<\/p>\n
Quick answer:<\/strong> In practical UV formulation work, resin and monomer selection starts with the end-use property target, then tunes viscosity and cure response around it. Buyers usually shortlist a few matched packages, not a single magic raw material.<\/p>\n <\/p>\n \u00c7ekirdekle\u015ftirici maddenin tan\u0131m\u0131<\/p>\n \u00c7ekirdekle\u015ftirici madde, re\u00e7inenin kristalle\u015fme davran\u0131\u015f\u0131n\u0131 de\u011fi\u015ftirerek, kristalle\u015fme oran\u0131n\u0131 h\u0131zland\u0131rarak, kristalle\u015fme yo\u011funlu\u011funu art\u0131rarak ve tane boyutunun mikrofabrikasyonunu te\u015fvik ederek kal\u0131plama d\u00f6ng\u00fcs\u00fcn\u00fc k\u0131saltmak, \u015feffafl\u0131\u011f\u0131, gerilme mukavemetini, sertli\u011fi, toklu\u011fu ve \u00fcr\u00fcnlerin di\u011fer fiziksel ve mekanik \u00f6zelliklerini iyile\u015ftirmek i\u00e7in polietilen, polipropilen ve di\u011fer tam olarak kristalle\u015fmemi\u015f plastiklere uygulanan yeni bir fonksiyonel katk\u0131 maddesidir.<\/p>\n <\/p>\n \u00c7ekirdekle\u015ftirici ajan etki mekanizmas\u0131 (PP \u00fcr\u00fcnleri)<\/p>\n \u00c7ekirdekle\u015ftirici madde plasti\u011fe eklendi\u011finde, \u00e7ekirdekle\u015ftirici madde partik\u00fclleri kristal \u00e7ekirdek rol\u00fc oynar, yani d\u0131\u015far\u0131dan daha fazla \u00e7ekirdek eklenir, bu da plastiklerin kristalle\u015fmesi i\u00e7in iyi bir s\u0131cak yatak sa\u011flar ve b\u00f6ylece kristalle\u015fmeyi te\u015fvik eder.<\/p>\n Genel olarak, \u00e7ekirdekle\u015ftirici madde partik\u00fclleri yeterli en-boy oran\u0131na sahip olmal\u0131d\u0131r. Bununla birlikte, \u00e7ekirdekle\u015ftirici maddeler genel olarak malzeme i\u00e7inde, \u00f6zellikle d\u00fcz par\u00e7alar\u0131n boylamas\u0131na ve enlemesine y\u00f6n\u00fcnde (MD\/TD) g\u00fc\u00e7l\u00fc ve anizotropik bir kristalle\u015fme y\u00f6nelimine neden olma e\u011filimindedir. Bu farkl\u0131 b\u00fcz\u00fclme ve dengesiz y\u00f6nelim, kal\u0131plama sonras\u0131nda \u00e7arp\u0131lmaya yol a\u00e7abilen kat\u0131 faz bas\u0131n\u00e7l\u0131 \u015fekillendirme (SPPF) gibi baz\u0131 i\u015flemlerde daha da ortaya \u00e7\u0131kabilir.<\/p>\n Bu nedenle, iyi bir \u00e7ekirdeklendirme maddesi PP par\u00e7an\u0131n uzunlamas\u0131na ve enine d\u00fczlemlerinde dengeli bir kristal y\u00f6nelimi sa\u011flayabilmeli, b\u00f6ylece m\u00fckemmel boyutsal stabilite sa\u011flamal\u0131 ve \u00e7arp\u0131lma ve b\u00fcz\u00fclme sorunlar\u0131n\u0131 azaltmal\u0131d\u0131r.<\/p>\n Yayg\u0131n \u00e7ekirdekle\u015ftirici maddelerin s\u0131n\u0131fland\u0131r\u0131lmas\u0131<\/p>\n (1) Alfa kristal \u00e7ekirdekle\u015ftirici madde:<\/p>\n Esas olarak \u00fcr\u00fcn\u00fcn \u015feffafl\u0131\u011f\u0131n\u0131, y\u00fczey parlakl\u0131\u011f\u0131n\u0131, sertli\u011fini, \u0131s\u0131 sapma s\u0131cakl\u0131\u011f\u0131n\u0131 iyile\u015ftirir ve ayr\u0131ca \u015feffaf ajan, ge\u00e7irgenlik artt\u0131r\u0131c\u0131, sertlik artt\u0131r\u0131c\u0131 olarak da bilinir. Esas olarak \u00e7atall\u0131 sorbitol (DBS) ve t\u00fcrevleri, aromatik fosfat tuzlar\u0131, benzoik asit tuzlar\u0131n\u0131n ikamesi vb. dahil olmak \u00fczere, \u00f6zellikle DBS \u00e7ekirdekle\u015ftirici \u015feffaf ajan uygulamas\u0131 en yayg\u0131n olan\u0131d\u0131r.