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

López-Suevos, Francisco; Riedl, Bernard

doi:10.1163/156856103769207374

Cited by 29 publications

(9 citation statements)

References 22 publications

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“…Tannins can be used as adhesives alone (with a formaldehyde component as crosslinker) or in combination with aminoplastic or phenolic resins. MDF produced with tannins replacing parts of phenol in phenol-ureaformaldehyde resins or even with 100% tannin resin can meet interior grade requirements but usually not exterior grade specifications (Roffael et al 2000, López-Suevos andRiedl 2003). Different tannin sources and time of tannin addition in the process chain of MDF production (e.g.…”

Section: Tanninsmentioning

confidence: 99%

Sustainable Bio-Based Adhesives for Eco-Friendly Wood Composites a Review

Antov¹,

Savov²,

Neykov³

2020

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The aim of the present review is to summarize the current state of research in the field of sustainable bio-based adhesives used for production of eco-friendly wood composite materials. The article is focused mainly on the use of lignin, starch and tannins as raw materials and alternatives to the existing conventional adhesives. It is expected that increased amounts of biobased adhesives will be used in the production of wood composites in order to meet the current needs for development of sustainable and innovative materials which will make the wood-based panel industry more sustainable and lower its dependence on fossil fuels. However, there are still substantial challenges for the complete replacement of petroleum-based wood adhesives with biobased adhesives, mainly because of their relatively poor water resistance, low bonding strength and large natural variations due to different growing conditions. In this respect, fundamental research is still need in order to determine the factors for formulating bio-based adhesives with optimal properties and broaden their application in wood-based panel industry.

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Section: Tanninsmentioning

confidence: 99%

Sustainable Bio-Based Adhesives for Eco-Friendly Wood Composites a Review

Antov¹,

Savov²,

Neykov³

2020

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“…The modification of tannin with formaldehyde is usually employed to obtain an extensive amount of products usually employed as glues in the wood industries,14–25 in the production of flocculating agents,26 to prepare ion‐exchange resins,27–29 to tan leather,30, 31 and so on 32, 33. Numerous articles are known on the applications of these polymers, but very few studies are reported concerning the composition and structure of the products obtained.…”

Section: Resultsmentioning

confidence: 99%

Hide tanning with modified natural tannins

Tambi¹,

Frediani²,

Frediani³

et al. 2008

J of Applied Polymer Sci

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Tannin from ''Acacia Mearnsii'' usually called Mimosa, is largely employed in vegetal tanning of hide even if the quality of the leather is poorer than that obtained using chromium as tanning agents. However, taking into account the natural resources of this product and its reduced environmental impact, mimosa tannin has been modified to obtain leather having improved properties. Tannin was modified using formaldehyde, urea, a sulfonic acid and a sulfiting agent: The new products show a higher molecular weight than mimosa tannin but maintain a good solubility in water. Modified tannins were characterized through physicochemical and technological tests and evaluated as tanning agents. The properties of tanned leathers obtained using the new tannin products and mimosa were compared. Some of the polymers containing phenolsulfonic acid are good tannin agents, especially those with a suitable molecular weight. The technological and sensorial properties of the leather obtained using modified tannins (distension and strength of grain, tensile strength, elongation, and tear load) are better than those obtained using mimosa when an appropriate ratio of the reagents were employed. At the same time the feeling of the tanned leather was improved and the final products show fullness, elasticity, fluency, reactivity, and a thin and fine grain. Some of the tannins modified with naphtalensulfonic acid show poor tanning properties but good penetration in the leather suggesting their use as auxiliary sintans in the pretanning process. A simple procedure to prepare these modified tanning agents in the course of the tannin extraction is suggested.

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“…Lignins are phenolic materials, are abundant, and of low cost, but they have lower reactivity towards formaldehyde, or other aldehydes, than even phenol. Extensive reviews on a number of proposed technologies of formulation and application do exist, and the reader is referred to these in earnest (Nimz 1983;Newman and Glasser 1985;Gardner and Sellers 1986;Shimatani et al 1994;Calvé 1999;Viikari et al 1999;Blanchet et al 2000;Kim and Kim 2003;Lopez-Suevos and Riedl 2003). This field is however remarkable for how small has been the industrial success in using these materials.…”

Section: Lignin Adhesivesmentioning

confidence: 99%

Wood products and green chemistry

Pizzi

2016

Annals of Forest Science

147

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

Cited by 29 publications

References 22 publications

Sustainable Bio-Based Adhesives for Eco-Friendly Wood Composites a Review

Sustainable Bio-Based Adhesives for Eco-Friendly Wood Composites a Review

Hide tanning with modified natural tannins

Wood products and green chemistry

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