Research summary: Analysis of selected adhesive systems intended for façade bonding

Nečasová, Barbora; Liška, Pavel; Šlanhof, Jiří

doi:10.1201/9781315393827-98

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…Unfortunately, the bonding of WPCs is more complicated than the bonding of traditional materials [2,4,18]. This statement was also confirmed by authors in previous research, where the adhesive properties of solid timber, cement-bonded particle board and WPC were studied [25]. The bondability of WPCs is highly affected by the thermoplastic component of the product, i.e., its thermoplastic matrix, which has a very low surface energy and bad wettability properties [1,2,11,26,27].…”

Section: Introductionsupporting

confidence: 57%

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Comparison of Adhesive Properties of Polyurethane Adhesive System and Wood-plastic Composites with Different Polymers after Mechanical, Chemical and Physical Surface Treatment

et al. 2019

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The cost of most primary materials is increasing, therefore, finding innovative solutions for the re-use of residual waste has become a topic discussed more intensely in recent years. WPCs certainly meet some of these demands. The presented study is focused on an experimental analysis of the effect of surface treatment on the adhesive properties of selected WPCs. Bonding of polymer-based materials is a rather complicated phenomenon and modification of the bonded area in order to improve the adhesive properties is required. Two traditional types of surface treatments and one entirely new approach have been used: mechanical with sandpaper, chemical with 10 wt % NaOH solution and physical modification of the surface by means of a MHSDBD plasma source. For comparison purposes, two high-density polyethylene based products and one polyvinyl-chloride based product with different component ratios were tested. A bonded joint was made using a moisture-curing permanently elastic one-component polyurethane pre-polymer adhesive. Standardized tensile and shear test methods were performed after surface treatment. All tested surface treatments resulted in an improvement of adhesive properties and an increase in bond strength, however, the MHSDBD plasma treatment was proven to be a more suitable surface modification for all selected WPCs.

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Section: Introductionsupporting

confidence: 57%

“…This modification regularly shows very good wetting results and strength increases. The sandpaper coarseness was determined based on previous experience modifying cement-based composites and WPC [25,29,30]. P80 and P240 sandpaper was used in previous research cases, both types are less abrasive and leaves a finer surface.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Adhesive Properties of Polyurethane Adhesive System and Wood-plastic Composites with Different Polymers after Mechanical, Chemical and Physical Surface Treatment

et al. 2019

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“…A pressure load of 3.0 kPa (≈300 kg/m 2 ) was determined based on the results of laboratory tests performed on specimens of smaller sizes. 30 A permanent deformation of approximately 1.0 mm was expected at this pressure load level. From this load level, the façade segments were loaded gradually until the breaking.…”

Section: Methodsmentioning

confidence: 78%

“…It does not require any additional surface treatment or the application of a protective coating on the front side, and at the same time the authors had already proved that it is a material suitable for bonding and is compatible with selected adhesive systems. 30,31 The cladding is produced from the following: 63 wt% of wood chips, 25 wt% of Portland cement, 10 wt% of water and 2 wt% of additives promoting hydration (the manufacturer has not provided a detailed description of the additives). This type of particleboard is produced in the basic size of 1.25 × 3.35 m, which was adjusted to the size of the test specimen, 1.10 × 1.85 m. For façade cladding it is suitable to use particleboard with a thickness of 10–12 mm, the first variant with 10 mm being used in the presented case.…”

Section: Methodsmentioning

confidence: 99%

Long adhesive joints in façade applications exposed to wind suction

Nečasová

Liška

Šlanhof

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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This paper provides an insight into the investigation of long thick-layer adhesive façade joint resistance to negative pressure loads, i.e. wind suction. The real structural response to wind actions was simulated with reference to ETAG 034. Each specimen represented a reference façade section. The experiment focused on four different adhesive systems with flexible high strength 1-K polyurethanes and 1-K modified silyl polymers. Several variants of the test assemblies were tested: 1) a test assembly with an adhesive joint when a) the manufacturers’ application instructions for the system were followed and b) the instructions were violated; 2) a test assembly with a mechanical joint. These variants made it possible to compare the properties of both fastening methods, and moreover, to assess the impact of the mounting tape on the properties of the adhesive joint. The comparison of adhesive joints and a mechanical joint proved the greater structural stiffness and stress resistance of bonded assemblies. Monitoring showed that a local failure of the fastening element between the load-bearing frame and supporting structure caused the failure of the bonded assemblies, whereas the specimen with mechanically attached cladding failed due to pull-through of the fasteners. The average failure load of the bonded assembly was 10.88 kPa. In contrast, the failure load of the segment with mechanical fasteners was 10.12 kPa. Even though the difference in maximum pressure loads was only around 7%, the recorded values clearly demonstrate that the weakest part of the whole façade system is the mechanical joint, not the bonded one. Furthermore, the comparison of the results for segments with and without mounting tape showed that tape can have a major impact on the bond strength, since in case of the test specimens without mounting tape, the recorded failure load was a maximum of 30% higher.

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“…The objectives of this work are based on the results of already completed research which studied the bondability of a group of selected adhesives and cladding materials [3]. The results showed that adhesive properties of solid wood are ideal, no matter if the used adhesive system is intended for bonding of wood or not.…”

Section: Introductionmentioning

confidence: 99%

Study on Surface Treatments of Modified Wood Plastic Composite (WPC) to Improve Adhesion

Nečasová

Liška

Kelar

2016

AMM

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The presented case study is focused on the complications that affect the adhesion properties of wood plastic composites. In an effort to improve the physical properties of the WPC and the adhesive bonding between the selected material and adhesive systems intended for façade bonding, several surface pretreatments were performed. The surface modification consisted of mechanical roughening or physical treatment with diffuse coplanar surface barrier discharge. The shear strength of the adhesive bond was tested following ČSN EN 1465 and the maximum shear stress was calculated for each treatment method. Although, the increase in bond strength due to these treatments was measured only for one tested adhesive system where the strength was increased by 100% with respect to the control, the diffuse plasma treatment improved the adhesive bondability and a change in failure mode was observed in all tested cases.

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Research summary: Analysis of selected adhesive systems intended for façade bonding

Cited by 3 publications

References 4 publications

Comparison of Adhesive Properties of Polyurethane Adhesive System and Wood-plastic Composites with Different Polymers after Mechanical, Chemical and Physical Surface Treatment

Comparison of Adhesive Properties of Polyurethane Adhesive System and Wood-plastic Composites with Different Polymers after Mechanical, Chemical and Physical Surface Treatment

Long adhesive joints in façade applications exposed to wind suction

Study on Surface Treatments of Modified Wood Plastic Composite (WPC) to Improve Adhesion

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