Low modulus silicone sealing gum and its manufacturing method

A silicone sealant, low modulus technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of inability to ensure long-term sealing of joints, unsatisfactory concrete adhesion, and large permanent deformation of the sealant. Achieve excellent displacement ability, excellent expansion and recovery ability, and the effect of small permanent deformation
CN1618915AActive Publication Date: 2005-05-25CHENGDU GUIBAO SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU GUIBAO SCI & TECH
Publication Date
2005-05-25

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Abstract

A low-modulus silicone sealant for the expansion joint of express way, airport runway, tunnel, bridge, etc is prepared from alpha, omega-dihydroxy polydimethyl siloxane and filler through proportionally vacuum kneading at 80-150 deg.C while dewatering for 30-300 min, high-speed stirring while cooling to obtain basic material, proportionally mixing chain enlarging agent, cross-linking agent, thixotropic agent, polydimethyl siloxane and toluent diisocyanate, stirring, and vacuum reaction at 20-600 rpm for 30-90 min.
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Description

1. Technical field

[0001] The invention relates to a low-modulus silicone sealant and a manufacturing method thereof, belonging to the field of polymer sealing materials. 2. Background technology

[0002] In order to adapt to the expansion and bending caused by external factors, such as temperature changes, concrete buildings are equipped with expansion joints during construction. Expansion joints are the weak link of concrete buildings. First, foreign matter accumulates in the gaps, hindering the normal expansion and contraction of the joints; second, the joints seep water, which erodes and softens the subgrade, so the expansion joints must be sealed. The concrete joint sealing materials currently used in China mainly include asphalt, modified asphalt, prefabricated neoprene, polysulfide and polyurethane materials. Service life of concrete buildings. These materials are toxic and easily pollute the environment. Silicone sealing material has excellent weathering resistanc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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