{"id":7479,"date":"2024-10-28T11:40:57","date_gmt":"2024-10-28T11:40:57","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=7479"},"modified":"2026-08-25T09:30:59","modified_gmt":"2026-08-25T09:30:59","slug":"reaction-mechanism-of-epoxy-resin-and-polythiol-monomer","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/nl\/reaction-mechanism-of-epoxy-resin-and-polythiol-monomer\/","title":{"rendered":"Epoxy\u2013Polythiol Cure: Reaction Mechanism & Formulation"},"content":{"rendered":"

Snel antwoord:<\/strong> Epoxy\u2013polythiol curing is a thiol\u2013epoxy addition reaction, commonly accelerated by a suitable catalyst. Cure rate and properties depend on functional-group equivalents, catalyst, temperature, moisture, mixing, exotherm and network design.<\/p>\n

Reactiemechanisme van epoxyhars en polythiolmonomeer?<\/p>\n

Het reactiemechanisme tussen epoxyharsen en polythiolen omvat voornamelijk de interactie tussen de thiolgroep en de epoxygroep. Hieronder volgt het gedetailleerde reactiemechanisme:
\nInitiatie van de reactie:<\/p>\n

Tijdens de reactie tussen polythiolen en epoxyharsen zal het niet gedeelde elektronenpaar op het tertiaire amine eerst het actieve waterstof van de thiolgroep vangen, wat resulteert in een anionische lading op het zwavelatoom.<\/p>\n

 <\/p>\n

Nucleofiele additiereactie:<\/p>\n

Het negatief geladen zwavelatoom reageert met het alfakoolstofatoom op de epoxyhars in een proces dat een nucleofiele additiereactie wordt genoemd.<\/p>\n

Deze reactie resulteert in het openen van de ternaire epoxygroep van de epoxyhars om twee hydroxylgroepen te vormen.<\/p>\n

 <\/p>\n

Thiol-zuurstofverbindingen worden gevormd:<\/p>\n

Het zwavelatoom in de thiolgroep reageert met het zuurstofatoom in de epoxygroep in een nucleofiele additiereactie om een zwavel-zuurstofverbinding te vormen, wat een belangrijke stap is in het uithardingsproces.<\/p>\n

 <\/p>\n

Vorming van de crosslink structuur:<\/p>\n

De twee gevormde hydroxylgroepen in de epoxyhars reageren verder met de mercaptangroepen in het polythiol om een vernette structuur te vormen.<\/p>\n

Deze vernettingsstructuur bindt het polythiol aan de epoxyhars.<\/p>\n

 <\/p>\n

Uithardingsresultaten:<\/p>\n

Door de bovenstaande reactie worden het polythiol en de epoxyhars gecombineerd tot een vast materiaal dat bestand is tegen slijtage, corrosie en hoge temperaturen.<\/p>\n

 <\/p>\n

Reactiekenmerken:<\/p>\n

De uithardingstijd van polysulfide-uithardende epoxy ligt over het algemeen tussen een paar minuten en een paar uur en vereist geen behandeling bij hoge temperatuur of hoge druk, waardoor het veel gebruikt wordt in industri\u00eble productie.<\/p>\n

Het uitgeharde materiaal heeft uitstekende fysische en chemische eigenschappen, zoals slijtvastheid, corrosiebestendigheid, goede isolatie en andere kenmerken.<\/p>\n

Samengevat is het reactiemechanisme van epoxyhars en polythiol een complex maar zeer effici\u00ebnt proces, dat de hechting en uitharding van de twee materialen realiseert door nucleofiele additiereactie en de vorming van vernette structuur.<\/p>\n

Control points in an epoxy\u2013polythiol formulation<\/h2>\n

Start from functional-group equivalents rather than simple weight percentages. The thiol equivalent weight, epoxy equivalent weight and functionality distribution determine the theoretical ratio; fillers, pigments and other reactive ingredients must be included in the calculation where applicable.<\/p>\n

Catalyst type and level strongly affect latency, pot life and cure speed. Mixing temperature, batch size and insulation can also change the exotherm, so a small laboratory cup result should not be transferred directly to a large mass. Record temperature versus time and check whether viscosity rise limits application before the nominal gel point.<\/p>\n

Validate cure with more than surface touch. Depending on the use, useful checks include conversion or residual functionality, hardness development, adhesion, tensile or lap-shear performance, chemical resistance, glass-transition behavior and aging. Moisture, amines, acidic contaminants and storage history can alter the result, so raw-material controls and a defined mixing sequence are part of the cure design.<\/p>\n

Use a documented polythiol as the formulation reference<\/h2>\n

De huidige CHLUMICRYL\u00ae Polythiol PM839<\/a> page provides a relevant polythiol reference. Request current equivalent-weight and handling data, then set the epoxy-to-thiol balance and catalyst level from controlled cure, pot-life and final-property trials.<\/p>\n

Neem nu contact met ons op!<\/b><\/strong><\/h2>\n

Als je Price nodig hebt, vul dan je contactgegevens in op het formulier hieronder. We nemen dan meestal binnen 24 uur contact met je op. Je kunt me ook een e-mail sturen info@longchangchemical.com<\/a><\/span> tijdens kantooruren (8:30 tot 18:00 UTC+8 ma. ~ za.) of gebruik de live chat op de website voor een snel antwoord.<\/b><\/strong><\/h4>\n

 <\/p>\n

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The reaction mechanism between epoxy resins and polythiols mainly involves the interaction between the thiol group and the epoxy group. The following is the detailed reaction mechanism: Reaction initiation: During<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143],"tags":[],"class_list":["post-7479","post","type-post","status-publish","format-standard","hentry","category-uv-light-curing-series"],"yoast_head":"\nEpoxy\u2013Polythiol Cure: Reaction Mechanism & Formulation<\/title>\n<meta name=\"description\" content=\"Understand epoxy\u2013polythiol addition and the effects of catalyst, equivalent ratio, temperature, moisture, pot life, exotherm and final network testing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangchemical.com\/nl\/reaction-mechanism-of-epoxy-resin-and-polythiol-monomer\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta 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