应用化学 ›› 2025, Vol. 42 ›› Issue (4): 499-510.DOI: 10.19894/j.issn.1000-0518.240305

• 研究论文 • 上一篇    下一篇

机械活化干法制备高效减水剂羧甲基-β-环糊精工艺及减水性能

杨家添1, 苗雨1, 韦梦婷1, 王宁1, 黎以起1, 陈渊1(), 覃峰2, 胡华宇3   

  1. 1.玉林师范学院化学与食品科学学院,广西农产资源化学与生物技术重点实验室,玉林 537000
    2.广西交通职业技术学院,南宁 530004
    3.广西大学化学化工学院,南宁 530004
  • 收稿日期:2024-09-26 接受日期:2025-03-21 出版日期:2025-04-01 发布日期:2025-05-14
  • 通讯作者: 陈渊
  • 作者简介:chenyuan197191@163.com
  • 基金资助:
    国家自然科学基金(22268005);广西科学研究与技术开发计划项目(No.桂科AB18050004)和国家级大学生创新创业训练计划项目(202310606025)

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)

摘要:

为了优化羧甲基β-环糊精(CM-β-CD)制备工艺、利于工业化生产,以β-环糊精(β-CD)和氯乙酸钠(C2H2ClNaO2)为原料,采用机械活化干法制备CM-β-CD。 优化了CM-β-CD的工艺条件、表征了CM-β-CD的结构和测定了CM-β-CD的减水性能。 最佳工艺条件为: n(C2H2ClNaO2)∶nβ-CD)为4∶1、NaOH质量分数20%、球磨温度40 ℃和球磨时间3 h时,此条件下制备得到的CM-β-CD的取代度(DS)为0.72,水泥净浆流动度达到237 mm(添加质量分数0.8%的CM-β-CD)。 与普通干法制备的CM-β-CD相比,机械活化干法制备CM-β-CD的减水性能更优越。 添加CM-β-CD质量分数为0.8%时,水泥砂浆减水率为20.40%,水泥养护时间28 d时的抗压抗折强度达到60.50和7.98 MPa。 CM-β-CD是一种具有应用前景的绿色性能混凝土减水剂。

关键词: 羧甲基β-环糊精, 机械活化干法, 取代度, 水泥净浆流动度, 高效减水剂

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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