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Styrene/isoprene/butadiene tri-component random copolymer of rare-earth catalysis system and preparation method thereof

A random copolymer, rare earth catalyzed technology, applied in the field of polymer materials, can solve the problems of wide molecular weight distribution, large difference in polysegregation rate, and difficulty in obtaining effective methods for styrene/butadiene random copolymers. To achieve the effect of narrow molecular weight distribution

Active Publication Date: 2010-12-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of rubber material called silicone polymers was developed during World War II for use in making materials that were resistant against chemicals such as ozone gasoline. These types of rubbers have unique properties like being elastic at room temperature but hard when heated up again after having been compressed. They also allow gases to pass through without losing their effectiveness due to impermeability.

Problems solved by technology

This patented technical problem addressed in this patent relates to finding ways to make improved durability and reduced vapor pressure properties in vulcanized rubber products without compromising their mechanical strength and flexibility at room temperatures. Previous methods involve adding certain chemical substances like sulfite ester compounds containing unsatriphilic groups along with organopolysulfuranes called strylon blocks. These chemically modified materials help reduce stickiness between rubbing surfaces while maintaining sufficient hardness and tensile rigidity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] At room temperature, add 1.5ml Nd(O i Pr) 3 (0.102 mmol / ml), 0.30 ml indene (0.5 mmol / ml, dissolved in cyclohexane), 0.46 ml isoprene, and 13.91 ml MAO (10 wt%, dissolved in toluene). Shake to make it evenly mixed, and react at 50°C for 2h.

[0025] Using cyclohexane as a solvent, the monomer concentration is 35g / ml, add 1.49g of butadiene, 1.87g of isoprene, and 2.80g of styrene to a 60ml polymerization reactor according to the ratio; take 5.27ml of the aged catalyst (Nd / diene molar ratio is 1.0×10 -3 ) into the polymerization bottle. Shake to make it evenly mixed, and react at 70°C for 4h. The reaction was terminated with an ethanol solution containing 1% 2,6-di-tert-butyl-p-methylphenol, and the polymer was precipitated in excess ethanol, washed and extruded with ethanol, and then dried under reduced pressure at 40°C for 24 hours.

[0026] Product structure analysis result is as follows: the content of styrene is 16.2wt%, polybutadiene content is 39.4wt%, polyis...

Embodiment 2

[0028] At room temperature, add 0.1012g Nd(P 507 ) 3 , 0.22 ml indene (0.5 mmol / ml, dissolved in cyclohexane), 0.34 ml isoprene, and 15.37 ml MAO (10 wt%, dissolved in toluene). Shake to make it evenly mixed, and react at 50°C for 2h.

[0029] Using cyclohexane as a solvent, the monomer concentration is 40g / ml, add 2.02g of butadiene, 2.60g of isoprene, and 3.83g of styrene to a 60ml polymerization reactor according to the ratio; take 10.70ml of the aged catalyst (Nd / diene molar ratio is 1.0×10 -3 ) into the polymerization bottle. Shake to make it evenly mixed, and react at 70°C for 4h. The reaction was terminated with an ethanol solution containing 1% 2,6-di-tert-butyl-p-methylphenol, and the polymer was precipitated in excess ethanol, washed and extruded with ethanol, and then dried under reduced pressure at 40°C for 24 hours.

[0030] Product structure analysis result is as follows: the content of styrene is 16.9wt%, polybutadiene content is 54.0wt%, polyisoprene conte...

Embodiment 3

[0032] At room temperature, add 1.20ml Nd(O i Pr) 3 (0.102mmol / ml), 0.37ml indene (0.5mmol / ml, dissolved in cyclohexane), 0.37ml isoprene, and 7.79ml MAO (10 wt%, dissolved in toluene). Shake to make it evenly mixed, and react at 50°C for 2h.

[0033] Using cyclohexane as a solvent, the monomer concentration is 35g / ml, add 2.4g of butadiene, 3.0g of isoprene, and 9.9g of styrene into a 60ml polymerization reactor according to the ratio; take 8.5ml of aged Catalyst (Nd / diolefin molar ratio is 1.2×10 -3 ) into the polymerization bottle. Shake to make it evenly mixed, and react at 70°C for 4h. The reaction was terminated with an ethanol solution containing 1% 2,6-di-tert-butyl-p-methylphenol, and the polymer was precipitated in excess ethanol, washed and extruded with ethanol, and then dried under reduced pressure at 40°C for 24 hours.

[0034] Product structure analysis result is as follows: the content of styrene is 15.3wt%, polybutadiene content is 42.2wt%, polyisoprene c...

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Abstract

The invention discloses a styrene/isoprene/butadiene tri-component random copolymer of a rare-earth catalysis system and a preparation method thereof. The styrene/isoprene/butadiene tri-component random copolymer is characterized by comprising the following components in weight percent: 5%-55% of styrene, 10%-70% of isoprene, 10%-70% of butadiene, 70%-98% of 1,4-polyisoprene, 70%-98% of 1,4-polybutadiene and 35%cis-1,4-polybutadiene or more. The rare-earth catalysis system is prepared from rare-earth carboxylate, methyl aluminoxane (MAO), indene and butadiene under the protection of nitrogen. The tri-component random copolymer in the invention has the characteristics of high styrene content, high cis-structure content, high random distribution, narrow molecular weight distribution and the like.

Description

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Claims

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Application Information

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Owner DALIAN UNIV OF TECH
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