{"id":5435,"date":"2022-08-05T13:30:37","date_gmt":"2022-08-05T13:30:37","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5435"},"modified":"2026-04-28T10:42:05","modified_gmt":"2026-04-28T10:42:05","slug":"structure-principle-of-action-and-common-types-of-hals","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/tr\/structure-principle-of-action-and-common-types-of-hals\/","title":{"rendered":"Engellenmi\u015f amin \u0131\u015f\u0131k stabilizat\u00f6rlerinin (HALS) yap\u0131s\u0131, etki prensibi ve yayg\u0131n t\u00fcrleri"},"content":{"rendered":"<h1><strong>Engellenmi\u015f amin \u0131\u015f\u0131k stabilizat\u00f6rlerinin (HALS) yap\u0131s\u0131, etki prensibi ve yayg\u0131n t\u00fcrleri<\/strong><\/h1>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>H\u0131zl\u0131 cevap:<\/strong> Antioksidan, UV emici ve HALS konular\u0131nda, form\u00fclasyon uzmanlar\u0131 genellikle uzun vadeli koruma, proses stabilitesi ve renk kontrol\u00fcn\u00fc birlikte kar\u015f\u0131la\u015ft\u0131r\u0131rlar \u00e7\u00fcnk\u00fc bu \u00f6ncelikler her zaman ayn\u0131 katk\u0131 maddesine i\u015faret etmeyebilir.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>In practical weatherability packages, a common combination is <a href=\"https:\/\/longchangchemical.com\/tr\/product\/uv-384-2\/\">UV Emici 384-2<\/a> together with <a href=\"https:\/\/longchangchemical.com\/tr\/product\/light-stabilizer-292\/\">I\u015f\u0131k Sabitleyici 292<\/a> to balance UV screening and radical scavenging.<\/p>\n<p>Serbest radikal tutucu maddelerin i\u015flevi, esas olarak alkil radikalleri, alkoksi radikalleri, peroksi radikalleri vb. dahil olmak \u00fczere kaplamalar\u0131n foto\u011fraflanmas\u0131 s\u0131ras\u0131nda olu\u015fan serbest radikalleri yakalamak ve bu reaktif gruplar\u0131n organik polimerler \u00fczerindeki daha fazla oksidatif hasar\u0131n\u0131 engellemektir. Serbest radikal tutucu maddeler aras\u0131nda engellenmi\u015f fenol \u0131\u015f\u0131k stabilizat\u00f6rleri ve engellenmi\u015f amin \u0131\u015f\u0131k stabilizat\u00f6rleri (HALS) olmak \u00fczere iki kategori bulunmaktad\u0131r. \u0130lki fenolik bir yap\u0131d\u0131r, serbest radikal polimerizasyonu \u00fczerinde engelleyici bir etkiye sahip olabilir, \u0131\u015f\u0131k stabilizasyon etkisi genellikle engellenmi\u015f amin \u0131\u015f\u0131k stabilizat\u00f6r\u00fc kadar iyi de\u011fildir ve bir antioksidan olarak kullan\u0131m\u0131 daha yayg\u0131nd\u0131r. Engellenmi\u015f amin \u0131\u015f\u0131k stabilizat\u00f6r\u00fc, y\u00fcksek verimli bir \u0131\u015f\u0131k stabilizat\u00f6r\u00fc s\u0131n\u0131f\u0131d\u0131r, \u015fu anda polimer malzemelerin anti-\u0131\u015f\u0131k ya\u015flanma s\u00fcrecinde en yayg\u0131n kullan\u0131lan \u0131\u015f\u0131k stabilizat\u00f6rlerinden biridir, genellikle polimer foto-oksidasyonunun yakalanmas\u0131, radikallerin bozunma s\u00fcreci ve alkil hidrojen peroksitin ayr\u0131\u015fmas\u0131 yoluyla polimer \u0131\u015f\u0131k stabilizasyonunun \u00e7ok \u00f6nemli bir tan\u0131t\u0131m\u0131na sahiptir. polimerlerin \u0131\u015f\u0131k stabilizasyonu amac\u0131na ula\u015fmak i\u00e7in uyar\u0131lm\u0131\u015f durum enerjisini ve di\u011fer yollar\u0131 patlat\u0131r, ancak ayn\u0131 zamanda mevcut \u0131\u015f\u0131kla sertle\u015fen kaplamalarda yayg\u0131n ve verimli bir \u0131\u015f\u0131k stabilizat\u00f6r\u00fcd\u00fcr.