{"id":6240,"date":"2023-09-19T09:19:57","date_gmt":"2023-09-19T09:19:57","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=6240"},"modified":"2026-04-28T10:42:21","modified_gmt":"2026-04-28T10:42:21","slug":"the-selection-conditions-for-coating-solvents","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/the-selection-conditions-for-coating-solvents\/","title":{"rendered":"Quais s\u00e3o as condi\u00e7\u00f5es de sele\u00e7\u00e3o para solventes de revestimento?"},"content":{"rendered":"<p><!-- lc-qa-start --><\/p>\n<p><strong>Resposta r\u00e1pida:<\/strong> A practical coating formulation choice starts with the application environment, then checks film formation, adhesion, appearance, and process stability under real production conditions.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<p>Quais s\u00e3o as condi\u00e7\u00f5es de sele\u00e7\u00e3o para solventes de revestimento?<\/p>\n<p>Na limpeza por fase de vapor, a pe\u00e7a de trabalho \u00e9 lavada, enxaguada e seca na camada de vapor do solvente, e a pe\u00e7a de trabalho n\u00e3o est\u00e1 sujeita a contamina\u00e7\u00e3o secund\u00e1ria, de modo que \u00e9 poss\u00edvel obter um alto grau de limpeza. No entanto, se mal gerenciado e operado de forma inadequada, o problema da perda excessiva de solvente ocorre com frequ\u00eancia, aumentando o custo de uso. A seguir, a perda de solvente \u00e9 excessiva (especialmente solventes de baixo ponto de ebuli\u00e7\u00e3o) para fazer uma an\u00e1lise dos motivos e apresentar v\u00e1rias solu\u00e7\u00f5es<br \/>\n(1) a posi\u00e7\u00e3o da m\u00e1quina de lavar n\u00e3o \u00e9 adequada, h\u00e1 forte convec\u00e7\u00e3o de ar, resultando em volatiliza\u00e7\u00e3o excessiva do solvente<br \/>\nSolu\u00e7\u00e3o: Deve-se evitar colocar a m\u00e1quina de limpeza no v\u00e3o da porta, na janela e em outros locais onde haja vento penetrante, bem como em ventiladores el\u00e9tricos e sa\u00eddas de ar condicionado.<br \/>\n(2) Espa\u00e7o insuficiente na \u00e1rea livre superior do limpador (a dist\u00e2ncia da superf\u00edcie do vapor at\u00e9 a parte superior do tanque), e os vapores do solvente s\u00e3o afetados pelo fluxo de ar circundante e escapam.<br \/>\nA solu\u00e7\u00e3o \u00e9 a seguinte:<br \/>\n\u2460 Esta \u00e9 uma quest\u00e3o de projeto de estrutura de tanque, projeto de tanque, aten\u00e7\u00e3o deve ser dada \u00e0 superf\u00edcie de vapor para o topo da dist\u00e2ncia do tanque e a rela\u00e7\u00e3o de largura do tanque deve ser maior do que 75%, o uso de ponto de ebuli\u00e7\u00e3o baixo, solventes vol\u00e1teis e solvente HFC-4310 mais caro, a rela\u00e7\u00e3o deve ser aumentada para 1,2 ~ 2,0; a localiza\u00e7\u00e3o da superf\u00edcie de vapor pode ser do meio da bobina de condensa\u00e7\u00e3o ou ligeiramente abaixo da posi\u00e7\u00e3o da bobina de condensa\u00e7\u00e3o a considerar.<br \/>\n\u2461 tamb\u00e9m pode ser usado com tubo de condensa\u00e7\u00e3o duplo, temperatura de condensa\u00e7\u00e3o dupla, o controle de temperatura do tubo de condensa\u00e7\u00e3o superior em -29OC, a temperatura da bobina de condensa\u00e7\u00e3o de trabalho inferior pode ser controlada em cerca de 4 OC.<br \/>\n(3) A largura do tanque de limpeza n\u00e3o deve ser muito grande.<br \/>\n(3) A superf\u00edcie de vapor \u00e9 muito alta, a capacidade de condensa\u00e7\u00e3o \u00e9 insuficiente, o que faz com que muito vapor de solvente escape.<br \/>\nA solu\u00e7\u00e3o \u00e9 a seguinte:<br \/>\nVerifique se o sistema de refrigera\u00e7\u00e3o est\u00e1 funcionando corretamente e solucione os problemas em tempo h\u00e1bil.<br \/>\n\u2461 como o resfriamento a \u00e1gua, verifique a temperatura da \u00e1gua de resfriamento na sa\u00edda, o ponto de ebuli\u00e7\u00e3o de 45 a 50 OC entre o solvente, a temperatura da \u00e1gua no dreno deve ser controlada em n\u00e3o mais que 21 OC; o ponto de ebuli\u00e7\u00e3o de 45 OC abaixo do solvente, a temperatura da \u00e1gua no dreno deve ser controlada em n\u00e3o mais que 16 OC.