Polycarboxylic acid-series water reducing agent with ultrahigh water absorbing capacity and preparation method and use method thereof

Abstract

The invention discloses a polycarboxylic acid-series water reducing agent with ultrahigh water absorbing capacity and a preparation method and a use method thereof, belonging to the technical field of building materials. The water reducing agent consists of the following raw materials in parts by weight: 100 parts of unsaturated polyether (I), 10-18 parts of acrylic acid, 1-3 parts of acrylamide,1.25-9.25 parts of aconitic acid, 0.45-2.25 parts of hydrogen peroxide, 0.15-0.75 part of L-ascorbic acid, 0.12-0.48 part of mercaptoacetic acid, 0.12-0.48 part of mercaptopropionic acid, 6-10 parts of sodium hydrate and 125-195 parts of water. The invention provides a polycarboxylic acid-series water reducing agent having the advantages of simple process, convenience for operating, low raw material cost and ultrahigh water absorbing capacity, a preparation method and a use method. Self-made unsaturated polyether (I) DD-405 is used for replacing methyl allyl polyethenoxy ether, so that the raw material supply market of the polycarboxylic acid-series water reducing agent is expanded, raw material cost is reduced, and raw material price is stabilized. The polycarboxylic acid-series water reducing agent is suitable for construction projects of high-rise buildings, large-span bridges, marine drilling platforms, tunnels, dams and airports.

Description

technical field [0001] The invention relates to a polycarboxylate water-reducer with an ultra-high water-reducing rate, a preparation method and a use method thereof; it belongs to the use of polymer materials as effective components of mortar concrete and is applied in the technical field of building materials. Background technique [0002] The strength of cement concrete is closely related to the amount of water added when mixing concrete. A large amount of water is beneficial to improve fluidity and facilitate construction, but the strength of concrete will decrease significantly with the increase of water consumption. Therefore, water reducing agent is an important cement concrete additive. [0003] High-performance concrete has become an important direction of concrete development because of its high fluidity, high strength and high durability. Water reducer is an indispensable component for the preparation of high-performance concrete. Among the many types of water re...

AI Technical Summary

Problems solved by technology

[0005] Before 2009, the methods of "polyethylene glycol monomethyl ether esterification macromonomer + mixed monomer polymerization" and "allyl polyethylene glycol + mixed monomer polymerization" were adopted by more cement admixture manufacturers The synthesis method, the former not only has a complicated process, the esterification process is difficult to control, and the esterification product has a great impact on the performance of the polymerization reaction and the final product, but also has high raw material costs and lacks market competitiveness; the latter process does not require two-step synthesis, and The price of raw materials is low, but the product performance is not as good as the former

Since 2009, with the introduction of methene butyl polyoxyethylene ether, the synthesized polycarboxylic acid-based water reducer has excellent performance and simple production process, which is popular in the market, but the production of methene butyl polyoxyethylene ether The initiator prenol of oxyethylene ether is controlled by Kuraray of Japan and BASF of Germany, and the product supply and price fluctuate greatly, which cannot meet the growing demand of the market

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