<\/p>\n<p>&nbsp;<\/p>\n<p>Yap\u0131sal olarak, engellenmi\u015f aminler, piperidin serisi, imidazolidinon serisi, azetidinon serisi ve di\u011fer t\u00fcrevleri i\u00e7erir; bunlar aras\u0131nda 2,2,6,6-tetrametilpiperidin ve ikame edilmi\u015f t\u00fcrevleri serisi bask\u0131nd\u0131r ve temel yap\u0131lar soldaki \u015fekilde (a) ve (b) g\u00f6sterilmi\u015ftir.<\/p>\n<p>&nbsp;<\/p>\n<p>HALS'in \u00e7e\u015fitli yap\u0131lar\u0131 aras\u0131nda N-H yap\u0131s\u0131 ve N-metil s\u00fcbstit\u00fce t\u00fcrevleri yayg\u0131nd\u0131r ve N asetil t\u00fcrevleri d\u00fc\u015f\u00fck performansa sahiptir. Tetrametilpiperidin yap\u0131s\u0131 konjuge yap\u0131ya ve kromojenik gruba sahip de\u011fildir, 250 nm'den daha y\u00fcksek dalga boyuna sahip herhangi bir \u0131\u015f\u0131\u011f\u0131 absorbe etmez ve ultraviyole absorbe edici ve uyar\u0131lm\u0131\u015f durum patlama ajan\u0131 \u00f6zelliklerine sahip de\u011fildir. Fotostabilizasyon mekanizmas\u0131, soldaki \u015fekilde g\u00f6sterildi\u011fi gibi olduk\u00e7a karma\u015f\u0131kt\u0131r. Genel olarak, sol \u00fcstteki (c)'de g\u00f6sterildi\u011fi gibi, polimerlerin fotostabilizasyonunda ger\u00e7ekten do\u011frudan rol oynayan\u0131n engellenmi\u015f amin nitrojen-oksijen radikalleri oldu\u011funa inan\u0131lmaktad\u0131r. HALS, aktif fotostabil yap\u0131n\u0131n yaln\u0131zca bir \u00f6nc\u00fcs\u00fcd\u00fcr ve fotooksidasyon ko\u015fullar\u0131 alt\u0131nda, ozon, uyar\u0131lm\u0131\u015f singlet hal oksijen molek\u00fclleri hidrojen peroksit, peroksil radikalleri ve alkil hidrojen peroksit gibi oksitleyici t\u00fcrler mutlaka polimerde bulunur veya \u00fcretilir. tetrametilpiperidin yap\u0131s\u0131, sol \u00fcstte (a) ve (b)'de g\u00f6sterildi\u011fi gibi, bu reaktif t\u00fcrler taraf\u0131ndan sol \u00fcstte (c)'de g\u00f6sterildi\u011fi gibi azot-oksijen radikal yap\u0131s\u0131na oksidasyona duyarl\u0131d\u0131r. Nitroksit radikal yap\u0131s\u0131, geleneksel ko\u015fullar alt\u0131nda izole edilebilen ve safla\u015ft\u0131r\u0131labilen nispeten kararl\u0131 bir radikaldir.<\/p>\n<p>HALS azot-oksijen radikalleri foto-ya\u015flanma s\u0131ras\u0131nda olu\u015fan serbest radikalleri yakalayabilir ve bunlar\u0131n daha sonraki zararl\u0131 reaksiyonlar\u0131n\u0131 engelleyebilir. Etkinin \u015fematik diyagram\u0131 yukar\u0131da g\u00f6sterilmi\u015ftir.<\/p>\n<p>Fotoya\u015flanma ile \u00fcretilen zincir radikalleri, peroksil radikalleri olu\u015fturmak i\u00e7in k\u00fcrlenmi\u015f film i\u00e7indeki oksijen molek\u00fclleriyle de etkile\u015fime girebilir, yani nitrojen-oksijen radikalleri ve oksijen molek\u00fclleri zincir radikallerine ba\u011flanmak i\u00e7in rekabet eder ve oksijen molek\u00fclleri ile karbon merkezli radikaller aras\u0131ndaki ba\u011flanma reaksiyonu, h\u0131z sabiti taraf\u0131ndan biraz domine edilir. Neyse ki, kat\u0131 polimer filmlerde, \u00f6zellikle \u00e7apraz ba\u011fl\u0131 polimer kaplamalarda, oksijen molek\u00fcllerinin dif\u00fczyonu k\u0131s\u0131tl\u0131d\u0131r ve film i\u00e7indeki oksijen molek\u00fcllerinin konsantrasyonu azot oksijen radikallerinin konsantrasyonundan \u00e7ok daha d\u00fc\u015f\u00fckt\u00fcr. Bu nedenle, azot-oksijen radikalleri, zincir radikallerine kar\u015f\u0131 kapanma reaksiyonunda nispeten bask\u0131nd\u0131r. Nitroksil radikali ba\u015flang\u0131\u00e7ta sadece polimer