Preparation and Characterization of Soybean Protein Adhesives Modified with an Environmental-Friendly Tannin-Based Resin

Author:

Li Hanyin1,Wang Yujie1,Xie Wenwen1,Tang Yang1,Yang Fan1,Gong Chenrui1,Wang Chao12,Li Xiaona3ORCID,Li Cheng1

Affiliation:

1. College of Forestry, Henan Agricultural University, Zhengzhou 450002, China

2. College of Landscape Architecture and Art, Henan Agricultural University, Zhengzhou 450002, China

3. College of Material Science and Engineering, Nanjing Forestry University, Longpan Road 159, Xuanwu District, Nanjing 210037, China

Abstract

Soybean protein-based adhesives are limited in their application due to their poor wet bonding strength and poor water resistance. Herein, we prepared a novel, environmentally friendly soybean protein-based adhesive by adding tannin-based resin (TR) to improve the performance of water resistance and wet bonding strength. The active sites of TR reacted with the soybean protein and its functional groups and formed strong cross-linked network structures, which improved the cross-link density of the adhesives and then improved the water resistance. The residual rate increased to 81.06% when 20 wt%TR was added, and the water resistance bonding strength reached 1.07 MPa, which fully met the Chinese national requirements for plywood (Class II, ≥0.7 MPa). SEM observations were performed on the fracture surfaces of all modified SPI adhesives after curing. The modified adhesive has a denser and smooth cross-section. Based on the TG and DTG plots, the thermal stability performance of the TR-modified SPI adhesive was improved when TR was added. The total weight loss of the adhesive decreased from 65.13% to 58.87%. This study provides a method for preparing low-cost and high-performance, environmentally friendly adhesives.

Funder

the Special Fund for Young Talents in Henan Agricultural University

Publisher

MDPI AG

Subject

Polymers and Plastics,General Chemistry

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