Low-temperature high-concentration polycarboxylic acid water reducing agent and preparation method thereof

Abstract

The invention discloses a preparation method of a low-temperature high-concentration polycarboxylic acid water reducing agent. The low-temperature high-concentration polycarboxylic acid water reducing agent is prepared by copolymerizing 80-90 wt% of methylalkenyl polyoxyethylene and polyoxypropylene ether and 10-20 wt% of acrylic acid at 0-15 DEG C by a single-tank sectional dropwise addition process under the action of an ammonium persulfate-ferrous sulfate redox initiation system. The product concentration is up to 65%. The method has the advantages of simple production technique and low raw material cost, and is suitable for producing the high-concentration polycarboxylic acid water reducing agent under the condition of zero heat source in winter in northern China; and the concentration of up to 65% greatly lowers the transportation cost of the water reducing agent mother solution, and thus, the method has obvious economic benefit and social benefit. The polycarboxylic acid water reducing agent prepared by the method has the advantages of high water reducing rate, favorable slump holding capacity of the prepared concrete, and high environment adaptability.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a preparation method of a low-temperature high-concentration polycarboxylate water reducer and the prepared polycarboxylate water reducer. Background technique [0002] In recent years, with the construction of major national construction projects in our country, the requirements for the technology, environmental protection and durability of building materials are higher. Polycarboxylate high-performance water reducer is a high-tech construction product that has developed rapidly in China in recent years. It is a key research and development product in the field of building materials in various countries. To a certain extent, it has become a development symbol of the technical level and construction level in the construction field. The development trend of the industrialized production process of polycarboxylic acid-based high-performance water reducers is from two-step product...

AI Technical Summary

Problems solved by technology

Although the reaction process does not require heating, in industrial production, when the initial reaction temperature is lower than 15°C or the reaction concentration exceeds 60%, it is easy to cause the problem of inability to react

The water reducer synthesized by this method is only suitable for the production of polycarboxylate water reducer with normal concentration at room temperature, and cannot meet the production requirements for the production of low temperature and high concentration polycarboxylate water reducer

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