Effect of cellulosic fillers addition on curing and adhesion strength of moisture-curing one-component polyurethane adhesives

被引：13

作者：

Bhagavathi, Lakshmana Rao ^{[1
,4
]}

Deshpande, Abhijit P. ^{[2
]}

Ram, G. D. Janaki ^{[3
]}

Panigrahi, S. K. ^{[1
]}

机构：

[1] Indian Inst Technol Madras, Dept Mech Engn, Chennai 600036, Tamil Nadu, India

[2] Indian Inst Technol Madras, Dept Chem Engn, Chennai 600036, Tamil Nadu, India

[3] Indian Inst Technol Madras, Dept Met & Mat Engn, Chennai 600036, Tamil Nadu, India

[4] Rajiv Gandhi Univ Knowledge Technol Nuzvid, Dept Mech Engn, Nuzividu 521202, India

来源：

INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES | 2021年 / 108卷

关键词：

Polyurethane adhesives; Lap-shear strength; Curing; Infrared spectroscopy; Wood; Cellulose; MICROCRYSTALLINE CELLULOSE; LIGNIN; ROUGHNESS;

D O I：

10.1016/j.ijadhadh.2021.102871

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In this work, microcrystalline cellulose (MCC) and sawdust (SD) green fillers have been demonstrated as reactive fillers and moisture reservoirs for enhanced curing and adhesion strength of one-component moisture-curing polyurethane (PU) adhesives. The chemical reaction between the MCC or SD fillers and isocyanates present in the PU adhesives was tracked using Fourier-transform infrared spectroscopy (FTIR), while the joint strength was determined using lap-shear tests. The results showed that the addition of MCC or SD leads to an accelerated curing rate through the early consumption of isocyanates. The lap-shear strength of unreinforced PU adhesive joints was achieved in 12 hours. In turn, the curing time in MCC and SD reinforced joints was achieved in 5 hours. The addition of MCC and SD fillers also enhanced the lap-shear strength of the joints under full cure conditions. An autocatalytic growth model was used to describe the lap-shear strength variation with respect to curing time.

引用

页数：8

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