Heterogeneous modified EP/HTPB (epoxy resin/hydroxyl-terminated polybutadiene) polyurethane material and preparation method thereof
A polyurethane material, heterogeneous technology, applied in the field of polyurethane materials, can solve the problems of low bonding strength, poor mechanical properties and heat resistance, etc., and achieve the effect of good performance advantages
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Embodiment 1
[0044] Preparation of epoxy-free polyurethane materials
[0045] The first step is to prepare polyether cyanate prepolymer
[0046]Weigh 13.15 g of toluene 2,4-diisocyanate (TDI) and 5 g of ethyl acetate into a 250 ml three-necked flask, and dissolve another 5 g of polyether N403 in 5 g of ethyl acetate, and use a constant pressure dropping funnel to Add dropwise to a three-necked flask, stir and react in an ice-water bath for 4 h;
[0047] The second step is to prepare the finished product
[0048] Weigh 49.77 g of HTPB, pour it into the polyether cyanate prepolymer prepared in the first step, stir evenly at room temperature, and after standing without delamination, depressurize and pump air bubbles, pour it into a glass template, and heat it at 50 Cure and mold in a constant temperature box.
[0049] The obtained product has a tensile strength of 4.84 MPa, an elongation at break of 102%, a glass substrate surface water contact angle of 83°, and an air surface water contac...
Embodiment 2
[0051] Preparation of Polyurethane Materials Containing Unmodified Epoxy Resins
[0052] The first step is to prepare polyether cyanate prepolymer
[0053] Weigh 13.15 g of toluene 2,4-diisocyanate (TDI) and 5 g of ethyl acetate into a 250 ml three-necked flask, and dissolve another 5 g of polyether N403 in 5 g of ethyl acetate, and use a constant pressure dropping funnel to Add dropwise to a three-necked flask, and stir the reaction in an ice-water bath for 4 h.
[0054] The second step is to prepare the finished product
[0055] Weigh 44.79 g of HTPB and 1.47 g of epoxy resin E-44, mix the two evenly, pour them into the polyether cyanate prepolymer prepared in the first step, stir evenly at room temperature, and wait to stand still After layering, depressurize and pump air bubbles, pour it into a glass template, and solidify it in a constant temperature box at 50 °C.
[0056] The obtained product has a tensile strength of 5.09 MPa, an elongation at break of 110.11%, a gla...
Embodiment 3
[0058] Preparation of Polyurethane Material Containing 10% of Organic Acid Modified Epoxy Resin
[0059] The first step is to prepare organic acid modified epoxy resin
[0060] Weigh 30 g of bisphenol A epoxy resin E-44 and add it to a 100 ml three-neck flask, stir it mechanically and heat it to 70°C to melt it completely, add 4 drops of N,N-dimethylformamide as a catalyst, add 11.63 g n-butyric acid, stirred and reacted at 110-120°C for 4-4.5 h;
[0061] The second step is to prepare polyether cyanate prepolymer
[0062] Weigh 13.15 g of toluene 2,4-diisocyanate (TDI) and 5 g of ethyl acetate into a 250 ml three-necked flask, and dissolve another 5 g of polyether N403 in 5 g of ethyl acetate, and use a constant pressure dropping funnel to Add dropwise to a three-necked flask, stir and react in an ice-water bath for 4 h;
[0063] The third step is to prepare the finished product
[0064] Take by weighing 44.79 g HTPB, the n-butyric acid modified epoxy resin E-44 that 2.04 ...
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