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Novos silicones fornecem cura secundária para acrilatos - Know More. Create More.


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Paint InnovationArtigos TécnicosNovos silicones fornecem cura secundária para acrilatos

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Novos silicones fornecem cura secundária para acrilatos

São avaliados dois silicones curáveis ​​por condensação, com porções trimetoxi silil e isocianato.

Dois silicones curáveis ​​por condensação, com frações trimetoxi silil e isocianato, são avaliados. Quando formulados com silicones funcionais duplos de hidroxila e acrilato com cura energética, esses materiais exibem módulo de cisalhamento e rigidez aumentados, desenvolvendo-se ao longo do tempo, mesmo em condições ambientais.

Introdução
O uso de vias secundárias de cura em sistemas de energia curada é praticado há muitos anos. Nesses sistemas, um mecanismo de cura por condensação é incluído no projeto do revestimento, além das porções de energia curada. Seja uma “cura” para a sombra ou para melhorar as propriedades gerais do filme, essa técnica é bem demonstrada. Queríamos explorar a utilidade de alguns de nossos silicones exclusivos como componentes secundários de cura. Examinaremos os polímeros com grupos trialcoxi silano ou a funcionalidade isocianato anexada ao esqueleto de silicone. Também usaremos na formulação polímeros de silicone com grupos hidroxila e acrilato. O primeiro reagirá ao longo da via de condensação secundária e a funcionalidade de acrilato polimerizará em resposta à luz.

Experimental
As estruturas salientes usadas no estudo são mostradas na Figura 1. O valor de x é 10 ou 50. A funcionalidade de acrilato dos materiais OH ACR reagirá com o fotoiniciador, iniciando uma reação de radicais livres que polimerizará as ligações duplas de o grupo acrilato. Esta reação será iniciada por radiação e algumas das propriedades do filme se desenvolverão muito rapidamente a partir dessa reação curada por energia.

 

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