Highly ripping-resistant high temperature sulfidation silicon rubber and method for making same
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A technology of high temperature vulcanization and silicone rubber, applied in the field of high tear resistance high temperature vulcanized silicone rubber and its preparation
Inactive Publication Date: 2008-04-09
SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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Embodiment 1
[0043] The preparation process of the high-tear-resistant high-temperature vulcanized silicone rubber of the present invention is as follows:
[0044] The first step: 100 parts by weight of low vinyl content methyl vinyl silicone rubber with a molecular weight of 600,000 and a vinyl molar content of 0.06%, 0.2 parts by weight of an internal release agent zinc stearate, a viscosity of 20 cps at 25°C, and a hydroxyl content of 8.0% 9.6 parts by weight of the structured control agent hydroxy silicone oil, put into the kneader and kneaded for 10 minutes;
[0045] The second step: put 48 parts by weight of T-40 white carbon black into the kneader for 5 times for kneading, the temperature is controlled below 80°C until the kneading is uniform and complete;
[0046] Step 3: transfer the mixture of step 2 to an internal mixer at 150-180°C for heat treatment for 3 hours;
[0047] Step 4: Park the rubber obtained in Step 3 for 1 to 2 hours, cool it down to below 120°C, and carry out th...
Embodiment 2
[0052] The T-40 silica in Example 1 was changed to N20 silica, the added hydroxy silicone oil was changed to 7.2 parts by weight, and the rest were the same as in Example 1 to obtain the silicone rubber composition (II).
Embodiment 3
[0054] The T-40 silica in Example 1 was changed to V-15 silica, the added hydroxy silicone oil was changed to 6.2 parts by weight, and the rest were the same as in Example 1 to obtain the silicone rubber composition (III).
[0055] See Table 1 for a comparison of their performance parameters.
[0056] Table 1
[0057]
[0058] Tensile strength (Mpa)
[0059] It can be seen from Table 1 that the larger the specific surface area of the fumed silica used, the greater the tear strength and tensile stress, and the correspondingly higher hardness of the product.
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Abstract
The invention relates to a high anti-tearing and high temperature vulcanized silicon rubber, which is made through mixing and vulcanization of peroxide vulcanization agent and a combination which uses methylvinyl silicone rubber as base adhesive. The combination, according to weight proportion, comprises 100 of methylvinyl silicone rubber with low vinyl content, 1 to 30 of hydroxyl silicone oil, 0.1 to 3 of inner mold release agent, 15 to 80 of reinforcement agent, 1 to 10 of methylvinyl silicone rubber with high vinyl content and 1 to 10 of hydrogen-containing silicone oil; wherein, the vinyl molar content of the low vinyl-content methyvinyl silicone rubber is 0.01 percent to 0.15 percent; the vinyl molar content of the high vinyl-content methylvinyl silicone rubber is 1 percent to 10 percent. The invention has the advantages that the high vinyl-content methylvinyl silicon rubber is added into the methylvinyl silicone rubber, leading unsymmetrical concentration-crosslinking or one place multiple crosslinking to be formed during sulfuration period and the silicone rubber to generate so large resistance at the place that the rubber is difficult to be torn. In addition, the broken and tensile strength of vulcanized silicon rubber products is up to 8.5 MPa, and the tear strength is up to 45 N/mm.
Description
technical field [0001] The invention relates to a high-tear-resistant high-temperature vulcanized silicone rubber and a preparation method thereof. A silicone rubber composition is prepared by kneading methyl vinyl silicone rubbers with different vinyl contents, and vulcanized to obtain a high-tear-resistant high-temperature vulcanized silicone rubber . Background technique [0002] High temperature vulcanized silicone rubber is one of the most important silicone products. The raw materials for preparing high-temperature vulcanized silicone rubber are usually obtained by kneading, mixing and filtering methyl vinyl silicone rubber (referred to as raw rubber), reinforcing fillers, structural control agents and various additives. It has excellent high and low temperature resistance, UV resistance, radiation resistance, weather resistance, electrical insulation, high air permeability, physiological inertia, low compression set and fatigue resistance, etc. Therefore, silicone ru...
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IPC IPC(8): C08L83/07C08J3/24C08K5/14
Inventor 陈辉戴宏程刘刚周鹏
Owner SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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