{"id":5996,"date":"2023-03-21T01:13:09","date_gmt":"2023-03-21T01:13:09","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=5996"},"modified":"2026-08-25T09:31:00","modified_gmt":"2026-08-25T09:31:00","slug":"how-to-solve-the-caking-problem-of-powder-coating","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/how-to-solve-the-caking-problem-of-powder-coating\/","title":{"rendered":"Powder Coating Caking: Causes, Prevention & Storage"},"content":{"rendered":"

Resposta r\u00e1pida:<\/strong> Powder-coating caking usually reflects a combination of temperature, time, pressure, humidity, particle-size distribution and formulation softening. Storage and handling conditions should be verified before changing the additive package.<\/p>\n

 <\/p>\n

Os revestimentos em p\u00f3 t\u00eam a tend\u00eancia de endurecer em uma determinada temperatura, o que se deve principalmente ao amolecimento da resina, do agente de nivelamento e de outros materiais no revestimento em p\u00f3 quando eles se aquecem.<\/p>\n

As resinas dos revestimentos em p\u00f3 termoendurec\u00edveis como principais materiais formadores de filme s\u00e3o pol\u00edmeros org\u00e2nicos com baixo peso molecular.<\/p>\n

 <\/p>\n

Essas resinas t\u00eam uma propriedade f\u00edsica: em uma temperatura mais baixa, \u00e9 um estado v\u00edtreo duro e quebradi\u00e7o; quando a temperatura aumenta at\u00e9 certo grau, a resina come\u00e7a a se transformar em uma certa elasticidade e produz um estado de ades\u00e3o; abaixo dessa temperatura, a resina retorna ao estado v\u00edtreo n\u00e3o adesivo; o estado v\u00edtreo da resina e o estado viscoel\u00e1stico da temperatura de transforma\u00e7\u00e3o m\u00fatua s\u00e3o chamados de temperatura de transi\u00e7\u00e3o v\u00edtrea da resina.<\/p>\n

 <\/p>\n

Diferentes resinas t\u00eam diferentes temperaturas de transi\u00e7\u00e3o v\u00edtrea, a temperatura de transi\u00e7\u00e3o v\u00edtrea da resina ep\u00f3xi e da resina de poli\u00e9ster \u00e9 de cerca de 50 graus Celsius, a temperatura de transi\u00e7\u00e3o v\u00edtrea do agente de nivelamento \u200d-l\u00edquido \u00e9 inferior a zero grau Celsius.<\/p>\n

 <\/p>\n

Quanto maior for a quantidade de material com baixa temperatura de transi\u00e7\u00e3o v\u00edtrea adicionado \u00e0 formula\u00e7\u00e3o do revestimento em p\u00f3, menor ser\u00e1 a temperatura de transi\u00e7\u00e3o v\u00edtrea do sistema. A temperatura de transi\u00e7\u00e3o v\u00edtrea do sistema de p\u00f3 \u00e9 posicionada em aproximadamente 40 graus Celsius no momento da produ\u00e7\u00e3o, e essa temperatura \u00e9 definida como uma temperatura segura para a aglomera\u00e7\u00e3o do revestimento em p\u00f3. \u200d<\/p>\n

O aumento da temperatura facilitar\u00e1 a aglomera\u00e7\u00e3o dos produtos de revestimento em p\u00f3, portanto, como podemos evitar a aglomera\u00e7\u00e3o do revestimento em p\u00f3 em nosso trabalho?<\/p>\n

Em primeiro lugar, temos que estabelecer um conceito que<\/p>\n

 <\/p>\n

O endurecimento do revestimento em p\u00f3 em uma determinada temperatura \u00e9 uma lei natural. Para evitar a aglomera\u00e7\u00e3o do revestimento em p\u00f3, \u00e9 necess\u00e1rio que todo o processo de produ\u00e7\u00e3o do revestimento em p\u00f3, como moagem, embalagem, armazenamento e transporte, os produtos de revestimento em p\u00f3 estejam abaixo da temperatura de transi\u00e7\u00e3o v\u00edtrea. \u200d<\/p>\n

Com base nessa vis\u00e3o, as seguintes solu\u00e7\u00f5es est\u00e3o dispon\u00edveis.<\/p>\n

 <\/p>\n

1) Na produ\u00e7\u00e3o de resina de poli\u00e9ster, escolha alguns \u00e1lcoois ou \u00e1cidos que possam aumentar sua temperatura de transi\u00e7\u00e3o v\u00edtrea ou reduza a quantidade de \u00e1lcoois que possam diminuir a temperatura de transi\u00e7\u00e3o v\u00edtrea da resina para aumentar a temperatura de transi\u00e7\u00e3o v\u00edtrea da resina de poli\u00e9ster.<\/p>\n

