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林产化学与工业 ›› 2019, Vol. 39 ›› Issue (1): 46-52.doi: 10.3969/j.issn.0253-2417.2019.01.007

• 研究报告 • 上一篇    下一篇

异氰酸酯改性竹材表面及其抗蚀性能研究

高和,孙勇*(),唐兴,曾宪海,林鹿   

  1. 厦门大学 能源学院;福建省生物质清洁高值化技术工程研究中心;厦门市 生物质清洁高值化利用重点实验室,福建 厦门 361102
  • 收稿日期:2018-10-14 出版日期:2019-02-25 发布日期:2019-03-14
  • 通讯作者: 孙勇 E-mail:sunyong@xmu.edu.cn
  • 作者简介:高和(1994—),男,江西九江人,硕士生,研究方向为能源化工
  • 基金资助:
    国家自然科学基金资助项目(21776234);中国石油天然气集团有限公司创新基金(2018D-5007-0503)

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:
    国家自然科学基金资助项目(21776234);中国石油天然气集团有限公司创新基金(2018D-5007-0503)

摘要:

以异氰酸酯对竹材表面进行接枝改性,大幅提升了天然竹材的抗蚀性能。研究中分别以热水预处理竹材(H-bam)和碱预处理竹材(A-bam)为原料,采用二环己甲烷4, 4′-二异氰酸酯(HMDI)为改性剂,得到改性竹材样品H-HMDI-bam和A-HMDI-bam。抗蚀机制研究表明:改性后竹材表面的羟基数量明显减少,羰基、酰胺官能团增加,HMDI成功接枝到纤维表面并成絮状包裹状,A-HMDI-bam和H-HMDI-bam的负载量分别为6.342和4.080 mmol/cm2。改性样品疏水性明显增强,其中H-HMDI-bam表现优异,吸水率由原料的68.7%下降到35.5%,孔径和孔体积大幅下降到33.48 nm和0.039 0 cm3/g。SEM观察表明H-HMDI-bam样品无明显被腐蚀的痕迹,腐蚀等级为0~1级,与工业传统炭化抗腐处理工艺水平相当。

关键词: 竹材, 改性, 异氰酸酯, 耐蚀性

Abstract:

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

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