Colle cyano « souple ».

Colle cyano « souple ».
voir aussi, « colles et collages, collages insolites.. ». Colles fortes les plus utilisées   par les bricoleurs et les bricoleuses.

La colle « cyanoacrylate » est à l’origine destinée à l’industrie pour le collage des métaux. Elle est naturellement d’une fluidité extrême, (commercialisée sous tube vert) qui lui permet de coller par infiltration! Il est vrai que dans cet état, l’utiliser est un défit tant il y en a immédiatement partout avant même d’avoir compris ce qui se passe. Devant l’intérêt commercial, elle a donc vite été « domestiquée » pour des usages familiaux, sous la forme de gels ou de fluide épaissi. Moins efficace mais encore très utile, elle est devenue multi matériaux. GRAND DANGER les yeux, surtout en ouvrant le tube car sous sa forme liquide, même un peu épaissie, elle peut gicler.

Contrairement aux colles avec solvant, elle ne sèche pas à l’air ni à la chaleur, mais durcit avec l’humidité de l’air, sans aimer être mouillée, du tout. Pour accélérer la prise, exhalez votre haleine humide dessus ! Insensible à l’humidité une fois prise, elle résiste très bien à la chaleur (plus de 100°).

Il m’arrive de chauffer un tube de colle cyano devant une lampe halogène ou au sèche cheveux. Cela la fluidifie et peut améliore l’infiltration.

Repérée en 2019, j’ai testé la colle cyano « Loctite » 60 secondes, universelle (20 gr). Une colle qui est annoncée comme étant souple et c’est bien ce qui a retenu mon attention, car je me doutais que c’était une « cyano » dissimulée.

Voici un collage type d’extrémité de ceinture cuir repliée afin de replacer la boucle suite à un raccourcissement de la ceinture (boucle non représentée).
La vidéo permet de constater que le cuir demeure suffisamment souple.

Collage de tissu.
Il s’agit ici d’un tissu assez fin sur lequel j’ai fait couler une couche de colle épaisse. Le verdict est celui de tout tissu imprégné de colle Cyano, il se casse ! On voit ici quatre pointes soulevées alors que je l’avait plié deux fois en croix.

Le même tissu est cette fois replié sur lui-même pour être collé avec une couche de colle mince : il peut être plié sans trop de raideur et sans se casser. Le collage tient bien mais en forçant, on parvient à détacher les deux parties collées. Ce n’est qu’une vérification de véracité, à vous d’en faire usage à l’occasion.

La colle est intéressante pour d’autres usages, tels que verre sur verre (dépoli) ou métal, ainsi que pour son prix pour 20 grammes.

Je dois à cette colle cyano souple d’être parvenue à faire tenir des « topettes » sur une semelle de chaussures « Geox » détériorée alors qu’aucune autre colle n’y était parvenue. voir aussi, « colles et collages, collages insolites.. ».

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