UV Stabilization Process for Construction Waste Chutes

UV stabilization is a key process for ensuring the outdoor service life of HDPE. Through scientific formulation and production processes, Longkang ensures products last over 5 years outdoors. This article explains the UV stabilization process in detail.

1. Principle of UV Stabilization

HDPE degrades under UV exposure:

1. UV excites molecular chains
2. Generates free radicals
3. Molecular chain scission
4. The material becomes brittle and chalks

The stabilization process suppresses degradation by adding stabilizers.

1. Longkang Stabilization Formulation
2. Carbon Black (Primary Stabilizer)

• Addition amount: 2%–3%
• Carbon black particle size: 20–40 nm
• Function:
• Absorbs UV
• Blocks light penetration
• Traps free radicals
• Physical shielding + chemical stabilization

2. Antioxidant

• Addition amount: 0.1%–0.3%
• Type: hindered phenolic
• Function: suppresses thermal-oxidative aging
• Synergistic with carbon black

3. UV Absorber (Optional)

• Addition amount: 0.2%–0.5%
• Type: benzotriazole
• Function: absorbs UV energy
• Enhances weather resistance

III. Mixing Process

1. Precise weighing according to formulation
2. Mixed in a high-speed mixer
3. Temperature 60–80 ℃
4. Mixing 5–10 minutes
5. Ensures uniform dispersion
6. Carbon black does not agglomerate
7. Weather Resistance Verification
8. Natural Exposure

• Hainan exposure test for 5 years
• Tensile strength retention ≥80%
• Elongation retention ≥50%

2. Artificial Accelerated Testing

• UV aging for 1000 hours
• Performance change ≤±20%

3. Engineering Verification

• Actual use on multiple projects for over 5 years
• No obvious aging or cracking

1. Color and Weather Resistance

• Black (containing carbon black) has the best weather resistance
• White and colored products have poor weather resistance
• Longkang standard products are black
• Other colors require special formulations

1. Longkang Weather Resistance Commitment
2. Sufficient carbon black added
3. 5-year outdoor weather resistance warranty
4. Enhanced formulation optional for southern regions with strong UV
5. No corner cutting
6. Products are black; carbon black content is visible to the naked eye