On the Feasibility of a pMDI-Reduced Production of Wood Fiber Insulation Boards by Means of Kraft Lignin and Ligneous Canola Hulls

Abstract

The thermal insulation of buildings using wood fiber insulation boards (WFIBs) constitutes a positive contribution towards climate change. Thereby, the bonding of wood fibers using mainly petrochemical-based resins such as polymeric diphenylmethane diisocyanate (pMDI) is an important measure to meet required board properties. Still there is a need to reduce or partial substitute the amount of these kinds of resins in favor of a greener product. This study therefore focusses on the feasibility of reducing the amount of pMDI by 50% through the addition of 1% BioPiva 395 or Indulin as two types of softwood Kraft-Lignin and lignin rich canola hulls together with propylene carbonate as a diluent. A panel density of 160 kg/m3 and a thickness of 40 mm was aimed. The curing of these modified pMDI was investigated by using two types of techniques: hot-steam (HS) and innovative hot-air/hot-steam-process (HA/HS). The WFIBs were then tested on their physical-mechanical properties. The equilibrium moisture content (EMC) was determined at two different climates. An exemplary investigation of thermal conductivity was conducted as well. The WFIBs did undergo a further chemically based analysis towards extractives content and elemental (C, N) composition. The results show that it is feasible to produce WFIBs with lower quantities of pMDI resin and added lignin with enhanced physical-mechanical board properties, which were lacking no disadvantages towards thermal conductivity or behavior towards moisture, especially when cured via HA/HS-process.

Environmentally sustainable, high-performance lignin-derived universal adhesive

“…S5, † for more details of material dimensions). 51 Prior to the IBS measurement, the adhesive samples were dried at 105 ± 2 °C for 2 h. Different substrates such as G, SS, PC, and Al were used for IBS samples (50 mm × 50 mm, except Al) and were glued between two Al yokes (for Al-IBS, the sample was used directly without fixing with yokes). The fixed samples were tested using a universal testing device (Zwick Roell, Ulm, Germany).…”

Canola Protein Wood Adhesive with Improved Bonding properties

“…Despites its high availability and its potential suitability for the development of bio-adhesives (Tene Tayo et al, 2022), canola protein has so far been given less attention compared to other plant proteins such as soy and wheat. As result, very little research works have been carried out on canola protein isolates (Li et al, 2012a(Li et al, , 2017Hale, 2013;Wang et al, 2014;Bandara et al, 2017), canola our (Yang et al, 2010(Yang et al, , 2011(Yang et al, , 2012(Yang et al, , 2014Ostendorf et al, 2021aOstendorf et al, , 2021bTene Tayo et al, 2022) or canola oil (Kong et al, 2011), leaving a great gap to cover. Moreover, in most of these research works, synthetic resins were used as crosslinker to increase the physical-mechanical properties of the developed canola-based adhesive.…”

Enzymatic Oxidation of Ca-Lignosulfonate and Kraft Lignin in Different Lignin-Laccase-Mediator-Systems and MDF Production

“…Because they are available in large quantities, lignosulfonates and kraft lignin are most interesting polyphenols for the development of binders for wood composites. Due to the high content of phenolic groups, both technical lignins are considered to be very suitable green substitutes in existing binder systems (Mansouri et al, 2007;Tejado et al, 2007;Norström et al, 2018;Jiang et al, 2020;Wang et al, 2020;Aristri et al, 2021;Karthäuser et al, 2021;Kumar et al, 2021;Ostendorf et al, 2021). Nonetheless, extensive research is required before a successful industrial implication.…”