Method for preparing sodium water glass binders

Abstract

The invention discloses a method for preparing sodium water glass binders. The method includes steps of (1), mixing sodium water glass, silica sol and water with one another and stirring the sodium water glass, the silica sol and the water to obtain mixed solution; (2), placing the mixed solution in a reactor, carrying out reaction at the temperatures of 95-180 DEG C for 1-2 h and taking out reaction products when the temperatures of the reaction products reach the room temperature so as to obtain the sodium water glass binders. Compared with the prior art, the method for preparing the sodium water glass binders has the advantages that the reaction is carried out on the mixed solution of the sodium water glass, the silica sol and the water at the temperatures in the range from 95 DEG C to 180 DEG C to obtain the sodium water glass binders which are high in transparency and molar ratio, accordingly, the water resistance of the sodium water glass binders can be improved after the sodium water glass binders are dried, and problems of turbid products or incapability of carrying out reaction due to excessively low temperatures, side reaction and large quantities of precipitates due to excessively high temperatures, tedious post-treatment procedures, decrease of product yields and the like can be solved; the sodium water glass and the silica sol which have different molar ratios are selectively fed and added, and accordingly the sodium water glass binders which are products and have required molar ratios can be obtained.

Description

Technical field [0001] The invention relates to the preparation of a binder, and in particular to a preparation method of a sodium water glass binder. Background technique [0002] Water glass is the general name for silicate aqueous solution. It is a mineral binder and its chemical formula is R. 2 O·nSiO 2 , where R 2 O is an alkali metal oxide, n is the ratio of moles of silicon dioxide to alkali metal oxides, which is called the mole number of water glass. The water glass commonly used in construction is sodium silicate (Na 2 O·nSiO 2 ) aqueous solution is called sodium water glass. Sodium water glass is an alkali metal silicate inorganic material. It has film-forming properties after drying in liquid form and is cheap and easy to obtain. It is widely used in the fields of chemical production and machinery manufacturing, especially in the field of adhesives for coatings. It has high environmental protection and has attracted more and more attention from people. At ...

AI Technical Summary

Problems solved by technology

But the Na of the sodium silicate produced by these two methods 2 The proportion of O in the solid content is too high, that is, the modulus of sodium silicate glass is low, resulting in poor water resistance after the liquid sodium silicate glass is dried and formed into a film. As a binder for coatings, it will appear anti-alkali and powder drop after a long time and other phenomena