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A kind of preparation method of ethylene block copolymer

An ethylene block and copolymer technology, which is applied in the field of preparation of ethylene block copolymers, can solve the problems of low shuttling efficiency and wide product molecular weight distribution, and achieve the effects of shortened residence time, improved chain shuttling efficiency, and high production efficiency

Inactive Publication Date: 2015-10-28
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the slurry polymerization, since the polymerization temperature is lower than the melting temperature of the polyethylene product, the polyethylene segment grows and crystallizes to form semi-crystalline polyethylene particles. In a heterogeneous medium, the chain shuttling agent is limited. Shuttling efficiency between the two catalysts, resulting in low shuttling efficiency and broad product molecular weight distribution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] A method for preparing ethylene block copolymers. Firstly, the supergravity reactor is purged with high-purity nitrogen at 105° C. for 10 hours to replace the air and water in the reaction equipment. Send the mixture of catalyst, cocatalyst, chain shuttling agent, comonomer and diluent into the high gravity reactor with a metering pump, after heating the reactor to the required temperature, feed ethylene gas, and start the high gravity reactor device . The reactor and the high-gravity rotating device disclosed in the aforementioned application numbers 91109255.2, 91111028.3, and CN200410042631.6 are contacted in the packing layer, baffle channel, rotating channel, and disk of the high-gravity reactor to complete the slurry method or solution method. Polymerization. The reacted product is put into a product tank, a terminator is added, and then the product is post-treated according to commonly used thinner removal, washing, drying, etc. to obtain an ethylene block polym...

Embodiment 1

[0026] The high gravity reactor used in this example is a rotating packed bed reactor.

[0027] The reaction device was purged with high-purity nitrogen to remove air and water in the reaction device. 1000ml toluene, 3ml concentration is 7.5×10 -4 The toluene solution of the first catalyst bisphenoxyamine Zr catalyst of mol / l, 3ml concentration is 7.5 * 10 -4 After mixing the toluene solution of the second catalyst pyridinamine Hf catalyst in mol / l, 5mmol trimethylaluminoxane (MAO) and 2mmol diethylzinc, the temperature was raised to 150°C and sent into the supergravity reactor, adding 0.5ml of 1-hexene, adjust the temperature of the reactor to 150°C, then cut into ethylene, the reaction pressure is normal pressure, and start the polymerization reaction. The reaction temperature is higher than the melting temperature of polyethylene, so the polymerization process is solution polymerization. Adjust the rotor speed of the supergravity rotating bed reactor so that the supergra...

Embodiment 2

[0029] Except that the supergravity level is 5g, the others are the same as in Example 1, the weight average molecular weight of the product is 15,121, and the molecular weight distribution is 1.86.

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PUM

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Abstract

The invention relates to a preparation method of an ethylene segmented copolymer; the preparation method is characterized by comprising the following steps of: using ethylene or ethylene as a monomer, feeding a mixed solution of a catalyst, a thinner, a catalyst promoter, a chain travel agent and a copolymer monomer in a super-gravity reactor by using a metering pump, heating the super-gravity reactor to a required temperature, feeding the monomer, carrying out slurry polymerization or solution polymerization under the super-gravity condition, controlling the polymerization temperature between 40 DEG C and 300 DEG C and controlling the super-gravity level of the super-gravity reactor in the reaction process at 5-800g, wherein g is acceleration of gravity and the polymerization time is 1minutes to 6hours; and after the reaction, performing the post treatment of removing the thinner, washing and drying, so as to obtain the polymer. With the adoption of the preparation method, the super-gravity reactor is used, the reaction system is performed in a super-gravity field, the mass transfer process and the heat transfer process are strengthened; compared with the stirring polymerization in the prior art, the average retaining time of the material in the super-gravity reactor is shortened at least by more than 20 times, the energy consumption is low and the production efficiency is high; and meanwhile, for solution polymerization and slurry polymerization, the chain travel efficiency is greatly improved and the molecular weight distribution of the production is narrower.

Description

technical field [0001] The invention relates to the extended application of high gravity technology in polymerization reaction engineering, in particular to a preparation method of ethylene block copolymer. Background technique [0002] Conventional polyethylene products only have a statistical copolymer structure, which makes some properties of polyethylene deficient. Although increasing the content of comonomer can increase the content of intergranular tie molecules and improve the long-term mechanical properties of the material, the rigidity and service temperature of the material are greatly reduced. The Tg of a block copolymer is determined by the polymer with a lower Tg, while the softening point is dependent on the polymer with a higher Tg. The high elastic state of block copolymers has a wide temperature range, which can make up for the shortcomings of traditional ethylene copolymer products. Living polymerization (living polymerization) is a polymerization process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/16C08F210/06C08F2/01C08F2/38C08F2/06
Inventor 陈忠仁历伟侯琳熙穆景山
Owner NINGBO UNIV