(2) Reduzir a quantidade de pol\u00edmero de baixa temperatura de transi\u00e7\u00e3o v\u00edtrea usado no projeto da formula\u00e7\u00e3o do revestimento em p\u00f3, como agente de nivelamento e agente clareador, para garantir que a temperatura de transi\u00e7\u00e3o v\u00edtrea do sistema de revestimento em p\u00f3 n\u00e3o seja reduzida.<\/p>\n

(3) Na produ\u00e7\u00e3o, os fragmentos quebrados da correia de a\u00e7o devem ser resfriados o suficiente antes de entrar no processo de moagem, e a velocidade de alimenta\u00e7\u00e3o deve ser reduzida, o volume de ar induzido deve ser aumentado e o ar de entrada deve ser equipado com um condicionador de ar frio para controlar a temperatura de moagem. No entanto, se a moagem for feita antes do resfriamento dos peda\u00e7os de material triturado, os \u00faltimos meios n\u00e3o desempenhar\u00e3o um bom papel, considere o m\u00e9todo de resfriamento for\u00e7ado de material de detritos quebrados para tratamento de baixa temperatura, que \u00e9 mais eficaz do que a adi\u00e7\u00e3o de ar condicionado. \u200d<\/p>\n

O ver\u00e3o est\u00e1 chegando, e os revestimentos em p\u00f3 geralmente apresentam aglomerados de p\u00f3 e at\u00e9 mesmo grumos quando est\u00e3o em uso. Isso se deve \u00e0 alta temperatura ambiente e \u00e0 umidade durante a produ\u00e7\u00e3o, o armazenamento e o transporte, e a temperatura de transi\u00e7\u00e3o v\u00edtrea dos revestimentos em p\u00f3 \u00e9 superior a 40 graus. Para evitar que o revestimento em p\u00f3 se aglomere durante o processo de aplica\u00e7\u00e3o, os seguintes aspectos devem ser observados.<\/p>\n

1. Ao escolher a resina, use uma resina com alta temperatura de transi\u00e7\u00e3o v\u00edtrea (TG). A temperatura de transi\u00e7\u00e3o v\u00edtrea da resina ep\u00f3xi convencional e da resina de poli\u00e9ster \u00e9 de cerca de 50\u00b0C, o que pode atender \u00e0 demanda geral. Quando os requisitos de armazenamento s\u00e3o altos, a resina sint\u00e9tica pode reduzir o uso de \u00e1lcoois que reduzir\u00e3o a temperatura de transi\u00e7\u00e3o v\u00edtrea da resina, curando a cura de amina alic\u00edclica dispon\u00edvel para ep\u00f3xi.<\/p>\n

2. No projeto da formula\u00e7\u00e3o do revestimento em p\u00f3, para reduzir o uso de pol\u00edmeros de baixa temperatura de transi\u00e7\u00e3o v\u00edtrea, como o agente de nivelamento, a temperatura de transi\u00e7\u00e3o v\u00edtrea \u00e9 de cerca de 30 \u2103, voc\u00ea pode adicionar um pouco menos. A adi\u00e7\u00e3o de plastificante reduzir\u00e1 o grupo r\u00edgido da resina e diminuir\u00e1 o TG da resina, e a adi\u00e7\u00e3o de TGIC excessivo tamb\u00e9m diminuir\u00e1 o TG da resina.<\/p>\n

3. Os aditivos auxiliares incluem agente de fluxo de p\u00f3 seco e agente antiaglomerante adicional, negro de fumo branco. O principal componente do agente de fluxo de p\u00f3 seco \u00e9 algum material org\u00e2nico em p\u00f3 de cera para antiader\u00eancia. O agente antiaglomerante pertence principalmente \u00e0 classe de silicato de subst\u00e2ncias inorg\u00e2nicas, e a folha \u00e9 triturada juntamente com o uso de peneira, podendo desempenhar um papel na preven\u00e7\u00e3o da aglomera\u00e7\u00e3o da ades\u00e3o do p\u00f3. A adi\u00e7\u00e3o de s\u00edlica \u00e9 principalmente pirog\u00eanica, com gravidade espec\u00edfica leve e f\u00e1cil de absorver umidade. Portanto, ao usar para dispersar bem, evite a umidade, e a cor escura n\u00e3o ter\u00e1 manchas brancas.<\/p>\n

