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PU AU (Polyurethane)

  • CBD.SEALS
  • PU AU (Polyurethane)
    • High strength, excellent tear and abrasion resistance as well as superior penetration resistance for PU (Polyurethane)
    What is the PU (Polyurethane) ?

    PU, known as Polyurethane, is a polymer produced by the reaction of Isocyanate and Polyol. Polyurethane is widely used in several industries due to its excellent physical and chemical properties such as abrasion resistance, elasticity, chemical resistance, weatherability and adjustable hardness. Below are detailed information about PU.

    Chemical structure and synthesis

    Monomers: The main monomers of PU include isocyanates (e.g. toluene diisocyanate TDI, diphenylmethane diisocyanate MDI) and polyols (e.g. polyether polyols, polyester polyols).

    Polymerization Reaction: PU is synthesized through an addition polymerization reaction (i.e., polyurethanation) between isocyanates and polyols. During the reaction, the isocyanate group (-NCO) of the isocyanate reacts with the hydroxyl group (-OH) of the polyol to form a urethane bond (-NH-COO-).

    Crosslinking: PU can be crosslinked by adding crosslinking agents (e.g., chain extenders) to form a crosslinked structure, thereby improving its mechanical properties and durability.

    Our CBD Seals PU (Polyurethane)  Compounds information：

    Adjustable hardness: The hardness of PU can be adjusted by adjusting the ratio of polyol and isocyanate as well as adding different additives to achieve a wide range from soft to hard.

    Abrasion resistance: PU has excellent abrasion resistance and is suitable for use in the manufacture of abrasion-resistant materials such as rollers and conveyor belts.

    Elasticity: PU has good elasticity and can be used to manufacture elastomers, such as foam, elastic fibers, etc.

    Chemical resistance: PU has good chemical resistance and can resist the erosion of some acids, alkalis and solvents.

    Weather resistance: PU has good UV and ozone resistance.

    Shock absorption: PU foam has good shock absorption properties and is suitable for use in the manufacture of cushioning materials and sound insulation materials.

    Processing and vulcanization

    Processing methods: PU can be processed by injection molding, extrusion, casting, spraying, calendering and other methods.

    Molding technology: The molding technology of PU includes reaction injection molding (RIM), casting molding, foam molding and so on.

    Areas of application

    Automotive industry: used in the manufacture of automotive interior parts, seats, bumpers, tire curtains, and so on.

    Construction industry: Used to manufacture thermal insulation materials, waterproof materials, resilient flooring, etc.

    Footwear manufacturing: used to manufacture soles and insoles for sports shoes and casual shoes.

    Furniture industry: used to manufacture filling materials for sofas, mattresses and other furniture.

    Sporting goods: used in the manufacture of sports grounds, running tracks, balls, etc.

    Electronics industry: used to manufacture seals and cushioning materials for electronic products, etc.

    Sustainability

    Recycling: PU can be recycled and reused to reduce the impact on the environment. Some advanced recycling technologies can convert waste PU into new PU products or other useful materials.

    PU excels in a wide range of industrial applications with its excellent abrasion resistance, good mechanical properties, oil and chemical resistance, as well as good low temperature and weather resistance.

    PU is superior to Fluorocarbon in terms of abrasion resistance, mechanical properties and oil resistance, but inferior to Fluorocarbon in terms of high temperature resistance and some chemical resistance.

    PU is superior to NBR in abrasion resistance, mechanical properties and oil resistance, but inferior to NBR in high temperature resistance, certain chemical resistance and cost.