The effect of free isocyanate content on properties of one component urethane adhesive

Poljanšek, Ida; Fabjan, Ema; Moderc, Darko; Kukanja, Dolores

doi:10.1016/j.ijadhadh.2014.02.012

Cited by 27 publications

(22 citation statements)

References 10 publications

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“…Although this kind of co-polymer system has shown very strong bonds, faster pressing time, and greater tolerance to higher moisture content than the traditional PF resins (Shafizadeh et al 1999), very few reports have discussed the characterization of their reaction mechanism. As the intermolecular interactions play a key role in polymer compatibility (Lenghaus et al 2000), different molecular weights of phenolic resins should display different properties when they react with the isocyanate group of isocyanate resin (Poljanšek et al 2014). The objective of this research is to explore the MDI/PF resin copolymer system, in which the impact of phenolic resin molecular weights on the properties of the system was also studied.…”

Section: Introductionmentioning

confidence: 99%

Developing a Renewable Hybrid Resin System. Part I: Characterization of Co-Polymers of Isocyanate with Different Molecular Weights of Phenolic Resins

Liu¹,

Shmulsky²,

Luo³

et al. 2016

BioResources

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Co-polymer systems of methylene diphenyl diisocyanate (MDI) and phenol-formaldehyde (PF) resins with different molecular weights were characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The FTIR and TGA coupled with differential thermogravimetric (DTG) results showed that higher molecular weight of PF resins not only promoted the reaction of isocyanate and PF co-polymer system, but also resulted in a better thermal property of prepared co-polymers. The XRD results revealed that higher molecular weight led to a higher proportion of ordered or crosslinking structures in the hybrid resin system. The relationship between the thermal resistance, mechanical properties and the molecular weights of phenolic resins needs further study.

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Section: Introductionmentioning

confidence: 99%

Developing a Renewable Hybrid Resin System. Part I: Characterization of Co-Polymers of Isocyanate with Different Molecular Weights of Phenolic Resins

Liu¹,

Shmulsky²,

Luo³

et al. 2016

BioResources

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show abstract

“…Furthermore, P6 and P7 used the same twill base fabric albeit different bending properties, which seems to be due to the difference in the NCO/OH ratio and manufacturing process [15][16][17][18][19][20][21] along with composition characteristics in the PU grain layer: P6 is the heaviest among artificial leathers; therefore, it is believed to have low flexibility.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Mechanical properties and preferences of natural and artificial leathers, and their classification with a focus on leather for bags

Roh

2020

Journal of Engineered Fibers and Fabrics

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In this study, the mechanical properties and preferences of natural and artificial leathers were analyzed. The leathers were classified based on mechanical properties affecting their preferences. The mechanical properties of the leathers were measured via the KES-FB system, and an expert survey was conducted to evaluate leather preference. Leathers possess different mechanical properties depending on the manufacturing process and structural characteristics. Furthermore, differences were observed in the mechanical properties of natural and artificial leather. The mechanical properties of the leathers were related to the preferences for hand and bags. Accordingly, the leather was classified into three clusters. The leathers that were preferred for hand were not preferred for bags, and those preferred for bags were not preferred for hand. Therefore, different development strategies are needed, depending on the type of leather. Natural leather for bags should be light and have good compression elasticity along with its existing mechanical properties, whereas artificial leather should be light and have improved tensile resilience.

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“…The oldest types of one-component PU adhesives were based upon di-or triisocyanates that cured by reacting with active hydrogens on the surface of the substrate or moisture present in the air or substrate. One-component reactive polyurethane adhesives are prepared by reaction between monomeric or polymeric isocyanates and polyols (10). These systems offer the advantage of being one-package systems.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Reactive Polyurethane Adhesives and Studying the Effect of Ketonic Resins

Köken

Aydın

2020

Journal of the Turkish Chemical Society Section A: Chemistry

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In this study, the effects of cyclohexanone formaldehyde ketonic resin (CFR) with different montmorillonite (MM) content (from 0,5 to 3 wt%) on the viscosity, initial adhesion strength, and temperature resistance of polyurethane one-component adhesives were investigated. In situ MM modified cyclohexanone formaldehyde resin (MM-CFR) was used as polyol into formulation with a specified weight ratio (rate of 10% by weight of polyether polyol). One-shot technique was used for synthesis. CFR with varying montmorillonite (MM) content were incorporated blank polyurethane was synthesized using polyether polyol and polymeric 4,4'-methylene diphenyl diisocyanate (p-MDI). In experimental studies, the ratio of the isocyanate groups (NCO) to the hydroxyl group (OH) was 4.84. Reaction completion was followed by FTIR spectroscopy. Chloroparaffin was used as a plasticizer to adjust the viscosity and to reduce the fragile structure of the product. The NCO % values of the synthesized adhesive PU were measured by titration. When TGA data were examined, it was found that the heat resistance of the product increased with the addition of CFR and MM-CFR. As a result, it has been determined that the adhesion properties and thermal resistance were improved with the use of ketonic resins in one component reactive adhesives.

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The effect of free isocyanate content on properties of one component urethane adhesive

Cited by 27 publications

References 10 publications

Developing a Renewable Hybrid Resin System. Part I: Characterization of Co-Polymers of Isocyanate with Different Molecular Weights of Phenolic Resins

Developing a Renewable Hybrid Resin System. Part I: Characterization of Co-Polymers of Isocyanate with Different Molecular Weights of Phenolic Resins

Mechanical properties and preferences of natural and artificial leathers, and their classification with a focus on leather for bags

Synthesis of Reactive Polyurethane Adhesives and Studying the Effect of Ketonic Resins

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