Modified rubber compound and its preparation method and vulcanized rubber and its application
A technology of modified rubber and vulcanized rubber, which is applied in the preparation of modified rubber compounds, the application of vulcanized rubber to prepare tires, vulcanized rubber, and modified rubber compounds. Abrasion resistance, good wet skid resistance, effect of reducing rolling resistance
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[0015] The present invention provides a method for preparing a modified rubber compound. The method includes: (1) under a first mixing condition, a rubber and an alkylphenol disulfide are contacted for the first time to obtain a modified rubber; The first mixing conditions include: mixing temperature of 70-150°C, mixing time of 5-30 minutes; (2) under the second mixing conditions, combining the modified rubber, silica and coupling The agent is contacted for the second time to obtain a modified rubber compound. Preferably, the first mixing conditions include: a mixing temperature of 120-140°C, and a mixing time of 15-25 minutes.
[0016] According to the present invention, contacting the alkylphenol disulfide and rubber under mixing conditions can improve the surface properties of the rubber and facilitate the dispersion of the silica during mixing with the silica. The reason may be that the disulfide bond in the alkylphenol disulfide chemically reacts with the double bond in the...
Embodiment 1
[0037] 100 grams of solution polymerized styrene butadiene rubber (weight average molecular weight of 500,000) and 4 grams of p-tert-butylphenol disulfide (Arkema, Vultac2) were mixed for the first time. The first mixing conditions included: the mixing temperature was 140 ℃, the first mixing speed is 45 revolutions / minute, and the mixing time is 20 minutes to obtain a modified rubber.
[0038] Then 60 grams of white carbon black (specific surface area of 115m 2 / g) and 4.2 grams of bis-(γ-triethoxysilylpropyl)-tetrasulfide and the above modified rubber for the second mixing. The second mixing conditions include: the mixing temperature is 155℃, the second The mixing speed is 50 revolutions per minute and the mixing time is 10 minutes to obtain the modified rubber compound M1.
Embodiment 2
[0042] 100 grams of cis-polybutadiene rubber (weight-average molecular weight of 200,000) and 5 grams of p-tert-amylphenol disulfide (Arkema, Vultac TB7) were subjected to the first mixing. The first mixing conditions included: mixing The temperature is 130°C, the first mixing speed is 50 revolutions per minute, and the mixing time is 18 minutes to obtain a modified rubber.
[0043] Then 50 grams of white carbon black (specific surface area is 175m 2 / g) and 2.5 grams of bis-(γ-triethoxysilylpropyl)-disulfide and the above modified rubber for the second mixing. The second mixing conditions include: the mixing temperature is 165℃, the second The mixing speed is 40 revolutions per minute, and the mixing time is 15 minutes to obtain the modified rubber compound M2.
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