{"id":4885,"date":"2021-12-08T12:34:41","date_gmt":"2021-12-08T12:34:41","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=4885"},"modified":"2026-04-28T10:41:52","modified_gmt":"2026-04-28T10:41:52","slug":"cpba-and-dmf-no-together","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/cpba-and-dmf-no-together\/","title":{"rendered":"H\u00e1 um risco de explos\u00e3o quando o m-CPBA e o DMF reagem juntos"},"content":{"rendered":"<!-- lc-qa-start -->\n<p><strong>Resposta r\u00e1pida:<\/strong> Surface-control additives are usually selected by defect type, compatibility, and dosage window. The strongest commercial choice is the one that fixes the real problem without creating a new one.<\/p>\n<!-- lc-qa-end -->\n\n\n<p>O DMF \u00e9 um dos solventes mais usados em s\u00edntese org\u00e2nica e tamb\u00e9m \u00e9 conhecido como solvente universal. Hoje compartilharei com voc\u00eas um caso de rea\u00e7\u00e3o. O uso combinado de m-CPBA e DMF tamb\u00e9m \u00e9 potencialmente perigoso. O m-CPBA, tamb\u00e9m conhecido como \u00e1cido m-cloroperoxibenz\u00f3ico, \u00e9 um tipo de oxidante org\u00e2nico muito usado em qu\u00edmica org\u00e2nica. Em termos relativos, ele \u00e9 relativamente seguro. No entanto, o campo da qu\u00edmica \u00e9 repleto de inc\u00f3gnitas. Um acidente relatado na literatura compartilhada hoje est\u00e1 relacionado ao uso misto de m-CPBA e DMF, e est\u00e1 diretamente relacionado \u00e0s seguintes transforma\u00e7\u00f5es qu\u00edmicas.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"387\" height=\"92\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/1.jpg\" alt=\"\" class=\"wp-image-4886\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/1.jpg 387w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/1-300x71.jpg 300w\" sizes=\"(max-width: 387px) 100vw, 387px\" \/><\/figure>\n\n\n\n<p>Sintetizadores da Fujisawa Pharmaceutical Company no Jap\u00e3o usaram o m-CPBA para oxidar o enxofre em sulf\u00f3xido usando DMF como solvente em escala piloto. Os sintetizadores primeiro misturaram 6,3 litros de DMF e 11,0 kg de m-CPBA e agitaram os dois por 2 horas. Em seguida, filtrou-se para obter uma solu\u00e7\u00e3o l\u00edmpida, e a solu\u00e7\u00e3o l\u00edmpida foi adicionada \u00e0 solu\u00e7\u00e3o de rea\u00e7\u00e3o org\u00e2nica. Quando o processo de gotejamento \u00e9 realizado por 1 hora, a solu\u00e7\u00e3o DMF de m-CPBA aumenta repentinamente e o g\u00e1s \u00e9 liberado. E, de repente, explodiu. O autor deste artigo (Org. Proc. Res. Dev.) descreve resumidamente o processo de rea\u00e7\u00e3o conforme a figura a seguir.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"392\" height=\"119\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/2.jpg\" alt=\"\" class=\"wp-image-4887\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/2.jpg 392w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/2-300x91.jpg 300w\" sizes=\"(max-width: 392px) 100vw, 392px\" \/><\/figure>\n\n\n\n<p>A equipe sint\u00e9tica imediatamente procurou a causa do acidente e da explos\u00e3o. Eles especularam que provavelmente o acidente foi causado por mat\u00e9ria insol\u00favel, e a mat\u00e9ria insol\u00favel era exatamente o m-CBPO. Essa mat\u00e9ria insol\u00favel pode ser uma impureza da pr\u00f3pria mat\u00e9ria-prima m-CPBA ou pode ser gerada gradualmente no sistema de rea\u00e7\u00e3o. O autor deste artigo conduziu uma s\u00e9rie de experimentos de verifica\u00e7\u00e3o. O autor descobriu que o conte\u00fado de m-CBPO na mat\u00e9ria-prima m-CPBA \u00e9 de apenas 0,2%. Al\u00e9m disso, os experimentos de DTA e IST confirmaram que o m-CPBA derrete a 89 graus e \u00e9 est\u00e1vel a menos de 97 graus. O autor ent\u00e3o realizou um estudo de DTA na solu\u00e7\u00e3o DMF de m-CPBA, e os resultados mostraram que a temperatura de decomposi\u00e7\u00e3o do m-CPBA era de 83 graus. Os experimentos acima mostram que o DMF pode afetar amplamente o ponto cr\u00edtico da temperatura de decomposi\u00e7\u00e3o do m-CPBA. Portanto, o autor acredita que o solvente DMF desempenhou um papel importante nesse acidente.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/3-1.jpg\" alt=\"\" class=\"wp-image-4889\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"472\" height=\"422\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/4.jpg\" alt=\"\" class=\"wp-image-4890\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/4.jpg 472w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/4-300x268.jpg 300w\" sizes=\"(max-width: 472px) 100vw, 472px\" \/><\/figure>\n\n\n\n<p>O autor descobriu ent\u00e3o que, \u00e0 medida que a temperatura aumentava, o conte\u00fado de m-CBPO aumentava significativamente, e a pesquisa de DTA mostrou que, quando a temperatura atinge mais de 125 graus, pode-se prever uma explos\u00e3o muito s\u00e9ria.