Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (4): 499-510.DOI: 10.19894/j.issn.1000-0518.240305

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Preparation Process and Water-Reducing Performance of Carboxymethyl- β -Cyclodextrin by Mechanically Activated Dry Method

Jia-Tian YANG1, Yu MIAO1, Meng-Ting WEI1, Ning WANG1, Yi-Qi LI1, Yuan CHEN1(), Feng QIN2, Hua-Yu HU3   

  1. 1.Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology,College of Chemistry and Food Science,Yulin Normal University,Yulin 537000,China
    2.Guangxi Vocational and Technical College of Communications,Nanning 530004,China
    3.School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China
  • Received:2024-09-26 Accepted:2025-03-21 Published:2025-04-01 Online:2025-05-14
  • Contact: Yuan CHEN
  • Supported by:
    the National Natural Science Foundation of China(22268005);Guangxi Science and Technology Plan Project, China(GuikeAB18050004);the National Undergraduate Training Program for Innovation and Program(202310606025)

Abstract:

To simplify the preparation process, and facilitate industrial-scale production, carboxymethyl-β-cyclodextrin (CM-β-CD) was prepared via a mechanically activated dry method using β-cyclodextrin (β-CD) and sodium chloroacetate as the raw material. The preparation process was optimized, the structure of CM-β-CD was characterized, and its water-reducing performance was evaluated. The optimal conditions were as follows: the n(C2H2ClNaO2)∶nβ-CD) was 4∶1, the mass fraction of NaOH was 20%, the ball milling temperature was 40 ℃, and the ball milling time was 3 h. Under these conditions, the degree of substitution of CM-β-CD reached 0.72, and the fluidity of the cement paste achieved 237 mm with an addition of the mass fraction of 0.8% CM-β-CD. Compared to CM-β-CD prepared by conventional dry methods, CM-β-CD prepared by the mechanically activated dry method showed superior water-reducing performance. When the mass fraction of CM-β-CD was 0.8%, the water reduction rate in cement mortar was 20.40%, and the compressive and flexural strengths after 28 d of curing were 60.50 and 7.98 MPa, respectively. CM-β-CD is a promising green water-reducing agent for high-performance concrete.

Key words: CM-β-CD, Mechanically activated dry method, Degree of substitution, Fluidity of cement paste, High-performance water-reducing agent

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