Low-modulus high-damping rubber for building and preparation method thereof

Abstract

The invention relates to low-modulus high-damping rubber for a building. Raw materials comprise a crude rubber matrix, carbon black, a plasticizer, a flame retardant, a damping filling material, an anti-aging agent, an antioxidant and a cross-linking agent; the crude rubber matrix is halogenated butyl rubber, and is prepared from chlorinated butyl rubber and brominated butyl rubber; the damping filling material is graphene or a fatty-acid metal salt or is prepared from the graphene and the fatty-acid metal salt. The crude rubber matrix is first subjected to thin-passing for 5 to 10 times by adopting an open mixer or an internal mixer; the carbon black, the plasticizer, the flame retardant, the anti-aging agent, the antioxidant, the damping filling agent and the cross-linking agent are added into the crude rubber matrix in sequence according to a proportion, and an obtained mixture is uniformly mixed; when the antioxidant is added, a mixing temperature is controlled to be 100 to 120 DEG C, a mixing temperature at other time is controlled to be 70 DEG C or below, and an overall mixing time is controlled to be 10 to 20 minutes; afterwards, a proper amount of mixed rubber is put into a corresponding mold, and is subjected to vulcanization molding in a press vulcanizer. The low-modulus high-damping rubber has the hardness which is 35 to 40 (shore A) while having high damping, and is low in horizontal stiffness; the shock insulation effect cannot be decreased.

Description

technical field [0001] The invention relates to a low-modulus high-damping rubber for construction and a preparation method thereof by molding, which is suitable for preparing low-shear modulus high-damping shock-isolation bearings for construction. Background technique [0002] Earthquake is a kind of extremely harmful random natural disaster. The occurrence of earthquake brings great disaster to human beings; the most advanced base isolation technology is to connect the upper building structure with the lower foundation through the damping rubber bearing used in the building. Structural isolation. The basic principle of seismic isolation of damping rubber bearings for buildings is to extend the natural vibration period of the entire building by adding rubber isolation bearings to reduce the seismic response of the upper structure. The general practice is to set up rubber isolation bearings at the bottom of the building, and use the horizontal flexibility of the rubber iso...

AI Technical Summary

Problems solved by technology

Although the increase in the hardness of the rubber material can increase the damping coefficient (shock isolation effect), it will lead to a decrease in the shock isolation effect due to the increase in the horizontal stiffness of the overall support. At present, there are high damping rubber materials with a hardness of more than 70 Shore A on the market. support