{"id":3483,"date":"2021-01-18T03:24:12","date_gmt":"2021-01-18T03:24:12","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=3483"},"modified":"2026-04-28T10:41:48","modified_gmt":"2026-04-28T10:41:48","slug":"properties-and-synthetic-routes-of-allantoin","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/properties-and-synthetic-routes-of-allantoin\/","title":{"rendered":"Propriedades e rotas sint\u00e9ticas da alanto\u00edna e seus derivados"},"content":{"rendered":"<h4 class=\"wp-block-heading\">Devido \u00e0 sua ampla aplica\u00e7\u00e3o, a demanda por <strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/allantoin-cas-97-59-6\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"has-inline-color has-vivid-cyan-blue-color\">alanto\u00edna<\/span><\/a><\/strong> vem aumentando ano a ano. O m\u00e9todo de s\u00edntese qu\u00edmica da alanto\u00edna surgiu em pa\u00edses estrangeiros na d\u00e9cada de 1940. Mas foi somente no final da d\u00e9cada de 1970 e in\u00edcio da d\u00e9cada de 1980 que o Jap\u00e3o e a Alemanha Ocidental o colocaram em produ\u00e7\u00e3o industrial. O desenvolvimento da s\u00edntese nacional de alanto\u00edna come\u00e7ou relativamente tarde, e a pesquisa e o desenvolvimento tiveram in\u00edcio no final da d\u00e9cada de 1970. Atualmente, apenas algumas empresas nacionais alcan\u00e7aram a produ\u00e7\u00e3o piloto ou em massa. Como h\u00e1 poucos fabricantes, o mercado \u00e9 extremamente restrito. Devido \u00e0s propriedades f\u00edsicas e qu\u00edmicas especiais da alanto\u00edna, os derivados da alanto\u00edna t\u00eam v\u00e1rios tipos e s\u00e3o amplamente utilizados. At\u00e9 hoje, a alanto\u00edna e seus derivados ainda continuam a se desenvolver.<\/h4>\n\n<!-- lc-qa-start -->\n<p><strong>Quick answer:<\/strong> A practical additive decision starts with the exact defect: foam, poor wetting, craters, haze, or instability. The best product is usually the one that solves that defect with the safest compatibility window.<\/p>\n<!-- lc-qa-end -->\n\n\n\n\n\n\n<h4 class=\"wp-block-heading\"><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/allantoin-cas-97-59-6\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"has-inline-color has-vivid-cyan-blue-color\">Alanto\u00edna<\/span><\/a><\/strong>O nome qu\u00edmico \u00e9 1-ureia-m-diazoceno - [2,4]; acetalde\u00eddo tetraaza ciclopentadieno; (2,5-dioxoceno-4-m-diazopentil) ureia; 5-ureia hidanto\u00edna etc. Pertence ao composto heteroc\u00edclico imidazol, cuja f\u00f3rmula molecular \u00e9 C<sub>4<\/sub>H<sub>6<\/sub>N<sub>4<\/sub>O<sub>3<\/sub>O peso molecular \u00e9 de 158,12 g\/mol. A alanto\u00edna \u00e9 um cristal ou p\u00f3 cristalino cuja cor varia entre incolor e branco, e \u00e9 inodoro e ins\u00edpido. O ponto de fus\u00e3o da alanto\u00edna varia de 220 a 238 \u2103. A alanto\u00edna \u00e9 insol\u00favel em \u00e1gua, \u00e1lcool, \u00e9ter e clorof\u00f3rmio, sol\u00favel em \u00e1gua quente, etanol dilu\u00eddo e tri\u00f3is propano. A solu\u00e7\u00e3o aquosa saturada (0,6%) era ligeiramente \u00e1cida, pH = 6. Em uma solu\u00e7\u00e3o aquosa de pH = 4 a 9, ele permanece est\u00e1vel, e em um solvente n\u00e3o aquoso e ar de secagem \u00e9 est\u00e1vel, mesmo em 80 ~ 90 \u2103 30 min sob calor tamb\u00e9m permaneceu inalterado.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">Por\u00e9m, ela n\u00e3o suporta altas temperaturas (acima de 100 \u2103), uma base forte ou um longo per\u00edodo de fervura e luz solar. A alanto\u00edna tem is\u00f4meros, e a f\u00f3rmula estrutural \u00e9 a seguinte:<\/h4>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"694\" height=\"168\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/1-1.png\" alt=\"\" class=\"wp-image-3484\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/1-1.png 694w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/1-1-300x73.png 300w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/1-1-600x145.png 600w\" sizes=\"(max-width: 694px) 100vw, 694px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">O sistema conjugado de \u00e1lcool \u00e9 a raz\u00e3o para a forma\u00e7\u00e3o de grupos \u00e1cidos e pode estabilizar as mol\u00e9culas. A exist\u00eancia de OH<sup>&#8211;<\/sup>&nbsp;pode levar algumas pessoas a pensar que a