Toluene Diisocyanate (TDI)

Toluene Diisocyanate (TDI) is one of the most important isocyanate monomers in the polyurethane industry chain. It is produced from toluene through a three-step process: nitration, hydrogenation, and phosgenation. Its molecular formula is C₉H₆N₂O₂. It appears as a colorless to pale yellow transparent liquid with a strong irritating odor and is classified as a hazardous chemical (UN 2078). The core chemical function of TDI lies in its highly reactive -NCO groups, which can rapidly react with hydroxyl groups in polyols, water molecules, amines, and other active hydrogen-containing compounds to form urethane or urea linkages, building the polyurethane polymer backbone. Depending on the ratio of 2,4- and 2,6-isomers, TDI is divided into three main commercial grades: T80/20, T100, and T65/35. These grades differ significantly in reaction rate, gel time, and foaming behavior, allowing precise matching with different downstream formulation systems. The company relies on authorization from major producers such as Gansu Yinguang Juyin Chemical (Baiyin), Cangzhou Dahua (Canghua), and Covestro. It has an annual supply capacity of over 10,000 tons, covering global markets for flexible foam, elastomers, coatings, and adhesives. It supports ISO tank container shipments and Central Asia railway transport. Full documentation including MSDS, TDS, and COA is provided to meet customs clearance and corporate qualification requirements in various countries.

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Methylene Diphenyl Diisocyanate (MDI)

Polymeric Diphenylmethane Diisocyanate (PMDI, also known as polymeric MDI) is the highest-functionality commercial product in the MDI series. It consists of 4,4'-diphenylmethane diisocyanate (4,4'-MDI) and polymethylene polyphenylene polyisocyanate homologues. Its average functionality is 2.7–3.0, with an NCO content of approximately 30%–31.5%. Compared with TDI, PMDI has extremely low vapor pressure (at 25°C approximately 0.001 mPa·s, only one ten-thousandth of that of TDI), which significantly reduces inhalation hazards and provides a safer working environment. Its highly crosslinked aromatic structure gives the material excellent thermal stability, mechanical strength, and dimensional stability, making it an essential raw material in rigid polyurethane (PUR) and polyisocyanurate (PIR) foam systems. Our company supplies genuine Covestro® PMDI 44V20L. This product has a viscosity of approximately 150–250 mPa·s (25°C), offering excellent flowability and outstanding compatibility with both polyether polyols and polyester polyols. It features stable quality and reliable processing performance, meeting demanding industrial application requirements. ApplicationsCovestro® PMDI 44V20L is widely used in the production of high-performance rigid polyurethane foams and insulation materials, including:Refrigerator and freezer insulation foamBuilding exterior PIR insulation boardsCold storage and refrigerated warehouse panelsPipeline insulation systemsWaterproof grouting and injection materialsRigid polyurethane insulation boardsIndustrial thermal insulation engineeringEnergy-efficient building insulation materials

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Polyether Polyol

Polyether Polyol is a class of high-molecular-weight polymers produced through the ring-opening polymerization of propylene oxide (PO) and/or ethylene oxide (EO), using low-molecular-weight polyols or amine compounds as initiators under the action of catalysts. Common initiators include ethylene glycol, propylene glycol, glycerol, and pentaerythritol, while commonly used catalyst systems include potassium hydroxide (KOH) and double metal cyanide (DMC) catalysts. The molecular chains of polyether polyols contain terminal active hydroxyl groups (-OH), providing excellent reactivity with isocyanates to form polyurethane materials. Depending on molecular structure design, polyether polyols typically have a functionality range of 2–8, molecular weights ranging from approximately 200 to 12,000, and hydroxyl values of approximately 20–600 mgKOH/g.As the core raw material of the B-side (polyol component) in polyurethane systems, the molecular weight, functionality, and EO/PO ratio of polyether polyols directly influence the final performance of polyurethane products. Among them:Molecular weight determines the flexibility, resilience, and elongation properties of polyurethane materials;Functionality affects crosslinking density, hardness, and dimensional stability;EO-capping structure influences hydrophilicity, reaction speed, and foaming performance.Through tailored molecular structure design, polyether polyols can meet the requirements of various polyurethane applications, including flexible foams, rigid foams, elastomers, adhesives, and sealants. Product ApplicationsWANOL series polyether polyols are widely used in:High-resilience flexible polyurethane foam (HR Foam)SofasMattressesAutomotive seatsRigid polyurethane insulation foamRefrigerator and freezer insulation layersBuilding insulation boardsCold storage insulation systemsSpray polyurethane insulation materialsPolyurethane adhesivesPolyurethane sealantsPolyurethane elastomersCASE materials (Coatings, Adhesives, Sealants, Elastomers)Pipeline insulation and industrial energy-saving materials

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Polymer Polyol / POP

Polymer Polyol (POP) is a high-performance modified polyether polyol product. It is based on a polyether polyol matrix, in which styrene-acrylonitrile (SAN) monomers undergo in-situ polymerization to form stable dispersed solid polymer particles within the polyether system. POP products typically contain 20%–45% solid content, with the solid polymer particles uniformly dispersed in the continuous polyether polyol phase. Through the introduction of rigid SAN polymer particles, POP can significantly enhance the load-bearing capacity, hardness, compression strength, and dimensional stability of polyurethane foams without substantially increasing the molecular weight of the polyether polyol.Compared with conventional polyether polyols, POP provides significant improvements in the mechanical properties of flexible polyurethane foams and serves as an essential functional raw material for the production of high-load-bearing and high-resilience polyurethane foam systems. Key FeaturesEnhances foam load-bearing capacity and support performance;Improves hardness and compression strength;Optimizes foam cell structure and dimensional stability;Increases product durability and service life;Suitable for high-performance flexible foam formulations. Product ApplicationsPolymer Polyol (POP) is mainly used in:High load-bearing flexible polyurethane foamPremium sofasMattressesAutomotive seatsHigh-resilience foam (HR Foam)Automotive interior components and vibration-damping materialsHigh-density flexible foam productsIndustrial cushioning materialsSpecialty polyurethane foam systems

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