Preparation method of auxiliary agent for improving compatibility of water reducing agent and retarder in cement mortar

Abstract

The invention discloses a preparation method of an auxiliary agent for improving compatibility of a water reducing agent and a retarder in cement mortar, which comprises the following steps: taking modified polyether as a large monomer, taking acrylic acid as a small monomer, adding maleic anhydride and vinyl phosphonic acid as comonomers, taking hydrogen peroxide as an initiator, taking thioglycollic acid and thiohydracrylic acid as transfer agents, carrying out reaction synthesis by using vitamin C as a reducing agent to obtain auxiliary mother liquor; dehydrating the assistant mother liquor to obtain mother liquor powder; and mixing the mother liquor powder with calcium hydroxide and calcium formate, adding a suspension stabilizing aid, and stirring to obtain the aid for improving the compatibility of the water reducing agent and the retarder in the cement mortar. The additive is obtained by changing a synthesis process and performing physical compounding, the compatibility problem of a water reducing agent and a retarder can be remarkably improved, the dosage of the additive is 20-40% of the dosage of the water reducing agent, the initial fluidity is increased, the fluidity retention performance is enhanced, and the additive has certain early strength components and cannot cause adverse effects on the early strength of mortar.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of an auxiliary agent for improving the compatibility of a water reducing agent and a setting retarder in cement mortar. Background technique [0002] Cement-based self-leveling and repair mortars often encounter problems caused by the compatibility of retarders and polycarboxylate superplasticizers during the production process, such as reduced fluidity, resulting in poor construction performance and shortened fluidity retention time , resulting in shortened construction time and poor use effect. The general solution is to increase the amount of water reducing agent to increase its initial fluidity and fluidity retention time, but excessive water reducing agent has a great impact on the early strength, and it is easy to cause the slurry to lag and bleed to the bottom. Contents of the invention [0003] The technical problem mainly solved by the...

AI Technical Summary

Problems solved by technology

[0002] Cement-based self-leveling and repair mortars often encounter problems caused by the compatibility of retarders and polycarboxylate superplasticizers during the production process, such as reduced fluidity, resulting in poor construction performance and shortened fluidity retention time , resulting in shortened construction time and poor use effect

The general solution is to increase the amount of water reducing agent to increase its initial fluidity and fluidity retention time, but excessive water reducing agent has a great impact on the early strength, and it is easy to cause the slurry to lag and bleed.