A kind of uv light and heat dual curing high airtight polyisobutylene adhesive and preparation method thereof

Abstract

The invention relates to a UV light and heat dual-curing high-air-tightness polyisobutylene adhesive and a preparation method thereof. Under the condition of eliminating ultraviolet light or in a yellow light room, 40 to 100 parts of vinyl-terminated polyisobutylene are polymerized in parts by weight. 30-100 parts of maleic anhydride-terminated polyisobutylene polymer, 10-50 parts of epoxy resin, 5-15 parts of inorganic filler, 5-15 parts of polyalpha-olefin plasticizer, 0.05-5 parts of silane coupling agent, 0.01~1 part of anti-aging agent, 0.05~2 parts of hydrogen-containing silicone oil, 1.0~10×10 ‑6 Parts of UV photoinitiator, 1.0~10×10 ‑5 parts catalyst, 5~100×10 ‑6 Put 100% maleic acid ester inhibitors into a planetary mixer in turn for 1 hour of vacuum stirring, and then vacuum stirring for 0.5 hour to obtain a viscous adhesive composition. Compared with the prior art, the invention has the advantages of high bonding strength, good air tightness, good curing effect and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a UV light and heat dual-curing high air-tightness polyisobutylene glue and a preparation method thereof. Background technique [0002] For applications requiring high gas tightness, such as hydrogen seals in hydrogen fuel cell bipolar plates, the best seal material at present is polyisobutylene. Polyisobutylene has the smallest gas permeability and moisture permeability among all air-tight materials. At the same time, because the main chain of the molecule is a saturated hydrocarbon structure, it has excellent heat resistance, good ozone aging resistance, excellent Corona resistance and insulation, good chemical stability. Polyisobutylene has excellent water resistance, low water vapor and gas permeability, and is often used in sealing applications that require extremely high barrier properties to hydrogen, oxygen and water vapor. [0003] Polyisobutylene sealants come in two ...

AI Technical Summary

Problems solved by technology

[0004] Due to the introduction of a large amount of hydrogen-containing silane crosslinking agent in the hydrosilylation reaction, the Si-O bond content in the molecular chain of the cured product increases. Compared with the C-C bond, the molecular distance increases, the free volume becomes larger, and the gas barrier performance decreases.

[0005] Although moisture-curing polyisobutylene has no risk of poisoning the platinum catalyst in the hydrosilylation system, the excellent gas barrier properties of polyisobutylene just prevent the moisture in the air from penetrating into the sealant, affecting the deep curing of the sealant

[0006] UV light-curable polyisobutylene has fast curing speed, short time and low curing temperature, but there are problems such as curing depth, non-curing in shadow areas, difficult curing of opaque materials, and oxygen inhibition.

[0007] At present, the bonding strength of polyisobutylene rubber cured by hydrosilylation, moisture and UV light is generally relatively low, and the applicable bonding substrates are limited.

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