A kind of preparation method of hollow porous material
A porous material, hollow technology, applied in the field of preparation of hollow porous materials, can solve a large number of organic solvents, human and environmental hazards, complex polymer synthesis equipment and other problems
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[0026] The invention discloses a method for preparing a hollow porous material, which comprises the following steps:
[0027] Heating and melting the resin-based material, cooling, and annealing at 30-150°C, the resin-based material is a radiation crosslinking polymer material or a radiation cracking polymer material system;
[0028] Using cobalt 60 or an electron accelerator to irradiate the annealed resin-based material;
[0029] performing gel extraction on the irradiated resin-based material with an organic solvent to obtain a resin gel;
[0030] The resin gel is washed, dried and annealed to obtain a hollow porous material.
[0031] In the present invention, the resin-based material is a radiation crosslinking polymer material or a radiation cracking polymer material system, wherein the radiation crosslinking polymer material is preferably polyethylene, polypropylene, ethylene-octene copolymer or hydrogenated styrene-butadiene-styrene block copolymer; the radiation crac...
Embodiment 1
[0040] Pour the high-density polyethylene particles into the torque rheometer, melt at 140°C, then take out the melted material, quickly place it in liquid nitrogen to cool, and anneal in an oven at 50°C for 30 minutes;
[0041] Place the annealed high-density polyethylene in a cobalt-60 source to irradiate to make it cross-linked, and the absorbed dose is 50kGy;
[0042] Perform gel extraction on the irradiated high-density polyethylene with xylene for 30 hours to obtain a resin gel;
[0043] The resin gel was repeatedly washed with ethanol, dried, and finally annealed at 100° C. for 2 hours to obtain a hollow porous high-density polyethylene material. The material density and average pore size were measured by scanning electron microscopy, and the specific data are shown in Table 1.
Embodiment 2
[0045] The mixture of ethylene-vinyl alcohol copolymer and triallyl isocyanurate with an ethylene segment content of 44% and a mass ratio of 100:5 was melt-blended in a torque rheometer at 190°C. Then take out the molten material, quickly place it in liquid nitrogen to cool, and anneal in an oven at 130°C for 30 minutes;
[0046] Use an electron accelerator to irradiate the annealed material to make it cross-linked, and the absorbed dose is 100kGy;
[0047] Perform gel extraction on the irradiated material with hexafluoroisopropanol for no less than 30 hours to obtain a resin gel;
[0048] The resin gel was repeatedly washed with ethanol, dried, and finally annealed at 110° C. for 2 hours to obtain a hollow porous ethylene-vinyl alcohol copolymer material. The material density and average pore size were measured by scanning electron microscopy, and the specific data are shown in Table 1.
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