A Room‐Temperature Curing Plant Protein‐Based Adhesive with High Strength and Flame Retardancy for Heat‐Free Adhesion

Plant protein‐based adhesives are gaining traction owing to their low cost and eco‐friendliness. However, achieving flame retardancy and long‐term water resistance in them under room‐temperature curing conditions remains a challenge due to the hydrophilicity and low reactivity of plant proteins. Her...

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Veröffentlicht in:Advanced functional materials 2024-09, Vol.34 (39), p.n/a
Hauptverfasser: Jiang, Ke, Dong, Xuemei, Chen, Yuan, Fan, Dongbin, Chu, Fuxiang
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creator Jiang, Ke
Dong, Xuemei
Chen, Yuan
Fan, Dongbin
Chu, Fuxiang
description Plant protein‐based adhesives are gaining traction owing to their low cost and eco‐friendliness. However, achieving flame retardancy and long‐term water resistance in them under room‐temperature curing conditions remains a challenge due to the hydrophilicity and low reactivity of plant proteins. Herein, a novel adhesive synthesized from soybean meal (SM), activated sodium alginate (aSA), nano‐hydroxyapatite (nHA), and polyamidoamine‐epichlorohydrin (PAE) resin addresses this challenge. aSA as a reactive bio‐based cross‐linker formed covalent cross‐linking structures with SM matrix at room temperature, while the nHA‐induced biomineralization and PAE‐constructed supramolecular cross‐linking promote water drainage from the adhesive, preventing water erosion of the adhesive structure. The developed adhesive shows versatility across multiple substrates, with its wet shear strength on wood reaching 0.76 MPa, surpassing that of the commercial aldehyde‐based adhesive. The adhesive is effective over a wide temperature range from room temperature to 150 °C due to the reactivity of the PAE resin above 60 °C. Moreover, it exhibits excellent flame retardancy (limiting oxygen index of 31.2%) owing to its dense structure and the abundance of N‐containing and P‐containing components. This work is expected to break the monopoly of petroleum‐based adhesives in the realm of room‐temperature adhesives. A plant protein‐based adhesive with high strength under room temperature curing conditions is achieved by N‐hydroxysuccinimide ester grafting, biomineralization, and supramolecular cross‐linking. The adhesive exhibits universal adhesion across various substrates, and its adhesion shear strength on wood remains 0.76 MPa after 3 h of soaking in water at 63 °C. The limiting oxygen index of the adhesive reaches 31.2%.
doi_str_mv 10.1002/adfm.202403490
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subjects Adhesive strength
Adhesives
Aldehydes
bio‐based adhesives
Curing
Epichlorohydrin
Fire resistance
flame retardancy
Hydroxyapatite
plant proteins
Proteins
Resins
Room temperature
room‐temperature curing
Shear strength
Sodium alginate
Substrates
Water erosion
Water resistance
title A Room‐Temperature Curing Plant Protein‐Based Adhesive with High Strength and Flame Retardancy for Heat‐Free Adhesion
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