How to Apply Expandable Microsphere in microcellular PU foam
To apply expandable microspheres in microcellular PU foam, follow these steps:
1. Preparation:
Waytop microspheres, such as Waytop DU, can be pre-mixed with the polyol or mixed with a plasticizer and used as a liquid masterbatch added directly to the mixing head. It is recommended to add the microspheres separately as a liquid masterbatch to avoid premature expansion in the polyol.
2. Temperature Control:
Ensure the temperature of the mold and polyol is optimized for the desired foam structure and skin formation.
3. Curing Speed:
Adjust the curing speed of the system by selecting an appropriate catalyst. A slow catalyst allows the microspheres time to expand before the curing of the PU system starts.
Benefits of using expandable microspheres in microcellular PU foam include:
– Density Reduction of microcellular PU foam:
By incorporating expandable microspheres like Waytop DU, you can achieve a significant reduction in foam density, leading to lighter end products.
– Improved Foam Structure:
The addition of microspheres enhances the foam structure, resulting in a more uniform and consistent cellular morphology.
– Mechanical Properties of microcellular PU foam:
Despite the density reduction, the mechanical properties of the foam can be maintained or even improved, providing a balance between weight reduction and performance.
– Skin Formation and Abrasion Resistance:
The use of microspheres can promote skin formation with improved abrasion properties, enhancing the durability of the foam product.
By carefully applying expandable microspheres in microcellular PU foam, you can achieve a lightweight, structurally sound foam with enhanced properties suitable for various applications.
For more applications, please check our application sections:
https://www.expandablemicrosphere.com/applications
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