Preparation method of storage-stable compound modified asphalt

Abstract

The invention relates to a preparation method of storage-stable compound modified asphalt. The preparation method of the storage-stable compound modified asphalt is characterized by comprising the following steps of: 1, adding 5-50% by weight of SBS (Styrene Butadiene Styrene) powder and 50-95% by weight of rubber powder into an extruder and carrying out water cooling, granulating and drying or roll cooling of a roller and slice forming on the reaction product to obtain a solid-state SBS / rubber powder blend; and 2, adding 0-5% by weight of an SBS thermoplastic elastomer into 72.5-90.5% by weight of matrix asphalt, shearing by utilizing a dispersion machine at the temperature of 130-170 DEG C, adding 1-20% by weight of SBS / rubber powder blend, 3-5% by weight of a compatilizer and 0.5-1.5% by weight of a stabilizer, stirring and mixing for 3-5 hours at the temperature of 175-185 DEG C, thereby obtaining the storage-stable compound modified asphalt. The compound modified asphalt prepared by adopting the method has the advantages of good stability and dispersity, difficult sedimentation, better high temperature and low temperature performances and good storage stability.

Description

technical field

[0001] The invention relates to a preparation method of road asphalt, in particular to a preparation method of a storage-stable composite modified asphalt. Background technique

[0002] With the increase of road traffic volume, load capacity and vehicle speed, the requirements for asphalt pavement are more stringent. Not only will there be no rutting and pushing under high temperature, but also no cracking and loosening under low temperature and rain erosion. Practice has proved that polymer modified asphalt can significantly reduce temperature sensitivity, improve the road performance of asphalt, and prolong the service life of the pavement. Polymers commonly used in asphalt modification mainly include thermoplastic elastomers, rubbers and thermoplastic resins. Styrene-butadiene-styrene thermoplastic elastomer (SBS) can well modify the high and low temperature properties of asphalt, and is widely used in the production of modified asphalt, but its price is ...

Examples

Embodiment 4

[0032] Example 4: Grinding styrene-butadiene-styrene thermoplastic elastomer (SBS) and waste tire rubber powder into powder through a pulverizer to obtain SBS powder and rubber powder; Put 50 parts by weight of rubber powder and 50 parts by weight of SBS powder into the blending reactor of the extruder, and the reaction product is water-cooled, pelletized and dried to obtain a solid SBS / rubber powder blend. By weight percentage, weigh 82.5% base asphalt, add 12% SBS / rubber powder blend, 5% compatibilizer, 0.5% stabilizer, stir and mix for 4 hours at 175-185°C to obtain a composite modified Asphalt 4#, the performance indicators are shown in Table 1.

Embodiment 5

[0033] Example 5: Grinding styrene-butadiene-styrene thermoplastic elastomer (SBS) and waste tire rubber powder into powder through a pulverizer to obtain SBS powder and rubber powder; 95 parts by weight of rubber powder and 5 parts by weight of SBS powder were put into the blending reactor of the extruder, and the reaction product was cooled by roller calendering and formed into sheets to obtain a solid SBS / rubber powder blend. According to weight percentage, weigh 90.5% base asphalt, add 3% SBS, at 130 ℃, use high-speed shear disperser to cut, add 1% SBS / rubber powder blend, 5% compatibilizer, 0.5% Stabilizer, stirred and mixed at 175°C for 4 hours to prepare composite modified asphalt 5#, the performance indicators are shown in Table 1.

Embodiment 6

[0034] Example 6: Grinding styrene-butadiene-styrene thermoplastic elastomer (SBS) and waste tire rubber powder into powder through a pulverizer to obtain SBS powder and rubber powder; 90 parts by weight of rubber powder and 10 parts by weight of SBS powder were put into the blending reactor of the extruder, and the reaction product was water-cooled, pelletized and dried to obtain a solid SBS / rubber powder blend. By weight percentage, weigh 72.5% base asphalt, add 2% SBS, and cut it with a high-speed shear disperser at 140°C, add 20% SBS / rubber powder blend, 5% compatibilizer, 0.5% Stabilizer, stirred and mixed at 180°C for 4 hours to prepare composite modified asphalt 6#, the performance indicators are shown in Table 1.

technical field

[0001] The invention relates to a preparation method of road asphalt, in particular to a preparation method of a storage-stable composite modified asphalt. Background technique

[0002] With the increase of road traffic volume, load capacity and vehicle speed, the requirements for asphalt pavement are more stringent. Not only will there be no rutting and pushing under high temperature, but also no cracking and loosening under low temperature and rain erosion. Practice has proved that polymer modified asphalt can significantly reduce temperature sensitivity, improve the road performance of asphalt, and prolong the service life of the pavement. Polymers commonly used in asphalt modification mainly include thermoplastic elastomers, rubbers and thermoplastic resins. Styrene-butadiene-styrene thermoplastic elastomer (SBS) can well modify the high and low temperature properties of asphalt, and is widely used in the production of modified asphalt, but its price is ...

Examples

Embodiment 4

[0032] Example 4: Grinding styrene-butadiene-styrene thermoplastic elastomer (SBS) and waste tire rubber powder into powder through a pulverizer to obtain SBS powder and rubber powder; Put 50 parts by weight of rubber powder and 50 parts by weight of SBS powder into the blending reactor of the extruder, and the reaction product is water-cooled, pelletized and dried to obtain a solid SBS / rubber powder blend. By weight percentage, weigh 82.5% base asphalt, add 12% SBS / rubber powder blend, 5% compatibilizer, 0.5% stabilizer, stir and mix for 4 hours at 175-185°C to obtain a composite modified Asphalt 4#, the performance indicators are shown in Table 1.

Embodiment 5

[0033] Example 5: Grinding styrene-butadiene-styrene thermoplastic elastomer (SBS) and waste tire rubber powder into powder through a pulverizer to obtain SBS powder and rubber powder; 95 parts by weight of rubber powder and 5 parts by weight of SBS powder were put into the blending reactor of the extruder, and the reaction product was cooled by roller calendering and formed into sheets to obtain a solid SBS / rubber powder blend. According to weight percentage, weigh 90.5% base asphalt, add 3% SBS, at 130 ℃, use high-speed shear disperser to cut, add 1% SBS / rubber powder blend, 5% compatibilizer, 0.5% Stabilizer, stirred and mixed at 175°C for 4 hours to prepare composite modified asphalt 5#, the performance indicators are shown in Table 1.

Embodiment 6

[0034] Example 6: Grinding styrene-butadiene-styrene thermoplastic elastomer (SBS) and waste tire rubber powder into powder through a pulverizer to obtain SBS powder and rubber powder; 90 parts by weight of rubber powder and 10 parts by weight of SBS powder were put into the blending reactor of the extruder, and the reaction product was water-cooled, pelletized and dried to obtain a solid SBS / rubber powder blend. By weight percentage, weigh 72.5% base asphalt, add 2% SBS, and cut it with a high-speed shear disperser at 140°C, add 20% SBS / rubber powder blend, 5% compatibilizer, 0.5% Stabilizer, stirred and mixed at 180°C for 4 hours to prepare composite modified asphalt 6#, the performance indicators are shown in Table 1.

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