UV light and heat dual-curing high-airtightness polyisobutene glue and preparation method thereof

Abstract

The invention relates to a UV light and heat dual-curing high-airtightness polyisobutene adhesive and a preparation method thereof. The method comprises the following steps: under the condition of eliminating ultraviolet light or in a yellow light chamber, sequentially adding 40-100 parts by weight of vinyl terminated polyisobutylene polymer, 30-100 parts by weight of maleic anhydride terminated polyisobutylene polymer, 10-50 parts by weight of epoxy resin, 5-15 parts by weight of inorganic filler, 5-15 parts by weight of poly-alpha-olefin plasticizer, 0.05-5 parts by weight of silane coupling agent, 0.01-1 part by weight of anti-aging agent, 0.05-2 parts by weight of hydrogen-containing silicone oil and 1.0-10 * 10 <-6 > parts by weight of ultraviolet light initiator, 1.0-10 * 10 <-5 > parts by weight of a catalyst and 5-100 * 10 <-6 > parts by weight of a maleate inhibitor into a planetary stirrer, carrying out vacuum stirring for 1 hour, and carrying out vacuum stirring again for 0.5 hour to obtain the viscous adhesive composition. Compared with the prior art, the adhesive 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 gas sealing of hydrogen fuel cell bipolar plates, the best sealing material is polyisobutylene. Polyisobutylene has the smallest gas permeability and moisture vapor permeability among all airtight materials, and at the same time, because the molecular main chain 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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