A kind of retarding type water reducing agent for phosphorus construction gypsum and its preparation method

Abstract

The invention relates to a slow-setting water reducer for phosphorus building gypsum and a preparation method thereof, which is composed of the following ingredients in proportions by weight: 90-100 parts of polycarboxylic acid-based mother liquor or melamine-based mother liquor, 9-20 parts of borax , 0.2-1.0 parts of retarder, 0-1.5 parts of cellulose ether, 0.1-0.2 parts of suspension stabilizer, 0.1-1 part of defoamer and 90-100 parts of water. The preparation method of the water reducing agent is as follows: S1, prepare polycarboxylic acid-based mother liquor or melamine-based mother liquor; S2, prepare cellulose nanospheres; S3, then add borax and retarder to polycarboxylic acid-based mother liquor or melamine-based mother liquor in sequence , cellulose ether, defoamer, suspension stabilizer, and stir evenly to obtain the target water reducer. The water reducing agent of the present invention has the multiple effects of retarding, reducing water consumption and water resistance, with less added amount, remarkable effect and low cost, and can be used in phosphorus building gypsum powder and other industrial by-product building gypsum powder.

Description

technical field [0001] The invention relates to a retarding water reducer for phosphorus building gypsum and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] Phosphogypsum is an industrial waste residue produced in the process of wet-process phosphoric acid production, and about 4-5 tons of phosphogypsum are discharged for every ton of phosphoric acid produced. At present, the preparation of phosphogypsum into phosphogypsum by modification treatment and other gypsum products has become an effective way for phosphogypsum resource treatment and disposal. However, the setting and hardening speed of phosphorus building gypsum is very fast, and the setting time is only a few minutes (initial setting) to ten minutes (final setting). After adding water and mixing, it quickly loses its fluidity and cannot meet the requirements of normal construction. The setting time is adjusted by adding retarding water reducing ag...

AI Technical Summary

Problems solved by technology

However, the setting and hardening speed of phosphorus building gypsum is very fast, and the setting time is only a few minutes (initial setting) to ten minutes (final setting). After adding water and mixing, it quickly loses its fluidity and cannot meet the requirements of normal construction. Adding retarding water reducer to adjust the setting time, so that the gypsum slurry can maintain plasticity for a long time, so as to meet the construction requirements

At present, the commonly used construction gypsum retarding water reducer is organic acid and soluble salt, the dosage is small, and the retarding effect is good, but this kind of retarding water reducer will cause serious loss of strength of gypsum products, so it is limited to a certain extent. The popularization and application of gypsum building materials

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