Polymethacrylimide foamable particle rapidly prepared by photo-initiation
A polymethacrylimide and foamed particle technology, which is applied in the field of material preparation, can solve the problems of discontinuous reaction process, long reaction period, low particle yield, etc., so as to shorten the reaction time, improve the compressive strength and Tensile strength, the effect of improving reaction efficiency
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Embodiment 1
[0036] A kind of polymethacrylimide expandable particle that photoinitiates rapid preparation is prepared according to the following scheme:
[0037] Step (1) pre-polymerization: with the acrylonitrile of 40 parts by weight, the methacrylic acid of 50 parts by weight, the third monomer of 10 parts by weight, the initiator of 1.5 parts by weight, the foaming agent of 3.5 parts by weight, 1.5 parts by weight Mix the cross-linking agent in the reaction kettle evenly and dissolve to obtain a uniform solution. Under the protection of nitrogen, raise the temperature to 50°C, stir and react at 350r / min for 3h, and cool down to 20°C to obtain a reaction solution with a certain viscosity;
[0038] Step (2) Photocuring: Add 0.05 parts by weight of terbium-doped anti-yellowing photoinitiator, 0.5 parts by weight of high-temperature stage initiator and 5 parts by weight of nucleating agent to the obtained reaction solution with a certain viscosity. Dissolve and disperse evenly, then pour ...
Embodiment 2
[0055] A kind of polymethacrylimide expandable particle that photoinitiates rapid preparation is prepared according to the following scheme:
[0056] Step (1) prepolymerization: with the methacrylonitrile of 10 weight parts, the acrylic acid of 80 weight parts, the 3rd monomer of 1 weight part, the initiator of 0.05 weight part, the blowing agent of 2.5 weight parts, 0.1 weight part Mix the cross-linking agent in the reaction kettle evenly, dissolve to obtain a uniform solution, under the protection of nitrogen, raise the temperature to 40°C, stir and react at 200r / min for 1h, and cool down to 20°C to obtain a reaction solution with a certain viscosity;
[0057] Step (2) Photocuring: Add 0.05 parts by weight of terbium-doped anti-yellowing photoinitiator, 0.5 parts by weight of high-temperature stage initiator and 5 parts by weight of nucleating agent to the obtained reaction solution with a certain viscosity. Dissolve and disperse evenly, then pour the reaction solution into ...
Embodiment 3
[0074] A kind of polymethacrylimide expandable particle that photoinitiates rapid preparation is prepared according to the following scheme:
[0075] Step (1) pre-polymerization: with the methacrylonitrile of 90 parts by weight, the methacrylic acid of 20 parts by weight, the third monomer of 30 parts by weight, the initiator of 2.5 parts by weight, the blowing agent of 4 parts by weight, 3 parts by weight The cross-linking agent in parts by weight is mixed evenly in the reactor, and dissolved to obtain a uniform solution. Under the protection of nitrogen, the temperature is raised to 60°C, stirred and reacted at 500r / min for 5h, and the temperature is lowered to 20°C to obtain a reaction solution with a certain viscosity;
[0076] Step (2) Photocuring: Add 0.15 parts by weight of terbium-doped anti-yellowing photoinitiator, 3 parts by weight of high-temperature initiator and 10 parts by weight of nucleating agent to the obtained reaction solution with a certain viscosity, Dis...
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