Special flow type silicone sealant for road

Abstract

The invention discloses a special flow type silicone sealant for a road. The special flow type silicone sealant for the road comprise raw materials in parts by weight as follows: 54-58 parts of room temperature vulcanized methyl silicone rubber with the viscosity of 1,200-1,600 mPa*s, 115-125 parts of room temperature vulcanized methyl silicone rubber with the viscosity of 18,000-20,000 mPa*s, 210-220 parts of silica powder, 122-130 parts of nano calcium carbonate, 0.1-1 part of di-n-butyltin dilaurate, 22-30 parts of methyltris(methylethylketoxime)silane, 5-10 parts of vinyltris(methylethylketoxime)silane and 1-2 parts of a coupling agent. The special flow type silicone sealant for the road has excellent high-low-temperature resistance and weather aging resistance, cannot deform in an environment with the too high or too low temperature and has good extensibility, elasticity, convenience in construction and long service life.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a special silicone sealant for flowing roads. Background technique [0002] Cement concrete pavement has the advantages of large bearing capacity, good stability, long service life, and low maintenance cost. Cement concrete pavement is widely used on the main and secondary arterial roads of highways and urban roads, and has also been used in expressways in the past ten years. Rapid development. However, whether it is highways, airports, railways, urban roads or municipal facilities, the renovation rate is very high. The reason is that the thermal expansion coefficient of concrete is relatively large, and all concrete pavements are equipped with joints during construction to adapt to environmental changes. The joint is the weak link in the concrete slab structure. If the joint is not well sealed, the rainwater will easily seep into the ground, and the long-term eros...

AI Technical Summary

Problems solved by technology

Asphalt and modified asphalt have no bonding strength with concrete, poor elasticity, easy to flow at high temperature, brittle at low temperature, and short service life. After 1 to 2 years, the joint filling material will still be damaged, which will also cause plate settlement or fracture or even road collapse; Polysulfide and polyurethane sealants have good oil resistance and high and low temperature resistance, but their displacement capacity is insufficient. In practical applications, joint debonding or cohesive cracking commonly occurs, thus losing reliable sealing and waterproof effects, and their resistance The UV aging performance is not very good, and it can be used for 2 to 3 years. Generally, it must be repaired or refilled after 3 years

Due to the shortcomings of the above-mentioned materials themselves, when the above-mentioned materials are used as the joint filling materials for the joints of cement concrete pavement, the above-mentioned materials themselves or the bonded pavement are easily damaged, forming gaps, causing rainwater to enter along the gaps to soften and damage the roadbed. Carrying out regular maintenance on the road causes expensive road maintenance costs and wastes resources. Therefore, it is urgent to find a new road joint filler

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