A kind of thermoplastic polyurethane elastomer and its preparation method and application
A thermoplastic polyurethane and elastomer technology, applied in the field of polyurethane, can solve problems such as independent research and development capabilities, innovation capabilities, and weak awareness of intellectual property protection, and achieve excellent mechanical properties and dimensional stability, enhanced strength and stability, and controllability strong effect
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Embodiment 1
[0063] (1) Take 20g of polytetrahydrofuran ether glycol with a molecular weight of 2000, 3.36g of hexamethylene diisocyanate, 0.1g of dibutyltin diacetate catalyst, dissolve in 20g of N,N-dimethylacetamide, 25g of dimethylmethylene In a mixed solvent of sulfone, stir mechanically in a nitrogen atmosphere at 60°C, and react for 6 hours to obtain a prepolymer solution;
[0064] (2) Take 10g of pyromellitic anhydride and 18g of ethanolamine and dissolve them in N,N-dimethylformamide at room temperature for 12 hours to generate an amic acid solution; then add toluene entrainer and raise the temperature to 170°C, Condensate and reflux for 6 hours, separate the generated water with a water separator; filter the product solution after settling in deionized water, and dry to obtain a chain extender with an imide ring structure terminated by hydroxyl groups at both ends;
[0065] (3) Titrate the content of the isocyanate group of the prepolymer solution described in step (1), and add t...
Embodiment 2
[0078] (1) Get 10g of polyethylene glycol with a molecular weight of 1000, 3.20g of p-phenylene diisocyanate, 0.1g of dibutyltin dilaurate catalyst, dissolve in 10g of N,N-dimethylformamide, 12g of dimethyl sulfoxide In the mixed solvent, stir mechanically in a nitrogen atmosphere at 60°C, and react for 8 hours to obtain a prepolymer solution;
[0079] (2) Take 8g of pyromellitic anhydride and 14g of ethanolamine and dissolve them in N,N-dimethylformamide at room temperature for 12 hours to generate an amic acid solution; then add toluene entrainer and raise the temperature to 170°C, Condensate and reflux for 6 hours, separate the generated water with a water separator; filter the product solution after settling in deionized water, and dry to obtain a chain extender with an imide ring structure terminated by hydroxyl groups at both ends;
[0080] (3) Titrate the content of the isocyanate group of the prepolymer solution described in step (1), and add the chain extender describ...
Embodiment 3
[0088] (1) Take 30g of polypropylene glycol with molecular weight of 3000, 3.20g of 1,3-phenylene diisocyanate, 0.2g of dibutyltin dilaurate catalyst, dissolve in 25g of N,N-dimethylformamide, 30g of dimethyl sulfoxide In the mixed solvent, stir mechanically in a nitrogen atmosphere at 65°C, and react for 7 hours to obtain a prepolymer solution;
[0089] (2) Take 20g of pyromellitic anhydride and 28g of ethanolamine and dissolve them in N,N-dimethylformamide at room temperature for 12 hours to generate an amic acid solution; then add toluene entrainer and raise the temperature to 170°C, Condensate and reflux for 6 hours, separate the generated water with a water separator; filter the product solution after settling in deionized water, and dry to obtain a chain extender with an imide ring structure terminated by hydroxyl groups at both ends;
[0090] (3) Titrate the content of the isocyanate group of the prepolymer solution described in step (1), and add the chain extender desc...
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