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"452\" height=\"311\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/5.jpg\" alt=\"\" class=\"wp-image-4891\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/5.jpg 452w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/5-300x206.jpg 300w\" sizes=\"(max-width: 452px) 100vw, 452px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"466\" height=\"408\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/6.jpg\" alt=\"\" class=\"wp-image-4893\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/6.jpg 466w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/6-300x263.jpg 300w\" sizes=\"(max-width: 466px) 100vw, 466px\" \/><\/figure>\n\n\n\n<p>Em seguida, o autor realizou um estudo de ARC da solu\u00e7\u00e3o DMF de m-CPBA, um estudo de concentra\u00e7\u00e3o e um estudo de estabilidade mista de m-CPBA e m-CPBO. A conclus\u00e3o final \u00e9 que s\u00e3o necess\u00e1rios 185 minutos para que a solu\u00e7\u00e3o DMF de m-CPBA aumente lentamente de 26 graus para 70 graus e, em seguida, aumente rapidamente para 200 graus em alguns minutos ou algo semelhante. Al\u00e9m disso, a solu\u00e7\u00e3o DMF de m-CPBA mais concentrada se aquece mais rapidamente. O experimento misto de m-CPBA e m-CPBO mostra que a temperatura aumenta lentamente no in\u00edcio, mas depois de apenas 95 minutos, haver\u00e1 um aumento acentuado da temperatura.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"494\" height=\"891\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/7.jpg\" alt=\"\" class=\"wp-image-4895\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/7.jpg 494w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/7-166x300.jpg 166w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/figure>\n\n\n\n<p>Em resumo, o autor deste artigo apresenta o processo geral da explos\u00e3o. Primeiro, a forma\u00e7\u00e3o de m-CPBO leva a um aumento na temperatura e, em seguida, a forma\u00e7\u00e3o de uma grande quantidade de m-CPBO causa uma explos\u00e3o em altas temperaturas. No final, o autor usou diclorometano DCM como solvente para resolver esse problema com sucesso. Os experimentos de DTA mostram que, usando o diclorometano como solvente, n\u00e3o h\u00e1 exotermia ao longo do tempo.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"466\" height=\"312\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/10-1.jpg\" alt=\"\" class=\"wp-image-4896\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/10-1.jpg 466w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/12\/10-1-300x201.jpg 300w\" sizes=\"(max-width: 466px) 100vw, 466px\" \/><\/figure>\n\n\n\n<p>Fa\u00e7a experimentos com dezenas de milhares de pessoas, primeiro a seguran\u00e7a! <strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/dimethyl-sulfoxide-cas-67-68-5\/\" target=\"_blank\" rel=\"noreferrer noopener\">DMSO<\/a><\/strong> e DMF s\u00e3o solventes fortemente polares, embora tenham boa solubilidade para org\u00e2nicos, eles tamb\u00e9m s\u00e3o uma faca de dois gumes!<\/p>\n\n\n<!-- lc-commercial-start -->\n<h2>How buyers usually evaluate coating and ink additives<\/h2>\n<p>A sele\u00e7\u00e3o aditiva \u00e9 geralmente mais eficaz quando a equipe define o defeito primeiro e, em seguida, avalia a compatibilidade, a faixa de dosagem e a etapa do processo. Isso \u00e9 muitas vezes muito mais confi\u00e1vel do que escolher apenas pela fam\u00edlia qu\u00edmica ou por um \u00fanico resultado laboratorial dram\u00e1tico.<\/p>\n<ul>\n<li><strong>Comece pelo defeito, n\u00e3o pelo nome do aditivo:<\/strong> Perda por umedecimento, cratera, microespuma e instabilidade frequentemente precisam de solu\u00e7\u00f5es diferentes, mesmo dentro da mesma f\u00f3rmula.<\/li>\n<li><strong>Verifique a compatibilidade na dosagem pretendida:<\/strong> o aditivo mais forte ainda pode ser a escolha comercial errada se ele estreitar demais a janela de processo.<\/li>\n<li><strong>Revise o est\u00e1gio de uso:<\/strong> alguns produtos s\u00e3o mais \u00fateis durante a moagem, enquanto outros importam mais na dilui\u00e7\u00e3o, no enchimento ou na aplica\u00e7\u00e3o final.<\/li>\n<li><strong>Equilibre cura ou qualidade do filme com controle de defeitos:<\/strong> o aditivo certo resolve o problema sem sacrificar a ader\u00eancia, o brilho ou a apar\u00eancia.<\/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>Por que um aditivo que parece poderoso em um b\u00e9quer \u00e0s vezes falha na produ\u00e7\u00e3o?<\/strong><br \/>Porque cisalhamento, temperatura, substrato e a f\u00f3rmula completa podem alterar a maneira como o aditivo se comporta sob condi\u00e7\u00f5es reais de processamento.<\/p>\n<p><strong>O aditivo mais agressivo deve ser sempre preferido?<\/strong><br \/>Geralmente n\u00e3o. O melhor aditivo \u00e9 aquele que resolve o defeito real, mantendo a mais ampla janela de opera\u00e7\u00e3o segura.<\/p>\n<!-- lc-commercial-end -->","protected":false},"excerpt":{"rendered":"<p>DMF is one of the most widely used solvents in organic synthesis, and is also known as a universal solvent. Today I will share a reaction case with you. The<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[],"class_list":["post-4885","post","type-post","status-publish","format-standard","hentry","category-laboratory-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>There is a risk of explosion when m-CPBA and DMF react together - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"DMF is one of the most widely used solvents in organic synthesis, and is also known as a universal solvent. 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