High-temperature-resistant sealing rubber strip for vacuum forming

Abstract

The invention discloses a high-temperature-resistant sealing rubber strip for vacuum forming, which is characterized in that butyl rubber and brominated butyl rubber are used as base rubber, rosin resin and polyisobutene are used as tackifiers, calcium carbonate, kaolin, talcum powder, barium sulfate and the like are used as fillers, and a vulcanization accelerator, an anti-aging agent, a phenolic resin vulcanizing agent and a pigment are added; and plasticating is carried out by an open mill, kneading is carried out by a kneading machine, and extruding and molding are carried out by an extruder to form the high-temperature-resistant sealing rubber strip. No plasticizer is added, so that the defect that the plasticizer migrates to the surface of the adhesive tape does not exist. In addition, that during vacuumizing, overall air leakage is avoided, no adhesive is left after demolding, the high temperature resistance is good, and the composite material curing temperature of 230 DEG C can be tolerated.

Description

technical field [0001] The invention relates to a sealing rubber strip, in particular to the technical field of a high temperature resistant sealing rubber strip for vacuum forming. Background technique [0002] Resin-based composite materials are widely used in advanced aircraft, missiles, rockets, etc. At present, vacuum infusion molding, vacuum bag pressing molding and autoclave molding processes are mostly used in the molding of composite materials. Because the vacuum forming process is flexible, simple, efficient, Excellent quality and other characteristics, which have been widely used. With the continuous advancement of technology, the matrix resin of high-performance composite materials has gradually changed from low-temperature epoxy resin to high-temperature bismaleimide, cyanate ester, polyimide, etc. During the vacuum forming process, a reliable seal is required between the vacuum bag film and the mold. Therefore, there is a need for a sealing strip that can eff...

AI Technical Summary

Problems solved by technology

There are some problems in the existing sealant strips: (1) poor initial adhesion: because the laying of the sealant strips is achieved manually, the adhesive strips with poor initial adhesion will not be tightly bonded during the construction process, There is even a phenomenon of detachment from the mold, resulting in air leakage during the production process; (2) Insufficient temperature resistance: the temperature resistance of common butyl rubber products is only about 160 °C, and it will be damaged when it is higher than 200 °C. The phenomenon of melting and flowing

The vacuum forming process is a process of vacuuming while heating, so the sealant strip cannot achieve any sealing effect under ultra-high temperature; (3) Plasticizer migration: plasticizer is added to the traditional rubber formula for the convenience of mastication (4) Vulcanization rate: due to the high saturation of butyl rubber and bromobutyl rubber, the vulcanization The speed is slow, which has caused the reaction temperature to rise, but the rubber strip has not been vulcanized and deformed, which affects the air tightness; (5) The cleanliness of demoulding: In order to facilitate the subsequent second construction, many production The unit requires easy demoulding for the sealing strip, and no residue on the mold after use is allowed, which is also a defect of the existing technology

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