alanto\u00edna \u00e9 um composto \u00e1cido bin\u00e1rio. Entretanto, de modo geral, o hidrog\u00eanio no C(4) tem uma atividade muito baixa e uma constante de dissocia\u00e7\u00e3o fraca. O \u00e1cido na posi\u00e7\u00e3o do carbono (2) \u00e9 mais forte, e a constante de dissocia\u00e7\u00e3o \u00e9 de 1,17 \u00d7 10<sup>-9<\/sup>. Portanto, somente uma \u00fanica s\u00e9rie de sais, sais \u00e1cidos ou sais b\u00e1sicos, pode ser formada. Portanto, a alanto\u00edna \u00e9 um composto anfot\u00e9rico \u00e1cido-base monob\u00e1sico. Podem existir as formas de \u00e1lcool e cetona. Como um composto anfot\u00e9rico, a alanto\u00edna n\u00e3o \u00e9 apenas um composto b\u00e1sico, mas tamb\u00e9m um \u00e1cido fraco e uma base fraca para compostos de sal \u00e1cido. Portanto, a alanto\u00edna pode formar sais met\u00e1licos e adutos com muitas subst\u00e2ncias. Esses sais met\u00e1licos e adutos n\u00e3o apenas mant\u00eam as propriedades da pr\u00f3pria alanto\u00edna, mas tamb\u00e9m n\u00e3o perdem as propriedades inerentes das subst\u00e2ncias adicionadas. A seguir, listaremos algumas propriedades f\u00edsicas e qu\u00edmicas dos compostos de alum\u00ednio da alanto\u00edna como exemplo.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">Os compostos de alum\u00ednio da alanto\u00edna oferecem uma ampla gama de fun\u00e7\u00f5es eficazes para o tratamento de doen\u00e7as de pele. Porque a converg\u00eancia do \u00edon de alum\u00ednio e as caracter\u00edsticas ideais da alanto\u00edna s\u00e3o totalmente combinadas. A presen\u00e7a da alanto\u00edna melhora o efeito do sal de alum\u00ednio e elimina a irrita\u00e7\u00e3o de alguns pacientes com alergia ao sal de alum\u00ednio. Experimentos em animais tamb\u00e9m mostraram que o sal de alum\u00ednio com alanto\u00edna n\u00e3o causa irrita\u00e7\u00e3o nem alergia. V\u00e1rias formas comuns s\u00e3o as seguintes:<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">1. Dihidroxialantoinato de alum\u00ednio<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">O di-hidroxialantoinato de alum\u00ednio tem a f\u00f3rmula molecular Al(OH)<sub>2<\/sub>C<sub>4<\/sub>H<sub>5<\/sub>N<sub>4<\/sub>O<sub>3<\/sub>. \u00c9 um p\u00f3 branco, insol\u00favel em \u00e1gua e em outros solventes, como etanol, \u00e9ter e clorof\u00f3rmio. Sua denomina\u00e7\u00e3o comercial internacional \u00e9 \"aldioxa\". A composi\u00e7\u00e3o do dihidroxialantoinato de alum\u00ednio \u00e9 a seguinte: \u00f3xido de alum\u00ednio (22,0 \u00b1 5)%, alanto\u00edna (55,0 \u00b1 5)%, valor de pH (suspens\u00e3o de 4%) \u00e9 de 6-5,8.<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">2. Alantoinato de alum\u00ednio, cloridr\u00f3xido de alum\u00ednio, prorylene glicol<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">A f\u00f3rmula molecular do di-hidroxialantoinato de alum\u00ednio \u00e9 [Al<sub>2<\/sub>(OH)<sub>4<\/sub>ClC<sub>4<\/sub>H<sub>5<\/sub>N<sub>4<\/sub>O<sub>3<\/sub>]C<sub>3<\/sub>H<sub>8<\/sub>O<sub>2<\/sub>. \u00c9 um p\u00f3 branco, em estado molecular ou forma modificada, e \u00e9 usado como desodorante, agente umectante e adstringente para a pele.<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">3. Alantoinato de alum\u00ednio e cloreto de s\u00f3dio<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">A f\u00f3rmula do alantoinato de alum\u00ednio clor\u00eddrico \u00e9 Al<sub>2<\/sub>(OH)<sub>4<\/sub>ClC<sub>4<\/sub>H<sub>5<\/sub>N<sub>4<\/sub>O<sub>3<\/sub>. O alantoinato de alum\u00ednio clor\u00eddrico \u00e9 um p\u00f3 branco puro, sol\u00favel em \u00e1gua, ligeiramente sol\u00favel em etanol, insol\u00favel em \u00e9ter e imita\u00e7\u00e3o de cloro. O nome comercial internacional do alantoinato de alum\u00ednio clor\u00eddrico \u00e9 \"alcloxa\": \u00d3xido de alum\u00ednio (28,0 \u00b1 3)%, alanto\u00edna (40,0 \u00b1 3)%, cloro (9,5 \u00b1 1,5)%, nitrog\u00eanio (14,2 \u00b1 1,5)%.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">Ao mesmo tempo, a composi\u00e7\u00e3o da alanto\u00edna de cloroalum\u00ednio modificada \u00e9 a seguinte: \u00d3xido de alum\u00ednio (45,61 \u00b1 2,0)%, alanto\u00edna (1,25 \u00b1 0,3)%, cloro (15,60 \u00b1 1,5). O valor do pH da solu\u00e7\u00e3o 10% de alantoinato de alum\u00ednio clor\u00eddrico \u00e9 de aproximadamente 4,3.