{"id":6852,"date":"2024-04-22T07:28:15","date_gmt":"2024-04-22T07:28:15","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=6852"},"modified":"2024-04-22T07:28:15","modified_gmt":"2024-04-22T07:28:15","slug":"how-to-solve-the-problem-of-discolouration-of-produced-plastic-products","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/tr\/how-to-solve-the-problem-of-discolouration-of-produced-plastic-products\/","title":{"rendered":"\u00dcretilen plastik \u00fcr\u00fcnlerin renginin solmas\u0131 sorunu nas\u0131l \u00e7\u00f6z\u00fcl\u00fcr?"},"content":{"rendered":"

\u00dcretilen plastik \u00fcr\u00fcnlerin renginin solmas\u0131 sorunu nas\u0131l \u00e7\u00f6z\u00fcl\u00fcr?<\/strong><\/h1>\n

Plastik \u00fcr\u00fcnler renk tozlar\u0131 veya masterbatchler gibi y\u00f6ntemler kullan\u0131larak renklendirilirken, renk de\u011fi\u015fimi olgusu meydana gelebilir ve bu da \u00fcr\u00fcn\u00fcn kalitesini etkileyebilir.<\/p>\n

Renk de\u011fi\u015fiminin olas\u0131 nedenleri:<\/p>\n

(1) Y\u00fcksek s\u0131cakl\u0131kta kal\u0131plama s\u0131ras\u0131nda baz re\u00e7inenin oksidatif bozunmas\u0131ndan kaynaklan\u0131r;<\/p>\n

(2) Baz ve yard\u0131mc\u0131 madde veya baz ve renklendirici pigment veya yard\u0131mc\u0131 madde ve pigment gibi plastik \u00fcr\u00fcnlerin baz\u0131 bile\u015fenleri aras\u0131ndaki kimyasal reaksiyon nedeniyle;<\/p>\n

(3) Y\u00fcksek s\u0131cakl\u0131\u011fa dayan\u0131kl\u0131 olmayan renklendirici pigment veya katk\u0131 maddelerinden vb. kaynaklan\u0131r.<\/p>\n

Bu fakt\u00f6rlerin neden oldu\u011fu renk de\u011fi\u015fimi mekanizmas\u0131n\u0131 analiz ederek, plastik \u00fcr\u00fcn \u00fcreticilerine do\u011fru hammadde se\u00e7ebilmeleri ve kaliteli plastik \u00fcr\u00fcnler \u00fcretebilmeleri i\u00e7in referans sa\u011flamakt\u0131r.<\/p>\n

-Plastik kal\u0131plama i\u015fleminden kaynaklanan renk de\u011fi\u015fimi<\/p>\n

1. Y\u00fcksek s\u0131cakl\u0131kta kal\u0131plama s\u0131ras\u0131nda baz re\u00e7inenin oksidatif bozunmas\u0131 ve renk de\u011fi\u015fimi.<\/p>\n

Plastik kal\u0131plama ekipman\u0131n\u0131n \u0131s\u0131tma halkas\u0131 veya \u0131s\u0131tma plakas\u0131 kontrol d\u0131\u015f\u0131 oldu\u011funda ve her zaman \u0131s\u0131tma durumunda oldu\u011funda, yerel s\u0131cakl\u0131\u011f\u0131n \u00e7ok y\u00fcksek olmas\u0131na neden olmak kolayd\u0131r, b\u00f6ylece re\u00e7ine oksidatif ayr\u0131\u015fmas\u0131 y\u00fcksek s\u0131cakl\u0131kta meydana gelir, PVC vb. gibi \u0131s\u0131ya duyarl\u0131 plastikler i\u00e7in, kal\u0131plama i\u015flemi s\u0131ras\u0131nda bu fenomenin ortaya \u00e7\u0131kmas\u0131 daha olas\u0131d\u0131r ve ciddi oldu\u011funda, yanacak ve sar\u0131ya d\u00f6necek, hatta kararacak ve \u00e7ok say\u0131da d\u00fc\u015f\u00fck molek\u00fcler u\u00e7ucu madde ka\u00e7acakt\u0131r.<\/p>\n

Bu bozunma depolimerizasyon, rastgele zincir k\u0131r\u0131lmas\u0131, yan grup ve d\u00fc\u015f\u00fck molek\u00fcl giderimi ve di\u011fer reaksiyonlar\u0131 i\u00e7erir.<\/p>\n

