A no-aldehyde emission hardener for tannin-based wood adhesives for exterior panels

Trosa, A.; Pizzi, A.

doi:10.1007/s001070100200

Cited by 66 publications

(38 citation statements)

References 5 publications

(12 reference statements)

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“…Accordingly, when the press temperature is increased, the surface of the particleboards tends to suffer from thermal degradation, because curing has already taken place. The particleboard made using the wattle tannin-based adhesive with paraformaldehyde showed the best physical properties, while hexamine was the best hardener for pine tannin, as these adhesive systems were investigated in several studies [10,11,17]. From Fig.…”

Section: Physical Propertiesmentioning

confidence: 99%

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Physico-mechanical properties of particleboards bonded with pine and wattle tannin-based adhesives

Kim¹,

Lee²,

Kim³

et al. 2003

Journal of Adhesion Science and Technology

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This study investigated the physical and mechanical properties of particleboards made using two types of tannin-based adhesives, wattle and pine, with three hardeners, paraformaldehyde, hexamethylenetetramine(hexamine) and TN (tris(hydroxyl)nitromethane), by measuring the physical (thickness swelling, linear expansion and water absorption) and mechanical properties (bending strength and internal bond strength). The performance of the particleboards made using tannin-based adhesives was in uenced by physical conditions such as press time and temperature as well as by chemical conditions, such as the chemical structure of the tannin and the hardener. Wattle tannin-based adhesive being a thermoset, the wattle tannin-based particleboards were more in uenced by physical conditions, while the pine tannin-based particleboards were in uenced by the chemical structure of the pine tannin nuclei, which include phloroglucinolic A-rings. The reactivity of the hardener toward the tannin was in the order: paraformaldehyde > hexamine > TN for wattle tannin, while for pine tannin the order was hexamine > paraformaldehyde > TN.

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Section: Physical Propertiesmentioning

confidence: 99%

“…To these solutions, 6.5, 8 and 10 wt% of each hardener, by weight of dry tannin extract, were added. Each hardener concentration was based on several results [10][11][12]. The pH ranged from 5.5 to 6.…”

Section: Tannin-based Adhesivesmentioning

confidence: 99%

Physico-mechanical properties of particleboards bonded with pine and wattle tannin-based adhesives

Kim¹,

Lee²,

Kim³

et al. 2003

Journal of Adhesion Science and Technology

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“…Therefore, it is reasonable to assume that similar adhesive systems could be used for bonding medium density berboards (MDF). Researchers have described the application of other tannin adhesives for industrial MDF and particleboard manufacture; for example, Roffael et al [2] employed quebracho and wattle tannin adhesives for the production of particleboards and MDF in Germany, and Trosa and Pizzi [3] prepared MDF and particleboards with quebracho tannin adhesives.…”

Section: Introductionmentioning

confidence: 98%

Effects of Pinus pinaster bark extracts content on the cure properties of tannin-modified adhesives and on bonding of exterior grade MDF

López-Suevos¹,

Riedl²

2003

Journal of Adhesion Science and Technology

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Phenol-urea-formaldehyde-tannin (PUFT) adhesives with different degrees of phenol substitution by Pinus pinaster bark tannins were thermally characterized by dynamic mechanical thermal analysis (DMTA) and by differential scanning calorimetry (DSC). They were employed to prepare exterior grade Medium Density Fiberboards (MDF) according to European Standards. DMTA and DSC experiments showed, rst, that the tannin-modi ed adhesives hardened in the low temperature range (30-110 ± C) and, second, that increasing the tannin content of the adhesives reduced the curing temperature, obtaining at least the same mechanical strength (stiffness) and higher curing enthalpies (1H ) than the commercial phenolic resin. Although only the MDF boards made using the lowest viscosity tannin-modi ed adhesive (PUFT-10), with a 44% phenol replacement by tannin, met the outdoor requirements, all the other tannin-modi ed adhesives boards met the interior grade speci cations. Among the board properties evaluated, the low value of thickness swelling after 24-h water immersion of MDF boards prepared using the PUFT-10 (6.6%) is particularly noticeable, which means an improvement of almost 50% compared to that of the commercial PF (12.6%).

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“…This has centered on two lines of investigation: (i) the use of hardeners not emitting at all simply because either no aldehyde has been added to the tannin, or because the aldehyde cannot be liberated from the system, and (ii) tannin autocondensation. Methylolated nitroparaffins, such and in particular the simpler and least expensive exponent of their class, namely trishydroxymethyl nitromethane (Trosa and Pizzi 2001), belong to the first class. They function well, but they are too expensive.…”

Section: Tannin Adhesivesmentioning

confidence: 99%

Wood products and green chemistry

Pizzi

2016

Annals of Forest Science

161

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& Key message Green chemistry for and from wood has developed numerous industrial products, namely biosourced, green wood adhesives and preservatives, foams, composite matrices, laminates, hard and flexible plastics, flexible films, and abrasive grinding discs, and their number is still growing. & Introduction This review addresses (1) the elimination of toxic aldehydes from the most common wood panel adhesive, the one based on urea, itself a natural product, (2) biosourced adhesives derived from wood or other vegetable matter and used for wood products, and (3) wood and bark tannin-based foams, natural fiber composites using tannin matrices, paper surface laminates and continuous high-pressure paper laminates using tannin-furanics, hard plastics based on tanninfuranic materials and some of their applications, flexible biosourced tannin-furanic films, and biosourced wood preservatives.

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A no-aldehyde emission hardener for tannin-based wood adhesives for exterior panels

Cited by 66 publications

References 5 publications

Physico-mechanical properties of particleboards bonded with pine and wattle tannin-based adhesives

Physico-mechanical properties of particleboards bonded with pine and wattle tannin-based adhesives

Effects of Pinus pinaster bark extracts content on the cure properties of tannin-modified adhesives and on bonding of exterior grade MDF

Wood products and green chemistry

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