Reprocessed polyurethane with dual-dynamic covalent bond crosslinking and preparation method of reprocessed polyurethane
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A technology of dynamic covalent bonding and heavy processing, which is applied in the direction of additive processing, etc., can solve problems that have not been seen, and achieve the effect of improving mechanical properties
Inactive Publication Date: 2017-08-11
SICHUAN UNIV
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Problems solved by technology
[0004] So far, it has not been seen that a small molecule containing both DA bonds and disulfide bonds is used as a modified chain extender, and is directly introduced into the polyurethane molecular chain during the polymerization process to prepare intrinsic self-healing polyurethane.
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Embodiment 1
[0027] (1), under the protection of an inert gas, 50g of toluene diisocyanate (TDI), 500g of polycaprolactone diol with a molecular weight of 2000 and 2g of dibutyltin dilaurate catalyst are added in proportion to the reactor, and the temperature is raised to 70~ 90°C, stirring and reacting for 0.5~2h;
[0028] (2), add 300 ml dioxane solution of 135g amino-terminated dynamic bond chain extender and 40g HDI trimer crosslinking agent to the product in (1), under the protection of inert gas, react at 45~90°C for 2~ After 72h, a reprocessable polyurethane with self-healing properties was obtained.
Embodiment 2
[0030] (1) Under the protection of an inert gas, add 38g of isophorone isocyanate (IPDI), 400g of polypropylene glycol with a molecular weight of 2000 and 2.5g of dibutyltin dilaurate catalyst into the reactor in proportion, and heat up to 70-90°C , stirring and reacting for 0.5 to 2 hours;
[0031] (2), add a mixed melt of 30g of amino-terminated dynamic bond chain extender and 42g of HDI trimer crosslinking agent to the product in (1), and react at 45-90°C for 2-72h under the protection of an inert gas to obtain Reworkable polyurethane with self-healing properties.
Embodiment 3
[0033] (1), under the protection of inert gas, 78g xylylene diisocyanate (XDI), 450g molecular weight are polytetrahydrofuran glycol of 2000 and 2.2g dibutyltin dilaurate catalyst are added in the reactor in proportion, heat up to 70-90°C, stirring for 0.5-2 hours;
[0034] (2), add the mixed dioxane solution of 72g amino-terminated dynamic bond chain extender and 40g TDI trimer cross-linking agent to the product in (1), under the protection of inert gas, 45~90 ℃ react 2~ After 72h, a reprocessable polyurethane with self-healing properties was obtained.
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Abstract
The invention relates to reprocessed polyurethane with dual-dynamic covalent bond crosslinking and a preparation method of the reprocessed polyurethane, and belongs to the field of high-molecular materials. Diisocyanate, triisocyanate or tetraisocyanate, macromolecular polyol/amine and dihydric alcohol/amine chain extenders with dynamically reversible Diels-Alder bonds and disulfide bonds are melted and commixed under the action of a catalyst or polymerized after addition of solvent to obtain the reprocessed polyurethane. Dual-dynamic bonds are introduced, so that the requirements of materials for mechanical properties are met, the materials have excellent reprocessing and self-repairing properties in different application environments, and the chain extenders with dynamically reversible Diels-Alder bonds and disulfide bonds can fracture and recombine at a certain temperature, so that the polyurethane materials have reprocessing performance and self-repairing functions on cracks or damage generated in the use process. Material viscosity obviously reduces after the dynamic bonds fracture, and melt viscosity is remarkably improved, so that processing performance is improved.
Description
technical field [0001] The invention relates to a reprocessable polyurethane containing double dynamic covalent bond crosslinks and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] As a polymer with adjustable and controllable structure, polyurethane is widely used in various fields. Like all materials, it is inevitable that it will be damaged due to external influences during the application process. Therefore, it has become a hot topic that polyurethane materials have self-healing functions. There are many ways for polymer self-healing, and the intrinsic self-healing mechanism without adding external repairing agents is the most ideal repair mechanism, among which introducing thermally reversible covalent bonds into the polymer material structure is a simple and effective method. After the material is damaged, the effect of repairing the material damage can be achieved through simple heat treatment, which not only ha...
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Application Information
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