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">De acordo com os relat\u00f3rios da literatura, os principais m\u00e9todos sint\u00e9ticos da alanto\u00edna s\u00e3o os seguintes:<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">1. Rea\u00e7\u00e3o do \u00e1cido \u00farico com permanganato de pot\u00e1ssio<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">O \u00e1cido \u00farico e o permanganato de pot\u00e1ssio s\u00e3o oxidados em meio alcalino, e os produtos s\u00e3o descarboxilados com \u00e1cido ac\u00e9tico. Os oxidantes tamb\u00e9m podem ser di\u00f3xido de chumbo, ferricianeto de pot\u00e1ssio, oxig\u00eanio, oz\u00f4nio, di\u00f3xido de mangan\u00eas, per\u00f3xido de hidrog\u00eanio etc. O processo de rea\u00e7\u00e3o \u00e9 o seguinte:<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">Primeiro, a rea\u00e7\u00e3o de oxida\u00e7\u00e3o. O \u00e1cido \u00farico e o permanganato de pot\u00e1ssio reagem.<\/h4>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"525\" height=\"174\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/2-1.png\" alt=\"\" class=\"wp-image-3485\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/2-1.png 525w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/2-1-300x99.png 300w\" sizes=\"(max-width: 525px) 100vw, 525px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Em seguida, a rea\u00e7\u00e3o de abertura do anel de descarboxila\u00e7\u00e3o obt\u00e9m o produto final.<\/h4>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"778\" height=\"159\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/3-1.png\" alt=\"\" class=\"wp-image-3486\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/3-1.png 778w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/3-1-300x61.png 300w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/3-1-768x157.png 768w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/3-1-600x123.png 600w\" sizes=\"(max-width: 778px) 100vw, 778px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Essa \u00e9 a rota de processo mais antiga, que se limita \u00e0 produ\u00e7\u00e3o de pequenos lotes devido \u00e0 escassez de mat\u00e9rias-primas, ao alto pre\u00e7o, ao grande volume de equipamentos e ao alto custo.<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">2. Oxida\u00e7\u00e3o eletrol\u00edtica do urato de l\u00edtio<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">A alanto\u00edna foi sintetizada pela condensa\u00e7\u00e3o de \u00e1cido gliox\u00edlico e ureia sob eletricidade.<\/h4>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"425\" height=\"133\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/4-1.png\" alt=\"\" class=\"wp-image-3487\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/4-1.png 425w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2020\/12\/4-1-300x94.png 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Embora o rendimento desse m\u00e9todo seja um pouco maior do que o do m\u00e9todo de oxida\u00e7\u00e3o do \u00e1cido \u00farico, ele tamb\u00e9m apresenta os problemas acima e tem menos aplica\u00e7\u00e3o industrial.<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">3. Oxida\u00e7\u00e3o eletrol\u00edtica do \u00e1cido ox\u00e1lico<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Esse \u00e9 um novo processo desenvolvido nos \u00faltimos anos, e essa linha de produ\u00e7\u00e3o foi estabelecida na China. As mat\u00e9rias-primas s\u00e3o f\u00e1ceis de obter, mas o consumo de energia \u00e9 grande. De acordo com a literatura, o processo n\u00e3o est\u00e1 maduro e precisa ser aprimorado.<\/h4>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"651\" height=\"199\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/1.png\" alt=\"\" class=\"wp-image-3976\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/1.png 651w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/1-300x92.png 300w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/1-600x183.png 600w\" sizes=\"(max-width: 651px) 100vw, 651px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">4. Oxida\u00e7\u00e3o do glioxal<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Como o \u00e1cido gliox\u00edlico pode ser preparado pela oxida\u00e7\u00e3o parcial do glioxal e as condi\u00e7\u00f5es do processo s\u00e3o brandas, essa rota sint\u00e9tica \u00e9 frequentemente usada no setor. No entanto, esse m\u00e9todo usa \u00e1cido n\u00edtrico para oxidar, o que causa s\u00e9ria polui\u00e7\u00e3o ambiental.