What are the Applications of PVC Chemical Additives?

PVC foam products are lightweight polymer materials with honeycomb microscopic pore structures formed by physical or chemical foaming processes with polyvinyl chloride resin as the main material. Their performance optimization is highly dependent on the synergistic effect of PVC chemical additives. They are widely used in architectural decoration, industrial packaging, and vehicle interior decoration.

In terms of melt rheological properties regulation, PVC chemical additives enhances the viscoelastic relaxation time so that the gas nuclei generated by the decomposition of carbon dioxide or azo foaming agents are evenly bound in the viscoelastic medium. The stability of this closed-cell structure is directly related to the density gradient of the product.

For the application extension of polyolefin systems, PVC chemical additives achieves melt stretching and hardening effects by regulating entanglement sites. The melt strength of polypropylene has been improved, and the critical stretch ratio of the film bubble in blow molding can be increased by 2.3 times, which plays a decisive role in the densification of the pores of microporous foam products. In terms of plasticization uniformity, PVC chemical additives reduces the standard deviation of the melt temperature field by reducing the local shear heat generation difference, effectively eliminating the surface shark skin phenomenon and internal layered defects caused by insufficient plasticization.

Applications in other fields. The Mooney viscosity of the rubber blend system can be reduced by 12-18 points through PVC chemical additives. The plasticizing effect is achieved by cutting off the physical crosslinking points between the rubber molecular chains, while retaining the chemical crosslinking active sites to ensure the performance after vulcanization. In the field of coatings, the ability to control the surface tension gradient shortens the leveling time of the coating and inhibits the formation of Bénard vortices through the Marangoni effect, ultimately improving the gloss. The defoaming mechanism in the ink system is related to the control of the liquid film drainage rate, and the bubble life is shortened by increasing the surface viscoelastic modulus.