A preparation method of a polyurethane/epoxy resin composite material
A technology of epoxy resin and composite materials, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., which can solve the problems of reduced bond strength, limited adhesion and heat resistance, poor high temperature resistance, etc. problems, to achieve the effect of improving bonding performance, improving rigidity and comprehensive mechanical properties
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[0028] To implement a polyurethane / epoxy resin composite material provided by the present invention, that is, a method for preparing a polyurethane / epoxy resin composite adhesive material, firstly, by synthesizing isocyanate-based polyurethane prepolymers with different mass contents to obtain A The components, and then the preparation of the dibasic aromatic amine-terminated epoxy resin E-44 to obtain the curing agent B component, and finally the A and B components are mixed in a certain proportion and cured to obtain a polyurethane / epoxy composite adhesive 剂材料。 Agent materials. The specific steps are as follows (the feeding amount is calculated by mass fraction):
[0029] (1) Synthesis of MDI-50 polyurethane prepolymer with NCO end-blocking
[0030] Add 100 parts of polyether polyol N210 into the reactor according to mass parts, and dehydrate for 2.5 h while maintaining a vacuum of 0.08~0.09 MPa at 120℃; then reduce the temperature to 50℃, add 52.2~77.9 parts of diisocyanate, and...
Example Embodiment
[0063] Example 1
[0064] (1) Synthesis of MDI-50 polyurethane prepolymer with NCO end-blocking
[0065] Add 100 parts of polyether polyol N210 into the reactor according to mass parts, and dehydrate for 2.5 h while maintaining a vacuum degree of 0.08~0.09 MPa at 120℃; then reduce the temperature to 50℃, add 52.2 parts of diisocyanate, and then increase the temperature to 80℃ Incubate for 2.5 h; when the mass content of free-NCO% is controlled to 6.0%, then defoam for 0.5 h under a vacuum degree of 0.8~0.9 MPa to obtain -NCO-terminated MDI-50 with a mass content of 6.0% free-NCO% Polyurethane prepolymer, called A component.
[0066] (2) Synthesis of binary aromatic amine-terminated epoxy resin E-44
[0067] Accurately weigh 272 parts of TX-2 dibasic aromatic amine in a four-necked bottle. After the temperature is raised to 65±2℃, add 257 parts of E-44 liquid epoxy resin dropwise, keep it for 4 to 5 hours, and then the temperature Raise to 80±2℃, continue to react for 4h, get -NH 2 T...
Example Embodiment
[0070] Example 2
[0071] (1) Synthesis of MDI-50 polyurethane prepolymer with NCO end-blocking
[0072] Add 100 parts of polyether polyol N210 into the reactor according to mass parts, and dehydrate for 2.5 h while maintaining a vacuum of 0.08~0.09 MPa at 120°C; then reduce the temperature to 50°C, add 77.9 parts of diisocyanate, and then increase the temperature to 80°C Heat preservation reaction for 2.5 h; when the mass content of free-NCO% is controlled to 10.0%, then defoaming for 0.5 h under 0.8-0.9 MPa vacuum to obtain -NCO-terminated MDI-50 with a mass content of free-NCO% of 10.0% Polyurethane prepolymer, called A component.
[0073] (2) Synthesis of binary aromatic amine-terminated epoxy resin E-44
[0074] Accurately weigh 272 parts of dibasic aromatic amine TX-2 in a four-necked flask, after heating to 65±2℃, add 257 parts of E-44 liquid epoxy resin dropwise, keep for 4 to 5 hours, and then the temperature Raise to 80±2℃, continue to react for 4h, get -NH 2 The blocked c...
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