 <\/p>\n

(1) Depolimerizasyon<\/p>\n

Depolimerizasyon reaksiyonu ilk olarak makromolek\u00fclde k\u0131r\u0131lman\u0131n sonunda ve daha sonra zincir mekanizmas\u0131na g\u00f6re monomeri h\u0131zl\u0131 bir \u015fekilde uzakla\u015ft\u0131rmak i\u00e7in, polimerizasyonda s\u0131cakl\u0131\u011f\u0131n \u00fcst s\u0131n\u0131r\u0131n\u0131n \u00fczerinde ger\u00e7ekle\u015ftirilmesi \u00f6zellikle kolayd\u0131r.<\/p>\n

 <\/p>\n

(2) Rastgele zincir k\u0131r\u0131lmas\u0131 (bozulma)<\/p>\n

Y\u00fcksek s\u0131cakl\u0131kta kal\u0131plamada PE ve di\u011fer polimerler gibi polimerler i\u00e7in, ana zinciri herhangi bir pozisyonda k\u0131r\u0131labilir, molek\u00fcler a\u011f\u0131rl\u0131k h\u0131zla azal\u0131r, ancak monomer verimi \u00e7ok k\u00fc\u00e7\u00fckt\u00fcr, bu t\u00fcr reaksiyona rastgele zincir k\u0131r\u0131lmas\u0131 denir, bazen bozunma olarak da adland\u0131r\u0131l\u0131r, serbest radikallerin olu\u015fumunun polietilen zincir k\u0131r\u0131lmas\u0131 \u00e7ok aktiftir, \u00e7ok say\u0131da ikincil hidrojenle \u00e7evrilidir, zincir transfer reaksiyonu kolayd\u0131r, neredeyse hi\u00e7 monomer \u00fcretimi yoktur.<\/p>\n

 <\/p>\n

(3) S\u00fcbstit\u00fcent \u00e7\u0131karma<\/p>\n

Polivinil klor\u00fcr, polivinil asetat, poliakrilonitril, polifloroetilen, vb. Is\u0131t\u0131ld\u0131\u011f\u0131nda, s\u00fcbstit\u00fcent grup \u00e7\u0131kar\u0131lacakt\u0131r. Polivinil klor\u00fcr (PVC), \u00f6rne\u011fin, 180 ~ 200 \u2103 alt\u0131ndaki s\u0131cakl\u0131kta PVC i\u015fleme kal\u0131plama, ancak daha d\u00fc\u015f\u00fck s\u0131cakl\u0131klarda (100 ~ 120 \u2103 gibi), yani dehidrojenasyonun ba\u015flang\u0131c\u0131 (HCl), 200 \u2103 civar\u0131nda HCl kayb\u0131 \u00e7ok h\u0131zl\u0131 bir \u015fekilde, b\u00f6ylece polimer koyu bir renge d\u00f6n\u00fc\u015f\u00fcr, daha d\u00fc\u015f\u00fck mukavemet, toplam reaksiyon k\u0131saca a\u015fa\u011f\u0131daki gibi tan\u0131mlan\u0131r: ~ ~ CH2CHCICH2CHCl ~ \u2192 \u2192 ~ CH=CHCH=CH \uff5e+2HCl<\/p>\n

Serbest HCl, hidrojen klor\u00fcr\u00fcn, hidrojen klor\u00fcr gibi metal klor\u00fcrlerin ve ferrik klor\u00fcr olu\u015fturmak i\u00e7in i\u015fleme ekipman\u0131n\u0131n \u00e7\u0131kar\u0131lmas\u0131 \u00fczerinde katalitik bir etkiye sahiptir, katalitik te\u015fvik etmek i\u00e7in: 3HCl + Fe \u2192 FeCl3 + 3HCl<\/p>\n

Is\u0131l i\u015flemde PVC, stabilitesini art\u0131rmak i\u00e7in baryum stearat, organotin, kur\u015fun bile\u015fikleri vb. gibi asit emicinin y\u00fczde birka\u00e7\u0131 eklenmelidir.<\/p>\n

