Multi-crosslinking polyurethane elastomer and preparation method thereof
A polyurethane elastomer and polyurethane prepolymer technology, applied in the field of polymer materials, can solve the problems of difficult control of polyurethane quality, weak controllability of synthesis process, and uneven synthesis process, so as to improve crosslinking density, phase Good capacitance and excellent mechanical properties
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[0038] The embodiment of the present invention also provides a preparation method of the above-mentioned multi-crosslinking polyurethane elastomer, which comprises:
[0039] S1. The polyisocyanate and the polyether polyol are mixed and reacted to obtain a polyurethane prepolymer.
[0040] S2. Mix and react the polyurethane prepolymer with the polyhydroxy macromolecular crosslinking agent and the small molecular chain extender.
[0041] Further, the temperature of the mixed reaction of the polyisocyanate and the polyether polyol is 70-100° C., and the reaction time is 2-5 h. The temperature of the mixed reaction of the polyurethane prepolymer with the polyhydroxy macromolecular cross-linking agent and the small molecular chain extender is room temperature, and the reaction time is 1-3 hours. The inventor found through his own creative work that the reaction within the above temperature range has a better cross-linking reaction effect, which is beneficial to obtain a polyuretha...
Embodiment 1
[0045] The present embodiment provides a polyhydroxy macromolecular cross-linking agent, and its preparation method is as follows:
[0046] S1. 4.8 mmol of organic ligand (2,2'-bipyridine), 72 mmol of first acrylate monomer (methyl acrylate), 8 mmol of second acrylate monomer (hydroxyethyl acrylate) were dissolved in tetrahydrofuran.
[0047] S2. Add 1.6 mmol of metal compound (CuCl) and 1.6 mmol of initiator (ethyl 2-bromopropionate), and react at 80° C. for 6 h.
[0048] S3. Quenching the reaction at -15°C, passing the product through a neutral alumina chromatography column, and using tetrahydrofuran as the eluent to remove the catalyst in the product.
[0049] S4. concentrated by rotary evaporation, and precipitated in industrial ethanol.
[0050] S5. The precipitated product was dried in a vacuum drying oven at 40°C for 48h to obtain a white powder product (yield 95.1%, M n =7621, molecular weight distribution M n / M w = 1.24. )
Embodiment 2
[0052] The present embodiment provides a polyhydroxy macromolecular cross-linking agent, and its preparation method is as follows:
[0053] S1. 4.8 mmol of the organic ligand (pentamethyldiethylenetriamine), 64 mmol of the first acrylate monomer (methyl acrylate), and 16 mmol of the second acrylate monomer (hydroxypropyl acrylate) were dissolved in tetrahydrofuran.
[0054] S2. Add 1.6 mmol of metal compound (CuCl) and 1.6 mmol of initiator (chloroacetonitrile), and react at 80° C. for 6 h.
[0055] S3. Quenching the reaction at -15°C, passing the product through a neutral alumina chromatography column, and using tetrahydrofuran as the eluent to remove the catalyst in the product.
[0056] S4. concentrated by rotary evaporation, and precipitated in industrial ethanol.
[0057] S5. The precipitated product was dried in a vacuum drying oven at 40°C for 48h to obtain a white powder product (yield 95.4%, M n =7903, molecular weight distribution M n / M w = 1.16. )
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Abstract
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