Adhesion describes the ability of two different materials to stick together. It is basically the sum of all the attractive forces acting between the surfaces of these materials. These attractive forces are mainly due to physical interactions, which include van der Waals forces and hydrogen bonds.<\/p>\n\n\n\n With reactive hot-melt adhesives, adhesion goes one step further. Here, chemical bonds can occur between the adhesive and the material to be bonded. \u00a0These chemical bonds are typically much stronger than the physical interactions that occur with non-reactive hot-melt adhesives. However, adhesion formation still depends on physical interactions between the adhesive and the substrate. \u00a0The adhesive and the part to be joined must come closer than 1 nanometer within the so-called \u201copen time\u201d of the adhesive.<\/p>\n\n\n\n The challenge with hot-melt adhesives<\/strong><\/strong><\/p>\n\n\n\n One of the special challenges with hot-melt adhesives is the rapid increase in viscosity after application. This increased viscosity makes it more difficult to wet the surfaces and thus to bridge the small distance of less than 1 nanometer between the parts to be connected.<\/em><\/p>\n\n\n\n In addition to the time factor, pressure also plays a crucial role when bonding with hot-melt adhesives. Applying pressure on the substrates to be bonded improves adhesion.<\/p>\n\n\n\n Mechanical adhesion \u2013 an additional help<\/strong><\/strong><\/p>\n\n\n\n Another interesting aspect of adhesion is the so-called \u201cmechanical adhesion\u201d or mechanical anchoring. \u00a0The assumption here is that the adhesive penetrated the tiny pores and unevenness in the material to be joined and thus adheres to it. This mechanism further contributes to the strength of the connection.<\/p>\n\n\n\n The complex world of adhesion<\/strong><\/strong><\/p>\n\n\n\n Adhesion is a fascinating and complex area, which is still being intensively researched. There are various theories to describe adhesion, because the interactions between the different adhesive systems and the surfaces of the materials to be bonded are extremely complex. Scientists are constantly working to better understand the fundamentals of adhesion, in order to develop more effective and reliable bonding processes.<\/p>\n\n\n\n In the world of hot-melt adhesives, adhesion is a crucial factor that determines the quality and durability of connections. The combination of physical interactions, chemical bonds, pressure and mechanical anchoring makes adhesion an impressive phenomenon that forms the basis of many modern adhesive technologies.<\/p>\n","protected":false},"excerpt":{"rendered":" The fascinating world of hot-melt adhesives. What is adhesion? Our Tuesday\u00b4s facts explains <\/p>\n","protected":false},"author":1,"featured_media":157,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[24],"tags":[],"class_list":["post-164","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-term-tuesday"],"jetpack_featured_media_url":"https:\/\/www.buehnen.de\/international\/blog\/wp-content\/uploads\/2023\/09\/thuesdays_facts.webp","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/posts\/164","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/comments?post=164"}],"version-history":[{"count":1,"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/posts\/164\/revisions"}],"predecessor-version":[{"id":166,"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/posts\/164\/revisions\/166"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/media\/157"}],"wp:attachment":[{"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/media?parent=164"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/categories?post=164"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.buehnen.de\/international\/blog\/wp-json\/wp\/v2\/tags?post=164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/www.buehnen.de\/international\/blog\/wp-content\/uploads\/2023\/10\/adhesion.jpg\")
<\/figure>\n\n\n\nReactive hot-melt adhesives and chemical bonds<\/strong><\/strong><\/h3>\n\n\n\n
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