Method for preparing magnesium oxide filler for fireproof cable
A fire-resistant cable, magnesium oxide technology, applied to inorganic insulators, etc., to achieve the effect of simple production method, simple method and easy implementation
Inactive Publication Date: 2014-12-10
张传良
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Problems solved by technology
[0003] In view of the above-mentioned situation, the purpose of the present invention is to provide a kind of preparation method of the magnesia filler for cable with high insulation performance and simple production process, which solves the problems existing in the manufacture of products by existing preparation methods
Method used
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Embodiment 1
[0024] Take 100kg of yellow leather sand with a particle size of 0.075-0.25. Add 1.5kg of mullite powder and 1.5kg of cordierite powder. Stir to combine in a blender. Made of magnesium oxide filler.
[0025]
Embodiment 2
[0027] Take 100kg of yellow leather sand with a particle size of 0.08-0.2. Add 3kg of mullite powder, and stir and mix in the mixer. Made of magnesium oxide filler.
[0028]
Embodiment 3
[0030] Take 100kg of yellow leather sand with a particle size of 0.063-0.25. Add cordierite powder 4kg, stir and mix in the mixer. Made of magnesium oxide filler.
[0031]
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The invention discloses a method for preparing a magnesium oxide filler for a fireproof cable, relates to a magnesium oxide electrical insulating material and especially relates to a method for preparing the magnesium oxide filler for the fireproof cable. The method comprises the following steps of: preparing the magnesium oxide filler by adopting fused magnesium oxide yellow sand as a main raw material, and adding cordierite powder and mullite powder or their mixer. The method can be simply and easily implemented. The yellow sand is simple in production method and low in cost. Cordierite powder and mullite powder are regarded as excellent refractory materials and have the characteristics of uneven expansion, excellent thermal shock resistance, high loading and melting point, low high-temperature creep value, large hardness and excellent chemical resistance corrosion. The magnesium oxide filler has the excellent dielectric property, thus its insulating property is vastly superior to other fillers. The prepared magnesium oxide filler is greatly improved in the electrical property and insulating property, and the electric breakdown resistance property. Through the magnesium oxide filler, the problem of manufacturing the existing magnesium oxide filler for the fireproof cable is solved.
Description
technical field [0001] The invention relates to a magnesium oxide electrical insulating material, in particular to a preparation method of a magnesium oxide filling material for fireproof cables. Background technique [0002] At present, in the process of manufacturing fireproof cables, most of the magnesium oxide fillers used need to be imported, which is expensive and the cost of manufacturing cables is high. At present, the best magnesium oxide filler in China is made of white bark sand as the main raw material and other additives. Although the price of the magnesium oxide filler is lower than that of imported products, its insulation performance and electrical performance cannot meet the ideal requirements. Moreover, the manufacturing process is complicated. The white leather sand needs to be heated to 400 degrees Celsius in combination with other additives, and the heating time needs 1.5 hours. Like this, increased energy consumption and production cost again. Conte...
Claims
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Inventor 张传良于祥鹤
Owner 张传良