Preparing method for polycarboxylate water reducing agent

Abstract

The invention provides a preparing method for polycarboxylate water reducing agent. The polycarboxylate water reducing agent composed of, by weight, 30%-55% of deionized water, 35%-50% of polyoxyethylene ether, 5%-10% of carboxylic acid derivatives monomer, 0.0005%-0.002% of catalyst, 1.5%-4.5% of initiator, 0.2%-0.8% of chain transfer agent, 1.0%-2.5% of structure modifying agent and 4.5%-8.5% of alkali liquor. Under the temperature of 20-35 DEG C, the deionized water and the polyoxyethylene ether are enabled to be put in a reaction still to be dissolved, after the deionized water and the polyoxyethylene ether are fully dissolved, the carboxylic acid derivatives monomer, the catalyst, the initiator, the chain transfer agent and the structure modifying agent are enabled to be added in sequence, after stirring for 28-32 minutes, the mixed liquor still standings for 4-6 hours under room temperature, the alkali liquor is added in under a state of stirring, a potential of hydrogen (PH) value is adjusted to be 6.0-7.5, and then products are achieved.

Description

technical field [0001] The invention relates to a water reducer for concrete, and is especially suitable for the preparation method of a polycarboxylate water reducer. Background technique [0002] Concrete water reducing agent refers to the condition that the amount of cement and the slump of concrete are kept constant, which can save water consumption in the process of concrete mixing, improve the strength of concrete, or keep the slump of concrete and the compressive strength of concrete unchanged. It is a concrete admixture that can save the amount of cement. Since the water reducing agent is used in concrete, it not only greatly improves the various properties of concrete and prolongs the service life of the building, but also can effectively use industrial by-products such as fly ash and slag as cement-based composite materials, saving cement The consumption has achieved the goal of energy saving and consumption reduction of the enterprise. [0003] At present, when ...

AI Technical Summary

Problems solved by technology

However, under the conditions of low temperature and multi-component polymerization, the synthesis rate of the product is low, and the utilization rate of unsaturated dibasic acid and unsaturated sulfonate is low, resulting in waste of raw materials, poor dispersibility and slump retention of the product