PVC material has poor impact resistance, heat deformation resistance and thermal stability, which makes it difficult to use as a structural material and has poor processing performance. Appropriate use of tire rubber powder in PVC can significantly improve the mechanical properties and processing technology of materials, especially impact resistance, and then expand the application range of PVC in rigid structural materials, such as plates. In actual production, the fineness and dosage of tire rubber powder directly affect the mechanical properties of PVC modified materials, and enterprises need to choose carefully.
1. The effect of tire rubber powder fineness on the mechanical properties of PVC materials
When using tire rubber powder to toughen PVC, the higher the fineness of the tire rubber powder as the dispersed phase, the better the impact resistance of the PVC/tire rubber powder composite. Generally using fine tire rubber powder with 80 mesh or more, the impact2LLYY99 resistance of the composite material can be increased by more than twice, and other mechanical indicators such as tensile strength will not change much. The manufacturer can select the tire rubber powder with the appropriate particle size according to the performance requirements of the PVC material and the cost budget.
2. The effect of tire rubber powder dosage on the mechanical properties of PVC materials
In actual production, the impact strength of PVC materials first showed a rapid increase with the increase in the amount of tire rubber powder. Generally, the amount of tire rubber powder increased to about 10%, and the impact performance reached the best state; after continuing to increase the amount of rubber powder , The impact strength rises slowly, and the tensile strength of the material drops significantly. Therefore, when using tire rubber powder to toughen PVC materials, the amount of tire rubber powder can be controlled at about 10%, which can effectively avoid the problem of significant decrease in the tensile strength and Young's modulus of the material.
Tire rubber powder is added to PVC material for toughening modification. In a microscopic state, PVC presents a continuous phase and rubber powder presents a dispersed phase; as the dispersed phase, tire rubber powder reaches submicron or micron level to achieve good modification effects. However, tire rubber powder, as a tough and highly crosslinked elastomer, has a fineness that does not reach this range at all. The tire rubber powder can be further dispersed into micron-sized particles in the PVC matrix. The higher the fineness of the rubber powder used, the better the dispersion performance in the PVC material.
The originally aggregated rubber powder blended in the PVC material will be evenly dispersed during the mixing process and no longer agglomerate. The particle size of the rubber powder will be further refined during the processing process, and the dispersion in PVC is better. The effect of toughness modification is better. In actual production, PVC material chooses to add about 10% tire rubber powder with 80 mesh or more. The impact strength of PVC/rubber powder composite material is obviously improved, and other mechanical indicators such as tensile strength and Young's modulus can basically meet the needs of products.
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