<\/p>\n Alfa kristal \u00e7ekirdekle\u015ftirici maddeler yap\u0131lar\u0131na g\u00f6re inorganik ve organik olarak ikiye ayr\u0131labilir.<\/p>\n (1) \u0130norganik s\u0131n\u0131f<\/p>\n \u0130norganik \u00e7ekirdekle\u015ftirici maddeler ba\u015fl\u0131ca talk, kalsiyum oksit, karbon siyah\u0131, kalsiyum karbonat, mika, inorganik pigmentler, kaolin ve kataliz\u00f6r kal\u0131nt\u0131lar\u0131n\u0131 i\u00e7erir. Bunlar en erken geli\u015ftirilen ucuz ve pratik \u00e7ekirdekle\u015ftirici maddelerdir, en \u00e7ok ara\u015ft\u0131r\u0131lan ve uygulananlar talk, mika vb.dir.<\/p>\n (2) Organik<\/p>\n (a) karboksilik asit metal tuzlar\u0131: sodyum s\u00fcksinat, sodyum glutarat, sodyum hekzanoat potasyum benzoat, lityum benzoat, sodyum sinnamat, sodyum \u03b2-naftoat vb. Bunlar aras\u0131nda benzoik asit alkali metal veya al\u00fcminyum tuzu, tert-butil benzoik asit al\u00fcminyum tuzu vb. Etki daha iyidir, kullan\u0131m ge\u00e7mi\u015fi daha uzundur, ancak \u015feffafl\u0131k zay\u0131ft\u0131r.<\/p>\n (b) fosfat metal tuzlar\u0131: organik fosfatlar temel olarak fosfat ester metal tuzlar\u0131n\u0131 ve fosfat ester alkali metal maddeleri ve bunlar\u0131n komplekslerini vb. i\u00e7erir. Bu tip \u00e7ekirdekle\u015ftirici ajan \u015feffafl\u0131k, sertlik, kristalle\u015fme h\u0131z\u0131 vb. ile karakterize edilir, ancak zay\u0131f da\u011f\u0131l\u0131m g\u00f6sterir.<\/p>\n (c) sorbitol benzil \u00e7atal t\u00fcrevleri: \u00fcr\u00fcnlerin \u015feffafl\u0131\u011f\u0131, y\u00fczey parlakl\u0131\u011f\u0131, sertli\u011fi ve di\u011fer termomekanik \u00f6zellikleri \u00f6nemli bir iyile\u015ftirme etkisine sahiptir ve PP ile iyi bir uyumlulu\u011fa sahiptir, \u015fu anda derinlemesine incelenmekte olan bir \u015feffaf \u00e7ekirdekle\u015ftirici madde s\u0131n\u0131f\u0131d\u0131r. \u0130yi performans\u0131, d\u00fc\u015f\u00fck fiyat\u0131, yurti\u00e7inde ve yurtd\u0131\u015f\u0131nda en aktif geli\u015fme, en \u00e7ok \u00e7e\u015fit, en b\u00fcy\u00fck \u00fcretim ve bir \u00e7ekirdekle\u015ftirici ajan s\u0131n\u0131f\u0131n\u0131n sat\u0131\u015f\u0131 haline gelmi\u015ftir. Esas olarak dibenzil \u00e7atal sorbitol (DBS), iki (bir metil benzil \u00e7atal\u0131na) sorbitol (P-M-DBS), vb. vard\u0131r.<\/p>\n (d) y\u00fcksek erime noktal\u0131 polimer tipi \u00e7ekirdekle\u015ftirici ajan: \u015fu anda, esas olarak polivinil sikloheksan, polivinil pentan, etilen \/ akrilat kopolimeri, vb. vard\u0131r. Poliolefin re\u00e7ine ile \u00e7ok az kar\u0131\u015fabilir ve iyi bir dispersiyona sahiptir.