Colloidal antimony oxide powder low in volatility at high temperature and preparing method thereof

Abstract

The invention relates to colloidal antimony oxide powder low in volatility at high temperature and a preparing method thereof. The colloidal antimony oxide powder is made by 1, performing reduction, to be specific, adjusting pH value of antimony pentoxide hydrosol to 7.0 to 8.0 via alkali metal hydroxide, and adding reducing agent to allow partial reduction to obtain antimony oxide sol; 2, removing alkali metal ions, to be specific, removing the alkali metal ions in the antimony oxide sol by ion exchange; 3, performing drying, to be specific, drying the antimony oxide sol with the alkali metal ions removed, to obtain the colloidal antimony oxide powder low in volatility at high temperature. The colloidal antimony oxide powder has lower crystal water content than common colloidal antimony pentoxide powder, the high-temperature burning loss rate of the colloidal antimony pentoxide powder made by the conventional methods is decreased from 16% to 6% below, and high-temperature heating performance is excellent; when heated to 400 DEG C, the colloidal antimony oxide powder never carbonizes or blackens and has stable white appearance; the preparation process is easy to control and has no three wastes.

Description

technical field [0001] The invention relates to an antimony oxide dry powder and a preparation method thereof, in particular to a colloidal antimony oxide dry powder with low volatility at high temperature and a preparation method thereof. Background technique [0002] Antimony trioxide and antimony pentoxide are widely used as flame retardant additives for flammable materials such as plastics, chemical fibers, rubber, cotton and linen fabrics, paints and copper clad boards. Colloidal antimony pentoxide or colloidal antimony trioxide has extremely fine particle size, large surface area, high activity, high permeability, high adhesion, and does not affect the coloring degree. Therefore, it is a kind of flame retardant with excellent performance. additive. Due to its coarse particle size, antimony trioxide cannot be compared with colloidal antimony pentoxide or colloidal antimony trioxide dry powder as a flame retardant additive. The preparation method of colloidal antimony ...

AI Technical Summary

Problems solved by technology

Due to its coarse particle size, antimony trioxide cannot be compared with colloidal antimony pentoxide or colloidal antimony trioxide dry powder as a flame retardant additive

The preparation method of colloidal antimony trioxide usually adopts antimony trioxide to be dissolved in an organic solvent, and then the colloidal antimony trioxide in the organic medium is obtained by replacement, but because it contains an organic carbon source, it will be carbonized and blackened at high temperature, and Colloids contain large amounts of water or organic solvents, which limit their use in many applications

The making of existing antimony pentoxide dry powder generally all is to make sol earlier, then drying obtains, because antimony pentoxide is with Sb 2 o 5 3.5H 2 It exists in the form of O, that is, the crystal water accounts for about 16.3%. This part of crystal water will decompose and volatilize when heated at high temperature. When it is added as a flame retardant additive under high temperature heating conditions, it will cause micropores in the finished product and rough surface. , dull phenomenon, affecting product appearance and use