Preparation method of polyurethane/styrene elastomer composite material
A technology of styrene elastomer and composite materials, which is applied in the field of preparation of polyurethane/styrene elastomer composite materials, can solve the problems of heat curing energy and solvent consumption, high processing molding temperature, short curing operation time, etc., and achieve product strength And the effect of fast mechanical properties, high production efficiency and low cost
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[0031] Implement the preparation method of a kind of polyurethane / styrene elastomer composite material provided by the present invention, at first be by synthesizing the isocyanate base polyurethane prepolymer of different mass content, and synthesize the end-blocking polyurethane prepolymer by adding ethylenic end-blocking agent Then, under the action of ultraviolet light and photoinitiator, the polyurethane prepolymer macromonomer and styrene monomer are free radically copolymerized at 5~15℃ to prepare polyurethane / styrene elastomers with different properties. composite material. The specific steps are as follows:
[0032] Firstly, a blocked polyurethane prepolymer is prepared. Add 100 parts of polyether polyol to the reactor in terms of parts by mass, keep a vacuum of 0.08-0.09 Mpa at 120°C, dehydrate for 2.5 hours, then cool down to 50°C, and add 18.5-52.0 parts of isocyanate, and then heated to 80 ° C, heat preservation reaction 2.5 h; then control the mass content of f...
Embodiment 1
[0043] (1) Synthesis of end-capped polyurethane prepolymer
[0044] Add 100 parts of polyether polyol N210 into the reactor by mass, and dehydrate for 2 hours at 120°C while maintaining a vacuum of 0.08-0.09 MPa. Then the temperature was lowered to 50°C, and 28.0 parts of TDI-80 toluene diisocyanate was added, and then the temperature was raised to 80°C for 2.5 hours of heat preservation reaction. A prepolymer with a free-NCO% mass content of 4.0% was obtained, and then a mixture of 16.60 parts of hydroxyethyl methacrylate and 0.50 parts of dibutyltin dilaurate was added dropwise to the reactor, and the reaction was carried out at 80°C for 2.5 h. Then degassing for 0.5 h while maintaining a vacuum of 0.8-0.9 MPa to obtain a blocked polyurethane prepolymer with an ethylenic double bond content of 0.088 mol / 100 g.
[0045] (2) Preparation of polyurethane / styrene elastomer composites
[0046] Weigh 100 parts of the above-mentioned blocked polyurethane prepolymer, 30 parts of st...
Embodiment 2
[0048] (1) Synthesis of end-capped polyurethane prepolymer
[0049] Add 100 parts of polyether polyol N210 into the reactor by mass, and dehydrate for 2 hours at 120°C and a vacuum of 0.08-0.09 MPa. Then, when the temperature was lowered to 50°C, 34.1 parts of TDI-80 toluene diisocyanate was added, and then the temperature was raised to 80°C for 2.5 hours. The mass content of free-NCO% was controlled to 6.0%, and a mixture of 26.15 parts of hydroxyethyl methacrylate and 0.56 parts of dibutyltin dilaurate was added dropwise to the reactor, and the reaction was kept at 70 °C for 3.5 h. Then degassing for 0.5 h while maintaining a vacuum degree of 0.8-0.9 MPa to obtain a blocked polyurethane prepolymer with an ethylenic double bond content of 0.125 mol / 100 g.
[0050] (2) Preparation of polyurethane / styrene elastomer composites
[0051] Weigh 100 parts of polyurethane end-capped prepolymer, 60 parts of styrene and 0.36 parts of 2-hydroxy-2-methyl-1-phenyl-1-acetone photoinitiat...
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