PVC Tarpaulin Anti-Mildew & Antibacterial Functions and Application Scenarios  

I. Anti-Mildew and Antibacterial Technical Principles  
1. Core Anti-Mildew Agent Types and Mechanisms  
- Organic-Inorganic Composite Anti-Mildew Agents  
  - Organic Components (e.g., quaternary ammonium salts, phenolic derivatives): Rapid sterilization (effective within hours), immediate bacterial inhibition.  
  - Inorganic Components (e.g., nano-silver, zinc oxide carriers): Long-lasting mildew resistance (withstands >350°C), disrupt microbial cell structures via metal ions.  
  - Composite Advantage: Solves issues of fast dissolution and poor weather resistance in single-component agents; antibacterial rate >99%; mildew resistance grade 0-1 (highest standard).  

- Low-Odor Eco-Friendly Formulation  
  - Tributyl citrate replaces traditional phthalate plasticizers, reducing VOC emissions.  
  - Hindered phenol antioxidants minimize processing odors.  

2. Material Structure and Process Optimization  
- Multilayer Design:  
  - Base Fabric Layer: High-strength polyester (warp strength ≥2100N/5cm).  
  - PVC Functional Layer: Anti-mildew agents (0.5-1.5 phr), halogen-free flame retardants (5-9 phr).  
  - Surface Treatment Layer: Secondary coating with anti-mildew agents (2.5-4 phr) for enhanced antibacterial properties.  
- Key Processes:  
  - Staged Plasticization: PVC coating at 180-220°C; surface layer dried at 50-75°C to prevent agent decomposition.  
  - Curing: 5-7 days at room temperature to enhance cross-linking density.  

II. Application Scenarios & Requirements  
| Scenario           | Core Needs               | Anti-Mildew Solution                          | Additional Requirements       |  
| Medical Tents      | High antibacterial, low odor | Dual-layer agents (4 phr total)                  | Fold resistance, ventilation compatibility |  
| Logistics Tarps    | Weather/mildew/rain proof    | Composite agents (0.3%-0.5%) + anti-slip surface | Tear resistance (≥1600N/5cm)     |  
| Grain Storage Covers| Mildew inhibition, cold resistance | Cold-resistant plasticizers + 1.5 phr agents     | UV resistance, -20°C tolerance   |  
| Welding Blankets   | Flame retardant, anti-corrosion | Synergistic anti-mildew/flame retardant additives | Fire certification (≥1h resistance) |  
| Outdoor Shelters   | Long-term mildew resistance  | Outdoor-specific agents (1.0%-1.5%)              | Acid/alkali resistance, aging resistance |  

III. Key Performance Metrics  
1. Efficacy:  
   - Antibacterial rate >99% against E. coli and S. aureus.  
   - Mildew resistance grade 0 (no growth) against mixed molds (e.g., Aspergillus niger).  
2. Environmental Adaptability:  
   - UV stability: 3-5 years outdoor service life.  
   - Temperature range: -20°C to 180°C (short-term).  
3. Safety:  
   - Heavy-metal-free (RoHS compliant), non-carcinogenic (LD?? >5000mg/kg).  

IV. Industry Trends  
- Smart-Response Materials: Thermosensitive anti-mildew agents (e.g., low-temperature release).  
- Renewable Additives: Epoxidized soybean oil replaces plasticizers.  
- Digital Monitoring: Embedded sensors for real-time microbial status (R&D phase).  

Summary: Prioritize ≥1.0% anti-mildew agents for humid environments. Medical use requires ISO 10993 biocompatibility tests. Standard logistics tarps suffice with 0.3% agents for cost efficiency.