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Method for reinforcing grafted diene rubber by in-situ sol-gel method

A gel method, diene technology, applied in tire parts, rolling resistance optimization, transportation and packaging, etc., can solve the problems of limiting the swelling amount of tetraethoxysilane, unstable emulsion, weak force, etc. Strength, good workability, and the effect of ensuring stability

Active Publication Date: 2013-10-16
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the above-mentioned first method is that the swelling amount of tetraethoxysilane in styrene-butadiene rubber is limited due to the influence of the crosslinking density of the vulcanized rubber
The disadvantage of the second method is that a large amount of catalyst needs to be used, and at the same time, the silica particles produced by the tetraethoxysilane sol-gel method will interact with each other as time goes on due to the large number of hydroxyl groups on the surface, which will cause the emulsion to fail. Stablize
However, this document uses ST and MMA as grafting monomers in the process of grafting and modifying natural rubber, and the interaction between styrene-butadiene rubber grafted with ST and MMA and silica is relatively weak.

Method used

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  • Method for reinforcing grafted diene rubber by in-situ sol-gel method
  • Method for reinforcing grafted diene rubber by in-situ sol-gel method
  • Method for reinforcing grafted diene rubber by in-situ sol-gel method

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Experimental program
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Effect test

preparation example Construction

[0040] The preparation of pure rubber and vulcanized rubber. After the rubbers before and after the modification are respectively plasticized, they are mixed according to the formula in Table 1:

[0041] Table 1 Vulcanization formula

[0042]

[0043] Mix at room temperature and follow the procedure below:

[0044] (1) Adjust the roll distance of 1.1mm, pressing, 4min

[0045] (2) Add sulfur evenly, 2min

[0046] (3) Add stearic acid evenly, make 3 / 4 cutting knife once, 2min

[0047] (4) Add zinc oxide and accelerator, 3min

[0048] (5) Thin pass 6 times, 2min, remove the film

[0049] After mixing, park for more than 12 hours. The vulcanization time is determined according to the vulcanization curve. The vulcanization curve is determined by the JC-2000E rotorless vulcanizer of Jiangdu Jingcheng Instrument Factory. The vulcanization time is measured at 160°C. Finally, it is molded.

[0050] Tensile strength analysis According to GB528-1998, the tensile strength of pure rubber vulcanizate w...

Embodiment 1

[0057] In the container, add 380.00g styrene-butadiene rubber latex, heat up to 68℃, add 11.00g vinyl triethoxysilane and 0.15g benzoyl peroxide, add 50min, and then react at this temperature for 3.0h to obtain ethylene Benzene-butadiene rubber latex grafted with triethoxysilane. Then, at this temperature, 40g of tetraethoxysilane was added, and the dripping was completed in 60 minutes. Finally, a sol-gelation reaction occurred at 70°C for 4 hours. The latex was coagulated, mixed and vulcanized to obtain reinforced styrene butadiene rubber. The silicon dioxide content in the rear rubber was 10.95%, the silicon dioxide utilization rate was 78.85%, and the tensile strength of the pure rubber vulcanizate was 6.81MPa.

Embodiment 2

[0061] In the container, add 380.00g styrene-butadiene rubber latex, heat up to 75℃, add 8.00g dimethylvinylethoxysilane and 0.12g benzoyl peroxide, add 50min, then react at this temperature for 3.5h A methyl vinyl ethoxy silane graft-modified styrene butadiene rubber latex is obtained. Then, at this temperature, 6.00 g of tetraethoxysilane was added, and the dripping was completed in 60 minutes. Finally, a sol-gelation reaction occurred at 80°C for 4 hours. The latex was coagulated, mixed and vulcanized to obtain reinforced styrene butadiene rubber. The content of silica in the reinforced rubber is 4.76%, the utilization rate of silica is 88.86%, and the tensile strength of the pure rubber vulcanized rubber is 4.53MPa.

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Abstract

The invention discloses a method for reinforcing grafted diene rubber by an in-situ sol-gel method. The method comprises the following steps of: adding vinyl siloxanes and benzoyl peroxide into diene rubber latex, reacting for 2 to 6h at the temperature of between 68 and 80 DEG C to obtain vinyl siloxanes grafted and modified diene rubber latex, and adding tetraethoxysilane into the vinyl siloxanes grafted and modified diene rubber latex at the temperature of between 68 and 80 DEG C and performing sol-gel reaction to obtain in-situ reinforced butadiene styrene rubber. The silica-reinforced rubber prepared by the method has higher pure rubber and vulcanized rubber strength and good processability, and has a great significance for the processes of the rubber such as mixing, transportation, storage and the like. The problem of incompatibility of polar silica and rubber is solved to a certain degree, and a theoretical basis is provided for overcoming the contradiction between the reduction of rolling resistance of tyres and the improvement on wet skid resistance.

Description

Technical field [0001] The invention relates to a method for strengthening diene rubber, in particular to a method for in-situ sol-gel method to strengthen grafted diene rubber prepared by emulsion polymerization. Background technique [0002] Styrene butadiene rubber reinforced by fillers is used in many fields, such as seals, gaskets, tires, etc. Recently, it has also been widely used in radial tires. However, the unvulcanized rubber between the skeleton cords during the formation of radial tires needs to be able to withstand a deformation as large as three times its original size. In order to maintain the design accuracy of the tire size, the tire curtain The performance of the line-insertion rubber puts forward higher requirements, that is, the rubber material is required to have a sufficiently high green rubber strength and the stress energy increases with the increase of the deformation. [0003] Literature "Siti Hajjar, Che Man, Azanam S, et al,. Studies on the curing behav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L51/04C08K3/36C01B33/12C08F279/02B60C1/00
CPCY02T10/86
Inventor 魏绪玲尹常杰龚光碧张秋禹郑聚成梁滔尹德忠赵继忠艾纯金陈建刚
Owner PETROCHINA CO LTD
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