Toughened epoxy adhesive capable of being reprocessed and recycled and curing method
A technology of epoxy adhesive and curing method, applied in the direction of adhesive, epoxy resin glue, adhesive type, etc., can solve the problem that the toughness of epoxy adhesive and the recyclability of reprocessing cannot be both, and achieve good toughness, The effect of good low temperature flexibility and high compatibility
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Embodiment 1
[0031] A kind of curing method of the toughened epoxy adhesive that can be reprocessed and recycled comprises the steps:
[0032] Step 1: Preparation of toughening agent aromatic amine-terminated polysulfide resin: Weigh 100 g of mercapto-terminated liquid polysulfide resin with a relative molecular mass of 4000, 6.2 g of 2,2′-diaminodiphenyl disulfide, 2, Add 0.1 g of 4,6-tris(dimethylaminomethyl)phenol and 150 g of solvent dioxymethane into the reaction bottle, stir and reflux under nitrogen protection, and heat at 120°C for 24 hours to make the disulfide bond in diaminodiphenyl disulfide Fully exchange with the disulfide bond in the main chain of polysulfide resin, monitor the reaction process by TLC until the raw material point of diaminodiphenyl disulfide completely disappears, cool to 60°C, add 5g hydrogen peroxide, and react under nitrogen protection for 12 Hours, the thiol is completely oxidatively coupled, infrared spectroscopy monitors the thiol 2562cm -1 The absorp...
Embodiment 2
[0035] A kind of curing method of the toughened epoxy adhesive that can be reprocessed and recycled comprises the steps:
[0036]Step 1: Preparation of the toughening agent aromatic amine-terminated polysulfide resin: Weigh 100 g of mercapto-terminated liquid polysulfide resin with a relative molecular mass of 1000, 24.8 g of 2,2′-diaminodiphenyl disulfide, triethyl Add 0.1g of amine and 150g of solvent dioxymethane into the reaction bottle, stir and reflux under nitrogen protection, heat at 150°C, and react for 36 hours, so that the disulfide bonds in the diaminodiphenyl disulfide and the disulfide bonds in the main chain of the polysulfide resin are fully Exchange, use thin-layer chromatography TLC to monitor the reaction process until the diaminodiphenyl disulfide raw material point completely disappears, cool to 60°C, add 5g hydrogen peroxide, and react for 12 hours under nitrogen protection to completely oxidize and couple the mercapto groups. Infrared spectroscopy 2562cm...
Embodiment 3
[0039] A kind of curing method of the toughened epoxy adhesive that can be reprocessed and recycled comprises the steps:
[0040] Step 1: Preparation of toughening agent aromatic amine-terminated polysulfide resin: Weigh 100g of mercapto-terminated liquid polysulfide resin with a relative molecular weight of 4000, 6.2g and 0.1g of 4,4′-diaminodiphenyl disulfide Add triethanolamine and 150 g of solvent dioxymethane into the reaction flask, stir and reflux under nitrogen protection, heat at 130 ° C, and react for 20 hours to fully exchange the disulfide bonds in the diaminodiphenyl disulfide with the disulfide bonds in the main chain of the polysulfide resin , use thin-layer chromatography TLC to monitor the reaction process until the diaminodiphenyl disulfide raw material point completely disappears, cool to 60 °C, add 5g hydrogen peroxide, and react for 12 hours under nitrogen protection to completely oxidize and couple the mercapto groups. Infrared spectroscopy Monitor mercap...
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