Method for preparing polyurethane hot melt adhesive, polyurethane hot melt adhesive and processed products
A technology of polyurethane hot melt adhesive and polyester diol, applied in the field of preparation of polyurethane hot melt adhesive, polyurethane hot melt adhesive and processed products, can solve the adverse effects of polyurethane hot melt adhesive on mechanical properties or safety, increase cost and process Complexity, viscosity reduction and other issues, to achieve the effect of improving melt fluidity, high application value and low cost
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Embodiment 1
[0028] The raw material molar ratio of the hot melt adhesive prepared in this example is: isocyanate group: hydroxyl group in polyester diol: chain extender = 1: 0.8: 0.1; the amount of the catalyst accounts for 0.05% of the total mass of raw materials.
[0029] Among them, the isocyanate is 4,4-diphenylmethane diisocyanate; the polyester diol is polyethylene adipate diol with a molecular weight of 2000; the chain extender is dimethylglyoxime; the catalyst is dilaurate di Butyl tin.
[0030] Its preparation process comprises the following steps:
[0031] (1) Synthesis of prepolymer: put polyethylene adipate diol at 120° C. for 2 hours in vacuum dehydration, and cool to room temperature. Mix 4,4-diphenylmethane diisocyanate and dehydrated polyethylene adipate diol according to the molar ratio of isocyanate group to hydroxyl group of 1:0.8, put it into the reactor, and start stirring while feeding nitrogen, and raise the temperature At 80°C, add dibutyltin dilaurate with a mas...
Embodiment 2
[0033] Example 2: The raw material molar ratio of the hot melt adhesive prepared in this example is: isocyanate group: hydroxyl group in polyester diol: chain extender = 1:0.8:0.1; the amount of catalyst accounts for 0.1% of the total mass.
[0034] Wherein, the isocyanate is 4,4-diphenylmethane diisocyanate; the polyester diol is polycarbonate diol with a molecular weight of 3000; the chain extender is dimethylglyoxime; the catalyst is dibutyltin dilaurate.
[0035] Its preparation process comprises the following steps:
[0036] (1) Synthesis of prepolymer: place polycarbonate diol at 120° C. for vacuum dehydration for 2 hours, and cool to room temperature. Mix 4,4-diphenylmethane diisocyanate and dehydrated polycarbonate diol according to the molar ratio of isocyanate group to hydroxyl group of 1:0.8, put it into the reactor, feed nitrogen gas and start stirring at the same time, raise the temperature to 90°C, add Dibutyltin dilaurate with a total reactant mass of 0.05% was...
Embodiment 3
[0039] The raw material molar ratio of the hot melt adhesive prepared in this example is: isocyanate group: hydroxyl group in polyester diol: chain extender = 1: 0.7: 0.15; the amount of catalyst used is 0.08% of the total mass of raw materials.
[0040] Wherein, the isocyanate is 4,4-diphenylmethane diisocyanate; the polyester diol is polybutylene adipate diol with a molecular weight of 2000; the chain extender is dimethylglyoxime; and the catalyst is stannous octoate.
[0041] Its preparation process comprises the following steps:
[0042] (1) Synthesis of prepolymer: place polybutylene adipate diol at 120° C. for vacuum dehydration for 2 hours, and cool to room temperature. Mix 4,4-diphenylmethane diisocyanate and dehydrated polybutylene adipate diol according to the molar ratio of isocyanate group to hydroxyl group of 1:0.7, put it into the reactor, and start stirring while feeding nitrogen, and raise the temperature At 80° C., add stannous octoate with a total reactant mas...
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