{"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\/pt\/why-the-fluorescent-whitening-agent-looks-yellow-and-the-solution\/","title":{"rendered":"Por que o agente de clareamento fluorescente parece amarelo e a solu\u00e7\u00e3o"},"content":{"rendered":"\n

Resposta r\u00e1pida:<\/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

Para melhorar a brancura da produ\u00e7\u00e3o, queremos aumentar a quantidade de agente de branqueamento para atingir a meta, mas o resultado n\u00e3o \u00e9 branco, e sim um tecido amarelado. Ao verificar os dados e analisar os motivos, ap\u00f3s muitos experimentos, encontramos o ponto de amarelamento e a solu\u00e7\u00e3o.<\/h4>\n\n\n\n\n

1\u3001 Princ\u00edpio do agente de clareamento fluorescente<\/strong><\/h2>\n\n\n\n

Existem variedades de agentes de clareamento fluorescentes, o clareamento de v\u00e1rias fibras precisa de diferentes marcas de agentes de clareamento, embora a estrutura qu\u00edmica e as propriedades de v\u00e1rios agentes de clareamento sejam diferentes, mas o princ\u00edpio de clareamento da fibra ou do tecido \u00e9 o mesmo. O princ\u00edpio do branqueamento se deve principalmente \u00e0s mol\u00e9culas do branqueador que cont\u00eam um total de sistema de liga\u00e7\u00e3o dupla conjugada, boa planicidade, a estrutura molecular especial sob a luz solar pode absorver a luz solar, a luz ultravioleta (comprimento de onda de 300 a 400 nm) e a luz violeta (comprimento de onda de 420 a 500 nm), ou a luz violeta e a fibra misturada com a luz amarela no tecido em uma luz branca.<\/h4>\n\n\n\n

2 \u3001 A raz\u00e3o pela qual a brancura diminui<\/strong><\/h2>\n\n\n\n

(1) Como a intensidade da luz amarela no tecido \u00e9 limitada, a luz de cor complementar - luz azul e roxa - emitida pelo agente clareador fluorescente que absorve a luz ultravioleta tamb\u00e9m \u00e9 limitada para compensar a luz amarela (o comprimento de onda principal \u00e9 de cerca de 570 nm).<\/h4>\n\n\n\n

(2) O efeito de clareamento do branqueador fluorescente \u00e9 apenas um clareamento \u00f3ptico e um complemento, e n\u00e3o pode substituir o branqueamento qu\u00edmico. Portanto, o efeito de branqueamento do branqueador fluorescente n\u00e3o \u00e9 ideal para o tecido sem branqueamento.<\/h4>\n\n\n\n

(3) De acordo com o princ\u00edpio do agente de branqueamento fluorescente, o efeito de branqueamento do agente de branqueamento depende principalmente do conte\u00fado de UV na luz solar e da concentra\u00e7\u00e3o do agente de branqueamento fluorescente na fibra ou no tecido. Quando o conte\u00fado de UV \u00e9 suficiente, a concentra\u00e7\u00e3o do agente de branqueamento fluorescente no tecido muda dentro de uma determinada faixa, e o efeito de branqueamento aumenta com o aumento da concentra\u00e7\u00e3o do agente de branqueamento no tecido, e a intensidade da luz azul violeta tamb\u00e9m aumenta, de modo a compensar alguma luz amarela no tecido, e o tecido se torna cada vez mais branco.Quando a concentra\u00e7\u00e3o do agente de branqueamento aumenta at\u00e9 uma determinada concentra\u00e7\u00e3o adequada, a intensidade da luz azul-violeta emitida por ele \u00e9 exatamente igual \u00e0 intensidade da luz amarela no tecido, que se cancelam mutuamente, e o efeito de branqueamento \u00e9 o melhor, e o valor de brancura \u00e9 o mais alto.Mas se aumentar a dosagem do agente branco al\u00e9m da concentra\u00e7\u00e3o ideal, o tecido na absor\u00e7\u00e3o dos graus de intensidade da luz violeta mais do que compensa o tecido na for\u00e7a da luz amarela, \u00e9 um agente de clareamento \u00f3bvio da luz violeta azul refletida por, ao mesmo tempo, devido ao aumento de todos os tipos de grupo de agentes brancos em diferentes grupos, diferentes tons do renderizado (como verde, roxo claro, vermelho, azul, etc.) s\u00e3o claramente mostrados, um resultado da a\u00e7\u00e3o combinada dos fatores acima, o aumento do tecido cinza, sua brancura subsequentemente diminui.<\/h4>\n\n\n\n

(4) Quando h\u00e1 \u00e1cido ou cloro gasoso nos locais de armazenamento do tecido branqueado, o teor de umidade \u00e9 alto, \u00e9 f\u00e1cil absorver \u00e1gua, pois a \u00e1gua \u00e9 l\u00edquida, sob a atra\u00e7\u00e3o molecular de grupos hidrof\u00edlicos, h\u00e1 a tend\u00eancia de que a recupera\u00e7\u00e3o da umidade da cobertura do tecido tenda a se equilibrar, raz\u00e3o pela qual o tecido amarela e se expande em peda\u00e7os, o tecido mancha por ponto e sangra nas camadas superior e inferior dos tecidos.<\/h4>\n\n\n\n

(5) A qualidade da \u00e1gua impura, a alta dureza da \u00e1gua ou os metais pesados podem afetar o efeito do clareamento.<\/h4>\n\n\n\n

