{"id":8837,"date":"2025-09-05T10:08:44","date_gmt":"2025-09-05T10:08:44","guid":{"rendered":"https:\/\/changhongchemical.com\/?p=8837"},"modified":"2026-04-27T11:16:00","modified_gmt":"2026-04-27T11:16:00","slug":"what-is-a-photoinitiator","status":"publish","type":"post","link":"https:\/\/changhongchemical.com\/it\/what-is-a-photoinitiator\/","title":{"rendered":"Che cos'\u00e8 un fotoiniziatore?"},"content":{"rendered":"<h1><strong>Cos'\u00e8 un fotoiniziatore<\/strong><strong>\uff1f<\/strong><\/h1>\n<p>fotoiniziatore, noto anche come (fotosensibilizzante) o (agente fotopolimerizzante),<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-8841\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1.webp\" alt=\"\" width=\"3462\" height=\"2084\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1.webp 3462w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-768x462.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1536x925.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-2048x1233.webp 2048w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-18x12.webp 18w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-1196x720.webp 1196w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/1-600x361.webp 600w\" sizes=\"(max-width: 3462px) 100vw, 3462px\" \/>Questi composti assorbono specifiche lunghezze d'onda di energia luminosa nelle regioni dell'ultravioletto (250-420 nm) o del visibile (400-800 nm), generando specie reattive come radicali liberi o cationi, che avviano la polimerizzazione, la reticolazione e l'indurimento. Svolgono un ruolo fondamentale nei sistemi di fotopolimerizzazione e sono ampiamente utilizzati negli adesivi UV, nei rivestimenti UV, negli inchiostri UV e nei lucidanti in gel.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><b>01 Principio d'azione<\/b><\/strong><\/p>\n<p>Dopo aver assorbito l'energia luminosa, le molecole dei fotoiniziatori passano dallo stato fondamentale a uno stato eccitato, subendo cambiamenti chimici attraverso stati singoletto o tripletto per generare frammenti attivi (come radicali liberi e cationi) che possono avviare la polimerizzazione. In base al loro meccanismo, possono essere classificati come segue:<\/p>\n<p><strong><b>- Fotoiniziatori di radicali liberi: <\/b><\/strong>Questi generano radicali liberi attraverso reazioni di scissione o di sottrazione di idrogeno, dando inizio alla polimerizzazione a radicali liberi.<\/p>\n<p><strong><b>- Fotoiniziatori cationici: <\/b><\/strong>Dopo la fotolisi, generano un forte protone acido (come un acido di Br\u00f8nsted), dando inizio alla polimerizzazione cationica.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><b>02 Classificazione e rappresentanti tipici<\/b><\/strong><\/p>\n<p>Fotocatalizzatori di radicali liberi:<\/p>\n<p><strong><b>(1) Iniziatori di tipo Cleavage<\/b><\/strong><\/p>\n<p>Dopo aver assorbito l'energia luminosa, si verifica una reazione di Norrish I e il legame si rompe generando radicali liberi:<\/p>\n<ul>\n<li><strong><b> 1173 (HMPP): <\/b><\/strong>2-Idrossi-2-metil-1-fenilpropanone<\/li>\n<li><strong><b> 184 (HCPK): <\/b><\/strong>1-Idrossi-cicloesilfenil chetone<\/li>\n<\/ul>\n<p><strong><b><img decoding=\"async\" class=\"alignnone size-full wp-image-8838\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/184-1173.webp\" alt=\"\" width=\"3462\" height=\"2084\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/184-1173.webp 3462w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/184-1173-768x462.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/184-1173-1536x925.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/184-1173-2048x1233.webp 2048w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/184-1173-18x12.webp 18w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/184-1173-1196x720.webp 1196w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/184-1173-600x361.webp 600w\" sizes=\"(max-width: 3462px) 100vw, 3462px\" \/>907: <\/b><\/strong>2-Metil-2-(4-morfolinil)-1-[4-(metiltio)fenil]-1-propanone<\/p>\n<p><strong><b><img decoding=\"async\" class=\"alignnone size-full wp-image-8839\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/937.webp\" alt=\"\" width=\"3462\" height=\"2084\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/937.webp 3462w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/937-768x462.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/937-1536x925.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/937-2048x1233.webp 2048w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/937-18x12.webp 18w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/937-1196x720.webp 1196w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/937-600x361.webp 600w\" sizes=\"(max-width: 3462px) 100vw, 3462px\" \/>TPO: <\/b><\/strong>2,4,6-trimetilbenzoil-difenilfosfina ossido<\/p>\n<p><strong><b><img decoding=\"async\" class=\"alignnone size-full wp-image-8840\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/tpo.webp\" alt=\"\" width=\"3462\" height=\"2084\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/tpo.webp 3462w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/tpo-768x462.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/tpo-1536x925.