zincir radikallerini yakalayarak NOR olarak g\u00f6sterilen engellenmi\u015f bir piperidin oksijen s\u0131zd\u0131rmaz polimer zincir segmenti olu\u015fturur ve bu da polimer sisteminde fotoya\u015flanma ile \u00fcretilen peroksit radikalleri ile etkile\u015fime girmeye devam edebilir, peroksit radikallerini t\u00fcketir ve ayn\u0131 zamanda aktif nitroksil radikallerini ve engellenmi\u015f amin yap\u0131lar\u0131n\u0131 yeniden \u00fcreterek HALS'in erdemli bir d\u00f6ng\u00fcs\u00fcn\u00fc olu\u015fturur. Bu muhtemelen HALS'\u0131n fotostabilize edici etkisini g\u00f6sterdi\u011fi ana mekanizmad\u0131r. Sol \u00fcstteki diyagramda g\u00f6sterildi\u011fi gibi.<\/p>\n<p>HALS, bir\u00e7ok dereceli engellenmi\u015f amin \u0131\u015f\u0131k stabilizat\u00f6r\u00fc geli\u015ftirmi\u015ftir, yayg\u0131n olarak kullan\u0131lan \u0131\u015f\u0131k stabilizat\u00f6rlerinin \u00e7e\u015fitlili\u011fi bask\u0131n bir konuma sahiptir, aminin \u00f6zelliklerinden dolay\u0131 HALS, belirli bir alkalin, asit protonasyonu g\u00f6sterir, nitrojen oksijen radikal aktivitesine d\u00f6n\u00fc\u015f\u00fcm azalacakt\u0131r. Bu nedenle, y\u00fcksek alkaliniteye sahip HALS asit veya asit katalizli kaplama form\u00fclasyonlar\u0131nda kullan\u0131lmamal\u0131d\u0131r ve benzer sorunlar halojen i\u00e7eren alev geciktirici kaplamalar i\u00e7in de mevcuttur. HALS'\u0131n yap\u0131s\u0131, asitli\u011fi ve alkalinitesi \u00fczerinde \u00f6nemli bir etkiye sahiptir ve yap\u0131 ile asitlik aras\u0131ndaki ili\u015fki a\u015fa\u011f\u0131daki tabloda g\u00f6sterilmi\u015ftir.<\/p>\n<p>&nbsp;<\/p>\n<p>N-alkillenmi\u015f engellenmi\u015f aminin (N-CH3) alkalinitesi, ikincil amin yap\u0131s\u0131na (N-H) sahip engellenmi\u015f amininkinden biraz daha zay\u0131ft\u0131r ve hidroksilamin yap\u0131s\u0131, O-alkillenmi\u015f hidroksilamin yap\u0131s\u0131 ve asetillenmi\u015f engellenmi\u015f amin hatt\u0131 organizmalar\u0131 bile bir miktar zay\u0131f asitlik sergiler. Engellenmi\u015f amin \u0131\u015f\u0131k stabilizat\u00f6rlerinin bazikli\u011fi azalt\u0131l\u0131rken, reaktiviteleri gibi fakt\u00f6rler de g\u00f6z \u00f6n\u00fcnde bulundurulmal\u0131d\u0131r. Uygulama a\u00e7\u0131s\u0131ndan bak\u0131ld\u0131\u011f\u0131nda, zay\u0131f alkali engellenmi\u015f amin \u0131\u015f\u0131k stabilizat\u00f6r\u00fc genellikle daha fazla O-alkillenmi\u015f hidroksilamin yap\u0131s\u0131 ve asetillenmi\u015f engellenmi\u015f amin t\u00fcrevleridir, bu HALS asidik ortam kaplama form\u00fclasyonlar\u0131 i\u00e7in uygundur.<\/p>\n<p>&nbsp;<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>Antioksidan, UV emici ve HALS paketleri i\u00e7in pratik bir se\u00e7im y\u00f6ntemi<\/h2>\n<p>Stabilizat\u00f6r kararlar\u0131n\u0131n \u00e7o\u011fu, tek bir \u00fcr\u00fcn karar\u0131 yerine paket karar\u0131 olarak ele al\u0131nd\u0131\u011f\u0131nda en iyi sonucu verir. Teknik al\u0131c\u0131lar genellikle uzun vadeli \u0131s\u0131 ya\u015flanmas\u0131, proses stabilitesi, hava ko\u015fullar\u0131na maruz kalma ve renk hassasiyetini birlikte inceleyerek en g\u00fc\u00e7l\u00fc cevab\u0131 al\u0131rlar.<\/p>\n<ul>\n<li><strong>\u0130\u015fleme korumas\u0131n\u0131 uzun vadeli istikrardan ay\u0131r\u0131n:<\/strong> Erime ge\u00e7mi\u015fi i\u00e7in en iyi katk\u0131 maddesi, her zaman en iyi kullan\u0131m \u00f6mr\u00fc korumas\u0131n\u0131 sa\u011flayan katk\u0131 maddesiyle ayn\u0131 de\u011fildir.