<\/p>\n (2) \u03b2-kristal \u00e7ekirdekle\u015ftirici ajan<\/p>\n Y\u00fcksek \u03b2-kristal i\u00e7eri\u011fine sahip polipropilen \u00fcr\u00fcnler elde etmek i\u00e7in tasarlanm\u0131\u015flard\u0131r ve \u00fcr\u00fcnlerin \u0131s\u0131 sapma s\u0131cakl\u0131\u011f\u0131n\u0131 d\u00fc\u015f\u00fcrmeden veya hatta y\u00fckseltmeden \u00fcr\u00fcnlerin darbe direncini art\u0131rma avantaj\u0131na sahiptirler, b\u00f6ylece darbe direnci ve \u0131s\u0131 sapmas\u0131n\u0131n iki \u00e7eli\u015fkili y\u00f6n\u00fc dengelenebilir.<\/p>\n Bir grup, yar\u0131 d\u00fczlemsel yap\u0131lara sahip az say\u0131da kal\u0131n halka bile\u015fikleridir.<\/p>\n Di\u011fer grup, periyodik tablonun IIA grubundaki metallerin oksitleri, hidroksitleri ve tuzlar\u0131 ile belirli dikarboksilik asitlerden olu\u015fur. Polimerdeki farkl\u0131 kristal formlar\u0131n\u0131n oran\u0131n\u0131 de\u011fi\u015ftirerek PP'yi modifiye edebilir.<\/p>\n <\/p>\n \u00c7ekirdekle\u015ftirici madde eklemenin a\u015fa\u011f\u0131daki etkileri vard\u0131r<\/p>\n 1\u3001PP kal\u0131plama d\u00f6ng\u00fcs\u00fcn\u00fc k\u0131salt\u0131n<\/p>\n \u00c7ekirdekle\u015ftirici madde eklemek polipropilenin yeniden kristalle\u015fme s\u0131cakl\u0131\u011f\u0131n\u0131 art\u0131rabilir, kristalle\u015fme oran\u0131n\u0131 h\u0131zland\u0131rabilir ve kristalle\u015fmeyi k\u0131sa bir so\u011futma s\u00fcresinde tamamlayabilir. 0,2% RQT-CH eklenmesi PP'nin kal\u0131plama d\u00f6ng\u00fcs\u00fcn\u00fc 7s k\u0131saltabilir ve \u00e7al\u0131\u015fma verimlili\u011fini 14% art\u0131rabilir, bu da b\u00fcy\u00fck \u00f6l\u00e7ekli enjeksiyon kal\u0131plama \u00fcr\u00fcnleri i\u00e7in \u00e7ok anlaml\u0131d\u0131r.<\/p>\n 2\u3001PP mekanik \u00f6zelliklerinin iyile\u015ftirilmesi<\/p>\n Kristalin polipropilen kristal faz\u0131n yo\u011funlu\u011fu, kristal olmayan fazdan daha y\u00fcksektir ve m\u00fckemmel mukavemete sahiptir. \u00c7ekirdekle\u015ftirici ajan olmadan, kristalin polimerler erimi\u015f halde so\u011furken kristaller \u00fcretir, bu otomatik kristalle\u015fmedir, bu top kristal tekd\u00fcze de\u011fildir, eksiktir, bu nedenle top kristal aray\u00fcz\u00fcn\u00fcn kristalin k\u0131sm\u0131 ile kristal olmayan k\u0131s\u0131m aras\u0131ndaki kuvvet, k\u0131r\u0131k taneler aras\u0131ndaki bo\u015fluk ilk yok edilecek olan; \u00c7ekirdekle\u015ftirici ajan eklerken, bilyeli kristalin b\u00fcy\u00fcmesi kontrol edilebilir, b\u00f6ylece \u00e7ekirdek artar, kristalle\u015fme daha m\u00fckemmeldir, kuvvet daha d\u00fczg\u00fcnd\u00fcr, b\u00f6ylece polimerin akma dayan\u0131m\u0131n\u0131 art\u0131rabilirsiniz Bu nedenle, polimerin akma dayan\u0131m\u0131n\u0131, darbe dayan\u0131m\u0131n\u0131 ve y\u00fczey dayan\u0131m\u0131n\u0131 art\u0131rabilir ve polipropilenin mekanik \u00f6zelliklerini iyile\u015ftirebilir.