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Chemistry and Industry of Forest Products ›› 2019, Vol. 39 ›› Issue (1): 46-52.doi: 10.3969/j.issn.0253-2417.2019.01.007

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Isocyanate Modified Bamboo Surface and Its Corrosion Resistance Property

He GAO,Yong SUN*(),Xing TANG,Xianhai ZENG,Lu LIN   

  1. Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass; Xiamen Key Laboratory of Clean and High-valued Utilization for Biomass; College of Energy, Xiamen University, Xiamen 361102, China
  • Received:2018-10-14 Online:2019-02-25 Published:2019-03-14
  • Contact: Yong SUN E-mail:sunyong@xmu.edu.cn
  • Supported by:


The process of enhancing the corrosion resistance of natural bamboo by modifying its surface with isocyanate was developed. The bamboo treated with hot water or alkali was modified with dicyclohexylmethane 4, 4′-diisocyanate(HMDI) and achieved the bamboo samples H-HMDI-bam and A-HMDI-bam, respectively. The investigation on corrosion resistance mechanism indicated that the number of hydroxyl groups on the surface of the modified bamboo was significantly reduced after modification, while the numbers of the carbonyl and amide groups increased. HMDI was successfully grafted onto the fiber surface and formed the flocculent encapsulation. The loadings were 6.342 mmol/cm2 for A-HMDI-bam and 4.080 mmol/cm2 for H-HMDI-bam, respectively. The hydrophobicity of the modified sample was significantly enhanced, especially for H-HMDI-bam, whose water absorption decreased from 68.7% (raw material) to 35.5%, and the pore size and pore volume decreased significantly to 33.48 nm and 0.039 0 cm3/g, respectively. The SEM images showed that the sample coated with HMDI was hardly corroded, corresponding to the grade of 0-1, which was similar to that of the sample treated by the traditional carbonization process in industry.

Key words: bamboo, modification, isocyanate, corrosion resistance

CLC Number: