How Shoe Sole Manufacturers Choose Different Petroleum Resins for Different Soles

Petroleum resins play a critical role in sole manufacturing by enhancing adhesion, improving material compatibility, and boosting physical-mechanical properties. Below is a detailed analysis of their applications and selection criteria:

1. Enhancing Adhesion Performance

PVC Soles: As a tackifier, Kaiying C9 hydrogenated petroleum resin (e.g., KY-C9R100 ) interacts with PVC surface molecules to form strong bonds, significantly improving interlayer adhesion and cohesion .

Multilayer Sole-Upper Bonding: Compatible with EVA and SBS, Kaiying resins increase bond strength and prevent delamination .

2. Optimizing Material Properties

Reinforcement & Flexibility: In rubber soles, C5 resins (e.g., KY-C5R110) improve tensile strength, elongation, and tear resistance while softening the material for better flexibility .

Weather Resistance: Hydrogenated C9 resins (e.g., Kaiying KY-C9H100  ) offer acid/alkali resistance and UV stability, ideal for outdoor footwear .

3. Streamlining Processing

Reduced Mixing Time: Resins like C5/C9 copolymers enhance rubber compound flow during vulcanization, lowering energy consumption .

Hot-Melt Adhesives: Kaiying hydrogenated resins (softening point 95–105°C) ensure thermal stability during sole pressing .

4. Special Requirements

Low Odor & Light Color: Hydrogenated resins suit medical or light-colored soles due to water-white clarity and minimal VOC .

Cost Efficiency: Petroleum resins are cheaper than natural tackifiers without sacrificing performance .

Manufacturers select resins based on material compatibility (PVC/rubber/EVA) and performance needs (adhesion, flexibility, or weather resistance). For example, C5 excels in rubber soles, while hydrogenated C9 suits high-end applications. Kaiying and other brands offer tailored solutions to meet these demands .