Polyurethane adhesive and preparation method thereof
A polyurethane adhesive and polyester polyol technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve environmental and human injury, safety hazards and other problems, achieve less material, The effect of low odor and wide range of raw material sources
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Embodiment 1
[0040] A preparation method of polyurethane adhesive, comprising the following steps:
[0041] (1) Preparation of component A
[0042] First, 10 parts of castor oil-based polyether polyol, 30 parts of aromatic polyester polyol, 7 parts of aliphatic polyol, 3 parts of polyester polyol with a functionality greater than 2, and 1 part of chain extender Add 0.5 parts of antioxidant into the reaction kettle, and heat to 55-60°C, then add 6.5 parts of toluene diisocyanate, heat to 70-90°C, react for 2-4h, cool down to 45-60°C, add 2.2 parts chain extender, then add 4.5 parts of diphenylmethane diisocyanate, raise the temperature to 70-90 ° C, react for 1-2 hours, add 0.02 parts of catalyst, continue the reaction for 6-8 hours, cool down to 40-60 ° C, add 25 parts Environmentally friendly solvent, diluted to the required index, that is, A component;
[0043] (2) Preparation of component B
[0044] Completely dissolve glycerin, trimethylolpropane, antioxidant and ethyl acetate at 40...
Embodiment 2
[0050] A preparation method of polyurethane adhesive, comprising the following steps:
[0051] (1) Preparation of component A
[0052]First, 15 parts of castor oil-based polyether polyol, 28 parts of aromatic polyester polyol, 12 parts of aliphatic polyol, 5 parts of polyester polyol with a functionality greater than 2, and 0.3 parts of antioxidant Add 1.5 parts of chain extender to the reactor, heat to 55-60°C, then add 5.5 parts of toluene diisocyanate, heat to 70-90°C, react for 2-4h, cool down to 45-60°C, add chain extender 2.2 parts, then add 5.5 parts of diphenylmethane diisocyanate, raise the temperature to 70-90°C, react for 1-2h, add 0.1 part of catalyst, continue the reaction for 6-8h, cool down to 40-60°C, add 28 parts of environmental protection Dilute with solvent, check the viscosity after dilution, add 0.5 parts of propylene glycol after the viscosity reaches 10,000-20,000 cps / 25°C, and mix well to obtain component A;
[0053] (2) Preparation of component B
...
Embodiment 3
[0060] A preparation method of polyurethane adhesive, comprising the following steps:
[0061] (1) Preparation of component A
[0062] First 20 parts of castor oil-based polyether polyols, 22 parts of aromatic polyester polyols, 6 parts of aliphatic polyols, 7 parts of polyester polyols with a functionality greater than 2, 0.8 parts of chain extenders and Add 0.8 parts of antioxidant into the reaction kettle, and heat to 55-60°C, then add 8.5 parts of toluene diisocyanate, and heat to 70-90°C, react for 2-4h, cool down to 45-60°C, add chain extender Add 4.2 parts of diphenylmethane diisocyanate, then add 2.5 parts of diphenylmethane diisocyanate, raise the temperature to 70-90 ° C, react for 1-2 hours, add 0.05 parts of catalyst, continue the reaction for 6-8 hours, cool down 40-60 ° C, add 32 parts Dilute with environmentally friendly solvents, check the viscosity after dilution, add 0.5 parts of ethylene glycol end-capping agent after the viscosity reaches 1-20,000 cps / 25°C...
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