Low temperature resistant environmentally-friendly sealant and preparation method thereof

Abstract

The invention discloses a low temperature resistant environmentally-friendly sealant. The low temperature resistant environmentally-friendly sealant comprises the following raw materials in parts by weight: 42 to 46 parts of blocking polydimethylsiloxane, 28 to 32 parts of modified epoxy resin, 14 to 18 polytetrafluoroethylene, 16 to 22 parts of silica fume, 8 to 14 parts of a cross-linking agent,6 to 10 parts of a binder, 5 to 9 parts of a king sundew, 6 to 10 parts of epoxidized soybean oil, 1 to 3 parts of p-phenylenediamine and 2 to 6 parts of butyl cellosolve. According to the low temperature resistant environmentally-friendly sealant provided by the invention, compared with the prior art, the low temperature resistance of the sealant is greatly improved, and the sealant has preferable use value and good application prospect.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a low-temperature resistant and environment-friendly sealant and a preparation method thereof. Background technique [0002] The sealant can replace the imported oil-resistant sealant. It is used as a complete set for all automobile manufacturers, agricultural vehicle factories, forklift factories, diesel engine factories, shipyards and other manufacturers. It can be used in electric power, chemical industry, machinery, gearboxes, oil tanks, oil bottoms, Oil, gas and water sealing of cork pads, front and rear axles, front and rear end covers, etc. It is also suitable for detachable joint surfaces or flanges of automobiles, motorcycles and other engines, water pumps, valves, gear boxes, reduction boxes, etc. It can also be used for detachable thread sealing, and the silicone sealant has strong gap filling ability, aging resistance, and surface curing is less than 20 minutes. Comp...

AI Technical Summary

Problems solved by technology

[0003] The existing Chinese patent document (publication number: CN105086921B) discloses a low-temperature resistant silicone sealant, which is made of the following components in parts by weight: 100 parts of blocked polydimethylsiloxane, 5 parts of plasticizer ~10 parts, 15~20 parts of filler, 3~10 parts of crosslinking agent, 1~2 parts of catalyst, 0.5~1 part of coupling agent, 1~2 parts of stabilizer, 1.5~2 parts of anti-aging agent, 2 parts of tackifier ~6 parts, 4~5 parts of solubilizer PE-g-MAH, 10~12 parts of polysulfone, 14~15 parts of calcium carbonate hollow microspheres, the low temperature resistance of the invention components is mainly composed of calcium carbonate hollow microspheres, polysulfone Provided by sulfone, the compatibility between the two is poor, which in turn reduces the low temperature resistance

[0004] Chinese patent literature (publication number: CN105086925B) discloses a new type of environmentally friendly flame-retardant silicone sealant and its preparation method, including the following components in parts by weight: 100 parts of α, ω-dihydroxy polysiloxane, polydimethyl 1~50 parts of base siloxane, 5~150 parts of filler, 1~10 parts of phosphorus silicon flame retardant, 1~15 parts of crosslinking agent, 0.1~3 parts of catalyst, 0.5~4 parts of coupling agent, the sealant Although it has flame retardant function, it has poor low temperature resistance