4A Molecular Sieve Activated Powder
Sourc:The SiteAddtime:2026/4/17 Click:0
1. Introduction（引言）
Polyurethane (PU) materials are widely used in coatings, adhesives, sealants, and elastomers due to their excellent mechanical properties and versatility. However, trace moisture in raw materials can lead to unwanted side reactions, such as CO₂ bubble formation, shortened pot life, and reduced product stability.
4A molecular sieve activated powder, a synthetic zeolite with a pore size of 0.4 nm, offers a targeted solution by selectively adsorbing water molecules while excluding larger organic compounds. Its high surface area and thermal stability make it an ideal choice for moisture control in PU systems.
（聚氨酯（PU）材料因其优异的机械性能和多功能性，广泛应用于涂料、胶黏剂、密封胶和弹性体领域。然而，原料中的微量水分可能引发副反应，如CO₂气泡生成、适用期缩短及产品稳定性下降。4A分子筛活化粉是一种孔径为0.4纳米的合成沸石，通过选择性吸附水分子（排除较大有机化合物）提供针对性解决方案。其高比表面积和热稳定性使其成为PU体系水分控制的理想选择。）
2. Properties of 4A Molecular Sieve Activated Powder（4A分子筛活化粉的特性）
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Selective Adsorption: Pore size of 0.4 nm allows water molecules (0.28 nm) to enter while blocking larger molecules like ethanol (0.36 nm) and acetone (0.46 nm).
（选择性吸附：0.4纳米孔径允许水分子（0.28纳米）进入，同时阻挡乙醇（0.36纳米）、丙酮（0.46纳米）等较大分子。）
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High Adsorption Capacity: Can adsorb up to 22% of its weight in water at 25°C and 10% relative humidity.
（高吸附容量：在25℃、10%相对湿度下可吸附自身重量22%的水分。）
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Thermal Stability: Withstands temperatures up to 300°C without structural degradation, suitable for high-temperature processing.
（热稳定性：可耐受300℃高温而不发生结构降解，适用于高温加工场景。）
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Chemical Inertness: Does not react with PU components, ensuring no impact on product properties.
（化学惰性：不与PU组分反应，确保不影响产品性能。）
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Fine Particle Size: Typically 2–4 μm, enabling excellent dispersion in PU formulations.
（细粒径：通常为2–4微米，易于在PU配方中均匀分散。）
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