Mecanismo de rea\u00e7\u00e3o da resina ep\u00f3xi e do mon\u00f4mero de politiol?<\/p>\n
O mecanismo de rea\u00e7\u00e3o entre as resinas ep\u00f3xi e os polit\u00f3is envolve principalmente a intera\u00e7\u00e3o entre o grupo tiol e o grupo ep\u00f3xi. Veja a seguir o mecanismo de rea\u00e7\u00e3o detalhado:
\nIn\u00edcio da rea\u00e7\u00e3o:<\/p>\n
Durante a rea\u00e7\u00e3o entre os politi\u00f3is e as resinas ep\u00f3xi, o par de el\u00e9trons n\u00e3o compartilhado na amina terci\u00e1ria capturar\u00e1 primeiro o hidrog\u00eanio ativo do grupo tiol, resultando em uma carga ani\u00f4nica no \u00e1tomo de enxofre.<\/p>\n
<\/p>\n
Rea\u00e7\u00e3o de adi\u00e7\u00e3o nucleof\u00edlica:<\/p>\n
O \u00e1tomo de enxofre carregado negativamente reage com o \u00e1tomo de carbono alfa na resina ep\u00f3xi em um processo chamado de rea\u00e7\u00e3o de adi\u00e7\u00e3o nucleof\u00edlica.<\/p>\n
Essa rea\u00e7\u00e3o resulta na abertura do grupo ep\u00f3xi tern\u00e1rio da resina ep\u00f3xi para formar dois grupos hidroxila.<\/p>\n
<\/p>\n
S\u00e3o formadas liga\u00e7\u00f5es tiol-oxig\u00eanio:<\/p>\n
O \u00e1tomo de enxofre no grupo tiol reage com o \u00e1tomo de oxig\u00eanio no grupo ep\u00f3xi em uma rea\u00e7\u00e3o de adi\u00e7\u00e3o nucleof\u00edlica para formar uma liga\u00e7\u00e3o enxofre-oxig\u00eanio, que \u00e9 uma etapa fundamental no processo de cura.<\/p>\n
<\/p>\n
Forma\u00e7\u00e3o da estrutura de liga\u00e7\u00f5es cruzadas:<\/p>\n
Os dois grupos hidroxila formados na resina ep\u00f3xi reagem posteriormente com os grupos mercaptanos contidos no politiol para formar uma estrutura reticulada.<\/p>\n
Essa estrutura de liga\u00e7\u00e3o cruzada liga o politiol \u00e0 resina ep\u00f3xi.<\/p>\n
<\/p>\n
Resultados da cura:<\/p>\n
Por meio da rea\u00e7\u00e3o acima, o politiol e a resina ep\u00f3xi s\u00e3o combinados para formar um material s\u00f3lido que \u00e9 resistente \u00e0 abras\u00e3o, \u00e0 corros\u00e3o e a altas temperaturas.<\/p>\n
<\/p>\n
Caracter\u00edsticas da rea\u00e7\u00e3o:<\/p>\n
O tempo de cura do ep\u00f3xi curado com polissulfeto \u00e9 geralmente de alguns minutos a algumas horas e n\u00e3o requer tratamento de alta temperatura ou alta press\u00e3o, o que o torna amplamente utilizado na produ\u00e7\u00e3o industrial.<\/p>\n
O material curado tem excelentes propriedades f\u00edsicas e qu\u00edmicas, como resist\u00eancia \u00e0 abras\u00e3o, resist\u00eancia \u00e0 corros\u00e3o, bom isolamento e outras caracter\u00edsticas.<\/p>\n
Em resumo, o mecanismo de rea\u00e7\u00e3o da resina ep\u00f3xi e do politiol \u00e9 um processo complexo, mas altamente eficiente, que realiza a liga\u00e7\u00e3o estreita e a cura dos dois materiais por meio da rea\u00e7\u00e3o de adi\u00e7\u00e3o nucleof\u00edlica e da forma\u00e7\u00e3o de uma estrutura reticulada.<\/p>\n
<\/p>\n
Most successful UV formulations are built by choosing the backbone first and then tuning the reactive monomer package around the substrate, cure method, and end-use stress. That usually produces a more stable result than choosing materials by viscosity or price alone.<\/p>\n
