In the manufacturing process of PVC foamed products, foaming modifiers play a vital role. These specialized additives significantly improve the foaming process and enhance the overall performance of the final product through their unique mechanisms.

The core function of foaming modifiers is to optimize the cellular structure. By reducing the surface tension of the melt, they promote uniform bubble nucleation while effectively controlling the gas diffusion rate to prevent bubble coalescence. Research shows that high-quality foaming modifiers can precisely control the cell diameter within the range of 50-200 μm and achieve a closed-cell rate of over 90%, ensuring excellent thermal insulation and cushioning properties of the product.

In terms of processing, foaming modifiers significantly enhance melt strength, effectively preventing cell collapse and rupture. This not only increases the foaming ratio to 3-5 times but also reduces the product density to an ideal range of 0.6-0.9 g/cm³. More importantly, they eliminate surface defects and significantly improve the appearance of the product.

The improvement in product performance is particularly notable: impact strength increases by 30-50%, rigidity retention improves by 20%, and surface smoothness enhances by over 40%. These advancements greatly expand the application of PVC foamed products in areas such as building insulation and packaging materials.

Modern foaming modifiers also focus on environmental performance, with most products complying with international environmental standards. The recommended dosage is 3-8 phr, and they should be used in combination with foaming agents and lubricants. The optimal processing temperature range is 160-190°C.

In summary, foaming modifiers provide reliable performance guarantees for PVC foamed products by precisely controlling the foaming process and cellular structure. They have become an indispensable core additive in modern PVC foaming technology.

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