Detailed explanation of the function, dosage, and principle of PVC foaming regulator

一、The role of PVC foaming regulator
In the production process of PVC foam products, PVC foam regulator plays a crucial role. Its main functions are reflected in the following aspects:
1. Improve melt strength: PVC foam modifiers can significantly enhance the strength of PVC melt, making it more effective in encapsulating gases and preventing gas escape and cell collapse. This function is crucial for maintaining the stability of the cell shape during the foaming process, which helps to obtain a more uniform foaming structure.
2. Optimize the cell structure: By adjusting the viscoelasticity of PVC melt and foaming regulator, ensure that the cells maintain a stable shape during the growth process, avoiding rupture due to adjacent cell compression or insufficient melt strength. The optimized cell structure makes the internal stress distribution of the foam board more uniform when subjected to external factors, thereby improving dimensional stability.
3. Promote plasticization process: Foam regulators can promote the plasticization of PVC resin, making PVC plasticization more uniform, thereby improving the surface glossiness and product quality of the product.
二、 The dosage and influencing factors of PVC foaming regulator
The dosage of PVC foaming regulator varies depending on the products of different manufacturers, the equipment used, the process conditions, and specific product requirements. Generally speaking, its dosage is between 1% and 5%. This range is based on actual production experience and a large amount of experimental data, and can be used as a reference.
However, it is worth noting that the amount of foaming regulator used is not necessarily better. Excessive foaming regulator may lead to excessive foaming, resulting in uncontrolled number and size of pores, thereby affecting product quality. On the contrary, insufficient dosage may lead to insufficient foaming, an increase in the number of defects, and also reduce product quality.
Therefore, when determining the dosage of PVC foaming regulator, multiple factors such as product goals, equipment capabilities, and process conditions should be comprehensively considered to find the optimal balance point.
三、 Working principle of PVC foaming regulator
PVC foaming regulator is essentially an acrylic processing aid, with a molecular weight much higher than that of general processing aids. During the processing, the long molecular chains of the foaming regulator will wrap and adhere to the molecular chains of PVC, forming a certain network structure. This structure not only enhances the melt strength of PVC, but also improves the physical properties such as elasticity and elongation of the melt, thereby facilitating the encapsulation of bubbles and preventing their coalescence or rupture.
In addition, foaming regulators can also regulate the fluidity of PVC molecular chains, reduce the friction between molecular chains, and enable PVC resin to flow better during processing. This helps to obtain foam products with good appearance.
In summary, PVC foam regulators play an irreplaceable role in the production of PVC foam products through their unique working principle. It can not only improve the quality and performance of products, but also optimize production processes and increase production efficiency. Therefore, it is crucial to choose the appropriate foaming agent in the production process of PVC foam products.