10-09-2020 дата публикации
Номер: US20200283595A1
Принадлежит:
This invention provides a self-healable epoxy resin and its preparation, recycling and remolding method. With the catalyst of potassium iodide, an ester solution of 2-mercaptoacetic acid was oxidated by 30% HOto form 2,2′-dithiodiacetic acid; then 2,2′-dithiodiacetic acid was dehydrated and cyclizated by anhydride to form 1,4,5-oxadithiepane-2,7-dione; 1,4,5-oxadithiepane-2,7-dione and methylhexahydrophthalic anhydride were mixed by mass ratio and cured with epoxides to get the self-healable epoxy resin. Through controlling dynamic and permanent three-dimensional crosslinked network, the self-healable epoxy resins provided in this invention exhibit high thermal resistance and improved mechanical properties as well as excellent self-healing ability, recyclability and remoldability. This invention provides a preparation method with the merits of low cost, simple production processes, broad application prospects and strong utility. 1. A method for preparing a self-healable epoxy resin , comprising:{'sub': 2', '2, 'b': '2', '(1) by mass, at 20 to 30° C., 120 parts of 2-mercaptoacetic acid, 500 to 700 parts of ester solvent and 0.6 to 1.2 parts of potassium iodide were mixed homogeneously to obtain a solution; 80 to 90 parts of 30 wt % HOwere added dropwise to the solution and continued to react for to 4 h to get 2,2′-dithiodiacetic acid;'}(2) by mass, at 20 to 30° C., 100 parts of 2,2′-dithiodiacetic acid and 120 to 150 parts of anhydride were mixed homogeneously and continued to react for 2 to 4 h to get 1,4,5-oxadithiepane-2,7-dione;(3) by mass, at 50 to 70° C., 100 parts of epoxy resin, 42 to 84 parts of 1,4,5-oxadithiepane-2,7-dione and 0 to 43 parts of methylhexahydrophthalic anhydride were mixed homogeneously, after curing, the self-healable epoxy resin was obtained.2. A method for preparing 1 ,4 ,5-oxadithiepane-2 ,7-dione , comprising:{'sub': 2', '2, '(1) by mass, at 20 to 30° C., 120 parts of 2-mercaptoacetic acid, 500 to 700 parts of ester solvent and 0.6 to 1 ...
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