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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AI-Extracted Technical Summary

Problems solved by technology

[0012] Thus, known modification methods allow the production of rubbers that provide improved properties of vulcanizates onl...
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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.

Technology Topic

Conjugated dieneOrganolithium compounds +3

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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(9)
  • Effect test(1)

Example Embodiment

[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 weight per 100 g polymer). Furthermore, the rubber was subjected to aqueous degassing in an oil bath at 150°C. The resulting hydrous rubber was dried on rolls at a temperature of 85°C.
[0099] 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.

Example Embodiment

[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 to 80 °C and 1.9 ml of a branching and modification reagent (Coatosil MP-200) in toluene (0.1 M solution) was added , and the branching and modification process was carried out for 30 minutes. The polymer was then transferred to a cup and filled with the antioxidant Novantox (0.4% by weight per 100 g of polymer). Furthermore, the rubber was subjected to aqueous degassing in an oil bath at 150°C. The resulting hydrous rubber was dried on rolls at a temperature of 85°C.
[0105] 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.

Example Embodiment

[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.

PUM

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