Sealant composition

Abstract

The invention belongs to the technical field of sealants, and particularly discloses a sealant composition which is prepared from the following raw materials in parts by weight: 100 parts of a base material, 20-40 parts of modified filler, 0.3-0.9 part of expanded microspheres, 6-20 parts of a thixotropic agent, 0.5-3 parts of a light stabilizer, 0.5-5 parts of a coupling agent, 3-5 parts of a curing agent, 10-20 parts of a plasticizer, 0.5-3 parts of a catalyst and 2-8 parts of an adhesion promoter, the expanded microspheres with large volume and small mass are used as the light filler, an excellent weight reduction effect can be achieved by adding a small amount of the expanded microspheres, the density of the sealant is remarkably reduced, the sealant is convenient to transport, a small amount of the expanded microspheres can replace most of raw materials, and the production and transportation cost is greatly reduced; the ultraviolet absorbent, the light stabilizer and the antioxidant are effectively compounded through structure optimization to obtain the light stabilizer, the problem that the sealant is resistant to yellowing after being used for a long time is solved, and meanwhile, the tea polyphenol type antioxidant introduced into the light stabilizer also has antibacterial and mildew-proof effects.

Description

technical field [0001] The invention belongs to the technical field of sealants, and in particular relates to a sealant composition. Background technique [0002] Sealant is a sealing material that bonds the surfaces of the same or different solid materials together, or is used to fill the gaps in the material, and acts as a sealant. It is a kind of adhesive that is leak-proof, waterproof, Anti-vibration and heat insulation, sound insulation and other functions. Sealants have been widely used in aerospace, automobile transportation, machinery manufacturing, material processing, electronic appliances, national defense and military industry, building materials, petrochemical industry, printing and binding, light industry and textile, medical and health care, and daily life. [0003] The existing sealant composition is prone to sagging or tailing phenomenon during use. Smearing phenomenon, that is, using a glue gun to apply the sealant on the weld seam. When the required leng...

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Problems solved by technology

[0003] Existing sealant compositions are prone to sagging or tailing during use

Smearing phenomenon, that is, using a glue gun to apply the sealant on the weld seam. When the required length of glue extrusion is completed, the gun is lifted. Due to the viscosity of the glue and the inertia of extrusion, there is still a part of the glue remaining on the car body. The phenomenon is called tailing phenomenon, which leads to unsightly bonding, and after a long time, the sealant is prone to aging and yellowing

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