Preparation method and application of lauramide concrete foaming agent

Abstract

The invention discloses a preparation method and an application of a lauramide concrete foaming agent. The method is characterized in that: lauric acid and hydroxyethylethylene diamine with a molar ratio of 1.0:1.0-1.5 are added into a reaction vessel, a solvent toluene is added, and the mixture is subject to a reaction for 2 to 5 hours under a temperature of 140 to 160 DEG C; the mixture is cooled, and a crude product of a yellow solid is obtained; the crude product is washed by using anhydrous acetone, and is dried, such that a white powdery solid is obtained, wherein the solid is an intermediate; the intermediate, chloroacetic acid and sodium hydroxide are formulated according to a molar ratio of 1:1.0-1.3:2.0-2.6; chloroacetic acid and sodium hydroxide are dissolved in water, such that a sodium monochloroacetate solution with a mass percent concentration of 10 to 20% is prepared; the intermediate is heated to 80 to 90 DEG C until melted, the sodium monochloroacetate solution is dropped into the intermediate, and the mixture is then subject to a reaction for 3 to 5 hours with maintained temperature; the mixture is cooled and filtered, insoluble substances are discarded, and the filtrate is the lauramide concrete foaming agent with excellent foaming performance.

Description

technical field [0001] The invention belongs to the preparation method of concrete foaming agent and its application research category, relates to a preparation method and application of a laurylamide concrete foaming agent, and is mainly suitable for the manufacture of foamed concrete. Background technique [0002] In the prior art, commonly used concrete foaming agents mainly include: rosin resins, synthetics, proteins, composites, etc., the main components of which are one or more surfactants. Rosin resin concrete foaming agent can only be used for density greater than 600kg / m2 because of its unsatisfactory foam stability and expansion ratio. 3 The above medium and high density foam concrete cannot be used for 500kg / m 3 The following low-density foamed concrete; although synthetic concrete foaming agent foams quickly and has a high foaming ratio, its foam stability is poor, and it is not suitable for the preparation of low-density foamed concrete; although animal protein...

AI Technical Summary

Problems solved by technology

Rosin resin concrete foaming agent can only be used for density greater than 600kg / m2 because of its unsatisfactory foam stability and expansion ratio. 3 The above medium and high density foam concrete cannot be used for 500kg / m 3 The following low-density foamed concrete; although synthetic concrete foaming agent foams quickly and has a high foaming ratio, its foam stability is poor, and it is not suitable for the preparation of low-density foamed concrete; although animal protein concrete foaming agent foams High foaming ratio and good foam stability can be used in the preparation of low-density foam concrete, but the raw materials required for its preparation, such as animal hair, animal hoof horns, etc., have limited sources, and the animal protein concrete foaming agent has a strong odor during production and use , there are also disadvantages such as retardation, sensitivity to ambient temperature and humidity, and high cost of use, which limit its wide application; although plant protein concrete foaming agent is environmentally friendly and has low cost of use, its foam stability is poor , is not suitable for the production of low density foam concrete

At present, commercially available concrete foaming agents still have short foam stability time, especially when they are added to the mixture, the bubbles burst quickly, which leads to application defects such as early collapse of the mixture, so the development of high-quality low-volume-density foam concrete The preparation of foaming agent or its composite components has great practical significance

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