{"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\/fr\/reaction-mechanism-of-epoxy-resin-and-polythiol-monomer\/","title":{"rendered":"Epoxy\u2013Polythiol Cure: Reaction Mechanism & Formulation"},"content":{"rendered":"

R\u00e9ponse rapide :<\/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

M\u00e9canisme de r\u00e9action de la r\u00e9sine \u00e9poxy et du monom\u00e8re polythiol ?<\/p>\n

Le m\u00e9canisme de r\u00e9action entre les r\u00e9sines \u00e9poxy et les polythiols implique principalement l'interaction entre le groupe thiol et le groupe \u00e9poxy. Le m\u00e9canisme de r\u00e9action est d\u00e9taill\u00e9 ci-dessous :
\nInitiation de la r\u00e9action :<\/p>\n

Lors de la r\u00e9action entre les polythiols et les r\u00e9sines \u00e9poxy, la paire d'\u00e9lectrons non partag\u00e9e sur l'amine tertiaire capture d'abord l'hydrog\u00e8ne actif du groupe thiol, ce qui entra\u00eene une charge anionique sur l'atome de soufre.<\/p>\n

 <\/p>\n

R\u00e9action d'addition nucl\u00e9ophile :<\/p>\n

L'atome de soufre charg\u00e9 n\u00e9gativement r\u00e9agit avec l'atome de carbone alpha de la r\u00e9sine \u00e9poxy dans un processus appel\u00e9 r\u00e9action d'addition nucl\u00e9ophile.<\/p>\n

Cette r\u00e9action entra\u00eene l'ouverture du groupe \u00e9poxy ternaire de la r\u00e9sine \u00e9poxy pour former deux groupes hydroxyles.<\/p>\n

 <\/p>\n

Des liaisons thiol-oxyg\u00e8ne sont form\u00e9es :<\/p>\n

L'atome de soufre du groupe thiol r\u00e9agit avec l'atome d'oxyg\u00e8ne du groupe \u00e9poxy dans une r\u00e9action d'addition nucl\u00e9ophile pour former une liaison soufre-oxyg\u00e8ne, qui est une \u00e9tape cl\u00e9 du processus de durcissement.<\/p>\n

 <\/p>\n

Formation d'une structure r\u00e9ticul\u00e9e :<\/p>\n

Les deux groupes hydroxyle form\u00e9s dans la r\u00e9sine \u00e9poxy r\u00e9agissent ensuite avec les groupes mercaptan contenus dans le polythiol pour former une structure r\u00e9ticul\u00e9e.<\/p>\n

Cette structure de r\u00e9ticulation lie le polythiol \u00e0 la r\u00e9sine \u00e9poxy.<\/p>\n

 <\/p>\n

R\u00e9sultats de la polym\u00e9risation :<\/p>\n

Par la r\u00e9action ci-dessus, le polythiol et la r\u00e9sine \u00e9poxy sont combin\u00e9s pour former un mat\u00e9riau solide r\u00e9sistant \u00e0 l'abrasion, \u00e0 la corrosion et aux temp\u00e9ratures \u00e9lev\u00e9es.<\/p>\n

 <\/p>\n

Caract\u00e9ristiques de la r\u00e9action :<\/p>\n

Le temps de durcissement de l'\u00e9poxy polym\u00e9ris\u00e9 au polysulfure est g\u00e9n\u00e9ralement compris entre quelques minutes et quelques heures, et ne n\u00e9cessite pas de traitement \u00e0 haute temp\u00e9rature ou \u00e0 haute pression, ce qui en fait un produit largement utilis\u00e9 dans la production industrielle.<\/p>\n

Le mat\u00e9riau durci pr\u00e9sente d'excellentes propri\u00e9t\u00e9s physiques et chimiques, telles que la r\u00e9sistance \u00e0 l'abrasion, la r\u00e9sistance \u00e0 la corrosion, une bonne isolation et d'autres caract\u00e9ristiques.<\/p>\n

En r\u00e9sum\u00e9, le m\u00e9canisme de r\u00e9action entre la r\u00e9sine \u00e9poxy et le polythiol est un processus complexe mais tr\u00e8s efficace, qui r\u00e9alise la liaison \u00e9troite et le durcissement des deux mat\u00e9riaux par une r\u00e9action d'addition nucl\u00e9ophile et la formation d'une structure r\u00e9ticul\u00e9e.<\/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

Le courant 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

Contactez-nous d\u00e8s maintenant !<\/b><\/strong><\/h2>\n

Si vous avez besoin de Price, veuillez indiquer vos coordonn\u00e9es dans le formulaire ci-dessous. Nous vous contacterons g\u00e9n\u00e9ralement dans les 24 heures. Vous pouvez \u00e9galement m'envoyer un courriel info@longchangchemical.com<\/a><\/span> pendant les heures de travail ( 8:30 am to 6:00 pm UTC+8 Mon.~Sat. ) ou utilisez le chat en direct du site web pour obtenir une r\u00e9ponse rapide.<\/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\/fr\/reaction-mechanism-of-epoxy-resin-and-polythiol-monomer\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta 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