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AssigneeSouth China University of Technology
InventorsXueqing Qiu, Hongming Lou, Yuxia Pang, Dongjie Yang, Xinping Ouyang, Conghua Yi
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This invention discloses a high-performance lignin-based water reducer with high degree of sulfonation and high molecular weight and its preparation method. This water reducer exhibits an excellent water-reducing performance, its water-reducing rate of this lignin-based water reducer reaches 25% at a dosage of 0.70 wt %, which is higher than that of the naphthalene-based water reducer and the sulfonated lignin water reducer prepared by oxidation and sulfonation of alkali lignin, and 28-days compressive strength ratio of the concrete with this water reducer to the concrete without this water reducer is up to 150:100. Furthermore, the water reducer of present invention will not be crystallized in winter, and the concrete iron won't be corroded. The water reducer of the present invention makes the concretes having a low bleeding rate, excellent properties of workability, anti-freeze and anti-carbonization.
A process for preparing a lignin-based water reducer with high degree of sulfonation and high molecular weight consists of following steps:
A lignin-based water reducer is characterized in that average molecular weight of said water reducer being higher than 10000 daltons, sufonation degree of said water reducer being greater than 2.5 mmol/g, which is made from industrial lignin, dihydroxyketone and sulfonating agent.
Dependencies are inferred from the claim text.