Modified heavy calcium carbonate for fire retardation electric cable material, and preparation method thereof

Abstract

The present invention provides modified heavy calcium carbonate for a fire retardation electric cable material. The modified heavy calcium carbonate is prepared from the following raw material components, by weight: 90-100 parts of heavy calcium carbonate, 0.2-0.5 part of butyl naphthalene sulfonate, 0.5-0.8 part of sodium alcohol ether sulphate, 1-2 parts of epoxidized triglyceride, 0.1-0.2 part of stearic acid, 0.1-0.2 part of barium stearate, 0.2-0.3 part of dimethicone. 1-2 parts of carboxymethyl cellulose, 0.6-0.8 part of alumina, 1-3 parts of triphenyl phosphate, and 1-2 parts of distearoyl isopropoxy aluminate. The preparation method comprises: drying calcium carbonate, adding other raw materials according to the ratio, completely mixing in a high speed stirrer, and carrying out drying and grinding to obtain the finished product. The obtained modified calcium carbonate has characteristics of good dispersity and good fire retardation, and can be used for fire retardation electric cable materials so as to reduce cost and improve various physical properties of the electric cable material.

Description

technical field [0001] The invention relates to the field of inorganic fillers, in particular to a modified calcium carbonate for flame-retardant cable materials and a preparation method thereof. Background technique [0002] Ground calcium carbonate is a commonly used inorganic filler. It is widely used in rubber, plastics, coatings and other fields due to its wide source and low price. However, the surface of heavy calcium carbonate is hydrophilic and oleophobic, the specific surface area is large, the surface energy is high, and the particles are easily agglomerated. When directly or in large quantities filled in organic matrix materials, it is not only difficult to disperse evenly, but also has a weak binding force with the matrix. , leading to two-phase interface defects and some performance degradation of composite materials. Therefore, in order to broaden its application field, it is necessary to modify the surface of heavy calcium carbonate to make its surface lipop...

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Problems solved by technology

However, the surface of heavy calcium carbonate is hydrophilic and oleophobic, the specific surface area is large, the surface energy is high, and the particles are easily agglomerated. When directly or in large quantities filled in organic matrix materials, it is not only difficult to disperse evenly, but also has a weak binding force with the matrix. , resulting in defects at the two-phase interface and some performance degradation of the composite

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