In PVC sheet manufacturing, both polyethylene wax (PE wax) and oxidized polyethylene wax (OPE wax) serve as crucial processing aids, playing key roles in improving processing performance and product quality, though their specific functions and application scenarios differ.

I. Primary Functions of Polyethylene Wax (PE Wax)

1. Lubrication Effects:

• Acts as a typical internal lubricant to effectively reduce friction between PVC molecular chains

• Significantly lowers melt viscosity and improves melt fluidity

• Reduces energy consumption and equipment wear during processing

2. Processing Performance Enhancement:

• Shortens plasticization time and increases production efficiency

• Balances melt fluidity and melt strength

• Reduces exudation during processing

3. Impact on Product Properties:

• Improves product surface smoothness

• Has minimal effect on haze in transparent products

• Typical dosage ranges from 0.1-1.0 phr

II. Unique Functions of Oxidized Polyethylene Wax (OPE Wax)

1. Dual Lubrication Characteristics:

• Provides both internal and external lubrication functions

• Polar groups enhance compatibility with PVC

• Non-polar components offer good mold release properties

2. Multifunctional Performance:

• Significantly improves filler dispersion (e.g., CaCO3)

• Enhances surface printability of products

• Improves adhesion in subsequent coating processes

3. Process Optimization:

• Broadens processing temperature window

• Reduces melt fracture phenomena

• Typical dosage ranges from 0.3-1.5 phr

III. Application Comparison and Selection Guidelines

Selection Recommendations:

1. For standard PVC sheets, prioritize PE wax for cost efficiency

2. For highly filled systems, recommend OPE wax to improve processing and dispersion

3. For products requiring subsequent printing/coating, OPE wax is preferred

4. Blending both can achieve optimal cost-performance ratio

IV. Usage Considerations

1. Strictly control dosage as excess may cause over-lubrication

2. Consider synergistic effects with other additives

3. Adjust dosage based on equipment type

4. Different molecular weight waxes suit different processing techniques

In actual production, these wax additives should be reasonably selected and combined according to specific formulation requirements, processing techniques, and product applications to achieve optimal processing performance and product quality.