Can one UV monomer or resin solve every formulation problem?<\/strong> Why should monomers be screened together with oligomers?<\/strong> <\/p>\n <\/p>\n Quick answer:<\/strong> In practical UV formulation work, resin and monomer selection starts with the end-use property target, then tunes viscosity and cure response around it. Buyers usually shortlist a few matched packages, not a single magic raw material.<\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>","protected":false},"excerpt":{"rendered":" The reaction mechanism between epoxy resins and polythiols mainly involves the interaction between the thiol group and the epoxy group. The following is the detailed reaction mechanism: Reaction initiation: During<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143],"tags":[],"class_list":["post-7479","post","type-post","status-publish","format-standard","hentry","category-uv-light-curing-series"],"yoast_head":"\n
Usually no. Commercially strong formulas depend on how several components work together to balance cure, adhesion, flow, and durability.<\/p>\n
Because monomers can change viscosity, cure rate, shrinkage, and substrate behavior enough to alter the final ranking of the same backbone resin.<\/p>\nEntre em contato conosco agora!<\/b><\/strong><\/h2>\n
Se precisar do Price, preencha suas informa\u00e7\u00f5es de contato no formul\u00e1rio abaixo. Normalmente, entraremos em contato dentro de 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>\n
\n\n\n
\n Poliol\/Polimercaptana<\/strong><\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n Mon\u00f4mero DMES<\/a><\/span><\/td>\n Sulfeto de bis(2-mercaptoetil)<\/td>\n 3570-55-6<\/td>\n<\/tr>\n \n Mon\u00f4mero DMPT<\/a><\/span><\/td>\n THIOCURE DMPT<\/td>\n 131538-00-6<\/td>\n<\/tr>\n \n Mon\u00f4mero de PETMP<\/a><\/span><\/td>\n TETRA(3-MERCAPTOPROPIONATO) DE PENTAERITRITOL<\/td>\n 7575-23-7<\/td>\n<\/tr>\n \n Mon\u00f4mero PM839<\/a><\/span><\/td>\n Polioxi(metil-1,2-etanodil)<\/td>\n 72244-98-5<\/td>\n<\/tr>\n \n Mon\u00f4mero monofuncional<\/strong><\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n Mon\u00f4mero HEMA<\/a><\/span><\/td>\n Metacrilato de 2-hidroxietil<\/td>\n 868-77-9<\/td>\n<\/tr>\n \n Mon\u00f4mero HPMA<\/a><\/span><\/td>\n Metacrilato de 2-hidroxipropila<\/td>\n 27813-02-1<\/td>\n<\/tr>\n \n Mon\u00f4mero THFA<\/a><\/span><\/td>\n Acrilato de tetrahidrofurfurila<\/td>\n 2399-48-6<\/td>\n<\/tr>\n \n Mon\u00f4mero HDCPA<\/a><\/span><\/td>\n Acrilato de diciclopentenila hidrogenado<\/td>\n 79637-74-4<\/td>\n<\/tr>\n \n Mon\u00f4mero DCPMA<\/a><\/span><\/td>\n Metacrilato de di-hidrodiciclopentadienila<\/td>\n 30798-39-1<\/td>\n<\/tr>\n \n Mon\u00f4mero DCPA<\/a><\/span><\/td>\n Acrilato de di-hidrodiciclopentadienila<\/td>\n 12542-30-2<\/td>\n<\/tr>\n \n Mon\u00f4mero DCPEMA<\/a><\/span><\/td>\n Metacrilato de diciclopenteniloxietil<\/td>\n 68586-19-6<\/td>\n<\/tr>\n \n Mon\u00f4mero DCPEOA<\/a><\/span><\/td>\n Acrilato de diciclopenteniloxietil<\/td>\n 65983-31-5<\/td>\n<\/tr>\n \n Mon\u00f4mero NP-4EA<\/a><\/span><\/td>\n (4) nonilfenol etoxilado<\/td>\n 50974-47-5<\/td>\n<\/tr>\n \n Mon\u00f4mero LA<\/td>\n Acrilato de laurila \/ Acrilato de dodecila<\/td>\n 2156-97-0<\/td>\n<\/tr>\n \n