A kind of preparation method of polyurethane
A polyurethane and prepolymer technology, applied in the field of polymer material preparation, can solve the problems of reducing the physical properties of materials, serious smoke generation, and large additions, and achieve good bonding stability, improved product performance, and high regularity. Effect
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Embodiment 1
[0050] This example provides a thioether prepolymer using 1,4-dichloro-2-butene and H 2 S is a raw material, and using triethanolamine and diethylene glycol is a mixed solvent to carry out a polymerization reaction, and the reaction formula involved is as follows:
[0051]
[0052] The reaction process includes:
[0053] 1. All reagents used are dried with anhydrous sodium sulfate for 24 hours before use;
[0054] 2. Add 25g (0.2mol) of 1,4-dichloro-2-butene into a 1L autoclave, add 68g (0.4mol) of triethanolamine and 200mL of diethylene glycol to dissolve, and add a phase transfer catalyst lauryl three Methylammonium bromide 0.5g, continue to stir for 30min at room temperature, until the system is clarified;
[0055] 3. Pour dry H under pressure 2 4.5L of S gas is about 0.2mol, and the system pressure rises to 0.3MPa;
[0056] 4. The autoclave continues to stir and react for 2-3 hours at room temperature, and the system pressure drops to about 0.1 MPa and then starts t...
Embodiment 2
[0064] This embodiment provides a sulfide prepolymer, using dibromoethane and H 2 S is a raw material, and using triethanolamine and diethylene glycol is a mixed solvent to carry out a polymerization reaction, and the reaction formula involved is as follows:
[0065]
[0066] The reaction process includes:
[0067] 1. All reagents used are dried with anhydrous sodium sulfate for 24 hours before use;
[0068] 2. Add 37.6 g (0.2 mol) of dibromoethane to a 1L autoclave, add 68 g (0.4 mol) of triethanolamine and 200 mL of diethylene glycol to dissolve, and add a phase transfer catalyst lauryl trimethyl ammonium bromide 0.5 g, continue to stir for 30min at room temperature until the system is clarified;
[0069] 3. Pour dry H under pressure 2 4.5L of S gas is about 0.2mol, and the system pressure rises to 0.3MPa;
[0070] 4. The autoclave continues to stir and react for 2-3 hours at room temperature, and the system pressure drops to about 0.1 MPa and then starts to heat; the...
Embodiment 3
[0078] This embodiment provides a thioether prepolymer, which uses acetylene and thiol used in the vinyl chloride industry to carry out a polymerization reaction to prepare a thiol-terminated vinyl sulfide macromonomer.
[0079]
[0080] The reaction process includes: using a 1-liter high-pressure reactor, first adding 300 mL of mixed solvent of acetone and water (acetone: water=2:1), 0.5 g of photoinitiator Irgacure-1173, and feeding about 2 mol of acetylene 52 g under the air pressure of 2 MPa , after the acetone gas is absorbed and saturated, the air pressure tends to be stable; in the case of stirring, start to slowly pass in H 2 S gas 71.4g is about 2.1mol. After the pressure rises to about 1Mpa, the ultraviolet light is introduced into the reactor through the optical fiber through the observation hole, the high-pressure mercury lamp next to the reactor is turned on for 10min, and the reaction is continued for 1 hour at room temperature. The reaction has ended. Access...
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Abstract
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