5results about How to "Improve low temperature ductility" patented technology

The invention relates to the technical field of asphalt preparation, in particular to SBS / waste rubber powder composite modified asphalt and a preparation method thereof.The preparation method comprises the following preparation steps that S1, matrix asphalt and modified SBS are mixed and dissolved, and after shear development, a first-order mixed and dissolved substance is obtained; s2, adding modified rubber powder into the first-order miscible substance, and shearing and developing to obtain a second-order miscible substance; and S3, adding a stabilizer into the second-order miscible substance, and stirring and cross-linking to obtain the SBS / waste rubber powder composite modified asphalt. Through the synergistic effect of the modified SBS and the modified rubber powder, the viscosity of a system is reduced, the network structure strength of the SBS is maintained, a stable physical-chemical composite network is formed in the asphalt, phase separation is not prone to occurring in the heat storage process, the low-temperature ductility of the asphalt is improved, and the composite modified asphalt still keeps good flexibility in a low-temperature environment.

The application relates to a preparation method and a phased application method of an aging SBS modified asphalt regenerant with diffusion and enhancement, and belongs to the technical field of road engineering materials and waste asphalt regeneration. A first agent and a second agent are used in stages, the first agent comprises naphthenic base oil and / or aromatic base regenerative oil, epoxy vegetable oil and / or fatty acid ester, a surface active diffusion promoter, a small molecule compatibilizer and an antioxidant, the second agent comprises maleic anhydride grafted SBS and / or maleic anhydride grafted SEBS, liquid rubber and / or hydroxyl-terminated polybutadiene, an epoxy reactive compatibilizer, tackifying resin, a non-amine type interface stabilizing aid and a complexing aid of a hindered amine light stabilizer and an ultraviolet absorber. The application can solve the problems that softening and enhancement of a traditional single-dose regenerant are difficult to be considered, the two-component synchronous adding mode is insufficient in stage control, aging SBS modified asphalt diffusion softening is insufficient, SBS elastic network repair is uneven and the durability after regeneration is insufficient.

The invention discloses a reactive cationic asphalt emulsifier and a preparation method and application thereof, and belongs to the technical field of road engineering materials, the emulsifier has a [A]-[B]-[C] three-section structure, [A] is an epoxy chain segment, [B] is a polyether chain segment (which is a polyether flexible chain segment), and [C] is a polyamine and derivative chain segment thereof. Precise regulation and control of the performance of the emulsifier can be realized by regulating and controlling the type of epoxy resin, the types of polyamine and derivatives thereof, the molecular weight of polyether (such as polyethylene glycol diglycidyl ether) and the amine hydrogen / epoxy ratio. Emulsified asphalt prepared by adopting the emulsifier has the advantages of excellent storage stability, outstanding low-temperature ductility, firm interface bonding (forming a covalent bond with asphalt) and the like, and can be widely applied to road maintenance projects such as micro-surfacing, slurry seal and cold regeneration.

The invention provides warm mix asphalt and a preparation method thereof, and belongs to the technical field of road engineering materials. The warm mix asphalt comprises the following raw materials: matrix asphalt, epoxidized soybean oil and ardealite. The epoxy soybean oil and the phosphogypsum are doped into the matrix asphalt, the matrix asphalt is subjected to compound modification, and the synergistic effect of the epoxy soybean oil and the phosphogypsum is utilized, so that the construction viscosity of the asphalt is remarkably reduced, the low-temperature ductility of the asphalt is synchronously improved, the softening point is ensured not to be excessively reduced, and the negative influence of a traditional warm mixing agent on the performance of the asphalt is effectively overcome; the low-temperature cracking resistance of the asphalt pavement is enhanced, the service life of the pavement is prolonged, and the safety and comfort of road passage are improved; besides, the epoxidized soybean oil and the ardealite are used as additives, a new resource utilization way is opened up for the epoxidized soybean oil and the ardealite, remarkable economic and environment-friendly benefits are achieved, and the development requirements of green road engineering are met.

This invention discloses a toughened-self-healing composite modified No. 50 Grade A asphalt and its preparation method, belonging to the technical field of road engineering materials. The asphalt comprises the following raw materials: 100 parts of No. 50 Grade A road petroleum asphalt; 5.0-8.0 parts of functional monomer A; 1.0-4.0 parts of self-healing microcapsules; 0.04-0.112 parts of initiator; and 0.05-0.24 parts of crosslinking agent. The functional monomer A is composed of styrene and butyl acrylate in a mass ratio of 25:75-35:65. A one-step preparation method is used, where styrene and butyl acrylate are copolymerized in situ in the asphalt and lightly crosslinked to achieve toughening, while the introduction of self-healing microcapsules imparts a self-healing function. This invention improves the low-temperature ductility, high-temperature stability, storage stability, and damage self-healing ability of asphalt, and the process is simple and controllable, making it suitable for high-grade roads and heavy-duty traffic pavements.