Mon\u00f4mero THFMA<\/a><\/span><\/td>\n Metacrilato de tetrahidrofurfurila<\/td>\n 2455-24-5<\/td>\n<\/tr>\n \n Mon\u00f4mero de PHEA<\/span><\/a><\/td>\n ACRILATO DE 2-FENOXIETIL<\/td>\n 48145-04-6<\/td>\n<\/tr>\n \n Mon\u00f4mero LMA<\/a><\/span><\/td>\n Metacrilato de lauril<\/td>\n 142-90-5<\/td>\n<\/tr>\n \n Mon\u00f4mero IDA<\/a><\/span><\/td>\n Acrilato de isodecila<\/td>\n 1330-61-6<\/td>\n<\/tr>\n \n Mon\u00f4mero IBOMA<\/a><\/span><\/td>\n Metacrilato de isobornila<\/td>\n 7534-94-3<\/td>\n<\/tr>\n \n Mon\u00f4mero IBOA<\/a><\/span><\/td>\n Acrilato de isobornila<\/td>\n 5888-33-5<\/td>\n<\/tr>\n \n Mon\u00f4mero EOEOEA<\/a><\/span><\/td>\n 2-(2-Etoxietoxi)acrilato de etila<\/td>\n 7328-17-8<\/td>\n<\/tr>\n \n Mon\u00f4mero multifuncional<\/strong><\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n DPHA Mon\u00f4mero<\/a><\/span><\/td>\n Dipentaeritritol hexaacrilato<\/td>\n 29570-58-9<\/td>\n<\/tr>\n \n Mon\u00f4mero DI-TMPTA<\/a><\/span><\/td>\n TETRAACRILATO DE DI(TRIMETILOLPROPANO)<\/td>\n 94108-97-1<\/td>\n<\/tr>\n \n Mon\u00f4mero de acrilamida<\/strong><\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n Mon\u00f4mero ACMO<\/a><\/span><\/td>\n 4-acriloilmorfolina<\/td>\n 5117-12-4<\/td>\n<\/tr>\n \n Mon\u00f4mero di-funcional<\/strong><\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n Mon\u00f4mero PEGDMA<\/a><\/span><\/td>\n Dimetacrilato de poli(etilenoglicol)<\/td>\n 25852-47-5<\/td>\n<\/tr>\n \n Mon\u00f4mero TPGDA<\/a><\/span><\/td>\n Diacrilato de tripropilenoglicol<\/td>\n 42978-66-5<\/td>\n<\/tr>\n \n Mon\u00f4mero TEGDMA<\/a><\/span><\/td>\n Dimetacrilato de trietilenoglicol<\/td>\n 109-16-0<\/td>\n<\/tr>\n \n Mon\u00f4mero PO2-NPGDA<\/span><\/a><\/td>\n Diacrilato de neopentileno glicol propoxilado<\/td>\n 84170-74-1<\/td>\n<\/tr>\n \n Mon\u00f4mero de PEGDA<\/a><\/span><\/td>\n Diacrilato de polietileno glicol<\/td>\n 26570-48-9<\/td>\n<\/tr>\n \n Mon\u00f4mero PDDA<\/a><\/span><\/td>\n Ftalato de diacrilato de dietilenoglicol<\/td>\n <\/td>\n<\/tr>\n \n Mon\u00f4mero NPGDA<\/a><\/span><\/td>\n Diacrilato de neopentil glicol<\/td>\n 2223-82-7<\/td>\n<\/tr>\n \n Mon\u00f4mero HDDA<\/a><\/span><\/td>\n Diacrilato de hexametileno<\/td>\n 13048-33-4<\/td>\n<\/tr>\n \n Mon\u00f4mero EO4-BPADA<\/span><\/a><\/td>\n DIACRILATO DE BISFENOL A ETOXILADO (4)<\/td>\n 64401-02-1<\/td>\n<\/tr>\n \n Mon\u00f4mero EO10-BPADA<\/a><\/span><\/td>\n DIACRILATO DE BISFENOL A ETOXILADO (10)<\/td>\n 64401-02-1<\/td>\n<\/tr>\n \n Mon\u00f4mero EGDMA<\/a><\/span><\/td>\n Dimetacrilato de etilenoglicol<\/td>\n 97-90-5<\/td>\n<\/tr>\n \n Mon\u00f4mero DPGDA<\/a><\/span><\/td>\n Dienoato de Dipropileno Glicol<\/td>\n 57472-68-1<\/td>\n<\/tr>\n \n Mon\u00f4mero Bis-GMA<\/a><\/span><\/td>\n Bisfenol A Metacrilato de glicidila<\/td>\n 1565-94-2<\/td>\n<\/tr>\n \n Mon\u00f4mero trifuncional<\/strong><\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n Mon\u00f4mero TMPTMA<\/a><\/span><\/td>\n Trimetacrilato de trimetilolpropano<\/td>\n 3290-92-4<\/td>\n<\/tr>\n \n Mon\u00f4mero de TMPTA<\/a><\/span><\/td>\n Triacrilato de trimetilolpropano<\/td>\n 15625-89-5<\/td>\n<\/tr>\n \n Mon\u00f4mero PETA<\/a><\/span><\/td>\n