Colloidal antimony oxide dry powder with low volatility at high temperature and preparation method thereof

Abstract

A low-volatility colloidal antimony oxide dry powder at high temperature and its preparation method. The colloidal antimony oxide dry powder is prepared according to the following method: (1) Reduction: adjust the pH value of antimony pentoxide hydrosol with alkali metal hydroxide After reaching 7.0 to 8.0, add a reducing agent for partial reduction to obtain antimony oxide sol; (2) Removal of alkali metal ions: remove alkali metal ions in the antimony oxide sol obtained in step (1) by ion exchange; (3) dry : drying the antimony oxide sol after removing alkali metal ions to obtain colloidal antimony oxide dry powder with low volatility at high temperature. The crystallization water content of the colloidal antimony oxide dry powder of the present invention is lower than that of the commonly used colloidal antimony pentoxide dry powder, and the ignition loss rate at high temperature is reduced from 16% to less than 6% of the colloidal antimony pentoxide dry powder prepared by conventional methods, and has excellent high temperature Heating performance; when heated to 400°C, it will not carbonize and turn black, and has a stable white appearance; the preparation process is easy to control, and there is no three wastes generated.

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