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">Primeiro, a oxida\u00e7\u00e3o parcial do glioxal para obter o \u00e1cido gliox\u00edlico.<\/h4>\n\n\n\n<h2 class=\"wp-block-heading\"><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"552\" height=\"60\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/2.png\" alt=\"\" class=\"wp-image-3977\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/2.png 552w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/2-300x33.png 300w\" sizes=\"(max-width: 552px) 100vw, 552px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Ele tem duas rea\u00e7\u00f5es colaterais que s\u00e3o apresentadas a seguir, portanto, o rendimento dessa maneira de obter o \u00e1cido gliox\u00edlico \u00e9 de aproximadamente 83%.<\/h4>\n\n\n\n<h2 class=\"wp-block-heading\"><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"462\" height=\"131\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/3.png\" alt=\"\" class=\"wp-image-3978\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/3.png 462w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/3-300x85.png 300w\" sizes=\"(max-width: 462px) 100vw, 462px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Em seguida, s\u00edntese de alanto\u00edna por condensa\u00e7\u00e3o de \u00e1cido gliox\u00edlico e ureia sob aquecimento e condi\u00e7\u00e3o \u00e1cida.<\/h4>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"656\" height=\"145\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/4.png\" alt=\"\" class=\"wp-image-3979\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/4.png 656w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/4-300x66.png 300w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/4-600x133.png 600w\" sizes=\"(max-width: 656px) 100vw, 656px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">A convers\u00e3o do \u00e1cido gliox\u00edlico por essa via \u00e9 de 52% \uff5e 58%. De acordo com todas as rea\u00e7\u00f5es, contadas pelo glioxal, o rendimento da alanto\u00edna \u00e9 38% - 40% do valor te\u00f3rico.<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">5. Rea\u00e7\u00e3o da ureia com \u00e1cido dicloroac\u00e9tico<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Ele \u00e9 preparado pelo aquecimento de 2 mol de ureia e 1 mol de \u00e1cido dicloroac\u00e9tico. O processo de rea\u00e7\u00e3o \u00e9 o seguinte:<\/h4>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"689\" height=\"270\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/5.png\" alt=\"\" class=\"wp-image-3980\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/5.png 689w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/5-300x118.png 300w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/5-600x235.png 600w\" sizes=\"(max-width: 689px) 100vw, 689px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Na d\u00e9cada de 1930, uma patente americana relatou que a alanto\u00edna poderia ser produzida em etileno glicol a 120 \u2103 por 4 horas, mas o rendimento era baixo. O rendimento total do \u00e1cido alanto\u00edna-p-dicloroac\u00e9tico pode chegar a 30,3%. Alguns pesquisadores da China estudaram o processo e obtiveram um rendimento total de alanto\u00edna superior a 40%. A rotina completa \u00e9 a seguinte.<\/h4>\n\n\n\n<h2 class=\"wp-block-heading\"><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"638\" height=\"221\" src=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/6.png\" alt=\"\" class=\"wp-image-3981\" srcset=\"https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/6.png 638w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/6-300x104.png 300w, https:\/\/longchangchemical.com\/wp-content\/uploads\/2021\/01\/6-600x208.png 600w\" sizes=\"(max-width: 638px) 100vw, 638px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Atualmente, outras formas de desenvolvimento e pesquisa de tecnologia tamb\u00e9m s\u00e3o muito ativas, tentando obter sucesso a um custo menor, como o m\u00e9todo do acetileno, di\u00f3xido de carbono, mon\u00f3xido de carbono e outros m\u00e9todos de recupera\u00e7\u00e3o de g\u00e1s residual de alto teor. No entanto, at\u00e9 o momento, nenhum relat\u00f3rio foi colocado em produ\u00e7\u00e3o. Como um importante produto industrial, a alanto\u00edna precisa de mais pesquisas sint\u00e9ticas para ser apoiada.