{"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\/nl\/what-is-a-photoinitiator\/","title":{"rendered":"Wat is een fotoinitiator?"},"content":{"rendered":"<h1><strong>What is a photoinitiator<\/strong><strong>\uff1f<\/strong><\/h1>\n<p>photoinitiator, also known as (photosensitizer) or (photocuring agent),<\/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\" \/>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. They play a key role in photocuring systems and are widely used in UV adhesives, UV coatings, UV inks, and gel polishes.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><b>01 Principle of Action<\/b><\/strong><\/p>\n<p>After absorbing light energy, photoinitiator molecules transition from the ground state to an excited state, undergoing chemical changes via singlet or triplet states to generate active fragments (such as free radicals and cations) that can initiate polymerization. Based on their mechanism, they can be categorized as follows:<\/p>\n<p><strong><b>&#8211; Free radical photoinitiators: <\/b><\/strong>These generate free radicals through cleavage or hydrogen abstraction reactions, initiating free radical polymerization.<\/p>\n<p><strong><b>&#8211; Cationic photoinitiators: <\/b><\/strong>After photolysis, they generate a strong proton acid (such as a Br\u00f8nsted acid), initiating cationic polymerization.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><b>02 Classification &amp; Typical Representatives<\/b><\/strong><\/p>\n<p>Free Radical Photoinitiators:<\/p>\n<p><strong><b>(1) Cleavage-Type Initiators<\/b><\/strong><\/p>\n<p>After absorbing light energy, a Norrish I reaction occurs, and the bond breaks to generate free radicals:<\/p>\n<ul>\n<li><strong><b> 1173 (HMPP): <\/b><\/strong>2-Hydroxy-2-methyl-1-phenylpropanone<\/li>\n<li><strong><b> 184 (HCPK): <\/b><\/strong>1-Hydroxycyclohexylphenyl ketone<\/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-Methyl-2-(4-morpholinyl)-1-[4-(methylthio)phenyl]-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-trimethylbenzoyl-diphenylphosphine oxide<\/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>Ethyl 2,4,6-trimethylbenzoylphenylphosphonate<\/p>\n<p><strong><b>659: <\/b><\/strong>2-Hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone<\/p>\n<p>MBF: Methyl benzoylformate<\/p>\n<p><strong><b>(2) Hydrogen abstraction initiators<\/b><\/strong><\/p>\n<p>Generate free radicals through hydrogen abstraction reaction:<\/p>\n<ul>\n<li><strong><b> BP: <\/b><\/strong><a href=\"https:\/\/changhongchemical.com\/product\/photoinitiator-bp-cas-119-61-9\/\">Benzophenone<\/a><\/li>\n<li><strong><b> MBP: <\/b><\/strong>4-methylbenzophenone<\/li>\n<\/ul>\n<p><strong><b>(3) Composite initiator<\/b><\/strong><\/p>\n<ul>\n<li><b><\/b><strong><b>IHT-PI 910: <\/b><\/strong><\/li>\n<\/ul>\n<p>2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl]-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>Cationic photoinitiators:<\/b><\/strong><\/p>\n<p>Photolysis generates a superacid that initiates polymerization of epoxies, vinyl ethers, and other materials:<\/p>\n<ul>\n<li>Ionium salts (e.g., I-250)<\/li>\n<li>Sulfonium salts (e.g., I-160)<\/li>\n<li>Metallocene salts (e.g., cumene ferrocenium hexafluorophosphate)<\/li>\n<li>Organosilanes<\/li>\n<\/ul>\n<p><strong><b>03 Structural Classification Summary<\/b><\/strong><\/p>\n<p>Free Radical Photoinitiators:<\/p>\n<p>&#8211; Benzoin and Derivatives (Benzoin Ethers)<\/p>\n<p>&#8211; Benzyls (Benzoyl Benzophenones)<\/p>\n<p>&#8211; Alkyl Phenones (\u03b1-Hydroxyalkyl Phenones, \u03b1-Aminoalkyl Phenones)<\/p>\n<p>&#8211; Acyl Phosphine Oxides (TPO, etc.)<\/p>\n<p>&#8211; Benzophenones<\/p>\n<p>&#8211; Thioxanthones<\/p>\n<p>Cationic Photoinitiators:<\/p>\n<p>&#8211; Onium Salts (Ionium Salts, Sulfonium Salts)<\/p>\n<p>&#8211; Metalloorganics (Ferrocenium Salts)<\/p>\n<p>&#8211; Organosilanes<\/p>\n<p><strong><b>04 Application Areas<\/b><\/strong><\/p>\n<p>Photoinitiators are core components of radiation curing technology and are widely used in:<\/p>\n<p>UV coatings: wood, plastic, and metal coatings<\/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\" \/>UV inks:<\/b><\/strong>\u00a0Printing and packaging industries<\/p>\n<p><strong><b>UV adhesives:<\/b><\/strong>\u00a0Electronics and medical adhesives<\/p>\n<p><strong><b>Gel polish:<\/b><\/strong>\u00a0UV\/LED-curable\u00a0gel polish (such as CHROM\u00c9CLAIR&#8217;s <a href=\"https:\/\/chromeclair.com\/\">HEMA-free Gel Polish<\/a>) for the nail art industry, offering fast curing, high gloss, and abrasion resistance<\/p>\n<p><strong><b>Other light-curing materials: <\/b><\/strong>3D printing, photoresists, etc.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><b>05 Features and Advantages<\/b><\/strong><\/p>\n<p>Light-curing technology meets the &#8220;5E&#8221; green standards:<\/p>\n<ul>\n<li><strong><b> Efficient:<\/b><\/strong>Cures in seconds<\/li>\n<li><strong><b> Enabling:<\/b><\/strong>Applicable to a variety of substrates<\/li>\n<li><strong><b> Economical: <\/b><\/strong>Low energy consumption and high production efficiency<\/li>\n<li><strong><b> Energy-saving: <\/b><\/strong>Room-temperature reaction, no heating required<\/li>\n<li><strong><b> Environmentally Friendly: <\/b><\/strong>No VOC emissions, low pollution<\/li>\n<\/ul>\n","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 v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is a photoinitiator\uff1f<\/title>\n<meta name=\"description\" content=\"photoinitiator, also 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Ze spelen een belangrijke rol in fotocureersystemen en worden veel gebruikt in UV-lijmen, UV-coatings, UV-inkten en gelpolish.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/changhongchemical.com\/nl\/what-is-a-photoinitiator\/","og_locale":"nl_NL","og_type":"article","og_title":"What is a photoinitiator\uff1f","og_description":"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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