A kind of polyurethane structural adhesive and preparation method thereof
A technology of structural adhesive and polyurethane, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve the problems of irritating odor, slow curing speed, low bonding strength, etc., and achieve easy The effect of fast handling, fast curing and enhanced flexibility
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[0052](1) Preparation of organotin silane reagent: Add 8.0g of 3-chloropropyltriethoxysilane, 3.0g of magnesium powder, 200ml of ether and several grains of iodine into a two-necked flask, heat and reflux for 120min under nitrogen protection, and statically After placing, the supernatant was poured into another two-necked flask, and 17.0 g of anhydrous SnCl was added dropwise under nitrogen protection. 4 After fully reacting, add excess magnesium powder, heat to reflux for 5 hours, and filter to obtain a colorless or light yellow organotin silane reagent solution A.
[0053] (2) Preparation of mesoporous silica: add 4.0g polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) to 120g 1.6mol L -1 In the HCl solution, after stirring overnight, add 8.5g ethyl orthosilicate, crystallize in a 100°C hydrothermal kettle for 24h, filter, wash, dry at 120°C for 12h, and use solvent extraction (ethanol, 5d) and roasting method ( 550° C., 5h) to remove the te...
Embodiment 1
[0056] (1) The preparation method of the first component is: add 100 parts of vegetable oil polyols (derived from peanut oil, with a hydroxyl value of 140 mgKOH / g) and 10 parts of trimethylolpropane into the reactor and heat to 110 ° C, and Stir and dehydrate for 2 hours under vacuum ≤ -0.09Mpa, the speed is 1200r / min, then cool down to below 60°C, transfer to the stirring motor, the speed is 1200r / min, then add 15 parts of plasticizer Ⅰ, 3 parts KH-560, 3 parts of KH-550, 4 parts of organotin immobilized on silica, and 2 parts of molecular sieve were stirred for 30 minutes under a vacuum degree ≤ -0.09Mpa, and the material was discharged to obtain the first component;
[0057] (2) The preparation method of the second component is: add toluene diisocyanate (TDI): polymethylene polyphenyl polyisocyanate (PAPI) = 7:3 into the mixer at a speed of 1200r / min. Stir for 30min at -0.09Mpa, discharge to obtain the second component;
[0058] (3) Use of sizing: Mix the first component a...
Embodiment 2
[0060] (1) The preparation method of the first component is: add 100 parts of vegetable oil polyol (derived from sesame oil, the hydroxyl value is 130mgKOH / g) and 5 parts of 1,4-butanediol into the reaction kettle and heat to 100°C , and stirred and dehydrated for 1 hour at a vacuum degree ≤ -0.09Mpa at a speed of 1000r / min, then cooled to below 60°C, transferred to the stirring motor at a speed of 1100r / min, and then added 10 parts of plasticizer Ⅰ, 2 parts of KH-560, 2 parts of KH-550, 2 parts of organotin immobilized on silica, and 1 part of calcium oxide were stirred for 20 minutes under a vacuum degree ≤ -0.09Mpa, and the material was discharged to obtain the first component;
[0061] (2) The preparation method of the second component is: add toluene diisocyanate (TDI) into the mixer, the rotation speed is 1100r / min, under the vacuum degree ≤ -0.09Mpa, stir for 20min, and discharge to obtain the second component;
[0062] (3) Use of sizing: Mix the first component and the...
PUM
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