Catalyst component for vinyl polymerization and catalyst comprising the same

[0041] Example 1

[0042] (1) Preparation of catalyst components: In a reactor fully replaced by high-purity nitrogen, add 4.0g magnesium dichloride (0.042mol), 60ml toluene, 19.2g (0.084mol) tetraethoxytitanium, 6.9ml in sequence (0.1176mol) ethanol, 2.1ml (0.0126mol) triethoxyborane, heated to 70°C with stirring, and reacted at 70°C when the solid was completely dissolved to form a uniform solution. The temperature was lowered to 65°C, 21ml of 2M monochlorodiethylaluminum heptane solution was slowly added dropwise, and the reaction was maintained at 65°C for 1 hour, then the temperature was raised to 90°C and the reaction continued for 1 hour. The system was cooled to 30°C, the solid was allowed to settle, the filtrate was filtered, and the solid was washed twice with 60ml of hexane, 60ml of hexane was added to the solid and stirred, 60ml of titanium tetrachloride was slowly added dropwise and reacted at 30°C for 1 hour. Stop stirring and let it stand. The suspension is separated quickly, the supernatant is removed, washed with hexane four times, and dried with high-purity nitrogen to obtain a solid catalyst component with good fluidity and narrow particle size distribution. The catalyst composition is shown in Table 1.

[0043] (2) Ethylene polymerization

[0044] A stainless steel reactor with a volume of 2L, after being fully replaced by high-purity nitrogen, add 1L of hexane, 1.0ml of triethylaluminum with a concentration of 1M, add the solid catalyst prepared above, heat up to 70°C, and pass hydrogen to make the pressure inside the kettle When it reaches 0.50Mpa, ethylene is then introduced to make the total pressure in the kettle reach 1.0Mpa (gauge pressure), and the polymerization is carried out at 90°C for 2 hours. The polymerization results are shown in Table 1.

[0045] Example 2

[0046] (1) The synthesis of the catalyst is the same as in Example 1. Only the amount of ethanol was changed from 6.9ml to 4.9ml.

[0047] (2) Ethylene polymerization is the same as in Example 1. The catalyst composition and polymerization results are shown in Table 1.

[0048] Example 3

[0049] (1) The synthesis of the catalyst is the same as in Example 2. Only diethyl aluminum chloride is changed to isobutyl aluminum dichloride.

[0050] (2) Ethylene polymerization is the same as in Example 1. The catalyst composition and polymerization results are shown in Table 1.