Belediye telekom\u00fcnikasyon kablo hatlar\u0131n\u0131 ileti\u015fim kablolar\u0131yla renklendirirken, bak\u0131r iletken \u00fczerindeki poliolefin tabaka iyi stabilize edilmez ve polimer-bak\u0131r aray\u00fcz\u00fcnde ye\u015fil bak\u0131r karboksilat olu\u015fur. Bu reaksiyonlar bak\u0131r\u0131n polimer i\u00e7ine dif\u00fczyonunu te\u015fvik eder ve bak\u0131r\u0131n katalitik oksidasyonunu h\u0131zland\u0131r\u0131r.<\/p>\n

Bu nedenle, poliolefinlerin oksidatif bozunma oran\u0131n\u0131 azaltmak i\u00e7in, genellikle fenolik veya aromatik amin antioksidanlar (AH) eklenir, yukar\u0131daki reaksiyonu sonland\u0131r\u0131r, inaktif radikal A- olu\u015fumu: ROO- + AH - \u2192 ROOH + A-<\/p>\n

 <\/p>\n

(4) Oksidatif bozunma<\/p>\n

Polimerler i\u015fleme ve kullan\u0131m s\u0131ras\u0131nda havadaki oksijene maruz kal\u0131rlar ve \u0131s\u0131ya maruz kald\u0131klar\u0131nda oksidatif bozulma h\u0131zlan\u0131r.<\/p>\n

Poliolefinlerin termal oksidasyonu, otokatalitik davran\u0131\u015fa sahip serbest radikal zincir reaksiyonu mekanizmas\u0131na aittir ve ba\u015flatma, b\u00fcy\u00fcme ve sonland\u0131rma olmak \u00fczere \u00fc\u00e7 a\u015famaya ayr\u0131labilir.<\/p>\n

Hidroperoksit grubunun neden oldu\u011fu zincir k\u0131r\u0131lmas\u0131 molek\u00fcler a\u011f\u0131rl\u0131kta bir azalmaya yol a\u00e7ar ve homolitik b\u00f6l\u00fcnmesinin ana \u00fcr\u00fcnleri alkoller, aldehitler, ketonlar ve son olarak karboksilik asitlere oksitlenir. Karboksilik asit, metal katalizli oksidasyonda \u00f6nemli bir rol oynar.<\/p>\n

 <\/p>\n

2. Plastik kal\u0131plama ve i\u015fleme s\u0131ras\u0131nda, renklendirici madde y\u00fcksek s\u0131cakl\u0131k tahamm\u00fcls\u00fczl\u00fc\u011f\u00fc nedeniyle ayr\u0131\u015facak ve renk de\u011fi\u015ftirecektir.<\/p>\n

Plastikleri renklendirmek i\u00e7in kullan\u0131lan pigmentlerin veya boyalar\u0131n s\u0131cakl\u0131k direnci s\u0131n\u0131r\u0131 vard\u0131r, s\u0131cakl\u0131k bu s\u0131n\u0131ra ula\u015ft\u0131\u011f\u0131nda, pigmentler veya boyalar kimyasal de\u011fi\u015fikliklere u\u011frayacak ve reaksiyon form\u00fcl\u00fc daha karma\u015f\u0131k olan \u00e7e\u015fitli d\u00fc\u015f\u00fck molek\u00fcler a\u011f\u0131rl\u0131kl\u0131 bile\u015fikler \u00fcretecektir; farkl\u0131 pigmentlerin farkl\u0131 reaksiyonlar\u0131 ve \u00fcr\u00fcnleri vard\u0131r ve farkl\u0131 pigmentlerin s\u0131cakl\u0131k direnci, a\u011f\u0131rl\u0131k kayb\u0131 ve di\u011fer analitik y\u00f6ntemlerle tespit edilebilir.<\/p>\n

-Renklendirici ve re\u00e7ine aras\u0131ndaki reaksiyonun neden oldu\u011fu renk de\u011fi\u015fimi<\/p>\n

Renklendirici ve re\u00e7ine aras\u0131ndaki reaksiyon esas olarak i\u015fleme ve kal\u0131plama s\u0131ras\u0131nda baz\u0131 pigmentler veya boyalar ve re\u00e7inede ortaya \u00e7\u0131kar, bu kimyasal reaksiyonlar renk faz\u0131n\u0131n de\u011fi\u015fmesine ve polimerin bozulmas\u0131na yol a\u00e7acak, b\u00f6ylece \u00fcr\u00fcnlerin performans\u0131 de\u011fi\u015fecektir.<\/p>\n

