Facile fabrication of pressure-sensitive adhesives

A recent work features the facile preparation of epoxidised soybean oil-hexanediamine resin for fabrication of pressure-sensitive adhesives.

Pressure-sensitive adhesives (PSA) have the advantages of low cost, safe use, short polymerisation time and good adhesion. Image source: makuba – Fotolia.com (symbol image).

Due to the massive consumption of petroleum-derived resources, it is imperative to develop biomass adhesives to replace traditional petroleum-derived materials. A new work deals with the possibility to undergo crosslinking of epoxidised soybean oil (ESO) using hexanediamine (HDA) via one-pot method to produce a pressure-sensitive adhesive, poly(epoxidized soybean oil)-hexanediamine (PESH). Test results revealed that the initial viscosity, adhesion persistence and peeling were significantly improved when the molar ratio of ESO to HDA was 1:3.

Good application prospects

At the same time, the PESH adhesive exhibited good bonding performance under water, especially with PVC substrates, in which the underwater bonding strength can reach 1043 KPa. In addition, PESH adhesive with high crosslinking degree presented excellent resistivity at high voltage. It can be implied that the addition of HDA can acquire the PSA antifungal action. All the results support that at a molar ratio of ESO to HDA of 1:3, it is easier to produce robust crosslinked network structure with overall upgraded properties. Conclusively, the developed PESH adhesive can provide a good application prospect in packaging and insulating fields.

The study has been published in Progress in Organic Coatings, Volume 182, September 2023.

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