<\/p>\n 3\u3001PP'nin \u015feffafl\u0131\u011f\u0131n\u0131 ve y\u00fczey parlakl\u0131\u011f\u0131n\u0131 artt\u0131r\u0131r. Erime ve so\u011futma s\u00fcrecinde PP olarak, spontan kristalle\u015fme \u00e7ekirdeklerinin say\u0131s\u0131 \u00e7ok azd\u0131r, kristalle\u015fme h\u0131z\u0131 yava\u015ft\u0131r, b\u00fcy\u00fck k\u00fcresel kristaller olu\u015fturmak kolayd\u0131r, bu k\u00fcresel kristallerin \u00e7ap\u0131 g\u00f6r\u00fcn\u00fcr dalga boyundan \u00e7ok daha b\u00fcy\u00fckt\u00fcr ve kristal ve amorf alanlar aras\u0131ndaki k\u0131r\u0131lma indisi fark\u0131 b\u00fcy\u00fckt\u00fcr, bu da y\u00fczey \u0131\u015f\u0131\u011f\u0131n\u0131n sa\u00e7\u0131lmas\u0131na neden olarak \u015feffafl\u0131\u011f\u0131n azalmas\u0131na neden olur, bu nedenle normal i\u015fleme ko\u015fullar\u0131 alt\u0131nda yap\u0131lan polipropilen \u00fcr\u00fcnlerin \u00e7o\u011fu yar\u0131 saydamd\u0131r. \u0130yi \u015feffafl\u0131\u011fa sahip bir \u00fcr\u00fcn, y\u00fcksek kristallik, d\u00fczg\u00fcn kristal y\u00f6nelimi ve g\u00f6r\u00fcn\u00fcr \u0131\u015f\u0131\u011f\u0131n dalga boyundan daha k\u00fc\u00e7\u00fck bir kristal boyutu gereksinimlerini kar\u015f\u0131lamal\u0131d\u0131r. Polipropilenin gerekli mikro ince k\u00fcresel kristalizasyonunu elde etmek i\u00e7in, \u00e7ekirdekle\u015ftirici maddelerin eklenmesi son derece rekabet\u00e7i bir y\u00f6ntemdir [8].<\/p>\n 4. Termal \u00f6zellikler \u00fczerindeki etkisi<\/p>\n \u00c7ekirdekle\u015ftirici maddelerin eklenmesi kristalle\u015fme s\u0131cakl\u0131\u011f\u0131n\u0131 art\u0131r\u0131r, kristalle\u015fmeyi h\u0131zland\u0131r\u0131r, kristalle\u015fme derecesini art\u0131r\u0131r, yo\u011funlu\u011fu art\u0131r\u0131r ve \u0131s\u0131 sapma s\u0131cakl\u0131\u011f\u0131n\u0131 art\u0131r\u0131r, bu da re\u00e7inenin \u0131s\u0131 direncini bir dereceye kadar art\u0131rabilir.<\/p>\n <\/p>\n Most successful UV formulations are built by choosing the backbone first and then tuning the reactive monomer package around the substrate, cure method, and end-use stress. That usually produces a more stable result than choosing materials by viscosity or price alone.<\/p>\n Can one UV monomer or resin solve every formulation problem?<\/strong> Why should monomers be screened together with oligomers?<\/strong> <\/p>","protected":false},"excerpt":{"rendered":" Definition of nucleating agent Nucleating agent is a new functional additive applied to polyethylene, polypropylene and other incompletely crystallized plastics to shorten molding cycle, improve transparency, tensile strength, rigidity, toughness<\/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-6124","post","type-post","status-publish","format-standard","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"\nHow buyers usually evaluate UV monomers and resin systems<\/h2>\n
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Recommended product references<\/h3>\n
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FAQ for buyers and formulators<\/h3>\n
Usually no. Commercially strong formulas depend on how several components work together to balance cure, adhesion, flow, and durability.<\/p>\n
Because monomers can change viscosity, cure rate, shrinkage, and substrate behavior enough to alter the final ranking of the same backbone resin.<\/p>\n