1. \u0130ndirgeme reaksiyonu<\/p>\n

Erimi\u015f haldeki naylon ve amino plastikler gibi baz\u0131 polimerler, \u00e7ok g\u00fc\u00e7l\u00fc bir asidik indirgeyici maddedir, i\u015fleme s\u0131cakl\u0131\u011f\u0131nda \u00e7ok kararl\u0131 pigmentler veya boyalar solmaya indirgenir.<\/p>\n

2. Alkali de\u011fi\u015fim etkisi<\/p>\n

PVC em\u00fclsiyon polimerindeki veya baz\u0131 stabilize polipropilenlerdeki toprak alkali metaller, renklendirici maddedeki toprak alkali metallerle \"alkali de\u011fi\u015fimi\" yapabilir ve b\u00f6ylece rengin mavi-k\u0131rm\u0131z\u0131dan turuncuya d\u00f6n\u00fc\u015fmesini sa\u011flayabilir.<\/p>\n

PVC em\u00fclsiyon polimeri, kar\u0131\u015ft\u0131rma polimerizasyon y\u00f6ntemi yard\u0131m\u0131yla em\u00fclgat\u00f6r (sodyum dodesil s\u00fclfat C12H25SO3Na gibi) sulu \u00e7\u00f6zeltisinde VC'dir, reaksiyon Na + i\u00e7erir; PP'nin \u0131s\u0131 ve oksijen performans\u0131n\u0131 art\u0131rmak i\u00e7in genellikle 1010, DLTDP ve di\u011fer antioksidanlar eklenir, antioksidanlar 1010, 3,5 a 4 hidroksipropanoik asit metil ester ve sodyum pentaeritritol katalizli ester de\u011fi\u015fim reaksiyonu ile tersiyer-b\u00fctildir. DLTDP, tiyodipropiyonitril haz\u0131rlamak i\u00e7in Na2S sulu \u00e7\u00f6zeltisi ve akrilonitril reaksiyonu ile haz\u0131rlan\u0131r, tiyodipropiyonik asit olu\u015fturmak i\u00e7in hidrolize edilir ve son olarak lauril alkol ile esterle\u015ftirilir, reaksiyon ayr\u0131ca Na + i\u00e7erir.<\/p>\n

Plastik \u00fcr\u00fcnler kal\u0131plan\u0131rken, re\u00e7inede kalan Na+, C.I.Pigment-Red48:2 (BBC veya 2BP) gibi metal iyonlar\u0131 i\u00e7eren renk \u00e7\u00f6keltme pigmenti ile reaksiyona girecektir: XCa2++2Na+\u21922XNa++Ca2+.<\/p>\n

3. Pigment ve hidrojen halojen\u00fcr (HX) aras\u0131ndaki reaksiyon<\/p>\n

PVC, s\u0131cakl\u0131k 170\u00b0C'ye y\u00fckseldi\u011finde veya \u0131\u015f\u0131k etkisi alt\u0131nda HCI'ye dekonjuge olur ve konjuge \u00e7ift ba\u011flar olu\u015fturur.<\/p>\n

Halojen i\u00e7eren alev geciktirici poliolefin veya renkli alev geciktirici plastik \u00fcr\u00fcnler de y\u00fcksek s\u0131cakl\u0131kta kal\u0131plamada hidrojen HX ile dehalojenize edilir.<\/p>\n

(1) Ultramarin ve HX aras\u0131ndaki reaksiyon<\/p>\n

Plastiklerin renklendirilmesinde veya sar\u0131 \u0131\u015f\u0131\u011f\u0131n giderilmesinde yayg\u0131n olarak kullan\u0131lan Ultramarin pigmenti, s\u00fclf\u00fcr i\u00e7eren bir komplekstir.<\/p>\n

(2) Bak\u0131r pigmenti PVC re\u00e7inesinin oksidatif ayr\u0131\u015fmas\u0131n\u0131 h\u0131zland\u0131r\u0131r.<\/p>\n

Bak\u0131r pigmenti y\u00fcksek s\u0131cakl\u0131kta oksitlenerek Cu+ ve Cu2+ olu\u015fturabilir, bu da PVC'nin ayr\u0131\u015fmas\u0131n\u0131 h\u0131zland\u0131racakt\u0131r.<\/p>\n