<br \/>\n(4) a superf\u00edcie de vapor est\u00e1 fora de controle, um grande n\u00famero de vapor de solvente escapa<br \/>\nA solu\u00e7\u00e3o \u00e9 a seguinte:<br \/>\nEm opera\u00e7\u00e3o normal, a superf\u00edcie do vapor deve ser controlada no meio da serpentina de condensa\u00e7\u00e3o ou um pouco abaixo, podendo ser controlada ajustando a temperatura do vapor do refrigerador ou ajustando a temperatura e o fluxo da \u00e1gua de resfriamento.<br \/>\nVerifique o dispositivo de prote\u00e7\u00e3o de temperatura do equipamento, quando a superf\u00edcie de vapor estiver muito alta (como falha do sistema de refrigera\u00e7\u00e3o), deve ser capaz de cortar automaticamente a fonte de alimenta\u00e7\u00e3o e interromper o aquecimento.<br \/>\n(5) coloca\u00e7\u00e3o inadequada de pe\u00e7as de trabalho, solventes com a pe\u00e7a de trabalho para fora<br \/>\nSolu\u00e7\u00e3o: a limpeza da pe\u00e7a de trabalho deve ser feita com o c\u00f4ncavo para baixo, de modo que o solvente possa maximizar o fluxo de sa\u00edda e n\u00e3o o ac\u00famulo no c\u00f4ncavo.<br \/>\n(6) a pe\u00e7a de trabalho no tanque est\u00e1 se movendo muito r\u00e1pido, de modo que o vapor do solvente escapa<br \/>\nSolu\u00e7\u00e3o: a pe\u00e7a de trabalho no tanque de limpeza pode se mover para cima e para baixo ou para a esquerda e para a direita; a velocidade n\u00e3o pode ser muito r\u00e1pida, deve manter a estabilidade da camada de vapor; a velocidade geral do movimento da pe\u00e7a de trabalho deve ser inferior a 50 mm\/s.<br \/>\n(7) A altura da camada de vapor \u00e9 insuficiente ou o tempo de secagem \u00e9 insuficiente, de modo que o solvente \u00e9 expelido pela pe\u00e7a de trabalho.<br \/>\nAs solu\u00e7\u00f5es s\u00e3o as seguintes:<br \/>\nA camada de vapor deve ser alta o suficiente para que a pe\u00e7a de trabalho no movimento do corpo da ranhura n\u00e3o revele a camada de vapor.<br \/>\n\u2461 enx\u00e1gue da pe\u00e7a de trabalho na camada de vapor para manter o tempo de perman\u00eancia, n\u00e3o deve haver mais condensa\u00e7\u00e3o na superf\u00edcie sem gotejamento de solvente antes do final da pe\u00e7a de trabalho para deixar a superf\u00edcie de vapor, na \u00e1rea de secagem por congelamento e, em seguida, fazer uma curta perman\u00eancia para secar completamente.<br \/>\n(8) enx\u00e1gue inadequado do spray, aumentando a perda de respingos de solvente.<br \/>\nAs solu\u00e7\u00f5es s\u00e3o as seguintes:<br \/>\n\u2460 Limpeza por pulveriza\u00e7\u00e3o, a posi\u00e7\u00e3o da pistola deve ser mais baixa do que a superf\u00edcie do vapor, 150 mm, e deve ser pulverizada para baixo.<br \/>\n\u2461 a press\u00e3o de pulveriza\u00e7\u00e3o n\u00e3o deve ser muito alta, geralmente inferior a 0,1 MPa; pulverizar o fluxo de l\u00edquido, para que a ducha de fluxo de linha fina multifilamentar seja melhor, a pulveriza\u00e7\u00e3o aumentar\u00e1 a perda por respingos.<br \/>\n(3) na aus\u00eancia da forma\u00e7\u00e3o de uma superf\u00edcie de vapor est\u00e1vel, n\u00e3o h\u00e1 lavagem por pulveriza\u00e7\u00e3o.<br \/>\n(9) Procedimentos de opera\u00e7\u00e3o inadequados, aumentando a evapora\u00e7\u00e3o da perda de solvente<br \/>\nA solu\u00e7\u00e3o \u00e9 a seguinte:<br \/>\n\u2460 tanque de limpeza antes do aquecimento, deve ser conectado \u00e0 \u00e1gua de resfriamento ou ligar o resfriador primeiro.<br \/>\n\u2461 o trabalho estiver conclu\u00eddo, desligue o aquecedor primeiro, mas a \u00e1gua de resfriamento n\u00e3o para ou o resfriador n\u00e3o para at\u00e9 que a camada de vapor desapare\u00e7a completamente, a temperatura do solvente esteja pr\u00f3xima da temperatura ambiente e, em seguida, pare a \u00e1gua ou feche a tampa.<br \/>\n\u2462 controle de baixa temperatura do solvente na m\u00e1quina de limpeza, mantenha a temperatura do solvente mais baixa do que a temperatura ambiente ao redor, a fim de reduzir a evapora\u00e7\u00e3o dos solventes para parar de funcionar quando houver perda.