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Polyurethane Screen Panels: Comprehensive Comparison of MDI and TDI Characteristics and Applications
Analysis of MDI and TDI Characteristics and Applications in Polyurethane Screen Panels
Polyurethane screen panels are critical in industrial operations, with their performance heavily influenced by the choice of isocyanate raw materials—MDI (diphenylmethane diisocyanate) and TDI (toluene diisocyanate). These two compounds differ significantly in molecular structure and reaction characteristics, directly affecting the panels' wear resistance, flexibility, aging resistance, and application scenarios. This article provides a detailed comparison of MDI and TDI properties and explores their uses across various industrial fields.
1. Basic Characteristics of MDI vs. TDI
MDI Properties: High hardness, excellent wear resistance, and strong aging resistance. Adaptable to acid-base media and temperature variations (-30°C to 80°C), with a long service life.
TDI Properties: Superior elasticity and low-temperature flexibility (down to -40°C), ideal for flexible screening, but relatively weaker in wear and chemical resistance.
2. MDI-Based Polyurethane Screen Panels: The Mainstream Choice in Industry
Core Advantages
High hardness and wear resistance, with a service life 1.5~3 times that of TDI systems.
Excellent resistance to hydrolysis, high and low temperatures, and acids/bases, suitable for harsh conditions.
Application Scenarios
High-Wear and High-Impact Material Screening: Such as iron ore, coal, non-ferrous metal ores, and construction aggregates.
Harsh Operational Environments: Wet screening (e.g., ore slurry, mud), high or low temperatures, and chemical material screening.
High-Demand Industrial Fields: Cement, lime, coke, steel slag screening, requiring long life and low maintenance.
3. TDI-Based Polyurethane Screen Panels: Supplement for Niche Flexible Scenarios
Core Advantages
Outstanding elasticity and low-temperature flexibility, preventing crushing of brittle materials.
Lower raw material costs, suitable for short-term or low-budget applications.
Application Scenarios
Low-Wear and Low-Impact Material Screening: Such as grains, feed, fertilizer particles in agriculture.
Low-Temperature Environment Screening: Outdoor scenarios in northern winters, e.g., ice-snow mixtures.
Temporary or Low-Cost Needs: Light screening in agriculture, food processing, and other non-industrial applications.
4. How to Choose Between MDI and TDI Screen Panels Based on Needs
For High Wear and Long Life: Prefer MDI systems.
For Flexibility, Low Temperature, or Cost Efficiency: Consider TDI systems.
Evaluate material characteristics, environmental conditions, and budget comprehensively to achieve optimal screening results.
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Huatao Group
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