A kind of modified talc used for fire-proof and flame-retardant coating and its manufacturing method

Abstract

The invention relates to modified talc for a fireproof flame-retardant coating. The SBDY-1 whiteness of the product is more than or equal to 89 percent, the 5-micron fineness content of talc particles in dispersion is more than or equal to 50 percent, and the modified talc accounts for 40-60 mass percent in the fireproof flame-retardant coating. The manufacturing method of the modified talc comprises the following steps: selecting a talc raw material of which the ignition loss is in a range from 8 percent to 14 percent, the purity of talc is over 75 percent and which has a natural sheet structure, oscillating, cleaning, performing far-infrared drying, hammering, crushing, preliminarily grinding to the granularity of 325 meshes, preliminarily mixing with silane hydrolysate, blending the preliminary mixture with a polyhydroxylated compound and acid form ammonium salt with the same granularity, finely grinding to the granularity of 1250 meshes, and performing secondary adsorption modification on the mixture and the silane hydrolysate; and performing screw propulsion, uniformly stirring to pass through a square hole sieve with the granularity of 20 meshes, pressurizing, and extruding, thereby obtaining the prismatic granular product. The modified talc has high hydrophilcity and is easy to disperse in an aqueous phase; and moreover, the functions of dehydrating catalysis and foaming are integrated into a whole, and three effects such as flame retardance, smoke abatement and synergism of the fireproof flame-retardant coating are combined into a whole.

Description

technical field [0001] The invention relates to the technical field of manufacture and application of talc products, in particular to a modified talc product used for fire-resistant and flame-retardant coatings and a manufacturing method thereof. Background technique [0002] Chemical name of talc: hydrated magnesium silicate; molecular formula: 3MgO 4SiO 2 ·H 2 O. Talc has the characteristics of low hardness, high whiteness, lipophilic and hydrophobic, lubricating, and flake particle shape similar to kaolin, and is often used as a functional filler in the coatings industry. [0003] The talc material used in coatings is usually made by dry-mechanically pulverizing the talc raw material, and then undergoing a particle size classification process to produce a powder product that meets the fineness requirements. However, the powdered product processed in this way can be used as a general filler, but its function is single, and it does not make much contribution to the impro...

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Problems solved by technology

However, the powdered product processed in this way can be used as a general filler, but its function is single, and it does not contribute much to the improvement of the overall performance of the final coating product.

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