{"id":18,"date":"2020-05-27T23:40:20","date_gmt":"2020-05-27T23:40:20","guid":{"rendered":"https:\/\/hotmelts.eu\/?page_id=18"},"modified":"2021-09-20T10:11:11","modified_gmt":"2021-09-20T10:11:11","slug":"reactive-pur","status":"publish","type":"page","link":"https:\/\/hotmelts.eu\/cs\/reactive-pur\/","title":{"rendered":"Reaktivn\u00ed PUR"},"content":{"rendered":"<p>Reaktivn\u00ed tavn\u00e1 lepidla jsou na b\u00e1zi polyurethanu (PUR).<\/p>\n\n\n\n<p>Posloupnost adhezivn\u00ed reakce<br>Tavn\u00e1 lepidla vytvrzovan\u00e1 vlhkost\u00ed se spojuj\u00ed dvoustup\u0148ovou reakc\u00ed:<\/p>\n\n\n\n<p>V prvn\u00ed f\u00e1zi proch\u00e1z\u00ed lepidlo mechanismem fyzik\u00e1ln\u00edho tuhnut\u00ed, kter\u00fd d\u00e1v\u00e1 adhezi ur\u010dit\u00fd stupe\u0148 pevnosti. Tato s\u00edla je dostate\u010dn\u00e1 pro dal\u0161\u00ed zpracov\u00e1n\u00ed nebo p\u0159epravu.<\/p>\n\n\n\n<p>Ve druh\u00e9 f\u00e1zi, kter\u00e1 m\u016f\u017ee trvat hodiny a\u017e dny v z\u00e1vislosti na typu lepidla, doch\u00e1z\u00ed k chemick\u00e9mu dodate\u010dn\u00e9mu zes\u00ed\u0165ov\u00e1n\u00ed. Tato chemick\u00e1 reakce z\u00e1vis\u00ed na obsahu vlhkosti a p\u0159\u00edstupnosti lepen\u00e9ho spoje k vlhkosti vzduchu. Pot\u00e9, co tavn\u00e9 lepidlo zreagovalo, ztratilo sv\u00e9 termoplastick\u00e9 vlastnosti, tj. Op\u011bt nezm\u011bklo, i kdy\u017e se lepen\u00fd p\u0159edm\u011bt zah\u0159\u00e1l. V\u00fdsledn\u00fd termoset m\u00e1 v\u00fdjime\u010dn\u011b dobr\u00e9 hodnoty adheze polyurethanu v kombinaci s vysokou pevnost\u00ed, vysokou tepelnou odolnost\u00ed, dobrou flexibilitou p\u0159i n\u00edzk\u00fdch teplot\u00e1ch a dobrou odolnost\u00ed v\u016f\u010di rozpou\u0161t\u011bdl\u016fm.<\/p>","protected":false},"excerpt":{"rendered":"<p>Reactive hot melt adhesives are based on polyurethane (PUR). Sequence of the adhesive reactionThe moisture-curing hotmelt [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-full-width.php","meta":{"footnotes":""},"class_list":["post-18","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Reactive PUR - Hotmelt adhesives<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hotmelts.eu\/cs\/reactive-pur\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reactive PUR - Hotmelt adhesives\" \/>\n<meta property=\"og:description\" content=\"Reactive hot melt adhesives are based on polyurethane (PUR). 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