Adhesive developments in forest products

Chow, S.

doi:10.1007/bf00351828

Cited by 17 publications

(20 citation statements)

References 9 publications

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“…Natural tannin-based adhesives for wood composites have been commercially available for several decades and, especially, the antimicrobial role of tannins has been exploited in the wood composite industry and adhesives (Chow, 1977;Pizzi, 1982;Li and Maplesden, 1998). Building materials such as plywood, other laminated veneer products, fibreboard and fibreglass insulation are major uses of adhesives (Lu and Shi, 1995).…”

Section: Use Toxicology and Safety Aspects Of Tanninsmentioning

confidence: 99%

Tannins and Tannin Agents

Julkunen‐Tiitto

Häggman

2009

Handbook of Natural Colorants

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Section: Use Toxicology and Safety Aspects Of Tanninsmentioning

confidence: 99%

Tannins and Tannin Agents

Julkunen‐Tiitto

Häggman

2009

Handbook of Natural Colorants

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“…Chow (1983) menciona que estas substâncias, por serem oriundas de derivados de petróleo, elevam o custo da resina e, consequentemente, o custo total dos painéis. Após a crise do petróleo, houve, então, uma grande preocupação em substituir estes derivados petroquímicos na indústria de painéis de madeira (CHOW, 1983;PIZZI;MITTAL, 1994). Outro motivo para a substituição de resinas comerciais por resinas naturais é devido ao problema da emissão de substâncias tóxicas (formaldeído) para a atmosfera, como apresentado por Margosian (1990) e Gonçalves et al (2008).…”

Section: Introductionunclassified

Produção de painéis compensados com resina fenólica e melamínica sem formaldeído

Cunha

Rios

Stüpp

et al. 2017

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ResumoO objetivo desta pesquisa foi avaliar o potencial técnico de duas resinas sem formaldeído para a produção de compensados laminados para ambiente interno e externo não abrigado. Para tanto, as resinas foram comparadas com as tradicionalmente utilizadas pelo setor. O plano experimental foi composto por 05 tratamentos, sendo: com resina fenol sem formaldeído (T1) e com formaldeído (T2), com resina melamina uréia com formaldeído (T3) e sem formaldeído (T4), e com resina uréia formaldeído (T5). Foram produzidos painéis compensados laminados de Pinus taeda com 07 lâminas de 2,7 mm de espessura, com composição do adesivo e parâmetros de processo conforme recomendado pelos fabricantes das resinas. Observou-se que para ambiente externo não abrigado, a resina melamínica uréia sem formaldeído demonstrou potencial de utilização; já a resina fenólica sem formaldeído (em pó) apresentou resultados pouco expressivos, principalmente na avaliação da qualidade da colagem. Para ambiente interno, a resina melamínica uréia sem formaldeído se apresentou como potencial em termos de propriedades tecnológicas para substituição da uréia formaldeído. Palavras-chave: Painéis de madeira industrializada; resinas sem formaldeído; propriedades tecnológicas. AbstractProduction of plywood with phenolic and melamine resin without formaldehyde. The objective of this research was to evaluate the technical potential of two adhesives without formaldehyde for the production of plywood for internal and external not sheltered environment. Therefore, the resins were compared with those traditionally used by the industry. The experimental plan consisted of 05 treatments: phenol resin without formaldehyde (T1) and with formaldehyde (T2), melamine urea with (T3) and without formaldehyde (T4), and urea formaldehyde resin (T5). Plywood laminate panels of Pinus taeda were produced with 07 veneers of 2.7 mm thickness, with the adhesive composition and process parameters as recommended by the resin manufacturers. It was observed that external environment not sheltered, the urea melamine resin without formaldehyde has shown potential for use; since the phenolic resin without formaldehyde (powder) showed poor results, especially in the bonding quality. For indoors, the resin melamine urea formaldehyde-free introduced himself as a potential in terms of technological properties for replacement of urea formaldehyde. Keywords: Wood panels; resins without formaldehyde; technological properties. INTRODUÇÃOO compensado é um painel feito de lâminas de madeira coladas entre si, com as fibras de cada lâmina orientadas perpendicularmente em relação à adjacente. Utiliza-se um número ímpar de lâminas, sendo mais comuns, painéis compostos por 3, 5, 7 ou 9 camadas (TSOUMIS, 1991). Fatores como, espécie de madeira, resina, teor de umidade, quantidade de lenho tardio nas lâminas, pressão e temperatura, utilizados na fabricação dos painéis influenciam diretamente nas propriedades dos painéis (KOLLMANN et al., 1975).O início da produção industrial desses painéis no mundo se deu...

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“…Liu and Gao 21 also found that the isothermal cure reaction of a boron-containing PF resin followed an autocatalytic reaction mechanism, and the kinetic parameters were derived. In general, the cure of PF resin can be influenced by the interactions between resin and wood, 2,13,15,17,22,23 as well as those between resin and inorganic or organic additives. Understanding these interactions is fundamental to improve the productivity and physical properties of wood-based panels.…”

Section: Introductionmentioning

confidence: 99%

“…This technique has been widely used to analyze the cure process of the thermosetting polymers, including epoxy resins, [3][4][5][6][7][8][9][10] isocyanate resins, 11,12 and PF. 2,[13][14][15][16][17][18][19][20] Although there are quite a few reports about the cure kinetics of PF resins, studied by DSC, most of the research treated the cure reaction of PF resins simply as an nth-order reaction and studied the effect of other ingredients on the cure processes by dynamic DSC. Among the studies reported, a kinetic study of the polymerization of PF resin in the presence of cellulosic materials was carried out by Chow, 13 using DSC.…”

Section: Introductionmentioning

confidence: 99%

“…2,[13][14][15][16][17][18][19][20] Although there are quite a few reports about the cure kinetics of PF resins, studied by DSC, most of the research treated the cure reaction of PF resins simply as an nth-order reaction and studied the effect of other ingredients on the cure processes by dynamic DSC. Among the studies reported, a kinetic study of the polymerization of PF resin in the presence of cellulosic materials was carried out by Chow, 13 using DSC. Mizumachi and Morita 15 obtained the activation energy of the curing reaction of phenolic resin in the presence of wood.…”

Section: Introductionmentioning

confidence: 99%

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Cure kinetics of aqueous phenol–formaldehyde resins used for oriented strandboard manufacturing: Analytical technique

Lei

Lian

2006

J of Applied Polymer Sci

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ABSTRACT:The cure kinetics of commercial phenolformaldehyde (PF), used as oriented strandboard face and core resins, were studied using isothermal and dynamic differential scanning calorimetry (DSC). The cure of the face resin completely followed an nth-order reaction mechanism. The reaction order was nearly 1 with activation energy of 79.29 kJ mol Ϫ1 . The core resin showed a more complicated cure mechanism, including both nth-order and autocatalytic reactions. The nth-order part, with reaction order of 2.38, began at lower temperatures, but the reaction rate of the autocatalytic part increased much faster with increase in curing temperature. The total reaction order for the autocatalytic part was about 5. Cure kinetic models, for both face and core resins, were developed. It is shown that the models fitted experimental data well, and that the isothermal DSC was much more reliable than the dynamic DSC in studying the cure kinetics. Furthermore, the relationships among cure reaction conversion (curing degree), cure temperature, and cure time were predicted for both resin systems.

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Adhesive developments in forest products

Cited by 17 publications

References 9 publications

Tannins and Tannin Agents

Tannins and Tannin Agents

Produção de painéis compensados com resina fenólica e melamínica sem formaldeído

Cure kinetics of aqueous phenol–formaldehyde resins used for oriented strandboard manufacturing: Analytical technique

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