, hard-segment ratio, isocyanate structure, chain extender and crosslinking. 🎯 That's why the better approach is: Application environment → Performance target → Failure risk → Resin structure. 💡 In polyurethane formulation, the best resin isn't necessarily the one with the highe...