Analysis of External Factors Affecting the UV Aging Resistance of PP/PE Products

The effectiveness of a plastic's Anti-ultraviolet aging is influenced by multiple factors, which are primarily analyzed across five dimensions: Worker (Personnel), Machine (Equipment), Material, Method (Process), and Environment.

I. Personnel Factors (Worker)

1. Usage and Maintenance Management

Proper usage and regular maintenance (such as cleaning and avoiding mechanical damage) can delay aging and color change. Conversely, improper use will accelerate material degradation.

2. Standardized Operation

The diligence of worker during the production process, including the accuracy of additive formulation and the control of processing parameters, directly affects the effectiveness of the anti-aging agent.

II. Equipment Factors (Machine)

1. Processing Equipment Precision

Insufficient dispersion from mixing equipment can lead to the uneven distribution of the UV Stabilizer, thus reducing its protective effect. Furthermore, deviations in temperature control equipment may trigger thermal degradation of the material.

2. Aging Test Equipment

The wavelength range (which must cover both UVA and UVB) and the precision of the temperature and humidity control in the UV weathering chamber(accelerated aging tester) directly impact the accuracy of the aging assessment.

III. Material Factors (Material) 

1. Characteristics of the Plastic Substrate

Weather Resistance Differences: Polymers like Polycarbonate (PC) and Polytetrafluoroethylene (PTFE) have a relatively stronger inherent resistance to UV light, while polymers such as PVC and PS degrade more easily.

Molecular Structure: Polymers containing double bonds (such as PE) are generally more susceptible to attack by UV radiation.

2. Selection of Additives

The type and dosage of additives are crucial, including:

UV Stabilizers, Light Screening Agents, Antioxidants

IV. Method Factors (Process)

1. Formulation Design

This includes the ratio of resin to fillers and the concentration of the Light Stabilizer. For instance, the addition of carbon black can significantly improve light reflection and screening capabilities.

2. Processing Parameters

Temperatures that are too high or processing times that are too long can lead to the decomposition of additives, reducing their UV Protection Efficacy . Additionally, surface treatment processes (such as applying a UV-protective coating) can enhance overall protection.

V. Environmental Factors (Environment)

1. UV Light Intensity and Wavelength

UV-B directly damages the polymer's molecular chains.

UV-A accelerates the photo-oxidation reaction.

2. Synergistic Effect of Temperature and Humidity

High temperatures accelerate the rate of photodegradation.Changes in humidity cause expansion and contraction stresses in the material, which exacerbates the risk of cracking.