<\/li>\n<li><strong>Sinerjiyi bilin\u00e7li olarak kullan\u0131n:<\/strong> Bir\u00e7ok polimer ve kaplama sistemi, birincil ve ikincil stabilizat\u00f6rler bilin\u00e7li olarak e\u015fle\u015ftirildi\u011finde en iyi performans\u0131 g\u00f6sterir.<\/li>\n<li><strong>Renk ve netlik gereksinimlerini g\u00f6zden ge\u00e7irin:<\/strong> \u015eeffaf, soluk, g\u0131da ile temas eden veya beyaz sistemler genellikle koyu renkli end\u00fcstriyel \u00fcr\u00fcnlere g\u00f6re daha s\u0131k\u0131 bir ambalaja ihtiya\u00e7 duyar.<\/li>\n<li><strong>Ger\u00e7ek ya\u015flanma durumunu kontrol edin:<\/strong> Is\u0131, UV \u0131\u015f\u0131nlar\u0131, nem ve d\u0131\u015f mekan maruziyeti, hangi stabilizat\u00f6r y\u00f6nteminin ticari olarak en g\u00fc\u00e7l\u00fc oldu\u011funu de\u011fi\u015ftirebilir.<\/li>\n<\/ul>\n<h3>\u00d6nerilen \u00fcr\u00fcn referanslar\u0131<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/tr\/product\/hema-monomer-cas-868-77-9\/\">CHLUMICRYL HEMA<\/a>:<\/strong> Yap\u0131\u015fma ve reaktivite odakl\u0131 sistemlerde iyi bilinen bir polar monomer referans\u0131.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumiao-1010-cas-6683-19-8\/\">CHLUM\u0130AO 1010<\/a>:<\/strong> Uzun vadeli termal stabilite i\u00e7in yayg\u0131n olarak kullan\u0131lan birincil antioksidan \u00f6l\u00e7\u00fct\u00fcd\u00fcr.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/tr\/product\/chlumiao-168-cas-31570-04-4\/\">CHLUM\u0130AO 168<\/a>:<\/strong> Hidroperoksit kontrol\u00fcn\u00fcn \u00f6nemli oldu\u011fu durumlarda pratik bir proses istikrar\u0131 referans\u0131.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/tr\/product\/light-stabilizer-123-tinuvin-123-cas-129757-67-1\/\">CHLUMILS UV-123<\/a>:<\/strong> Kaplamalar ve polimerlerde hava ko\u015fullar\u0131na dayan\u0131kl\u0131l\u0131\u011fa odakl\u0131 elekler i\u00e7in g\u00fc\u00e7l\u00fc bir HALS referans\u0131.<\/li>\n<\/ul>\n<h3>Al\u0131c\u0131lar ve form\u00fclat\u00f6rler i\u00e7in SSS<\/h3>\n<p><strong>Stabilizat\u00f6r paketleri neden genellikle tek bir katk\u0131 maddesinden daha g\u00fc\u00e7l\u00fcd\u00fcr?<\/strong><br \/>\u00c7\u00fcnk\u00fc farkl\u0131 \u00fcr\u00fcnler bozunma yolunun farkl\u0131 k\u0131s\u0131mlar\u0131n\u0131 koruyabilir, bu nedenle ambalaj genellikle tek bir koruma s\u0131n\u0131f\u0131n\u0131n kapsad\u0131\u011f\u0131ndan daha fazla riski kapsar.<\/p>\n<p><strong>Antioksidan veya UV stabilizat\u00f6r eklemek her zaman performans\u0131 art\u0131r\u0131r m\u0131?<\/strong><br \/>Mutlaka \u00f6yle de\u011fil. A\u015f\u0131r\u0131 doz, maliyeti art\u0131rabilir ve bazen yan etkilere neden olabilir; bu nedenle \u00e7o\u011fu sistem, test edilmi\u015f bir doz aral\u0131\u011f\u0131nda en iyi performans\u0131 g\u00f6sterir.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>The function of free radical trapping agents is mainly to capture the free radicals generated during the photoaging of coatings, including alkyl radicals, alkoxy radicals, peroxy radicals, etc., and block<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-5435","post","type-post","status-publish","format-standard","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Structure, principle of action and common types of hindered amine light stabilizers (HALS) - 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