This article explores the differences between polyester polyurethane and polyether polyurethane, focusing on their reaction principles, resulting properties, and development trends, highlighting the distinct advantages and limitations of each type in various applications.
Isocyanates, crucial in polyurethane production, include TDI variants (2,4-TDI, 2,6-TDI). TDI-100 suits castable polyurethane, T-80 is widely used, and T-65 is for high-rebound foams. Reactivity varies due to molecular structures. TDI is a transparent liquid with a coloration tendency, distinctive odor, and solidification point influenced by composition.
Polyurethane, a versatile polymer, is acclaimed for its transformative impact across diverse sectors. Evaluation of polyurethane adhesives encompasses sensory and quantitative testing methods, ensuring comprehensive assessments of bonding effectiveness on various substrates. Choosing appropriate evaluation criteria aligns with specific bonding applications, fostering the material’s wide-ranging applications.
Memory foam, with temperature sensitivity and shock absorption, provides ergonomic design, antimicrobial properties, and pressure relief. It offers comfort by adapting to body temperature and reducing pressure on different body parts.
In the foam industry, PU flexible foams are grouped by density (KG/M3): high-density for sound absorption, sofa cushions, and soft packaging; medium-density for protection. High-density foam (≥45) with abundant pores is versatile, while medium-density foam (45-18) is widely used for protective purposes.
The difference between high-density foam and high-resilience foam lies in density and structure. High-density foam, suitable for sound-absorbing cotton and soft packaging, has high density and greater mass. On the other hand, high-resilience foam, made with polyether polyols, boasts excellent resilience and breathability, primarily used in car seats and furniture. The two types differ significantly in principles, applications, and characteristics.
Factors affecting the resilience of polyurethane foam include: 1. Cell opening rate; 2. Cell shape; 3. Cell pore size and distribution; 4. Polyether polyol; 5. Isocyanate; 6. Other factors.
This article introduces the production process and principles of polyurethane foam, including main raw materials, synthesis principles, and the production process. It covers the characteristics of flexibility, elasticity, and water absorption in polyurethane foam, widely used in furniture and decorative industries.
Polyurethane (PU), a type of polymer, possesses a thermoplastic linear structure with good stability, chemical resistance, and resilience.
The molding of polyurethane foam involves two stages: the foaming process and the curing process. The process from the mixing of raw materials to the cessation of foam volume expansion is known as the foaming process
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