(3) Metal iyonlar\u0131n\u0131n polimer \u00fczerindeki y\u0131k\u0131c\u0131 etkisi<\/p>\n

Manganez pigmenti C.I. gibi baz\u0131 pigmentlerin polimerler \u00fczerinde y\u0131k\u0131c\u0131 etkisi vard\u0131r.PigmentRed48:4 PP plastik \u00fcr\u00fcnlerin kal\u0131planmas\u0131 i\u00e7in uygun de\u011fildir, bunun nedeni, de\u011fi\u015fken de\u011ferlikli metalin manganez iyonlar\u0131n\u0131n, PP'nin termal oksidasyonunda veya foto-oksidasyonunda elektron transferi yoluyla hidroperoksitlerin ayr\u0131\u015fmas\u0131n\u0131 katalize etmesi ve bu da PP'nin ya\u015flanmas\u0131n\u0131n h\u0131zlanmas\u0131na yol a\u00e7mas\u0131d\u0131r; polikarbonat\u0131n ester ba\u011f\u0131n\u0131n \u0131s\u0131t\u0131ld\u0131\u011f\u0131nda hidrolize olmas\u0131 ve alkali kar\u015f\u0131s\u0131nda ayr\u0131\u015fmas\u0131 kolayd\u0131r ve metal iyonlar\u0131 pigmentte oldu\u011funda ayr\u0131\u015fmay\u0131 daha kolay te\u015fvik edecektir; metal iyonlar\u0131 ayr\u0131\u015fmay\u0131 daha kolay te\u015fvik edecektir. Pigmentte metal iyonlar\u0131 oldu\u011funda, ayr\u0131\u015fmay\u0131 te\u015fvik etmek daha kolayd\u0131r; metal iyonlar\u0131 ayr\u0131ca PVC ve di\u011fer re\u00e7inelerin termo-oksidatif ayr\u0131\u015fmas\u0131n\u0131 te\u015fvik edecek ve renk de\u011fi\u015fikliklerine yol a\u00e7acakt\u0131r.<\/p>\n

\u00d6zetle, plastik \u00fcr\u00fcnler \u00fcretirken re\u00e7ine ile reaksiyona giren renklendirici pigment kullanmaktan ka\u00e7\u0131nmam\u0131z en uygulanabilir ve etkili yoldur.<\/p>\n

-Renklendiriciler ve yard\u0131mc\u0131 maddeler aras\u0131ndaki reaksiyon<\/p>\n

1\u3001S\u00fclf\u00fcr i\u00e7eren pigment ve yard\u0131mc\u0131 maddeler aras\u0131ndaki reaksiyon<\/p>\n

Kadmiyum sar\u0131s\u0131 (CdS ve CdSe'nin kat\u0131 \u00e7\u00f6zeltisi) gibi s\u00fclf\u00fcr i\u00e7eren pigmentler, zay\u0131f asit direnci nedeniyle PVC'de kullan\u0131lmamal\u0131 ve kur\u015fun i\u00e7eren yard\u0131mc\u0131 maddelerle birlikte kullan\u0131lmamal\u0131d\u0131r.<\/p>\n

2\u3001Kur\u015fun i\u00e7eren bile\u015fikler ile s\u00fclf\u00fcr i\u00e7eren stabilizat\u00f6rler aras\u0131ndaki reaksiyon<\/p>\n

Kur\u015fun bile\u015feninde krom sar\u0131s\u0131 pigment veya molibden krom k\u0131rm\u0131z\u0131s\u0131 ve tiyodistearat DSTDP reaksiyonu gibi antioksidan.<\/p>\n

3\u3001Pigment ve antioksidan aras\u0131ndaki reaksiyon<\/p>\n

PP gibi antioksidan i\u00e7eren re\u00e7inelerde, baz\u0131 pigmentler ve antioksidanlar da reaksiyona girerek antioksidan\u0131n i\u015flevini zay\u0131flat\u0131r ve re\u00e7inenin termal ve oksijen stabilitesini d\u00fc\u015f\u00fcr\u00fcr.<\/p>\n

