High-temperature-resistant sealing rubber strip for vacuum forming
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A sealing strip and vacuum forming technology, applied in the direction of adhesives, non-polymer adhesive additives, rosin adhesives, etc., can solve the problems of product pollution, detachment from the mold, melting and flowing, etc., and achieve enhanced thermal and oxygen aging resistance , excellent high temperature resistance, uniform distribution of components
Inactive Publication Date: 2021-05-04
江苏艾合复合材料有限公司
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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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Embodiment 1
[0032] 60 parts of butyl rubber, 20 parts of brominated butyl rubber, 50 parts of rosin resin, 100 parts of polyisobutylene, 180 parts of light calcium carbonate, 20 parts of kaolin, 20 parts of talcum powder, 201 brominated hydroxymethyl tert-octylphenolic novolac 6 parts of resin, 2 parts of zinc oxide, 1 part of RD antioxidant, 1 part of phthalocyanine green.
[0033] The preparation method is as follows: each component is masticated by an open mill, kneaded by a kneader, and extruded by an extruder.
Embodiment 2
[0035] 70 parts of butyl rubber, 10 parts of bromobutyl rubber, 30 parts of rosin resin, 120 parts of polyisobutylene, 150 parts of heavy calcium carbonate, 50 parts of kaolin, 50 parts of talc, 2,6-hydroxydimethyl-4 - 15 parts of chlorophenol resin, 2 parts of stannous chloride, 2 parts of NBC antioxidant, 30 parts of iron red.
[0036] The preparation method is as follows: each component is masticated by an open mill, kneaded by a kneader, and extruded by an extruder.
Embodiment 3
[0038] 50 parts of butyl rubber, 30 parts of brominated butyl rubber, 30 parts of rosin resin, 120 parts of polyisobutylene, 180 parts of nano calcium carbonate, 30 parts of kaolin, 20 parts of barium sulfate, 201 brominated hydroxymethyl tert-octyl phenolic resin 10 parts, 5 parts of ferric chloride, 5 parts of 1010 antioxidant, 5 parts of carbon black.
[0039] The preparation method is as follows: each component is masticated by an open mill, kneaded by a kneader, and extruded by an extruder.
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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...
Claims
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Application Information
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