Characterization of the ageing process of one-component polyurethane moisture curing wood adhesive

Clerc, Gaspard; Brülisauer, Martina; Affolter, Samuel; Volkmer, Thomas; Pichelin, Frédéric; Niemz, Peter

doi:10.1016/j.ijadhadh.2016.09.008

Cited by 36 publications

(11 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…13 Non-isocyanate poly(ester urethane) synthesis [214] Additionally, the performance of an adhesive is not only determined by its properties, such as rheological behaviour or surface free energy, but also by the adhesion surface characteristics (pH, functional groups, roughness, presence of debris or extractives) and curing conditions (temperature, humidity, etc.). As a consequence, some investigations have revealed the relevant influence of parameters such as the relative humidity [217], artificial aging [218] and substrate modifications to improve the adhesive wettability [219] on the ultimate properties developed by the adhesive joints.…”

Section: Fundamentals and General Conceptsmentioning

confidence: 99%

A Review of the Sustainable Approaches in the Production of Bio-based Polyurethanes and Their Applications in the Adhesive Field

2020

View full text Add to dashboard Cite

On account of the irreversible environmental damage caused by the utilization of non-renewable raw materials in industrial production, since the end of the twentieth century, the interest in replacing the traditionally applied petroleum-based starting compounds in the polyurethane production by more sustainable feedstocks has grown enormously. Such pursuit of Green Chemistry has been fostered by the implementation of a set of national and international initiatives and stricter regulations, especially in the field of adhesives. In this respect, the latest advances in the production of bio-based polyurethanes are collected in this review. Thus, after a brief introduction to this subject and main tendencies towards the production of more sustainable polyurethanes, the first section reviews the feasibility of manufacturing polyurethanes from a range of natural platforms, including lignocellulosic biomass and vegetable oils, whether modified or in their original form, along with some industrial wastes. Afterwards, the hitherto considered synthetic routes for the preparation of greener polyurethanes are assessed, encompassing waterborne, radiation-curable and non-isocyanate polyurethane techniques. Finally, the last section focuses on the research advancement on the synthesis, properties and different uses of bio-based polyurethanes specifically implemented in the field of adhesives.

show abstract

Section: Fundamentals and General Conceptsmentioning

confidence: 99%

A Review of the Sustainable Approaches in the Production of Bio-based Polyurethanes and Their Applications in the Adhesive Field

2020

View full text Add to dashboard Cite

show abstract

“…It can be said that this was due to the structural properties of the different chemicals used in the 3 layer and 5 layer applications and the resin used in its production. It was reported by Clerc et al (2017) that the loss of adhesion strength due to weather conditions is often due to wood deterioration rather than the chemical degradation of the adhesive. The colour changes (ΔL*, Δa*, Δb*, and ΔE*) are presented in Table 4.…”

Section: Resultsmentioning

confidence: 99%

Effects of artificial weathering on the color, gloss, adhesion, and pendulum hardness of UV system parquet varnish applied to doussie (Afzelia africana) wood

Gürleyen¹

2021

BioRes

View full text Add to dashboard Cite

An important wood species in the furniture and parquet industry today is “doussie” wood. In this study, the effects of artificial weathering on ultraviolet-cured varnish (3 coats and 5 coats) applied to doussie (Afzelia africana) wood were investigated. The samples of the UV system cured varnishes were exposed to aging effects for 252 h and 504 h via an UV-A 340 nm lamp. The coated specimens were exposed to UV-A 340 nm fluorescent lamp in a QUV accelerated weathering tester for 252 h and 504 h. The surface adhesion strength, color (L*, a*, b*, ∆E*, ∆L*, ∆a*, and ∆b*) parameters, pendulum hardness, and glossiness (parallel (//) and perpendicular (⊥) at 20°, 60°, and 85°) of UV varnishes coated samples were quantified before and after weathering. According to the results, while the a* value increased, the adhesion, L*, b*, and glossiness values decreased with aging. As a result, it was concluded that doussie wood can be used in the production of flooring with UV-cured varnish.

show abstract

“…A protocol for the preparation of relevant calculations was reported by Hering (2011). Although it is important to properly understand the aging mechanism, the long-term performance of gluelaminated timber products has not been sufficiently researched (Hering 2011, Niemz 2016, Clerc et al 2017, Clerc et al 2020a, 2020b, Huč et al 2020. The numerous laboratory tests conducted provided adequate reference data corresponding to reasonable exposure times covering multiple years of service.…”

Section: Influence Of Mechanical Loads and The Surrounding Climatementioning

confidence: 99%

Selected previous findings on the factors influencing the gluing quality of solid wood products in timber construction and possible developments: A review

Hänsel¹,

Sandak

et al. 2021

Wood Material Science & Engineering

Self Cite

View full text Add to dashboard Cite

Various factors affect the bonding quality of elements used for timber construction. This review includes literature studies and personal experiences related to relevant technological variables defining glue bond performance in glue-laminated timber elements during their service life. The gluing of hardwood species receives special focus as it is considered by the industry to be the most challenging process for implementation. In particular, the effects of wood species, type of adhesive, glued-wood surface quality, physical and/or chemical modification of the wood, technological solutions for gluing, and varying climatic conditions during the use phase (relative humidity, temperature, air circulation, etc.) are considered. In addition, overlapping of individual influencing factors often leads to problems with bonding, thus requiring strongly integrating measurement methods (e.g. NIR spectroscopy). The causes of variations in the results when glued wood is tested using different standardized methods are discussed. A list of open research questions is provided, and problem solutions are recommended based on systematized cuttingedge knowledge. The aim of the work is to systematize the state of knowledge of wood gluing to create a basis for controlled and stable manufacturing processes. The progress of the work will be reported in further publications.

show abstract

Characterization of the ageing process of one-component polyurethane moisture curing wood adhesive

Cited by 36 publications

References 7 publications

A Review of the Sustainable Approaches in the Production of Bio-based Polyurethanes and Their Applications in the Adhesive Field

A Review of the Sustainable Approaches in the Production of Bio-based Polyurethanes and Their Applications in the Adhesive Field

Effects of artificial weathering on the color, gloss, adhesion, and pendulum hardness of UV system parquet varnish applied to doussie (Afzelia africana) wood

Selected previous findings on the factors influencing the gluing quality of solid wood products in timber construction and possible developments: A review

Contact Info

Product

Resources

About