Modification method and device for heavy calcium carbonate special for wires and cables

Abstract

The invention relates to a modification method for heavy calcium carbonate special for wires and cables. The modification method is characterized by including the following steps that heavy calcium carbonate is added into a grinding device and ground into fine powder with the average particle size being 1500-2000 meshes; water, stearic acid, an aluminate coupling agent and polyester type hyperdispersant are added into the powder through four feeding pipes respectively and are stirred to form a mixture, wherein the water, stearic acid, the aluminate coupling agent and the polyester type hyperdispersant account for 0.4-0.5%, 0.9-1.1%, 1-1.2% and 0.5-0.8% of the total weight of the mixture respectively. The modification method has the advantages that the time for modifying heavy calcium carbonate is shorter due to the function from inside to outside, modification is more sufficient, modified heavy calcium carbonate has heat resistance and dispersity, and can be compatible with a resin organic carrier and a high polymer material, so that toughness, brightness, plastic thermal hysteresis performance and bending strength of wires and cables are improved, and light resistance and ageing resistance are enhanced.

Description

technical field [0001] The invention belongs to the field of mineral powder chemical industry, in particular to a special heavy calcium carbonate modification method and device for electric wires and cables. Background technique [0002] Ground calcium carbonate is a very important functional inorganic filler, which is widely used in the fields of plastics, rubber, coatings and papermaking industries. However, calcium carbonate particles have strong hydrophilic carboxyl groups distributed on the surface, which have different interfacial properties and poor compatibility with the organic polymer matrix material, making it difficult to disperse evenly in the matrix material and form a strong binding force with the matrix material, resulting in two The interface defects between materials reduce some mechanical properties of composite materials, and the ground calcium carbonate used for wires and cables needs to have good compatibility and phase plasticity with resin organic car...

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Problems solved by technology

However, calcium carbonate particles have strong hydrophilic carboxyl groups distributed on the surface, which have different interfacial properties and poor compatibility with the organic polymer matrix material, making it difficult to disperse evenly in the matrix material and form a strong binding force with the matrix material, resulting in two The interface defects between materials reduce some mechanical properties of composite materials, and the ground calcium carbonate used for wires and cables needs to have good compatibility and phase plasticity with resin organic carriers and polymer materials, so heavy calcium carbonate needs to be Calcium carbonate is modified, usually just add stearic acid series modifier, this kind of modification effect is not good

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