A kind of preparation method of star structure water-based polyurethane adhesive
A water-based polyurethane and star-shaped structure technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as difficult control, long time, uneven reaction, etc., to save production costs, good Mechanical properties, the effect of solving uneven response
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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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