\u00d6rne\u011fin, fenolik antioksidan karbon siyah\u0131 taraf\u0131ndan kolayca emilebilir veya onunla reaksiyona girerek aktivitesini kaybedebilir; fenolik antioksidan ve titanyum iyonu beyaz veya a\u00e7\u0131k renkli plastik \u00fcr\u00fcnlerde fenolik aromatik kompleks olu\u015fturarak \u00fcr\u00fcnlerin sararmas\u0131na neden olur, uygun antioksidan\u0131 se\u00e7erek veya \u00e7inko antiasit tuzu (\u00e7inko stearat) veya P2 tipi fosfit gibi yard\u0131mc\u0131 katk\u0131 maddeleri ekleyerek beyaz pigmentin (TiO2) renk de\u011fi\u015ftirmesini \u00f6nleyebiliriz.<\/p>\n

4\u3001Pigment ve \u0131\u015f\u0131k dengeleyici aras\u0131ndaki reaksiyon<\/p>\n

Pigment ve \u0131\u015f\u0131k stabilizat\u00f6r\u00fc reaksiyona girdi\u011finde, daha \u00f6nce bahsedilen s\u00fclf\u00fcr i\u00e7eren pigment ve nikel i\u00e7eren \u0131\u015f\u0131k stabilizat\u00f6r\u00fc aras\u0131ndaki reaksiyona ek olarak, genel olarak \u0131\u015f\u0131k stabilizat\u00f6r\u00fcn\u00fcn etkisini azaltacakt\u0131r. \u00d6zellikle amin \u0131\u015f\u0131k stabilizat\u00f6r\u00fc ve azo sar\u0131 ve k\u0131rm\u0131z\u0131 pigmentin engelleyici rol\u00fcnden etkilendi\u011finde, \u0131\u015f\u0131k stabilize edici etki daha da belirgin bir \u015fekilde azal\u0131r ve renksiz stabilize edici etki kadar iyi de\u011fildir ve \u015fu anda bu fenomen i\u00e7in kesin bir a\u00e7\u0131klama yoktur.<\/p>\n

-Yard\u0131mc\u0131lar aras\u0131nda reaksiyon<\/p>\n

Bir\u00e7ok yard\u0131mc\u0131 madde yanl\u0131\u015f kullan\u0131l\u0131rsa, beklenmedik reaksiyonlar meydana gelebilir ve \u00fcr\u00fcnlerin renk de\u011fi\u015ftirmesine neden olabilir. \u00d6rne\u011fin, alev geciktirici Sb2O3, Sb2S3 olu\u015fturmak \u00fczere s\u00fclf\u00fcr ile reaksiyona girer: Sb2O3+-S-\u2192Sb2S3+-O-.<\/p>\n

Bu nedenle, \u00fcretim form\u00fcl\u00fc g\u00f6z \u00f6n\u00fcnde bulunduruldu\u011funda, yard\u0131mc\u0131 maddeler dikkatle se\u00e7ilmelidir.<\/p>\n

-Katk\u0131 maddelerinin oto-oksidasyonu nedeniyle renk de\u011fi\u015fimi<\/p>\n

Fenolik stabilizat\u00f6rlerin otomatik oksidasyonu, beyaz veya a\u00e7\u0131k renkli \u00fcr\u00fcnlerin renk de\u011fi\u015fimini te\u015fvik eden \u00f6nemli bir fakt\u00f6rd\u00fcr ve bu durum yabanc\u0131 \u00fclkelerde genellikle \"Pinking\" (k\u0131rm\u0131z\u0131ms\u0131) olarak adland\u0131r\u0131l\u0131r.<\/p>\n

BHT antioksidan\u0131 (2-6-di-tert-butil-4-metilfenol) gibi oksidasyon \u00fcr\u00fcnleri ile birle\u015fir ve 3,3\u2032,5,5\u2032 a homostilben kinon a\u00e7\u0131k k\u0131rm\u0131z\u0131 reaksiyon \u00fcr\u00fcn\u00fc olarak \u015fekillenir, bu t\u00fcr renk de\u011fi\u015fikli\u011fi sadece oksijen ve su varl\u0131\u011f\u0131nda ve \u0131\u015f\u0131k yoklu\u011funda meydana gelir, ultraviyole \u0131\u015f\u0131\u011fa maruz kalma, a\u00e7\u0131k k\u0131rm\u0131z\u0131 homostilben kinon h\u0131zla sar\u0131 monosiklik bir \u00fcr\u00fcne ayr\u0131\u015f\u0131r.<\/p>\n

