A kind of method of ethylene polymerization and polyethylene
A technology of ethylene polymerization and polymerization reaction, which is applied in the field of polyethylene, can solve the problems of poor thermal stability and hydrothermal stability, low ethylene polymerization activity, and influence on catalytic activity, and achieve stable mesopore structure, improved fluidity, and difficult strength broken effect
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[0028] In a preferred case, the preparation method of the catalyst may include: contacting the spherical mesoporous composite material with a mother liquor containing magnesium salt and / or titanium salt in the presence of an inert gas.
[0029] Preferably, the contacting conditions include: a temperature of 25-100° C., preferably 40-60° C.; a time of 0.1-5 h, preferably 1-3 h.
[0030] The mother liquor that contains magnesium salt and / or titanium salt can be the organic solvent that contains magnesium salt and / or titanium salt, and described organic solvent can be Virahol and tetrahydrofuran, and the volume ratio of tetrahydrofuran and Virahol can be 1: 1-3, preferably 1:1-1.5.
[0031]During the preparation of the catalyst, the magnesium salt and / or the titanium salt are preferably used in excess relative to the spherical mesoporous composite material. More preferably, the amount of the magnesium salt, the titanium salt and the spherical mesoporous composite material is suc...
Embodiment approach
[0051] The present invention has no special limitation on the conditions of the first mixing contact, for example, the conditions of the first mixing contact generally include: the temperature can be 10-60°C, preferably 10-20°C; the time can be 10-72 Hours, preferably 10-30 hours; pH value can be 1-7, preferably 3-6. In order to be more conducive to uniform mixing among the various substances, according to a preferred embodiment of the present invention, the first mixing and contacting is performed under stirring conditions.
[0052] In the present invention, the crystallization conditions include: the temperature may be 30-150° C., preferably 40-80° C.; the time may be 10-72 hours, preferably 20-30 hours. According to a preferred embodiment, the crystallization is carried out by hydrothermal crystallization.
[0053] In step (1), in the process of preparing the filter cake of the mesoporous molecular sieve material with a one-dimensional hollow spherical pore structure, the ...
Embodiment 1
[0088] This embodiment is used to illustrate the ethylene polymerization method of the present invention and the obtained polyethylene
[0089] (1) Preparation of spherical mesoporous composites
[0090] Add 1g (0.00017mol) of template agent P123 and 1.69g (0.037mol) of ethanol into 28mL of acetic acid and sodium acetate buffer solution with pH = 4.4, stir at 15°C until the template agent is completely dissolved, and add 6g (0.05mol) of three Add methylpentane to the above solution, stir at 15°C for 8h, then add 2.13g (0.014mol) tetramethoxysilane to the above solution, stir at 15°C for 20h, then transfer the solution to the agate lining After crystallizing in an oven at 60°C for 24 hours in a reaction kettle, filter and wash with deionized water for 4 times, and then filter with suction to obtain filter cake A1 of mesoporous molecular sieve material with a one-dimensional hollow spherical pore structure.
[0091] The water glass with a concentration of 15% by weight and the ...
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