Nitrile rubber/modified silica-gel powder blend and preparation method thereof
A technology of nitrile rubber and silica gel powder, which is applied in the field of nitrile rubber/modified silica gel powder blend and its preparation, can solve the problems that the modification effect of silica gel powder is not obvious, and the molecular structure and chemical properties of silica gel powder are changed. , to achieve the effect of small mechanical properties, improved low temperature resistance, high temperature resistance and excellent aging resistance
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[0028] Example 1
[0029]
[0030]In the formula of Example 1, the nitrile rubber was first masticated in an open mill or an internal mixer for 3 minutes, zinc oxide, stearic acid and precipitated silica were added, and finally sulfur and tetrabenzyl thiuram disulfide were added. Mum, N-tert-butyl-2-benzothiazole sulfenamide and 2,5-dimethyl-2,5-(di-tert-butyl) peroxyhexane, the mixing temperature was controlled at 40°C, and the mixing The time is 15 minutes. Then, the above obtained blend was placed in a flat vulcanizer for molding, and the vulcanization temperature was controlled at 200° C. and the vulcanization time was 10 minutes.
[0031] The properties of the obtained pure nitrile rubber compound without silica gel powder are shown in Table 1.
Example Embodiment
[0032] Example 2
[0033]
[0034] In the formula of Example 2, in parts by weight, first place 100 parts of 100-mesh silica gel powder in an internal mixer or Hack rheometer, add 0.5 parts of dibenzoyl peroxide and 5 parts of maleic anhydride, Heating to 80° C., shearing and mixing for 25 minutes to obtain maleic anhydride modified silica gel powder.
[0035] The nitrile rubber is masticated in an open mill or an internal mixer for 3 minutes, zinc oxide, stearic acid and precipitated silica are added, then modified silica gel powder is added, and finally sulfur and tetrabenzylthiuram disulfide are added. , N-tert-butyl-2-benzothiazole sulfenamide, 2,5-dimethyl-2,5-(di-tert-butyl) peroxyhexane, the mixing temperature was controlled at 40°C, and the mixing time was for 30 minutes. Then, the obtained blend was placed in a flat vulcanizer for molding, and the vulcanization temperature was 200° C. and the vulcanization time was 10 minutes.
[0036] The properties of the obta...
Example Embodiment
[0037] Example 3
[0038]
[0039]
[0040] In the formula of Example 3, in parts by weight, first place 100 parts of 100-mesh silica gel powder in an internal mixer or Hack rheometer, add 1.0 parts of dibenzoyl peroxide and 5 parts of maleic anhydride, Heating to 80° C., shearing and mixing for 25 minutes to obtain maleic anhydride modified silica gel powder.
[0041] First, the nitrile rubber is masticated in an open mill or an internal mixer for 3 minutes, then zinc oxide, stearic acid and precipitated silica are added, then modified silica gel powder is added, and finally sulfur and tetrabenzyl thiuram disulfide are added. Mu, N-tert-butyl-2-benzothiazole sulfenamide, 2,5-dimethyl-2,5-(di-tert-butyl) peroxyhexane, the kneading temperature was controlled at 40°C, kneading The time is 25 minutes. Then, the above-obtained blend was placed in a flat-plate vulcanizer for molding, and the vulcanization temperature was 150° C. and the vulcanization time was 30 minutes.
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