3\u3001 As manchas amarelas do agente clareador<\/strong><\/h2>\n\n\n\n

A concentra\u00e7\u00e3o ideal do agente de branqueamento \u00e9 chamada de ponto de amarelamento do agente de branqueamento. Os pontos de amarelamento de v\u00e1rios branqueadores fluorescentes s\u00e3o diferentes. Por exemplo, o ponto de amarelamento do agente de branqueamento fluorescente DT (usado para poli\u00e9ster) \u00e9 0,8%, ou seja, quando a quantidade de agente de branqueamento DT excede 0,8%, seu valor de brancura diminui com o aumento da quantidade.O ponto de amarelamento do agente de branqueamento fluorescente VBL (usado para tecido de algod\u00e3o puro) foi de 0,5 %. O ponto de amarelamento do agente de branqueamento fluorescente DCB (usado para branquear fibra acr\u00edlica) foi de 0,8%. O ponto de amarelamento do agente de branqueamento fluorescente CH (usado para fio acr\u00edlico em massa) \u00e9 de 3,3 %. BlankophorBBU (l\u00edquido, produtos Bayer, para tecidos de algod\u00e3o puro) teve um ponto de amarelamento de 1,26%; Uvite ERN - P (um produto da empresa CGY usado em tecido de poli\u00e9ster) tem um ponto de amarelamento de 0,8%; Uvite EBF 250 %C polpa de produtos MCGY, usado em tecidos de poli\u00e9ster) ponto de amarelamento de 3 %.<\/h4>\n\n\n\n

4\u3001 Solu\u00e7\u00f5es<\/strong><\/h2>\n\n\n\n

(1) Uma s\u00e9rie de medidas correspondentes deve ser adotada no processo de produ\u00e7\u00e3o, como no processo de fervura e branqueamento, a lavagem ap\u00f3s a decapagem deve ser suficiente; ensaboar para minimizar o res\u00edduo de sab\u00e3o; \u00e1gua macia deve ser usada para branquear e o valor do pH deve ser alcalino (pH 8~9).O agente de branqueamento fluorescente deve escolher produtos com boa resist\u00eancia a \u00e1cidos, como Uvitex RT, CF, BT (empresa ciba -jiagi); Tinopal2B, SP (ciba -jiaggi), Leucophor B (sandex); BlankophorBBU (Bayer, inc.) etc.<\/h4>\n\n\n\n

(2) O processo tradicional \u00e9: limpeza e alvejamento - lavagem com \u00e1gua quente - \u00e1cido - desoxida\u00e7\u00e3o - lavagem com \u00e1gua. O \u00e1cido ac\u00e9tico glacial foi lavado ap\u00f3s a \u00e1gua quente. O \u00e1cido ac\u00e9tico glacial \u00e9 um \u00e1cido vol\u00e1til, de baixa permeabilidade, que s\u00f3 pode neutralizar a soda c\u00e1ustica na superf\u00edcie da fibra, sendo dif\u00edcil penetrar no interior da fibra.Portanto, o \u00e1cido neutralizante pode n\u00e3o apenas neutralizar a soda c\u00e1ustica na superf\u00edcie da fibra, mas tamb\u00e9m neutralizar a soda c\u00e1ustica no interior da fibra, de modo que o efeito da neutraliza\u00e7\u00e3o completa possa ser alcan\u00e7ado. Enquanto isso, o tempo e a temperatura do excesso de acidez devem ser estritamente controlados para que a neutraliza\u00e7\u00e3o seja completa. Portanto, o tempo de excesso de acidez deve ser alterado de 15 min para 30 min. Isso \u00e9 especialmente importante para o branqueamento de tecidos pesados com uma massa de 190 g\/m2 ou mais.<\/h4>\n\n\n\n

(3) O amaciante cati\u00f4nico, o amaciante cati\u00f4nico fraco e o \u00f3leo de silicone comum podem causar diferentes graus de amarelamento em tecidos brancos.<\/h4>\n\n\n\n

(4) O tecido deve evitar o contato com \u00e1cidos ou gases como o cloro.<\/h4>\n\n\n\n

(5) Deve-se usar \u00e1gua macia, pois a alta dureza da \u00e1gua diminui o efeito do clareamento. \u00c1cido, cloro livre e \u00edons de metais pesados, como cobre e ferro, na \u00e1gua podem afetar significativamente o efeito de clareamento.<\/h4>\n\n\n\n

(6) Controle a dosagem do agente clareador fluorescente.<\/h4>\n\n\n\n

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

Este artigo foi escrito pelo Departamento de P&D da Longchang Chemical. Se voc\u00ea precisar copiar e reimprimir, indique a fonte.<\/h4>\n\n\n\n

A seguir est\u00e3o os produtos da s\u00e9rie de branqueadores fluorescentes vendidos por nossa empresa.<\/h4>\n\n\n\n
Branqueador \u00f3ptico OB-1<\/a><\/td>1533-45-5<\/td><\/tr>
Clareador Fluorescente OB<\/a><\/td>7128-64-5<\/td><\/tr>
Clareador Fluorescente ER-II<\/a><\/td>13001-38-2<\/td><\/tr>
Branqueador \u00f3ptico CBS-X<\/a><\/td>27344-41-8<\/td><\/tr>
Branqueador \u00f3ptico FP-127<\/a><\/td>40470-68-6<\/td><\/tr>
Estabilizador de luz-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 para compradores e formuladores<\/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":"

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