Low softening point thermoplastic polyurethane hot melt adhesive and preparation method thereof
A thermoplastic polyurethane, low softening point technology, used in the field of polymer adhesives, can solve the problem of less attention to hot melt adhesives, and achieve the effects of reducing cohesive energy, mild reaction conditions, and reducing intermolecular forces
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Embodiment 1
[0027] Add 100g of polyethylene glycol (molecular weight: 1000) and 800g polyethylene glycol (molecular weight: 8000) into the reaction kettle, raise the temperature to 100°C-112°C under nitrogen protection, dehydrate until no water evaporates, and cool down to 65°C.
[0028] Weigh 48.5g of 4,4'-diphenylmethane diisocyanate MDI according to the amount of the substance being 0.97 times the amount of the hydroxyl substance in polyethylene glycol, melt it and evenly add it to the reactor within 2h, and control the The reaction temperature is 110°C-118°C, and the reaction is 3h.
[0029] Add 2.48 g of chain extender ethylene glycol according to the amount of the substance being 0.2 times the amount of the polyethylene glycol substance; stop heating after 1 hour of reaction, and discharge the material to obtain a polyurethane hot melt adhesive. The softening temperature of the hot melt adhesive is 70°C, and the bonding shear strength to aluminum Ly-12 is 4.2MPa.
Embodiment 2
[0031] Add 194g of polyethylene glycol (molecular weight 2000) and 6g polytetrahydrofuran glycol PTMG (molecular weight 1000) into the reaction kettle, raise the temperature to 110°C-115°C under nitrogen protection, dehydrate until no water evaporates, and cool down to 60°C.
[0032] The amount of the substance is 0.98 times the sum of the hydroxyl substances in polyethylene glycol and polytetrahydrofuran diol. Weigh 17.6 g of toluene diisocyanate TDI, and add it into the reactor evenly within 2.5 hours. After the addition, control the reaction temperature to 112 ℃~120℃, react for 2h.
[0033] Add 1.28 g of chain extender diethylene glycol according to the amount of the substance being 0.2 of the sum of the amounts of the polyethylene glycol and polytetrahydrofuran glycol; stop heating after 45 minutes of reaction, and discharge to obtain a polyurethane hot melt adhesive. The softening temperature of the hot melt adhesive is 72°C, and the bonding shear strength to aluminum Ly-...
Embodiment 3
[0035] Add 190g of phthalic anhydride polyester polyol (molecular weight 2000) and 10g polytetrahydrofuran glycol PTMG (molecular weight 1000) into the reaction kettle, raise the temperature to 120℃~126℃ under the protection of nitrogen, dehydrate until no water evaporates, and cool down to 68℃.
[0036] The amount of the substance is 1.01 times the sum of the amount of hydroxyl substances in phthalic anhydride polyester polyol and polytetrahydrofuran diol. Weigh 26.5g of 4,4'-diphenylmethane diisocyanate MDI, melt it and add it into the reaction evenly within 3h In the kettle, control the reaction temperature at 110°C to 116°C after the feeding is completed, and react for 2.5 hours.
[0037] The amount of the substance is 0.25 times of the sum of the amount of the phthalic anhydride polyester polyol and polytetrahydrofuran diol, and the chain extender ethylene glycol is added; the reaction is stopped for 25 minutes, and the heating is stopped, and the polyurethane hot melt adh...
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