Nitrile recycled rubber powder is made from waste nitrile rubber or used nitrile rubber products as raw materials, processed through mechanical crushing or grinding. It is oil-resistant, heat-resistant, cold-resistant, resistant to chemical solvents, wear-resistant, non-slip, and highly flexible, making it suitable for PVC modification, significantly improving the performance and processing efficiency of PVC products. What effects can nitrile rubber powder have in PVC modification, and what is the appropriate amount to use? In which applications can PVC materials modified with nitrile rubber powder be used?
1. Significance of using nitrile recycled rubber powder to modify PVC
In actual production, PVC modified with nitrile recycled rubber powder has better impact resistance and flexibility, improving the tensile strength, wear resistance, and low-temperature performance of PVC materials, and enhancing PVC's oil resistance, corrosion resistance, aging resistance, and thermal stability. Nitrile rubber powder can act as a polymer plasticizer in PVC modification, improving processing flowability, reducing the migration and volatilization of plasticizers, and increasing dimensional stability of products. Compared with block nitrile rubber, nitrile rubber powder is cheaper and easier to mix uniformly with PVC.
2. Selection tips for nitrile recycled rubber powder for PVC modification
When selecting nitrile recycled rubber powder for PVC modification, factors such as acrylonitrile content and particle size need to be considered.
Generally, nitrile recycled rubber powder with high acrylonitrile content has good compatibility with PVC, improving the material's tensile strength and oil resistance; low-acrylonitrile content powder can impart better elasticity to PVC.
When blending PVC with nitrile rubber powder, smaller particle sizes disperse more evenly, effectively enhancing PVC's impact resistance and heat distortion temperature; larger particle sizes have better processing performance but relatively weaker modification effects. Nitrile rubber powder above 60 mesh significantly improves toughness, while recycled nitrile rubber powder above 80 mesh disperses more uniformly, increasing PVC's tensile strength and elongation at break.
3. Dosage of nitrile recycled rubber powder in PVC modification
Nitrile rubber powder is an ideal material for toughening and modifying PVC, and the dosage is not fixed. To improve PVC's impact resistance, it is recommended to add 15%-30%; to enhance processing flowability and surface smoothness and reduce brittleness caused by excessive calcium powder, a 3%-5% addition of nitrile recycled rubber powder is suggested. The amount of nitrile rubber powder in PVC formulations needs to balance impact resistance, processability, and other properties.
4. Specific applications of PVC modified with nitrile recycled rubber powder
Adding 3-5 parts of nitrile powder to PVC shoe soles improves elasticity and wear resistance, preventing cracking; for PVC cable sheaths, nitrile rubber powder modification enhances oil and wear resistance; adding 2%-3% nitrile recycled rubber powder to PVC sealing strips significantly improves toughness, wear resistance, and low-temperature performance, ensuring good sealing and long service life. PVC industrial pipes modified with nitrile rubber powder have enhanced pressure resistance and corrosion resistance.
PVC materials modified with nitrile recycled rubber powder are widely used in cable sheaths, footwear, sealing rings, door and window strips, hoses, car interior parts, and other areas. Further specific applications of PVC modified with nitrile rubber powder will be shared in the future.
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