Leather Science and Engineering ›› 2024, Vol. 34 ›› Issue (2): 14-21.doi: 10.19677/j.issn.1004-7964.2024.02.003

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Study on the Preparation and Performance of Microemulsion Leather Degreasing Agent

LV Bin1,2,3, ZHANG Lingyu1,2,3, SHI Chuanjin4, GAO Dangge1,2,3,*, MA Jianzhong1,2,3   

  1. 1. School of Light Industry Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China;
    2. Xi'an Key Laboratory of Green Chemicals and Functional Materials, Xi'an 710021, China;
    3. National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an 710021, China;
    4. China Leather and Shoe Industry Research Institute (Jinjiang) Co., LTD., Jinjiang 362200, China
  • Received:2023-08-31 Revised:2023-11-05 Accepted:2023-11-13 Published:2024-04-01 Online:2024-03-07

Abstract: The effects of microemulsion’s main surfactant type and ratio, co-surfactant type, the ratio of main surfactant to co-surfactant, and the ratio of main surfactant to D-limonene on the area of pseudo-three-phase diagrams were investigated. The optimal preparation process of microemulsion was obtained by optimizing the amount of NaCl in the aqueous phase by salinity scanning. The structural properties of microemulsion were characterized by dynamic light scattering and electrical conductivity. Results showed that the bicontinuous microemulsion with the largest microemulsion area was obtained when the conditions were as follow: fatty alcohol polyoxyethylene ether, sodium dodecyl sulfate and isomeric alcohol ether were used as the main surfactants and their mass ratio was 1∶1∶1; n-butanol was the co-surfactant and the ratio of the main surfactants to the co-surfactant was 2∶1; the mass ratio of the main surfactants to D-limonene was 2∶1, and the aqueous solution with the dosage of NaCl of 4.8% served as the aqueous phase. The microemulsion’s particle size was 51.8 nm and its polydispersity index was 0.274, indicating the smaller particle size and better dispersion. The microemulsion’s surface tension was 27.3 mN/m and its interfacial tension was 0.09 mN/m, and its emulsification, wettability and stability performance were excellent. For the fatty pickled sheep skin, the degreasing rate of the microemulsion leather degreasing agent was higher than that of the commercially available leather degreasing agent.

Key words: microemulsion, leather, degreasing agent, surfactant

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