scholarly journals Physical performance of particleboards using Castor oil-based adhesive

2018 ◽  
Vol 22 (10) ◽  
pp. 707-712 ◽  
Author(s):  
Luciano D. Varanda ◽  
Fábio M. Yamaji ◽  
Luís R. O. Santos ◽  
Diogo A. L. Silva ◽  
André L. Christoforo ◽  
...  
Keyword(s):  
Physical Properties ◽  
Physical Performance ◽  
Castor Oil ◽  
Pinus Elliottii ◽  
Melamine Formaldehyde ◽  
Oat Hulls ◽  
Wood Residues ◽  
Sustainable Materials ◽  
Forestry Residues ◽  
Rural Construction

ABSTRACT Reconstituted wood panels are widely used in various branches of the wood industry, such as in the furniture sectors and various segments of urban and rural construction. In Brazil, agricultural and forestry residues are abundantly generated, making feasible the study, development and application of alternative and sustainable materials, produced from the use of these wastes. The aim of this study was to produce high-density homogenous panels with wood residues of Pinus elliottii and oat hulls (Avena sativa), pressed with two types of adhesive, castor oil-based polyurethane and melamine formaldehyde, and to evaluate the physical performance of these panels. The physical performance of the panels was evaluated based on the ABNT NBR 14810: 2006, ANSI A208.1: 1999 and BS EN 312: 2003 standards. Analysis of variance (ANOVA) was performed to test the influence of the factors percentage of oat hull, percentage of adhesive and type of adhesive, and the interactions between these factors on the physical properties of the panels. The results indicated physical properties, in some treatments superior to the requirements stipulated by the consulted standards. It was concluded that the panels produced with the castor oil-based polyurethane adhesive showed better physical performance when compared with the panels produced with the melamine formaldehyde adhesive.

Tunable thermo-physical performance of castor oil-based polyurethanes with tailored release of coated fertilizers

2019 ◽  
Vol 210 ◽  
pp. 1207-1215 ◽  
Author(s):  
Dunsheng Liang ◽  
Qian Zhang ◽  
Wenbo Zhang ◽  
Lingxiao Liu ◽  
Haiyan Liang ◽  
...  
Keyword(s):  
Physical Performance ◽  
Castor Oil ◽  
Coated Fertilizers

Preparation of functionalized castor oil derivatives with tunable physical properties using heterogeneous acid and base catalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 50289-50297 ◽  
Author(s):  
Sivashunmugam Sankaranarayanan ◽  
Kannan Srinivasan
Keyword(s):  
Physical Properties ◽  
Castor Oil ◽  
Ring Opening ◽  
Heterogeneous Catalysts ◽  
Base Catalysts ◽  
Acid And Base ◽  
Oil Derivatives ◽  
Epoxidized Castor Oil

Functionalized castor oil derivatives are achieved from epoxidized castor oil through ring opening and transesterification reactions using heterogeneous catalysts.

scholarly journals PHYSICAL PROPERTIES OF MEDIA COMPOSED OF GROUND WHOLE PINE TREES AND THEIR EFFECTS ON VINCA (CATHARANTHUS ROSEUS) GROWTH

HortScience ◽  
2006 ◽  
Vol 41 (3) ◽  
pp. 510B-510
Author(s):  
Glenn B. Fain ◽  
Charles H. Gilliam
Keyword(s):  
Physical Properties ◽  
Loblolly Pine ◽  
Catharanthus Roseus ◽  
Plant Tissue ◽  
Pinus Palustris ◽  
Growth Index ◽  
Pinus Elliottii ◽  
Hammer Mill ◽  
Nutrient Analysis ◽  
Pine Trees

