A two-component polyurethane adhesive that can withstand high temperature cooking at 121°C and its preparation and use methods
A two-component polyurethane, high-temperature cooking technology, applied in the field of adhesives, can solve the problems of high cost, inability to withstand high-temperature cooking, unfavorable development of national industries, etc., and achieve low cost of use, wide range of uses, and good polarity.
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Embodiment 1
[0028] A component:
[0029] Add 40.5g of isocyanate in the reaction kettle, drop 22g of polyester with a molecular weight of 1500 at 35°C at a rate of 300kg / h, and keep the temperature at 45°C for 3 hours after the addition; add 18gPPG2000 at a rate of 280kg / h at 35°C, After the dropwise addition, continue the reaction at 35°C for 2.5 hours to obtain component A;
[0030] B component:
[0031] Add 1 mol of castor oil, 1 mol of ethylene glycol, 1.5 mol of neopentyl glycol, and 0.5 mol of glycerol into the reactor, and alcoholyze at 220°C for 3 hours under the catalysis of 100ppm lithium hydroxide, then add 3 mol of sebacic acid to esterify at 230°C for 14 Hours until the acid value is less than 5mgKOH / g, the hydroxyl value is 130mgKOH / g, cooled to 100°C and released for packaging.
[0032] According to the mass ratio of component A: component B = 100:62, it is coated on the bonded material by a solvent-free laminating machine, and cured at 45°C for 68 hours to obtain a two-c...
Embodiment 2
[0034] A component:
[0035] Add 19g of isocyanate in the reaction kettle, add dropwise 21g of polyester with a molecular weight of 1500 at 40°C at a rate of 310kg / h, and keep the temperature at 45°C for 4 hours after the addition; add 17.14gPPG2000 dropwise at 40°C at a rate of 280kg / h, Continue the reaction at 40°C for 2.5h after the dropwise addition, continue to add 36gPPG1000 dropwise at a rate of 280kg / h, keep the temperature at 50°C for 3h after the dropwise addition, cool down to 45°C and discharge.
[0036] Component B: Add 1 mol castor oil, 1 mol ethylene glycol, 1.5 mol neopentyl glycol, and 0.5 mol glycerin to the reaction kettle, and alcoholyze at 240°C for 2.5 hours under the catalysis of 100 ppm lithium hydroxide, then add 2 mol sebacic acid, 1 mol Terephthalic acid, esterified at 220°C for about 15 hours until the acid value is less than 5mgKOH / g, the hydroxyl value is 130mgKOH / g, cooled to 100°C and released for packaging.
[0037] According to the mass ratio...
Embodiment 3
[0039] A component:
[0040] Add 40.5g of isocyanate in the reaction kettle, drop 22g of polyester with a molecular weight of 1500 at 45°C, the drop rate is 295kg / h, and keep the temperature at 45°C for 4 hours after the addition; add 18gPPG2000 dropwise at 45°C, and the drop rate is 280kg / h h, continue the reaction at 45°C for 2.5h after the dropwise addition, and obtain component A;
[0041] Component B: Add 1 mol castor oil, 1 mol ethylene glycol, 1.5 mol neopentyl glycol, and 0.5 mol glycerin to the reaction kettle, and alcoholyze at 240°C for 3.5 hours under the catalysis of 100 ppm lithium hydroxide, then add 3 mol sebacic acid, 1 mol Phthalic acid, esterified at 230°C for about 16 hours until the acid value is less than 5mgKOH / g, the hydroxyl value is 130mgKOH / g, cooled to 100°C and released for packaging.
[0042] Mix according to the mass ratio of component A: component B = 100:85, then apply it to the bonded material through a solvent-free laminating machine, and cu...
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