1、 Tearing principle

The rubber tearing process is divided into three stages:

Initial stage: Stress concentration forms microcracks.

Expansion stage: The crack gradually extends.

Fracture stage: The material ultimately fails.

2、 Enhancement plan

Material selection

Natural rubber: preferably SMR20 or above grade.

Synthetic rubber: SBR selects 23-25% styrene content.

Filler: Carbon black N234/N299 has the best performance.

Process optimization

Mixing temperature: controlled at 110-140 ℃.

Sulfurization system: 2.5 parts sulfur+1.2 parts accelerator.

Radiation treatment: 50-100kGy electron beam irradiation.

Formula design

Carbon black dosage: 40-50 phr.

Reinforced fiber: aramid fiber 3-5 phr

Nanomaterials: Carbon nanotubes 1-3 phr

3、 Application Cases

Tire tread formula:

NR/BR 70/30 + N234 50phr

Oil tube formula:

HNBR 100 parts+N550 40phr

Conveyor belt formula:

SBR/NR 50/50 + N220 45phr

4、 Implementation suggestions

1. Establish a raw material database.

2. Strict process control.

3. Regular performance testing.