The objective of this study was to evaluate the potential use of container substrates composed of whole pine trees. Three species [loblolly pine (Pinus taeda), slash pine (Pinus elliottii) and longleaf pine (Pinus palustris)] of 8–10 year old pine trees were harvested at ground level and the entire tree was chipped with a tree chipper. The chips from each tree species were then further processed with a hammer mill to pass a ½-inch screen. On 29 June 2005 these three substrates along with 100% pinebark were mixed with the addition per cubic yard of 9.49 kg·m–3 Polyon 18–6–12 (18N–2.6P–10K), 2.97 kg·m–3 dolomitic lime and 0.89 kg·m–3 Micromax. One gallon (3.8 L) containers were then filled and placed into full sun under overhead irrigation. Into these containers were planted 72 cell plugs of Catharanthus roseus`Little Blanche'. Data collected were pre-plant chemical and physical properties of substrates, as well as plant growth index (GI), plant top dry weight, root ratings, and plant tissue (leaves) nutrient analysis at 60 days after planting (DAP). The test was repeated on 27 Aug. 2005 with C. roseus Raspberry Red Cooler. Top dry weights were on average 15% greater for the 100% pinebark substrate over all others at 60 DAP. However there were non differences in plant GI for any substrate at 60 DAP. There were no differences in plant tissue macro nutrient content for any substrate. Tissue micronutrient content was similar and within ranges reported by Mills and Jones (1996, Plant Analysis Handbook II) with the exception of Manganese. Manganese was highest for slash and loblolly pine and well over reported ranges. There were no differences in root ratings. There were no differences in substrate physical properties between the three whole tree substrates. However the 100% pinebark substrate had on average 50% less air space and 25% greater water holding capacity than the other substrates. Physical properties of all substrates were within recommended ranges. Based on the results of this study substrates composed of whole pine trees have potential as an alternative sustainable source for a substrate used in producing short term nursery crops.

scholarly journals Solid-State Microwave Synthesis of Melamine-Formaldehyde Resin

2009 ◽  
Vol 6 (1) ◽  
pp. 120-124 ◽  
Author(s):  
Subhash Bajia ◽  
Rashmi Sharma ◽  
Birbal Bajia
Keyword(s):  
Solid State ◽  
Physical Properties ◽  
Microwave Synthesis ◽  
Solid Support ◽  
Molar Ratio ◽  
Formaldehyde Resin ◽  
Efficient Synthesis ◽  
Melamine Formaldehyde ◽  
Melamine Formaldehyde Resin ◽  
Microwave Irradiations

An efficient synthesis of melamine-formaldehyde resin has been achieved using conventional as well as microwave irradiations (without and with solid support) in different molar ratio. Resin samples were tested for their chemical as well as physical properties. The structure of all the resin has been supported by their spectral data

scholarly journals Species comparison of the physical properties of loblolly and slash pine wood and bark

2017 ◽  
Vol 47 (11) ◽  
pp. 1495-1505 ◽  
Author(s):  
Thomas L. Eberhardt ◽  
Joseph Dahlen ◽  
Laurence Schimleck
Keyword(s):  
Physical Properties ◽  
Loblolly Pine ◽  
Pinus Elliottii ◽  
Dry Mass ◽  
Slash Pine ◽  
Species Comparison ◽  
Pine Wood ◽  
Living Tree ◽  
Breast Height ◽  
Whole Tree

Composition of the southern pine forest is now predominated by two species, loblolly pine (Pinus taeda L.) and slash pine (Pinus elliottii Engelm.), owing to fire suppression activities, natural regeneration on abandoned agricultural lands, and extensive planting. Comparison of the wood and bark physical properties of these pines is of interest in terms of the yields of usable biomass and, for the bark, its ecological functionality on a living tree. Trees from a species comparison study were used to generate wood and bark property data, on a whole-tree basis, and for stem disks collected at breast height. Models were constructed to explain the effect of relative height on wood and bark properties. When comparing the whole-tree data, slash pine wood (0.523 versus 0.498) and bark (0.368 versus 0.311) specific gravity values were higher, both offset by lower moisture contents; slash pine also produced a higher percentage of bark on a dry-mass basis (17% versus 12.5%). Unlike wood properties, bark properties showed significant between-species differences when determined at breast height alone, the exception being moisture content. In terms of yield, harvests of a green tonne of loblolly pine and slash pine would give approximately the same dry mass of wood, but slash pine provides more bark.

