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A kind of copolymerization method of ethylene and terminal alkenyl silane/siloxane

A technology of terminal alkenyl silane and siloxane, applied in the field of copolymerization of ethylene and terminal alkenyl silane/siloxane, which can solve the problems of low polymerization activity, low polymer molecular weight and branching degree, and high price

Active Publication Date: 2020-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, patent document WO 03 / 044066 A2 discloses that late transition metal complexes of bidentate or tridentate ligands can be used to copolymerize ethylene with allyl- or vinyl-silane, however, this method requires expensive modifications. Methylaluminoxane (MMAO) is used as a cocatalyst, and it is polymerized at a relatively high ethylene polymerization pressure of 4.0-6.0 MPa, and the molecular weight and branching degree of the obtained polymer are relatively low
Dalton Transaction, 2015, 44(47): 20745-20752 uses pyridinediimide iron-based catalysts to catalyze the copolymerization of propylene and silicon-containing polar monomers. This method still needs to use MMAO as a co-catalyst and requires a temperature of 30°C or even lower Polymerization reaction at 0°C for 16 hours, and the polymerization activity is low

Method used

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  • A kind of copolymerization method of ethylene and terminal alkenyl silane/siloxane
  • A kind of copolymerization method of ethylene and terminal alkenyl silane/siloxane
  • A kind of copolymerization method of ethylene and terminal alkenyl silane/siloxane

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Experimental program
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Effect test

Embodiment approach

[0026] According to a preferred embodiment of the present invention, the main catalyst is selected from at least one of the following complexes,

[0027] Complex 1: R 1 = R 3 = R 4 = R 6 = Me,R 2 = R 5 = H, X = Br;

[0028] Complex 2: R 1 = R 3 = R 4 = R 6 =Et,R 2 = R 5 = H, X = Br;

[0029] Complex 3: R 1 = R 3 = R 4 = R 6 =iPr, R 2 = R 5 = H, X = Br;

[0030] Complex 4: R 1 = R 2 = R 3 = R 4 = R 5 = R 6 =Me, X=Br;

[0031] Complex 5: R 1 = R 3 = R 4 = R 6 = Me,R 2 = R 5 =Br, X=Br;

[0032] Complex 6: R 1 = R 3 = R 4 = R 6 = Me,R 2 = R 5 = Et, X = Br;

[0033] Complex 7: R 1 = R 3 = R 4 = R 6 =Et,R 2 = R 5 =Me, X=Br;

[0034] Complex 8: R 1 = R 3 = R 4 = R 6 =Et,R 2 = R 5 =Br, X=Br;

[0035] Complex 9: R 1 = R 3 = R 4 = R 6 = F, R 2 = R 5 = H, X = Br;

[0036] Complex 10: R 1 = R 3 = R 4 = R 6 = Cl, R 2 = R 5 = H, X = Br;

[0037] Complex 11: R 1 = R 3 = R 4 = R 6 =Br,R 2 = R 5 = H, X = Br;

[0038] Compl...

Embodiment 1

[0085] The 1L stainless steel polymerization kettle equipped with mechanical stirring was continuously dried at 130°C for 6hrs, vacuumized while hot and heated with N 2 Gas replacement 3 times; add 6.5 mg (10 μmol) of complex 2, then evacuate and replace 3 times with ethylene, inject 500 mL of toluene, add 6.5 mL of methylaluminoxane (MAO) (1.53 mol / L toluene solution) , make Al / Ni=1000, 5mL of allyltrimethoxysilane (28.7mmol), at 60°C, keep ethylene pressure of 10atm, and stir for 30min. Finally, it was neutralized with an ethanol solution acidified with 5 volume % hydrochloric acid to obtain a polymer. The polymerization activity and performance parameters of the polymer are shown in Table 1.

Embodiment 2

[0087] The 1L stainless steel polymerization kettle equipped with mechanical stirring was continuously dried at 130°C for 6hrs, vacuumized while hot and heated with N 2 Gas replacement 3 times; add 6.5 mg (10 μmol) of complex 2, then vacuumize and replace with ethylene for 3 times, inject 500 mL of toluene, and then add 6.5 mL of methylaluminoxane (MAO) (1.53 mol / L toluene solution) , make Al / Ni=1000, 8mL of allyltrimethoxysilane (45.9mmol), at 60°C, keep 10atm of ethylene pressure, and stir for 30min. Finally, it was neutralized with an ethanol solution acidified with 5 volume % hydrochloric acid to obtain a polymer. The polymerization activity and performance parameters of the polymer are shown in Table 1.

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Abstract

The invention belongs to the field of olefin copolymerization reactions, and provides a copolymerization method of ethylene and alkenyl-terminated silane / siloxane. The copolymerization method comprises that ethylene and alkenyl-terminated silane / siloxane are subjected to a copolymerization reaction in the presence of a catalyst composition, wherein the catalyst composition contains a main catalyst, a co-catalyst and an optional chain transfer agent, the main catalyst is at least one selected from coordination compounds represented by a formula (I), R<1>-R<10> are respectively and independentlyselected from hydrogen, saturated or unsaturated hydrocarbonyl, hydrocarbyloxy and the like, M is selected from a Group VIII metal, and X is a halogen. According to the present invention, the used catalyst composition has high polymerization activity in the ethylene and alkenyl-terminated silane / siloxane copolymerization reaction, can increase the content of the copolymerization monomer on the polymer molecular chain, and has broad industrial application prospects. The formula (I) is defined in the specification.

Description

technical field [0001] The invention belongs to the field of olefin copolymerization reaction, and in particular relates to a method for copolymerization of ethylene and terminal alkenyl silane / siloxane. Background technique [0002] Olefin copolymers containing vinylsilane or siloxane derivative groups can be used in many fields, such as various types of cable materials, pipes, adhesives, gaskets and cross-linked foams. Vinyl silane groups can be linked to olefin polymers by two methods: one method is to form olefins and vinyl silane compounds through high temperature and high pressure copolymerization under the catalysis of free radical initiators (such as US 3225018), This polymerization process is similar to ethylene high-pressure homopolymerization, and the resulting copolymer structure is similar to that of low-density polyethylene; another method is to graft an allyl- or vinyl-silane to an existing polystyrene. On olefin (as US 3646155), the advantage of grafting is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F230/08C08F4/70
CPCC08F210/02C08F230/08C08F4/7006
Inventor 高榕李岩周俊领刘东兵赖菁菁黄廷杰
Owner CHINA PETROLEUM & CHEM CORP
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