<br \/>\n(10) Uso e armazenamento inadequados, resultando em perda do solvente<br \/>\nA solu\u00e7\u00e3o \u00e9 a seguinte:<br \/>\n\u2460 quando a m\u00e1quina de lavar n\u00e3o estiver em uso, deve ser coberta e vedada;<br \/>\n\u2461 A longo prazo, quando n\u00e3o estiver em uso, o solvente deve ser liberado e armazenado em um barril fechado;<br \/>\n\u2462 A m\u00e1quina de limpeza deve ter uma pessoa respons\u00e1vel pela manuten\u00e7\u00e3o; as juntas dos tubos, as bombas, as v\u00e1lvulas de descarga, os filtros etc. devem ser verificados com frequ\u00eancia quanto a vazamentos.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>How buyers usually evaluate coating and paint topics<\/h2>\n<p>In conventional coating work, technical buyers usually move fastest when they define the film-performance target first and then review rheology, substrate compatibility, additives, and long-term durability as one system instead of isolated tweaks.<\/p>\n<ul>\n<li><strong>Start from the application scenario:<\/strong> furniture, powder coating, industrial paint, and waterborne systems often reward different formulation priorities.<\/li>\n<li><strong>Check surface quality and process stability together:<\/strong> leveling, wetting, foam control, and drying often interact strongly.<\/li>\n<li><strong>Review the film after full cure or drying:<\/strong> adhesion, hardness, weatherability, and color stability usually decide the commercial result.<\/li>\n<li><strong>Use targeted additive screening:<\/strong> wetting, leveling, defoaming, and wear-resistance additives work best when the defect is clearly defined.<\/li>\n<\/ul>\n<h3>Refer\u00eancias de produtos recomendadas<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiaf-094\/\">CHLUMIAF 094<\/a>:<\/strong> Um antiespumante balanceado de refer\u00eancia para revestimentos \u00e0 base de \u00e1gua e muitas telas de controle de espuma de uso geral.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiaf-3062\/\">CHLUMIAF 3062<\/a>:<\/strong> Useful when printing-ink and UV-ink compatibility matter in the defoaming screen.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiaf-3037\/\">CHLUMIAF 3037<\/a>:<\/strong> Uma op\u00e7\u00e3o antiespumante mais forte para espumas persistentes que sobrevivem a condi\u00e7\u00f5es mais severas.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiwe-3280\/\">CHLUMIWE 3280<\/a>:<\/strong> Um referente forte de agente molhante para tintas, revestimentos e molhagem de substratos dif\u00edceis.<\/li>\n<\/ul>\n<h3>FAQ para compradores e formuladores<\/h3>\n<p><strong>Why can a coating with good initial appearance still fail later?<\/strong><br \/>Because many failures show up only after full cure, storage, or service exposure, when adhesion, flexibility, or weatherability becomes the limiting factor.<\/p>\n<p><strong>Should coating additives be chosen one by one outside the full formula?<\/strong><br \/>It is usually safer to screen them inside the real formula because resin choice, pigments, and the rest of the additive package can change the result.<\/p>\n<p><!-- lc-commercial-end --><\/p>","protected":false},"excerpt":{"rendered":"<p>Vapor phase cleaning, the workpiece is washed, rinsed and dried in the solvent vapor layer, and the workpiece is not subject to secondary contamination, so a high degree of cleanliness<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[151],"tags":[],"class_list":["post-6240","post","type-post","status-publish","format-standard","hentry","category-pharmaceutical-intermediates"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What are the selection conditions for coating solvents? - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"Vapor phase cleaning, the workpiece is washed, rinsed and dried in the solvent vapor layer, and the workpiece is not subject to secondary contamination...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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