<\/h4>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"block-b4c0eeaf-7d48-4b9c-9bec-7357c3ccc6ad\"><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/allantoin-cas-97-59-6\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"has-inline-color has-vivid-cyan-blue-color\">onde comprar Allantoin\uff1f<\/span><\/a><\/strong><\/h2>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"block-ec1c94cf-d71a-405b-bc1c-0f668efbb6ff\"><strong>A Longchang Chemical \u00e9 especializada na produ\u00e7\u00e3o e fornecimento de Allantoin CAS 97-59-6. Geralmente, entramos em contato com voc\u00ea em 24 horas. Voc\u00ea tamb\u00e9m pode me enviar um e-mail para info@longchangchemical.com durante o hor\u00e1rio comercial (das 8h30 \u00e0s 18h UTC+8 de segunda a s\u00e1bado) ou usar o bate-papo ao vivo do site para obter uma resposta r\u00e1pida.<\/strong><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"block-7edc1230-2340-4d50-bcbf-7af68000beef\"><strong>Este artigo foi escrito pelo Departamento de P&amp;D da Longchang Chemical. Se voc\u00ea precisar copiar e reimprimir, indique a fonte<\/strong>.<\/h4>\n\n\n<!-- lc-commercial-start -->\n<h2>A practical selection checklist for wetting, leveling, and defoaming additives<\/h2>\n<p>Additive selection is usually most effective when the team defines the defect first and then screens compatibility, dosage range, and process stage. That is often much more reliable than choosing only by chemistry family or by a single dramatic lab result.<\/p>\n<ul>\n<li><strong>Start from the defect, not the additive name:<\/strong> wetting loss, crater, microfoam, and instability often need different solutions even inside the same formula.<\/li>\n<li><strong>Check compatibility at the intended dosage:<\/strong> the strongest additive can still be the wrong commercial choice if it narrows the process window too much.<\/li>\n<li><strong>Review the stage of use:<\/strong> some products are most useful during grind, while others matter more during let-down, filling, or final application.<\/li>\n<li><strong>Balance cure or film quality with defect control:<\/strong> the right additive fixes the problem without sacrificing adhesion, gloss, or appearance.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiaf-094\/\">CHLUMIAF 094<\/a>:<\/strong> A balanced defoamer reference for waterborne coatings and many general foam-control screens.<\/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> A stronger process-defoaming option when persistent foam survives harsher conditions.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiwe-3280\/\">CHLUMIWE 3280<\/a>:<\/strong> A strong wetting-agent reference for inks, coatings, and difficult substrate wetting.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why does an additive that looks powerful in a beaker sometimes fail in production?<\/strong><br \/>Because shear, temperature, substrate, and the full formula can all change the way the additive performs under real process conditions.<\/p>\n<p><strong>Should the most aggressive additive always be preferred?<\/strong><br \/>Not usually. The best additive is the one that solves the real defect while preserving the broadest safe operating window.<\/p>\n<!-- lc-commercial-end -->","protected":false},"excerpt":{"rendered":"<p>Due to its wide application, the demand for allantoin has been increasing year by year . The chemical synthesis method of allantoin appeared in foreign countries in the 1940s. But<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[],"class_list":["post-3483","post","type-post","status-publish","format-standard","hentry","category-medicine-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Properties and synthetic routes of allantoin and its derivatives - Longchang Chemical Co., Ltd.<\/title>\n<meta name=\"description\" content=\"Properties and synthetic routes of allantoin and its derivatives. Longchang Chemical specializes in the production and supply of Allantoin CAS 97-59-6. 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