Polycarboxylic acid water reducing agent prepared from poly(ethylene glycol) ethyl ether, and preparation method and using method for polycarboxylic acid water reducing agent

Abstract

The invention discloses a polycarboxylic acid water reducing agent prepared from poly(ethylene glycol) ethyl ether, and a preparation method and a using method for the polycarboxylic acid water reducing agent, and belongs to the technical field of building materials. The polycarboxylic acid water reducing agent is prepared from the following raw materials in part by weight: 100 parts of poly(ethylene glycol) ethyl ether, 7 to 28 parts of methacrylic acid, 6 to 30 parts of acrylic acid, 6 to 20 parts of sodium methylacrylsulfonate, 0.15 to 0.60 part of hydroquinone, 2 to 3 parts of p-toluenesulfonic acid, 2.35 to 3.15 parts of ammonium persulfate, 8 to 20 parts of sodium hydroxide and 200 to 820 parts of water. The ideal polycarboxylic acid water reducing agent, the preparation method and the using method have the advantages of high water reducing rate, simple production process, low production cost, high fluidity maintenance during construction, and high strength of materials after concrete solidification. The water reducing rate of concrete is 27-32 percent, 2 hour slump loss is 10-30mm, 28 days ratio of compressive strength is 120-135 percent, a production process is simplified, and production cost is reduced; and the polycarboxylic acid water reducing agent is suitable for building high-rise buildings, long-span bridges, offshore drilling platforms, tunnels and airports.

Description

technical field [0001] The invention relates to a polycarboxylate water-reducer using polyethylene glycol monoethyl ether as a raw material, a preparation method and a use method thereof; it belongs to the use of polymer materials as active components of mortar concrete and is applied to the technical field of building materials. Background technique [0002] Cement concrete is the building material with the largest amount of consumption. Cement concrete with high strength and good fluidity has always been desired by the people. Research has found that the strength of cement concrete is closely related to the amount of water added when mixing concrete. A large amount of water is important for improving flow. It is advantageous in performance and convenient for construction, but the strength of concrete will decrease significantly with the increase of water consumption. In order to solve this technical problem, various water reducer products have entered the market. [0003]...

AI Technical Summary

Problems solved by technology

[0005] Methacrylic acid / methyl acrylate polycarboxylate water reducer is produced by free radical polymerization of methacrylic acid MAA and methacrylic acid polyethylene glycol monomethyl ether esterified product MAA-MPEG, the main chain and branched chain Depending on the ester linkage, in the synthesis of this type of water reducer, the molar ratio of MAA to polyethylene glycol monomethyl ether MPEG varies within the range of 1.5 to 6:1, and the number of polyoxyethylene units in MPEG ranges from 5 to 130 During the reaction, a chain transfer agent is added to adjust the relative molecular weight of the polymer; the high price of methacrylic acid used in this type of process leads to an increase in the cost of polycarboxylate water reducers, lack of market competitiveness, and the process is more complicated , the esterification process is difficult to control, and the esterification product has a great influence on the polymerization reaction and the performance of the final product

[0006] The allyl ether polycarboxylate water reducer is prepared by copolymerization of raw materials such as APEG, maleic anhydride, and initiator, and there is an ether bond between the main chain and the branch chain as a connecting functional group; this type of process There is no need for two-step synthesis, and the price of raw materials is low, but the product performance is not as good as that of methacrylic acid / methyl acrylate polycarboxylate water reducer

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