A kind of retarding type high-efficiency dispersant and preparation method thereof

Abstract

The invention discloses a set-retarding type efficient dispersant. The set-retarding type efficient dispersant is characterized in that a melamine derivative serves as a core, -PO3H2 and polyoxyalkylene side chains serve as the periphery and are independent from each other, but the periphery cannot be -PO3H2 or the polyoxyalkylene side chains completely simultaneously; the weight-average molecular weight of every polyoxyalkylene side chain ranges from 1,000 to 3,000, one terminal of every polyoxyalkylene side chain is exposed-OH while the other terminal thereof is unexposed fatty group or aromatic group, and every polyoxyalkylene side chain is prepared by direct oxyalkylation of corresponding fatty alcohol or aromatic alcohol. The set-retarding type efficient dispersant has a certain water reducing and slump retaining performance and remarkable set-retarding effect, and is highly adaptable to current low-grade concrete raw materials, strong in market demand, advanced in preparation technology and low in cost, thereby being promising in prospect and hopefully being developed into core technology of the concrete water reducing agent field to lead industry development.

Description

technical field [0001] The invention belongs to the field of chemical building materials, and in particular relates to a retarding type high-efficiency dispersant for medium and low slump concrete and a preparation method thereof. Background technique [0002] Concrete admixture refers to the substance added to improve and adjust the performance of concrete. It can regulate the rheological properties of concrete, improve mechanical properties and improve durability. Concrete admixture technology has become the core technology of modern concrete. In view of the requirements of high strength, low shrinkage, and long construction period for large-volume concrete such as nuclear power projects and hydraulic engineering, it is important to develop concrete admixtures with retarding type, low and medium water reducing rate, and long-term slump retention (2-8h). meaning. [0003] At present, no special concrete admixture for large-volume special concrete has been found. Through a ...

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Problems solved by technology

[0011] In order to solve the complex preparation process of the retarder, the retarder does not have the water reducing effect, and the high-efficiency superplasticizer is not strong in adaptability. Solve the cracking problem of large-volume concrete; the present invention aims at the application performance index of large-volume concrete, and develops a kind of retarding high-efficiency dispersant with high water-reducing rate, excellent retardation and long slump retention time (2-8h) and its preparation method, the retarding high-efficiency dispersant has good cement adaptability, low clay and sulfate sensitivity, can be used in combination with other water reducing agents, the preparation process can be industrialized, and has broad application prospects

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