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A method for producing branched modified rubber and a rubber composition comprising branched modified rubber prepared by the method, and use thereof

A technology of rubber composition and modified rubber, which is applied in the field of production of branched modified rubber, improved comprehensive hysteresis characteristics, and can solve problems such as limiting the selection of vulcanized rubber components

Active Publication Date: 2019-04-02
PUBLIC SIBUR HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Thus, known modification methods allow the production of rubbers that provide improved properties of vulcanizates only in combination with specific kinds of PSFs, which limits the choice of ingredients for the consumer to choose vulcanizates

Method used

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  • A method for producing branched modified rubber and a rubber composition comprising branched modified rubber prepared by the method, and use thereof
  • A method for producing branched modified rubber and a rubber composition comprising branched modified rubber prepared by the method, and use thereof
  • A method for producing branched modified rubber and a rubber composition comprising branched modified rubber prepared by the method, and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Example 1. (Comparison, according to prototype) Polymerization in the presence of n-butyllithium and pyrrolidine

[0097] Production of styrene-butadiene rubber in a 2L Buchi reactor with metal cups equipped with stirrer, jacket for temperature control, fittings and specific removable metal for feeding reagents feeder.

[0098] White spirit (984g), butadiene (92.62g), styrene (30.98g), DTHFP (4.0ml) in white spirit (0.32M solution) and 5.95ml white spirit were mixed under the stirrer rotation rate of 50rpm A solution of pyrrolidine (0.2M) was fed to the reactor cooled to -20°C (± 2°C) in nitrogen flow. The stirrer rotation rate was set to 300 rpm, the temperature of the reaction mass was raised to 55° C. at a rate of 7° / min, and when the temperature reached 15° C., 2.88 ml of n-butyllithium in white spirit ( 0.32M solution). After reaching the desired monomer conversion (100%), the polymer was transferred to a cup and filled with the antioxidant Novantox (0.4% by wei...

Embodiment 2

[0100] Example 2. (Comparison, according to prototype) Polymerization in the presence of n-butyllithium and oligosiloxane Coatosil MP-200

[0101] Oligomeric siloxane Coatosil MP-200 has the following structure:

[0102]

[0103] Production of styrene-butadiene rubber in a 2L Buchi reactor with metal cups equipped with stirrer, jacket for temperature control, fittings and specific removable metal for feeding reagents feeder.

[0104] Petroleum solvent (987 g), butadiene (100.6 g), styrene (33.38 g) and DTHFP (2.9 ml) in petroleum solvent (0.32 M solution) were fed into the nitrogen stream at a stirrer rotation rate of 50 rpm Cool the reactor to -20°C (±2°C). The stirrer rotation rate was set to 300 rpm, the temperature of the reaction mass was raised to 55° C. at a rate of 7° / min, and when the temperature reached 15° C., 2.5 ml of n-butyllithium in petroleum solvent ( 0.305M solution). After reaching the desired monomer conversion (100%), the reaction mixture was heated...

Embodiment 3

[0106] Example 3 (comparative, according to prototype) Polymerization in the presence of n-butyllithium and oligosiloxane Silres HP1250

[0107] Oligomeric siloxane Silres HP1250 has the following structure

[0108]

[0109] Styrene-butadiene rubber was prepared according to the procedure described in Example 1, except that the oligosiloxane used was a product under the trade name Silres HP1250, which was added in an amount of 0.3% by weight to the obtained rubber, which uses a 5% toluene solution.

[0110] The properties of the rubber are given in Table 1. The characteristics of the tread rubber obtained from this rubber are shown in Table 2.

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Abstract

Present invention relates to a method for producing a branched modified rubber, comprising an anionic (co)polymerization of a conjugated diene and / or a vinyl aromatic compound in the presence of an initiator and a polyfunctional modifying agent, wherein the initiator represents a compound which is a reaction product of an organolithium compound and a secondary amine, and the modifying agent is anoligo- or polysiloxane containing in its structure both epoxy and alkoxy functional groups. The invention also relates to branched modified rubber based on a conjugated diene and / or a vinyl aromatic compound produced by said method, and to a rubber composition, comprising such branched-modified rubber. Rubber compositions according to the present invention are suitable in manufacture of a tire treads.

Description

technical field [0001] The present invention relates to the field of manufacturing rubber and vulcanizates based thereon, characterized by an improved complex of hysteresis properties. In particular, the present invention relates to a process for the production of branched modified rubbers by anionic solution polymerization using polyfunctional oligosiloxane or polysiloxane modifiers in the presence of lithium amides as initiators. Rubbers modified according to the invention have increased compatibility with fillers such as precipitated colloidal silicic acid (silica, PSF), and allow production with improved hysteresis properties, especially with reduced hysteresis loss at 60°C and good tensile stress-strain properties; such vulcanizates are used in the tire industry as tread rubber, and in the manufacture of mechanical rubber goods. Background technique [0002] Processes for the production of modified rubbers by solution polymerization of conjugated dienes and vinylaromat...

Claims

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Application Information

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IPC IPC(8): C08F4/48C08F36/14C08F136/14C08F236/14C08C19/25C08L9/00
CPCC08C19/25C08F2410/01C08L7/00C08C19/22C08L15/00C08F236/10C08F4/48C08L91/00C08K5/18C08L91/06C08K3/22C08K5/09C08K5/548C08K5/31C08K5/47C08K3/06C08K3/04C08K3/36C08F36/14C08F136/14C08F236/14C08L9/06
Inventor 阿列克谢·米哈伊洛维奇·阿韦尔科夫亚历山大·弗拉基米罗维奇·兹洛宾斯维特拉娜·维克托罗夫娜·图连科叶卡捷琳娜·瓦西里耶芙娜·哈尔拉莫娃
Owner PUBLIC SIBUR HLDG
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