Ethylene-based polymer, method for producing ethylene-based polymer, method for producing polymerization catalyst, hollow plastic molded article containing ethylene-based polymer, and use thereof
A technology for catalysts and polymers, applied in the fields of manufacturing catalysts for polymerization, hollow plastic moldings, and hollow plastic products, can solve the problems of undisclosed embodiments, undisclosed catalyst manufacturing methods, etc., and achieve the effect of excellent formability
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Embodiment 1-1
[0272] (1) Preparation of chromium catalyst precursor
[0273] Silica gel was prepared according to US Patent 5,232,883. The specific surface area of the silica gel is 800m 2 / g, the pore volume is 2.0cm 3 / g, and the average particle size is 100 μm. In addition, according to the method of "Example I. Catalyst Preparation Procedure" in U.S. Patent 4,119,773, a methylene chloride solution containing chromium(III) acetate and aluminum sec-alkoxide was reacted with the above silica gel to make Cr and The contents of Al were changed to 1% by weight and 2% by weight, respectively, so that bluish-white chromium catalyst precursor particles having good fluidity were obtained.
[0274] (2) Roasting activation of chromium catalyst
[0275] The chromium catalyst precursor particles (5kg) obtained in the above-mentioned item (1) are packed into a quartz glass tube with a diameter of 5 cm with a perforated plate grid, installed in a cylindrical electric furnace for roasting, and pas...
Embodiment 1-2
[0306] Isobutane and the chromium catalyst obtained in Example 1-1(2) were continuously supplied at a rate of 120 L / h and 5 g / h, respectively, to a loop reactor having a volume of 200 L. While discharging the contents of the reactor at a desired rate, ethylene and 1-hexene were supplied to maintain the mass ratio of 1-hexene concentration to ethylene concentration in the liquid phase at 98°C at 0.13, at full In a liquid state, polymerization was continuously performed under the conditions of a total pressure of 4.0 MPa and an average residence time of 1.5 hours. The productivity of the catalyst was 3,000 g-polymer / g-catalyst, and the average polymerization activity was 2,000 g-polymer / g-catalyst / h. The formability of fuel tanks for automobiles was evaluated. The results obtained are shown in Table 1 below.
Embodiment 2-1
[0322] (1) Preparation of chromium catalyst precursor
[0323] Carrier A (silica gel, specific surface area: 850m 2 / g, pore volume: 2.2cm 3 / g, average particle size: 100 μm) (50 g) and 200 ml of ion-exchanged water were put into a 1 L flask with a stirrer, and heated in an oil bath at 50° C. under stirring at a speed of 50 rpm. An aqueous solution prepared separately by dissolving 2.2 g of chromium(III) acetate (manufactured by Wako Pure Chemical Industries) in 70 mL of ion-exchanged water was added to the above reaction mixture in its entirety, the rotation speed was increased to 150 rpm, and stirring was continued for 4 hours, thereby making the obtained The silica gel is fully impregnated with the chromium compound. Subsequently, the temperature of the oil bath was raised to 155° C., water was completely distilled off, and the reaction product was further dried overnight at 120° C., thereby obtaining bluish-white chromium catalyst precursor particles with good fluidity ...
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