Preparation method of alkalescent liquid accelerator

Abstract

The invention relates to the field of building materials, in particular to a method for preparing a weak base liquid quick-setting agent. When preparing, first add sodium hydroxide, potassium hydroxide, and aluminum hydroxide into water in proportion, and react at a temperature of 95-120°C for 2-3 hours to obtain the aluminate mother liquor; first dissolve sodium fluoride in water, At a certain temperature, silicate is added to the aqueous solution to obtain a modifier; finally, the modifier is added dropwise to the aluminate composite mother liquor, and after fully reacting, the novel low-alkali liquid quick-setting liquid of the present invention is obtained agent. The quick-setting agent of the invention has the characteristics of short setting time, low alkali content and good cement adaptability.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing a weak base liquid quick-setting agent. Background technique [0002] Accelerator is an admixture that can quickly set and harden concrete or mortar. It is mainly used in shotcrete and mortar machine plugging and emergency projects. The liquid quick-setting agent for shotcrete improves the shortcomings of uneven powder mixing, large dust and poor construction environment, accelerates the setting of the concrete mixture, and improves the early strength, which can increase the thickness of the sprayed layer and shorten the next spraying time. Time has greatly expanded its scope of use. [0003] Liquid accelerators mainly include alkali-free liquid accelerators and aluminate liquid accelerators, and their effects are significantly different from those of mineral components in cement. The main component of non-alkali liquid quick-setting agent is sulfoalumin...

AI Technical Summary

Problems solved by technology

The main component of non-alkali liquid quick-setting agent is sulfoaluminate, because its price height, dosage are big (4~10%), early strength is low, thereby has influenced the extensive use of material, as CN00816806.7 will sulfuric acid Aluminum and amorphous aluminum hydroxide are dissolved in water containing amine, and the non-alkali liquid quick-setting agent synthesized by adding a non-alkaline salt stabilizer has a dosage of 7% to Portland cement; CN200910028321.1 uses aluminum sulfate and Metal sodium fluoride is the main component, and some amine substances and regulators are added to prepare the alkali-free accelerator, which has high cost, large dosage, and precipitation and flocculation after long-term storage; patent CN200580046556.3 is based on fluorine-containing Sodium chloride aluminum complex aqueous solution is a liquid coagulant as the main component. Although it has good low temperature stability, its synthetic raw material HF is highly corrosive and seriously damages human teeth and bones.

[0004] The traditional aluminate liquid quick-setting agent has a single component, high alkali content, and poor adaptability to ordinary Portland cement, so the scope of application is limited

Such as U.S. Patent US4046584 liquid quick-setting agent is a composite quick-setting agent of sodium aluminate and potassium aluminate, which greatly improves the phenomenon that sodium aluminate liquid is easy to precipitate during long-term storage, but its cement adaptability is poor, and it increases the copolymer into the Its modification increases the cost of the liquid quick-setting agent. Patent US4504345 reports a liquid quick-setting agent prepared from potassium aluminate and potassium carbonate. The alkali content of this product exceeds 20%, and the cost is high, which is not conducive to large-scale Scale promotion and use

[0005] Aiming at the poor adaptability of aluminate liquid quick-setting agent to cement, most of the domestic work focuses on the composite modification of silicate and carbonate, such as the patent CN200910183568.0 low-alkali liquid quick-setting agent and CN200910183428.3 modified aluminum Acid acid low-alkali liquid accelerator, and high shear conditions are demanding, conventional methods are difficult to achieve, and water needs to be added immediately when gel appears in the middle of the reaction, the control process is complicated, especially the cost of using mixers and homogenizers is high , it is difficult to meet large-scale industrial production