Low-modulus high-elongation and high-thixotropy ageing-resistant sealant and preparation method thereof

Abstract

The invention discloses a low-modulus high-elongation and high-thixotropy ageing-resistant sealant and a preparation method thereof. The sealant contains silicone rubber, a filler, a reinforcing agent, a cross-linking agent, a catalyst, a plasticizer, a chain extender, a vulcanization accelerator, a pigment, a thixotropic agent, a tackifier, a stabilizer, a heat-resistant agent and a mildew preventive. The sealant has the characteristics of low modulus, high elasticity, excellent adhesive power and low-stress high elongation, is particularly applicable to special engineering requirements on joints such as caulked joints of long-span deformed displacement expansion joints of high-rise buildings and large-sized concrete facilities and has excellent adhesive property, low-stress high deformation property, high and low temperature resistances, water resistance, ageing resistance and the like; and when the sealant is used for sealing caulked joints of break joints and expansion joints of concrete pavements such as highways, bridges, expressways and airfield runways, the sealant needs to have excellent durability, namely that the sealant does not crack, embrittle and deteriorate within 30 years.

Description

technical field [0001] The invention relates to a sealant, in particular to a sealant with low modulus, high elongation, high thixotropy and aging resistance and a preparation method. Background technique [0002] With the rapid development of the national economy, my country's highway transportation industry has become more and more developed, and the annual increase in highway mileage is about 80,000km. In order to adapt to expansion and bending caused by external factors (such as temperature changes), concrete panels such as tunnels, bridges, roads, airport runways, squares, etc. are designed with expansion joints. Sealed expansion joints are the weak link in the concrete slab structure. If the joints are not well sealed, it is easy for foreign matter to accumulate in the gaps, hindering the normal expansion of the joints; in addition, it will also cause water seepage, softening and erosion of the joints Foundations, which allow plates to settle or break. So the seams m...

AI Technical Summary

Problems solved by technology

Among them, although asphalt is cheap and easy to obtain, it has poor adhesion to concrete, poor elasticity, easy to flow at high temperature, easy to be brittle at low temperature, not resistant to aging, and has a short service life (about 2 years). The sealing coatings for the gaps and expansion joints of concrete pavement such as bridges, highways, and airport runways do not have the functions of low modulus, high elongation, high thixotropy and aging resistance, resulting in high cost and short service life, which brings inconvenience to people.

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