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Polyisoprene rubber and preparation method thereof

A technology of polyisoprene and isoprene, which is applied in the field of cobalt post-transition metal complex catalyst systems, can solve the problems of heat generation, low rolling resistance, and poor mechanical properties, and achieve high catalytic activity and experimental operation The effect of not being harsh

Inactive Publication Date: 2013-09-11
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat generation and rolling resistance of 3,4-polyisoprene are lower than that of styrene-butadiene rubber, and its wet skid resistance is better than that of styrene-butadiene rubber, but its mechanical properties are poor, so it cannot be used alone in tires, and can only be used in combination
However, at present, there are few studies and patents on isoprene polymerization using late-transition metals, especially cobalt-catalyzed systems, and only Ricci has reported the use of CoCl 2 (PRPh 2 ) 2 -MAO synthesized cis-1,4 and 3,4 alternately copolymerized polyisoprene rubber [Macromolecules 2009,42: 9263-9267]

Method used

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  • Polyisoprene rubber and preparation method thereof
  • Polyisoprene rubber and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 0.08 g of cobalt chloride complex catalyst (C1: R=Me, R 1 =Me,R 2 =H), 800 mL isoprene monomer, 870 mL solvent toluene and 13.7 mL ethylaluminum sesquichloride (EASC), the polymerization temperature was 30 °C, and the polymerization time was 0.5 h. Terminate the reaction with 200 mL of 0.1wt% acidified ethanol, wash 3 times to remove solvent and unreacted monomer, and vacuum dry to obtain 102 grams of polyisoprene rubber material, in which cis-1,4-polyisoprene accounts for 95.3mol%, 3,4-polyisoprene accounts for 4.7mol%. The monomer conversion rate is 18.8%, and the catalytic activity is 3.50 × 10 6 g PI (mol Co) -1 h -1 .

Embodiment 2

[0025] Add 0.90 mg of cobalt bromide complex catalyst (C2: R=Me, R 1 =Me,R 2 =Me), 1500 mL isoprene monomer and 85.5 mg triethylaluminum, the polymerization temperature was 10 °C, and the polymerization time was 24 h. Terminate the reaction with 200 mL of 0.1 wt% acidified ethanol, wash 3 times to remove solvent and unreacted monomer, and vacuum dry to obtain 3 g polyisoprene rubber material, in which cis-1,4-polyisoprene accounts for 91.3mol%, 3,4-polyisoprene accounts for 8.7mol%. The monomer conversion rate is 0.29%, and the catalytic activity is 8.3 × 10 6 g PI (mol Co) -1 h -1 .

Embodiment 3

[0027] 72.4 mg of cobalt iodide complex catalyst (C3: R=Me, R 1 =Et,R 2=Me), 100 mL isoprene monomer, 1000 mL solvent xylene and 396 mg triisobutylaluminum, the polymerization temperature was 90 °C, and the polymerization time was 10 min. Terminate the reaction with 200 mL of 0.1 wt% acidified ethanol, wash 3 times to remove solvent and unreacted monomer, and finally vacuum dry to obtain 0.5 g polyisoprene rubber material, in which cis-1,4-polyisoprene It accounts for 94.2 mol%, and 3,4-polyisoprene accounts for 5.8 mol%. The monomer conversion rate is 0.74%, and the catalytic activity is 3.0 × 10 4 g PI (mol Co) -1 h -1 .

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Abstract

The invention discloses 4mol%-70mol% polyisoprene rubber with a 3,4-structure and a preparation method thereof as well as a cobalt complex catalyst adopted. The regulation on a 3,4-structure of the polyisoprene can be realized by replacing expensive alkoxy aluminum MAO (Monoi Amine Oxidottom) with a proper aluminum alkyl cocatalyst. The polyisoprene rubber can be used for preparing tires with wet skid resistance and low generated heat and other rubber products.

Description

technical field [0001] The invention belongs to the field of rubber materials, and more specifically relates to a polyisoprene with a 3,4-structure of 4mol% to 70mol%, a preparation method thereof, and a cobalt late-transition metal complex catalyst system. Background technique [0002] For polyisoprene synthetic rubber materials, the increase of 3,4-structure content makes the resilience of polyisoprene rubber decrease, the grip performance is improved, water resistance, oil resistance and electrical properties are improved, and water permeability, oil resistance and electrical properties are improved. Air permeability is close to butyl rubber. The use of polyisoprene with a 3,4-structure content of 50% to 90% for the manufacture of high-performance tires has been reported in foreign literature, and 3,4-polyisoprene rubber is used for tread rubber. It can not only improve its anti-wet skid performance, but also keep the tire with good low rolling resistance and wear resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F136/08C08F4/70
Inventor 贺爱华姜秀波孙文华邵华锋刘晨光王日国
Owner QINGDAO UNIV OF SCI & TECH