Activated molecular sieve powder is a white powder, which is formed by dehydrating synthetic molecular sieve powder.
Due to the high-temperature roasting, raw powder lose moisture and has a strong adsorption capacity. It can be directly used in formulation without affecting performance.

It's widely used in polyurethane, adhesives, coatings, sealant and other industries.

Technical Data:

Activated powder can serve as a defoaming agent in many polyurethane formulations, such as polyurethane floor adhesives, polyurethane electronic adhesives, polyurethane elastomers, and PU inks. This is because the isocyanate in polyurethane has high reactivity and can react with moisture in the air to produce carbon dioxide, leading to bubble formation. Activated powder features uniform pore sizes and, after high-temperature activation, removes moisture, exhibiting strong adsorption capabilities. It can adsorb moisture in the polyurethane system while also providing a certain catalytic effect. A more detailed introduction is as follows:

1. Efficient Moisture Adsorption

   • Dehydration Effect: Molecular sieve activated powder has strong hygroscopic properties, effectively adsorbing moisture in polyurethane raw materials. This prevents moisture from reacting with isocyanate to generate carbon dioxide, thereby avoiding bubble formation.

   • Enhanced Stability: By removing moisture, molecular sieve activated powder improves the storage stability and performance of adhesives.

2. Improved Adhesive Performance

   • Enhanced Bonding Strength: After adsorbing moisture, molecular sieve activated powder reduces side reactions, improving the bonding strength of adhesives.

   • Extended Pot Life: By controlling the reaction rate, molecular sieve activated powder extends the pot life of adhesives, making them easier to handle.

3. Catalytic Effect

   • Reaction Acceleration: Molecular sieve activated powder possesses certain catalytic capabilities, accelerating the reaction between isocyanate and polyol, thereby shortening curing time.

   • Increased Cross-Linking Density: The catalytic effect helps increase the cross-linking density of adhesives, enhancing their mechanical properties and chemical resistance.

4. Reduction of Bubbles and Defects

   • Bubble Prevention: By adsorbing moisture and volatile substances, molecular sieve activated powder reduces the formation of bubbles and defects, improving the appearance and performance of adhesives.

   • Improved Uniformity: The addition of molecular sieve activated powder makes adhesives more uniform, reducing issues of localized rapid reactions.

5. Environmental and Safety Benefits

   • Non-Toxic and Harmless: Molecular sieve activated powder is non-toxic, odorless, and safe to use, meeting environmental requirements.

   • Reusability: It can be reused after regeneration treatment, reducing costs.

Summary
The application of molecular sieve activated powder in polyurethane adhesives primarily benefits from its efficient moisture adsorption and catalytic effects. It significantly enhances the performance and stability of adhesives while reducing bubbles and defects, making it an ideal additive.