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Copolymerization method of ethylene and alkenyl-terminated silane/siloxane

A technology of terminal alkenyl silane and siloxane, which is applied in the field of copolymerization of ethylene and terminal alkenyl silane/siloxane, can solve the problems of low polymerization activity, inability to carry out copolymerization reaction, low polymer molecular weight and low degree of branching, etc. , to achieve the effect of high polymerization activity and broad industrial application prospects

Active Publication Date: 2018-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, patent document WO 03 / 044066A2 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 the use of expensive modified 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, and the copolymerization reaction cannot be carried out when the temperature is high

Method used

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  • Copolymerization method of ethylene and alkenyl-terminated silane/siloxane
  • Copolymerization method of ethylene and alkenyl-terminated silane/siloxane
  • Copolymerization method of ethylene and alkenyl-terminated silane/siloxane

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Experimental program
Comparison scheme
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] Comp...

Embodiment 1

[0099] 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 Air replacement 3 times. Add 9.8 mg (10 μmol) of complex 3, then vacuumize and replace with ethylene three times; inject 500 mL of toluene, and then add 6.5 mL of methylaluminoxane (MAO) (1.53 mol / L toluene solution) to make Al / Ni=1000, 5mL of allyltrimethoxysilane (28.7mmol), at 70°C, maintain 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

[0101] 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 9.8 mg (10 μmol) of complex 3, then vacuumize and replace with ethylene 3 times; inject 500 mL of toluene, then add 6.5 mL of methylaluminoxane (MAO) (1.53 mol / L toluene solution ), make Al / Ni=1000, 5mL allyltrimethoxysilane (28.7mmol), at 100°C, keep 10atm 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 contents of the copolymerization monomer and themethyl 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 Applications(China)
IPC IPC(8): C08F210/02C08F4/70
CPCC08F210/02C08F4/7006
Inventor 高榕周俊领李岩刘东兵赖菁菁傅捷
Owner CHINA PETROLEUM & CHEM CORP
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