A kind of preparation method of polymethacrylimide foam material
A technology of polymethacrylimide and foam materials, which is applied in the field of preparation of polymethacrylimide foam materials, and can solve the problem of uneven foamable copolymer sheets, uneven foam sheets, and low production efficiency, etc. problems, to achieve the effect of low cost, broad application prospects, and increased interface area
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Embodiment 1
[0039] (1) Mix 150 g acrylonitrile, 46 g methacrylic acid, 23 g N,N-dimethylacrylamide, 11.5 g butyl acrylate, 0.9 g ethylene glycol dimethacrylate, 1.27 g azobisiso Butyronitrile, 80 g n-pentane were stirred for 5 min to obtain a homogeneous oil phase;
[0040] (2) 1500 g deionized water, 70 g nano-silica, 450 g sodium chloride, 1 g polyvinylpyrrolidone, 0.6 g ethanol, 0.3 g sodium nitrite were homogeneously emulsified at 10000 rpm for 3 min, Adjust the pH value to 3 as the aqueous phase of the polymerization reaction;
[0041] (3) Slowly add the prepared oil phase into the water phase dropwise, and mechanically stir for 30 minutes to mix well to form an oil-in-water emulsion;
[0042] (4) The prepared emulsion was injected into the reactor, replaced by nitrogen for 3 times, the reactor was sealed, the initial pressure was controlled at 0.5 MPa, polymerized at 60 °C for 25 h, filtered, washed and dried to obtain thermally expandable microspheres.
[0043] (5) Add the prepar...
Embodiment 2
[0053] The difference between Example 2 and Example 1 is that, on the basis of Example 1, the oil phase is replaced with 150 g of acrylonitrile, 46 g of methacrylic acid, and 23 g of N,N-dimethylacrylamide in step 2 , 11.5 g methyl acrylate, 0.9 g ethylene glycol dimethacrylate, 1.27 g azobisisobutyronitrile, 80 g isohexane to prepare thermally expandable microspheres;
[0054] Step 5 is: Add the prepared thermally expandable microspheres into a pressing mold preheated to 50°C, use a plastic hydraulic press to foam, the mold pressure is 0.5~1 MPa, and adopt a stepwise heating method to foam: at 1°C / min The heating rate was raised to 140°C and kept for 20 minutes, and the temperature was raised to 205°C at a heating rate of 1.5°C / min. According to the different shapes of the components, the pressure was kept for 10-30 minutes. Methacrylimide foam.
[0055] The average diameter of the microspheres prepared in this example is 52.6 μm.
[0056] Static thermomechanical analysis r...
Embodiment 3
[0058] The difference between Example 3 and Example 1 is that, on the basis of Example 1, the oil phase is replaced with 150 g of acrylonitrile, 46 g of methacrylic acid, and 23 g of N,N-dimethylacrylamide in step 2 , 11.5 g ethyl acrylate, 0.9 g ethylene glycol dimethacrylate, 1.27 g azobisisobutyronitrile, 80 g isoheptane, made thermally expandable microspheres;
[0059] Step 5 is: Add the prepared thermally expandable microspheres into a pressing mold preheated to 50°C, use a plastic hydraulic press to foam, the mold pressure is 0.5~1 MPa, and adopt a stepwise heating method to foam: at 1°C / min The heating rate is raised to 140°C and kept for 20 minutes, and the temperature is raised to 210°C at a heating rate of 1°C / min. According to the different shapes of the components, the pressure is kept for 10-30 minutes. base acrylimide foam.
[0060] The average diameter of the microspheres prepared in this example is 52.4 μm.
[0061] Static thermomechanical analysis results sh...
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