Preparation method of star-structure water-based polyurethane adhesive
A water-based polyurethane, star structure technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of uneven reaction, difficult to control, long time, etc., to achieve good mechanical properties, saving Production cost, good stability effect
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Embodiment 1
[0021] Using IPDI and PCL as raw materials, DBTDL as a catalyst, adding an appropriate amount of acetone, reacting at 70°C for 1.5h, the R value is 2.5, and the relative molecular mass of PCL is 1500. Add DMPA, DMPA accounts for 3% of the mass of the prepolymer, and react for 2 hours. Cool down to 50°C, add TEA to neutralize the reaction to form a salt, react for 15 minutes, and the molar ratio of TEA to DMPA is 1:1. Cool down to room temperature, add an aqueous solution of EDA for emulsification and chain extension for 1 hour, the amount of EDA used is 0.2% of the mass of the prepolymer, and the amount of water used is twice the total mass of the prepolymer. Finally, the acetone was distilled off under reduced pressure to obtain a star-shaped water-based polyurethane adhesive.
Embodiment 2
[0023] Using IPDI and PCL as raw materials, DBTDL as a catalyst, adding an appropriate amount of acetone, reacting at 70°C for 1.5h, the R value is 2.5, and the relative molecular mass of PCL is 1500. Add DMPA, DMPA accounts for 4% of the mass of the prepolymer, and react for 2 hours. Cool down to 50°C, add TEA to neutralize the reaction to form a salt, react for 15 minutes, and the molar ratio of TEA to DMPA is 1:1. Cool down to room temperature, add an aqueous solution of EDA for emulsification and chain extension for 1 hour, the amount of EDA used is 0.2% of the mass of the prepolymer, and the amount of water used is twice the total mass of the prepolymer. Finally, the acetone was distilled off under reduced pressure to obtain a star-shaped water-based polyurethane adhesive.
Embodiment 3
[0025] Using IPDI and PCL as raw materials, DBTDL as a catalyst, adding an appropriate amount of acetone, reacting at 70°C for 1.5h, the R value is 2.5, and the relative molecular mass of PCL is 1500. Add DMPA, DMPA accounts for 5% of the mass of the prepolymer, and react for 2 hours. Cool down to 50°C, add TEA to neutralize the reaction to form a salt, react for 15 minutes, and the molar ratio of TEA to DMPA is 1:1. Cool down to room temperature, add an aqueous solution of EDA for emulsification and chain extension for 1 hour, the amount of EDA used is 0.2% of the mass of the prepolymer, and the amount of water used is twice the total mass of the prepolymer. Finally, the acetone was distilled off under reduced pressure to obtain a star-shaped water-based polyurethane adhesive.
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