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改善α-氰基丙烯酸酯胶黏剂/502瞬间胶储存稳定性和提高固化速度的方法有哪些?

α-氰基丙烯酸酯单体,主要以负离子方式或自由基方式反应。因此,为了提高制备产率和改善储存稳定性必须同时加入两类阻聚剂:一类是以氢醌、对甲氧基酚或受阻酚等酚类化合物为代表的自由基型阻聚剂,使用浓度为0.1%~1.0%,目的在于防止热、光和其他可能的自由基源引起的过早聚合,如用量合适一般不会影响负离子聚合的固化速度;另一类是负离子阻聚剂,酸性二氧化硫气体是有效而广泛使用的负离子阻聚剂。也曾有人使用HF、SO3和NO2等酸性气体。

与酸性物质相反,碱性物质则有引发α-胶发生负离子聚合的作用,醇、环氧化合物、仲胺或叔胺、乙醇胺、咖啡和三氮杂苯等均可和适当的溶剂制成底胶,在涂α-胶之前施用可加速α-胶的固化。特别是在粘接酸性材料(如木材)、多孔材料和粘接大间隙部件时,普通α-胶必须配以适当的底胶使用。上述碱性物质起了负离子引发剂的作用,只能作底胶用。亚乙基醚类化合物配入胶中,既可加速固化,又不影响储存稳定性。

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α- Cyanoacrylate monomer mainly reacts in the form of anion or free radical. Therefore, in order to improve the preparation yield and storage stability, two kinds of polymerization inhibitors must be added at the same time: one is the free radical polymerization inhibitor represented by hydroquinone, p-methoxyphenol or hindered phenol, with the concentration of 0.1% - 1.0%, in order to prevent premature polymerization caused by heat, light and other possible free radical sources, If the dosage is appropriate, the curing rate of anionic polymerization will not be affected; The other is negative ion polymerization inhibitor, acid sulfur dioxide gas is an effective and widely used negative ion polymerization inhibitor. Acid gases such as HF, SO3 and NO2 have also been used.

In contrast to acidic substances, alkaline substances have an initiating effect α- Alcohol, epoxy compound, secondary amine or tertiary amine, ethanolamine, coffee and triazine etc. can be used together with suitable solvents to make primer α- Application before glue can speed up the process α- Curing of adhesive. Especially in the bonding of acidic materials (such as wood), porous materials and large gap components, the common bonding method is simple α- Glue must be used with proper primer. The above alkaline substances act as negative ion initiators and can only be used as primer. The results showed that the curing speed of the adhesive was accelerated and the storage stability was not affected.

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