-Renklendirici pigmentlerin \u0131\u015f\u0131k ve \u0131s\u0131 etkisi alt\u0131nda renk de\u011fi\u015ftirmesi<\/p>\n

I\u015f\u0131k ve \u0131s\u0131 etkisi alt\u0131nda, baz\u0131 renklendirici pigmentlerin molek\u00fcler konfig\u00fcrasyonu izomerizme d\u00f6n\u00fc\u015f\u00fcr, \u00f6rne\u011fin, C.I.Pig.R2(BBC) pigmentinin kullan\u0131m\u0131, orijinal konjugasyon etkisini de\u011fi\u015ftiren ve konjugat ba\u011f\u0131n\u0131n azalmas\u0131na neden olan azo tipinden kinon tipine d\u00f6n\u00fc\u015f\u00fcr ve rengin koyu mavi-k\u0131rm\u0131z\u0131dan a\u00e7\u0131k turuncu-k\u0131rm\u0131z\u0131ya de\u011fi\u015fmesine neden olur.<\/p>\n

Ayn\u0131 zamanda, \u0131\u015f\u0131\u011f\u0131n katalitik etkisi alt\u0131nda, su ile ayr\u0131\u015farak e\u015f kristalli suda de\u011fi\u015fikliklere ve solmaya neden olur.<\/p>\n

-Atmosferik kirleticilerin neden oldu\u011fu renk de\u011fi\u015fimi<\/p>\n

Plastik \u00fcr\u00fcnler depoland\u0131\u011f\u0131nda veya kullan\u0131ld\u0131\u011f\u0131nda, re\u00e7ine veya katk\u0131 maddeleri veya renklendirici pigmentler ne olursa olsun, \u0131\u015f\u0131k ve \u0131s\u0131 etkisi alt\u0131nda baz\u0131 reaktif gruplar nem veya atmosferdeki asit ve alkali gibi kimyasal kirleticilerle etkile\u015fime girerek \u00e7e\u015fitli karma\u015f\u0131k kimyasal reaksiyonlara neden olacak ve bu da uzun vadede renk bozulmas\u0131na veya renk atmas\u0131na yol a\u00e7acakt\u0131r.<\/p>\n

Uygun \u0131s\u0131 ve oksijen stabilizat\u00f6rleri, \u0131\u015f\u0131k stabilizat\u00f6rleri eklenerek veya y\u00fcksek kaliteli ya\u015fland\u0131rma katk\u0131 maddeleri ve pigmentler se\u00e7ilerek bu durum \u00f6nlenebilir veya hafifletilebilir.<\/p>","protected":false},"excerpt":{"rendered":"

\u00dcretilen plastik \u00fcr\u00fcnlerde renk de\u011fi\u015fimi sorunu nas\u0131l \u00e7\u00f6z\u00fcl\u00fcr? Plastik \u00fcr\u00fcnler renk tozlar\u0131 veya masterbatchler gibi y\u00f6ntemler kullan\u0131larak renklendirilirken, renk de\u011fi\u015fimi olgusu ortaya \u00e7\u0131kabilir ve bu da \u00fcr\u00fcn\u00fcn kalitesini etkileyebilir. Renk de\u011fi\u015fiminin olas\u0131 nedenleri: (1) Y\u00fcksek s\u0131cakl\u0131kta kal\u0131plama s\u0131ras\u0131nda baz re\u00e7inenin oksidatif bozunmas\u0131ndan kaynaklan\u0131r; [...]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[],"class_list":["post-6852","post","type-post","status-publish","format-standard","hentry","category-soresyn-resin"],"yoast_head":"\nHow to solve the problem of discolouration of produced plastic products? - Longchang Chemical<\/title>\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\/tr\/how-to-solve-the-problem-of-discolouration-of-produced-plastic-products\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to solve the problem of discolouration of produced plastic products? - Longchang Chemical\" \/>\n<meta property=\"og:description\" content=\"How to solve the problem of discolouration of produced plastic products? \u25cf When colouring plastic products using methods such as colour powders or masterbatches, the phenomenon of colour change may occur, thus affecting the quality of the product. 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