异氰酸酯改性竹材表面及其抗蚀性能研究

doi:10.3969/j.issn.0253-2417.2019.01.007

Abstract

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

CLC Number:

TQ35

He GAO,Yong SUN,Xing TANG,Xianhai ZENG,Lu LIN. Isocyanate Modified Bamboo Surface and Its Corrosion Resistance Property[J]. Chemistry and Industry of Forest Products, 2019, 39(1): 46-52.

Figures/Tables 8

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References 17

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样品编号¹⁾ samples code	N/%	C/%	HMDI/%	HMDI负载量/(mmol·cm^-2) HMDI loading
bam	0.122	43.788
A-bam	0.130	44.472
H-bam	0.117	45.671
C-bam	0.043	61.074
A-HMDI-bam	0.904	44.473	7.252	6.342
H-HMDI-bam	0.717	45.794	5.622	4.080

样品 samples	比表面积/(m²·g^-1) surface area	孔体积/(cm³·g^-1) pore volume	孔径/nm pore size
bam	1.592	0.0636	65.98
A-bam	2.163	0.0603	50.32
H-bam	2.423	0.0572	37.84
A-HMDI-bam	5.710	0.0426	42.71
H-HMDI-bam	4.227	0.0390	33.48
C-bam	2.324	0.0536	17.16

样品 samples	干质量/g dry weight	湿质量/g wet weight	吸水率/% water absorption	腐蚀等级¹⁾ corrosion degree	表面霉菌斑点程度 mold area on surface
bam	1.47	2.48	68.7	4	>60%
H-bam	1.22	1.96	60.6	3	30%~60%
A-bam	1.19	2.09	75.6	4	>60%
H-HMDI-bam	1.07	1.45	35.5	0~1	~0
A-HMDI-bam	1.29	1.83	41.9	1	~10%
C-bam	1.16	1.46	25.9	0	0

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Isocyanate Modified Bamboo Surface and Its Corrosion Resistance Property

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