Modified asphalt waterproof membranes require high standards for low-temperature flexibility, heat resistance, aging resistance, and adhesion performance. Using recycled rubber powder to modify asphalt can improve the overall performance of the membrane while reducing raw material costs. Factors such as the type, fineness, dosage, and dispersion state of vulcanized rubber powder all affect the processing performance of modified asphalt and the quality of the finished waterproof membrane. What type of vulcanized rubber powder is commonly used for modified asphalt waterproof membranes? How to design the formula for modified asphalt waterproof membrane with recycled rubber powder, and how to produce it?
1. Tips for choosing reclaimed rubber powder for modified asphalt waterproof membranes
The main raw materials for asphalt waterproof membrane modified with recycled rubber powder include base asphalt, recycled rubber powder, aromatic oil, and fillers. When using rubber powder modified E6LYY731 for asphalt waterproof membranes, it is recommended to choose tire tread powder of 40-80 mesh, balancing dispersion uniformity and elasticity. When modifying asphalt waterproof membranes with tire rubber powder, special attention should be paid to powder fineness, rubber content, and uniform dispersion. Fine rubber powder particles help increase contact area with asphalt and improve mixing uniformity.
It should be noted that when choosing rubber powder for asphalt waterproof membrane modification, higher powder fineness is not always better.
2. Key points for formula design of recycled rubber powder modified asphalt waterproof membranes
In the production of modified asphalt waterproof membrane with recycled rubber powder, 40-mesh tire powder can be directly used to improve aging resistance and durability; 80-mesh tire powder can significantly improve the low-temperature toughness and elasticity of asphalt waterproof membranes, making it suitable for membranes with high elasticity requirements. Asphalt has low ductility at 15°C and has relatively low aromatic content, so a certain amount of aromatic oil can be added; Aromatic oil can also serve as a solubilizer for the rubber powder; Appropriate addition of fillers can improve the heat resistance of recycled rubber powder-modified asphalt waterproof membranes and further reduce production costs.
3. Key Points of the Production Process for Modified Asphalt Waterproof Membrane with Reclaimed Rubber Powder
The quality of rubber powder-modified asphalt waterproof membranes is nearby related to the feeding sequence, mixing temperature, and mixing time. After mixing base asphalt with aromatic oil, heat and stir to fully disperse the oil; Then add reclaimed rubber powder in batches and stir continuously at an appropriate temperature for several hours to fully wet, swell, and evenly disperse the rubber powder; Finally, add filler and continue stirring until the system is uniform, then discharge. Mixing temperature is not always better the higher.
In the production of modified asphalt waterproof membranes with recycled rubber powder, if the mixing temperature is too low, it can affect the dispersion and swelling of the rubber powder, while excessively high temperatures and prolonged time may accelerate asphalt aging. The mixing process should be adjusted according to the fineness and composition of the rubber powder to avoid local agglomeration and affect membrane quality.
When modifying asphalt waterproof membranes with recycled rubber powder, it is necessary to test softening point, low-temperature flexibility, heat resistance, elastic recovery, soluble content, and adhesion to the substrate;Chose rubber powder with higher rubber content, uniform particle size, and stable quality, combined with reasonable aromatic oil usage and mixing processes, to ensure the overall performance of modified asphalt waterproof membranes while controlling production costs.
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