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

Risposta rapida:<\/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

Meccanismo di reazione della resina epossidica e del monomero politioide?<\/p>\n

Il meccanismo di reazione tra resine epossidiche e politiooli coinvolge principalmente l'interazione tra il gruppo tiolico e il gruppo epossidico. Di seguito \u00e8 riportato il meccanismo di reazione dettagliato:
\nInizio della reazione:<\/p>\n

Durante la reazione tra politioli e resine epossidiche, la coppia di elettroni non condivisa sull'ammina terziaria cattura prima l'idrogeno attivo del gruppo tiolico, dando luogo a una carica anionica sull'atomo di zolfo.<\/p>\n

 <\/p>\n

Reazione di addizione nucleofila:<\/p>\n

L'atomo di zolfo con carica negativa reagisce con l'atomo di carbonio alfa della resina epossidica in un processo chiamato reazione di addizione nucleofila.<\/p>\n

Questa reazione determina l'apertura del gruppo epossidico ternario della resina epossidica per formare due gruppi ossidrilici.<\/p>\n

 <\/p>\n

Si formano legami tiolo-ossigeno:<\/p>\n

L'atomo di zolfo del gruppo tiolico reagisce con l'atomo di ossigeno del gruppo epossidico in una reazione di addizione nucleofila per formare un legame zolfo-ossigeno, che \u00e8 una fase chiave del processo di polimerizzazione.<\/p>\n

 <\/p>\n

Formazione della struttura reticolare:<\/p>\n

I due gruppi ossidrilici formati nella resina epossidica reagiscono ulteriormente con i gruppi mercaptani contenuti nel politiolo per formare una struttura reticolata.<\/p>\n

Questa struttura di reticolazione lega il politolo alla resina epossidica.<\/p>\n

 <\/p>\n

Risultati della polimerizzazione:<\/p>\n

Attraverso la reazione di cui sopra, il politolo e la resina epossidica si combinano per formare un materiale solido resistente all'abrasione, alla corrosione e alle alte temperature.<\/p>\n

 <\/p>\n

Caratteristiche della reazione:<\/p>\n

Il tempo di polimerizzazione dell'epossidico polisolfurico \u00e8 generalmente compreso tra pochi minuti e qualche ora e non richiede trattamenti ad alta temperatura o ad alta pressione, il che lo rende ampiamente utilizzato nella produzione industriale.<\/p>\n

Il materiale polimerizzato presenta eccellenti propriet\u00e0 fisiche e chimiche, come resistenza all'abrasione, alla corrosione, buon isolamento e altre caratteristiche.<\/p>\n

In sintesi, il meccanismo di reazione tra resina epossidica e politolo \u00e8 un processo complesso ma altamente efficiente, che realizza lo stretto legame e la polimerizzazione dei due materiali attraverso la reazione di addizione nucleofila e la formazione di una struttura reticolata.<\/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

The current 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

Contattateci ora!<\/b><\/strong><\/h2>\n

Se avete bisogno di Price, inserite i vostri dati di contatto nel modulo sottostante; di solito vi contatteremo entro 24 ore. Potete anche inviarmi un'e-mail info@longchangchemical.com<\/a><\/span> durante l'orario di lavoro (dalle 8:30 alle 18:00 UTC+8 lun.-sab.) o utilizzare la live chat del sito web per ottenere una risposta immediata.<\/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\/it\/reaction-mechanism-of-epoxy-resin-and-polythiol-monomer\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta 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