To provide a hydrous silicic acid having not only a rubber reinforcing performance obtained based on the BET specific surface area but also a rubber reinforcing performance, particularly abrasion resistance, which is added through improvement in the dispersibility of the hydrous silicic acid in the rubber.SOLUTION: A hydrous silicic acid for rubber reinforcing and filling has a BET specific surface area in the range of 230 to 350 m/g. After dispersion of 50 ml of the hydrous silicic slurry adjusted to 4 wt.% with an ultrasonic homogenizer having an output of 140 W for 10 minutes, the volume average particle diameter (D50) is 3.0 μm or less measured by laser diffraction method, and the particles in the top 10% in particle size distribution (D90) is 10.0 μm or less.SELECTED DRAWING: Figure 1
【課題】BET比表面積により得られるゴム補強性能に加えて、含水ケイ酸のゴム中への分散性が改良されることで性能が付加されるゴム補強性能、特に耐摩耗性を有する含水ケイ酸を提供する。【解決手段】BET比表面積が230〜350m2/gの範囲であり、4重量%に調整した含水ケイ酸スラリー50mlを出力140Wの超音波ホモジナイザーで10分間分散した後の、レーザー回折法で測定した体積平均粒子径(D50)が3.0μm以下であり、かつ粒度分布における上位10%の粒子(D90)が10.0μm以下である、ゴム補強充填用含水ケイ酸。【選択図】図1
HYDROUS SILICIC ACID FOR RUBBER REINFORCEMENT AND FILLING
ゴム補強充填用含水ケイ酸
2020-02-20
Patent
Electronic Resource
Japanese
Rubber mixtures containing silicic acid and sulfur-containing additives
European Patent Office | 2017
|Rubber mixtures containing silicic acid and sulfur-containing additives
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