Triacrilato de pentaeritritol<\/td>\n 3524-68-3<\/td>\n<\/tr>\n \n Mon\u00f4mero de GPTA ( G3POTA )<\/a><\/span><\/td>\n TRIACRILATO DE GLICERIL PROPOXI<\/td>\n 52408-84-1<\/td>\n<\/tr>\n \n Mon\u00f4mero EO3-TMPTA<\/a><\/span><\/td>\n Triacrilato de trimetilolpropano etoxilado<\/td>\n 28961-43-5<\/td>\n<\/tr>\n \n Mon\u00f4mero fotorresistente<\/strong><\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n Mon\u00f4mero IPAMA<\/a><\/span><\/td>\n Metacrilato de 2-isopropil-2-adamantila<\/td>\n 297156-50-4<\/td>\n<\/tr>\n \n Mon\u00f4mero ECPMA<\/a><\/span><\/td>\n Metacrilato de 1-etilciclopentila<\/td>\n 266308-58-1<\/td>\n<\/tr>\n \n Mon\u00f4mero ADAMA<\/a><\/span><\/td>\n Metacrilato de 1-amant\u00edlico<\/td>\n 16887-36-8<\/td>\n<\/tr>\n \n Mon\u00f4mero de metacrilatos<\/strong><\/td>\n <\/td>\n <\/td>\n<\/tr>\n \n Mon\u00f4mero TBAEMA<\/a><\/span><\/td>\n Metacrilato de 2-(terc-butilamino)etila<\/td>\n 3775-90-4<\/td>\n<\/tr>\n \n Mon\u00f4mero NBMA<\/a><\/span><\/td>\n Metacrilato de n-butilo<\/td>\n 97-88-1<\/td>\n<\/tr>\n \n Mon\u00f4mero MEMA<\/a><\/span><\/td>\n Metacrilato de 2-metoxietil<\/td>\n 6976-93-8<\/td>\n<\/tr>\n \n Mon\u00f4mero i-BMA<\/a><\/span><\/td>\n Metacrilato de isobutilo<\/td>\n 97-86-9<\/td>\n<\/tr>\n \n Mon\u00f4mero EHMA<\/a><\/span><\/td>\n Metacrilato de 2-etil-hexila<\/td>\n 688-84-6<\/td>\n<\/tr>\n \n Mon\u00f4mero EGDMP<\/a><\/span><\/td>\n Bis(3-mercaptopropionato) de etilenoglicol<\/td>\n 22504-50-3<\/td>\n<\/tr>\n \n Mon\u00f4mero EEMA<\/a><\/span><\/td>\n 2-etoxietil 2-metilprop-2-enoato<\/td>\n 2370-63-0<\/td>\n<\/tr>\n \n Mon\u00f4mero DMAEMA<\/a><\/span><\/td>\n N,M-Dimetilaminoetil metacrilato<\/td>\n 2867-47-2<\/td>\n<\/tr>\n \n Mon\u00f4mero DEAM<\/a><\/span><\/td>\n Metacrilato de dietilaminoetila<\/td>\n 105-16-8<\/td>\n<\/tr>\n \n Mon\u00f4mero CHMA<\/a><\/span><\/td>\n Metacrilato de ciclohexila<\/td>\n 101-43-9<\/td>\n<\/tr>\n \n Mon\u00f4mero BZMA<\/a><\/span><\/td>\n Metacrilato de benzila<\/td>\n 2495-37-6<\/td>\n<\/tr>\n \n Mon\u00f4mero BDDMP<\/a><\/span><\/td>\n Di(3-mercaptopropionato) de 1,4-butanodiol<\/td>\n 92140-97-1<\/td>\n<\/tr>\n \n Mon\u00f4mero de BDDMA<\/a><\/span><\/td>\n 1,4-Butanodioldimetacrilato<\/td>\n 2082-81-7<\/td>\n<\/tr>\n \n Mon\u00f4mero AMA<\/a><\/span><\/td>\n Metacrilato de alila<\/td>\n 96-05-9<\/td>\n<\/tr>\n \n Mon\u00f4mero AAEM<\/a><\/span><\/td>\n Metacrilato de acetilacetoxietil<\/td>\n 21282-97-3<\/td>\n<\/tr>\n \n Mon\u00f4mero de acrilatos<\/strong><\/td>\n <\/td>\n<\/tr>\n \n Mon\u00f4mero de IBA<\/a><\/span><\/td>\n Acrilato de isobutilo<\/td>\n 106-63-8<\/td>\n<\/tr>\n \n Mon\u00f4mero EMA<\/a><\/span><\/td>\n Metacrilato de etila<\/td>\n 97-63-2<\/td>\n<\/tr>\n \n Mon\u00f4mero DMAEA<\/a><\/span><\/td>\n Acrilato de dimetilaminoetila<\/td>\n 2439-35-2<\/td>\n<\/tr>\n \n Mon\u00f4mero DEAEA<\/a><\/span><\/td>\n 2-(dietilamino)etil prop-2-enoato<\/td>\n 2426-54-2<\/td>\n<\/tr>\n \n Mon\u00f4mero CHA<\/a><\/span><\/td>\n ciclohexil prop-2-enoato<\/td>\n 3066-71-5<\/td>\n<\/tr>\n \n Mon\u00f4mero BZA<\/a><\/span><\/td>\n prop-2-enoato de benzila<\/td>\n 2495-35-4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n