{"id":3014,"date":"2020-08-24T07:41:55","date_gmt":"2020-08-24T07:41:55","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=3014"},"modified":"2026-04-28T11:19:22","modified_gmt":"2026-04-28T11:19:22","slug":"why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/nl\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/","title":{"rendered":"Waarom het fluorescerende bleekmiddel er geel uitziet en de oplossing"},"content":{"rendered":"\n

Quick answer:<\/strong> For fluorescent-whitening and food-contact discussions, buyers usually focus on specification fit, migration risk, regulatory boundaries, and how the additive behaves in the finished plastic system rather than treating it as a simple color question.<\/p>\n\n\n\n

Om de witheid van de productie te verbeteren, willen we de hoeveelheid bleekmiddel verhogen om het doel te bereiken, maar het resultaat is niet wit maar vergelende stof, door het controleren van de gegevens en het analyseren van de redenen, na vele experimenten, vonden we het vergelingpunt en de oplossing.<\/h4>\n\n\n\n\n

1, principe van fluorescerende witmakende agent<\/strong><\/h2>\n\n\n\n

Er zijn verscheidenheden van fluorescerende wittende agent, het witten van diverse vezelbehoefte verschillend merk van wittende agent, hoewel de chemische structuur en de eigenschappen van diverse wittende agent verschillend zijn, maar het het witten principe van vezel of stof is hetzelfde. Het principe van het witten is voornamelijk te wijten aan de witmaker moleculen die een totaal van geconjugeerde dubbele bindingen systeem, goede vlakheid, de speciale moleculaire structuur onder het zonlicht kan absorberen zonlicht, ultraviolet licht (golflengte van 300 ~ 400nm) en violet licht (golflengte van 420 ~ 500nm), of violet licht en vezel gemengd met het gele licht op de stof in een wit licht, dus de vezel of stof wordt merkbaar wit.<\/h4>\n\n\n\n

2 \u3001 De reden waarom witheid afneemt<\/strong><\/h2>\n\n\n\n

(1) Omdat de intensiteit van geel licht op de stof beperkt is, wordt het complementaire kleurenlicht - blauw en paars licht - dat wordt uitgezonden door fluorescerend witmakers die ultraviolet licht absorberen, ook beperkt om het gele licht te compenseren (de belangrijkste golflengte is ongeveer 570 nm).<\/h4>\n\n\n\n

(2) Het witmakende effect van fluorescerende witmaker is alleen optisch verhelderend en aanvullend, en kan het chemisch bleken niet vervangen. Daarom is het witmakende effect van fluorescerende witmaker niet ideaal voor de stof zonder bleken.<\/h4>\n\n\n\n

(3) Volgens het principe van fluorescente wittende agent, hangt het het witten effect van wittende agent hoofdzakelijk van de UVinhoud in het zonlicht en de concentratie van fluorescente wittende agent op vezel of fabric.When de UVinhoud voldoende is, verandert de concentratie van de fluorescentie wittende agent op de stof binnen een bepaalde waaier, en het wittende effect neemt met het stijgen van de concentratie van de wittende agent op de stof toe, en de blauw violette lichte intensiteit neemt ook toe, om wat geel licht op de stof te compenseren, en de stof wordt witter en witter.Wanneer de concentratie van witmakende agent aan een bepaalde juiste concentratie toeneemt, is de intensiteit van blauw violet licht die door het wordt uitgezonden precies hetzelfde als de intensiteit van geel licht op de stof, die elkaar precies annuleren, en het het witten effect is het beste, en de bleekheidswaarde is het hoogst.Maar als het verhogen van de dosering van witte agent dan de optimale concentratie, de stof op de absorptie van violet licht intensiteit graden meer dan gecompenseerd de stof op de sterkte van het gele licht, is een duidelijke witmakende agent blauw violet licht weerkaatst door, op hetzelfde moment als gevolg van de verhoogde allerlei witte agent groep in verschillende groepen, verschillende tinten van de weergegeven (zoals groen licht paars, rood, blauw, enz.) worden duidelijk weergegeven, een resultaat van de gecombineerde werking van de bovengenoemde factoren, de toename van grijze stof, de witheid vervolgens afnemen.<\/h4>\n\n\n\n

(4) Wanneer er zuur of chloorgas in opslagplaatsen van de gebleekte stof, het vochtgehalte hoog is, is het gemakkelijk om water te absorberen, als gevolg van het water vloeibaar is, Onder de moleculaire aantrekkingskracht van hydrofiele groepen, Het heeft de neiging dat de vochtterugwinning van doek dekking heeft de neiging om in evenwicht te brengen, dit is de reden waarom stof vergeling en uit te breiden in stukken, stof vlek door punt en bloeden in de bovenste en onderste lagen van stoffen.<\/h4>\n\n\n\n

(5) Onzuivere waterkwaliteit, hoge hardheid van water of zware metaalionen kunnen het witmakende effect be\u00efnvloeden.<\/h4>\n\n\n\n

3, De gele vlekken van de witmaker<\/strong><\/h2>\n\n\n\n

De optimale concentratie van het witten van agent wordt genoemd het vergelende punt van het witten van agent.The de vergelende vlekken van diverse fluorescente poetsmiddelen zijn verschillend.For bijvoorbeeld, is het vergelende punt van fluorescente wittende agent DT (die voor polyester wordt gebruikt) 0.8%, d.w.z., wanneer de hoeveelheid DT wittende agent 0 overschrijdt.8%, zijn witheidswaarde vermindert met de verhoging van het bedrag.Het vergelende punt van fluorescente wittende agent VBL (die voor zuivere katoenen stof wordt gebruikt) was 0.5 %.De vergelende vlek van fluorescente wittende agent DCB (die voor het witten van acrylvezel wordt gebruikt) was 0.8%.Het vergelende punt van fluorescente wittende agent CH (die voor acryl opgebulkt garen wordt gebruikt) is 3.3 %. BlankophorBBU (vloeistof, Bayer producten, voor zuivere katoenen weefsels) had een vergelingpunt van 1.26%; Uvite ERN - P (een product van CGY bedrijf gebruikt in polyesterweefsel) heeft een vergelingpunt van 0.8%; Uvite EBF 250 %C pulp MCGY producten, gebruikt in polyesterweefsels) vergelingpunt van 3 %.<\/h4>\n\n\n\n