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/tpo-2048x1233.webp 2048w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/tpo-18x12.webp 18w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/tpo-1196x720.webp 1196w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/tpo-600x361.webp 600w\" sizes=\"(max-width: 3462px) 100vw, 3462px\" \/><a href=\"https:\/\/changhongchemical.com\/product\/photoinitiator-tpo-l-cas-84434-11-7\/\">TPO-L<\/a>: <\/b><\/strong>2,4,6-trimetilbenzoilfenilfosfonato di etile<\/p>\n<p><strong><b>659: <\/b><\/strong>2-Idrossi-2-metil-1-[4-(2-idrossietossi)fenile]-1-propanone<\/p>\n<p>MBF: Metile benzoilformato<\/p>\n<p><strong><b>(2) Iniziatori di astrazione dell'idrogeno<\/b><\/strong><\/p>\n<p>Generano radicali liberi attraverso la reazione di astrazione dell'idrogeno:<\/p>\n<ul>\n<li><strong><b> BP: <\/b><\/strong><a href=\"https:\/\/changhongchemical.com\/product\/photoinitiator-bp-cas-119-61-9\/\">Benzofenone<\/a><\/li>\n<li><strong><b> MBP: <\/b><\/strong>4-metilbenzofenone<\/li>\n<\/ul>\n<p><strong><b>(3) Iniziatore composito<\/b><\/strong><\/p>\n<ul>\n<li><b><\/b><strong><b>IHT-PI 910: <\/b><\/strong><\/li>\n<\/ul>\n<p>2-dimetilammino-2-benzil-1-[4-(4-morfolinil)fenil]-1-butanone<\/p>\n<ul>\n<li><strong><b> IHT-PI 4265:<\/b><\/strong>50% TPO + 50% 1173<\/li>\n<li><strong><b> IHT-PI 1000:<\/b><\/strong>20% 184 + 80% 1173<\/li>\n<li><strong><b>IHT-PI 500:<\/b><\/strong>50% 184 + 50% BP<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong><b>Fotoiniziatori cationici:<\/b><\/strong><\/p>\n<p>La fotolisi genera un superacido che avvia la polimerizzazione di epossidici, eteri di vinile e altri materiali:<\/p>\n<ul>\n<li>Sali di ionio (ad es. I-250)<\/li>\n<li>Sali di solfonio (ad es. I-160)<\/li>\n<li>Sali di metallocene (ad esempio, esafluorofosfato di cumene ferrocenio)<\/li>\n<li>Organosilani<\/li>\n<\/ul>\n<p><strong><b>03 Sintesi della classificazione strutturale<\/b><\/strong><\/p>\n<p>Fotocatalizzatori di radicali liberi:<\/p>\n<p>- Benzoino e derivati (eteri di benzoino)<\/p>\n<p>- Benzili (benzoilbenzofenoni)<\/p>\n<p>- Fenoni alchilici (\u03b1-idrossi-fenoni alchilici, \u03b1-amino-fenoni alchilici)<\/p>\n<p>- Ossidi acilici di fosfina (TPO, ecc.)<\/p>\n<p>- Benzofenoni<\/p>\n<p>- Tioxantoni<\/p>\n<p>Fotocatalizzatori cationici:<\/p>\n<p>- Sali di onio (sali di ionio, sali di solfonio)<\/p>\n<p>- Metalloorganici (sali di ferrocenio)<\/p>\n<p>- Organosilani<\/p>\n<p><strong><b>04 Aree di applicazione<\/b><\/strong><\/p>\n<p>I fotoiniziatori sono componenti fondamentali della tecnologia di polimerizzazione a radiazione e sono ampiamente utilizzati in:<\/p>\n<p>Rivestimenti UV: rivestimenti per legno, plastica e metallo<\/p>\n<p><strong><b><img decoding=\"async\" class=\"alignnone size-full wp-image-8842\" src=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2.webp\" alt=\"\" width=\"3462\" height=\"2084\" srcset=\"https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2.webp 3462w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-768x462.webp 768w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-1536x925.webp 1536w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-2048x1233.webp 2048w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-18x12.webp 18w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-1196x720.webp 1196w, https:\/\/changhongchemical.com\/wp-content\/uploads\/2025\/09\/2-600x361.webp 600w\" sizes=\"(max-width: 3462px) 100vw, 3462px\" \/>Inchiostri UV:<\/b><\/strong>\u00a0Industrie della stampa e dell'imballaggio<\/p>\n<p><strong><b>Adesivi UV:<\/b><\/strong>\u00a0Adesivi per l'elettronica e il settore medicale<\/p>\n<p><strong><b>Smalto gel:<\/b><\/strong>\u00a0Smalto gel polimerizzabile UV\/LED (come CHROM\u00c9CLAIR <a href=\"https:\/\/chromeclair.com\/\">Smalto gel senza HEMA<\/a>) per l'industria della nail art, che offre una rapida polimerizzazione, elevata brillantezza e resistenza all'abrasione.<\/p>\n<p><strong><b>Altri materiali fotopolimerizzabili: <\/b><\/strong>Stampa 3D, fotoresistenze, ecc.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><b>05 Caratteristiche e vantaggi<\/b><\/strong><\/p>\n<p>La tecnologia di fotopolimerizzazione soddisfa gli standard verdi \"5E\":<\/p>\n<ul>\n<li><strong><b> Efficiente:<\/b><\/strong>Cura in pochi secondi<\/li>\n<li><strong><b> Abilitazione:<\/b><\/strong>Applicabile a una variet\u00e0 di substrati<\/li>\n<li><strong><b> Economico: <\/b><\/strong>Basso consumo energetico ed elevata efficienza produttiva<\/li>\n<li><strong><b> Risparmio energetico: <\/b><\/strong>Reazione a temperatura ambiente, senza riscaldamento<\/li>\n<li><strong><b> Rispettoso dell'ambiente: <\/b><\/strong>Nessuna emissione di VOC, basso inquinamento<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>photoinitiator, also known as (photosensitizer) or (photocuring agent), These compounds absorb specific wavelengths of light energy in the ultraviolet (250-420 nm) or visible (400-800 nm) regions, generating reactive species such as free radicals or&#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8837","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is a photoinitiator\uff1f<\/title>\n<meta name=\"description\" content=\"photoinitiator, also known as (photosensitizer) or (photocuring agent),These compounds absorb specific wavelengths of light energy in the ultraviolet (250-420 nm) or visible (400-800 nm) regions, generating reactive species such as free radicals or cations, which then initiate polymerization, crosslinking, and curing. 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