Variable-stiffness self-repairing material containing metal-sulfydryl coordinate bond as well as preparation and application thereof
A technology of self-healing materials and variable stiffness, applied in the direction of additive processing, adhesives, etc., can solve the problems of limited practical application fields, water vapor sensitivity, cumbersome synthesis steps, etc., and achieve good self-healing performance, simple steps, and excellent flexibility. Effect
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Embodiment 1
[0069] A variable stiffness self-healing material containing metal-mercapto coordination bonds and a preparation method thereof:
[0070] Add 50.00 g of pentaerythritol tetra-3-mercaptopropionate into the flask, then add 100 mL of dichloromethane as a solvent, control the reaction temperature at 25°C, stir at a speed of 100 r / min, and react for 30 minutes to obtain a mercapto-terminated compound solution;
[0071] Add 8.28g of triethylamine to the above-mentioned thiol-terminated compound solution, control the reaction temperature under sealed conditions at 25°C, stir at 200r / min, and react for 4h;
[0072] Add 0.30 g of pentaerythritol triacrylate to the above mixed system, control the reaction temperature under sealed conditions at 25°C, stir at a speed of 200r / min, and react for 6h;
[0073] Preparation of metal zinc salt solution: take 13.79g of zinc chloride, add 15mL of methanol as a solvent, and perform ultrasonic treatment for 2 hours at 25°C and ultrasonic power of 12...
Embodiment 2
[0078] A variable stiffness self-healing material containing metal-mercapto coordination bonds and a preparation method thereof:
[0079] Add 80.00g of trimethylolpropane tris(2-mercaptoacetate) and 19.83g of mercapto-terminated liquid polysulfide resin with a relative molecular mass of 1000 into the flask, then add 100mL of dichloromethane as a solvent, and control the reaction temperature at 25°C. The stirring speed was 150r / min, and the reaction was carried out for 30min to obtain the compound solution of the terminal mercapto group;
[0080] Add 20.00 g of triethanolamine to the above-mentioned mercapto-terminated compound solution, control the reaction temperature under sealed conditions at 25°C, stir at 250 r / min, and react for 4 hours;
[0081] Add 30.00 g of pentaerythritol triacrylate to the above mixed system, control the reaction temperature under sealed conditions at 25°C, stir at 200 r / min, and react for 6 hours;
[0082] Preparation of metal zinc salt solution: ...
Embodiment 3
[0088] Add 20.00g of 2,7-naphthyl dithiol and 4.16g of mercapto-terminated liquid polysulfide resin with a relative molecular mass of 4000 into the flask, then add 100mL of tetrahydrofuran as a solvent, control the reaction temperature at 25°C, stir at a speed of 180r / min, and react for 20min , to obtain a compound solution of a mercapto group;
[0089] Add 2.84g of N,N-dimethylbenzylamine to the above-mentioned mercapto-terminated compound solution, control the reaction temperature under sealed conditions at 25°C, stir at 250r / min, and react for 4 hours;
[0090] Add 7.72g of triphenylmethane triisocyanate to the above mixed system, control the reaction temperature under sealed conditions at 25°C, stir at 300r / min, and react for 6h;
[0091] Preparation of metal zinc salt solution: Take 7.12g of zinc sulfate, add 10mL of methanol as a solvent, and perform ultrasonic treatment for 1h at 25°C and ultrasonic power of 90W;
[0092] Preparation of other metal salt solutions: Take 4...
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