4\u3001 Oplossingen<\/strong><\/h2>\n\n\n\n

(1) Een reeks overeenkomstige maatregelen moet worden genomen in het productieproces, zoals in het proces van koken en bleken, moet de was na het beitsen voldoende zijn; inzepen om het residu van zeep te minimaliseren; zacht water moet worden gebruikt om te bleken en de pH-waarde moet alkalisch zijn (pH8~9).De fluorescerende witmaker moet kiezen voor producten met een goede zuurbestendigheid, zoals Uvitex RT, CF, BT (ciba -jiagi company); Tinopal2B, SP (ciba -jiaggi), Leucophor B (sandex); BlankophorBBU (Bayer, inc.), enzovoort.<\/h4>\n\n\n\n

(2) Het traditionele proces is: schuren en bleken - heet water wassen - zuur - deoxidatie - water wassen.Glacial azijnzuur werd gewassen na heet water.Glacial azijnzuur is vluchtig zuur, slechte permeabiliteit, kan alleen neutraliseren de natronloog op vezel oppervlak, is het moeilijk door te dringen in de vezel interieur.Vooral dikke stoffen, verlaten vaak overblijvend natronloog in de interne vezel. Daarom kan het neutraliserende zuur niet alleen natronloog op de oppervlakte van de vezel neutraliseren, maar ook natronloog binnen de vezel neutraliseren, zodat het effect van volledige neutralisatie kan worden bereikt. Ondertussen moeten de tijd en de temperatuur van oververzuring strikt gecontroleerd worden om volledig te neutraliseren. Dit is vooral belangrijk voor het bleken van zware stoffen met een gewicht van 190 g\/m2 of meer.<\/h4>\n\n\n\n

(3) Kationische verzachter, zwak kationische verzachter en gewone siliconenolie kunnen verschillende gradaties van vergeling van witte weefsels veroorzaken. Anionverzachter veroorzaakt over het algemeen geen vergeling en heeft de voorkeur voor witte weefsels.<\/h4>\n\n\n\n

(4) De stof moet contact met zuren of gassen zoals chloor vermijden.<\/h4>\n\n\n\n

(5) Gebruik zacht water. Een hoge hardheid van het water zal het witmakende effect verminderen. Zuur, vrij chloor en zware metaalionen zoals koper en ijzer in het water kunnen het whitening effect aanzienlijk be\u00efnvloeden.<\/h4>\n\n\n\n

(6) Controleer de dosering van fluorescerende witmakers.<\/h4>\n\n\n\n

<\/p>\n\n\n\n

Dit artikel is geschreven door Longchang Chemical R&D Department. Als u het wilt kopi\u00ebren en herdrukken, vermeld dan de bron.<\/h4>\n\n\n\n

Hieronder volgen de fluorescerende witmakers die door ons bedrijf worden verkocht.<\/h4>\n\n\n\n
Optische witmaker OB-1<\/a><\/td>1533-45-5<\/td><\/tr>
Fluorescerende witmaker OB<\/a><\/td>7128-64-5<\/td><\/tr>
Fluorescerende witmaker ER-II<\/a><\/td>13001-38-2<\/td><\/tr>
Optische witmaker CBS-X<\/a><\/td>27344-41-8<\/td><\/tr>
Optische witmaker FP-127<\/a><\/td>40470-68-6<\/td><\/tr>
Lichtstabilisator-944<\/a><\/td>70624-18-9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

How buyers usually evaluate specialty additives in compliance-sensitive plastics<\/h2>\n

Food-contact and compliance-sensitive additive projects usually need a tighter screen than general industrial formulations. The strongest path usually combines specification review, migration thinking, and validation in the real polymer system.<\/p>\n

    \n
  • Start from the regulatory boundary:<\/strong> customer and market requirements often decide the screening route before formulation optimization begins.<\/li>\n
  • Check the polymer and processing route:<\/strong> the same additive can behave differently across resin systems, temperatures, and contact conditions.<\/li>\n
  • Review appearance together with compliance:<\/strong> visual performance still needs to be balanced against safety and documentation needs.<\/li>\n<\/ul>\n

    FAQ for buyers and formulators<\/h3>\n

    Why do compliance-sensitive plastic additives need more than a basic specification check?<\/strong>
    Because end-use exposure, migration limits, and customer requirements can change whether an additive is commercially acceptable.<\/p>\n

    Is visual effect enough to justify additive selection in food-contact plastics?<\/strong>
    Usually no. Appearance needs to be reviewed together with processing, documentation, and compliance fit.<\/p>\n","protected":false},"excerpt":{"rendered":"

    In order to improve the whiteness of the production, we want to increase the amount of whitening agent to achieve the goal, but the result is not white but yellowing<\/p>","protected":false},"author":1,"featured_media":3016,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3014","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nWhy the fluorescent whitening agent looks yellow and the solution - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"In order to improve the whiteness of the production, we want to increase the amount of whitening agent to achieve the goal, but the result is not white...\" \/>\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\/nl\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why the fluorescent whitening agent looks yellow and the solution - 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