Analytik und Prüfverfahren für Bindemittel und Holzwerkstoffe

Dunky, Manfred; Niemz, Peter

doi:10.1007/978-3-642-55938-9_8

Cited by 1 publication

(3 citation statements)

References 261 publications

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“…Regarding the gel time at 105 °C, there was an accelerated curing or rather coagulation of the albumin adhesives when adding 1% or 2% of hydrophobic agent from 79.8 s (A 1) to 76.5 s (A 2) or 67.5 s (A 3). The UF resin took the longest time for curing with 171.2 s, whereas the gel time of the pure pMDI was not measureable due to the fact that the curing reaction is initialized by the presence of active hydrogen (Dunky 2002). The solid contents of the used albumin glues were 57.8% (A 1), 52.6% (A 2), and 49.9% (A 3).…”

Section: Adhesive Analysismentioning

confidence: 99%

“…On the other hand, the viscosity was increased, which still allowed an easy handling, especially a good sprayability of the adhesives. The adjustment of the viscosity was a sensitive measure because of the wettability onto wood together with a penetration into wood (Dunky 2002). Cheftel et al (1992) observed an increased viscosity with alkalization due to a partial protein unfolding.…”

Section: Adhesive Analysismentioning

confidence: 99%

“…Regarding formaldehyde emission of UF-bonded MDF, the low emitting potential can be explained by the low molar F/U ratio. By reducing formaldehyde content in the UF, the emission level naturally decreased but is also negatively affecting mechanical properties (Dunky 2002).…”

Section: Uf-refmentioning

confidence: 99%

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Manufacturing medium-density fiberboards and wood fiber insulation boards using a blood albumin adhesive on a pilot scale

Ostendorf

Reuter

Euring

2020

BioRes

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An albumin adhesive derived from animal blood was used for the first time for the production of two kinds of fiberboard in a dry process: medium-density fiberboard (MDF) and wood fiber insulation board (WFI). Additionally, the curing for WFI was completed using an innovative hot-air/hot-steam (HA/HS) process. There is a general importance to develop alternatives to substitute common binding agents, such as urea-formaldehyde (UF) or polymeric methylene diphenylene diisocyanate (pMDI) resins, and to develop value-added opportunities for such waste material from slaughterhouses. An adhesive analysis was performed to understand the curing reaction of these protein adhesives, which showed good properties in regards to viscosity or gel time. The physical-mechanical results showed on the one hand that the albumin adhesive could compete with UF-bonded MDF regarding tensile strength and modulus of rupture in conformity to the European Standard, but it failed to meet requirements for thickness swelling. The albumin adhesive also can compete with pMDI bonded WFI regarding tensile and compression strength, but it showed non-viable results for short-term water absorption.

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Section: Adhesive Analysismentioning

confidence: 99%

Section: Adhesive Analysismentioning

confidence: 99%