Dispersant for nano-silica and preparation method

Abstract

The invention relates to a dispersant for nano-silica and a preparation method. The dispersant comprises in parts by mass: 30-45 parts of a sulfonate copolymer, 0.001-0.005 part of welan gum, 0.01-0.05 part of calcium hydroxide, 1-3 parts of a polycarboxylic acid water reducing agent, 0.01-0.05 part of triisopropanolamine, and the balance water. The preparation method of the dispersant comprises the following steps: uniformly mixing 0.001-0.005 part of the welan gum with water, then sequentially adding 0.01-0.05 part of calcium hydroxide, 0.01-0.05 part of triisopropanolamine, and 1-3 parts ofthe polycarboxylic acid water reducing agent, performing stirring for 10 min, finally adding 30-45 parts of the sulfonate copolymer, and performing stirring for 5 min to obtain the dispersant. The dispersant prepared by the method is mixed with a nano material, the nano material can be efficiently dispersed, and at the same time agglomeration during mixing is avoided, so that effects of nano silica are enhanced.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a dispersant for nano silicon dioxide and a preparation method. Background technique [0002] Nano-modification is an emerging technology developed in recent years. In recent years, there have been in-depth discussions on the related issues of nano-materials to improve the performance of building materials. Nano silicon dioxide (nano-SiO) with a particle size in the range of 1-100nm 2 , NS) has anti-ultraviolet optical properties, which can improve the anti-aging, strength and chemical resistance of the material. Nano-silica is amorphous white powder, non-toxic, tasteless, and pollution-free. The microstructure is spherical, and the flocculent and net-like quasi-particles of nano-silica are insoluble in water and easily agglomerated. Nano-silica is also the most widely researched and applied nano-material in the field of cement concrete. It can not only form a nano-crystal nu...

AI Technical Summary

Problems solved by technology

Nanomaterials are aggregated to form an agglomerated structure equivalent to the particle size of cement particles, and the activity is greatly reduced. At the same time, the pores between particles need to be filled with more hydration products, so that the filling, hydration reaction, and crystal nucleus of nanomaterials Effects and other effects are greatly reduced, manifested as failure of nanomaterials, and even the performance of concrete is reduced macroscopically.

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