Single-component modified silicone flame-retardant sealant and preparation method thereof

Abstract

The invention discloses a single-component modified silicone flame-retardant sealant and a preparation method thereof, and belongs to the field of high polymer materials. According to the single-component modified silicone flame-retardant sealant disclosed by the invention, siloxane-terminated polyether resin is used as a colloid skeleton raw material, so that the definition of modified silicone in national standard is met, and meanwhile, the problems that a traditional silicone adhesive product is poor in adhesion to a porous material, silicone oil is separated out and causes pollution, and surface coating cannot be carried out can be effectively solved; a halogen-free environment-friendly flame retardant is used, so that toxic gases such as halogen hydride and the like cannot be released due to high temperature under the condition of ensuring the flame retardant effect; and by matching with other components such as a UV-aging-resistant agent and a plasticizer, the obtained flame-retardant sealant product also has good mechanical properties and weather resistance and durability. The invention further provides a preparation method of the single-component modified silicone flame-retardant sealant, the method is simple in operation steps and low in requirements on instruments and process conditions, and industrial large-scale production can be realized.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a single-component modified silicone flame-retardant sealant and a preparation method thereof. Background technique [0002] With the continuous development of the construction industry and the emergence of new construction methods, the requirements for the flame retardancy of construction sealants are getting higher and higher. The fire resistance limit of steel is very short, generally only 15 minutes. Under the action of high temperature, the mechanical properties of steel will decline rapidly, leading to the collapse of buildings and causing heavy casualties. Compared with concrete structures, steel structures have poor fire resistance and corrosion resistance. Therefore, in order to improve the fire performance of steel structures, the sealants used in them also need to be flame retardant. [0003] Most of the flame-retardant sealants in the market are traditiona...

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Problems solved by technology

[0003] Most of the flame-retardant sealants in the market are traditional silicone-type flame-retardant sealants, which are used in steel structures and other buildings. There are several problems: (1) Silicone oil is precipitated and vertical flow pollution occurs; (2) Elongation Low, not suitable for steel structures with relatively large deformation joints; (3) poor environmental protection, using bromine-containing flame retardants, high-temperature combustion releases toxic gases, which can suffocate people to death; (4) the surface cannot be painted, Paint and other decorative coatings

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