Hard PVC can be made into special shaped materials through injection molding, which can be used for electrical enclosures, pipe fittings, etc. For injection molding, the biggest challenge is the special cavity structure of the grinding tool. The processing difficulty caused by the narrow channel conflicts with the cost, appearance, and performance of raw materials, and PVC is no exception.

The role of ACR processing aids in PVC is to promote the melting of PVC resin; Change the rheological properties of PVC melt; Improve the lubricity of PVC.

ACR processing aids increase the uniformity of melt plasticization, which can reduce molding defects in injection molding, improve yield, and increase product consistency. The benefits of ACR processing aids promote PVC fusion, plasticizing in a shorter time, resulting in a finer and more glossy surface of the product. Due to the improvement of plasticizing uniformity, the appearance and quality of the product are more uniform.

The melt viscoelasticity of PVC is generated by the entanglement of PVC molecules during processing. ACR processing aids can change the viscosity and elasticity of PVC melt. When the molecular weight of ACR is close to that of PVC resin, it has little effect on improving the rheological properties of the melt, except for promoting the melting of PVC resin; However, when the molecular weight of ACR is much higher than that of PVC, it can significantly increase the melt viscosity and elasticity of PVC.

The functions of ACR have corresponding benefits for the compounds in PVC injection molds. Melt promoting processing aids can provide faster, more continuous, and more uniform melting. Rheological modified processing aids can increase melt elasticity, thereby reducing jet and gate whitening. Lubricating processing aids help reduce metal adhesion and extend the working time between equipment cleaning before and after. It is also very important to choose a suitable processing aid for the application of PVC compounds and determine the appropriate dosage.

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