Oligomer surfactant, and preparation method and application thereof

Abstract

The invention provides an oligomer surfactant, and a preparation method and application thereof. The oligomer surfactant has high surface activity, and excellent foaming and foam stabilizing properties. The oligomer surfactant has a specific structure: the molecule contains 3-7 hydrophobic chain segments and hydrophilic units, wherein each hydrophobic chain segment is a C8-C18 alkyl chain, and each hydrophilic unit is composed of 0-3 epoxy units and sulfate groups which are connected in the position near the hydrophilic unit through chemical bond covalence. The preparation method comprises the following steps: carrying out reaction on an alkyl epoxy compound B and a polylol A to generate an intermediate C, and sequentially modifying the hydrophilic epoxy units and sulfate groups on the intermediate C, thereby obtaining the oligomer surfactant. The oligomer surfactant has excellent air-entraining and foam stabilizing property when being used as a concrete air entraining agent; and meanwhile, the hardened concrete has excellent aerated structure and can not generate great impact on the setting strength of the concrete.

Description

technical field [0001] The invention relates to an oligomeric surfactant, its preparation method and application, and belongs to the field of concrete admixtures. Background technique [0002] In recent years, with the development of high-performance concrete, people have paid more and more attention to the durability of concrete. The research and development and production of air-entraining agents have gradually become a hot spot in the field of admixtures. In the process of concrete mixing, adding air-entraining agent can introduce appropriate amount of tiny, uniform and airtight air bubbles into freshly mixed and hardened concrete, thereby improving the durability and anti-thawing performance of concrete. Currently commonly used air-entraining agents include rosin air-entraining agents, saponin air-entraining agents, alkyl sulfonate air-entraining agents, etc. From their chemical structure, they are a kind of surfactant, that is, amphiphilic single-chain molecules with a...

AI Technical Summary

Problems solved by technology

At present, the research on oligomeric surfactants is still in its infancy, mainly including trimer, tetramer, hexameric, etc.; there are few

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