Preparation method of hyperbranched polyurethane/polyacrylate damping material
A technology of hyperbranched polyurethane and polyacrylate, which is applied in the field of preparation of hyperbranched polyurethane/polyacrylate damping materials, can solve the problems of unreported hyperbranched polyurethane/polyacrylate LIPN, etc., and is beneficial to large-scale production, The effect of low viscosity and easy availability of raw materials
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Embodiment 1
[0034] The present invention will be further described below in conjunction with embodiment. The content involved in the present invention is not limited to the following examples. Embodiment 1: Preparation of hydroxyl-terminated hyperbranched polyurethane
[0035] 1. The composition of each raw material is as follows in terms of parts by mass:
[0036]
[0037] 2. Specific preparation process:
[0038] Weigh IPDI and DMPA and dissolve in N,N′-dimethylformamide (DMF), stir evenly, pass nitrogen into the system, remove the air in the system, raise the temperature to 85°C for 1.5h, then cool down to -5~0 ℃, slowly drop the DMF solution of DEOA, continue to stir for 30min after the dropwise addition, then raise the temperature to 60℃ for 2.0h, and obtain hyperbranched polyurethane (HBPU) through vacuum distillation. Its number average molecular weight was determined to be 3912 by vapor pressure osmosis (VPO).
Embodiment 2
[0040] Each raw material is constituted as follows by mass parts:
[0041]
[0042] 1. Preparation of polyurethane prepolymer
[0043] Add TDI and N210 (relative molecular mass 1000) into the three-necked flask, pass nitrogen to remove the air in the system, react at 80°C for 2.5 hours, then add DMPA and BDO, react at 75°C for 2.5 hours; cool down to 60°C, add HEMA Partial end-capping reaction was carried out for 1.5 hours to obtain a polyurethane prepolymer.
[0044] 2. Preparation of hyperbranched waterborne polyurethane prepolymer
[0045] Add HBPU to the polyurethane prepolymer prepared in step 2, react at 75°C for 2 hours to obtain a hyperbranched waterborne polyurethane prepolymer, and add a small amount of acetone to reduce the viscosity of the system.
[0046] 3. Polymerization reaction
[0047] Add 1 / 3 of St and 1 / 3 of BA to the hyperbranched polyurethane prepolymer prepared in step 2 below 45°C, stir for 20 minutes, add TEA for neutralization reaction for 15 mi...
Embodiment 3
[0050] Each raw material is constituted as follows by mass parts:
[0051]
[0052] The preparation method is the same as in Example 2.
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