Possibilities of affecting the chemical resistances of the coatings formed by reaction of amino resins with alkyd resins

2002 ◽  
Vol 31 (1) ◽  
pp. 27-32 ◽  
Author(s):  
P. Kalenda ◽  
A. Kalendová
Keyword(s):  
Chemical Stability ◽  
Alkyd Resin ◽  
Castor Oil ◽  
Film Formation ◽  
Urea Formaldehyde ◽  
Melamine Formaldehyde ◽  
Coating Films ◽  
Alkyd Resins ◽  
Solid Films

The paper deals with the mode of film formation from urea–formaldehyde and melamine–formaldehyde resins combined with alkyd resin based on castor oil‐modified alkyd. The properties of hardened coatings (such as hardness, chemical stability, and adhesion to substrate) were followed in dependence on the ratios of reaction components. An apparatus was built for measuring the formaldehyde emissions escaping from the solid coating films. The determination was performed by the pararosaniline method. The addition of imidazolidine in a concentration up to 10 per cent can reduce the emissions of formaldehyde escaping from the solid films to a considerable amount.

scholarly journals EMBALAGENS CARTONADAS COMO MATÉRIA-PRIMA NA FABRICAÇÃO DE COMPÓSITOS

Nativa ◽  
2018 ◽  
Vol 6 (2) ◽  
pp. 177
Author(s):  
Talita Baldin ◽  
Maiara Talgatti ◽  
Amanda Grassamann da Silveira ◽  
Bruna Gabrieli Resner ◽  
Elio José Santini
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Internal Bond ◽  
Urea Formaldehyde ◽  
Eucalyptus Grandis ◽  
Raw Material ◽  
Thickness Swelling ◽  
Wood Particles ◽  
Sustainable Materials ◽  
Waste Particles

O objetivo do presente trabalho foi avaliar o potencial de uso de partículas de resíduos de embalagens cartonadas e partículas de Eucalyptus grandis para a fabricação de compósitos, colados com adesivo à base de ureia-formaldeído. Foram utilizadas cinco diferentes proporções de madeira de E. grandis e embalagens cartonadas. As partículas de madeira e embalagens cartonadas foram produzidas em laboratório. A avaliação da qualidade dos compósitos envolveu a caracterização da geometria das partículas, das propriedades físicas: massa específica básica, teor de umidade de equilíbrio, absorção de água e inchamento em espessura após 2 e 24 horas de imersão em água e das propriedades mecânicas: flexão estática (MOE e MOR), resistência ao arrancamento de parafuso, ligação interna e dureza Janka. A incorporação de partículas de embalagens cartonadas proporcionou uma melhoria nas propriedades físicas em relação aos compósitos puros de madeira. Já para as propriedades mecânicas, compósitos com até 50% de embalagens cartonadas obtiveram melhores resultados, no entanto, a incorporação a partir de 75% ocasionou decadência nessas propriedades. Compósitos de madeira de E. grandis e embalagens cartonadas apresentaram potencial para utilização em ambientes internos e podem ser uma alternativa para a produção de compósitos sustentáveis e de boa qualidade.Palavra-chave: materiais sustentáveis, propriedades físicas e mecânicas, ureia-formaldeído. CARTONBOARD PACKAGING AS A RAW MATERIAL IN THE MANUFACTURE OF COMPOSITES ABSTRACT:The aim of this study was to evaluate the potential waste particles use of carton packaging and particles of E. grandis for the manufacture of particle boards, bonded with urea-formaldehyde-based adhesive. Five different proportions of E. grandis wood and cartons have been used. The wood particles and cartons were produced in the laboratory. The quality assessment panels involved characterizing the geometry of the particles, the physical properties: specific gravity, equilibrium moisture content, water absorption and thickness swelling after 2 and 24 hours of immersion in water and mechanical properties: flexural static (MOR and MOE), resistance to screw pullout, internal bond and Janka hardness. The incorporation of particulate cartons provided an improvement in physical properties relative to pure wood panels. As for the mechanical properties, panels of up to 50 % of cartons obtained best results, however, incorporating from 75 % decay caused these properties. The wood particleboard of E. grandis and cartons showed potential for use indoors and become an alternative for producing sustainable panels and of good quality.Keywords: sustainable materials, physical-mechanical properties; urea-formaldehyde. DOI:

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