4. O processo de produ\u00e7\u00e3o controla principalmente a extrus\u00e3o e a moagem de dois elos. Durante a extrus\u00e3o, o resfriamento f\u00edsico da pista longa e do ventilador pode reduzir efetivamente a temperatura dos flocos e, quando os flocos s\u00e3o resfriados, \u00e9 feita a moagem. Na moagem de p\u00f3, a velocidade de alimenta\u00e7\u00e3o pode ser reduzida e a quantidade de ar induzido pode ser aumentada adequadamente, e um resfriador pode ser adicionado \u00e0 entrada de ar para reduzir a temperatura na tubula\u00e7\u00e3o, se necess\u00e1rio. O p\u00f3 de moagem deve ser resfriado a uma temperatura abaixo da temperatura ambiente antes de ser embalado. Algumas f\u00e1bricas de p\u00f3 ter\u00e3o uma caixa de p\u00f3 com duas embalagens separadas por sacos internos, mas tamb\u00e9m para evitar o ac\u00famulo de p\u00f3 e, at\u00e9 certo ponto, para evitar a aglomera\u00e7\u00e3o de p\u00f3.<\/p>\n

5. O p\u00f3 deve ser armazenado em uma oficina seca e \u00e0 prova de luz. Alguns produtos de alto brilho e flores flutuantes que se endurecem facilmente precisam ser armazenados em armaz\u00e9ns com ar-condicionado ou envoltos em uma camada de papel-alum\u00ednio ao redor do isolamento do produto. O transporte deve ser feito em ve\u00edculos com ar-condicionado ou em caminh\u00f5es cobertos com tela de prote\u00e7\u00e3o, e n\u00e3o em caminh\u00f5es-ba\u00fa, e deve evitar o ac\u00famulo de objetos pesados.<\/p>\n

Conclus\u00e3o: o fato de as mat\u00e9rias-primas em p\u00f3 se aglomerarem facilmente em altas temperaturas \u00e9 um processo natural, n\u00e3o necessariamente um indicador da avalia\u00e7\u00e3o de mat\u00e9rias-primas boas ou ruins. Al\u00e9m do antiaglomerante de alta temperatura, a preven\u00e7\u00e3o de inc\u00eandios e de desastres deve ser importante, assim como a oficina para parar de fumar, proibir o carregamento de carros el\u00e9tricos, a exposi\u00e7\u00e3o de fios de equipamentos, etc., s\u00e3o pequenas neglig\u00eancias causadas por grandes problemas.<\/p>\n

A maneira de lidar com o endurecimento do revestimento em p\u00f3.
\n1. Na produ\u00e7\u00e3o de resina de poli\u00e9ster, escolha algum \u00e1lcool ou \u00e1cido que possa melhorar sua temperatura de transi\u00e7\u00e3o v\u00edtrea ou reduza a quantidade de \u00e1lcool que possa reduzir a temperatura de transi\u00e7\u00e3o v\u00edtrea da resina para melhorar a temperatura de transi\u00e7\u00e3o v\u00edtrea da resina de poli\u00e9ster.
\n2. No planejamento de formula\u00e7\u00f5es de revestimento em p\u00f3, reduza a quantidade de pol\u00edmeros de baixa temperatura de transi\u00e7\u00e3o v\u00edtrea, como agentes de nivelamento e agentes de face longa, para garantir que a temperatura de transi\u00e7\u00e3o v\u00edtrea do sistema de revestimento n\u00e3o caia.
\n3. Em termos de produ\u00e7\u00e3o, os fragmentos quebrados devem ser resfriados o suficiente antes de entrar no processo de moagem, e a velocidade de moagem deve ser reduzida e o volume de ar deve ser aumentado para controlar a temperatura de moagem.<\/p>\n

Entre em contato conosco agora!<\/b><\/strong><\/h2>\n

Se precisar de COA, MSDS ou TDS de mon\u00f4meros UV, preencha suas informa\u00e7\u00f5es de contato no formul\u00e1rio abaixo. Em geral, entraremos em contato em 24 horas. Voc\u00ea tamb\u00e9m pode me enviar um e-mail info@longchangchemical.com<\/a><\/span> durante o hor\u00e1rio comercial (das 8h30 \u00e0s 18h UTC+8 de segunda a s\u00e1bado) ou use o bate-papo ao vivo do site para obter uma resposta imediata.<\/b><\/strong><\/h4>","protected":false},"excerpt":{"rendered":"

Powder coatings have the tendency to caking at a certain temperature, which is mainly due to the softening of the resin, leveling agent and other materials in the powder coating<\/p>","protected":false},"author":1,"featured_media":5998,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143],"tags":[],"class_list":["post-5996","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uv-light-curing-series"],"yoast_head":"\nPowder Coating Caking: Causes, Prevention & Storage<\/title>\n<meta name=\"description\" content=\"Prevent powder-coating caking by controlling storage temperature, humidity, particle size, resin softening, packaging, handling and reclaim conditions.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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